20-F

As filed with the Securities and Exchange Commission on April 30, 2018

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 20-F

(Mark One)

☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2017

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of event requiring this shell company report                     

Commission file number 001-31811

Woori Bank

(Exact name of Registrant as specified in its charter)

Woori Bank

(Translation of Registrant’s name into English)

The Republic of Korea

(Jurisdiction of incorporation or organization)

51, Sogong-ro, Jung-gu, Seoul 04632, Korea

(Address of principal executive offices)

Jeong Soo Lee

51, Sogong-ro, Jung-gu, Seoul 04632, Korea

Telephone No.: +82-2-2125-2110

Facsimile No.: +82-2-0505002-3080

(Name, telephone, e-mail and/or facsimile number and address of company contact person)

Securities registered or to be registered pursuant to Section 12(b) of the Act.

Title of each class	Name of each exchange on which registered
American Depositary Shares, each representing three shares of Common Stock	New York Stock Exchange
Common Stock, par value ￦5,000 per share	New York Stock Exchange*

Securities registered or to be registered pursuant to Section 12(g) of the Act:

None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act:

None

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report.

673,271,226 shares of Common Stock, par value ￦5,000 per share

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    ☒  Yes    ☐  No

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.    ☐  Yes    ☒  No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    ☒  Yes    ☐  No

Indicate by check mark whether the registrant has submitted electronically and posted on its Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    ☒  Yes    ☐  No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

☒    Large accelerated filer ☐    Accelerated Filer ☐    Non-accelerated filer ☐    Emerging growth company

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 13(a) of the Exchange Act.    ☐

† The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

☐    U.S. GAAP ☒    International Financial Reporting Standards as issued by the International Accounting Standards Board ☐    Other

If “other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.    ☐  Item 17    ☐  Item 18

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    ☐  Yes    ☒  No

(APPLICABLE ONLY TO ISSUERS INVOLVED IN BANKRUPTCY PROCEEDINGS DURING THE PAST FIVE YEARS)

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Sections 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.    ☐  Yes    ☐  No

* Not for trading, but only in connection with the registration of the American Depositary Shares.

TABLE OF CONTENTS

			Page
Presentation of Financial and Other Information				1
Forward-Looking Statements				2
Item  1.	Identity of Directors, Senior Management and Advisers			3
Item 2.	Offer Statistics and Expected Timetable			3
Item  3.	Key Information			3
	Item 3.A.	Selected Financial Data		3
	Item 3.B.	Capitalization and Indebtedness		10
	Item 3.C.	Reasons for the Offer and Use of Proceeds		10
	Item 3.D.	Risk Factors		10
Item 4.	Information on the Company			34
	Item 4.A.	History and Development of the Company		34
	Item 4.B.	Business Overview		40
	Item 4.C.	Organizational Structure		107
	Item 4.D.	Property, Plants and Equipment		108
Item 4A.	Unresolved Staff Comments			108
Item 5.	Operating and Financial Review and Prospects			109
	Item 5.A.	Operating Results		109
	Item 5.B.	Liquidity and Capital Resources		140
	Item 5.C.	Research and Development, Patents and Licenses, etc.		146
	Item 5.D.	Trend Information		146
	Item 5.E.	Off-Balance Sheet Arrangements		146
	Item 5.F.	Tabular Disclosure of Contractual Obligations		146
	Item 5.G.	Safe Harbor		146
Item 6.	Directors, Senior Management and Employees			146
	Item 6.A.	Directors and Senior Management		146
	Item 6.B.	Compensation		151
	Item 6.C.	Board Practices		151
	Item 6.D.	Employees		153
	Item 6.E.	Share Ownership		154
Item 7.	Major Shareholders and Related Party Transactions			155
	Item 7.A.	Major Shareholders		155
	Item 7.B.	Related Party Transactions		156
	Item 7.C.	Interest of Experts and Counsel		156
Item 8.	Financial Information			156
	Item 8.A.	Consolidated Statements and Other Financial Information		156
	Item 8.B.	Significant Changes		157
Item 9.	The Offer and Listing			157
	Item 9.A.	Offering and Listing Details		157
	Item 9.B.	Plan of Distribution		158
	Item 9.C.	Markets		158
	Item 9.D.	Selling Shareholders		165
	Item 9.E.	Dilution		165
	Item 9.F.	Expenses of the Issuer		165
Item 10.	Additional Information			166
	Item 10.A.	Share Capital		166
	Item 10.B.	Memorandum and Articles of Association		166
	Item 10.C.	Material Contracts		172
	Item 10.D.	Exchange Controls		173
	Item 10.E.	Taxation		174

i

			Page
	Item 10.F.	Dividends and Paying Agents		179
	Item 10.G.	Statements by Experts		179
	Item 10.H.	Documents on Display		179
	Item 10.I.	Subsidiary Information		179
Item 11.	Quantitative and Qualitative Disclosures about Market Risk			180
Item 12.	Description of Securities Other Than Equity Securities			202
Item 13.	Defaults, Dividend Arrearages and Delinquencies			203
Item 14.	Material Modifications to the Rights of Security Holders and Use of Proceeds			203
Item 15.	Controls and Procedures			203
Item 16.	Reserved			204
Item 16A.	Audit Committee Financial Expert			204
Item 16B.	Code of Ethics			204
Item 16C.	Principal Accountant Fees and Services			204
Item 16D.	Exemptions from the Listing Standards for Audit Committees			205
Item 16E.	Purchase of Equity Securities by the Issuer and Affiliated Purchasers			205
Item 16F.	Change in Registrant’s Certifying Accountant			205
Item 16G.	Corporate Governance			205
Item 16H.	Mine Safety Disclosure			207
Item 17.	Financial Statements			207
Item 18.	Financial Statements			207
Item 19.	Exhibits			208

ii

PRESENTATION OF FINANCIAL AND OTHER INFORMATION

The financial statements included in this annual report are prepared in accordance with International Financial Reporting Standards, or IFRS, as issued by the International Accounting Standards Board, or IASB.

Unless expressly stated otherwise, all financial data included in this annual report are presented on a consolidated basis.

In this annual report:

• unless otherwise indicated or required by the context, “we,” “us,” “our” and similar terms refer to Woori Bank and its subsidiaries and, for periods prior to the merger of Woori Finance Holdings Co., Ltd. with and into Woori Bank in November 2014, refer to Woori Finance Holdings and its subsidiaries for such periods (including Woori Bank), but excluding those accounted for as discontinued operations;

• references to “Korea” are to the Republic of Korea;

• references to the “government” are to the government of the Republic of Korea;

• references to “Won” or “￦” are to the currency of Korea;

• references to “U.S. dollars,” “$” or “US$” are to the currency of the United States; and

• references to “Euros” or “EUR” are to the currency of the European Economic and Monetary Union.

Discrepancies between totals and the sums of the amounts contained in any table may be a result of rounding.

For your convenience, this annual report contains conversions of Won amounts into U.S. dollars at the noon buying rate of the Federal Reserve Bank of New York for Won in effect on December 31, 2017, which was ￦1,067.4 = US$1.00.

1

FORWARD-LOOKING STATEMENTS

The U.S. Securities and Exchange Commission encourages companies to disclose forward-looking information so that investors can better understand a company’s future prospects and make informed investment decisions. This annual report contains forward-looking statements.

Words and phrases such as “aim,” “anticipate,” “assume,” “believe,” “contemplate,” “continue,” “estimate,” “expect,” “future,” “goal,” “intend,” “may,” “objective,” “plan,” “positioned,” “predict,” “project,” “risk,” “seek to,” “shall,” “should,” “will likely result,” “will pursue” and words and terms of similar substance used in connection with any discussion of future operating or financial performance or our expectations, plans, projections or business prospects identify forward-looking statements. In particular, the statements under the headings “Item 3.D. Risk Factors,” “Item 4.B. Business Overview” and “Item 5. Operating and Financial Review and Prospects” regarding our financial condition and other future events or prospects are forward-looking statements. All forward-looking statements are management’s present expectations of future events and are subject to a number of factors and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements.

In addition to the risks related to our business discussed under “Item 3.D. Risk Factors,” other factors could cause actual results to differ materially from those described in the forward-looking statements. These factors include, but are not limited to:

• a change or delay in, or cancellation of, the Korean government’s privatization plan with respect to us;

• our ability to successfully implement our strategy;

• future levels of non-performing loans;

• our growth and expansion;

• the adequacy of allowances for credit and other losses;

• technological changes;

• interest rates;

• investment income;

• availability of funding and liquidity;

• our exposure to market risks; and

• adverse market and regulatory conditions.

By their nature, certain disclosures relating to these and other risks are only estimates and could be materially different from what actually occurs in the future. As a result, actual future gains, losses or impact on our income or results of operations could materially differ from those that have been estimated. For example, revenues could decrease, costs could increase, capital costs could increase, capital investment could be delayed and anticipated improvements in performance might not be fully realized.

In addition, other factors that could cause actual results to differ materially from those estimated by the forward-looking statements contained in this annual report could include, but are not limited to:

• general economic and political conditions in Korea or other countries that have an impact on our business activities or investments;

• the monetary and interest rate policies of Korea;

• inflation or deflation;

• unanticipated volatility in interest rates;

• foreign exchange rates;

2

• prices and yields of equity and debt securities;

• the performance of the financial markets in Korea and globally;

• changes in domestic and foreign laws, regulations and taxes;

• changes in competition and the pricing environment in Korea; and

• regional or general changes in asset valuations.

For further discussion of the factors that could cause actual results to differ, see the discussion under “Item 3.D. Risk Factors” contained in this annual report. We caution you not to place undue reliance on the forward-looking statements, which speak only as of the date of this annual report. Except as required by law, we are not under any obligation, and expressly disclaim any obligation, to update or alter any forward-looking statements, whether as a result of new information, future events or otherwise.

All subsequent forward-looking statements attributable to us or any person acting on our behalf are expressly qualified in their entirety by the cautionary statements contained or referred to in this annual report.

Item 1. IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS

Not Applicable

Item 2. OFFER STATISTICS AND EXPECTED TIMETABLE

Not Applicable

Item 3. KEY INFORMATION

Item 3.A. Selected Financial Data

The selected consolidated financial and operating data set forth below as of and for the years ended December 31, 2013, 2014, 2015, 2016 and 2017 have been derived from our audited consolidated financial statements, which have been prepared in accordance with IFRS as issued by the IASB. Our consolidated financial statements as of and for the years ended December 31, 2013, 2014, 2015, 2016 and 2017 have been audited by Deloitte Anjin LLC, an independent registered public accounting firm.

The Korean government, which currently owns 18.43% of our outstanding common stock through the KDIC, has been implementing a privatization plan with respect to Woori Finance Holdings and its former subsidiaries, including us. As a result of the dispositions of Woori Finance Holdings’ ownership interests in Kwangju Bank, Kyongnam Bank, Woori Investment & Securities, Woori Aviva Life Insurance, Woori Asset Management, Woori Financial, Woori FG Savings Bank and Woori F&I in 2014, these former subsidiaries of Woori Finance Holdings were classified as a disposal group held for distribution or sale in our consolidated statement of financial position as of December 31, 2013 and have been accounted for as discontinued operations in our consolidated statements of comprehensive income for the years ended December 31, 2013 and 2014. See “Item 4.A. History and Development of the Company—Privatization Plan.”

You should read the following data together with the more detailed information contained in “Item 5. Operating and Financial Review and Prospects” and our consolidated financial statements included elsewhere in this annual report. Historical results do not necessarily predict future results.

3

Consolidated Statement of Comprehensive Income Data

	Year ended December 31,
	2013(1)			2014(1)			2015			2016			2017			2017(2)
	(in billions of Won except per share data)															(in millions of US$ except per share data)
Interest income	￦	9,493		￦	9,211		￦	8,698		￦	8,512		￦	8,551		US$	8,011
Interest expense		(5,001	)		(4,718	)		(3,936	)		(3,492	)		(3,330	)		(3,120	)
Net interest income		4,492			4,493			4,762			5,020			5,221			4,891
Fees and commissions income		1,565			1,598			1,757			1,865			2,069			1,939
Fees and commissions expense		(639	)		(681	)		(781	)		(928	)		(999	)		(936	)
Net fees and commissions income		926			917			976			937			1,070			1,003
Dividend income		88			97			103			185			125			117
Net gain (loss) on financial assets at fair value through profit or loss		124			190			240			114			(105	)		(98	)
Net gain (loss) on available-for-sale financial assets		(85	)		(69	)		(3	)		(1	)		193			180
Impairment losses due to credit loss		(2,277	)		(1,097	)		(966	)		(834	)		(785	)		(736	)
Net other operating expenses(3)		(3,028	)		(3,633	)		(3,761	)		(3,847	)		(3,562	)		(3,337	)
Operating income		240			898			1,351			1,574			2,157			2,020
Share of loss of joint ventures and associates		(1	)		(68	)		(70	)		(20	)		(101	)		(95	)
Other net non-operating income (expense)		49			4			171			(1	)		(106	)		(99	)
Non-operating income (loss)		48			(64	)		101			(21	)		(207	)		(194	)
Net income before income tax expense		288			834			1,452			1,553			1,950			1,826
Income tax expense		(35	)		(288	)		(377	)		(276	)		(420	)		(393	)
Net income from continuing operations		253			546			1,075			1,277			1,530			1,433
Net income (loss) from discontinued operations		(966	)		662			—			—			—			—
Net income (loss)	￦	(713	)	￦	1,208		￦	1,075		￦	1,277		￦	1,530		US$	1,433
Remeasurement of the net defined benefit liability		9			(52	)		(78	)		34			10			10
Items that will not be reclassified to profit or loss		9			(52	)		(78	)		34			10			10
Gain (loss) on available-for-sale financial assets		(51	)		(75	)		72			13			(85	)		(79	)
Share of other comprehensive income (loss) of joint ventures and associates		(6	)		(2	)		3			(8	)		1			1
Gain (loss) on foreign currency translation of foreign operations		(60	)		48			34			29			(208	)		(196	)
Gain (loss) on valuation of cash flow hedge		(2	)		(27	)		—			10			1			1
Equity related to assets held for sale		—			—			—			—			4			4
Items that may be reclassified to profit or loss		(119	)		(56	)		109			44			(287	)		(269	)
Other comprehensive gain (loss), net of tax		(110	)		(108	)		31			78			(277	)		(259	)
Total comprehensive income (loss)	￦	(823	)	￦	1,100		￦	1,106		￦	1,355		￦	1,253		US$	1,174
Net income (loss) attributable to owners	￦	(538	)	￦	1,214		￦	1,059		￦	1,261		￦	1,512		US$	1,417
Income from continuing operations		162			435			1,059			1,261			1,512			1,417
Income (loss) from discontinued operations		(700	)		779			—			—			—			—
Net income (loss) attributable to non-controlling interests	￦	(175	)	￦	(6	)	￦	16		￦	16		￦	18		US$	16
Income from continuing operations		91			111			16			16			18			16
Loss from discontinued operations		(266	)		(117	)		—			—			—			—
Comprehensive income (loss) attributable to owners		(623	)		1,192			1,095			1,332			1,249			1,170
Comprehensive income (loss) attributable to non-controlling interests		(200	)		(92	)		11			23			4			4
Basic and diluted earnings (loss) from continuing and discontinued operations per share	￦	(704	)	￦	1,621		￦	1,301		￦	1,567		￦	1,999		US$	1.873
Basic and diluted earnings from continuing operations per share		165			536			1,301			1,567			1,999			1.873
Per common share data:
Net income (loss) per share—basic	￦	(704	)	￦	1,621		￦	1,301		￦	1,567		￦	1,999		US$	1.873
Weighted average common shares outstanding—basic (in thousands)		806,013			718,265			673,271			673,271			673,271			673,271
Net income (loss) per share—diluted	￦	(704	)	￦	1,621		￦	1,301		￦	1,567		￦	1,999		US$	1.873
Weighted average common shares outstanding—diluted (in thousands)		806,013			718,265			673,271			673,271			673,271			673,271
Cash dividends paid per share	￦	—		￦	500		￦	500		￦	400		￦	500		US$	0.47

⁽¹⁾  The amounts for 2013 and 2014 reflect the classification of certain former subsidiaries as discontinued operations.

⁽²⁾  Won amounts are expressed in U.S. dollars at the rate of ￦1,067.4 to US$1.00, the noon buying rate in effect on December 31, 2017 as quoted by the Federal Reserve Bank of New York in the United States.

⁽³⁾  Includes general and administrative expenses. For a description of “net other operating expenses,” see Note 40 of the notes to our consolidated financial statements.

4

Consolidated Statement of Financial Position Data

	As of December 31,
	2013(1)			2014			2015			2016			2017			2017(2)
	(in billions of Won)															(in millions of US$)
Assets
Cash and cash equivalents	￦	5,478		￦	5,963		￦	6,644		￦	7,591		￦	6,908		US$	6,472
Financial assets at fair value through profit or loss		4,806			4,554			5,133			5,651			5,843			5,474
Available-for-sale financial assets		17,085			18,811			17,171			20,818			15,353			14,383
Held-to-maturity financial assets		12,039			13,044			13,622			13,910			16,749			15,691
Loans and receivables		211,912			223,370			244,842			258,393			267,106			250,235
Investments in joint ventures and associates		618			648			644			439			417			391
Investment properties		341			358			351			358			371			348
Premises and equipment		2,536			2,501			2,471			2,458			2,478			2,321
Intangible assets and goodwill		269			296			420			484			519			486
Assets held for sale		1			8			18			2			49			46
Current tax assets		143			5			7			6			5			4
Deferred tax assets		155			258			210			232			280			263
Derivative assets		131			196			183			141			59			56
Other assets(3)		179			145			143			200			158			148
Disposal group held for sale		34,685			—			—			—			—			—
Disposal group held for distribution to owners		50,312			—			—			—			—			—
Total assets	￦	340,690		￦	270,157		￦	291,859		￦	310,683		￦	316,295		US$	296,318
Liabilities
Financial liabilities at fair value through profit or loss	￦	2,507		￦	2,675		￦	3,461		￦	3,803		￦	3,428		US$	3,211
Deposits due to customers		175,324			188,516			209,142			221,020			234,695			219,871
Borrowings		18,232			17,708			20,034			18,770			14,785			13,851
Debentures		21,678			24,796			21,899			23,566			27,869			26,110
Provisions		685			692			517			429			410			385
Net defined benefit liability		72			75			99			65			43			41
Current tax liabilities		10			299			109			171			233			218
Deferred tax liabilities		49			22			19			22			23			21
Derivative liabilities		2			—			—			7			68			63
Other financial liabilities(4)		19,914			16,890			16,964			21,985			13,892			13,015
Other liabilities(5)		410			391			305			299			284			266
Liabilities directly associated with disposal group held for sale		32,048			—			—			—			—			—
Liabilities directly associated with disposal group held for distribution to owners		46,882			—			—			—			—			—
Total liabilities	￦	317,813		￦	252,064		￦	272,549		￦	290,137		￦	295,730		US$	277,052
Equity
Owners’ equity
Capital stock	￦	4,030		￦	3,381		￦	3,381		￦	3,381		￦	3,381		US$	3,168
Hybrid securities		498			2,539			3,334			3,575			3,018			2,827
Capital surplus		177			291			294			286			286			268
Other equity(6)		(35	)		(2,393	)		(1,547	)		(1,468	)		(1,939	)		(1,817	)
Retained earnings		13,113			14,165			13,726			14,612			15,620			14,633
Equity directly associated with disposal group held for sale		30			—			—			—			—			—
Equity directly associated with disposal group held for distribution to owners		36			—			—			—			—			—
Non-controlling interests		5,028			110			122			160			199			187
Total equity	￦	22,877		￦	18,093		￦	19,310		￦	20,546		￦	20,565		US$	19,266
Total liabilities and equity	￦	340,690		￦	270,157		￦	291,859		￦	310,683		￦	316,295		US$	296,318

⁽¹⁾  The amounts as of December 31, 2013 reflect the classification of certain former subsidiaries as a disposal group held for distribution or sale.

⁽²⁾  Won amounts are expressed in U.S. dollars at the rate of ￦1,067.4 to US$1.00, the noon buying rate in effect on December 31, 2017 as quoted by the Federal Reserve Bank of New York in the United States.

⁽³⁾  For a description of “other assets,” see Notes 19 and 24 of the notes to our consolidated financial statements.

⁽⁴⁾  For a description of “other financial liabilities,” see Note 25 of the notes to our consolidated financial statements.

⁽⁵⁾  For a description of “other liabilities,” see Note 25 of the notes to our consolidated financial statements.

⁽⁶⁾  For a description of “other equity,” see Note 30 of the notes to our consolidated financial statements.

5

Profitability Ratios and Other Data

	Year ended December 31,
	2013(1)			2014(1)			2015			2016			2017
	(in billions of Won except percentages)
Return on average assets(2)		(0.22	)%		0.47	%		0.37	%		0.41	%		0.49	%
Return on average equity(3)		(3.45	)		6.74			5.62			6.26			7.25
Net interest spread(4)		1.83			1.72			1.67			1.65			1.69
Net interest margin(5)		1.94			1.82			1.74			1.71			1.74
Cost-to-income ratio(6)		59.30			68.38			66.22			66.48			60.79
Average equity as a percentage of average total assets		6.50			7.03			6.63			6.60			6.71
Total revenue(7)	￦	11,185		￦	11,027		￦	10,795		￦	10,675		￦	10,833
Operating expense(8)		8,668			9,032			8,478			8,267			7,891
Operating margin(9)		2,517			1,995			2,317			2,408			2,942
Operating margin as a percentage of total revenue		22.50	%		18.09	%		21.46	%		22.56	%		27.16	%

⁽¹⁾  The amounts for 2013 and 2014 exclude certain former subsidiaries classified as discontinued operations.

⁽²⁾  Represents net income attributable to owners as a percentage of average total assets. Average balances are based on daily balances for us and on quarterly balances for all of our subsidiaries and our structured companies.

⁽³⁾  Represents net income attributable to owners as a percentage of average equity. Average balances are based on daily balances for us and on quarterly balances for all of our subsidiaries and our structured companies.

⁽⁴⁾  Represents the difference between the yield on average interest-earning assets and cost of average interest-bearing liabilities.

⁽⁵⁾  Represents the ratio of net interest income to average interest-earning assets.

⁽⁶⁾  Represents the ratio of non-interest expense (excluding impairment losses due to credit loss) to the sum of net interest income and non-interest income.

⁽⁷⁾  Represents the sum of interest income, dividend income, fees and commissions income, net gain (loss) on financial assets at fair value through profit or loss and net gain (loss) on available-for-sale financial assets.

The following table shows how total revenue is calculated:

	Year ended December 31,
	2013(a)			2014(a)			2015			2016			2017
	(in billions of Won)
Interest income	￦	9,493		￦	9,211		￦	8,698		￦	8,512		￦	8,551
Fees and commissions income		1,565			1,598			1,757			1,865			2,069
Dividend income		88			97			103			185			125
Net gain (loss) on financial assets at fair value through profit or loss		124			190			240			114			(105	)
Net gain (loss) on available-for-sale financial assets		(85	)		(69	)		(3	)		(1	)		193
Total revenue	￦	11,185		￦	11,027		￦	10,795		￦	10,675		￦	10,833

^(a)  The amounts for 2013 and 2014 exclude certain former subsidiaries classified as discontinued operations.

⁽⁸⁾  Represents interest expense, fees and commissions expense and net other operating expense, excluding impairment losses due to credit loss of ￦2,277 billion, ￦1,097 billion, ￦966 billion, ￦834 billion and ￦785 billion for 2013, 2014, 2015, 2016 and 2017, respectively.

The following table shows how operating expense is calculated:

	Year ended December 31,
	2013(a)		2014(a)		2015		2016		2017
	(in billions of Won)
Interest expense	￦	5,001	￦	4,718	￦	3,936	￦	3,492	￦	3,330
Fees and commissions expense		639		681		781		928		999
Net other operating expenses		3,028		3,633		3,761		3,847		3,562
Operating expense	￦	8,668	￦	9,032	￦	8,478	￦	8,267	￦	7,891

^(a)  The amounts for 2013 and 2014 exclude certain former subsidiaries classified as discontinued operations.

⁽⁹⁾  Represents total revenue less operating expense.

6

Asset Quality Data

				As of December 31,
	2013(1)			2014			2015			2016			2017
				(in billions of Won, except percentages)
Total loans(2)	￦	193,766		￦	207,077		￦	227,169		￦	236,801		￦	252,793
Total non-performing loans(3)		4,996			3,818			2,909			2,080			1,853
Other impaired loans not included in non-performing loans		690			692			339			335			374
Total non-performing loans and other impaired loans		5,685			4,510			3,248			2,415			2,227
Total allowance for credit losses		3,337			2,609			2,051			1,851			1,770
Non-performing loans as a percentage of total loans		2.58	%		1.84	%		1.28	%		0.88	%		0.73	%
Non-performing loans as a percentage of total assets		1.47			1.41			1.00			0.67			0.59
Total non-performing loans and other impaired loans as a percentage of total loans		2.93			2.18			1.43			1.02			0.88
Allowance for credit losses as a percentage of total loans		1.72			1.26			0.90			0.78			0.70

⁽¹⁾  The amounts as of December 31, 2013 exclude certain former subsidiaries classified as a disposal group held for distribution or sale.

⁽²⁾  Not including due from banks and other receivables, and prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs.

⁽³⁾  Defined as those loans that are past due by 90 days or more or classified as substandard or below based on the Financial Services Commission’s asset classification criteria. See “Item 4.B. Business Overview—Assets and Liabilities—Asset Quality of Loans—Loan Classifications.”

7

Selected Financial Information

Average Balances and Related Interest

The following tables show our average balances and interest rates for the past three years:

	Year ended December 31,
	2015							2016							2017
	Average Balance(1)		Interest Income(2)		Average Yield			Average Balance(1)		Interest Income(2)		Average Yield			Average Balance(1)		Interest Income(2)		Average Yield
	(in billions of Won, except percentages)
Assets
Interest-earning assets
Due from banks	￦	12,483	￦	81		0.65	%	￦	14,807	￦	75		0.51	%	￦	15,594	￦	83		0.53	%
Loans(3)
Commercial and industrial		95,241		3,502		3.68			98,202		3,220		3.28			95,349		3,141		3.29
Trade financing		13,762		200		1.45			13,159		213		1.62			12,155		240		1.97
Lease financing(4)		—		—		—			4		—		—			35		1		3.73
Other commercial		9,890		241		2.44			9,697		221		2.28			9,064		211		2.33
General purpose household(5)		59,003		2,147		3.64			61,918		2,111		3.41			66,420		2,287		3.44
Mortgage		34,770		1,113		3.20			45,007		1,323		2.94			47,545		1,405		2.96
Credit cards(2)		5,547		497		8.96			6,300		547		8.68			6,772		551		8.14
Total loans		218,213		7,700		3.53			234,287		7,635		3.26			237,340		7,836		3.30
Securities
Trading		2,359		63		2.67			2,665		63		2.36			2,712		53		1.95
Investment(6)		29,513		808		2.74			31,348		700		2.23			32,881		548		1.67
Total securities		31,872		871		2.73			34,013		763		2.24			35,593		601		1.69
Other		10,707		46		0.43			11,157		39		0.35			11,164		31		0.28
Total average interest earning assets		273,275		8,698		3.18			294,264		8,512		2.89			299,691		8,551		2.85
Total average non-interest earning assets		10,892		—		—			11,289		—		—			11,104		—		—
Total average assets	￦	284,167	￦	8,698		3.06	%	￦	305,553	￦	8,512		2.79	%	￦	310,795	￦	8,551		2.75	%

	Year ended December 31,
	2015							2016							2017
	Average Balance(1)		Interest Expense		Average Cost			Average Balance(1)		Interest Expense		Average Cost			Average Balance(1)		Interest Expense		Average Cost
	(in billions of Won, except percentages)
Liabilities
Interest-bearing liabilities
Deposits due to customers
Demand deposits	￦	8,376	￦	43		0.51	%	￦	9,742	￦	76		0.78	%	￦	8,319	￦	52		0.63	%
Time and savings deposits		168,212		2,573		1.53			181,073		2,166		1.20			186,277		2,008		1.08
Certificates of deposit		1,880		36		1.91			3,476		59		1.70			4,553		78		1.71
Other deposits		19,294		236		1.22			23,405		246		1.05			24,444		242		0.99
Total deposits		197,762		2,888		1.46			217,696		2,547		1.17			223,593		2,380		1.06
Borrowings		20,269		217		1.07			20,054		215		1.07			17,669		238		1.35
Debentures		23,232		708		3.05			22,988		619		2.69			25,865		639		2.47
Other		19,283		123		0.64			19,994		111		0.56			19,037		73		0.38
Total average interest-bearing liabilities		260,546		3,936		1.51			280,732		3,492		1.24			286,164		3,330		1.16
Total average non-interest-bearing liabilities		4,787		—		—			4,663		—		—			3,767		—		—
Total average liabilities		265,333		3,936		1.48			285,395		3,492		1.22			289,931		3,330		1.15
Total average equity		18,834		—		—			20,158		—		—			20,864		—		—
Total average liabilities and equity	￦	284,167	￦	3,936		1.39	%	￦	305,553	￦	3,492		1.14	%	￦	310,795	￦	3,330		1.07	%

⁽¹⁾  Average balances are based on daily balances for us and on quarterly balances for all of our subsidiaries and our structured companies.

⁽²⁾  Interest income from credit cards is derived from interest on credit card loans and credit card installment purchases.

8

⁽³⁾  Not including other receivables, and prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs.

⁽⁴⁾  Includes automobile lease financing to consumer borrowers.

⁽⁵⁾  Includes home equity loans.

⁽⁶⁾  Includes available-for-sale financial assets and held-to-maturity financial assets.

Analysis of Changes in Net Interest Income—Volume and Rate Analysis

The following table provides an analysis of changes in interest income, interest expense and net interest income based on changes in volume and changes in rate for 2016 compared to 2015 and 2017 compared to 2016. Information is provided with respect to: (1) effects attributable to changes in volume (changes in volume multiplied by prior rate) and (2) effects attributable to changes in rate (changes in rate multiplied by prior volume). Changes attributable to the combined impact of changes in rate and volume have been allocated proportionately to the changes due to volume changes and changes due to rate changes.

	2016 vs. 2015 Increase/(decrease) due to changes in									2017 vs. 2016 Increase/(decrease) due to changes in
	Volume			Rate			Total			Volume			Rate			Total
	(in billions of Won)
Interest-earning assets
Due from banks	￦	15		￦	(21	)	￦	(6	)	￦	4		￦	4		￦	8
Loans(1)
Commercial and industrial		109			(391	)		(282	)		(94	)		15			(79	)
Trade financing		(9	)		22			13			(16	)		43			27
Lease financing(2)		—			—			—			1			—			1
Other commercial		(5	)		(15	)		(20	)		(14	)		4			(10	)
General purpose household(3)		106			(142	)		(36	)		154			22			176
Mortgage		328			(118	)		210			75			7			82
Credit cards		67			(17	)		50			41			(37	)		4
Securities
Trading		8			(8	)		—			1			(11	)		(10	)
Investment(4)		50			(158	)		(108	)		34			(186	)		(152	)
Other		2			(9	)		(7	)		—			(8	)		(8	)
Total interest income	￦	671		￦	(857	)	￦	(186	)	￦	186		￦	(147	)	￦	39
Interest-bearing liabilities
Deposits due to customers
Demand deposits	￦	7		￦	26		￦	33		￦	(11	)	￦	(13	)	￦	(24	)
Time and savings deposits		197			(604	)		(407	)		62			(220	)		(158	)
Certificates of deposit		30			(7	)		23			18			1			19
Other deposits		50			(40	)		10			11			(15	)		(4	)
Borrowings		(2	)		—			(2	)		(26	)		49			23
Debentures		(7	)		(82	)		(89	)		77			(57	)		20
Other		5			(17	)		(12	)		(5	)		(33	)		(38	)
Total interest expense	￦	280		￦	(724	)	￦	(444	)	￦	126		￦	(288	)	￦	(162	)
Net interest income	￦	391		￦	(133	)	￦	258		￦	60		￦	141		￦	201

⁽¹⁾  Not including other receivables and prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs.

⁽²⁾  Includes automobile lease financing to consumer borrowers.

⁽³⁾  Includes home equity loans.

⁽⁴⁾  Includes available-for-sale financial assets and held-to-maturity financial assets.

9

Exchange Rates

The table below sets forth, for the periods and dates indicated, information concerning the noon buying rate for Won, expressed in Won per one U.S. dollar. The “noon buying rate” is the rate in New York City for cable transfers in foreign currencies as certified for customs purposes by the Federal Reserve Bank of New York. Unless otherwise stated, translations of Won amounts into U.S. dollars in this annual report were made at the noon buying rate in effect on December 31, 2017, which was ￦1,067.4 to US$1.00. We do not intend to imply that the Won or U.S. dollar amounts referred to herein could have been or could be converted into U.S. dollars or Won, as the case may be, at any particular rate, or at all. On April 20, 2018, the noon buying rate was ￦1,071.0 = US$1.00.

	Won per U.S. dollar (noon buying rate)
	Low		High		Average(1)		Period-End
2013		1,050.1		1,161.3		1,094.7		1,055.3
2014		1,008.9		1,117.7		1,052.3		1,090.9
2015		1,063.0		1,196.4		1,131.0		1,169.3
2016		1,090.0		1,242.6		1,159.3		1,203.7
2017		1,067.4		1,207.2		1,129.0		1,067.4
October		1,115.7		1,146.2		1,130.9		1,115.7
November		1,079.3		1,120.0		1,099.8		1,084.8
December		1,067.4		1,094.6		1,082.9		1,067.4
2018 (through April 20)		1,054.6		1,093.0		1,070.0		1,071.0
January		1,057.6		1,073.6		1,065.6		1,068.3
February		1,065.3		1,093.0		1,078.5		1,082.1
March		1,060.3		1,081.3		1,069.9		1,061.0
April (through April 20)		1,054.6		1,071.6		1,065.2		1,071.0

Source: Federal Reserve Bank of New York

⁽¹⁾  The average of the daily noon buying rates of the Federal Reserve Bank in effect during the relevant period (or portion thereof).

Item 3.B. Capitalization and Indebtedness

Not Applicable

Item 3.C. Reasons for the Offer and Use of Proceeds

Not Applicable

Item 3.D. Risk Factors

Risks relating to our corporate credit portfolio

The largest portion of our exposure is to small- and medium-sized enterprises, and financial difficulties experienced by companies in this segment may result in a deterioration of our asset quality and have an adverse impact on us.

Our loans to small- and medium-sized enterprises amounted to ￦67,115 billion, or 29.5% of our total loans, as of December 31, 2015, ￦68,434 billion, or 28.9% of our total loans, as of December 31, 2016 and ￦74,906 billion, or 29.6% of our total loans, as of December 31, 2017. As of December 31, 2017, Won-denominated loans to small- and medium-sized enterprises that were classified as substandard or below were ￦595 billion, representing 0.8% of such loans to those enterprises. See “Item 4.B. Business Overview—Corporate Banking—Small and Medium-Sized Enterprise Banking.” We recorded charge-offs of ￦325 billion in respect of our Won-denominated loans to small- and medium-sized enterprises in 2017, compared to charge-offs of ￦469 billion in 2016 and ￦472 billion in 2015. According to data compiled by the Financial Supervisory Service, the industry-wide delinquency ratios for Won-denominated loans to small- and medium-sized enterprises decreased in 2016 and 2017. The delinquency ratio for small- and medium-sized enterprises is calculated as the ratio of (1) the

10

outstanding balance of such loans in respect of which either principal or interest payments are overdue by one month or more to (2) the aggregate outstanding balance of such loans. Our delinquency ratio for such loans denominated in Won was 1.4% as of December 31, 2015, 0.9% as of December 31, 2016 and 0.5% as of December 31, 2017. Our delinquency ratio may increase in 2018 as a result of, among other things, adverse changes in economic conditions in Korea and globally. See “—Other risks relating to our business—Unfavorable changes in the global financial markets could adversely affect our results of operations and financial condition.” Accordingly, we may be required to take measures to decrease our exposures to these customers.

In light of the deteriorating financial condition and liquidity position of small- and medium-sized enterprises in Korea as a result of the global financial crisis commencing in the second half of 2008, the Korean government introduced measures intended to encourage Korean banks to provide financial support to small- and medium-sized enterprise borrowers. For example, the Korean government requested Korean banks, including us, to establish a “fast track” program to provide liquidity assistance to small- and medium-sized enterprises on an expedited basis. Under the “fast track” program we established, liquidity assistance is provided to small- and medium-sized enterprise borrowers applying for such assistance, in the form of new short term loans or maturity extensions or interest rate adjustments with respect to existing loans, after expedited credit review and approval. The overall prospects for the Korean economy in 2018 and beyond remain uncertain, and the Korean government may extend or renew existing or past policies and initiatives or introduce new policies or initiatives to encourage Korean banks to provide financial support to small- and medium-sized enterprises. We believe that, to date, our participation in such government-led initiatives (primarily through the “fast track” program) has not caused us to extend a material amount of credit that we would not have otherwise extended nor materially impacted our results of operations and financial condition in general. The aggregate amount of outstanding small- and medium-sized enterprise loans made by us under the “fast track” program was ￦126 billion as of December 31, 2017, which represented 0.17% of our total small- and medium-sized enterprise loan portfolio as of such date. Furthermore, loans made by us under the “fast track” program are partially guaranteed by the Korean government’s public financial institutions, including the Korea Credit Guarantee Fund and the Korea Technology Finance Corporation. However, there can be no assurance that our future participation in such government-led initiatives would not lead us to extend credit to small- and medium-sized enterprise borrowers that we would not otherwise extend, or offer terms for such credit that we would not otherwise offer, in the absence of such initiatives. Furthermore, there is no guarantee that the financial condition and liquidity position of our small- and medium-sized enterprise borrowers benefiting from such initiatives will improve sufficiently for them to service their debt on a timely basis, or at all. Accordingly, increases in our exposure to small- and medium-sized enterprises resulting from such government-led initiatives may have a material adverse effect on our results of operations and financial condition.

Many small- and medium-sized enterprises represent sole proprietorships or very small businesses dependent on a relatively limited number of suppliers or customers and tend to be affected by fluctuations in the Korean and global economy to a greater extent than large corporate borrowers. In addition, small- and medium-sized enterprises often maintain less sophisticated financial records than large corporate borrowers. Therefore, it is generally more difficult for us to judge the level of risk inherent in lending to these enterprises, as compared to large corporations.

In addition, many small- and medium-sized enterprises have close business relationships with large corporations in Korea, primarily as suppliers. Any difficulties encountered by those large corporations would likely hurt the liquidity and financial condition of related small- and medium-sized enterprises, including those to which we have exposure, also resulting in an impairment of their ability to repay loans.

Financial difficulties experienced by small- and medium-sized enterprises as a result of, among other things, adverse changes in domestic and global economic conditions, as well as aggressive marketing and competition among banks to lend to this segment, may lead to a deterioration in the asset quality of our loans to this segment in the future. Any such deterioration would result in increased charge-offs, higher provisioning and reduced interest and fee income from this segment, which would have an adverse impact on our financial condition and results of operations.

11

We have exposure to Korean construction, shipbuilding and shipping companies, and financial difficulties of these companies may adversely impact us.

As of December 31, 2017, the total amount of loans provided by us to construction, shipbuilding and shipping companies in Korea amounted to ￦4,154 billion, ￦513 billion and ￦452 billion, or 1.6%, 0.2% and 0.2% of our total loans, respectively. We also have other exposures to Korean construction, shipbuilding and shipping companies, including in the form of guarantees extended for the benefit of such companies and debt and equity securities of such companies held by us. In the case of construction companies, we have potential exposure in the form of guarantees provided to us by general contractors with respect to financing extended by us for residential and commercial real estate development projects, as well as commitments to purchase asset-backed securities secured by the assets of companies in the construction industry and other commitments we enter into relating to project financing for such real estate projects which may effectively function as guarantees. In the case of shipbuilding companies, such exposures include refund guarantees extended by us on behalf of shipbuilding companies to cover their obligation to return a portion of the ship order contract amount to customers in the event of performance delays or defaults under shipbuilding contracts.

Although the construction industry in Korea has shown signs of recovery since 2015, excessive investment in residential property development projects, the recent strengthening of mortgage lending regulations by the Korean government, stagnation of real property prices and reduced demand for residential property in areas outside of Seoul, are expected to continue to negatively impact the construction industry. The shipbuilding industry in Korea has experienced a severe downturn in recent years reflecting a significant decrease in ship orders, primarily due to adverse conditions in the global economy and the resulting slowdown in global trade. In the case of shipping companies in Korea, reduced shipping rates and high chartering costs, together with the slowdown in global trade, have contributed to the deterioration of their financial condition, requiring some of them to file for bankruptcy or pursue voluntary restructuring of their debt.

In response to the deteriorating financial condition and liquidity position of borrowers in the Korean construction, shipbuilding and shipping industries, which were disproportionately impacted by adverse domestic and global economic developments, the Korean government implemented a program in 2009 to promote expedited restructuring of such borrowers by their Korean creditor financial institutions, under the supervision of major commercial banks. In accordance with such program, 24 construction companies and five shipbuilding companies became subject to workout in 2009, following review by their creditor financial institutions (including us) and the Korean government. Each year since 2009, the Financial Services Commission and the Financial Supervisory Service have announced the results of subsequent credit risk evaluations conducted by creditor financial institutions (including us) of companies in Korea with outstanding debt of ￦50 billion or more, pursuant to which a number of companies were selected by such financial institutions for restructuring in the form of workout, liquidation or court receivership. Most recently, in 2017, 25 companies with outstanding debt of ￦50 billion or more (eight of which were construction companies and three of which were shipbuilding companies) were selected by such financial institutions for restructuring. There is no assurance, however, that these measures will be successful in stabilizing the Korean construction, shipbuilding and shipping industries.

The allowance for credit losses that we have established against our credit exposures to Korean construction, shipbuilding and shipping companies may not be sufficient to cover all future losses arising from these and other exposures. If the credit quality of our exposures to such companies declines further, we may incur substantial additional provisions for credit loss, which could adversely impact our results of operations and financial condition. Furthermore, although a portion of our loans to construction, shipbuilding and shipping companies are secured by collateral, such collateral may not be sufficient to cover uncollectible amounts in respect of such loans.

A large portion of our exposure is concentrated in a relatively small number of large corporate borrowers, which increases the risk of our corporate credit portfolio.

As of December 31, 2017, our 20 largest exposures to corporate borrowers (including loans, debt and equity securities, credit-related commitments and other exposures) totaled ￦47,540 billion, which represented 12.5% of

12

our total exposures. As of that date, our single largest corporate exposure was to the Bank of Korea, to which we had outstanding credits in the form of debt securities of ￦6,610 billion and loans in Won of ￦1,420 billion, representing 2.1% of our total exposures in the aggregate. Aside from exposure to the Korean government and government-related agencies, our next largest exposure was to Samsung Electronics, to which we had outstanding exposure of ￦2,479 billion representing 0.7% of our total exposures. Any deterioration in the financial condition of our large corporate borrowers may require us to record substantial additional allowances and may have a material adverse impact on our results of operations and financial condition.

We have exposure to the largest Korean commercial conglomerates, known as “chaebols,” and, as a result, financial difficulties of chaebols may have an adverse impact on us.

Of our 20 largest corporate exposures as of December 31, 2017, five were to companies that were members of the 24 largest chaebols in Korea. As of that date, the total amount of our exposures to the 24 largest chaebols was ￦25,092 billion, or 6.6% of our total exposures. If the credit quality of our exposures to chaebols declines as a result of financial difficulties they experience or for other reasons, we could incur additional provisions for credit loss, which would hurt our results of operations and financial condition. See “Item 4.B. Business Overview—Assets and Liabilities—Loan Portfolio—Exposure to Chaebols.”

The allowances we have established against these exposures may not be sufficient to cover all future losses arising from these exposures. In addition, in the case of companies that are in or in the future enter into workout, restructuring, reorganization or liquidation proceedings, our recoveries from those companies may be limited. We may, therefore, experience future losses with respect to these exposures.

We have exposure to companies that are currently or may in the future be put in restructuring, and we may suffer losses as a result of additional provisions for credit loss required or the adoption of restructuring plans with which we do not agree.

As of December 31, 2017, our credit exposures to companies that were in workout or corporate restructuring amounted to ￦648 billion or 0.2% of our total credit exposures, of which ￦528 billion or 81.5% was classified as substandard or below and substantially all of which was classified as impaired. As of the same date, our allowance for credit losses on these credit exposures amounted to ￦249 billion, or 38.4% of these exposures. These allowances may not be sufficient to cover all future losses arising from our credit exposure to these companies. Furthermore, we have other exposure to such companies in the form of debt and equity securities of such companies held by us (including equity securities we acquired as a result of debt-to-equity conversions). Including such securities, our exposures as of December 31, 2017 to companies in workout or restructuring amounted to ￦656 billion, or 0.2% of our total exposures. Our exposures to such companies may also increase in the future, including as a result of adverse conditions in the Korean economy. In addition, in the case of borrowers that are or become subject to workout, we may be forced to restructure our credits pursuant to restructuring plans approved by other creditor financial institutions of the borrower, or to dispose of our credits to other creditors on unfavorable terms, which may adversely affect our results of operations and financial condition.

Risks relating to our consumer credit portfolio

We may experience increases in delinquencies in our consumer loan and credit card portfolios.

In recent years, consumer debt has increased rapidly in Korea. Our portfolio of consumer loans amounted to ￦93,448 billion as of December 31, 2015, ￦104,484 billion as of December 31, 2016 and ￦109,290 billion as of December 31, 2017. Our credit card portfolio amounted to ￦6,099 billion as of December 31, 2015, ￦6,674 billion as of December 31, 2016 and ￦6,827 billion as of December 31, 2017. As of December 31, 2017, our consumer loans and credit card receivables represented 43.2% and 2.7% of our total lending, respectively. See “Item 4.B. Business Overview—Consumer Banking—Lending Activities” and “Item 4.B. Business Overview—Credit Cards—Products and Services.”

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The growth in our consumer loan portfolio in recent years, together with adverse changes in economic conditions in Korea and globally, may lead to increasing delinquencies and a deterioration in asset quality. The amount of our consumer loans classified as substandard or below was ￦345 billion (or 0.4% of our consumer loan portfolio) as of December 31, 2015, ￦305 billion (or 0.3% of our consumer loan portfolio) as of December 31, 2016 and ￦276 billion (or 0.3% of our consumer loan portfolio) as of December 31, 2017. We charged off consumer loans amounting to ￦147 billion in 2017, as compared to ￦155 billion in 2016 and ￦240 billion in 2015, and recorded provisions for credit loss in respect of consumer loans of ￦152 billion in 2017, as compared to ￦77 billion in 2016 and ￦103 billion in 2015. Within our consumer loan portfolio, the outstanding balance of general purpose household loans, which, unlike mortgage or home equity loans, are often unsecured and therefore tend to carry a higher credit risk, amounted to ￦24,179 billion, or 25.9% of our total outstanding consumer loans, as of December 31, 2015, ￦27,113 billion, or 25.9% of our total outstanding consumer loans, as of December 31, 2016 and ￦31,108 billion, or 28.5% of our total outstanding consumer loans, as of December 31, 2017.

In our credit card segment, outstanding balances overdue by more than one month amounted to ￦97 billion, or 1.6% of our credit card receivables, as of December 31, 2015, ￦80 billion, or 1.2% of our credit card receivables, as of December 31, 2016 and ￦88 billion, or 1.3% of our credit card receivables, as of December 31, 2017. In line with industry practice, we have restructured a portion of our delinquent credit card account balances as loans. As of December 31, 2017, these restructured loans amounted to ￦131 billion, or 1.9% of our credit card balances. Because these restructured loans are not initially recorded as being delinquent, our delinquency ratios do not fully reflect all delinquent amounts relating to our credit card balances. Including all restructured loans, outstanding balances overdue by more than one month accounted for 3.1% of our credit card balances as of December 31, 2017. We charged off credit card balances amounting to ￦228 billion in 2017, as compared to ￦242 billion in 2016 and ￦198 billion in 2015, and recorded provisions for credit loss in respect of credit card balances of ￦204 billion in 2017, as compared to ￦207 billion in 2016 and ￦181 billion in 2015. Delinquencies may increase in the future as a result of, among other things, adverse economic conditions in Korea, additional government regulation or the inability of Korean consumers to manage increased household debt.

A deterioration of the asset quality of our consumer loan and credit card portfolios would require us to record increased provisions for credit loss and charge-offs and adversely affect our financial condition and results of operations. In addition, our large exposure to consumer debt means that we are exposed to changes in economic conditions affecting Korean consumers. Accordingly, economic difficulties in Korea that hurt those consumers could result in further deterioration in the credit quality of our consumer loan and credit card portfolios. For example, a rise in unemployment or an increase in interest rates in Korea could adversely affect the ability of consumers to make payments and increase the likelihood of potential defaults. See “Risks relating to Korea—Unfavorable financial and economic developments in Korea may have an adverse effect on us.”

In addition, we are exposed to changes in regulations and policies on consumer lending by the Korean government, which may adopt measures to restrict consumer lending or encourage financial institutions to provide financial support to certain types of retail borrowers. In 2014 and 2015, the Korean government implemented several measures to encourage consumer spending and revive the housing market in Korea, including loosening regulations on mortgage lending, which contributed to an increase in our portfolio of consumer loans. However, the Korean government introduced measures in the second half of 2016 and 2017 to tighten regulations on mortgage lending and housing subscription in response to the rapid growth in consumer debt and concerns over speculative investments in real estate in certain areas. A decrease in housing prices as a result of the implementation of such measures, together with the high level of consumer debt and rising interest rate levels, could result in declines in consumer spending and reduced economic growth, which may lead to increases in delinquency levels of our consumer loan and credit card portfolios.

In light of adverse conditions in the Korean economy affecting consumers, in March 2009, the Financial Services Commission requested Korean banks, including us, to establish a “pre-workout program,” including a credit counseling and recovery service, for retail borrowers with outstanding short-term debt. Under the pre-workout program, which has been in operation since April 2009, maturity extensions and/or interest reductions

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are provided to retail borrowers with total loans of less than ￦1.5 billion (consisting of no more than ￦500 million of unsecured loans and ￦1 billion of secured loans) who are in arrears on their payments for more than 30 days but less than 90 days or for retail borrowers with an annual income of ￦40 million or less who have been in arrears on their payments for 30 days or more on an aggregate basis for the 12 months prior to their application, among others. The aggregate amount of consumer credit (including credit card receivables) we provided which became subject to the pre-workout program in 2017 was ￦32 billion. While we believe that our operation of the pre-workout program has not had a material impact on the overall credit quality of our consumer loan and credit card portfolios to date, our participation in such government-led initiatives to provide financial support to retail borrowers may lead us to offer credit terms for such borrowers that we would not otherwise offer in the absence of such initiatives, which may have an adverse effect on our results of operations and financial condition.

A decline in the value of the collateral securing our consumer loans and our inability to realize full collateral value may adversely affect our consumer credit portfolio.

A substantial portion of our consumer loans is secured by real estate, the values of which have fluctuated significantly in recent years. Although it is our general policy to lend up to 70% of the appraised value of collateral (except in areas of high speculation designated by the government where we generally limit our lending to 40% of the appraised value of collateral) and to periodically re-appraise our collateral, a downturn in the real estate markets in Korea may result in a decline in the value of the collateral securing our mortgage and home equity loans. If collateral values decline in the future, they may not be sufficient to cover uncollectible amounts in respect of our secured loans. Any declines in the value of the real estate or other collateral securing our consumer loans, or our inability to obtain additional collateral in the event of such declines, could result in a deterioration in our asset quality and may require us to record additional allowances for credit losses.

In Korea, foreclosure on collateral generally requires a written petition to a court. An application, when made, may be subject to delays and administrative requirements that may decrease the value of such collateral. We cannot guarantee that we will be able to realize the full value on our collateral as a result of, among other factors, delays in foreclosure proceedings and defects in the perfection of our security interest in collateral. Our failure to recover the expected value of collateral could expose us to potential losses.

Risks relating to our structure and strategy

The implementation of the Korean government’s privatization plan may have an adverse effect on us and your interests as a shareholder.

In June 2013, the Korean government, through the Public Funds Oversight Committee of the Financial Services Commission, announced an updated plan to privatize Woori Finance Holdings and its former subsidiaries, including us. The privatization plan provided for the segregation of such entities into three groups and the disposal of the Korean government’s interest in these entities held through the KDIC in a series of transactions, many of which have been completed. Such transactions included the following:

• Kwangju Bank and Kyongnam Bank. In May 2014, Woori Finance Holdings established KJB Financial Group and KNB Financial Group through a spin-off of its businesses related to the holding of the shares and thereby controlling the business operations of Kwangju Bank and Kyongnam Bank, respectively. As a result of such spin-off, KJB Financial Group became the owner of the shares of Kwangju Bank previously held by Woori Finance Holdings and KNB Financial Group became the owner of the shares of Kyongnam Bank previously held by Woori Finance Holdings. Woori Finance Holdings no longer owned any shares of Kwangju Bank or Kyongnam Bank, and neither they nor their new holding companies were its subsidiaries, after the spin-off. Following such spin-off, each of these banks was merged with its holding company, and in October 2014, the KDIC sold its 56.97% ownership interest in Kwangju Bank and Kyongnam Bank to JB Financial Group and BS Financial Group, respectively.

• Woori Investment & Securities and Other Subsidiaries. In March 2014, Woori Finance Holdings sold its 52.0% ownership interest in Woori Financial to KB Financial Group. In May 2014, Woori Finance

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Holdings sold its 100.0% ownership interest in Woori Asset Management to Kiwoom Securities and sold its 100.0% ownership interest in Woori F&I to Daishin Securities. In June 2014, Woori Finance Holdings sold its 37.9% ownership interest in Woori Investment & Securities, its 51.6% ownership interest in Woori Aviva Life Insurance and its 100.0% ownership interest in Woori FG Savings Bank to NongHyup Financial Group in a collective sale. As a result of such sales, Woori Investment & Securities, Woori Asset Management, Woori Aviva Life Insurance, Woori FG Savings Bank, Woori F&I and Woori Financial were no longer subsidiaries of Woori Finance Holdings, and it no longer owned any shares in such former subsidiaries.

• Woori Bank. In November 2014, Woori Finance Holdings merged with and into us. As a result of the merger, the other former subsidiaries of Woori Finance Holdings, including Woori Card, Woori Private Equity, Woori FIS, Woori Investment Bank and Woori Finance Research Institute, became our subsidiaries. In December 2014, the KDIC sold 40,143,022 shares of our common stock (representing 5.9% of our outstanding common stock) in a private sale in Korea. In addition, in December 2016 and January 2017, the KDIC sold an aggregate of 200,685,395 shares of our common stock (representing 29.7% of our outstanding common stock) in stakes ranging from 3.7% to 6.0% to seven financial companies through a bidding process. Pursuant to a commitment made by the KDIC in connection with such bidding process, five persons, each nominated by one of the winning bidders, were elected as new outside directors at an extraordinary general meeting of our shareholders held in December 2016. See “Item 6.A. Directors and Senior Management—Board of Directors—Outside Directors.” In 2017, pursuant to a series of transactions related to call options previously granted in connection with the KDIC’s sale of our common stock in December 2014, the KDIC sold an aggregate of 19,852,364 shares of our common stock (representing 2.94% of our outstanding common stock). As a result of such transactions, the KDIC’s ownership interest in us was reduced to 18.43%. We expect the KDIC to sell all or a portion of the remaining shares of our common stock it owns to one or more purchasers in the future.

See “Item 4.A. History and Development of the Company—Privatization Plan.”

The implementation of the Korean government’s privatization plan, including the merger of Woori Finance Holdings with and into us, the KDIC’s sale of a combined 29.7% ownership interest in us to seven financial companies and the expected sale of the KDIC’s remaining ownership interest in us to third parties, is likely to have a significant impact on us. For example, the loss of the Korean government as our indirect controlling shareholder, the spin-off of Kwangju Bank and Kyongnam Bank and the loss of our former affiliates such as Woori Investment & Securities that had complementary businesses may have a material adverse effect on our credit profile and credit ratings, as well as our business, financial condition and results of operations. Furthermore, the KDIC’s sale of its ownership interest in us to a small number of third parties may affect our business, management, strategy, capital structure and assets and liabilities and lead to diversion of management attention, a loss of customers and labor unrest. There is also no guarantee that the various transactions completed under the privatization plan will not result in unintended adverse tax consequences for us and our subsidiaries, as well as our shareholders. Accordingly, the implementation of the privatization plan may have a material adverse effect on the trading price of our common stock and American depositary shares, or ADSs, and your interests as a shareholder.

We may not be able to successfully execute our overseas expansion strategy.

As part of our business strategy, we have been seeking opportunities to expand our operations in markets outside Korea, including through the opening of additional overseas branches and offices as well as strategic acquisitions and investments, particularly in South and Southeast Asia. For example, in October 2016, we acquired a 51% equity interest in Wealth Development Bank Corp., a thrift bank in the Philippines. In November 2016, we established a local subsidiary in Vietnam, Woori Bank Vietnam, which commenced operations in January 2017 and currently operates the branches in Hanoi, Bac Ninh and Ho Chi Minh City that we previously operated directly. In July 2017, we expanded our network of branches to India, where we established branches in Gurgaon and Mumbai. Notwithstanding the foregoing, the expansion of our operations abroad may be difficult

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due to the presence of established competitors in the relevant local markets. In addition, overseas expansion and the management of international operations may require significant financial expenditures as well as management attention, and will subject us to the challenges of operating in an unfamiliar business environment with different regulatory, legal and taxation systems and political, economic and social risks. Accordingly, there is no guarantee that we will be successful in executing our overseas expansion strategy. The failure of our overseas expansion strategy could have an adverse impact on our business, results of operations and financial condition.

We may not generate sufficient additional fees to achieve our revenue diversification strategy.

An important element of our overall strategy is increasing our fee income in order to diversify our revenue base, in anticipation of greater competition and declining lending margins. Historically, our primary source of revenues has been net interest income from our banking operations. To date, except for credit card, trust management, bancassurance and currency transfer fees (including foreign exchange-related commissions), and fees collected in connection with the operation of our investment funds, we have not generated substantial fee income. We intend to develop new sources of fee income as part of our business strategy, including through our investment banking and asset management businesses. Although we, like many other Korean financial institutions, have begun to charge fees to our customers more regularly, customers may prove unwilling to pay additional fees, even in exchange for more attractive value-added services, and their reluctance to do so would adversely affect the implementation of our strategy to increase our fee income. Furthermore, the fees that we charge to customers are subject to regulation by Korean financial regulatory authorities, which may seek to implement regulations or measures that may have an adverse impact on our ability to achieve this aspect of our strategy.

Risks relating to competition

Competition in the Korean financial industry is intense, and we may lose market share and experience declining margins as a result.

Competition in the Korean financial market has been and is likely to remain intense. Some of the financial institutions that we compete with are larger in terms of asset size and customer base and have greater financial resources or more specialized capabilities than us. In addition, in the area of our core banking operations, most Korean banks have been focusing on retail customers and small- and medium-sized enterprises in recent years, although they have begun to generally increase their exposure to large corporate borrowers, and have been focusing on developing fee income businesses, including bancassurance and investment products, as increasingly important sources of revenue. In the area of credit cards, Korean banks and credit card companies have in the past engaged in aggressive marketing activities and made significant investments, contributing to some extent to lower profitability and asset quality problems previously experienced with respect to credit card receivables. The competition and market saturation resulting from this common focus may make it more difficult for us to secure retail, small- and medium-sized enterprise and large corporate customers with the credit quality and on credit terms necessary to maintain or increase our income and profitability.

In addition, general regulatory reforms in the Korean financial industry have increased competition among banks and other financial institutions in Korea. In the second half of 2015, the Korean government implemented measures to facilitate bank account portability of retail customers by requiring commercial banks to establish systems that allow retail customers to easily switch their bank accounts at one commercial bank to another and automatically transfer the automatic payment settings of their former accounts to the new ones. Such measures are expected to further intensify competition among financial institutions in Korea. Moreover, in March 2016, the Financial Services Commission introduced an individual savings account scheme in Korea, which enables individuals to efficiently manage a wide range of retail investment vehicles, including cash deposits, investment funds and securities investment products, from a single integrated account with one financial institution and offers tax benefits on investment returns. Since the scheme backed by the Korean government allows only one individual savings account per person, financial institutions have been competing to retain existing customers and attract new customers since the launch of the individual savings account scheme. Over 30 financial

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institutions, including banks, securities companies and insurance companies, have registered with the Financial Services Commission to sell their individual savings account products, and competition among these financial institutions is expected to remain intense.

Furthermore, the introduction of Internet-only banks in Korea is expected to increase competition in the Korean banking industry. Internet-only banks generally operate without branches and conduct most of their operations through electronic means, which enable them to minimize costs and offer customers higher interest rates on deposits or lower lending rates. In April 2017, K bank, the first Internet-only bank in Korea, in which we own 13.8% of the equity with voting rights, commenced operations. Kakao Bank, a mobile-only bank, commenced operations in July 2017.

Moreover, a number of significant mergers and acquisitions in the financial industry have taken place in Korea in recent years, including Hana Financial Group’s acquisition of a controlling interest in Korea Exchange Bank in 2012, the subsequent merger of Hana Bank into Korea Exchange Bank in 2015, KB Financial Group’s acquisition of Hyundai Securities Co., Ltd. in 2016 and the subsequent merger of Hyundai Securities with and into KB Investment & Securities Co., Ltd. in 2016. In 2016, Mirae Asset Securities Co., Ltd. acquired a 43% interest in KDB Daewoo Securities Co., Ltd., which changed its name to Mirae Asset Daewoo Securities Co., Ltd., and subsequently merged with and into Mirae Asset Daewoo Securities to create the largest securities company in Korea in terms of capital. Furthermore, in 2014, pursuant to the implementation of the Korean government’s privatization plan with respect to Woori Finance Holdings and its former subsidiaries, Woori Financial, Woori Asset Management and Woori F&I were acquired by KB Financial Group, Kiwoom Securities and Daishin Securities, respectively, and Woori Investment & Securities, Woori Aviva Life Insurance and Woori FG Savings Bank were acquired by NongHyup Financial Group. In addition, in October 2014, the KDIC’s ownership interest in Kwangju Bank and Kyongnam Bank were acquired by JB Financial Group and BS Financial Group, respectively. See “Item 4.A. History and Development of the Company—Privatization Plan.”

We expect that consolidation in the Korean financial industry will continue. Other financial institutions may seek to acquire or merge with other entities, and the financial institutions resulting from such consolidation may, by virtue of their increased size and business scope, provide significantly greater competition for us. We also believe that foreign financial institutions, many of which have greater experience and resources than we do, may seek to compete with us in providing financial products and services either by themselves or in partnership with existing Korean financial institutions. Increased competition and continuing consolidation may lead to decreased margins, resulting in a material adverse impact on our future profitability. Accordingly, our results of operations and financial condition may suffer as a result of increasing competition in the Korean financial industry.

Competition for customer deposits may increase, resulting in a loss of our deposit customers or an increase in our funding costs.

In recent years, we have faced increasing pricing pressure on deposit products from our competitors. If we do not continue to offer competitive interest rates to our deposit customers, we may lose their business. In addition, even if we are able to match our competitors’ pricing, doing so may result in an increase in our funding costs, which may have an adverse impact on our results of operations.

Other risks relating to our business

Unfavorable changes in the global financial markets could adversely affect our results of operations and financial condition.

The overall prospects for the Korean and global economy in 2018 and beyond remain uncertain. In recent years, the global financial markets have experienced significant volatility as a result of, among other things:

• the financial difficulties affecting many governments worldwide, in particular in Latin America and Europe;

• the slowdown of economic growth in China and other major emerging market economies;

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• interest rate fluctuations as well as the possibility of further increases in policy rates by the U.S. Federal Reserve and other central banks; and

• political and social instability in various countries in the Middle East, including Syria, Iraq and Egypt, as well as the referendum in the United Kingdom in June 2016, in which a majority of voters voted in favor of an exit from the European Union, or Brexit.

In light of the high level of interdependence of the global economy, unfavorable changes in the global financial markets, including as a result of any of the foregoing developments, could have a material adverse effect on the Korean economy and financial markets, and in turn on our business, financial condition and results of operations.

We are also exposed to adverse changes and volatility in the global and Korean financial markets as a result of our liabilities and assets denominated in foreign currencies and our holdings of trading and investment securities, including structured products. The value of the Won relative to major foreign currencies in general and the U.S. dollar in particular has fluctuated widely in recent years. See “Item 3.A. Selected Financial Data—Exchange Rates.” A depreciation of the Won will increase our cost of servicing our foreign currency-denominated debt, while continued exchange rate volatility may also result in foreign exchange losses for us. Furthermore, as a result of changing global and Korean economic conditions, there has been volatility in securities prices, including the stock prices of Korean and foreign companies in which we hold an interest. Such volatility has resulted in and may lead to further trading and valuation losses on our trading and investment securities portfolio as well as impairment losses on our investments in joint ventures and associates.

Our risk management system may not be effective in mitigating risk and loss.

We seek to monitor and manage our risk exposure through a standardized risk management system, encompassing a multi-tiered risk management governance structure under our Board Risk Management Committee, our centralized credit risk management system called the CREPIA system, reporting and monitoring systems, early warning systems and other risk management infrastructure, using a variety of risk management strategies and techniques. See “Item 11. Quantitative and Qualitative Disclosures about Market Risk.” However, such risk management strategies and techniques employed by us and the judgments that accompany their application cannot anticipate the economic and financial outcome in all market environments, and many of our risk management strategies and techniques have a basis in historic market behavior that may limit the effectiveness of such strategies and techniques in times of significant market stress or other unforeseen circumstances. Furthermore, our risk management strategies may not be effective in a difficult or less liquid market environment, as other market participants may be attempting to use the same or similar strategies as us to deal with such market conditions. In such circumstances, it may be difficult for us to reduce our risk positions due to the activity of such other market participants.

We have provided certain assets as collateral in connection with our secured borrowings and could be required to make payments and realize losses in the future relating to those assets.

We have provided certain assets as collateral for our secured borrowings in recent years. As of December 31, 2017, the aggregate amount of assets we had provided as collateral for our secured borrowings was ￦9,693 billion. These secured borrowings may take the form of asset securitization transactions, where we nominally sell our assets to a securitization vehicle that issues securities backed by those assets, although the assets remain on our statements of financial position. These secured borrowings are intended to be fully repaid through recoveries on collateral. Some of these nominal asset sales were with recourse, which means that if delinquencies arise with respect to such assets, we will be required to either repay a proportionate amount of the related secured borrowing (by reversing the nominal sale and repurchasing such assets) or compensate the securitization vehicle for any net shortfalls in its recoveries on such assets. If we are required to make payments on such assets, or to repay our secured borrowings on those assets and are unable to make sufficient recoveries on them, we may realize further losses on these assets.

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An increase in interest rates would decrease the value of our debt securities portfolio and raise our funding costs while reducing loan demand and the repayment ability of our borrowers, which could adversely affect us.

Interest rates in Korea have been subject to significant fluctuations in the past. In an effort to stem inflation amid improved growth prospects, the Bank of Korea gradually increased its policy rate in 2010 and 2011 by a total of 125 basis points to 3.25%. However, the Bank of Korea reduced its policy rate to 2.00% through a series of reductions from 2012 to 2014 to support Korea’s economy in light of the slowdown in Korea’s growth and uncertain global economic prospects. The Bank of Korea further reduced its policy rate to 1.50% in 2015 and again to an unprecedented 1.25% in June 2016 amid deflationary concerns and interest rate cuts by central banks around the world. However, in November 2017, the Bank of Korea increased its policy rate to 1.50% in light of improved growth prospects in Korea and rising interest rate levels globally. All else being equal, further increases in interest rates in the future could lead to a decline in the value of our portfolio of debt securities, which generally pay interest based on a fixed rate. A sustained increase in interest rates will also raise our funding costs, while reducing loan demand, especially among consumers. Rising interest rates may therefore require us to re-balance our asset portfolio and our liabilities in order to minimize the risk of potential mismatches and maintain our profitability. See “Item 11. Quantitative and Qualitative Disclosures about Market Risk.” In addition, rising interest rate levels may adversely affect the Korean economy and the financial condition of our corporate and consumer borrowers, including holders of our credit cards, which in turn may lead to a deterioration in our credit portfolio. In particular, since most of our consumer and corporate loans bear interest at rates that adjust periodically based on prevailing market rates, a sustained increase in interest rates would increase the interest costs of our consumer and corporate borrowers and will adversely affect their ability to make payments on their outstanding loans.

Our funding is highly dependent on short-term deposits, which dependence may adversely affect our operations.

We meet a significant amount of our funding requirements through short-term funding sources, which consist primarily of customer deposits. As of December 31, 2017, approximately 95.8% of these deposits had maturities of one year or less or were payable on demand. In the past, a substantial proportion of these customer deposits have been rolled over upon maturity. We cannot guarantee, however, that depositors will continue to roll over their deposits in the future. In the event that a substantial number of these short-term deposit customers withdraw their funds or fail to roll over their deposits as higher-yielding investment opportunities emerge, our liquidity position could be adversely affected. We may also be required to seek more expensive sources of short-term and long-term funding to finance our operations. See “Item 5.B. Liquidity and Capital Resources—Financial Condition—Liquidity.”

Labor union unrest may disrupt our operations and hinder our ability to continue to reorganize our operations.

Most financial institutions in Korea have experienced periods of labor unrest. In recent years, we have transferred or merged some of the business operations of our subsidiaries and affiliates into one or more entities and implemented other forms of corporate and operational restructuring, including in connection with the Korean government’s privatization plan with respect to Woori Finance Holdings and its former subsidiaries. See “—Risks relating to our structure and strategy—The implementation of the Korean government’s privatization plan may have an adverse effect on us and your interests as a shareholder.” We may also decide to implement other organizational or operational changes, as well as acquisitions or dispositions, in the future. Such efforts have in the past been met with significant opposition from labor unions in Korea. Actual or threatened labor disputes may in the future disrupt the reorganization process and our business operations, which in turn may hurt our financial condition and results of operations.

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The secondary market for corporate bonds in Korea is not fully developed, and, as a result, we may not be able to realize the full “marked-to-market” value of debt securities we hold when we sell any of those securities.

As of December 31, 2017, we held debt securities issued by Korean companies and financial institutions (other than those issued by government-owned or -controlled enterprises or financial institutions, which include the Bank of Korea, the Korea Development Bank, the Korea Housing Finance Corporation and the Industrial Bank of Korea, among others) with a total book value of ￦2,008 billion in our trading and investment securities portfolio. The market value of these securities could decline significantly due to various factors, including future increases in interest rates or a deterioration in the financial and economic condition of any particular issuer or of Korea in general. Any of these factors individually or a combination of these factors would require us to write down the fair value of these debt securities, resulting in impairment losses. Because the secondary market for corporate bonds in Korea is not fully developed, the market value of many of these securities as reflected on our consolidated statements of financial position is determined by references to suggested prices posted by Korean rating agencies, which measure prices based on observable market data. These valuations, however, may differ significantly from the actual value that we could realize in the event we elect to sell these securities. As a result, we may not be able to realize the full “marked-to-market” value at the time of any such sale of these securities and thus may incur additional losses.

We may be required to raise additional capital if our capital adequacy ratio deteriorates or the applicable capital requirements change in the future, but we may not be able to do so on favorable terms or at all.

Under the capital adequacy requirements of the Financial Services Commission, as of December 31, 2017, we were required to maintain a total minimum Tier I common equity capital adequacy ratio of 6.25%, Tier I capital adequacy ratio of 7.75% and combined Tier I and Tier II capital adequacy ratio of 9.75%, on a consolidated basis (including applicable additional capital buffers and requirements as described below). As of December 31, 2017, our Tier I common equity capital, Tier I capital and combined Tier I and Tier II capital ratios were 10.95%, 13.03% and 15.40%, respectively, which exceeded the minimum levels required by the Financial Services Commission. However, our capital base and capital adequacy ratio may deteriorate in the future if our results of operations or financial condition deteriorates for any reason, or if we are not able to deploy our funding into suitably low-risk assets. To the extent that we fail to maintain our capital adequacy ratios in the future, Korean regulatory authorities may impose penalties on us ranging from a warning to suspension or revocation of our licenses.

The current capital adequacy requirements of the Financial Services Commission are derived from a new set of bank capital measures, referred to as Basel III, which the Basel Committee on Banking Supervision initially introduced in 2009 and began phasing in starting from 2013. Commencing in July 2013, the Financial Services Commission promulgated a series of amended regulations implementing Basel III, pursuant to which Korean banks and bank holding companies were required to maintain a minimum ratio of Tier I common equity capital (which principally includes equity capital, capital surplus and retained earnings) to risk-weighted assets of 3.5% and Tier I capital to risk-weighted assets of 4.5% from December 1, 2013, which minimum ratios were increased to 4.0% and 5.5%, respectively, from January 1, 2014 and increased further to 4.5% and 6.0%, respectively, from January 1, 2015. Such requirements are in addition to the pre-existing requirement for a minimum ratio of Tier I and Tier II capital (less any capital deductions) to risk-weighted assets of 8.0%, which remains unchanged. The amended regulations also require an additional capital conservation buffer of 1.25% in 2017 and 1.875% in 2018, with such buffer to increase to 2.5% in 2019, as well as a potential counter-cyclical capital buffer of up to 2.5%, which is determined on a quarterly basis by the Financial Services Commission. Furthermore, we were designated as one of six domestic systemically important banks for 2017 by the Financial Services Commission and were subject to an additional capital requirement of 0.5% in 2017. In June 2017, we were again designated as a domestic systemically important bank for 2018, which would subject us to an additional capital requirement of 0.75% in 2018, with such potential requirement to increase to 1.0% in 2019. The implementation of Basel III in Korea may have a significant effect on the capital requirements of Korean financial institutions, including us. See “Item 4.B. Business Overview—Supervision and Regulation—Principal Regulations Applicable to Banks—Capital Adequacy.”

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We may be required to obtain additional capital in the future in order to remain in compliance with more stringent capital adequacy and other regulatory requirements. However, we may not be able to obtain additional capital on favorable terms, or at all. Our ability to obtain additional capital at any time may be constrained to the extent that banks or other financial institutions in Korea or from other countries are seeking to raise capital at the same time. Depending on whether we are obtaining any necessary additional capital, and the terms and amount of any additional capital obtained, holders of our common stock or ADSs may experience a dilution of their interest.

The application of IFRS 9 Financial Instruments commencing in 2018 could adversely impact our reported results of operations and financial condition.

IFRS 9 Financial Instruments, or IFRS 9, issued by the IASB in July 2014, is a new IFRS accounting standard aimed at improving and simplifying the accounting treatment of financial instruments and is effective for annual periods beginning on or after January 1, 2018. IFRS 9, which replaces International Accounting Standard 39, Financial Instruments: Recognition and Measurement, requires financial assets to be classified and measured on the basis of an entity’s business model for managing financial assets and the contractual cash flow characteristics of the financial assets. A new impairment model is introduced which requires the calculation of allowance for credit losses based on expected credit losses instead of incurred losses by assessing changes in expected credit losses and recognizing such changes as impairment loss (or reversal of impairment loss) in profit or loss. Also, hedge accounting rules are amended to extend to more hedging relationships and to allow more hedging instruments and hedged items to qualify for hedge accounting. The impact on our financial statements due to the application of IFRS 9 will depend on judgments made by us in applying the new standard, the nature of financial instruments held by us and macroeconomic variables.

We have performed an assessment of the financial impact of IFRS 9 on our consolidated financial statements. The application of IFRS 9 will result in higher impairment loss allowances that are recognized earlier, on a more forward-looking basis and on a broader scope of financial instruments than is the case under International Accounting Standard 39 and, as a result, will have a material impact on our reported financial condition. In addition, the move from incurred to expected credit losses will have the potential to impact our performance under stressed economic conditions or regulatory stress tests. In particular, the application of IFRS 9 will result in increases in allowance for credit losses and corresponding decreases in our retained earnings in our consolidated statement of financial position, which could also negatively impact our regulatory capital position. Measurement will require increased complexity in our impairment modeling as it will involve a greater degree of management judgment with respect to forward-looking information. We expect that impairment charges will tend to be more volatile as a result.

An effective implementation of IFRS 9 requires preparation processes including financial impact assessment, accounting policy establishment, accounting system development and system stabilization, and we have taken measures to enhance our financial analysis and impact assessment capabilities in preparation for IFRS 9. Nevertheless, the application of IFRS 9, as well as any other new or revised accounting standards we are required to adopt in the future, could result in significant additional costs and may have a material adverse effect on our reported results of operations and financial condition. For further information regarding IFRS 9, see Note 2-(1)-2) of the notes to our consolidated financial statements.

We engage in limited activities relating to Iran and may become subject to sanctions under relevant laws and regulations of the United States and other jurisdictions as a result of such activities, which may adversely affect our business and reputation.

The U.S. Department of the Treasury’s Office of Foreign Assets Control, or OFAC, administers and enforces certain laws and regulations (which we refer to as OFAC sanctions) that impose restrictions upon activities or transactions within U.S. jurisdiction with certain countries, governments, entities and individuals that are the subject of OFAC sanctions, including Iran. Non-U.S. persons generally are not automatically bound by OFAC sanctions, but to the extent they engage in transactions completed in part in the United States or through U.S. persons (such as, for example, wiring an international payment that clears through a bank branch in New York), they are required to comply with U.S. sanctions. The European Union also enforces certain laws and

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regulations that impose restrictions upon nationals and entities of, and business conducted in, member states with respect to activities or transactions with certain countries, governments, entities and individuals that are the subject of such laws and regulations, including with respect to targeted entities in Iran. The United Nations Security Council and other governmental entities also impose similar sanctions.

The United States also maintains indirect sanctions, which we refer to collectively as U.S. secondary sanctions, which provide authority for the imposition of U.S. sanctions on foreign parties that engage in targeted transactions with no connection to U.S. jurisdiction. Secondary sanctions have been of increasing importance in recent years, particularly (but not only) with respect to Russia and Iran. Although many U.S. secondary sanctions (including those focused on the energy and banking sectors generally) were suspended following implementation of the 2015 Joint Comprehensive Plan of Action, or the JCPOA, between the five permanent United Nations Security Council members, Germany, and Iran, pursuant to which Iran agreed to limits on its nuclear program in return for sanctions relief, a number of U.S. secondary sanctions programs targeting Iran remain in place, as does a comprehensive ban on dealings with Iran under direct sanctions. Iran has also been designated as a “jurisdiction of primary money laundering concern” under Section 311 of the USA PATRIOT Act, potentially subjecting banks dealing with Iranian financial institutions to increased regulatory scrutiny.

Violations of OFAC sanctions via transactions with a U.S. jurisdictional nexus can result in substantial civil or criminal penalties. A range of sanctions may be imposed on companies that engage in sanctionable activities within the scope of the remaining U.S. secondary sanctions, including, among other things, the blocking of any property subject to U.S. jurisdiction in which the sanctioned company has an interest, which would include a prohibition on transactions or dealings within U.S. jurisdiction involving securities of the sanctioned company. Financial institutions engaging in targeted activity could in some instances be sanctioned by termination or restriction of their ability to maintain correspondent accounts in the United States. The imposition of sanctions against foreign financial institutions pursuant to the remaining U.S. secondary sanctions is not automatic, requiring further action by the U.S. administration.

In 2017, we engaged in the following activities relating to Iran:

• We operate certain accounts for CBI, which were opened by CBI pursuant to a service agreement entered into by us and CBI in September 2010, as amended from time to time, to facilitate trade between Korea and Iran. The accounts opened by CBI consist of Won-denominated accounts that are used for the settlement of exports of goods produced or substantially transformed in Korea to Iran by Korean exporters and Won, U.S. dollar, euro and Japanese Yen-denominated accounts (of which only the Won accounts are in use) that are used for the settlement of imports of crude oil and natural gas from Iran by Korean importers. By the terms of the service agreement between us and CBI, settlement of export and import transaction payments due from Iranian entities to Korean exporters or from Korean importers to Iranian entities through such accounts opened by CBI are effected by crediting or debiting the relevant amount to or from the applicable accounts while a corresponding payment of funds is made to or from an Iranian bank by CBI. Any funds deposited for the account of Iranian entities as a result of Korean imports of crude oil and natural gas may only be used by transferring them to the Won-denominated account and then making payment to accounts of Korean persons and entities opened at financial institutions in Korea in respect of Korean exports to Iran. No transfers of funds may be made from these accounts to Iran, to Iranian accounts in any third country, or for any use other than those described above. In 2017, the total fee revenue from maintaining the CBI accounts amounted to approximately ￦168 million (which represented approximately 0.002% of our total revenue). As there were no expenses directly applicable to such activities under our internal management accounts, we estimate that our net income before tax from maintaining the CBI accounts also amounted to approximately ￦168 million (which represented approximately 0.009% of our total net income before tax). We intend to continue maintaining the accounts opened by CBI, and in light of the lifting of certain sanctions against Iran, including U.S. secondary sanctions, the scope of our services provided to CBI may be adjusted to reflect such change in circumstances.

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• We also provide limited export-import financing services to Korean exporters and importers in connection with their trade transactions with Iran that were permitted under the relevant Korean sanctions and were not subject to U.S. secondary sanctions, primarily by discounting, advising on or issuing letters of credit, and to a lesser extent, issuing performance bonds on behalf of Korean contractors with respect to Iranian construction projects permitted under the relevant Korean sanctions and not subject to U.S. secondary sanctions. All such transactions are settled through the accounts opened by CBI with us as described above. In 2017, our total fee revenue from such export-import financing services amounted to approximately ￦13.6 billion (which represented approximately 0.13% of our total revenue), while our net income before tax from such activities (net of expenses directly applicable to such activities based on our internal management accounts) amounted to approximately ￦4.4 billion (which represented approximately 0.23% of our total net income before tax). We intend to continue providing the export-import financing services with its current scope, to the extent U.S. secondary sanctions or other applicable sanctions remain lifted.

• We also maintain a limited number of deposit accounts in Korea for an Iranian financial institution that the U.S. government has historically viewed as controlled by the government of Iran. These accounts were opened with us before the institution was designated for U.S. sanctions. Under Korean customer protection requirements, we are unable to provide specific information identifying this Iranian financial institution or the volume of its deposits. In 2017, there were nominal fee revenues from maintaining such deposit accounts, and there were no expenses directly applicable to such activities under our internal management accounts.

• In May 2016, we established a new representative office in Tehran, Iran, which only engages in the collection of local market information and did not generate any revenue in 2017.

In addition, pursuant to requests from the U.S. government received in 2015, and authorization from the competent Korean authorities, we released US$490 million each on four different occasions, or a total of US$1,960 million, from the Won-denominated accounts of CBI maintained by us to the accounts of CBI located outside Korea. We understand that such requests were in furtherance of an interim Joint Plan of Action agreed between the five permanent United Nations Security Council members and Germany, and Iran in November 2013.

We do not believe that our activities relating to Iran violate OFAC sanctions or are sanctionable under U.S. secondary sanctions. Nevertheless, there is no guarantee that our activities relating to Iran will not be found to violate OFAC sanctions or involve sanctionable activity under the remaining U.S. secondary sanctions, or that any other government will not determine that our activities violate applicable sanctions of other countries. The Trump Administration has threatened to abandon the JCPOA, and the re-imposition or “snap-back” of previous U.S. sanctions (or imposition of new sanctions) could occur. While we do not expect that sanctions would be retroactively applied to activities properly engaged in while sanctions relief was in effect, it is possible that we would be forced to choose between breaching ongoing commitments or engaging in sanctionable activity. Sanctions against Iran are evolving rapidly, and future changes in law could also adversely affect us.

Our business and reputation could be adversely affected if the U.S. government were to determine that our activities relating to Iran violate OFAC sanctions or involve sanctionable activity under the U.S. secondary sanctions, or if any other government were to determine that our activities violate applicable sanctions of other countries. Any prohibition or conditions placed on our use of U.S. correspondent accounts could effectively eliminate our access to the U.S. financial system, including U.S. dollar clearing transactions, which would adversely affect our business, and any other sanctions or civil or criminal penalties imposed could also adversely affect our business. If the U.S. government were to challenge the compatibility of our activities relating to Iran with the OFAC sanctions or the U.S. secondary sanctions, while no assurances can be given that any such measures would be successful, we intend to take all necessary measures to the extent possible to ensure that prohibitions or conditions are not placed on our use of U.S. correspondent accounts, including closing the accounts opened by CBI with us, if required.

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We are cooperating with an investigation led by the U.S. Attorney’s Office for the Southern District of New York and the New York State Office of the Attorney General on certain of our transactions involving sanctioned countries under the U.S. sanctions and other U.S. laws, by producing information and documents pursuant to the applicable laws and regulations. It is not possible to predict the outcome of such investigation at this time, and there can be no assurance that such investigation will not result in an unfavorable outcome or adversely affect our business or reputation. Furthermore, beginning in October 2014, the Prosecutors’ Office of Korea investigated a scheme by which the representative director of a Korean company and one of our employees engaged in fraudulent trade transactions involving our Won-denominated settlement activities through the CBI accounts. These individuals were arrested for, charged with and convicted of violations of the Foreign Exchange Transactions Law. The Prosecutors’ Office of Korea completed its investigation in connection with this incident and concluded that neither we nor our executive officers engaged in any wrongdoing. However, the fraudulent transactions in question did not meet the conditions attached to operation of the CBI accounts, and there can be no assurances that U.S. authorities would agree that we were not culpable or that the transactions would not be considered sanctionable.

Furthermore, some of our U.S. investors may be required to divest their investments in us under the laws of certain U.S. states or under internal investment policies relating to companies doing business with Iran or may decide for reputational reasons to divest such investments, and some U.S. institutional investors may forego the purchase of our securities. We are aware of initiatives by U.S. governmental entities and U.S. institutional investors, such as pension funds, to adopt or consider adopting laws, regulations or policies prohibiting transactions with or investment in, or requiring divestment from, entities doing business with countries identified as state sponsors of terrorism. There can be no assurance that the foregoing will not occur or that such occurrence will not have a material adverse effect on the value of our common stock and ADSs.

Our operations may be subject to increasing and continually evolving cybersecurity and other technological risks.

With the proliferation of new technologies and the increasing use of the Internet and mobile devices to conduct financial transactions, our operations as a financial institution have been, and will continue to be, subject to an increasing risk of cyber incidents relating to these activities, the nature of which is continually evolving. Our computer systems, software and networks are subject to cyber incidents, such as disruptions, delays or other difficulties affecting our information technology systems, computer viruses or other malicious codes, loss or destruction of data (including confidential client information), unauthorized access, account takeover attempts and cyber attacks. A significant portion of our daily operations relies on our information technology systems, including customer service, billing, the secure processing, storage and transmission of confidential and other information as well as the timely monitoring of a large number of complex transactions. Although we have made substantial and continuous investments to build systems and defenses to address cybersecurity and other technological risks, there is no guarantee that such measures or any other measures can provide adequate security and stability. In addition, because methods used to cause cyber attacks change frequently or, in some cases, are not recognized until launched, we may be unable to implement effective preventive measures or proactively address these methods. Furthermore, these cyber threats may arise from human error, accidental technological failure and third parties with whom we do business. If we were to be subject to a system failure or other cyber incident, it could result in the disclosure of confidential client information, damage to our reputation with our customers and in the market, customer dissatisfaction, additional costs to us, regulatory penalties, exposure to litigation and other financial losses to both us and our customers, which could have an adverse effect on our business and results of operations.

Our business may be adversely affected by legal claims and regulatory actions against us.

We are subject to the risk of legal claims and regulatory actions, which may expose us to monetary damages and legal costs, injunctive relief, criminal and civil penalties, sanctions against our management and employees and regulatory restrictions on our operations, as well as reputational harm. See “Item 8.A. Consolidated Statements and Other Financial Information—Legal Proceedings.”

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We are unable to predict the outcome of many of the legal claims and regulatory actions in which we are involved, and the scope of the claims or actions or the total amount in dispute in such matters may increase. Furthermore, adverse decisions, findings or resolutions in such matters could encourage other parties, including governmental authorities in other jurisdictions, to bring similar claims and actions against us. Accordingly, the outcome of current and future legal claims and regulatory actions, particularly those for which it is difficult to assess the maximum potential exposure or the ultimate adverse impact with any degree of certainty, may materially and adversely impact our business, reputation, results of operations and financial condition.

We are generally subject to Korean corporate governance and disclosure standards, which differ in significant respects from those in other countries.

Companies in Korea, including us, are subject to corporate governance standards applicable to Korean public companies which differ in many respects from standards applicable in other countries, including the United States. As a reporting company registered with the U.S. Securities and Exchange Commission and listed on the New York Stock Exchange, we are subject to certain corporate governance standards as mandated by the Sarbanes-Oxley Act of 2002. However, foreign private issuers, including us, are exempt from certain corporate governance requirements under the Sarbanes-Oxley Act or under the rules of the New York Stock Exchange. There may also be less publicly available information about Korean companies, such as us, than is regularly made available by public or non-public companies in other countries. Such differences in corporate governance standards and less public information could result in less than satisfactory corporate governance practices or disclosure to investors in certain countries.

The Korean regulatory authorities have imposed sanctions against Deloitte Anjin LLC, which may adversely affect its ability to continue to provide audit and related services to us and to satisfy any claims that may arise in relation to such services.

On April 5, 2017, the Financial Services Commission imposed sanctions against Deloitte Anjin LLC in connection with its role as the independent auditor for Daewoo Shipbuilding & Marine Engineering Co., Ltd., which was under investigation for alleged accounting irregularities. The sanctions included a prohibition against entering into new audit engagements for the year ending December 31, 2017 until April 5, 2018, a period of one year from the date of final determination of such sanctions. There are currently no restrictions on Deloitte Anjin’s ability to bid for and enter into audit engagements for the fiscal year beginning January 1, 2018. We are not in a position to assess whether any additional damages will be imposed, including those resulting from related on-going civil proceedings against Deloitte Anjin LLC.

Our access to the capital markets and our ability to make timely filings with the U.S. Securities and Exchange Commission and the Financial Supervisory Service (including the filing of annual and quarterly business reports and any registration statements for public offerings of securities) could be impaired if, for whatever reason, Deloitte Anjin LLC is unable to perform required audit and related services for us. It is possible that events arising out of the aforementioned legal proceedings may adversely affect the ability of Deloitte Anjin LLC to complete its audit engagement with us or to satisfy any claims relating to its provision of audit and related services to us, including claims that may arise out of Deloitte Anjin LLC’s audit of our consolidated financial statements included elsewhere in this annual report.

Risks relating to government regulation and policy

Strengthening of consumer protection laws applicable to financial institutions could adversely affect our operations.

As a financial service provider, we are subject to a variety of regulations in Korea that are designed to protect financial consumers. In recent years, in light of heightened public concern regarding privacy issues, the Korean government has placed greater emphasis on protection of personal information by financial institutions and has implemented a number of measures to enhance consumer protection. Under the Personal Information Protection Act, as last amended in July 2017, financial institutions, as personal information managers, may not

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collect, store, maintain, utilize or provide resident registration numbers of their customers, unless other laws or regulations specifically require or permit the management of resident registration numbers. In addition, under the Use and Protection of Credit Information Act, as last amended in November 2017, a financial institution has a higher duty to protect all information that it collects from its customers and is required to treat such information as credit information. A financial institution’s ability to transfer or provide the information to its affiliates or holding company is considerably restricted. Treble damages may be imposed on a financial institution for leakage of such information. Furthermore, under the Electronic Financial Transaction Act, as last amended in July 2017, a financial institution is primarily responsible for compensating its customers harmed by a cyber security breach affecting the financial institution even if the breach is not directly attributable to the financial institution.

In June 2016, the Financial Services Commission proposed the enactment of the Act on the Financial Consumer Protection Framework, which was submitted to the Korean National Assembly in May 2017. If the Act is adopted as proposed, we as a financial instrument distributor will be subject to heightened investor protection measures, including stricter distribution guidelines, improved financial dispute resolution procedures, increased liability for customer losses and newly imposed penalty surcharges.

These and other measures that may be implemented by the Korean government to strengthen consumer protection laws applicable to financial institutions may limit our operational flexibility and cause us to incur significant additional compliance costs, as well as subject us to increased potential liability to our customers, which could adversely affect our business and performance.

The Korean government may promote lending and financial support by the Korean financial industry to certain types of borrowers as a matter of policy, which financial institutions, including us, may decide to follow.

Through its policy guidelines and recommendations, the Korean government has promoted and, as a matter of policy, may continue to attempt to promote lending by the Korean financial industry to particular types of borrowers. For example, the Korean government has in the past announced policy guidelines requesting financial institutions to participate in remedial programs for troubled corporate borrowers, as well as policies aimed at promoting certain sectors of the economy, including measures such as making low interest funding available to financial institutions that lend to these sectors. The government has in this manner encouraged mortgage lending to low-income individuals and lending to small- and medium-sized enterprises. We expect that all loans or credits made pursuant to these government policies will be reviewed in accordance with our credit approval procedures. However, these or any future government policies may influence us to lend to certain sectors or in a manner in which we otherwise would not in the absence of such policies.

In the past, the Korean government has also announced policies under which financial institutions in Korea are encouraged to provide financial support to particular sectors. For example, in light of the deteriorating financial condition and liquidity position of small- and medium-sized enterprises in Korea and adverse conditions in the Korean economy affecting such enterprises, the Korean government introduced measures intended to encourage Korean banks to provide financial support to small- and medium-sized enterprise borrowers. See “—Risks relating to our corporate credit portfolio—The largest portion of our exposure is to small- and medium-sized enterprises, and financial difficulties experienced by companies in this segment may result in a deterioration of our asset quality and have an adverse impact on us.” In addition, in March 2015, in response to increasing levels of consumer debt and amid concerns over the debt-servicing capacity of retail borrowers if interest rates were to rise, the Korean government requested Korean banks to participate in a mortgage loan refinancing program aimed at reducing the payment burden on and improving the asset quality of outstanding mortgage loans. See “—Risks relating to our consumer credit portfolio—We may experience increases in delinquencies in our consumer loan and credit card portfolios.”

The Korean government may in the future request financial institutions in Korea, including us, to make investments in or provide other forms of financial support to particular sectors of the Korean economy as a matter of policy, which financial institutions, including us, may decide to accept. We may incur costs or losses as a result of providing such financial support.

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The Financial Services Commission may impose burdensome measures on us if it deems us to be financially unsound.

If the Financial Services Commission deems our financial condition to be unsound, or if we fail to meet applicable regulatory standards, such as minimum capital adequacy and liquidity ratios, the Financial Services Commission may order or recommend, among other things:

• admonitions or warnings with respect to our officers;

• capital increases or reductions;

• assignments of contractual rights and obligations relating to financial transactions;

• a suspension of performance by our officers of their duties and the appointment of receivers;

• disposals of property holdings or closures of subsidiaries or branch offices or downsizing;

• stock cancellations or consolidations;

• mergers with other financial institutions;

• acquisition of us by a third party; and

• suspensions of a part or all of our business operations.

If any of these measures are imposed on us by the Financial Services Commission, they could hurt our business, results of operations and financial condition. In addition, if the Financial Services Commission orders us to partially or completely reduce our capital, you may lose part or all of your investment.

Our income tax expenses may increase as a result of changes to Korean corporate income tax laws.

Pursuant to an amendment to the Corporate Income Tax Law of Korea which became effective in January 2018, the corporate income tax rate applicable to the portion of the tax base of companies that exceeds ￦300 billion has been raised from 24.2% to 27.5%, inclusive of local income surtax in each case. In addition, pursuant to an amendment to the Special Tax Treatment Control Law of Korea which became effective in January 2018, large corporations with net equity in excess of ￦50 billion, including us and certain of our subsidiaries, are subject to a 20% additional levy on the unused amount if a certain portion (i.e., 65% or 15%, depending on the taxation method) of their taxable income is not used for investments or wage increases. Such changes in Korean income tax laws may result in an increase in our and our subsidiaries’ income tax expenses, which, depending on the magnitude of such increase, may have a material adverse effect on our results of operations.

Risks relating to Korea

Unfavorable financial and economic developments in Korea may have an adverse effect on us.

We are incorporated in Korea, and a substantial majority of our operations are located in Korea. As a result, we are subject to political, economic, legal and regulatory risks specific to Korea. The economic indicators in Korea in recent years have shown mixed signs of growth and uncertainty, and future growth of the Korean economy is subject to many factors beyond our control, including developments in the global economy.

In recent years, adverse conditions and volatility in the worldwide financial markets, fluctuations in oil and commodity prices and the general weakness of the global economy have contributed to the uncertainty of global economic prospects in general and have adversely affected, and may continue to adversely affect, the Korean economy. See “—Other risks relating to our business—Unfavorable changes in the global financial markets could adversely affect our results of operations and financial condition.” The value of the Won relative to major foreign currencies has fluctuated significantly. See “Item 3.A. Selected Financial Data—Exchange Rates.” Furthermore, as a result of changing global and Korean economic conditions, there has been volatility in the stock prices of Korean companies in recent years. Future declines in the Korea Composite Stock Price Index, known as the KOSPI, and large amounts of sales of Korean securities by foreign investors and subsequent repatriation of the proceeds of such sales may adversely affect the value of the Won, the foreign currency

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reserves held by financial institutions in Korea, and the ability of Korean companies to raise capital. Any future deterioration of the Korean or global economy could adversely affect our business, financial condition and results of operations.

Developments that could have an adverse impact on the Korean economy include:

• adverse conditions or uncertainty in the economies of countries and regions that are important export markets for Korea, such as China, the United States, Europe and Japan, or in emerging market economies in Asia or elsewhere, as well as increased uncertainty in light of a future Brexit;

• adverse changes or volatility in foreign currency reserve levels, commodity prices (including oil prices), exchange rates (including fluctuation of the U.S. dollar, the euro or the Japanese yen exchange rates or revaluation of the Chinese renminbi), interest rates, inflation rates or stock markets;

• deterioration in economic or diplomatic relations between Korea and its trading partners or allies, including deterioration resulting from territorial or trade disputes or disagreements in foreign policy (such as the controversy between Korea and China, which is Korea’s largest export market, regarding the deployment of a Terminal High Altitude Area Defense system in Korea by the United States in March 2017 and the ensuing economic and other retaliatory actions by China);

• increased sovereign default risks in select countries and the resulting adverse effects on the global financial markets;

• the investigations of several Korean conglomerates and their senior management for bribery, embezzlement and other possible misconduct relating to the impeachment and dismissal of former President Park Geun-hye;

• a continuing rise in the level of household debt and increasing delinquencies and credit defaults by consumer or small- and medium-sized enterprise borrowers in Korea;

• declines in consumer confidence and a slowdown in consumer spending in the Korean or global economy;

• social and labor unrest;

• decreases in the market prices of Korean real estate;

• the economic impact of any pending or future free trade agreements or of any changes to existing free trade agreements;

• a decrease in tax revenue and a substantial increase in the Korean government’s expenditures for fiscal stimulus measures, unemployment compensation and other economic and social programs that, together, would lead to an increased government budget deficit;

• financial problems or lack of progress in the restructuring of chaebols, other large troubled companies (including those in the construction, shipbuilding and shipping sectors) and their suppliers;

• loss of investor confidence arising from corporate accounting irregularities, allegations of corruption and corporate governance issues concerning certain chaebols;

• increases in social expenditures to support an aging population in Korea or decreases in economic productivity due to the declining population size in Korea;

• geo-political uncertainty and the risk of further attacks by terrorist groups around the world;

• natural or man-made disasters that have a significant adverse economic or other impact on Korea or its major trading partners;

• the occurrence of severe health epidemics in Korea or other parts of the world (such as the Middle East Respiratory Syndrome outbreak in Korea in 2015);

• political uncertainty or increasing strife among or within political parties in Korea;

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• hostilities or political or social tensions involving oil producing countries in the Middle East and Northern Africa and any material disruption in the global supply of oil or sudden increase in the price of oil;

• an increase in the level of tensions or an outbreak of hostilities between North Korea and Korea or the United States; and

• changes in financial regulations in Korea.

Escalations in tensions with North Korea could have an adverse effect on us and the market price of our ADSs.

Relations between Korea and North Korea have been tense throughout Korea’s modern history. The level of tension between the two Koreas has fluctuated and may increase abruptly as a result of current and future events. In particular, there have been heightened security concerns in recent years stemming from North Korea’s nuclear weapon and ballistic missile programs as well as its hostile military actions against Korea. Some of the significant incidents in recent years include the following:

• North Korea renounced its obligations under the Nuclear Non-Proliferation Treaty in January 2003 and conducted six rounds of nuclear tests since October 2006, including claimed detonations of hydrogen bombs, which are more powerful than plutonium bombs, and warheads that can be mounted on ballistic missiles. Over the years, North Korea has also conducted a series of ballistic missile tests, including missiles launched from submarines and intercontinental ballistic missiles that it claims can reach the United States mainland. In response, the Korean government has repeatedly condemned the provocations and flagrant violations of relevant United Nations Security Council resolutions. In February 2016, the government also closed the inter-Korea Gaeseong Industrial Complex in response to North Korea’s fourth nuclear test in January 2016. Internationally, the United Nations Security Council has passed a series of resolutions condemning North Korea’s actions and significantly expanding the scope of sanctions applicable to North Korea, most recently in December 2017, in response to North Korea’s intercontinental ballistic missile test in November 2017. Over the years, the United States and the European Union have also expanded their sanctions applicable to North Korea.

• In August 2015, two Korean soldiers were injured in a landmine explosion near the Korean demilitarized zone. Claiming the landmines were set by North Koreans, the Korean army reinitiated its propaganda program toward North Korea utilizing loudspeakers near the demilitarized zone. In retaliation, the North Korean army fired artillery rounds on the loudspeakers, resulting in the highest level of military readiness for both Koreas.

• In March 2010, a Korean naval vessel was destroyed by an underwater explosion, killing many of the crewmen on board. The Korean government formally accused North Korea of causing the sinking, while North Korea denied responsibility. Moreover, in November 2010, North Korea fired more than one hundred artillery shells that hit Korea’s Yeonpyeong Island near the Northern Limit Line, which acts as the de facto maritime boundary between Korea and North Korea on the west coast of the Korean peninsula, causing casualties and significant property damage. The Korean government condemned North Korea for the attack and vowed stern retaliation should there be further provocation.

North Korea’s economy also faces severe challenges, which may further aggravate social and political pressures within North Korea. Although a bilateral summit between the two Koreas was held on April 27, 2018 and there has been an announcement in March 2018 of a potential summit between the United States and North Korea, there can be no assurance that the level of tensions affecting the Korean peninsula will not escalate in the future. Any further increase in tensions, which may occur, for example, if North Korea experiences a leadership crisis, high-level contacts between Korea and North Korea break down or military hostilities occur, could have a material adverse effect on the Korean economy and on our business, financial condition and results of operations and the market value of our common stock and ADSs.

Labor unrest in Korea may adversely affect our operations.

Economic difficulties in Korea or increases in corporate reorganizations and bankruptcies could result in layoffs and higher unemployment. Such developments could lead to social unrest and substantially increase

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government expenditures for unemployment compensation and other costs for social programs. According to statistics from the Korea National Statistical Office, the unemployment rate increased from 3.6% in 2015 to 3.7% in 2016 and 2017. Further increases in unemployment and any resulting labor unrest in the future could adversely affect our operations, as well as the operations of many of our customers and their ability to repay their loans, and could adversely affect the financial condition of Korean companies in general, depressing the price of their securities. Furthermore, the government’s privatization plan with respect to us contemplates the sale of its remaining ownership interest in us to one or more third parties, which may lead to labor unrest among our employees. See “Item 4.A. History and Development of the Company—Privatization Plan.” Any of these developments may have an adverse effect on our financial condition and results of operations.

Risks relating to our common stock and ADSs

We or our major shareholders may sell shares of our common stock in the future, and such sales may adversely affect the market price of our common stock and ADSs and may dilute your investment and relative ownership interest in us.

We have no current plans for any public offerings of our common stock, ADSs or securities exchangeable for or convertible into such securities. However, it is possible that we may decide to offer or sell such securities in the future.

In addition, the KDIC currently owns 124,604,797 shares, or 18.43%, of our outstanding common stock, and IMM Private Equity, Inc., through its special purpose company Nobis1, Inc., currently owns 40,560,000 shares, or 6.00%, of our outstanding common stock. See “Item 7.A. Major Shareholders.” In the future, such major shareholders or any other shareholder that owns a large number of shares of our outstanding common stock may choose to sell large blocks of our common stock publicly or privately to a strategic or financial investor, including a sale by the KDIC for the purpose of recovering the public funds it injected into us. For example, in accordance with the Korean government’s privatization plan, the KDIC sold 40,143,022 shares of our common stock (representing 5.9% of our outstanding common stock) in a private sale in Korea in December 2014 and an aggregate of 200,685,395 shares of our common stock (representing 29.7% of our outstanding common stock) in stakes ranging from 3.7% to 6.0% to seven financial companies through a bidding process in December 2016 and January 2017. In 2017, pursuant to a series of transactions related to call options previously granted in connection with the KDIC’s sale of our common stock in December 2014, the KDIC sold an aggregate of 19,852,364 shares of our common stock (representing 2.94% of our outstanding common stock). As a result of such transactions, the KDIC’s ownership interest in us was reduced to 18.43%. See “—Risks relating to our structure and strategy—The implementation of the Korean government’s privatization plan may have an adverse effect on us and your interests as a shareholder.” We expect the KDIC to sell all or a portion of the remaining shares of our common stock it owns to one or more purchasers in the future.

Any future offerings or sales by us of our common stock or ADSs or securities exchangeable for or convertible into such securities, significant sales of our common stock by a major shareholder, or the public perception that such an offering or sale may occur, could have an adverse effect on the market price of our common stock and ADSs. Furthermore, any offerings by us in the future of any such securities could have a dilutive impact on your investment and relative ownership interest in us.

Ownership of our common stock is restricted under Korean law.

Under the Bank Act, a single shareholder, together with its affiliates, is generally prohibited from owning more than 10.0% of a nationwide bank’s total issued and outstanding shares with voting rights or more than 15.0% of a regional bank’s total issued and outstanding shares with voting rights, with the exception of certain shareholders that are non-financial business group companies, whose applicable limit was reduced from 9.0% to 4.0% pursuant to an amendment of the Bank Act which became effective on February 14, 2014. To the extent that the total number of shares of our common stock (including those represented by ADSs) that you and your affiliates own together exceeds the applicable limits, you will not be entitled to exercise the voting rights for the excess shares, and the Financial Services Commission may order you to dispose of the excess shares within a

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period of up to six months. Failure to comply with such an order would result in an administrative fine of up to 0.03% of the book value of such shares per day until the date of disposal. Non-financial business group companies may not acquire beneficial ownership of shares of a nationwide bank in excess of 4.0% of such bank’s outstanding voting shares, unless they obtain the approval of the Financial Services Commission and agree not to exercise voting rights in respect of shares in excess of the 4.0% limit, in which case they may acquire beneficial ownership of up to 10.0% of such nationwide bank’s outstanding voting shares. See “Item 4.B. Business Overview—Supervision and Regulation—Principal Regulations Applicable to Banks—Restrictions on Bank Ownership.” In addition, if the shareholding of any single shareholder, together with its affiliates, increases to a level exceeding the applicable limits as a result of a merger, such shareholder will be restricted from exercising its voting rights in respect of shares in excess of the applicable limit pursuant to the Bank Act from the effective date of the merger, and will be required to dispose of such excess shares within three years after such effective date.

You will not be able to exercise dissent and appraisal rights unless you have withdrawn the underlying shares of our common stock and become our direct shareholder.

In some limited circumstances, including the transfer of the whole or any significant part of our business and the merger or consolidation of us with another company, dissenting shareholders have the right to require us to purchase their shares under Korean law. However, if you hold our ADSs, you will not be able to exercise such dissent and appraisal rights if the depositary refuses to do so on your behalf. Our deposit agreement does not require the depositary to take any action in respect of exercising dissent and appraisal rights. In such a situation, holders of our ADSs must withdraw the underlying common stock from the ADS facility (and incur charges relating to that withdrawal) and become our direct shareholder prior to the record date of the shareholders’ meeting at which the relevant transaction is to be approved, in order to exercise dissent and appraisal rights.

You may be limited in your ability to deposit or withdraw common stock.

Under the terms of our deposit agreement, holders of common stock may deposit such stock with the depositary’s custodian in Korea and obtain ADSs, and holders of ADSs may surrender ADSs to the depositary and receive common stock. However, to the extent that a deposit of common stock exceeds any limit that we may specify from time to time, that common stock will not be accepted for deposit unless our consent with respect to such deposit has been obtained. We currently have not set any such limit; however, we have the right to do so at any time. Under the terms of the deposit agreement, no consent would be required if the shares of common stock were to be obtained through a dividend, free distribution, rights offering or reclassification of such stock. We have consented, under the terms of the deposit agreement, to any deposit unless the deposit would be prohibited by applicable laws or violate our articles of incorporation. If we choose to impose a limit on deposits in the future, however, we might not consent to the deposit of any additional common stock. In that circumstance, if you surrender ADSs and withdraw common stock, you may not be able to deposit the stock again to obtain ADSs. See “Item 9.C. Markets—Restrictions Applicable to Shares.”

You will not have preemptive rights in some circumstances.

The Korean Commercial Code, as amended, and our articles of incorporation require us, with some exceptions, to offer shareholders the right to subscribe for new shares of our common stock in proportion to their existing shareholding ratio whenever new shares are issued. If we offer any rights to subscribe for additional shares of our common stock or any rights of any other nature, the depositary, after consultation with us, may make the rights available to holders of our ADSs or use commercially feasible efforts to dispose of the rights on behalf of such holders, in a riskless principal capacity, and make the net proceeds available to such holders. The depositary will make rights available to holders of our ADSs only if:

• we have requested in a timely manner that those rights be made available to such holders;

• the depositary has received the documents that are required to be delivered under the terms of the deposit agreement, which may include confirmation that a registration statement filed by us under the

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U.S. Securities Act of 1933, as amended, or the Securities Act, is in effect with respect to those shares or that the offering and sale of those shares is exempt from or is not subject to the registration requirements of the Securities Act; and

• the depositary determines, after consulting with us, that the distribution of rights is lawful and commercially feasible.

Holders of our common stock located in the United States may not exercise any rights they receive absent registration or an exemption from the registration requirements under the Securities Act.

We are under no obligation to file any registration statement with the U.S. Securities and Exchange Commission or to endeavor to cause such a registration statement to be declared effective. Moreover, we may not be able to establish an exemption from registration under the Securities Act. Accordingly, you may be unable to participate in our rights offerings and may experience dilution in your holdings. If a registration statement is required for you to exercise preemptive rights but is not filed by us or is not declared effective, you will not be able to exercise your preemptive rights for additional ADSs and you will suffer dilution of your equity interest in us. If the depositary is unable to sell rights that are not exercised or not distributed or if the sale is not lawful or feasible, it will allow the rights to lapse, in which case you will receive no value for these rights.

Your dividend payments and the amount you may realize upon a sale of your ADSs will be affected by fluctuations in the exchange rate between the U.S. dollar and the Won.

Our common stock is listed on the KRX KOSPI Market and quoted and traded in Won. Cash dividends, if any, in respect of the shares represented by the ADSs will be paid to the depositary in Won and then converted by the depositary into U.S. dollars, subject to certain conditions. Accordingly, fluctuations in the exchange rate between the Won and the U.S. dollar will affect, among other things, the amounts you will receive from the depositary in respect of dividends, the U.S. dollar value of the proceeds that you would receive upon a sale in Korea of the shares of our common stock obtained upon surrender of ADSs and the secondary market price of ADSs. Such fluctuations will also affect the U.S. dollar value of dividends and sales proceeds received by holders of our common stock.

The market value of your investment may fluctuate due to the volatility of, and government intervention in, the Korean securities market.

Our common stock is listed on the KRX KOSPI Market, which has a smaller market capitalization and is more volatile than the securities markets in the United States and many European countries. The market value of ADSs may fluctuate in response to the fluctuation of the trading price of shares of our common stock on the KRX KOSPI Market. The KRX KOSPI Market has experienced substantial fluctuations in the prices and volumes of sales of listed securities and the KRX KOSPI Market has prescribed a fixed range in which share prices are permitted to move on a daily basis. The KOSPI was 2,476.33 on April 20, 2018. There is no guarantee that the stock prices of Korean companies will not decline again in the future. Like other securities markets, including those in developed markets, the Korean securities market has experienced problems including market manipulation, insider trading and settlement failures. The recurrence of these or similar problems could have a material adverse effect on the market price and liquidity of the securities of Korean companies, including our common stock and ADSs, in both the domestic and the international markets.

The Korean government has the potential ability to exert substantial influence over many aspects of the private sector business community, and in the past has exerted that influence from time to time. For example, the Korean government has induced mergers to reduce what it considers excess capacity in a particular industry and has also induced private companies to publicly offer their securities. Similar actions in the future could have the effect of depressing or boosting the Korean securities market, whether or not intended to do so. Accordingly, actions by the government, or the perception that such actions are taking place, may take place or has ceased, may cause sudden movements in the market prices of the securities of Korean companies in the future, which may affect the market price and liquidity of our common stock and ADSs.

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If the Korean government deems that emergency circumstances are likely to occur, it may restrict you and the depositary from converting and remitting dividends and other amounts in U.S. dollars.

If the Korean government deems that certain emergency circumstances, including, but not limited to, severe and sudden changes in domestic or overseas economic circumstances, extreme difficulty in stabilizing the balance of payments or implementing currency, exchange rate and other macroeconomic policies, have occurred or are likely to occur, it may impose certain restrictions provided for under the Foreign Exchange Transaction Law, including the suspension of payments or requiring prior approval from governmental authorities for any transaction. See “Item 10.D. Exchange Controls—General.”

Other Risks

You may not be able to enforce a judgment of a foreign court against us.

We are a corporation with limited liability organized under the laws of Korea. Substantially all of our directors and officers and other persons named in this annual report reside in Korea, and all or a significant portion of the assets of our directors and officers and other persons named in this annual report and a substantial majority of our assets are located in Korea. As a result, it may not be possible for you to effect service of process within the United States, or to enforce against them or us in the United States judgments obtained in United States courts based on the civil liability provisions of the federal securities laws of the United States. There is doubt as to the enforceability in Korea, either in original actions or in actions for enforcement of judgments of United States courts, of civil liabilities predicated on the United States federal securities laws.

Item 4. INFORMATION ON THE COMPANY

Item 4.A. History and Development of the Company

Overview

We were originally established in 1899 and operated as the Commercial Bank of Korea until 1998. In 1998, we were acquired by the KDIC and merged with another commercial bank, Hanil Bank, which had been established in 1932. We were the surviving entity in the merger and were renamed Hanvit Bank.

In March 2001, the KDIC established a financial holding company, Woori Finance Holdings, to consolidate its ownership interests in four commercial banks (including us), one merchant bank and a number of smaller financial institutions. See “—History.” We were renamed Woori Bank in 2002 and operated as a wholly-owned subsidiary of Woori Finance Holdings through October 2014. Woori Finance Holdings registered its common stock under Section 12(b) of the Exchange Act and listed ADSs representing its common stock on the New York Stock Exchange, in September 2003.

On November 1, 2014, Woori Finance Holdings merged with and into us, such that we remained as the surviving entity, and Woori Finance Holdings ceased to exist, after the merger. In connection with the merger, shareholders of Woori Finance Holdings received one share of our common stock for each share of common stock of Woori Finance Holdings they held. See “—Privatization Plan—Merger with Woori Finance Holdings.” The merger constituted a succession for purposes of Rule 12g-3(a) under the Exchange Act, such that our common stock was deemed registered under Section 12(b) of the Exchange Act by operation of Rule 12g-3(a). Following the merger, we file reports under the Exchange Act as the successor issuer to Woori Finance Holdings.

Our legal and commercial name is Woori Bank, and we are a commercial bank established under the laws of the Republic of Korea. Our registered office and corporate headquarters are located at 51, Sogong-ro, Jung-gu, Seoul, Korea. Our telephone number is 822-2002-3000. Our website address is http://www.wooribank.com.

History

Establishment of Woori Finance Holdings

In response to a financial and economic downturn in Korea beginning in late 1997, the Korean government announced and implemented a series of comprehensive policy packages to address structural weaknesses in the

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Korean economy and the financial sector. As part of these measures, on October 1, 1998, the KDIC purchased 95.0% of the outstanding shares of the Commercial Bank of Korea and 95.6% of the outstanding shares of Hanil Bank, and subsequently merged Hanil Bank into the Commercial Bank of Korea (which was renamed Hanvit Bank). These banks had suffered significant losses in 1997 and 1998. The Korean government took pre-emptive measures to ensure the survival of these and other banks as it believed that bank failures would have a substantial negative impact on the Korean economy.

In December 2000, the Korean government wrote down the capital of Hanvit Bank, as well as Kyongnam Bank, Kwangju Bank and Peace Bank of Korea, to zero. It accomplished this by having the Financial Services Commission issue a capital reduction order with respect to these banks pursuant to its regulatory authority. The Korean government also decided to recapitalize these banks by injecting public funds through the KDIC. In December 2000, the KDIC made initial capital injections to Hanvit Bank (￦2,764 billion), Kyongnam Bank (￦259 billion), Kwangju Bank (￦170 billion) and Peace Bank of Korea (￦273 billion), in return for new shares of those banks. The KDIC also agreed to make additional capital contributions, not involving the issuance of new shares, in the future, which were made in September 2001 to Hanvit Bank (￦1,877 billion), Kyongnam Bank (￦94 billion), Kwangju Bank (￦273 billion) and Peace Bank of Korea (￦339 billion).

In addition, in November 2000, the KDIC established Hanaro Merchant Bank to restructure substantially all of the assets and liabilities of four failed merchant banks (Yeungnam Merchant Banking Corporation, Central Banking Corporation, Korea Merchant Banking Corporation and H&S Investment Bank) that were transferred to it.

In March 2001, the KDIC established Woori Finance Holdings as a new financial holding company and transferred all of the shares in each of Hanvit Bank, Kyongnam Bank, Kwangju Bank, Peace Bank of Korea and Hanaro Merchant Bank held by the KDIC to Woori Finance Holdings in exchange for its newly issued shares. Accordingly, Woori Finance Holdings became the sole owner of those entities. Woori Finance Holdings subsequently listed its common stock on the KRX KOSPI Market in June 2002 and listed ADSs representing its common stock on the New York Stock Exchange in September 2003.

Our name was changed from Hanvit Bank to Woori Bank in May 2002.

Memoranda of Understanding

In connection with the recapitalization by the KDIC of the entities (including us) that became subsidiaries of Woori Finance Holdings and its establishment, such entities, Woori Finance Holdings and the KDIC entered into a number of memoranda of understanding, including the following.

Memoranda of Understanding between Woori Finance Holdings’ Subsidiaries and the KDIC. In December 2000, in connection with the capital contributions made by the KDIC into each of us, Kwangju Bank, Kyongnam Bank, Peace Bank of Korea and Hanaro Merchant Bank, these entities entered into separate memoranda of understanding with the KDIC that included business normalization plans. The memoranda of understanding were substantially identical with respect to each entity and primarily dealt with each entity’s obligation to implement a two-year business normalization plan covering 2001 and 2002. To the extent that any entity were to fail to implement its business normalization plan or to meet financial targets specified in the plan, the KDIC had the right to impose sanctions on that entity’s directors or employees, or to require the entity to take certain actions. In addition, each entity was required to take all actions necessary to enable it to return to the KDIC any public funds injected into them, so long as that action would not cause a material adverse effect on the normalization of business operations as contemplated by the memorandum of understanding.

Each entity prepared a two-year business normalization plan that was approved by the KDIC. Each plan included recapitalization goals and deadlines, econometric models, plans to dispose of non-performing loans, cost reduction initiatives, future management and business strategies and other restructuring plans. Each plan also set forth financial targets for each quarter of 2001 and 2002 that the applicable entity was required to meet.

Since 2000, we periodically entered into new business normalization plans with the KDIC, with new restructuring measures and financial targets. The other entities did so as well, until their merger or disposition by

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Woori Finance Holdings, pursuant to which their memoranda of understanding with the KDIC were terminated. See “—Privatization Plan.” Our memorandum of understanding with the KDIC was terminated in December 2016 in connection with the reduction in its ownership of our common stock from a majority stake to a minority stake after its sale of an aggregate of 200,685,395 shares of our common stock in December 2016 and January 2017. The KDIC’s current ownership interest in us is 18.43%. See “—Privatization Plan—Sales of the KDIC’s Ownership Interest.”

Memorandum of Understanding between Woori Finance Holdings and the KDIC. In July 2001, Woori Finance Holdings entered into a memorandum of understanding with the KDIC, which included a business normalization plan. Under this memorandum, Woori Finance Holdings was required to take all actions necessary (including making dividend payments and share buybacks and cancellations) to return the public funds injected into it by the KDIC, but only to the extent that these actions would not cause a material adverse effect on the contemplated normalization of its operations.

The business normalization plan included in the memorandum of understanding set financial targets for Woori Finance Holdings’ capital ratio, return on total assets, expense-to-revenue ratio, operating income per employee, non-performing loan ratio and holding company expense ratio, which it was required to meet on a semi-annual basis. Woori Finance Holdings periodically entered into a new business normalization plan with the KDIC, with new restructuring measures and financial targets. Woori Finance Holdings’ memorandum of understanding with the KDIC was terminated in connection with its merger with and into us in November 2014. See “—Privatization Plan—Merger with Woori Finance Holdings.”

Reorganization and Expansion Plans

Following its establishment and its acquisition of its subsidiaries, Woori Finance Holdings developed a reorganization and integration plan designed to reorganize the corporate structure of some of its subsidiaries and integrate its operations under a single management structure. As part of this plan:

• From December 2001 through February 2002, Peace Bank of Korea was restructured by:

• splitting off its commercial banking operations and merging them into us;

• changing the name of Peace Bank of Korea to Woori Credit Card; and

• transferring our credit card operations to Woori Credit Card.

• In March 2003, the credit card operations of Kwangju Bank were transferred to Woori Credit Card.

• In August 2003, Woori Investment Bank (formerly named Hanaro Merchant Bank) was merged with us.

In succeeding years, Woori Finance Holdings adopted plans to further reorganize and expand its operations, including through mergers, acquisitions and investments. Pursuant to such reorganization and expansion plans:

• In March 2004, Woori Credit Card was merged with us.

• In October and December 2004, Woori Finance Holdings acquired an aggregate 27.3% voting interest in LG Investment & Securities Co., Ltd., which was subsequently renamed Woori Investment & Securities.

• In May 2005, Woori Finance Holdings acquired a 90.0% interest in LG Investment Trust Management Co., Ltd., which was subsequently renamed Woori Asset Management.

• In October 2005, we established Woori Private Equity as a consolidated subsidiary.

• In April 2008, Woori Finance Holdings acquired a 51.0% interest in LIG Life Insurance Co., Ltd., which was subsequently renamed Woori Aviva Life Insurance.

• In March 2011, Woori Finance Holdings acquired certain assets and assumed certain liabilities of Samhwa Mutual Savings Bank through a newly established subsidiary, Woori FG Savings Bank.

• In September 2012, Woori FG Savings Bank acquired certain assets and assumed certain liabilities of Solomon Mutual Savings Bank.

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• In October 2012, Woori Finance Holdings established Woori Finance Research Institute, which engages in economic and finance research, management consulting, and management and sales of intellectual property rights.

• In April 2013, we effected a spin-off of our credit card business into a newly established wholly-owned subsidiary of Woori Finance Holdings, Woori Card.

• In June 2013, through an internal reorganization, Kumho Investment Bank (previously a subsidiary of Woori Private Equity and subsequently renamed Woori Investment Bank), in which Woori Finance Holdings held a 41.6% interest, became its consolidated subsidiary, and ￦70 billion of new capital was injected into such entity.

• In January 2014, we completed the purchase of an additional 27% equity interest (in addition to the 6% equity interest we previously acquired through our subsidiary PT. Bank Woori Indonesia) in PT. Bank Himpunan Saudara 1906, an Indonesian commercial bank with a network of over 100 branches and offices throughout Indonesia. In December 2014, PT. Bank Woori Indonesia merged with and into PT. Bank Himpunan Saudara 1906. The merged entity, in which we hold a 79.9% equity interest, was renamed PT Bank Woori Saudara Indonesia 1906, Tbk and became our consolidated subsidiary.

• In October 2016, we acquired a 51% equity interest in Wealth Development Bank Corp., a thrift bank in the Philippines with a network of 16 branches and approximately 300 employees, by purchasing newly issued shares for approximately US$21 million.

• In November 2016, we established a local subsidiary in Vietnam, Woori Bank Vietnam, which commenced operations in January 2017.

Privatization Plan

In June 2013, the Korean government, through the Public Funds Oversight Committee of the Financial Services Commission, announced an updated plan to privatize Woori Finance Holdings and its former subsidiaries, including us. The privatization plan provided for the segregation of such entities into three groups and the disposal of the Korean government’s interest in these entities held through the KDIC in a series of transactions, many of which have been completed.

Spin-off of Kwangju Bank and Kyongnam Bank

In August 2013, the board of directors of Woori Finance Holdings approved a plan to establish two new companies, KJB Financial Group and KNB Financial Group (which we refer to as the New Holdcos), through a spin-off (which we refer to as the Spin-off) of its businesses related to the holding of the shares and thereby controlling the business operations of Kwangju Bank and Kyongnam Bank, respectively. The Spin-off was approved at an extraordinary general meeting of the shareholders of Woori Finance Holdings held on January 28, 2014 and was effected on May 1, 2014. After the Spin-off, KJB Financial Group owned the shares of Kwangju Bank previously held by Woori Finance Holdings, and KNB Financial Group owned the shares of Kyongnam Bank previously held by Woori Finance Holdings. Woori Finance Holdings no longer owned any shares of Kwangju Bank or Kyongnam Bank, and neither they nor the New Holdcos were its subsidiaries, after the Spin-off. Following the Spin-off, each of these banks was merged with the relevant New Holdco.

As of December 31, 2013, Kwangju Bank had total assets of ￦18,873 billion (including total loans of ￦13,447 billion) and total liabilities of ￦17,429 billion (including total deposits of ￦13,531 billion), on a consolidated basis. For the year ended December 31, 2013, Kwangju Bank’s interest income amounted to ￦832 billion, its interest expense amounted to ￦417 billion and its net income amounted to ￦61 billion, on a consolidated basis. As of December 31, 2013, Kyongnam Bank had total assets of ￦31,714 billion (including total loans of ￦24,572 billion) and total liabilities of ￦29,454 billion (including total deposits of ￦23,773 billion), on a consolidated basis. For the year ended December 31, 2013, Kyongnam Bank’s interest income amounted to ￦1,324 billion, its interest expense amounted to ￦672 billion and its net income amounts to ￦130 billion, on a consolidated basis.

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The Spin-off was accomplished through a pro rata distribution of common stock, par value ￦5,000 per share, of KJB Financial Group and KNB Financial Group to the holders of Woori Finance Holdings’ common stock. Specifically, on May 21, 2014, each holder of Woori Finance Holdings’ common stock as of the record date of April 30, 2014 received 0.0637 shares of common stock of KJB Financial Group and 0.0973 shares of common stock of KNB Financial Group for each share of Woori Finance Holdings’ common stock held by such holder. Holders of Woori Finance Holdings’ ADSs did not receive any common stock of the New Holdcos in connection with the Spin-off. Instead, the depositary for Woori Finance Holdings’ American depositary receipts program sold the New Holdcos’ common stock it received in the Spin-off, in a riskless principal capacity, and distributed the net proceeds of such sale to holders of the ADSs, after deducting applicable fees and expenses of the depositary and applicable taxes and other governmental charges. Neither of the New Holdcos issued any ADSs or established any American depositary receipts program following the Spin-off.

As a result of the Spin-off, pursuant to share consolidation procedures under Korean law, the outstanding shares of Woori Finance Holdings’ common stock were consolidated as of May 1, 2014 such that the shareholders recorded in its shareholder register as of the record date of April 30, 2014 were allotted 0.8390 shares of its common stock in exchange for each previously outstanding share. Woori Finance Holdings’ outstanding ADSs were also consolidated as of May 1, 2014 such that holders of such ADSs recorded in the transfer books of the depositary as of the record date of April 30, 2014 were allotted 0.8390 ADSs in exchange for each previously outstanding ADS.

In October 2014, the KDIC sold its 56.97% ownership interest in Kwangju Bank and Kyongnam Bank to JB Financial Group and BS Financial Group, respectively.

Disposal of Woori Financial, Woori Asset Management, Woori F&I, Woori Investment & Securities, Woori Aviva Life Insurance and Woori FG Savings Bank

On March 20, 2014, Woori Finance Holdings sold its 52.0% ownership interest in Woori Financial to KB Financial Group for the sale price of ￦280 billion. As of December 31, 2013, Woori Financial had total assets of ￦3,940 billion and total liabilities of ￦3,528 billion on a consolidated basis. For the year ended December 31, 2013, Woori Financial’s operating revenues amounted to ￦338 billion, and its net income amounted to ￦54 billion, on a consolidated basis.

In May 2014, Woori Finance Holdings sold its 100.0% ownership interest in Woori Asset Management to Kiwoom Securities for the sale price of ￦76 billion. As of December 31, 2013, Woori Asset Management had total assets of ￦85 billion and total liabilities of ￦17 billion on a consolidated basis. For the year ended December 31, 2013, Woori Asset Management’s operating revenues amounted to ￦32 billion, and its net income amounted to ￦4 billion, on a consolidated basis.

In June 2014, Woori Finance Holdings sold its 100.0% ownership interest in Woori F&I to Daishin Securities for the sale price of ￦368 billion. As of December 31, 2013, Woori F&I had total assets of ￦1,641 billion and total liabilities of ￦1,336 billion on a consolidated basis. For the year ended December 31, 2013, Woori F&I’s operating revenues amounted to ￦184 billion, and its net income amounted to ￦49 billion, on a consolidated basis.

In June 2014, Woori Finance Holdings sold its 37.9% ownership interest in Woori Investment & Securities, its 51.6% ownership interest in Woori Aviva Life Insurance and its 100.0% ownership interest in Woori FG Savings Bank to NongHyup Financial Group Inc. for the sale price of ￦1,039 billion in a collective sale. As of December 31, 2013, Woori Investment & Securities, Woori Aviva Life Insurance and Woori FG Savings Bank had total assets of ￦29,982 billion, ￦4,466 billion and ￦823 billion, respectively, on a consolidated basis, and total liabilities of ￦26,534 billion, ￦4,309 billion and ￦699 billion, respectively, on a consolidated basis. For the year ended December 31, 2013, operating revenues of Woori Investment & Securities, Woori Aviva Life Insurance and Woori FG Savings Bank amounted to ￦4,027 billion, ￦982 billion and ￦85 billion, respectively, on a consolidated basis, and net income of Woori Investment & Securities and Woori Aviva Life Insurance amounted to ￦48 billion and ￦2 billion, respectively, on a consolidated basis. For the year ended December 31, 2013, Woori FG Savings Bank had a net loss of ￦34 billion.

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Merger with Woori Finance Holdings

In July 2014, we entered into a merger agreement with Woori Finance Holdings, providing for the merger of Woori Finance Holdings with and into us. The merger agreement was approved by the shareholders of Woori Finance Holdings at an extraordinary general meeting held on October 10, 2014. Pursuant to the merger agreement, Woori Finance Holdings merged with and into us on November 1, 2014, such that we remained as the surviving entity, and Woori Finance Holdings ceased to exist, after the merger. In connection with the merger, shareholders of Woori Finance Holdings recorded in its shareholder register as of November 1, 2014 received one share of our common stock for each share of common stock of Woori Finance Holdings they held.

As a result of the merger, the other remaining subsidiaries of Woori Finance Holdings, including Woori Card, Woori Private Equity, Woori FIS, Woori Investment Bank and Woori Finance Research Institute, became our subsidiaries. Accordingly, our overall business and operations after the merger, on a consolidated basis, are substantially identical to those of Woori Finance Holdings on a consolidated basis prior to the merger.

The following chart sets forth the corporate organization of Woori Finance Holdings and its subsidiaries prior to the merger:

The following chart sets forth our corporate organization following the merger:

We were an unlisted corporation prior to the merger, while Woori Finance Holdings had its common stock listed on the KRX KOSPI Market and its ADSs listed on the New York Stock Exchange. Following the merger, we became newly listed on the KRX KOSPI Market and succeeded to Woori Finance Holdings’ listing on the New York Stock Exchange.

The shareholders of Woori Finance Holdings were entitled to exercise appraisal rights with respect to its common stock held by them at a purchase price of ￦12,422 per share, in accordance with Korean law. The period for exercise of appraisal rights started on October 11, 2014 and ended on October 21, 2014, during which shareholders exercised appraisal rights with respect to an aggregate of 64,832 shares of common stock of Woori Finance Holdings. The payment of the purchase price for such common stock held by the exercising shareholders was made on October 30, 2014, in the aggregate amount of ￦805 million. Such common stock purchased by Woori Finance Holdings was exchanged for our common stock in the merger and are held by us as treasury shares. We are required under applicable Korean law to dispose of such treasury shares within five years after the date of their acquisition.

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Sales of the KDIC’s Ownership Interest

Pursuant to the Korean government’s privatization plan, in December 2014, the KDIC sold 40,143,022 shares of our common stock (representing 5.9% of our outstanding common stock) in a private sale in Korea. In addition, in December 2016 and January 2017, the KDIC sold an aggregate of 200,685,395 shares of our common stock (representing 29.7% of our outstanding common stock) in stakes ranging from 3.7% to 6.0% to seven financial companies through a bidding process. Pursuant to a commitment made by the KDIC in connection with such bidding process, five persons, each nominated by one of the winning bidders, were elected as new outside directors at an extraordinary general meeting of our shareholders held in December 2016. See “Item 6.A. Directors and Senior Management—Board of Directors—Outside Directors.” In 2017, pursuant to a series of transactions related to call options previously granted in connection with the KDIC’s sale of our common stock in December 2014, the KDIC sold an aggregate of 19,852,364 shares of our common stock (representing 2.94% of our outstanding common stock). As a result of such transactions, the KDIC’s ownership interest in us was reduced to 18.43%. We expect the KDIC to sell all or a portion of the remaining shares of our common stock it owns to one or more purchasers in the future.

In December 2016, in connection with the KDIC’s sale of shares of our common stock, we entered into an agreement with the KDIC, pursuant to which we are required to use our best efforts to cause an employee of the KDIC nominated by it to be appointed as our non-standing director, so long as the KDIC either (x) owns 10% or more of our total issued shares with voting rights or (y) owns more than 4% but less than 10% of our total issued shares with voting rights and remains our largest shareholder (other than the National Pension Service of Korea). See “Item 10.C. Material Contracts.”

Item 4.B. Business Overview

We are one of the largest commercial banks in Korea. Our operations include a broad range of businesses, including corporate banking, consumer banking, credit card operations, investment banking, capital markets activities and other businesses. We provide a wide range of products and services to our customers, which mainly comprise small- and medium-sized enterprises and individuals, as well as some of Korea’s largest corporations. As of December 31, 2017, we had, on a consolidated basis, total assets of ￦316,295 billion, total liabilities of ￦295,730 billion and total equity of ￦20,565 billion.

As one of the leading financial services groups in Korea, we believe our core competitive strengths include the following:

Strong and long standing relationships with corporate customers. Historically our operations concentrated on large corporate customers. As a result, we believe that we have strong relationships with many of Korea’s leading corporate groups, and we are the main creditor bank to 13 of the 36 largest Korean corporate borrowers. Further enhancing our corporate loan portfolio is our ability to lend to small- and medium-sized enterprise customers. As of December 31, 2017, we had approximately 280,129 small- and medium-sized enterprise borrowers.

Large and loyal retail customer base. With respect to our consumer banking operations, we have the third-largest deposit base among Korean commercial banks, and over 22.6 million retail customers, representing about half of the Korean adult population. Of these customers, over 9.2 million are active customers, meaning that they have a deposit account with us with a balance of at least ￦300,000 or have a loan account with us.

Extensive distribution and marketing network. We serve our customers primarily through one of the largest banking networks in Korea, comprising 876 branches and 5,952 ATMs and cash dispensers as of December 31, 2017. We also operate 10 dedicated corporate banking centers and 84 general managers for our large corporate customers and 1,009 relationship managers stationed at 726 branches (as well as 615 additional non-stationed employees who serve as relationship managers as needed) for our small- and medium-sized enterprise customers as of December 31, 2017. In addition, we have Internet and mobile banking platforms to enhance customer convenience, reduce service delivery costs and allow our branch staff to focus on marketing and sales.

Strong capital base. As of December 31, 2017, our consolidated equity totaled ￦20.6 trillion, and our total capital adequacy ratio was 15.40%. Our management team carefully coordinates our capital and dividend plans to

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ensure that we optimize our capital position. We believe our strong capital base and coordinated capital management enable us to support growth of our core businesses and to pursue franchise-enhancing initiatives such as selective investments and acquisitions.

Strong and experienced management team. We benefit from our management team’s extensive experience accumulated with us and our predecessors. In December 2017, Tae-Seung Sohn assumed the role of our president and chief executive officer. We believe that the extensive experience of many members of our management team in the financial sector will help us to continue to strengthen our operations.

Strategy

We aim to continue to build our position as a leading universal banking and financial services company in Korea, with a view to having our business platform and operating structure on par with those of leading global financial institutions. The key elements of our strategy are as follows:

Further improve our asset quality and strengthen our risk management practices. We were one of the earliest and most aggressive banks in Korea to actively reduce non-performing loans through charge-offs and sales to third parties, and we have taken various measures to facilitate the disposal of our substandard or below loans. As a result of these and other initiatives, our ratio of non-performing loans to total loans has been steadily declining and was 0.73% as of December 31, 2017.

One of our highest priorities is to maintain our strong asset quality and enhance our risk management practices on an ongoing basis. We created a centralized risk management organization, installed a comprehensive warning and monitoring system, adopted uniform loan loss provisioning policies and implemented an advanced credit evaluation system called “CREPIA.” We have undertaken a series of reviews of our credit risk management procedures, as well as our risk management infrastructure, in order to develop and implement various measures to further standardize and improve our risk management procedures and systems.

In addition, we use a value at risk, or “VaR,” monitoring system for managing market risk. We intend to vigorously maintain a manageable risk profile and balance that risk profile with adequate returns. We believe that our continuous focus on upgrading our risk management systems and practices will enable us to maintain our strong asset quality, improve our financial performance and enhance our competitiveness.

Enhance customer profitability through optimization of channel usage, products and services for each customer segment. Our extensive distribution network and wide range of quality products and services has enabled us to serve our customers effectively. However, we intend to further enhance the value proposition to our customers by differentiating products and delivery channels based on the distinct needs of different customer segments.

Retail customers. We have segmented our retail customers into four groups: high net worth; mass affluent; middle class; and mass market. We believe we are relatively competitive in our core customer base, which includes mass affluent and middle class customers, and we serve these customers via our team of financial planners in our branches who sell customized higher margin services and products, such as investment advice, mutual funds, insurance and personal loans. For our mass market customers, we offer simple, easy-to-understand and relatively more standardized products such as basic deposit and lending products, including mortgage loans, and we encourage the use of alternative distribution channels such as the Internet, mobile banking and ATMs by our mass market customers such that we can serve them in a cost efficient manner. We serve our high net worth individuals via branches and dedicated private banking centers staffed with experienced private bankers who offer sophisticated tailored financial services.

Corporate customers. We continuously and vigorously review our portfolio of large corporate and small- and medium-sized enterprise customers to refine our database of core accounts and industries in terms of profitability potential. We seek to expand our relationship beyond a pure lending relationship by promoting our foreign exchange, factoring, trade finance and investment banking services to our core small- and medium-sized enterprise customers and cross-selling our investment banking services, derivatives and other risk hedging products, as well as employee retirement products, to our core large corporate customers.

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Diversify our revenue base with a view to reducing our exposure to interest rate cycles and increasing profitability. Currently, in line with the Korean banking industry, we derive a substantial majority of our revenues from our loan and other credit products. To reduce our traditional reliance on lending as a source of revenue and to increase our profitability, we have been seeking to further diversify our earnings base, in particular by focusing on fee-based services, such as foreign exchange, trade finance and derivatives products, investment banking and advisory investment trust services for our corporate customers and asset management and mutual funds, investment trust products and beneficiary certificates, and life and non-life insurance products for our retail customers.

In addition, we intend to continue to enter into business alliances with other leading financial service providers so that we can offer a full range of “best of class” products and services to our targeted customers. We actively evaluate alliances and joint venture opportunities when they arise in order to diversify our revenue stream and provide our customers with a range of sophisticated and tailored products that will complement our existing products and services. We also intend to carefully consider potential acquisitions or other strategic investments that fit within our overall strategy. When considering acquisitions, we will focus on opportunities that supplement the range of products and services we offer and strengthen our existing customer base, enable us to maintain our standard for asset quality and profitability and provide us with a reasonable return on our investment.

Increase “fintech” capabilities. We have been enhancing our financial technology, or “fintech,” capabilities in order to expand our non-traditional financial service delivery channels for our customers. We have established a mobile financial service platform through the launch of the first mobile-only banking service in Korea called WiBee Bank in May 2015 and the additions of a mobile messenger application called WiBee Talk and a comprehensive membership point service called WiBee Members in January and July 2016, respectively. In addition, in April 2017, K bank, formed by a consortium with KT Corporation and 20 other companies, in which we own 13.8% of the equity with voting rights, launched its services to become the first Internet-only bank in Korea. K bank also offers its services through convenience stores and phone booths in addition to our ATMs.

We have also strengthened our alliances with information technology companies to provide innovative electronic payment methods, including Woori Samsung Pay with Samsung Electronics, which is a cardless ATM withdrawal system that utilizes smartphones. In August 2016, we commenced iris-scanning authentication at certain of our ATMs, which allows for cardless ATM withdrawals.

Expand presence in the global market. We have continuously expanded our overseas operations since our establishment of the first overseas branch of a Korean commercial bank in Tokyo in 1968. In December 2014, we became the first Korean bank to be involved in a merger with a listed overseas bank when our subsidiary PT. Bank Woori Indonesia merged with and into PT. Bank Himpunan Saudara 1906, which was renamed PT Bank Woori Saudara Indonesia 1906, Tbk. In October 2016, we acquired a 51% equity interest in Wealth Development Bank Corp., a thrift bank in the Philippines, and have partnered with Vicsal Development Corporation, an operator of department stores and supermarkets in the Philippines and another major shareholder of Wealth Development Bank Corp., to actively expand our base of local customers. In addition, in November 2016, we established a local subsidiary in Vietnam, Woori Bank Vietnam, which manages the local operations of our branches in Vietnam. In 2017, we expanded the scope of our operations in Myanmar, Indonesia, Cambodia and the Philippines in order to capitalize on the potential for high growth and profitability in Southeast Asia and established a representative office in Poland as well as branches in India, as a result of which we have a presence in 25 countries with 301 branches and offices outside Korea.

Enhance operational efficiencies and synergies. We have been seeking to improve our operational efficiency and synergies and reduce our expenses by integrating our businesses, unifying our business procedures, eliminating duplication, centralizing processes and procurement, implementing continuous automation and migrating to low cost distribution channels. Among other measures, we have established a centralized information technology center to increase information sharing and synergies among our different business operations.

We believe that the integration of our accounting, information technology and other back-office systems allows us to further eliminate redundant functions and equipment and reduce our long-term expense. We also

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believe that these measures, together with our effort to encourage migration of our mass market customers to low-cost alternative channels, will reduce our costs and enhance our operating efficiencies. We are also continuing our efforts to maximize synergies among our businesses.

Develop and increase productivity of our professional workforce. We aim to retain the most qualified and highly-trained professionals in the market, and we intend to continue to focus on the development and training of our core professionals. In order to boost employee morale and productivity, we aim to create an environment that nurtures development and growth and accordingly have implemented performance-based incentive programs to recognize high performers on both an individual and business group level. In addition, a rigorous ethics management program and related measures have been instituted to reduce operational risk and help ensure compliance with our internal standards and policies.

Corporate Banking

We provide commercial banking services to large corporate customers (including government-owned enterprises) and small- and medium-sized enterprises in Korea. Currently, our corporate banking operations consist mainly of lending to and taking deposits from our corporate customers. We also provide ancillary services on a fee basis, such as inter-account transfers, transfers of funds from branches and agencies of a company to its headquarters and transfers of funds from a company’s customer accounts to the company’s main account.

The following table sets forth the balances and percentages of our total lending and total deposits represented by our large corporate and small- and medium-sized enterprise customer loans and deposits, respectively, and the number of such customers as of the dates indicated:

	As of December 31,
	2015					2016					2017
	Amount		% of Total			Amount		% of Total			Amount		% of Total
	(in billions of Won, except percentages)
Loans(1):
Small- and medium-sized enterprise(2)	￦	67,115		29.5	%	￦	68,434		28.9	%	￦	74,906		29.6	%
Large corporate(3)		40,780		18.0			36,176		15.3			43,372		17.2
Others(4)		19,727		8.7			21,033		8.9			18,398		7.3
Total	￦	127,622		56.2	%	￦	125,643		53.1	%	￦	136,676		54.1	%
Deposits:
Small- and medium-sized enterprise	￦	37,067		17.7	%	￦	39,564		17.9	%	￦	42,693		18.2	%
Large corporate		64,114		30.7			62,899		28.5			68,340		29.1
Total	￦	101,181		48.4	%	￦	102,463		46.4	%	￦	111,033		47.3	%
Number of borrowers:
Small- and medium-sized enterprise		256,592					262,311					280,129
Large corporate		3,297					3,771					4,169

⁽¹⁾  Not including due from banks, other receivables and outstanding credit card balances, and prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs.

⁽²⁾  Loans to “small- and medium-sized enterprises” as defined in the Framework Act on Small and Medium Enterprises of Korea and related regulations (and including project finance loans to such enterprises). See “—Small- and Medium-Sized Enterprise Banking.”

⁽³⁾  Loans to companies that are not “small- and medium-size enterprises” as defined in the Framework Act on Small and Medium Enterprises of Korea and related regulations, and typically including companies that have assets of ￦12 billion or more and are therefore subject to external audit under the Act on External Audits of Stock Companies. See “—Large Corporate Banking.”

⁽⁴⁾  Includes loans to governmental agencies, foreign loans and other corporate loans.

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Corporate loans we provide consist principally of the following:

• working capital loans, which are loans used for general working capital purposes, typically with a maturity of one year or less, including notes discounted and trade finance; and

• facilities loans, which are loans to finance the purchase of materials, equipment and facilities, typically with a maturity of three years or more.

On the deposit-taking side, we currently offer our corporate customers several types of corporate deposit products. These products can be divided into two general categories: demand deposits that have no restrictions on deposits or withdrawals, but which offer a relatively low interest rate; and time deposits from which withdrawals are restricted for a period of time, but offer higher interest rates. We also offer installment deposits, certificates of deposit and repurchase instruments. We offer varying interest rates on our deposit products depending upon the rate of return on our income-earning assets, average funding costs and interest rates offered by other nationwide commercial banks.

Small- and Medium-Sized Enterprise Banking

We use the term “small- and medium-sized enterprises” as defined in the Framework Act on Small and Medium Enterprises of Korea and related regulations. Under the amended Framework Act on Small and Medium Enterprises of Korea, which became effective on April 27, 2016, and related regulations, in order to qualify as a small- and medium-sized enterprise, (i) the enterprise’s total assets at the end of the immediately preceding fiscal year must be less than ￦500 billion, (ii) the enterprise must meet the average or annual sales revenue standards prescribed by the Enforcement Decree of the Framework Act on Small and Medium Enterprises that are applicable to the enterprise’s primary business, and (iii) the enterprise must meet the standards of management independence from ownership as prescribed by the Enforcement Decree of the Framework Act on Small and Medium Enterprises, including non-membership in a conglomerate as defined in the Monopoly Regulations and Fair Trade Act. However, even if an enterprise that qualified as a small- and medium-sized enterprise under the Framework Act on Small and Medium Enterprises prior to the amendments thereof no longer met the definition due to such amendments, such enterprise continued to be deemed a small- and medium-sized enterprise until March 31, 2018. Furthermore, certified social enterprises (as defined in the Social Enterprise Promotion Act of Korea), as well as cooperatives or federations of cooperatives (as defined in the Framework Act on Cooperatives), that satisfy the requirements prescribed by the Framework Act on Small and Medium Enterprises may qualify as small- and medium-sized enterprises. The small- and medium-sized enterprise segment of the corporate banking market has grown significantly in recent years, including as a result of government measures to encourage lending to these enterprises. As of December 31, 2017, 26.0% of our small- and medium-sized enterprise loans were extended to borrowers in the manufacturing industry, 15.8% were extended to borrowers in the retail and wholesale industry, and 7.2% were extended to borrowers in the hotel, leisure and transportation industries.

We service our small- and medium-sized enterprise customers primarily through our network of branches and small- and medium-sized enterprise relationship managers. As of December 31, 2017, we had stationed one or more relationship managers at 726 branches, of which 370 were located in the Seoul metropolitan area. The relationship managers specialize in servicing the banking needs of small- and medium-sized enterprise customers and concentrate their marketing efforts on developing new customers in this segment. As of December 31, 2017, we had a total of 1,009 small- and medium-sized enterprise relationship managers stationed at our branches (as well as 615 non-stationed employees who serve as relationship managers as needed).

In addition to increasing our dedicated staffing and branches, our strategy for this banking segment is to identify promising industry sectors and to develop and market products and services targeted towards customers in these sectors. We have also developed in-house industry specialists who can help us identify leading small- and medium-sized enterprises in, and develop products and marketing strategies for, these targeted industries. In addition, we operate customer loyalty programs for our most profitable small- and medium-sized enterprise customers and provide them with benefits and services such as preferential rates, free seminars and workshops and complementary invitations to cultural events.

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Lending Activities. We provide both working capital loans and facilities loans to our small- and medium-sized enterprise customers. As of December 31, 2017, working capital loans and facilities loans accounted for 47.1% and 49.4%, respectively, of our total small- and medium-sized enterprise loans. As of December 31, 2017, we had approximately 280,129 small- and medium-sized enterprise borrowers.

As of December 31, 2017, secured loans and loans guaranteed by a third party accounted for 68.8% and 6.1%, respectively, of our small- and medium-sized enterprise loans. As of December 31, 2017, approximately 78.5% of the secured loans were secured by real estate and 1.6% were secured by deposits. Working capital loans generally have a maturity of one year, but may be extended on an annual basis for an aggregate term of three to five years if periodic payments are made. Facilities loans have a maximum maturity of 10 years.

When evaluating the extension of working capital loans and facilities loans, we review the creditworthiness and capability to generate cash of the small- and medium-sized enterprise customer. Furthermore, we take corporate guarantees and credit guarantee letters from other financial institutions and use deposits that the borrower has with us or securities pledged to us as collateral.

The value of any collateral is defined using a formula that takes into account the appraised value of the property, any prior liens or other claims against the property and an adjustment factor based on a number of considerations including, with respect to property, the value of any nearby property sold in a court-supervised auction during the previous five years. We generally revalue any collateral on a periodic basis (every year for real estate (with apartments being revalued every month, subject to the availability of certain specified market value information), every year for equipment, every month for deposits and every week for stocks listed on a major Korean stock exchange) or if a trigger event occurs with respect to the loan in question.

Pricing. We establish the pricing for our small- and medium-sized enterprise loan products based principally on transaction risk, our cost of funding and market considerations. Our lending rates are generally determined using our CREPIA system. We use our CREPIA system to manage our lending activities, and input data gathered from loan application forms, credit scores of borrowers and the appraisal value of collateral provided by external valuation experts into the CREPIA system and update such information periodically to reflect changes in such information. See “Item 11. Quantitative and Qualitative Disclosures about Market Risk—Credit Risk Management—Credit Evaluation and Approval.” We measure transaction risk using factors such as the credit rating assigned to a particular borrower and the value and type of collateral. Our system also takes into account cost factors such as the current market interest rate, opportunity cost and cost of capital, as well as a spread calculated to achieve a target rate of return. Depending on the price and other terms set by competing banks for similar borrowers, we may reduce the interest rate we charge to compete more effectively with other banks. Loan officers have limited discretion in deciding what interest rates to offer, and significant variations require review at higher levels. As of December 31, 2017, approximately 81.3% of our small- and medium-sized enterprise loans had interest rates that varied with reference to current market interest rates.

Large Corporate Banking

Our large corporate customers consist of companies that are not “small- and medium-size enterprises” as defined in the Framework Act on Small and Medium Enterprises of Korea and related regulations, and typically include companies that have assets of ￦12 billion or more and are therefore subject to external audit under the Act on External Audits of Stock Companies. As a result of our history and development, we remain the main creditor bank to many of Korea’s largest corporate borrowers.

In terms of our outstanding loan balance, as of December 31, 2017, 40.9% of our large corporate loans were extended to borrowers in the finance and insurance industry, 33.0% were extended to borrowers in the manufacturing industry, and 6.9% were extended to borrowers in the retail and wholesale industry.

We service our large corporate customers primarily through our network of dedicated corporate banking centers and general managers. We operate 10 dedicated corporate banking centers, all of which are located in the Seoul metropolitan area. Each center is staffed with one or more general managers, and certain centers are headed by a senior general manager. Depending on the center, each such manager is responsible for large

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corporate customers that either are affiliates of a particular chaebol or operate in a particular industry or region. As of December 31, 2017, we had a total of 84 general managers who focus on marketing to and managing the accounts of large corporate customers.

Our strategy for the large corporate banking segment is to develop new products and cross-sell our existing products and services to our core base of large corporate customers. In particular, we continue to focus on marketing fee-based products and services such as foreign exchange and trade finance services, derivatives and other risk hedging products, investment banking services and advisory services. We have also been reviewing the credit and risk profiles of our existing customers as well as those of our competitors, with a view to identifying a target group of high-quality customers on whom we can concentrate our marketing efforts. In addition, we are seeking to continue to increase the chaebol-, region- and industry-based specialization of the managers at our dedicated corporate banking centers, including through the operation of a knowledge management database that allows greater sharing of marketing techniques and skills.

Lending Activities.  We provide both working capital loans and facilities loans to our large corporate customers. As of December 31, 2017, working capital loans (including domestic usuance, bills bought and securities sold under repurchase agreements) and facilities loans accounted for 78.7% and 12.9%, respectively, of our total large corporate loans.

Loans to large corporate customers may be secured by real estate or deposits or be unsecured. As of December 31, 2017, secured loans and loans guaranteed by a third party accounted for 13.0% and 4.1%, respectively, of our large corporate loans. Since a relatively low percentage of our large corporate loan portfolio is secured by collateral, we may be required to establish larger allowances for credit losses with respect to any such loans that become non-performing or impaired. See “—Assets and Liabilities—Asset Quality of Loans—Loan Loss Provisioning Policy.” As of December 31, 2017, approximately 65.0% of the secured loans were secured by real estate and approximately 4.9% were secured by deposits. Working capital loans generally have a maturity of one year but may be extended on an annual basis for an aggregate term of three to five years. Facilities loans have a maximum maturity of 10 years.

We evaluate creditworthiness and collateral for our loans to large corporate customers in essentially the same way as we do for loans to small- and medium-sized enterprise customers. See “—Corporate Banking—Small- and Medium-Sized Enterprise Banking—Lending Activities.”

Pricing.  We determine the pricing of our loans to large corporate customers in the same way that we determine the pricing of our loans to small- and medium-sized enterprise customers. See “—Corporate Banking—Small- and Medium-Sized Enterprise Banking—Pricing.” As of December 31, 2017, approximately 93.3% of these loans had interest rates that varied with reference to current market interest rates.

Consumer Banking

We provide retail banking services to consumers in Korea. Our consumer banking operations consist mainly of lending to and taking deposits from our retail customers. We also provide ancillary services on a fee basis, such as wire transfers. While we have historically attracted and held large amounts of consumer deposits through our extensive branch network, our substantial consumer lending growth occurred principally in recent years, in line with the increase in the overall level of consumer debt in Korea. See “—Branch Network and Other Distribution Channels.”

We classify our consumer banking customers based on their individual net worth and contribution to our consumer banking operations into four groups: high net worth; mass affluent; middle class; and mass market. We differentiate our products, services and service delivery channels with respect to these segments and target our marketing and cross-selling efforts based on this segmentation. With respect to the high net worth and mass affluent segments, we have established private banking operations to better service customers in these segments. See “—Private Banking Operations.” With respect to the middle class segment, we seek to use our branch-level sales staff to maximize the overall volume of products and services we provide. With respect to the mass market segment, we have focused on increasing our operating efficiency by encouraging customers to migrate to low-cost alternative service delivery channels, such as the Internet, call centers, mobile banking and ATMs.

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Lending Activities

We offer a variety of consumer loan products to households and individuals. We differentiate our product offerings based on a number of factors, including the customer’s age group, the purpose for which the loan is used, collateral requirements and maturity. The following table sets forth the balances and percentage of our total lending represented by our consumer loans as of the dates indicated:

	As of December 31,
	2015					2016					2017
	Amount(1)		% of Total Loans(2)			Amount(1)		% of Total Loans(2)			Amount(1)		% of Total Loans(2)
	(in billions of Won, except percentage)
General purpose household loans	￦	28,193		12.4	%	￦	32,368		13.7	%	￦	36,301		14.4	%
Mortgage loans		40,598		17.9			47,630		20.1			47,476		18.8
Home equity loans		24,657		10.9			24,486		10.3			25,513		10.1
Total	￦	93,448		41.2	%	￦	104,484		44.1	%	￦	109,290		43.2	%

⁽¹⁾  Not including outstanding credit card balances, and prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs.

⁽²⁾  Total loans do not include other receivables and are before the deduction of allowance for credit losses and present value discount and the reflection of deferred origination costs.

Our consumer loans consist of:

• general purpose household loans, which are loans made to customers for any purpose (other than mortgage and home equity loans), and include overdraft loans, which are loans extended to customers to cover insufficient funds when they withdraw funds from their demand deposit accounts with us in excess of the amount in such accounts up to a limit established by us; and

• mortgage loans, which are loans made to customers to finance home purchases, construction, improvements or rentals, and home equity loans, which are loans made to customers secured by their homes to ensure loan repayment.

For secured loans, including mortgage and home equity loans, we generally lend up to 70% of the collateral value (except in areas of high speculation designated by the government where we generally limit our lending to 40% of the appraised value of collateral) minus the value of any lien or other security interest that is prior to our security interest. In calculating the collateral value for real estate for such secured consumer loans (which principally consists of residential properties), we generally use the fair value of the collateral as appraised by Korea Investors Service which is collated in our CREPIA system. We generally revalue collateral on a periodic basis. As of December 31, 2017, the revaluation frequency was every year for real estate (with apartments being revalued every month, subject to the availability of certain specified market value information), every year for equipment, every month for deposits and every week for stocks listed on a major Korean stock exchange.

A borrower’s eligibility for general purpose household loans is primarily determined by such borrower’s creditworthiness. In reviewing a potential borrower’s loan application, we also consider the suitability of the borrower’s proposed use of funds, as well as the borrower’s ability to provide a first-priority mortgage. A borrower’s eligibility for a home equity loan is primarily determined by such borrower’s creditworthiness (including as determined by our internal credit scoring protocols) and the value of the collateral property, as well as any third party guarantees of the borrowed amounts.

We also offer a variety of collective housing loans, including loans to purchase property or finance the construction of housing units, loans to contractors to be used for working capital purposes, and loans to educational institutions and non-profit entities to finance the construction of dormitories. Collective housing loans subject us to the risk that the housing units will not be sold. As a result, we review the probability of the sale of the housing unit when evaluating the extension of a loan. We also review the borrower’s creditworthiness and the suitability of the borrower’s proposed use of funds. Furthermore, we take a lien on the land on which the

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housing unit is to be constructed as collateral. If the collateral is not sufficient to cover the loan, we also take a guarantee from the Housing Finance Credit Guarantee Fund as security.

General Purpose Household Loans

Our general purpose household loans may be secured by real estate (other than homes), deposits or securities. As of December 31, 2017, approximately ￦26,978 billion, or 74.3%, of our general purpose household loans were unsecured, although some of these loans were guaranteed by a third party. Overdraft loans are primarily unsecured and typically have a maturity between one and three years, and the amount of such loans has been steadily declining. As of December 31, 2017, this amount was approximately ￦44 million.

Pricing.  The interest rates on our general purpose household loans are either a periodic floating rate (which is based on a base rate determined for three-month, six-month or twelve-month periods, further adjusted to account for the borrower’s credit score and our opportunity cost) or a fixed rate that reflects our internal cost of funding and similar adjustments, but taking into account interest rate risks. In 2010, we began using the “Cost of Fund Index” (or COFIX) benchmark rate, as announced by the Korea Federation of Banks, as the base rate for our general purpose household loans with periodic floating rates in place of the benchmark certificate of deposit rate that we had traditionally used for such purpose.

Our interest rates also incorporate a margin based on, among other things, the type of collateral (if any), priority with respect to any security, our target loan-to-value ratio and loan duration. We also can adjust the applicable rate based on current or expected profit contribution of the customer. Our lending rates are generally determined by our CREPIA system. The applicable interest rate is determined at the time of the drawdown of the loan. We also charge a termination fee in the event a borrower repays the loan prior to maturity. As of December 31, 2017, approximately 66.9% of our general purpose household loans had floating interest rates.

Mortgage and Home Equity Lending

We provide customers with a number of mortgage and home equity loan products that have flexible features, including terms, repayment schedules, amounts and eligibility for loans. The maximum term of our mortgage and home equity loans is typically 35 years. Most of our mortgage and home equity loans provided prior to January 2016 have an interest-only payment period of 10 years or less. However, the Korea Federation of Banks’ implementation of its Guidelines on Banks’ Mortgage Loan Screening changed the default interest-only payment period to one year or less, which applies to loans that were originated subsequent to the effective date of the Guidelines in January 2016. With respect to mortgage and home equity loans, we determine the eligibility of borrowers based on the borrower’s personal information, transaction history and credit history using our CREPIA system. See “Item 11. Quantitative and Qualitative Disclosures about Market Risk—Credit Risk Management—Credit Evaluation and Approval.” The eligibility of a borrower that is participating in a housing lottery will depend on proof that it has paid a deposit or can obtain a guarantee from a Korean government-related housing fund.

As of December 31, 2017, approximately 64.9% of our mortgage and home equity loans were secured by residential or other property, 25.9% of our mortgage and home equity loans were guaranteed by Korean government-related housing funds and 5.7% of our mortgage and home equity loans, contrary to general practices in the United States, were unsecured (although the use of proceeds from mortgage and home equity loans is restricted for the purpose of financing home purchases and some of these loans were guaranteed by a third party). One reason that a portion of our mortgage and home equity loans are unsecured is that we, along with other Korean banks, provide advance loans to borrowers for the down payment of new housing (particularly apartments) that is in the process of being built. Once construction is completed, which may take several years, these mortgage and home equity loans become secured by the new housing purchased by these borrowers. As of December 31, 2017, we had issued unsecured construction loans relating to housing where construction was not completed in the amount of ￦4,130 billion. For the year ended December 31, 2017, the average initial loan-to-value ratio of our mortgage loans and home equity loans was approximately 59.1% and 55.6%, respectively, compared to 60.3% and 54.8% for the year ended December 31, 2016. The average loan-to-value ratio of our

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mortgage loans and home equity loans as of December 31, 2017 was approximately 51.5% and 50.4%, respectively, compared to 56.8% and 52.2% as of December 31, 2016.

Pricing.  The interest rates for our mortgage and home equity loans are determined on essentially the same basis as our general purpose household loans, except that for mortgage and home equity loans we place significantly greater weight on the value of any collateral that is being provided to secure the loan. The base rate we use in determining the interest rate for our mortgage and home equity loans is identical to the base rate we use to determine pricing for our general purpose household loans. As of December 31, 2017, approximately 66.1% of our outstanding mortgage and home equity loans had floating interest rates.

Private Banking Operations

Our private banking operations aim to service our high net worth and mass affluent retail customers. As of December 31, 2017, we had over 179,200 customers who qualified for private banking services, representing 0.8% of our total retail customer base. Of our total retail customer deposits of ￦97 trillion as of December 31, 2017, high net worth and mass affluent customers accounted for 55.1%.

Through our private bankers, we provide financial and real estate advisory services to our high net worth and mass affluent customers. We also market differentiated investment and banking products and services to these segments, including beneficiary certificates, overseas mutual fund products, specialized bank accounts and credit cards. In addition, we have developed a customer loyalty program for our private banking customers that provides preferential rate and fee benefits and awards. We have also segmented our private banking operations by introducing exclusive private client services for high net worth customers who individually maintain a deposit balance of at least ￦100 million. We believe that our private banking operations will allow us to increase our revenues from our existing high net worth and mass affluent customers, as well as attract new customers in these segments.

We have 668 branches that offer private banking services. These branches are staffed by 686 private bankers, and almost all of the branches are located in metropolitan areas, including Seoul.

We also operate an advisory center in Seoul for our private banking clients, which employs 20 specialists advising on matters of law, tax, real estate, risk assessment and investments.

Deposit-Taking Activities

As of December 31, 2017, we were the third-largest deposit holder among Korean banks, in large part due to our nation-wide branch network. The balance of our deposits from retail customers was ￦73,364 billion as of December 31, 2015, ￦80,655 billion as of December 31, 2016 and ￦95,757 billion as of December 31, 2017 which constituted 35.1%, 36.5% and 40.8%, respectively, of the balance of our total deposits.

We offer diversified deposit products that target different customers with different needs and characteristics. These deposit products fall into five general categories:

• demand deposits, which either do not accrue interest or accrue interest at a lower rate than time, installment or savings deposits. The customer may deposit and withdraw funds at any time and, if the deposits are interest-bearing, they accrue interest at a fixed or variable rate depending on the period and/or amount of deposit;

• time deposits, which generally require a customer to maintain a deposit for a fixed term during which interest accrues at a fixed or floating rate. Early withdrawals require penalty payments. The term for time deposits typically ranges from one month to five years;

• savings deposits, which allow the customer to deposit and withdraw funds at any time and accrue interest at a fixed rate set by us depending upon the period and amount of deposit;

• installment deposits, which generally require the customer to make periodic deposits of a fixed amount over a fixed term during which interest accrues at a fixed rate. Early withdrawals require penalty payment. The term for installment deposits range from six months to five years; and

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• certificates of deposit, the maturities of which range from 30 days to five years, with a required minimum deposit of ￦10 million. Interest rates on certificates of deposit vary with the length of deposit and prevailing market rates. Certificates of deposit may be sold at face value or at a discount with the face amount payable at maturity.

The following table sets forth the percentage of our total retail and corporate deposits represented by each deposit product category as of December 31, 2017:

Demand Deposits	Time Deposits	Savings Deposits	Installment Deposits	Certificates of Deposit
10.08%	52.34%	35.68%	0.01%	1.89%

We offer varying interest rates on our deposit products depending on market interest rates as reflected in average funding costs, the rate of return on our interest-earning assets and the interest rates offered by other commercial banks. Generally, the interest payable is the highest on installment deposits and decreases with certificate of deposit accounts and time deposits and savings deposit accounts receiving relatively less interest, and demand deposits accruing little or no interest.

We also offer deposits in foreign currencies and a specialized deposit product, the apartment application comprehensive deposit, which is a monthly installment comprehensive savings program providing the holder with a preferential right to subscribe for new national housing units constructed under the Housing Act or new privately constructed housing units. This deposit product requires monthly installments of ￦20,000 to ￦500,000, terminates when the holder is selected as a subscriber for a housing unit and accrues interest at variable rates depending on the term.

The Monetary Policy Committee of the Bank of Korea imposes a reserve requirement on Won currency deposits of commercial banks based generally on the type of deposit instrument. The minimum reserve requirement ratio is 7%. See “—Supervision and Regulation—Principal Regulations Applicable to Banks—Liquidity.” Ongoing regulatory reforms have removed all controls on lending rates and deposit rates (except for the prohibition on interest payments on current account deposits).

The Depositor Protection Act provides for a deposit insurance system where the KDIC guarantees to depositors the repayment of their eligible bank deposits. The deposit insurance system insures up to a total of ￦50 million per depositor per bank. See “—Supervision and Regulation—Principal Regulations Applicable to Banks—Deposit Insurance System.” We pay a quarterly premium of 0.02% of our average deposits and a quarterly special contribution of 0.025% of our average deposits, in each case for the relevant quarter. For the year ended December 31, 2017, we paid an aggregate of ￦305 billion of such premiums and contributions.

Branch Network and Other Distribution Channels

We had a total of 876 banking branches in Korea as of December 31, 2017, which was one of the most extensive networks of branches among Korean commercial banks. In recent years, demand in Korea for mutual funds and other asset management products as well as bancassurance products has been rising. These products require an extensive sales force and customer interaction to sell, further emphasizing the need for a large branch network. As a result, an extensive branch network is important to attracting and maintaining retail customers, as they generally conduct a significant portion of their financial transactions through bank branches. We believe that our extensive branch network in Korea helps us to maintain our retail customer base, which in turn provides us with a stable and relatively low cost funding source.

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The following table presents the geographical distribution of our banking branch network in Korea as of December 31, 2017:

	Total
	Number		% of Total
Area
Seoul		402		46	%
Six largest cities (other than Seoul)		150		17
Other		324		37
Total		876		100	%

In order to maximize access to our products and services, we have established an extensive network of ATMs and cash dispensers, which are located in branches as well as unmanned outlets. We had 5,952 ATMs and cash dispensers as of December 31, 2017.

We actively promote the use of alternative service delivery channels in order to provide convenient service to customers. We also benefit from customers’ increasing use of these channels, as they allow us to maximize the marketing and sales functions at the branch level, reduce employee costs and improve profitability. The following tables set forth information, for the periods indicated, relating to the number of transactions and the fee revenue of our alternative service delivery channels.

	For the year ended December 31,
	2015		2016		2017
ATMs(1):
Number of transactions (millions)		378		346		316
Fee income (billions of Won)	￦	44	￦	40	￦	40
Telephone banking:
Number of users		6,058,318		6,419,017		6,384,164
Number of transactions (millions)		106		105		104
Fee income (billions of Won)	￦	3	￦	3	￦	3
Internet banking:
Number of users		14,775,540		15,631,766		16,554,353
Number of transactions (millions)		6,567		6,994		7,566
Fee income (billions of Won)	￦	141	￦	150	￦	160

⁽¹⁾  Includes cash dispensers.

Most of our electronic banking transactions do not generate fee income as many of those transactions are free of charge, such as balance inquiries, consultations with customer representatives or transfers of money. This is particularly true for telephone banking services, where a majority of the transactions are balance inquiries or consultations with customer representatives, although other services such as money transfers are also available.

Our automated telephone banking system offers a variety of services, including inter-account fund transfers, balance and transaction inquiries and customer service inquiries. We also operate a call center that handles calls from customers, engages in telemarketing and assists in our collection efforts.

Our Internet banking services include balance and transaction inquiries, money transfers, loan applications, bill payment and foreign exchange transactions. We seek to maintain and increase our Internet banking customer base by focusing largely on our younger customers and those that are able to access the Internet easily (such as office workers) as well as by developing additional Internet-based financial services and products. We also develop new products to target different types of customers with respect to our Internet banking services, and have developed a service that enables private banking customers to access their accounts on a website that provides specialized investment advice. We also offer online escrow services.

In addition, we provide mobile banking services to our customers, which is available to all our Internet-registered users. These services allow our customers to complete selected banking transactions through major

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Korean telecommunications networks using their smart phones or other mobile devices. In May 2015, we launched the first mobile-only banking service in Korea, called WiBee Bank, and we are expanding its services to Southeast Asia.

We also offer our “Win-CMS” service to our corporate customers, which provides an integrated electronic cash management system and in-house banking platform for such customers.

Credit Cards

We offer credit card products and services mainly to consumers and corporate customers in Korea. In April 2013, as a part of our strategy to enhance our credit card operations and increase its synergies with our other businesses, we effected a horizontal spin-off of our credit card business. As a result, our former credit card business is operated by a wholly-owned subsidiary, Woori Card. As of December 31, 2017, Woori Card’s market share based on transaction volume was approximately 8.7%, which ranked Woori Card as the sixth largest credit card issuer in Korea, according to BC Research, which is a quarterly report issued by BC Card.

Our credit card operations benefit from Woori Card’s ownership of a 7.65% equity stake in BC Card. BC Card is co-owned by KT Corporation, which is one of Korea’s largest telecommunications companies, and other Korean financial institutions, and operates the largest merchant payment network in Korea as measured by transaction volume. This ownership stake allows us to outsource production and delivery of new credit cards, the preparation of monthly statements, management of merchants and other ancillary services to BC Card for our credit card operations.

Products and Services

We currently have the following principal brands of credit cards outstanding:

• a “Woori” brand;

• a “BC Card” brand; and

• a “Visa” brand.

We issue “Visa” brand cards under a non-exclusive license agreement with Visa International Service Association and also issue “MasterCard,” “JCB” and “Union Pay” brand cards under a non-exclusive, co-branding agreement with BC Card.

We offer a number of different services to holders of our credit cards. Generally, these services include:

• credit purchase services, which allow cardholders to purchase merchandise or services on credit and repay such credit on a lump-sum or installment basis;

• cash advance services from ATMs and bank branches; and

• credit card loans, which are loans that cardholders can obtain based on streamlined application procedures.

Unlike in the United States and many other countries, where most credit cards are revolving cards that allow outstanding balances to be rolled over from month to month so long as a required minimum percentage is repaid, cardholders in Korea are generally required to pay for their non-installment purchases as well as cash advances within approximately 15 to 60 days of purchase or advance, depending on their payment cycle.

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The following tables set forth certain data relating to the credit card operations of Woori Card (including BC Cards and Visa Cards issued through the BC Card consortium) as of the dates or for the period indicated:

	As of or for the year ended December 31,
	2015			2016			2017
	(in billions of Won, unless indicated otherwise)
Number of credit card holders (at year end) (thousands of holders)
General accounts		11,789			12,125			12,509
Corporate accounts		642			481			550
Total		12,431			12,606			13,059
Active ratio(1)		47.20	%		49.00	%		50.70	%
Credit card interest and fees
Installment and cash advance interest	￦	223		￦	236		￦	225
Annual membership fees		43			56			72
Merchant fees		763			831			896
Other fees		343			421			570
Total	￦	1,372		￦	1,544		￦	1,763
Charge volumes
General purchase	￦	50,761		￦	59,678		￦	58,454
Installment purchase		5,454			6,231			6,796
Cash advance		4,404			4,620			4,700
Card loan		2,984			2,991			2,944
Total	￦	63,603		￦	73,520		￦	72,894
Outstanding balances (at year end)
General purchase	￦	2,275		￦	2,580		￦	2,595
Installment purchase		1,315			1,383			1,559
Cash advance		565			573			574
Card loan		1,951			2,146			2,107
Total	￦	6,106		￦	6,682		￦	6,835
Average outstanding balances
General purchase	￦	2,299		￦	2,591		￦	2,822
Installment purchase		1,208			1,375			1,520
Cash advance		558			576			581
Card loan		1,748			2,047			2,174
Total	￦	5,813		￦	6,589		￦	7,097
Delinquency ratios(2)
Less than 1 month		1.68			1.37			1.78
From 1 month to 3 months		0.83			0.76			0.72
From 3 months to 6 months		0.76			0.44			0.57
Over 6 months		0.00			0.00			0.00
Total		3.27	%		2.57	%		3.07	%
Non-performing loan ratio(3)		1.12	%		0.76	%		0.83	%
Gross charge-offs	￦	198		￦	242		￦	228
Recoveries		34			44			51
Net charge-offs	￦	164		￦	198		￦	177
Gross charge-off ratio(4)		3.41	%		3.66	%		3.22	%
Net charge-off ratio(5)		2.82	%		3.00	%		2.49	%

⁽¹⁾  Represents the ratio of accounts used at least once within the past month to total accounts as of the end of the relevant year.

⁽²⁾  Our delinquency ratios may not fully reflect all delinquent amounts relating to our outstanding balances since a certain portion of delinquent credit card balances (defined as balances one day or more past due) were restructured into loans and were not treated as being delinquent at the time of conversion or for a period of time thereafter. Including all restructured loans, outstanding balances overdue by more than one month accounted for 3.1% of our credit card balances as of December 31, 2017.

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⁽³⁾  Represents the ratio of balances that are more than three months overdue to total outstanding balances as of the end of the relevant year. These ratios do not include the following amounts of previously delinquent credit card balances restructured into loans that were classified as normal or precautionary as of December 31, 2015, 2016 and 2017:

	As of December 31,
	2015		2016		2017
	(in billions of Won)
Restructured loans	￦	73	￦	102	￦	122

⁽⁴⁾  Represents the ratio of gross charge-offs for the year to average outstanding balances for the year. Our charge-off policy is to charge off balances which are more than six months past due (including previously delinquent credit card balances restructured into loans that are more than six months overdue from the point at which the relevant balances were so restructured), except for those balances with a reasonable probability of recovery.

⁽⁵⁾  Represents the ratio of net charge-offs for the year to average outstanding balances for the year.

We offer a diverse range of credit card products within our various brands. Factors that determine which type of card a particular cardholder may receive include net worth, age, location, income level and the particular programs or services that may be associated with a particular card. Targeted products that we offer include:

• cards that offer additional benefits, such as frequent flyer miles and award program points that can be redeemed for services, products or cash;

• gold cards, platinum cards and other preferential members’ cards that have higher credit limits and provide additional services;

• corporate and affinity cards that are issued to employees or members of particular companies or organizations; and

• revolving credit cards and cards that offer travel services and insurance.

In recent years, credit card issuers in Korea have agreed with selected cardholders to restructure their delinquent credit card account balances as loans that have more gradual repayment terms, in order to retain fundamentally sound customers who are experiencing temporary financial difficulties and to increase the likelihood of eventual recovery on those balances. In line with industry practice, we have restructured a portion of our delinquent credit card account balances as loans. The general qualifications to restructure delinquent credit card balances as loans are that the delinquent amount be more than one month overdue and in excess of ￦1 million. The terms of the restructured loans usually require the payment of approximately 10% to 20% of the outstanding balance as a down payment and that they be guaranteed by a third party and carry higher interest rates than prevailing market rates. These loans are usually required to be repaid by the borrower in installments over terms ranging from three months to 60 months. As of December 31, 2017, the total amount of our restructured loans was ￦131 billion. Because restructured loans are not initially recorded as being delinquent, our delinquency ratios do not fully reflect all delinquent amounts relating to our outstanding credit card balances.

Payments and Charges

Revenues from our credit card operations consist principally of cash advance charges, merchant fees, interest income from credit card loans, interest on late and deferred payments, and annual membership fees paid by cardholders.

Each cardholder is allocated an aggregate credit limit in respect of all cards issued under his or her account and each month. We advise each cardholder of the credit limit relating to the cards in his or her monthly billing statement. Credit limits in respect of card loans are established separately. We conduct ongoing monitoring of all cardholders and accounts, and may reduce the credit limit or cancel an existing cardholder’s card based on current economic conditions, receipt of new negative credit data from third party sources or the cardholder’s score under the credit risk management systems we use to monitor their behavior, even if the cardholder continues to make timely payments in respect of his or her cards. We consider an account delinquent if the payment due is not received on the first monthly payment date on which such payment was due, and late fees are immediately applied. Late fee charges and computation of the delinquency period are based on each outstanding unpaid transaction or installment, as applicable. See “Item 11. Quantitative and Qualitative Disclosures about Market Risk—Credit Risk Management—Credit Review and Monitoring.”

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Payments on amounts outstanding on our credit cards must be made (at the cardholder’s election at the time of purchase) either in full on each monthly payment date, in the case of lump-sum purchases, or in equal monthly installments over a fixed term from two months to 36 months, in the case of installment purchases. Cardholders may prepay installment purchases at any time without penalty. Payment for cash advances must be made on a lump sum basis. Payments for card loans must be made on an equal principal installment basis over a fixed term from three months up to a maximum of 36 months, up to a maximum loan amount of ￦30 million.

No interest is charged on lump-sum purchases that are paid in full by the monthly payment date. For installment purchases, we charge a fixed rate of interest on the outstanding balance of the transaction amount, based on the installment period selected at the time of purchase. For a new cardholder, we currently apply an interest rate between approximately 9.5% and 19.5% per annum as determined by the cardholder’s application system score. See “Item 11. Quantitative and Qualitative Disclosures about Market Risk—Credit Risk Management—Credit Evaluation and Approval—Credit Card Approval Process” and “—Credit Review and Monitoring—Credit Card Review and Monitoring.”

For cash advances, finance charges start accruing immediately following the cash withdrawal. We currently charge a periodic finance charge on the outstanding balance of cash advance of approximately 6.4% to 26.4% per annum. The periodic finance charge assessed on such balances is calculated by multiplying the daily installment balances for each day during the billing cycle by the applicable periodic finance charge rate, and aggregating the results for each day in the billing period. In addition to finance charges, cardholders using cash advance networks operated by companies that are not financial institutions (such as Hannet and NICE) are charged a minimum commission of ￦800 and a maximum of ￦1,300 per withdrawal.

We also generally charge a basic annual membership fee of ￦2,000 to ￦25,000 for regular and gold cards and ￦30,000 to ￦1,000,000 for platinum cards. The determination of the annual fee is based on various factors including the type of card, and whether affiliation options are selected by the cardholder. For certain cards, such as the Woori V Card, we will waive membership fees if customers charge above a certain amount.

We outsource the management of merchants to BC Card. We charge merchant fees to merchants for processing transactions. Merchant fees vary depending on the type of merchant and the total transaction amounts generated by the merchant. As of December 31, 2017, we charged merchants an average of 1.37% of their respective total transaction amounts. In addition to merchant fees, we receive nominal interchange fees for international card transactions.

Capital Markets Activities

We engage in capital markets activities for our own account and for our customers. Our capital markets activities include securities investment and trading, derivatives trading, asset securitization services and investment banking.

Securities Investment and Trading

We invest in and trade securities for our own account, in order to maintain adequate sources of liquidity and to generate interest and dividend income and capital gains. As of December 31, 2017, our investment portfolio, which consists of held-to-maturity financial assets and available-for-sale financial assets, and our trading portfolio, which consists of financial assets held for trading and financial assets designated at fair value through profit or loss (excluding deposits and derivative assets), had a combined total book value of ￦34,804 billion and represented 11.0% of our total assets.

Our trading and investment portfolios consist primarily of Korean treasury securities and debt securities issued by Korean government agencies, including the KDIC, local governments or government-invested enterprises, and debt securities issued by financial institutions. As of December 31, 2017, we held debt securities with a total book value of ￦32,462 billion, of which:

• held-to-maturity debt securities accounted for ￦16,749 billion, or 51.6%;

• available-for-sale debt securities accounted for ￦13,059 billion, or 40.2%;

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• debt securities held for trading accounted for ￦2,644 billion, or 8.2%; and

• debt securities designated at fair value through profit or loss accounted for ￦10 billion, or less than 0.1%.

Of these amounts, as of December 31, 2017, debt securities issued by the Korean government amounted to ￦3,995 billion, or 23.9% of our held-to-maturity debt securities, ￦2,331 billion, or 17.8% of our available-for-sale debt securities, and ￦540 billion, or 20.4% of our trading debt securities.

From time to time, we also purchase and sell equity securities for our securities portfolios. Our equity securities consist primarily of equities listed on the KRX KOSPI Market or the KRX KOSDAQ Market. As of December 31, 2017:

• equity securities in our available-for-sale portfolio had a book value of ￦1,411 billion, or 9.2% of our available-for-sale securities portfolio;

• equity securities held for trading accounted for ￦22 billion, or 0.8% of our held-for-trading securities portfolio; and

• equity securities designated at fair value through profit or loss accounted for ￦13 billion, or 56.5% of our financial assets designated at fair value through profit or loss portfolio.

Funds that are not used for lending activities are used for investment and liquidity management purposes, including investment and trading in securities. See “—Assets and Liabilities—Securities Investment Portfolio.”

The following tables show, as of the dates indicated, the gross unrealized gains and losses within our investment portfolio and the amortized cost and fair value of the portfolio by type of investment financial asset:

	As of December 31, 2015
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
	(in billions of Won)
Available-for-sale financial assets:
Debt securities
Korean treasury and government agencies	￦	3,530	￦	29	￦	—		￦	3,559
Financial institutions		5,599		27		—			5,626
Corporate		3,809		79		—			3,888
Asset-backed securities		260		—		(2	)		258
Foreign currency bonds		650		1		(13	)		638
Others		12		8		—			20
Subtotal		13,860		144		(15	)		13,989
Equity securities		968		376		(6	)		1,338
Beneficiary certificates(1)		1,119		24		(25	)		1,118
Others		723		3		—			726
Total available-for-sale financial assets	￦	16,670	￦	547	￦	(46	)	￦	17,171
Held-to-maturity financial assets:
Debt securities
Korean treasury and government agencies	￦	3,367	￦	64	￦	—		￦	3,431
Financial institutions		4,138		26		—			4,164
Corporate		6,021		107		(5	)		6,123
Foreign currency bonds		96		—		—			96
Total held-to-maturity financial assets	￦	13,622	￦	197	￦	(5	)	￦	13,814

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	As of December 31, 2016
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
	(in billions of Won)
Available-for-sale financial assets:
Debt securities
Korean treasury and government agencies	￦	3,779	￦	14	￦	(4	)	￦	3,789
Financial institutions		6,311		7		(4	)		6,314
Corporate		4,336		94		(21	)		4,409
Asset-backed securities		250		—		(1	)		249
Foreign currency bonds		1,227		1		(16	)		1,212
Others		73		2		—			75
Subtotal		15,976		118		(46	)		16,048
Equity securities		1,034		420		—			1,454
Beneficiary certificates(1)		2,803		40		(21	)		2,822
Others		494		3		(3	)		494
Total available-for-sale financial assets	￦	20,307	￦	581	￦	(70	)	￦	20,818
Held-to-maturity financial assets:
Debt securities
Korean treasury and government agencies	￦	3,754	￦	27	￦	(7	)	￦	3,774
Financial institutions		5,169		9		(5	)		5,173
Corporate		4,823		58		(7	)		4,874
Foreign currency bonds		164		—		—			164
Total held-to-maturity financial assets	￦	13,910	￦	94	￦	(19	)	￦	13,985

	As of December 31, 2017
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
	(in billions of Won)
Available-for-sale financial assets:
Debt securities
Korean treasury and government agencies	￦	2,339	￦	1	￦	(9	)	￦	2,331
Financial institutions		5,225		2		(10	)		5,217
Corporate		2,727		4		(6	)		2,725
Asset-backed securities		310		—		(2	)		308
Foreign currency bonds		2,450		3		(10	)		2,443
Others		35		—		—			35
Subtotal		13,086		10		(37	)		13,059
Equity securities		982		431		(2	)		1,411
Beneficiary certificates(1)		698		19		(4	)		713
Others		169		1		—			170
Total available-for-sale financial assets	￦	14,935	￦	461	￦	(43	)	￦	15,353
Held-to-maturity financial assets:
Debt securities
Korean treasury and government agencies	￦	3,995	￦	7	￦	(15	)	￦	3,987
Financial institutions		7,245		3		(15	)		7,233
Corporate		5,312		12		(25	)		5,299
Foreign currency bonds		197		1		(1	)		197
Total held-to-maturity financial assets	￦	16,749	￦	23	￦	(56	)	￦	16,716

⁽¹⁾  Beneficiary certificates are instruments that are issued by and represent an ownership interest in an investment trust. Investment trusts, which operate like mutual funds in the United States, are managed by investment trust management companies and invest in portfolios of securities and/or other financial instruments, such as certificates of deposit. Beneficiary certificates give the holder beneficial rights to both the relevant investment trust and the trust property in which the investment trust has invested.

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For a discussion of our risk management policies with respect to our securities trading activities, see “Item 11. Quantitative and Qualitative Disclosures about Market Risk—Market Risk Management—Market Risk Management for Trading Activities.”

Derivatives Trading

We offer derivatives products and engage in derivatives trading, mostly for our corporate customers. Our trading volume was ￦203,956 billion in 2015, ￦233,871 billion in 2016 and ￦268,734 billion in 2017. Our aggregate net trading revenue (loss) from derivatives for the years ended December 31, 2015, 2016 and 2017 was ￦174 billion, ￦176 billion and ￦(53) billion, respectively.

We provide and trade a number of derivatives products principally through sales or brokerage accounts for our customers, including:

• interest rate swaps, options and futures, relating principally to Won interest rate risks;

• index futures and options, relating to stock market fluctuations;

• cross currency swaps, relating to foreign exchange risks, largely for Won against U.S. dollars;

• foreign exchange forwards, swaps, options and futures, relating to foreign exchange risks;

• commodity derivatives, which we provide to customers that wish to hedge their commodities exposure; and

• credit derivatives, which we provide to financial institutions that wish to hedge existing credit exposures or take on credit exposure to generate revenue.

Our derivatives operations focus on addressing the needs of our corporate clients to hedge their risk exposure and on hedging our risk exposure resulting from such client contracts. We also engage in derivatives trading activities to hedge the interest rate and foreign currency risk exposure that arises from our own assets and liability positions. In addition, we engage in proprietary trading of derivatives, such as index options and futures within our regulated open position limits, for the purpose of generating capital gains.

The following shows the estimated fair value of derivatives we held or had issued for trading purposes as of the dates indicated:

	As of December 31,
	2015				2016				2017
	Estimated Fair Value of Assets		Estimated Fair Value of Liabilities		Estimated Fair Value of Assets		Estimated Fair Value of Liabilities		Estimated Fair Value of Assets		Estimated Fair Value of Liabilities
	(in billions of Won)
Currency derivatives	￦	1,441	￦	1,439	￦	2,331	￦	2,246	￦	2,732	￦	2,782
Interest rate derivatives		938		975		491		532		236		267
Equity derivatives		—		155		73		229		147		100
Commodity derivatives		11		12		3		3		1		1
Total	￦	2,390	￦	2,581	￦	2,898	￦	3,010	￦	3,116	￦	3,150

For a discussion of our risk management policies with respect to our derivatives trading activities, see “Item 11. Quantitative and Qualitative Disclosures about Market Risk—Market Risk Management—Market Risk Management for Trading Activities.”

Asset Securitization Services

We are active in the Korean asset-backed securities market. We participate in asset securitization transactions in Korea by acting as arranger, trustee or liquidity provider. In 2017, we were involved in asset securitization transactions with an initial aggregate issue amount of ￦583 billion and generated total fee income

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of approximately ￦16 billion in connection with such transactions. The securities issued in asset securitization transactions are sold mainly to institutional investors buying through Korean securities firms.

Investment Banking

We engage in investment banking activities in Korea. In addition, we provide project finance and financial advisory services, in the area of social overhead capital projects such as highway, port, power and water and sewage projects, as well as structured finance, leveraged buy-out financing, equity and venture financing and mergers and acquisitions financing services. In 2017, we generated investment banking revenue of approximately ￦153 billion from gains on investment in foreign bonds and equity securities and fees from advisory and other services.

We believe that significant opportunities exist for us to leverage our existing base of large corporate and small- and medium-sized banking customers to cross-sell investment banking services. We intend to expand our investment banking operations to take advantage of these opportunities, with a view to increasing our fee income and further diversifying our revenue base.

International Banking

We engage in various international banking activities, including foreign exchange services and dealing, import and export-related services, offshore lending, syndicated loans and foreign currency securities investment. These services are provided primarily to our domestic customers and overseas subsidiaries and affiliates of Korean corporations and, to a limited extent, to local companies and individuals. We also raise foreign currency funding through our international banking operations. In addition, we provide commercial banking services to retail and corporate customers in select overseas markets.

The table below sets forth certain information regarding our foreign currency assets and borrowings:

	As of December 31,
	2015		2016		2017
	(in millions of US$)
Total foreign currency assets	US$	33,329	US$	33,670	US$	35,678
Foreign currency borrowings
Call money	US$	1,097	US$	1,131	US$	593
Long-term borrowings		4,883		4,841		4,290
Short-term borrowings		7,247		4,797		6,191
Total foreign currency borrowings	US$	13,227	US$	10,769	US$	11,074

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The table below sets forth our overseas subsidiaries and direct branches in operation as of December 31, 2017:

Business Unit(1)	Location
Subsidiaries:
Woori America Bank	United States
PT Bank Woori Saudara Indonesia 1906, Tbk	Indonesia
Woori Global Markets Asia Limited	China (Hong Kong)
Woori Bank (China) Limited	China
AO Woori Bank	Russia
Banco Woori Bank do Brasil S.A.	Brazil
Woori Finance Cambodia	Cambodia
Woori Finance Myanmar	Myanmar
Wealth Development Bank Corp.	Philippines
Woori Bank Vietnam	Vietnam
Branches, Agencies and Representative Offices:
London Branch	United Kingdom
Tokyo Branch	Japan
Singapore Branch	Singapore
Hong Kong Branch	China (Hong Kong)
Bahrain Branch	Bahrain
Dhaka Branch	Bangladesh
Gaeseong Branch	Korea(2)
New York Agency	United States
Los Angeles Branch	United States
Chennai Branch	India
Sydney Branch	Australia
Dubai Branch	United Arab Emirates
Gurgaon Branch	India
Mumbai Branch	India
Kuala Lumpur Representative Office	Malaysia
Yangon Representative Office	Myanmar
Iran Representative Office	Iran
Katowice Representative Office	Poland

⁽¹⁾  Does not include subsidiaries and branches in liquidation or dissolution.

⁽²⁾  Due to the shutdown of the Gaeseong Industrial Complex in February 2016, the Gaeseong Branch is currently located at our corporate headquarters in Seoul.

The principal activities of our overseas branches and subsidiaries are providing trade financing and local currency funding for Korean companies and Korean nationals operating in overseas markets as well as servicing local customers and providing foreign exchange services in conjunction with our headquarters. On a limited basis, such overseas branches and subsidiaries also engage in the investment and trading of securities of foreign issuers.

Woori America Bank currently operates 21 branches in New York, New Jersey, Maryland, Virginia, Pennsylvania and California and provides retail and corporate banking services targeted towards the Korean-American community. Woori America Bank had total assets of US$1,831 million as of December 31, 2017 and net profit of US$10 million in 2017.

In November 2007, we established a local subsidiary in China, Woori Bank (China) Limited, which currently has branches in Beijing, Shanghai, Shenzhen, Suzhou, Tianjin, Dalian, Chengdu, Weihai, Chongqing and Shenyang. We also established a local subsidiary in Russia, AO Woori Bank, in January 2008 and it currently has branches in Moscow and St. Petersburg and a representative office in Vladivostok.

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In January 2014, we completed the purchase of an additional 27% equity interest (in addition to the 6% equity interest we previously acquired through our subsidiary PT. Bank Woori Indonesia) in PT. Bank Himpunan Saudara 1906, an Indonesian commercial bank with a network of over 100 branches and offices throughout Indonesia. In December 2014, PT. Bank Woori Indonesia merged with and into PT. Bank Himpunan Saudara 1906. The merged entity, in which we hold a 79.9% equity interest, was renamed PT Bank Woori Saudara Indonesia 1906, Tbk and became our consolidated subsidiary. As of December 31, 2017, PT Bank Woori Saudara Indonesia 1906, Tbk had total assets of approximately US$2,090 million and shareholders’ equity of US$455 million.

In May 2016, we established a new representative office in Tehran, Iran, in light of the lifting of certain international sanctions against Iran, including U.S. secondary sanctions. The representative office engages only in the collection of local market information and does not conduct any banking operations.

In October 2016, we acquired a 51% equity interest in Wealth Development Bank Corp., a thrift bank in the Philippines with a network of 16 branches and approximately 300 employees, by purchasing newly issued shares for approximately US$21 million.

In November 2016, we established a local subsidiary in Vietnam, Woori Bank Vietnam, which commenced operations in January 2017 and currently operates the branches in Hanoi, Bac Ninh and Ho Chi Minh City that we previously operated directly.

We are also expanding our network of branches in South and Southeast Asia through our other local subsidiaries, including PT Bank Woori Saudara Indonesia 1906, Tbk, Woori Finance Myanmar, Wealth Development Bank Corp. and Woori Finance Cambodia.

Asset Management

Trust Management Services

Money Trusts. We offer money trust products to our customers and manage the funds they invest in money trusts. The money trusts we manage are generally trusts with a fixed life that allow investors to share in the investment performance of the trust in proportion to the amount of their investment in the trust. We principally offer the following types of money trust products:

• retirement trusts, which invest funds received from corporations or organizations and manage these funds until they are withdrawn to pay retirement funds to a corporation’s officers or employees or an organization’s members;

• pension trusts, which invest funds received until pension benefits are due to be disbursed to a pension beneficiary; and

• specified money trusts, which invest cash received as trust property at the direction of the trustors and, once the trust matures, disburse the principal and any gains to the trust beneficiaries.

We also offer other types of money trusts that have a variety of differing characteristics with respect to, for example, maturities and tax treatment.

Under Korean law, the assets of our money trusts are segregated from our assets and are not available to satisfy the claims of our creditors. We are, however, permitted to maintain deposits of surplus funds generated by trust assets in certain circumstances as set forth under the Financial Investment Services and Capital Markets Act and the regulations thereunder. Except for specified money trusts, we have investment discretion over all money trusts, which are pooled and managed jointly for each type of trust. Specified money trusts are established on behalf of individual customers, typically corporations, which direct our investment of trust assets.

We receive fees for our trust management services that are generally based upon a percentage, ranging between 0.01% and 2.0%, of the net asset value of the assets under management. We also receive penalty payments when customers terminate their trust deposit prior to the original contract maturity. Fees that we received for trust management services (including those fees related to property trust management services,

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described below, but excluding those fees relating to guaranteed trusts, which are eliminated in consolidation), net of expenses, amounted to ￦49 billion in 2015, ￦78 billion in 2016 and ￦142 billion in 2017.

For some of the money trusts we manage, we have guaranteed the principal amount of an investor’s investment as well as a fixed rate of interest. We no longer offer new money trust products where we guarantee both the principal amount and a fixed rate of interest. We continue to offer pension-type money trusts that provide a guarantee of the principal amount of an investor’s investment.

The following table shows the balances of our money trusts by type as of the dates indicated. We consolidate within our financial statements trust accounts for which we guarantee both the repayment of the principal amount and a fixed rate of interest and trust accounts for which we guarantee only the repayment of the principal amount, while we do not consolidate performance trusts on which we do not guarantee principal or interest:

	As of December 31,
	2015		2016		2017
	(in billions of Won)
Principal and interest guaranteed trusts	￦	1	￦	1	￦	1
Principal guaranteed trusts		1,287		1,344		1,401
Performance trusts		21,324		25,767		29,252
Total	￦	22,612	￦	27,112	￦	30,654

The trust assets we manage consist principally of investment securities, loans made from the trusts and amounts due from banks. The investment securities consist of government-related debt securities, corporate debt securities, including bonds and commercial paper, equity securities and other securities. As of December 31, 2017, our money trusts had invested in securities with an aggregate book value of ￦9,712 billion, which accounted for approximately 22.1% of our money trust assets. Debt securities accounted for ￦4,156 billion of this amount.

Our money trusts also invest, to a lesser extent, in equity securities, including beneficiary certificates issued by investment trust management companies. As of December 31, 2017, equity securities held by our money trusts amounted to ￦5,556 billion, which accounted for approximately 12.7% of our money trust assets. Of this amount, ￦1,248 billion was from money trusts over which we had investment discretion and the remainder was from specified money trusts.

Loans made by our money trusts are similar in type to the loans made by our banking operations. As of December 31, 2017, our money trusts had made loans in the aggregate principal amount of ￦12,852 billion (excluding loans to our banking operations of ￦2,712 billion), which accounted for approximately 29.3% of our money trust assets.

The amounts due from banks consist of local currency and foreign currencies. As of December 31, 2017, such amounts due from banks totaled ￦13,349 billion, which accounted for approximately 30.4% of our money trust assets.

If the income from a money trust for which we provide a guarantee is less than the amount of the payments we have guaranteed, we will need to pay the amount of the shortfall with funds from special reserves maintained in our trust accounts, followed by basic fees from that money trust and funds from our banking operations. We net any payments we make as a result of these shortfalls against any gains we receive from other money trusts. No material payments of any such shortfall amounts were made in 2017.

Property Trusts.  We also offer property trust management services, where we manage non-cash assets in return for a fee. Non-cash assets include mostly receivables (including those securing asset-backed securities), real property and securities, but can also include movable property such as artwork. Under these arrangements, we render escrow or custodial services for the property in question and collect fees in return.

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In 2017, our property trust fees generally ranged from 0.003% to 0.04% of total assets under management, depending on the type of trust account product. As of December 31, 2017, the balance of our property trusts totaled ￦12,608 billion.

Property trusts are not consolidated within our financial statements.

Trustee and Custodian Services Relating to Securities Investment Trusts

As of December 31, 2017, we acted as a trustee for 2,491 securities investment trusts, mutual funds and other investment funds. We receive a fee for acting as a trustee and generally perform the following functions:

• receiving payments made in respect of such securities;

• executing trades in respect of such securities on behalf of the investment fund, based on instructions from the relevant investment fund management company; and

• in certain cases, authenticating beneficiary certificates issued by investment trust management companies and handling settlements in respect of such beneficiary certificates.

For the year ended December 31, 2017, our fee income from such services was ￦12 billion.

Other Businesses

Management of National Housing Urban Fund

In April 2008, we were selected to be the lead manager of the National Housing Urban Fund. The National Housing Urban Fund provides financial support to low-income households in Korea by providing mortgage financing and construction loans for projects to build small- and medium-sized housing. As of December 31, 2017, outstanding housing loans from the National Housing Urban Fund amounted to approximately ￦95.9 trillion, of which we originated approximately ￦50.9 trillion. The activities of the National Housing Urban Fund are funded primarily by the issuance of national housing bonds, which must be purchased by persons and legal entities wishing to make real estate-related registrations and filings, and by subscription savings deposits held at the National Housing Urban Fund.

In return for managing the operations of the National Housing Urban Fund, we receive a monthly fee. This fee consists of a fund raising fee, a loan origination fee and a management fee. The fund raising fee is based on the number of National Housing Urban Fund subscription savings deposit accounts opened and the level of activity for existing accounts and the number of National Housing Urban Fund bonds issued or redeemed. The loan origination fee is based on the number of new National Housing Urban Fund loans and the number of National Housing Urban Fund mortgage loans to contractors constructing housing units that are assumed by the individual buyers of housing units and the level of activity for existing loans during each month. The management fee is based on the monthly average of the number of outstanding accounts and the monthly average of the number of overdue loans owed to the National Housing Urban Fund. We received total fees of approximately ￦51 billion for managing the National Housing Urban Fund in 2017.

Bancassurance

The term “bancassurance” refers to the marketing and sale by commercial banks of insurance products manufactured within a group of affiliated companies or by third-party insurance companies. We market a wide range of bancassurance products. In 2017, we generated fee income of approximately ￦86.5 billion through the marketing of bancassurance products. We believe that we will be able to continue to develop an important new source of fee-based revenues by expanding our offering of these products. We have entered into bancassurance marketing arrangements with 29 insurance companies, including Samsung Life Insurance, Samsung Fire and Marine Insurance, Hanwha Life Insurance, Hyundai Fire and Marine Insurance and American International Assurance, and plan to enter into additional insurance product marketing arrangements with other leading insurance companies whose names and reputation are likely to be familiar to our customer base.

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Private Equity

In 2016, Woori Private Equity Co., Ltd., which was established in October 2005, registered as a specialized private placement collective investment business under the Financial Investment Services and Capital Markets Act and changed its name to Woori Private Equity Asset Management Co., Ltd., or Woori PEAM. Such registration enabled it to manage specialized private placement collective investment vehicles (which include hedge funds) targeting professional investors, in addition to its existing business of making long-term and strategic investments in buyout target companies and actively involving itself in their management. In 2017, three of the private equity funds for which Woori PEAM acted as general partner, Woori Private Equity Fund, the size of which was approximately ￦344 billion, Woori Blackstone Korea Opportunity Private Equity Fund I, the size of which was approximately ￦606 billion, and Woori Columbus Private Equity Fund I, the size of which was approximately ￦61 billion, were successfully liquidated after meeting their respective investment objectives. We expect that Woori PEAM will continue to provide us with investment opportunities, through identifying potential investees suffering from inefficient management and effecting financial restructuring and strategic reorientation in those investees so as to enhance their enterprise value, as well as serve as a source of business for other segments by managing specialized private placement collective investment vehicles for professional investors.

Competition

We compete with other financial institutions in Korea, including principally nationwide and regional Korean commercial banks and branches of foreign banks operating in Korea. In addition, in particular segments such as credit cards, asset management and bancassurance, we compete with specialized financial institutions focusing on such segments. Some of the financial institutions we compete with are larger in terms of asset size and customer base and have greater financial resources or more specialized capabilities than us.

Competition in the Korean financial market has been and is likely to remain intense. In particular, in the area of our core banking operations, most Korean banks have been focusing on retail customers and small- and medium-sized enterprises in recent years, although they have begun to increase their exposure to large corporate borrowers, and have been focusing on developing fee income businesses, including bancassurance, as increasingly important sources of revenue. In the area of credit cards, Korean banks and credit card companies have in the past engaged in aggressive marketing activities and made significant investments, contributing to some extent to the lower profitability and asset quality problems previously experienced with respect to credit card receivables.

In addition, general regulatory reforms in the Korean financial industry have increased competition among banks and other financial institutions in Korea. In the second half of 2015, the Korean government implemented measures to facilitate bank account portability of retail customers by requiring commercial banks to establish systems that allow retail customers to easily switch their bank accounts at one commercial bank to another and automatically transfer the automatic payment settings of their former accounts to the new ones. Such measures are expected to further intensify competition among financial institutions in Korea.

Furthermore, the introduction of Internet-only banks in Korea is expected to increase competition in the Korean banking industry. Internet-only banks generally operate without branches and conduct most of their operations through electronic means, which enable them to minimize costs and offer customers higher interest rates on deposits or lower lending rates. In April 2017, K bank, the first Internet-only bank in Korea, in which we own 13.8% of the equity with voting rights, commenced operations. Kakao Bank, a mobile-only bank, commenced operations in July 2017.

Moreover, in March 2016, the Financial Services Commission introduced an individual savings account scheme in Korea, which enables individuals to efficiently manage a wide range of retail investment vehicles, including cash deposits, investment funds and securities investment products, from a single integrated account with one financial institution and offers tax benefits on investment returns. Since the scheme backed by the Korean government allows only one individual savings account per person, financial institutions have been competing to retain existing customers and attract new customers since the launch of the individual savings

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account scheme. Over 30 financial institutions, including banks, securities companies and insurance companies, have registered with the Financial Services Commission to sell their individual savings account products, and competition among these financial institutions is expected to remain intense.

Moreover, the Korean financial industry is undergoing significant consolidation. The number of nationwide commercial banks in Korea has decreased from 16 as of December 31, 1997 to six as of December 31, 2017. A number of significant mergers and acquisitions in the industry have taken place in Korea in recent years, including Hana Financial Group’s acquisition of a controlling interest in Korea Exchange Bank in 2012, the subsequent merger of Hana Bank into Korea Exchange Bank in 2015, KB Financial Group’s acquisition of Hyundai Securities Co., Ltd. in 2016 and the subsequent merger of Hyundai Securities with and into KB Investment & Securities Co., Ltd. in 2016. In 2016, Mirae Asset Securities Co., Ltd. acquired a 43% interest in KDB Daewoo Securities Co., Ltd., which changed its name to Mirae Asset Daewoo Securities Co., Ltd., and subsequently merged with and into Mirae Asset Daewoo Securities to create the largest securities company in Korea in terms of capital. Furthermore, in 2014, pursuant to the implementation of the Korean government’s privatization plan with respect to Woori Finance Holdings and its former subsidiaries, Woori Financial, Woori Asset Management and Woori F&I were acquired by KB Financial Group, Kiwoom Securities and Daishin Securities, respectively, and Woori Investment & Securities, Woori Aviva Life Insurance and Woori FG Savings Bank were acquired by NongHyup Financial Group. In addition, in October 2014, the KDIC’s ownership interest in Kwangju Bank and Kyongnam Bank were acquired by JB Financial Group and BS Financial Group, respectively. See “Item 4.A. History and Development of the Company—Privatization Plan.”

We expect that consolidation in the Korean financial industry will continue. Other financial institutions may seek to acquire or merge with other entities, and the financial institutions resulting from this consolidation may, by virtue of their increased size and business scope, provide significantly greater competition for us. We also believe that foreign financial institutions, many of which have greater experience and resources than we do, may seek to compete with us in providing financial products and services either by themselves or in partnership with existing Korean financial institutions. See “Item 3.D. Risk Factors—Risks relating to competition.”

Assets and Liabilities

The tables below and accompanying discussions provide selected financial highlights regarding our assets and liabilities on a consolidated basis.

Certain information with respect to our loan portfolio and the asset quality of our loans is presented below on a basis consistent with certain requirements of the Financial Services Commission applicable to Korean financial institutions, which differs (as described below where applicable) from the presentation of such information in our financial statements prepared in accordance with IFRS, as we believe that such alternative presentation allows us to provide additional details regarding our loan portfolio and the asset quality of our loans which would be helpful to our investors.

Loan Portfolio

As of December 31, 2017, the balance of our total loan portfolio was ￦252,793 billion. As of December 31, 2017, 89.4% of our total loans were Won-denominated loans and 10.6% of our total loans were denominated in other currencies. Of the ￦26,827 billion of foreign currency-denominated loans as of that date, approximately 54.7% represented “foreign” loans to offshore entities and individuals. We make foreign loans primarily through our overseas branches to affiliates of large Korean manufacturing companies for trade financing and working capital.

Except where we specify otherwise, all loan amounts stated below do not include amounts due from banks and other receivables and are prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs, and all corporate loan amounts stated below include loans made to the Korean government and government-owned agencies and banks.

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Loan Types

The following table presents loans by type as of the dates indicated. Total loans reflect our loan portfolio, including past due amounts.

	As of December 31,
	2013(1)			2014			2015			2016			2017
	(in billions of Won)
Domestic:
Corporate(2):
Commercial and industrial	￦	91,058		￦	89,410		￦	92,802		￦	88,968		￦	93,320
Lease financing		—			—			—			7			25
Trade financing		10,296			11,937			11,446			10,699			9,290
Other commercial		9,690			11,440			12,229			12,923			21,283
Total corporate		111,044			112,787			116,477			112,597			123,918
Consumer:
General purpose household		25,094			25,070			26,971			30,684			34,374
Mortgage		19,952			28,988			40,598			47,630			47,476
Home equity		25,732			25,340			24,657			24,486			25,513
Total consumer		70,778			79,398			92,226			102,800			107,363
Credit cards		4,209			5,114			6,099			6,674			6,827
Total domestic		186,031			197,299			214,802			222,071			238,108
Foreign:
Corporate(3):
Commercial and industrial		6,961			7,989			9,518			10,540			9,632
Trade financing		319			725			1,421			2,156			2,655
Other commercial		192			245			206			350			471
Total corporate		7,472			8,959			11,145			13,046			12,758
Consumer		263			819			1,222			1,684			1,927
Total foreign		7,735			9,778			12,367			14,730			14,685
Total loans(4)	￦	193,766		￦	207,077		￦	227,169		￦	236,801		￦	252,793
Less: present value discount		(25	)		(17	)		(5	)		(14	)		(11	)
Less: deferred origination costs (fees)		295			368			435			464			511
Less: allowance for credit losses		(3,337	)		(2,609	)		(2,051	)		(1,851	)		(1,770	)
Total loans, net	￦	190,699		￦	204,819		￦	225,548		￦	235,400		￦	251,523

⁽¹⁾  The amounts as of December 31, 2013 exclude certain former subsidiaries classified as a disposal group held for distribution or sale.

⁽²⁾  Including loans made to banks and the Korean government and government-owned agencies.

⁽³⁾  Including loans made to banks.

⁽⁴⁾  Not including due from banks and other receivables.

Loan Concentrations

We limit our total exposure to any single borrower as required by Korean regulations and pursuant to our internal policies and determine this limit based on the borrower’s credit rating provided by our CREPIA system. We may adjust our limit if such limit would otherwise exceed the limit imposed by Korean regulations. See “—Supervision and Regulation—Principal Regulations Applicable to Banks—Financial Exposure to Any Individual Customer or Major Shareholder.”

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20 Largest Exposures by Borrower

As of December 31, 2017, our exposures to our 20 largest borrowers or issuers totaled ￦47,540 billion and accounted for 12.5% of our total exposures. The following table sets forth our total exposures to those borrowers or issuers as of that date:

	Loans
Company (Credit Rating)(1)	Won currency		Foreign currency		Equity securities		Debt securities		Guarantees and acceptances		Total exposures		Collateral(2)		Amounts classified as substandard or below(3)
	(in billions of Won)
The Bank of Korea(4)	￦	1,420	￦	—	￦	—	￦	6,610	￦	—	￦	8,030	￦	—	￦	—
Korean Government(4)		—		—		—		6,760		—		6,760		—		—
Korea Development Bank (AAA)		—		6		—		4,253		—		4,259		—		—
Korea Housing Finance Corporation (AAA)		—		—		—		3,172		—		3,172		—		—
Korea Land & Housing Corporation (AAA)		465		—		—		2,516		—		2,981		—		—
Samsung Electronics (AA)		200		2,274		5		—		—		2,479		—		—
Mirae Asset Daewoo (AA+)		2,413		—		—		—		—		2,413		—		—
NH Investment & Securities (AA+)		2,332		—		—		—		—		2,332		—		—
Shinhan Investment (AAA)		1,780		—		—		—		—		1,780		—		—
Meritz Securities (AA-)		1,628		—		—		—		—		1,628		—		—
Industrial Bank of Korea (AAA)		64		24		—		1,496		—		1,584		—		—
Kyobo Securities (A+)		1,284		—		—		—		—		1,284		—		—
Samsung Securities (AA+)		1,280		—		—		—		—		1,280		—		—
KB Securities (AA)		1,270		—		—		—		—		1,270		—		—
Korea Securities Finance Corp. (AAA)		1,100		—		71		—		—		1,171		—		—
Hana Financial Investment (AA)		1,120		—		—		—		—		1,120		—		—
Defense Acquisition Program Administration(4)		—		—		—		—		1,114		1,114		—		—
Korea Investment & Securities (AA)		1,063		—		—		—		—		1,063		—		—
Samsung Heavy Industries (BBB+)		100		46		—		—		793		939		50		—
Export-Import Bank of Korea (AAA)		1		—		—		880		—		881		—		—
Total	￦	17,520	￦	2,350	￦	76	￦	25,687	￦	1,907	￦	47,540	￦	50	￦	—

⁽¹⁾  Credit ratings are from one of the domestic credit rating agencies in Korea, including Korea Ratings Corporation, NICE Investors Service Co. and Korea Information Service Inc., as of December 31, 2017. If multiple ratings were available, the lowest one is indicated.

⁽²⁾  The value of collateral is appraised based on future cash flow and observable market price.

⁽³⁾  Classification is based on the Financial Services Commission’s asset classification criteria.

⁽⁴⁾  Credit rating is unavailable.

As of December 31, 2017, five of these top 20 borrowers or issuers were companies belonging to the 24 largest chaebol in Korea. See “Item 3.D. Risk Factors—Risks relating to our corporate credit portfolio—We have exposure to the largest Korean commercial conglomerates, known as “chaebols,” and, as a result, financial difficulties of chaebols may have an adverse impact on us.”

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Exposure to Chaebols

As of December 31, 2017, 6.6% of our total exposure was to the 24 largest chaebols in Korea. The following table shows, as of December 31, 2017, our total exposures to the 10 chaebols to which we have the largest exposure:

	Loans
Chaebol	Won currency		Foreign currency		Equity securities		Debt securities		Guarantees and acceptances		Total exposures		Collateral(1)		Amounts Classified as substandard or below(2)
	(in billions of Won)
Samsung	￦	1,702	￦	3,180	￦	8	￦	20	￦	1,359	￦	6,269	￦	139	￦	—
Hyundai Motors		1,609		808		1		76		376		2,870		26		—
Mirae Asset		2,453		—		—		—		—		2,453		—		—
Hyundai Heavy Industries		684		108		—		—		1,048		1,840		11		—
SK		830		323		1		7		501		1,662		—		—
LG		948		277		1		20		108		1,354		6		—
Hanwha		867		134		—		55		91		1,147		156		—
Korea Investment		1,131		—		—		—		—		1,131		—		—
Doosan		435		104		—		—		492		1,031		101		—
Lotte		709		122		1		—		111		943		19		—
Total	￦	11,368	￦	5,056	￦	12	￦	178	￦	4,086	￦	20,700	￦	458	￦	—

⁽¹⁾  The value of collateral is appraised based on future cash flow and observable market price.

⁽²⁾  Classification is based on the Financial Services Commission’s asset classification criteria.

Loan Concentration by Industry

The following table shows, as of December 31, 2017, the aggregate balance of our domestic and foreign corporate loans by industry concentration and as a percentage of our total corporate lending:

	Aggregate corporate loan balance		Percentage of total corporate loan balance
	(in billions of Won)
Industry
Manufacturing	￦	36,189		26.4	%
Financial and insurance		25,084		18.4
Retail and wholesale		17,036		12.5
Hotel, leisure or transportation		7,378		5.4
Construction		4,503		3.3
Government and government agencies		311		0.2
Other		46,175		33.8
Total	￦	136,676		100.0	%

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Maturity Analysis

The following table sets out, as of December 31, 2017, the scheduled maturities (time remaining until maturity) of our loan portfolio:

	1 year or less		Over 1 year but not more than 5 years		Over 5 years		Total
	(in billions of Won)
Domestic
Corporate(1)
Commercial and industrial	￦	62,779	￦	24,970	￦	5,571	￦	93,320
Lease financing		—		25		—		25
Trade financing		9,290		—		—		9,290
Other commercial		18,438		2,085		760		21,283
Total corporate		90,507		27,080		6,331		123,918
Consumer
General purpose household		19,219		6,399		8,756		34,374
Mortgage		10,827		9,945		26,704		47,476
Home equity		3,737		3,437		18,339		25,513
Total consumer		33,783		19,781		53,799		107,363
Credit cards		5,997		766		64		6,827
Total domestic		130,287		47,627		60,194		238,108
Foreign
Corporate(2)
Commercial and industrial		5,635		3,122		875		9,632
Trade financing		2,655		—		—		2,655
Other commercial		260		175		36		471
Total corporate		8,550		3,297		911		12,758
Consumer
Other consumer		168		478		1,281		1,927
Total foreign		8,718		3,775		2,192		14,685
Total loans	￦	139,005	￦	51,402	￦	62,386	￦	252,793

⁽¹⁾  Including loans made to banks and the Korean government and government-owned agencies.

⁽²⁾  Including loans made to banks.

A significant portion of our loans with maturities of one year is renewed annually. We typically roll over our working capital loans and consumer loans (other than those payable in installments) after we conduct our normal loan review in accordance with our loan review procedures. Under our internal guidelines, we may generally extend working capital loans on an annual basis for an aggregate term of five years. Those guidelines also allow us to generally extend consumer loans other than home equity loans for another term on an annual basis for an aggregate term of up to five years (and home equity loans for an aggregate term of up to 10 years).

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Interest Rates

The following table shows, as of December 31, 2017, the total amount of our loans due after one year that have fixed interest rates and variable or adjustable interest rates:

	Domestic		Foreign		Total
	(in billions of Won)
Fixed rate(1)	￦	34,933	￦	2,206	￦	37,139
Variable or adjustable rates(2)		72,888		3,761		76,649
Total loans	￦	107,821	￦	5,967	￦	113,788

⁽¹⁾  Fixed rate loans are loans for which the interest rate is fixed for the entire term.

⁽²⁾  Variable or adjustable rate loans are loans for which the interest rate is not fixed for the entire term.

For additional information regarding our management of interest rate risk, see “Item 11. Quantitative and Qualitative Disclosures about Market Risk—Market Risk Management—Asset and Liability Management.”

Asset Quality of Loans

Except where we specify otherwise, all loan amounts stated below do not include amounts due from banks and other receivables and are prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs, and all corporate loan amounts stated below include loans made to the Korean government and government-owned agencies and banks.

Loan Classifications

The Financial Services Commission generally requires Korean financial institutions to analyze and classify their assets by quality into one of five categories for reporting purposes. In making these classifications, we take into account a number of factors, including the financial position, profitability and transaction history of the borrower, and the value of any collateral or guarantee taken as security for the extension of credit. This classification method, and our related provisioning policy, is intended to fully reflect the borrower’s capacity to repay.

The following is a summary of the asset classification criteria we apply for corporate and consumer loans, based on the asset classification guidelines of the Financial Services Commission. Credit card receivables are subject to classification based on the number of days past due, as required by the Financial Services Commission. We also apply different criteria for other types of credits such as loans to the Korean government or to government-related or controlled entities, certain bills of exchange and certain receivables.

Asset Classification	Characteristics
Normal	Credits extended to customers that, based on our consideration of their business, financial position and future cash flows, do not raise concerns regarding their ability to repay the credits.
Precautionary	Credits extended to customers that:
	•  based on our consideration of their business, financial position and future cash flows, show potential risks with respect to their ability to repay the credits, although showing no immediate default risk; or
	•  are in arrears for one month or more but less than three months.
Substandard	Either:
	•  credits extended to customers that, based on our consideration of their business, financial position and future cash flows, are judged to have incurred considerable default risks as their ability to repay has deteriorated; or

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Asset Classification	Characteristics
	•  the portion that we expect to collect of total loans (1) extended to customers that have been in arrears for three months or more, (2) extended to customers that have incurred serious default risks due to the occurrence of, among other things, final refusal to pay their debt instruments, entry into liquidation or bankruptcy proceedings, or closure of their businesses, or (3) extended to customers who have outstanding loans that are classified as “doubtful” or “estimated loss.”
Doubtful	Credits exceeding the amount we expect to collect of total credits to customers that:
	•  based on our consideration of their business, financial position and future cash flows, have incurred serious default risks due to noticeable deterioration in their ability to repay; or
	•  have been in arrears for three months or more but less than twelve months.
Estimated Loss	Credits exceeding the amount we expect to collect of total credits to customers that:
	•  based on our consideration of their business, financial position and future cash flows, are judged to have to be accounted as a loss as the inability to repay became certain due to serious deterioration in their ability to repay;
	•  have been in arrears for twelve months or more; or
	•  have incurred serious risks of default in repayment due to the occurrence of, among other things, final refusal to pay their debt instruments, liquidation or bankruptcy proceedings or closure of their business.

Loan Loss Provisioning Policy

Under International Accounting Standard 39, Financial Instruments: Recognition and Measurement, we establish allowances for credit losses with respect to loans using either a case-by-case or collective approach. We assess individually significant loans on a case-by-case basis and other loans on a collective basis. In addition, if we determine that no objective evidence of impairment exists for a loan, we include such loan in a group of loans with similar credit risk characteristics and assess them collectively for impairment regardless of whether such loan is significant. If there is objective evidence that an impairment loss has been incurred for individually significant loans, the amount of the loss is measured as the difference between the financial asset’s carrying amount and the present value of the estimated future cash flows discounted at such asset’s original effective interest rate. Future cash flows are estimated through a case-by-case analysis of individually assessed assets, which takes into account the benefit of any guarantee or other collateral held. The value and timing of future cash flow receipts are based on available estimates in conjunction with facts available at the time of review and reassessed on a periodic basis as new information becomes available.

For collectively assessed loans, we base the level of allowance for credit losses on a portfolio basis in light of the homogenous nature of the assets included in each portfolio. The allowances are determined based on a quantitative review of the relevant portfolio, taking into account such factors as the level of arrears, the value of any security, and historical and projected cash recovery trends over the recovery period. The methodologies we use to estimate collectively assessed allowances reflect the probability that the performing customer will default, our historical loss experience (as adjusted by current economic and credit conditions where appropriate) and the emergence period between an impairment event occurring and a loan being identified and reported as impaired.

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IFRS 9 Financial Instruments is effective, and replaces International Accounting Standard 39, for annual periods commencing on or after January 1, 2018. See “Item 5.B. Liquidity and Capital Resources—Recent Accounting Pronouncements.” IFRS 9 introduces a new impairment model which requires the calculation of allowance for credit losses based on expected credit losses instead of incurred losses (as is the case under International Accounting Standard 39) by assessing changes in expected credit losses and recognizing such changes as impairment loss (or reversal of impairment loss) in profit or loss. Under IFRS 9, the allowance required to be established with respect to a loan or receivable is the amount of the expected 12-month credit loss or the expected lifetime credit loss for the applicable loan or receivable, according to three stages of credit risk deterioration since initial recognition.

If additions or changes to the allowance for credit losses are required, then we record provisions for credit loss, which are included in impairment losses due to credit loss and treated as charges against current income. Credit exposures that we deem to be uncollectible, including actual loan losses, net of recoveries of previously charged-off amounts, are charged directly against the allowance for credit losses. See “Item 5.A. Operating Results—Critical Accounting Policies—Impairment of Loans and Allowance for Credit Losses.”

We consider the following loans to be impaired loans:

• loans that are past due by 90 days or more;

• loans that are subject to legal proceedings related to collection;

• loans to a borrower that has received a warning from the Korea Federation of Banks indicating that such borrower has exhibited difficulties in making timely payments of principal and interest;

• loans to corporate borrowers that are rated “D” according to our internal credit ratings;

• restructured loans; and

• individually significant loans classified as precautionary based on the asset classification criteria of the Financial Services Commission, where the borrower is subject to complete capital impairment or has received an adverse audit opinion or disclaimer of opinion on its financial statements.

In addition, if our allowance for credit losses is deemed insufficient for regulatory purposes, we compensate for the difference by recording a planned regulatory reserve for credit loss, which is segregated within our retained earnings. The level of planned regulatory reserve for credit loss required to be recorded is equal to the amount by which our allowance for credit losses under IFRS is less than the greater of (x) the amount of expected loss calculated using the internal ratings-based approach under Basel II and as approved by the Financial Supervisory Service and (y) the required amount of credit loss reserve calculated based on guidelines prescribed by the Financial Services Commission. The following table sets forth the Financial Services Commission’s guidelines applicable to banking institutions for the minimum percentages of the outstanding principal amount of the relevant loans or balances that the credit loss reserve must cover:

Loan classifications	Corporate(1)	Consumer	Credit card receivables(2)	Credit card loans(3)
Normal	0.85% or above	1% or above	1.1% or above	2.5% or above
Precautionary	7% or above	10% or above	40% or above	50% or above
Substandard	20% or above	20% or above	60% or above	65% or above
Doubtful	50% or above	55% or above	75% or above	75% or above
Estimated loss	100%	100%	100%	100%

⁽¹⁾  Subject to certain exceptions pursuant to the Banking Industry Supervision Regulations of Korea.

⁽²⁾  Applicable for credit card receivables for general purchases of products or services.

⁽³⁾  Applicable for cash advances, card loans and revolving loan receivables.

The process to determine the allowances for off-balance sheet positions under IFRS is similar to the methodology used for loans. Any loss amounts are recognized as a provision in the consolidated statements of financial position within liabilities and charged to the consolidated statement of income as a component of the impairment losses due to credit loss.

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The actual amount of credit losses we incur may differ from our loss estimates as a result of changing economic conditions, changes in industry or geographic concentrations, or other factors. We monitor the differences between our estimated and actual incurred credit losses, and we undertake detailed periodic assessments of both individual loans and credit portfolios, the models we use to estimate incurred credit losses in those portfolios and the adequacy of our overall allowances.

Problem Loans and Past Due Accruing Loans

We monitor and manage our “problem loans” by generally placing loans on “problem loan” status when payments of interest and/or principal become past due by 90 days. In addition, the following types of loans are classified as problem loans by us even if such loans are not past due:

• Loans to creditors with dishonored notes or checks;

• Loans for which interest payments are reduced or postponed (e.g., through work-out procedures or debt restructurings); and

• Loans to creditors included in the “watch list” maintained by the Korea Federation of Banks.

We reclassify loans as non-problem loans when interest and principal payments are up-to-date and future payments of principal and interest are reasonably assured. In applying payments on problem loans, we first apply payments to the delinquent interest outstanding, then to non-delinquent interest, and then to the outstanding loan balance until the loan is paid in full.

Foregone interest is the portion of the contractual interest due on problem loans that we have not accrued in our books. If we had not foregone interest on our problem loans, we would have recorded gross interest income of ￦164 billion, ￦104 billion and ￦74 billion for 2015, 2016 and 2017, respectively, on loans accounted for as problem loans throughout the year, or since origination for loans held for part of the year. The actual amount of interest income on those loans included in our net income for 2015, 2016 and 2017 was ￦41 billion, ￦47 billion and ￦34 billion, respectively.

The category “accruing loans which are contractually past due 90 days or more as to principal or interest” includes loans that are still accruing interest based on the contractual rate of interest but on which principal or interest payments are contractually past due 90 days or more. We continue to accrue contractual interest on loans that are fully secured by deposits or on which there are financial guarantees from the Korean government, the KDIC or certain financial institutions.

The following table shows, as of the dates indicated, the amount of loans that were problem loans and accruing loans which were past due 90 days or more:

	As of December 31,
	2013(1)						2014						2015						2016						2017
	Domestic		Foreign		Total		Domestic		Foreign		Total		Domestic		Foreign		Total		Domestic		Foreign		Total		Domestic		Foreign		Total
Loans classified as problem loans(2)
Corporate(3)	￦	3,645	￦	23	￦	3,668	￦	2,458	￦	82	￦	2,540	￦	1,901	￦	44	￦	1,945	￦	1,200	￦	67	￦	1,267	￦	924	￦	145	￦	1,069
Consumer(4)		600		—		600		547		6		553		436		4		440		442		20		462		460		23		483
Sub-total		4,245		23		4,268		3,005		88		3,093		2,337		48		2,385		1,642		87		1,729		1,384		168		1,551
Accruing loans which are contractually past due 90 days or more as to principal or interest(2)
Corporate(3)		—		—		—		2		—		2		—		—		—		3		—		3		2		—		2
Consumer(4)		—		—		—		—		—		—		—		—		—		—		—		—		—		—		—
Sub-total		—		—		—		2		—		2		—		—		—		3		—		3		2		—		2
Total	￦	4,245	￦	23	￦	4,268	￦	3,007	￦	88	￦	3,095	￦	2,337	￦	48	￦	2,385	￦	1,645	￦	87	￦	1,732	￦	1,386	￦	168	￦	1,553

⁽¹⁾  The amounts as of December 31, 2013 exclude certain former subsidiaries classified as a disposal group held for distribution or sale.

⁽²⁾  Not including due from banks and other receivables, and prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs.

⁽³⁾  Including loans made to banks and the Korean government and government-owned agencies.

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⁽⁴⁾  Includes credit card balances of ￦79 billion, ￦80 billion, ￦93 billion, ￦142 billion and ￦163 billion as of December 31, 2013, 2014, 2015, 2016 and 2017, respectively.

The following table shows, as of the dates indicated, the amount of problem loans, potential problem loans and non-performing loans:

	As of December 31,
	2015		2016		2017
	(in billions of Won)
Problem loans	￦	2,385	￦	1,729	￦	1,551
Potential problem loans(1)		1,603		1,158		937
Non-performing loans		2,909		2,080		1,853

⁽¹⁾  Potential problem loans are those classified as precautionary that we determine, through our internal loan review process, as requiring close management due to the borrower’s financial condition, our forecast for the industry in which it operates or as a result of other developments relating to its business.

Loan Aging Schedule

The following table shows our loan aging schedule (excluding accrued interest) as of the dates indicated. In line with industry practice, we have restructured a portion of our delinquent credit card balances as loans.

	As of December 31, 2017
	Normal					Past due by 1 month or less					Past due by 1-3 months					Past due by 3-6 months					Past due by more than 6 months					Total
	(in billions of Won, except percentages)
	Amount		%			Amount past due		%			Amount past due		%			Amount past due		%			Amount past due		%			Amount		%
Domestic
Corporate(1)
Commercial and industrial	￦	92,767		36.7	%	￦	172		0.1	%	￦	81		0.0	%	￦	98		0.0	%	￦	202		0.1	%	￦	93,320		36.9	%
Lease financing		25		0.0			—		0.0			—		0.0			—		0.0			—		0.0			25		0.0
Trade financing		9,264		3.7			8		0.0			4		0.0			3		0.0			11		0.0			9,290		3.7
Other commercial		21,238		8.4			5		0.0			5		0.0			1		0.0			34		0.0			21,283		8.4
Total corporate		123,294		48.8			185		0.0			90		0.0			102		0.0			247		0.1			123,918		49.0
Consumer
General purpose household		34,084		13.5			165		0.1			41		0.0			30		0.0			54		0.0			34,374		13.6
Mortgages		47,104		18.7			277		0.1			46		0.0			23		0.0			26		0.0			47,476		18.8
Home equity		25,308		10.1			116		0.0			27		0.0			21		0.0			41		0.0			25,513		10.1
Total consumer		106,496		42.3			558		0.2			114		0.0			74		0.0			121		0.0			107,363		42.5
Credit cards		6,617		2.7			122		0.0			49		0.0			39		0.0			—		0.0			6,827		2.7
Total domestic		236,407		93.8			865		0.3			253		0.0			215		0.0			368		0.1			238,108		94.2
Foreign
Corporate(2)
Commercial and industrial		9,579		3.8			1		0.0			1		0.0			8		0.0			43		0.0			9,632		3.8
Trade financing		2,649		1.0			4		0.0			0		0.0			0		0.0			2		0.0			2,655		1.0
Other commercial		471		0.2			0		0.0			0		0.0			0		0.0			0		0.0			471		0.2
Total corporate		12,699		5.0			5		0.0			1		0.0			8		0.0			45		0.0			12,758		5.0
Consumer		1,864		0.8			2		0.0			3		0.0			1		0.0			57		0.0			1,927		0.8
Total foreign		14,563		5.8			7		0.0			4		0.0			9		0.0			102		0.0			14,685		5.8
Total loans(3)	￦	250,970		99.6	%	￦	872		0.3	%	￦	257		0.0	%	￦	224		0.0	%	￦	470		0.1	%	￦	252,793		100.0	%

⁽¹⁾  Including loans made to banks and the Korean government and government-owned agencies.

⁽²⁾  Including loans made to banks.

⁽³⁾  Not including due from banks and other receivables, and prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs.

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	As of December 31, 2016
	Normal					Past due by 1 month or less					Past due by 1-3 months					Past due by 3-6 months					Past due by more than 6 months					Total
	(in billions of Won, except percentages)
	Amount		%			Amount past due		%			Amount past due		%			Amount past due		%			Amount past due		%			Amount		%
Domestic
Corporate(1)
Commercial and industrial	￦	88,313		37.4	%	￦	162		0.1	%	￦	98		0.0	%	￦	97		0.0	%	￦	298		0.2	%	￦	88,968		37.7	%
Lease financing		7		0.0			—		0.0			—		0.0			—		0.0			—		0.0			7		0.0
Trade financing		10,671		4.5			4		0.0			4		0.0			10		0.0			10		0.0			10,699		4.5
Other commercial		12,843		5.4			6		0.0			2		0.0			17		0.0			55		0.0			12,923		5.4
Total corporate		111,834		47.3			172		0.1			104		0.0			124		0.0			363		0.2			112,597		47.6
Consumer
General purpose household		30,412		12.9			141		0.1			30		0.0			21		0.0			80		0.0			30,684		13.0
Mortgages		47,328		20.1			225		0.1			38		0.0			18		0.0			21		0.0			47,630		20.2
Home equity		24,269		10.3			112		0.0			24		0.0			17		0.0			64		0.0			24,486		10.3
Total consumer		102,009		43.3			478		0.2			92		0.0			56		0.0			165		0.0			102,800		43.5
Credit cards		6,502		2.7			92		0.0			51		0.0			29		0.0			—		0.0			6,674		2.7
Total domestic		220,345		93.3			742		0.3			247		0.0			209		0.0			528		0.2			222,071		93.8
Foreign
Corporate(2)
Commercial and industrial		10,449		4.5			1		0.0			2		0.0			36		0.0			52		0.0			10,540		4.5
Trade financing		2,155		0.9			—		0.0			—		0.0			—		0.0			1		0.0			2,156		0.9
Other commercial		350		0.1			—		0.0			—		0.0			—		0.0			—		0.0			350		0.1
Total corporate		12,954		5.5			1		0.0			2		0.0			36		0.0			53		0.0			13,046		5.5
Consumer		1,664		0.7			2		0.0			6		0.0			2		0.0			10		0.0			1,684		0.7
Total foreign		14,618		6.2			3		0.0			8		0.0			38		0.0			63		0.0			14,730		6.2
Total loans(3)	￦	234,963		99.5	%	￦	745		0.3	%	￦	255		0.0	%	￦	247		0.0	%	￦	591		0.2	%	￦	236,801		100.0	%

⁽¹⁾  Including loans made to banks and the Korean government and government-owned agencies.

⁽²⁾  Including loans made to banks.

⁽³⁾  Not including due from banks and other receivables, and prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs.

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	As of December 31, 2015
	Normal					Past due by 1 month or less					Past due by 1-3 months					Past due by 3-6 months					Past due by more than 6 months					Total
	(in billions of Won, except percentages)
	Amount		%			Amount past due		%			Amount past due		%			Amount past due		%			Amount past due		%			Amount		%
Domestic
Corporate(1)
Commercial and industrial	￦	91,443		40.3	%	￦	158		0.1	%	￦	154		0.1	%	￦	534		0.2	%	￦	513		0.3	%	￦	92,802		41.0	%
Trade financing		11,405		5.0			8		0.0			10		0.0			9		0.0			14		0.0			11,446		5.0
Other commercial		12,135		5.3			7		0.0			7		0.0			18		0.0			62		0.0			12,229		5.3
Total corporate		114,983		50.6			173		0.1			171		0.1			561		0.2			589		0.3			116,477		51.3
Consumer
General purpose household		26,679		11.8			143		0.1			38		0.0			25		0.0			86		0.0			26,971		11.9
Mortgages		40,337		17.8			188		0.1			33		0.0			16		0.0			24		0.0			40,598		17.9
Home equity		24,391		10.7			130		0.1			35		0.0			23		0.0			78		0.0			24,657		10.8
Total consumer		91,407		40.3			461		0.3			106		0.0			64		0.0			188		0.0			92,226		40.6
Credit cards		5,899		2.6			103		0.0			50		0.0			47		0.0			—		0.0			6,099		2.6
Total domestic		212,289		93.5			737		0.4			327		0.1			672		0.2			777		0.3			214,802		94.5
Foreign
Corporate(2)
Commercial and industrial		9,484		4.3			7		0.0			3		0.0			5		0.0			19		0.0			9,518		4.3
Trade financing		1,419		0.6			—		0.0			—		0.0			1		0.0			1		0.0			1,421		0.6
Other commercial		192		0.1			—		0.0			—		0.0			—		0.0			14		0.0			206		0.1
Total corporate		11,095		5.0			7		0.0			3		0.0			6		0.0			34		0.0			11,145		5.0
Consumer		1,218		0.5			1		0.0			1		0.0			—		0.0			2		0.0			1,222		0.5
Total foreign		12,313		5.5			8		0.0			4		0.0			6		0.0			36		0.0			12,367		5.5
Total loans(3)	￦	224,602		99.0	%	￦	745		0.4	%	￦	331		0.1	%	￦	678		0.2	%	￦	813		0.3	%	￦	227,169		100.0	%

⁽¹⁾  Including loans made to banks and the Korean government and government-owned agencies.

⁽²⁾  Including loans made to banks.

⁽³⁾  Not including due from banks and other receivables, and prior to deducting allowance for credit losses and present value discount or reflecting deferred origination costs.

Credit Exposures to Companies in Workout, Restructuring or Rehabilitation

Workout is a voluntary procedure through which we, together with the borrower and other creditors, seek to restore the borrower’s financial stability and viability. Previously, workouts were regulated under a series of Corporate Restructuring Promotion Acts, which last expired on December 31, 2015. In March 2016, the National Assembly of Korea adopted a new Corporate Restructuring Promotion Act, which is scheduled to expire on June 30, 2018. Under the new Corporate Restructuring Promotion Act, creditors of a financially troubled borrower may participate in a creditors’ committee, which is authorized to prohibit such creditors from exercising their rights against the borrower, commence workout procedures and approve or make revisions to a reorganization plan prepared by the lead creditor bank, the borrower and external experts. The composition of the creditors’ committee is determined at the initial meeting of the committee by the approval of creditors holding not less than 75% of the borrower’s total outstanding debt held by creditors who were notified of the initial meeting of the committee. Although creditors that are not financial institutions or hold less than 1% of the total outstanding debt of the borrower need not be notified of the initial meeting of the creditors’ committee, if such creditors wish to participate, they may not be excluded. Any decision of the creditors’ committee requires the approval of creditors holding not less than 75% of the total outstanding debt of the borrower. However, if a single creditor holds 75% or more of the borrower’s total outstanding debt held by the creditors comprising the creditors’ committee, any decision of the creditors’ committee requires the approval of not less than 40% of the total number of creditors (including such single creditor) comprising the committee. An additional approval of creditors holding not less than 75% of the secured debt is required with respect to the borrower’s debt restructuring. Once approved, any decision made by the creditors’ committee is binding on all creditors of the borrower, with the exception of those creditors that were excluded by a resolution of the committee at its initial meeting and those who exercised their right to request that their claims be purchased. Creditors that voted against

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commencement of workout, approval or revision of the reorganization plan, debt restructuring, granting of new credit, extension of the joint management process or other resolutions of the committee have the right to request the creditors that voted in favor of such matters to purchase their claims at a mutually agreed price. In the event that the parties are not able to agree on the terms of purchase, a coordination committee consisting of experts would determine the terms. The creditors that oppose a decision made by the coordination committee may request a court to change such decision.

Korean law also provides for corporate rehabilitation proceedings, which are court-supervised procedures to rehabilitate an insolvent company. Under these procedures, a restructuring plan is adopted at a meeting of interested parties, including creditors of the company. That restructuring plan is subject to court approval.

A portion of our loans to and debt securities of corporate customers are currently in workout, restructuring or rehabilitation. As of December 31, 2017, ￦529 billion, or 0.2%, of our total loans and debt securities were in workout, restructuring or rehabilitation. This included ￦245 billion of loans to and debt securities of large corporate borrowers in workout, restructuring or rehabilitation and ￦273 billion of loans to and debt securities of small- and medium-sized enterprises in workout, restructuring or rehabilitation, which represented 0.1% and 0.1% of our total loans and debt securities, respectively. Our Corporate Restoration Department manages our workout, restructured and rehabilitated loans. Upon approval of a workout, restructuring or rehabilitation plan, a credit exposure is initially classified as precautionary or lower and thereafter cannot be classified higher than precautionary with limited exceptions. If a corporate borrower is in workout, restructuring or rehabilitation, we take the status of the borrower into account in assessing our loans to and collateral from that borrower for purposes of establishing our allowance for credit losses.

The following table shows, as of December 31, 2017, our 10 largest exposures that were in workout, restructuring or rehabilitation:

	Loans														Amounts Classified as Substandard or Below(2)		Allowance for Credit Loss
Company	Won Currency		Foreign Currency		Equity Securities		Debt Securities		Guarantees and Acceptances		Total Exposures		Collateral(1)
	(in billions of Won)
Orient Shipyard	￦	—	￦	—	￦	—	￦	—	￦	76	￦	76	￦	—	￦	76	￦	18
Posco Plantec		68		—		—		—		—		68		20		68		49
Dongmoon Construction		49		—		—		—		—		49		20		28		9
STX Heavy Industries		19		—		—		—		19		38		25		13		13
DB Metal		—		22		—		—		8		30		—		30		19
Chuncheon Golf Academy		21		—		—		—		—		21		18		21		1
Dongbu Steel		—		13		4		—		1		18		—		1		1
NTS		17		—		—		—		—		17		11		17		2
Samhongsa		16		—		—		—		—		16		9		—		1
Korea Development		15		—		—		—		—		15		—		15		10
Total	￦	205	￦	35	￦	4	￦	—	￦	104	￦	348	￦	103	￦	269	￦	123

⁽¹⁾  The value of collateral is appraised based on future cash flow and observable market price.

⁽²⁾  Classification is based on the Financial Services Commission’s asset classification criteria.

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Potential Problem Loans

As of December 31, 2017, we had ￦937 billion of corporate loans in respect of which we had serious doubt as to the borrower’s ability to comply with repayment terms in the near future. Potential problem loans are those classified as precautionary that we determine, through our internal loan review process, as requiring close management due to the borrower’s financial condition, our forecast for the industry in which it operates or as a result of other developments relating to its business. The following table shows changes in our potential problem loans between December 31, 2016 and 2017:

	Amount
	(in billions of Won)
Balance of potential problem loans at December 31, 2016	￦	1,158
Increase in the balance of potential problem loans to borrowers who became newly classified as borrowers with potential problem loans in 2017		404
Decrease in the balance of potential problem loans to borrowers to whom we had potential problem loans outstanding at December 31, 2016 and have non-performing loans outstanding at December 31, 2017		(41	)
Decrease in the balance of potential problem loans to borrowers to whom we had potential problem loans outstanding at December 31, 2016 but no longer have any loans outstanding at December 31, 2017		(515	)
Decrease in the balance of potential problem loans to borrowers to whom we had potential problem loans outstanding at December 31, 2016 but have loans outstanding classified as normal at December 31, 2017		(74	)
Net other decrease in the balance of potential problem loans to existing borrowers to whom we had potential problems loans outstanding at December 31, 2017		5
Balance at December 31, 2017	￦	937

Non-Performing Loans

Non-performing loans include commercial and consumer loans which are past due by 90 days or more. In addition, non-performing loans include those loans that, even if they are not past due, are classified as “substandard,” “doubtful” or “estimated loss” based on the Financial Services Commission’s asset classification criteria. Moreover, when a consumer loan borrower has any loans that are classified as “substandard,” “doubtful” or “estimated loss” under such criteria, all loans to such borrower are classified as non-performing loans. See “—Loan Classifications” above. The following table shows, as of the dates indicated, certain details of our total non-performing loan portfolio:

	As of December 31,
	2013(1)			2014			2015			2016			2017
	(in billions of Won, except percentages)
Total non-performing loans	￦	4,996	(2)	￦	3,818	(3)	￦	2,909	(4)	￦	2,080	(5)	￦	1,853	(6)
As a percentage of total loans		2.58	%		1.84	%		1.28	%		0.88	%		0.73	%

⁽¹⁾  The amounts as of December 31, 2013 exclude certain former subsidiaries classified as a disposal group held for distribution or sale.

⁽²⁾  Excludes ￦62 billion of previously delinquent credit card balances restructured into loans that were classified as normal or precautionary.

⁽³⁾  Excludes ￦65 billion of previously delinquent credit card balances restructured into loans that were classified as normal or precautionary.

⁽⁴⁾  Excludes ￦73 billion of previously delinquent credit card balances restructured into loans that were classified as normal or precautionary.

⁽⁵⁾  Excludes ￦102 billion of previously delinquent credit card balances restructured into loans that were classified as normal or precautionary.

⁽⁶⁾  Excludes ￦122 billion of previously delinquent credit card balances restructured into loans that were classified as normal or precautionary.

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The above amounts do not include loans classified as substandard or below that we sold to United Asset Management Corp., or UAMCO, or to certain structured companies. See “—Sales of Non-Performing Loans.”

We have also issued securities backed by non-performing loans and other assets. Some of these transactions involved transfers of loans through securitizations where control of the loans has not been surrendered and, therefore, are not treated as sale transactions. Instead, the assets remain on our balance sheet with the securitization proceeds treated as part of borrowings. These assets are included in the table above.

The following table sets forth, as of the dates indicated, our total non-performing loans by type of loan:

	As of December 31,
	2013(1)					2014					2015					2016					2017
	Amount		%			Amount		%			Amount		%			Amount		%			Amount		%
	(in billions of Won, except percentages)
Domestic
Corporate
Commercial and industrial	￦	3,783		75.7	%		￦2,751		72.1	%	￦	2,098		72.1	%	￦	1,222		58.8	%	￦	1,051		56.6	%
Lease financing		—		—			—		—			—		—			—		—			—		0.0
Trade financing		343		6.9			160		4.2			199		6.9			259		12.4			288		15.6
Other commercial		313		6.3			300		7.9			142		4.9			151		7.3			98		5.3
Total corporate		4,439		88.9			3,211		84.2			2,439		83.9			1,632		78.5			1,437		77.5
Consumer
General purpose household(2)		418		8.4			426		11.1			283		9.7			227		10.9			187		10.1
Mortgage		33		0.6			45		1.2			46		1.6			60		2.9			73		3.9
Total consumer		451		9.0			471		12.3			329		11.3			287		13.8			260		14.0
Credit cards		56		1.1			65		1.7			68		2.3			51		2.4			57		3.1
Total domestic		4,946		99.0			3,747		98.2			2,836		97.5			1,970		94.7			1,754		94.6
Foreign
Corporate
Commercial and industrial		47		0.9			51		1.3			41		1.4			91		4.4			74		4.0
Lease financing		—		—			—		—			—		—			—		0.0			—		0.0
Trade financing		—		—			3		0.1			2		0.1			1		0.0			2		0.1
Other commercial		—		—			—		—			14		0.5			—		0.0			7		0.4
Total corporate		47		0.9			54		1.4			57		2.0			92		4.4			83		4.5
Consumer		3		0.1			17		0.4			16		0.5			18		0.9			16		0.9
Total foreign		50		1.0			71		1.8			73		2.5			110		5.3			99		5.4
Total non- performing loans	￦	4,996		100.0	%		￦3,818		100.0	%	￦	2,909		100.0	%	￦	2,080		100.0	%	￦	1,853		100.0	%

⁽¹⁾  The amounts as of December 31, 2013 exclude certain former subsidiaries classified as a disposal group held for distribution or sale.

⁽²⁾  Includes home equity loans.

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The following table presents an analysis of the changes in our non-performing loans for 2017:

	2017
	(in billions of Won)
Non-performing loans as of January 1, 2017	￦	2,080
Additions to non-performing loans
Loans transferred into non-performing loans		1,443
Reductions in non-performing loans
Loans sold		(319	)
Loans modified and returned to performing loans		(189	)
Loans paid down or paid off		(350	)
Loans charged-off		(812	)
Other		—
Total net reductions to non-performing loans		(227	)
Total non-performing loans as of December 31, 2017	￦	1,853

Top 20 Non-Performing Loans.  As of December 31, 2017, our 20 largest non-performing loans accounted for 53.2% of our total non-performing loan portfolio. The following table shows, as of that date, certain information regarding those loans:

	Gross principal outstanding		Allowance for credit losses		Collateral(1)		Industry
	(in billions of Won)
Borrower A	￦	170	￦	157	￦	45	Manufacturing
Borrower B		166		139		—	Manufacturing
Borrower C		78		65		—	Manufacturing
Borrower D		72		12		68	Shipbuilding
Borrower E		71		40		—	Real estate
Borrower F		68		49		20	Manufacturing
Borrower G		53		38		—	Retail and wholesale
Borrower H		33		30		—	Manufacturing
Borrower I		32		30		—	Shipping
Borrower J		31		18		—	Shipbuilding
Borrower K		28		9		20	Construction
Borrower L		28		3		24	Real estate
Borrower M		27		16		—	Manufacturing
Borrower N		22		19		—	Manufacturing
Borrower O		21		1		18	Real estate
Borrower P		19		18		—	Manufacturing
Borrower Q		17		2		—	Real estate
Borrower R		17		2		11	Manufacturing
Borrower S		17		14		17	Manufacturing
Borrower T		16		15		—	Manufacturing
Total	￦	986	￦	677	￦	223

⁽¹⁾  The value of collateral is appraised based on future cash flow and observable market price.

Non-Performing Loans and Impaired Loans

The term “non-performing loan” is used for our asset quality management in accordance with the Banking Industry Supervision Regulations of Korea, whereas the term “impaired loan” is used for financial reporting purposes based on our internal accounting policies in accordance with International Accounting Standard 39.

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Major differences between non-performing loans and impaired loans are as follows:

Item	Non-performing loans	Impaired loans
Relevant regulation or accounting principle	Banking Industry Supervision Regulations of Korea (loans classified as “substandard,” “doubtful” or “estimated loss”)	Our internal policy based on IAS 39
Scope	Loans	Loans and receivables (including due from banks and other receivables)
Purchased impaired loans	Not included	Included
Loans classified as “precautionary” based on the Financial Services Commission’s asset classification criteria	Not included	Loans classified as “precautionary,” for which the borrower has a capital deficit or its auditor’s opinion on its financial statements is modified or qualified, are included

The following table shows, as of the dates indicated, the amounts of impaired loans and non-performing loans:

	As of December 31,
	2015		2016		2017
	(in billions of Won)
Impaired loans	￦	3,677	￦	2,554	￦	2,237
Precautionary loans meeting the definition of impaired loans(1)		81		142		51
Others		3,596		2,412		2,186
Non-performing loans		2,909		2,080		1,853

⁽¹⁾  Includes loans that are individually significant where the borrower has a capital deficit or its external auditor has expressed a qualified opinion or disclaimed its opinion on the borrower’s financial statements.

Non-Performing Loan Strategy

One of our goals is to improve our asset quality, in part by reducing our non-performing loans. We have standardized our credit risk management systems to reduce our risks relating to future non-performing loans. Our credit rating systems are designed to prevent the extension of new loans to high-risk borrowers as determined by their credit rating. Our credit monitoring systems are designed to bring any sudden increase in a borrower’s credit risk to our attention to enable close monitoring of such loans. See “Item 11. Quantitative and Qualitative Disclosures about Market Risk—Credit Risk Management.”

Our Credit Management and Collection Department and the Corporate Restoration Department generally oversee the process for resolving non-performing loans transferred to them by other business groups. We believe that by centralizing the management of our non-performing loans, we can become more effective in dealing with the issues relating to these loans by pooling institutional knowledge and creating a more specialized workforce.

When a loan becomes non-performing, we will begin a due diligence review of the borrower’s assets, send a notice demanding payment or stating that we will take legal action, and prepare for legal action. At the same time, we initiate our non-performing loan management process, which begins with:

• identifying loans subject to a proposed sale by assessing the estimated losses from such sale based on the estimated recovery value of collateral, if any, for such non-performing loans;

• identifying loans subject to charge-off based on the estimated recovery value of collateral, if any, for such non-performing loans and the estimated rate of recovery of unsecured loans; and

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• on a limited basis, identifying corporate loans subject to normalization efforts based on the cash-flow situation of the borrower.

Once we have confirmed the details of a non-performing loan, we make efforts to recover amounts owed to us. Methods for resolving non-performing loans include the following:

• commencing collection proceedings;

• commencing legal actions to seize collateral;

• writing off these amounts, transferring them to specific subsidiaries in charge of collections and authorizing those subsidiaries to recover what they can with respect to these amounts or to sell these loans to third parties; and

• with respect to large corporations, commencing or participating in voluntary workouts or restructurings mandated by Korean courts.

In addition to making efforts to collect on our non-performing loans, we also undertake measures to reduce the overall level of our non-performing loans. These measures include:

• selling our non-performing loans to structured companies established in connection with our joint ventures with several financial institutions; and

• selling our non-performing loans to third parties, including UAMCO.

See “—Sales of Non-Performing Loans.” We generally expect to suffer a partial loss on loans that we sell or securitize, to the extent such sales and securitizations are recognized as such under IFRS.

Foreclosure and Collateral.  We generally foreclose on mortgages or exercise our security interests in respect of other collateral if a collateralized obligation becomes overdue for more than three months. At that time, we will petition a court to foreclose on collateral and to sell that collateral through a court-supervised auction. Under Korean law, that petition must be filed with a court that has jurisdiction over the mortgaged property, and must be filed together with a copy of the mortgage agreement and an extract of the court registry regarding the subject property. The court will then issue an order to commence the foreclosure auction, which will be registered in the court registry of the subject property. If no bidder bids at least the minimum amount set by the court on the first auction date, the court will set another date for a subsequent auction approximately one month later. Each time a new auction date is set, the minimum auction price will be lowered by approximately 20%. Unlike laws relating to foreclosure in the United States, Korean law does not provide for non-judicial foreclosure. During 2015, 2016 and 2017, we foreclosed on collateral we obtained with respect to loan balances representing approximately 0.3%, 0.2% and 0.1% respectively, of our average interest-bearing loan balances in each of those periods.

Korean financial institutions, including us, maintain general policies to assess a potential customer’s eligibility for loans based on that entity’s credit quality, rather than requiring a particular level of collateral, especially in the case of large corporate borrowers. As a result, the ratio of our collateral to non-performing corporate loans is relatively low when compared with our total exposures. For secured consumer loans, however, we generally impose limits on loan amounts based on the collateral we receive. See “—Consumer Banking—Lending Activities.”

We reflect this collateral level when we estimate the future cash flow for our loans, which we calculate using a discounted cash flow method. With respect to loans to borrowers that we do not believe will be going concerns in the future, the lower collateral ratio has a direct effect on cash flow estimates and results in a higher level of allowances. With respect to loans to borrowers that we expect to be going concerns, the lower collateral ratio has an effect on cash flow estimates but we also consider other factors, including future operating income and future asset disposals and restructuring, in determining allowance levels. Accordingly, for these latter borrowers, the effect of lower collateral levels on allowances is mitigated by other characteristics of the borrower, and that lower collateral level will not necessarily result in a higher level of allowances.

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Sales of Non-Performing Loans

The overall asset quality of our loan portfolio is affected by sales of non-performing loans. These sales have been made primarily to UAMCO and various structured companies as further described below.

The following table sets forth information regarding our sales of loans for the periods indicated:

	Year Ended December 31,
	2015							2016						2017
Purchaser	Net Carrying Amount(1)		Sale Price		Gain (Loss)			Net Carrying Amount(1)		Sale Price		Gain (Loss)		Net Carrying Amount(1)		Sale Price		Gain (Loss)
	(in billions of Won)
Structured companies	￦	162	￦	193	￦	31		￦	213	￦	244	￦	31	￦	260	￦	273	￦	13
UAMCO		247		303		56			66		78		12		—		—		—
Others		167		140		(27	)		218		259		41		—		—		—
Total	￦	576	￦	636	￦	60		￦	497	￦	581	￦	84	￦	260	￦	273	￦	13

⁽¹⁾  Net carrying amount represents the net value of non-performing loans after deduction of allowance for credit losses on such basis.

United Asset Management Corp.  UAMCO was established in late 2009 in the wake of the global financial crisis by six major commercial banks in Korea, including us, to purchase, sell and securitize non-performing loans and to engage in corporate restructuring activities, among other things. Currently, we and six other banks each hold a 14% equity interest in UAMCO, while one other bank holds a 2% equity interest. We have committed to contribute approximately ￦177 billion of capital to UAMCO, of which approximately ￦87 billion has been contributed to date. Upon the fulfillment of such capital contribution commitments from us and the seven other banks, UAMCO may request a loan from the seven banks holding a 14% equity interest in UAMCO, which includes us, of up to a combined ￦2 trillion, upon which such seven banks must use their best efforts to fulfill such request pro rata to their ownership interests. Therefore, we have neither control nor significant influence over UAMCO.

Pursuant to a memorandum of understanding among the Financial Services Commission and seven banks, including us, a private equity fund was established in June 2011 to acquire approximately ￦1.2 trillion of non-performing bank loans to construction companies in workout, restructuring or rehabilitation. The general partner of the fund is UAMCO and the limited partners consist of the seven banks and other investors. The fund purchases non-performing bank loans at market price and the funds required to purchase such loans are contributed or lent by the same banks that sell such loans to the fund. In June 2011, we agreed to make a capital commitment of ￦148 billion and provide a ￦109 billion revolving loan facility to the fund. From June to December 2011, we contributed the entire amount of our capital commitment to the fund in connection with its purchase of ￦443 billion of non-performing loans from us. In 2012, we made an additional capital contribution of ￦44 billion to the fund in connection with its purchase of ￦44 billion of non-performing loans from us. We have determined that we have significant influence over the private equity fund.

Under the terms of our sale of loans to UAMCO and the private equity fund, we are not required to repurchase any such loans, provide post-sale price adjustments or otherwise continue to be involved with such loans subsequent to their sale in any material respect. In addition, UAMCO and the private equity fund have the practical ability to sell non-performing loans in their entirety to unrelated third parties and are able to exercise such ability unilaterally without the need to impose additional restrictions, notwithstanding our ownership interest. Therefore, we believe we have not retained control over the transferred assets, and non-performing loans sold to UAMCO in 2015, 2016 and 2017 were derecognized in accordance with International Accounting Standard 39.

Structured companies.  We transfer non-performing loans to structured companies, of which we do not have control over the significant operations. Most of the structured companies are investment funds that specialize in acquiring non-performing loans from Korean financial institutions, including us. In addition, we have not provided any financial guarantees or credit facilities nor invested in any such investment funds. As such, we

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believe that we have transferred substantially all of the risks and rewards of the relevant non-performing loans to the structured companies and have derecognized all non-performing loans that were transferred to structured companies in 2015, 2016 and 2017.

Others.  In addition to sales of loans to UAMCO and various structured companies, we sell non-performing loans to various private investment companies. Pursuant to the terms of such sales to private investment companies, we are not required to repurchase any such loans, provide post-sale price adjustments or otherwise continue to be involved with such loans subsequent to their sale in any material respect.

Allocation and Analysis of Allowances for Credit Losses

The following table presents, as of the dates indicated, the allocation of our allowances for credit losses by loan type:

	As of December 31,
	2013(1)				2014				2015				2016				2017
	(in billions of Won, except percentages)
Domestic
Corporate
Commercial and industrial	￦	2,336	69.9	%	￦	1,781	68.3	%	￦	1,297	63.2	%	￦	975	52.7	%	￦	893	50.4	%
Lease financing		—	—			—	—			—	—			—	—			1	0.1
Trade financing		313	9.4			151	5.8			217	10.6			277	14.9			297	16.8
Other commercial		229	6.9			157	6.0			135	6.6			183	9.8			143	8.0
Total corporate		2,878	86.2			2,089	80.1			1,649	80.4			1,435	77.4			1,334	75.3
Consumer
General purpose household(2)		284	8.5			301	11.5			184	9.0			149	8.0			187	10.6
Mortgage		15	0.4			19	0.7			11	0.5			9	0.5			11	0.6
Total consumer		299	8.9			320	12.2			195	9.5			158	8.5			198	11.2
Credit cards		106	3.2			129	4.9			146	7.1			155	8.4			182	10.3
Total domestic		3,283	98.3			2,538	97.2			1,990	97.0			1,748	94.3			1,714	96.8
Foreign
Corporate
Commercial and industrial		53	1.7			56	2.2			44	2.2			92	5.0			39	2.2
Trade financing		1	—			4	0.2			4	0.2			1	0.1			3	0.2
Other commercial		—	—			—	—			3	0.1			1	0.1			7	0.4
Total corporate		54	1.7			60	2.4			51	2.5			94	5.2			49	2.8
Consumer		—	—			11	0.4			10	0.5			9	0.5			7	0.4
Total foreign		54	1.7			71	2.8			61	3.0			103	5.7			56	3.2
Total allowance for credit losses(3)	￦	3,337	100.0	%	￦	2,609	100.0	%	￦	2,051	100.0	%	￦	1,851	100.0	%	￦	1,770	100.0	%

⁽¹⁾  The amounts as of December 31, 2013 exclude certain former subsidiaries classified as a disposal group held for distribution or sale.

⁽²⁾  Includes home equity loans.

⁽³⁾  Not including due from banks and other receivables

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The following table presents an analysis of the changes in our allowances for credit losses for each of the years indicated:

	Year ended December 31,
	2013(1)			2014			2015			2016			2017
	(in billions of Won)
Balance at the beginning of the period	￦	3,565		￦	3,337		￦	2,609		￦	2,051		￦	1,851
Bad debt expenses for the period		2,557			1,076			1,029			822			896
Increase on repurchases of non-performing loans		—			—			—			—			—
Gross charge-offs
Domestic
Corporate
Commercial and industrial		(1,462	)		(1,037	)		(1,016	)		(613	)		(352	)
Lease financing		—			—			—			—			—
Trade financing		(108	)		(62	)		(82	)		(67	)		(29	)
Other commercial		(47	)		(68	)		(30	)		(19	)		(39	)
Total corporate		(1,617	)		(1,167	)		(1,128	)		(699	)		(420	)
Consumer
General purpose household(2)		(179	)		(113	)		(237	)		(152	)		(143	)
Mortgage		(1	)		(2	)		(3	)		(3	)		(4	)
Total consumer		(180	)		(115	)		(240	)		(155	)		(147	)
Credit cards		(172	)		(163	)		(198	)		(242	)		(228	)
Total domestic		(1,969	)		(1,445	)		(1,566	)		(1,096	)		(795	)
Foreign		(8	)		(7	)		(11	)		(23	)		(37	)
Allowances relating to loans sold		(161	)		(150	)		(141	)		(115	)		(66	)
Total gross charge-offs		(2,138	)		(1,602	)		(1,718	)		(1,234	)		(898	)
Recoveries:
Domestic
Corporate
Commercial and industrial		140			53			158			153			65
Lease financing		—			—			—			—			—
Trade financing		14			6			19			18			6
Other commercial		13			6			20			21			14
Total corporate		167			65			197			192			85
Consumer
General purpose household(1)		34			6			16			29			25
Mortgage		8			3			13			25			20
Total consumer		42			9			29			54			45
Credit cards		26			28			34			44			51
Total domestic		235			102			260			290			181
Foreign		1			1			1			—			1
Total recoveries		236			103			261			290			182
Net charge-offs		(1,902	)		(1,499	)		(1,457	)		(944	)		(716	)
Foreign exchange translation effects		(1	)		1			—			1			(3	)
Others(3)		(225	)		(306	)		(130	)		(79	)		(258	)
Adjustment from discontinued operations		(657	)		—			—			—			—
Balance at the end of the period	￦	3,337		￦	2,609		￦	2,051		￦	1,851		￦	1,770
Ratio of net charge-offs during the period to average loans outstanding during the period		1.0	%		0.8	%		0.7	%		0.4	%		0.3	%

⁽¹⁾  Includes discontinued operations.

⁽²⁾  Includes home equity loans.

⁽³⁾  Includes unwinding of discount.

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Loan Charge-Offs

The credit approval process we have implemented includes assessing credit risk before extending loans and monitoring outstanding loans, in order to minimize loans that must be charged off. To the extent charge-offs are required, we follow charge-off policies aimed at maximizing accounting transparency, minimizing any waste of resources in managing loans which have a low probability of being collected and reducing our non-performing loan ratio.

Loans To Be Charged Off.  We charge off loans that are deemed to be uncollectible by virtue of their falling under any of the following categories:

• loans for which collection is not foreseeable due to insolvency, bankruptcy, compulsory execution, disorganization, dissolution or the shutting down of the business of the debtor;

• loans for which collection is not foreseeable due to the death or disappearance of the debtor;

• loans for which expenses of collection exceed the collectable amount;

• loans on which collection is not possible through legal or any other means;

• payments in arrears in respect of credit cards that have been overdue for more than four payment cycles and have been classified as estimated loss (excluding instances where there has been partial payment of the overdue balance, where a related balance is not overdue or where a charge off is not possible due to Korean regulations), and those that have been overdue for more than six months;

• payments outstanding on corporate and consumer loans (other than credit card receivables) that have been overdue for more than 12 months, and those on unsecured consumer loans that have been overdue for more than six months; or

• the portion of loans classified as estimated loss, net of any recovery from collateral, which is deemed to be uncollectible.

Procedure for Charge-off Approval.  In order to charge off corporate loans, an application for a charge-off must be submitted by a branch to the Credit Management and Collection Department promptly and, in any event, within one month after the corporate loan is classified as estimated loss. The department evaluates and approves the application. Then, we must seek an approval from the Financial Supervisory Service for our charge-offs, which is typically granted. At the same time, we refer the approval of the charge-off by the Credit Management and Collection Department to our Audit Committee for its review to ensure compliance with our internal procedures for charge-offs, which include consultations with the branch submitting the charge-off application. Once we receive approval from the Financial Supervisory Service, we must also obtain approval from our senior management to charge off those loans.

With respect to unsecured consumer loans and credit card balances, we follow a different process to determine which unsecured consumer loans and credit card balances should be charged-off, based on the length of time those loans or balances are past due. We charge off unsecured consumer loans which are 12 months overdue and credit card balances which have been overdue for more than four payment cycles and have been classified as estimated loss (excluding instances where there has been partial payment of the overdue balance, where a related balance is not overdue or where a charge off is not possible due to Korean regulations).

Treatment of Loans Charged Off.  Once loans are charged off, we classify them as charged-off loans. These loans are then transferred to a wholly-owned subsidiary, Woori Credit Information, that is in charge of collections. It will attempt to recover amounts owed or to sell these loans to third parties.

In the case of collateralized loans, our general policy is to petition a court to foreclose and sell the collateral through a court-supervised auction if a collateralized loan becomes overdue for more than three months. If a debtor still fails to repay and the court grants its approval for foreclosure, we will sell the collateral, net of expenses incurred from the auction.

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Credit Rehabilitation Programs for Delinquent Consumer Borrowers

In light of the rapid increase in delinquencies in credit card and other consumer credit in recent years, and concerns regarding potential social issues posed by the growing number of individuals with bad credit, the Korean government has implemented a number of measures intended to support the rehabilitation of the credit of delinquent consumer borrowers. These measures may affect the amount and timing of our collections and recoveries on our delinquent consumer credits.

In 2002, the Financial Services Commission established the Credit Counseling and Recovery Service based upon an agreement among approximately 160 financial institutions in Korea. Upon application to the Credit Counseling and Recovery Service and approval by creditor financial institutions representing a majority of the outstanding unsecured debt and two-thirds of the outstanding secured debt, a qualified “credit delinquent person” with outstanding debts to two or more financial institutions in an aggregate amount not exceeding ￦500 million may participate in an individual work-out program designed to restructure such person’s debt and rehabilitate such person’s credit. The aggregate amount of our loans which became subject to such individual work-out programs in 2017 was ￦55 billion. In 2017, we recovered approximately ￦5 billion with respect to our loans subject to such individual work-out programs.

Under the Korean Debtor Recovery and Bankruptcy Law, a qualified individual debtor with outstanding debts in an aggregate amount not exceeding threshold amounts of ￦500 million of unsecured debt and/or ￦1 billion of secured debt may restructure his or her debts through a court-supervised debt restructuring that is binding on creditors. The aggregate amount of our loans which became subject to such court-supervised debt restructuring in 2017 was ￦263 billion. In 2017, we recovered ￦28 billion with respect to our loans subject to such court-supervised debt restructuring.

In September 2008, to support consumer borrowers with low credit scores, the Financial Services Commission established the Credit Rehabilitation Fund to purchase from creditors the loans of such borrowers that are in default and to provide guarantees so that such loans may be refinanced at lower rates. The Credit Rehabilitation Fund provides support to (i) individuals with low credit scores who are in default on loans not exceeding ￦50 million in principal amount in the aggregate (which requirement will be waived for individuals who are “basic living welfare recipients”) for a period of three months or more and (ii) individuals with low credit scores ranging from category 6 to 10 who are in default on loans not exceeding ￦30 million in principal amount in the aggregate (which requirement will be waived for individuals who are basic living welfare recipients) and the interest rate of which is 30% or more.

In March 2009, the Financial Services Commission requested Korean banks, including us, to establish a “pre-workout program,” including a credit counseling and recovery service, for retail borrowers with outstanding short-term debt. Under the pre-workout program, maturity extensions and/or interest rate adjustments are provided to retail borrowers with total loans of less than ￦1.5 billion (consisting of no more than ￦500 million of unsecured loans and ￦1 billion of secured loans) who are in arrears on their payments for more than 30 days but less than 90 days. The aggregate amount of consumer credit (including credit card receivables) we provided which became subject to the pre-workout program in 2017 was ￦32 billion. See “Item 3.D. Risk Factors—Risks relating to our consumer credit portfolio—We may experience increases in delinquencies in our consumer loan and credit card portfolios.”

Securities Investment Portfolio

Investment Policy

We invest in and trade Won-denominated securities and, to a lesser extent, foreign currency-denominated securities for our own account to:

• maintain asset stability and diversification;

• maintain adequate sources of back-up liquidity to match funding requirements; and

• supplement income from core lending activities.

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In making securities investments, we take into account a number of factors, including external broker analyses and internal assessments of macroeconomic trends, industry analysis, credit evaluation, maturity and trading history in determining whether to make a particular investment.

Our investments in debt securities include primarily bonds issued by government-related entities, as well as corporate bonds that have been guaranteed by banks (other than merchant banks), government-related funds or privately capitalized funds that we consider to have a low credit risk.

Our securities investments are subject to various regulations, including limitations prescribed under the Bank Act. Under these regulations, we must limit our investments in equity securities and bonds with a maturity in excess of three years (other than monetary stabilization bonds issued by the Bank of Korea and Korean government bonds) to 100% of the sum of our total Tier I and Tier II capital amount (less any capital deductions). We are also generally prohibited from acquiring more than 15% of the shares with voting rights issued by any other corporation. We and our trust accounts are prohibited from acquiring the shares of any of our “major shareholders,” as defined in “—Supervision and Regulation—Principal Regulations Applicable to Banks—Financial Exposure to Any Individual Customer or Major Shareholder,” in excess of an amount determined by the Enforcement Decree of the Bank Act within a maximum limit of 1% of the sum of our Tier I and Tier II capital (less any capital deductions). Further information on the regulatory environment governing our investment activities is set out in “—Supervision and Regulation—Principal Regulations Applicable to Banks—Liquidity” and “—Restrictions on Shareholdings in Other Companies.”

Our investments in foreign currencies are subject to certain limits and restrictions specified in our internal guidelines relating to country exposure, a single issuer and type of security exposure, and total investments by individual business groups.

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Book Value and Fair Value

The following table sets out the book value and fair value of securities in our portfolio as of the dates indicated:

	As of December 31,
	2015				2016				2017
	Book Value		Fair Value		Book Value		Fair Value		Book Value		Fair Value
	(in billions of Won)
Financial assets at fair value through profit and loss
Financial assets held for trading
Equity securities	￦	63	￦	63	￦	36	￦	36	￦	22	￦	22
Beneficiary certificates		14		14		24		24		13		13
Others		10		10		4		4		—		—
Debt securities
Korean treasury and government agencies		798		798		519		519		540		540
Financial institutions		1,175		1,175		1,445		1,445		1,477		1,477
Corporate		644		644		681		681		627		627
Total—Financial assets held for trading	￦	2,704	￦	2,704	￦	2,709	￦	2,709	￦	2,679	￦	2,679
Financial assets designated at FVTPL
Debt securities	￦	1	￦	1	￦	4	￦	4	￦	10	￦	10
Equity securities		12		12		13		13		13		13
Total—Financial assets designated at FVTPL	￦	13	￦	13	￦	17	￦	17	￦	23	￦	23
Available-for-sale financial assets
Equity securities	￦	1,338	￦	1,338	￦	1,454	￦	1,454	￦	1,411	￦	1,411
Beneficiary certificates		1,118		1,118		2,822		2,822		713		713
Others		726		726		494		494		170		170
Debt securities
Korean treasury and government agencies		3,559		3,559		3,789		3,789		2,331		2,331
Financial institutions		5,626		5,626		6,314		6,314		5,217		5,217
Corporate		3,888		3,888		4,409		4,409		2,725		2,725
Asset backed securities		258		258		249		249		308		308
Foreign currency bonds		638		638		1,212		1,212		2,443		2,443
Others		20		20		75		75		35		35
Total—Available-for-sale financial assets	￦	17,171	￦	17,171	￦	20,818	￦	20,818	￦	15,353	￦	15,353
Held-to-maturity financial assets
Debt securities
Korean treasury and government agencies	￦	3,367	￦	3,431	￦	3,754	￦	3,774	￦	3,995	￦	3,987
Financial institutions		4,138		4,164		5,169		5,173		7,245		7,233
Corporate		6,021		6,123		4,823		4,874		5,312		5,299
Foreign currency bonds		96		96		164		164		197		197
Total—Held-to-maturity financial assets	￦	13,622	￦	13,814	￦	13,910	￦	13,985	￦	16,749	￦	16,716
Total securities	￦	33,510	￦	33,702	￦	37,454	￦	37,529	￦	34,804	￦	34,771

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Maturity Analysis

The following table categorizes our debt securities by maturity and weighted average yield as of December 31, 2017:

	As of December 31, 2017
	Within 1 year					Over 1 but Within 5 years					Over 5 but Within 10 years					Over 10 years					Total
	(in billions of Won, except percentages)
	Amount		Weighted Average Yield(1)			Amount		Weighted Average Yield(1)			Amount		Weighted Average Yield(1)			Amount		Weighted Average Yield(1)			Amount		Weighted Average Yield(1)
Financial assets at fair value through profit or loss:
Financial assets held for trading
Korean treasury and government agencies	￦	151		2.75	%	￦	263		2.07	%	￦	126		2.24	%	￦	—		—	%	￦	540		2.30	%
Financial institutions		867		1.51			560		1.77			50		3.06			—		—			1,477		1.66
Corporate		354		2.55			253		2.46			20		2.99			—		—			627		2.53
Total	￦	1,372		1.91	%	￦	1,076		2.00	%	￦	196		2.53	%	￦	—		—	%	￦	2,644		2.00	%
Financial assets designated at fair value through profit or loss
Corporate	￦	—		—	%	￦	10		1.72	%	￦	—		—	%	￦	—		—	%	￦	10		1.72	%
Available-for-sale financial assets
Korean treasury and government agencies	￦	1,719		2.38	%	￦	559		2.13	%	￦	49		2.16	%	￦	4		3.39	%	￦	2,331		2.32	%
Financial institutions		3,641		1.66			1,576		1.85			—		—			—		—			5,217		1.72
Corporate		1,917		2.27			718		2.33			90		2.61			—		—			2,725		2.30
Asset backed securities		40		3.01			209		3.16			59		5.09			—		—			308		3.51
Foreign currency bonds		1,007		2.40			1,309		2.20			74		3.30			53		3.87			2,443		2.35
Others		35		2.45			—		—			—		—			—		—			35		2.45
Total	￦	8,359		2.05	%	￦	4,371		2.13	%	￦	272		3.25	%	￦	57		3.84	%	￦	13,059		2.11	%
Held-to-maturity financial assets
Korean treasury and government agencies	￦	1,874		2.64	%	￦	2,113		2.15	%	￦	8		4.58	%	￦	—		—	%	￦	3,995		2.38	%
Financial institutions		4,216		1.59			3,029		1.79			—		—			—		—			7,245		1.68
Corporate		1,052		2.88			3,885		2.51			238		2.49			137		1.96			5,312		2.57
Foreign currency bonds		38		0.64			125		4.35			18		2.78			16		2.89			197		3.39
Total	￦	7,180		2.05	%	￦	9,152		2.21	%	￦	264		2.57	%	￦	153		2.06	%	￦	16,749		2.15	%

⁽¹⁾  The weighted average yield for the portfolio represents the yield to maturity for each individual security, weighted using its book value (which is the amortized cost in the case of held-to-maturity financial assets and the fair value in the case of available-for-sale financial assets and financial assets at fair value through profit or loss).

Risk Concentrations

As of December 31, 2017, we held the following securities of individual issuers where the aggregate book value of those securities exceeded 10% of our owners’ equity at such date. As of December 31, 2017, our owners’ equity was ￦20,366 billion.

	As of December 31, 2017
	Book Value		Market Value
	(in billions of Won)
Name of issuer:
Korean government	￦	6,760	￦	6,751
The Bank of Korea		6,610		6,601
Korea Housing Finance Corporation		3,172		3,159
The Korea Development Bank		4,253		4,252
Total	￦	20,795	￦	20,763

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The Bank of Korea, Korea Housing Finance Corporation and the Korea Development Bank are Korean government entities.

Funding

We fund our lending and other activities using various sources, both domestic and foreign. Our primary funding strategy is to maintain stable and low-cost funding. We have in the past achieved this in part by increasing the average balances of low-cost customer deposits, in particular demand deposits and savings deposits.

Customer deposits are our principal funding source. Customer deposits accounted for 82.2% of our total funding as of December 31, 2015, 82.8% of our total funding as of December 31, 2016 and 82.7% of our total funding as of December 31, 2017.

We also acquire funding through the following sources:

• long-term debt, including the issuance of senior and subordinated debentures and borrowings from government-affiliated funds and entities and other financial institutions;

• short-term borrowings, including borrowings from our trust accounts and from the Bank of Korea, and call money; and

• the issuance of hybrid securities, including bond-type hybrid securities.

As of December 31, 2017, approximately 87.5% of our total funding was denominated in Won.

Deposits

Although the majority of our deposits are short-term, it has been our experience that the majority of our depositors generally roll over their deposits at maturity, providing us with a stable source of funding. See “Item 3.D. Risk Factors—Other risks relating to our business—Our funding is highly dependent on short-term deposits, which dependence may adversely affect our operations.” The following table shows the average balances of our deposits and the average costs of our deposits for the periods indicated:

	For the year ended December 31,
	2015					2016					2017
	Average Balance(1)		Average Cost			Average Balance(1)		Average Cost			Average Balance(1)		Average Cost
	(in billions of Won, except percentages)
Demand deposits	￦	8,376		0.51	%	￦	9,742		0.78	%	￦	8,319		0.63	%
Time deposits and savings deposits		168,212		1.53			181,073		1.20			186,277		1.08
Certificates of deposit		1,880		1.91			3,476		1.70			4,553		1.71
Other deposits(2)		19,294		1.22			23,405		1.05			24,444		0.99
Average total deposits	￦	197,762		1.46	%	￦	217,696		1.17	%	￦	223,593		1.06	%

⁽¹⁾  Average balances are based on daily balances for us and on quarterly balances for all of our subsidiaries and our structured companies.

⁽²⁾  Mutual installment deposits are interest-bearing deposits offered by us, which enable customers to become eligible to apply for loans secured by such deposits while they maintain an account with us. In order to qualify to apply for such a loan, a customer must make required periodic deposits to the mutual installment account for a contracted term of less than five years. Any such loan will be secured in an amount up to the holder’s mutual installment deposit and will be subject to the same loan underwriting policy we apply for other secured loans. For the portion of the loan, if any, that is not secured, we apply the same loan underwriting policy as we would for other unsecured loans.

For a description of our retail deposit products, see “—Business—Consumer Banking—Lending Activities—Mortgage and Home Equity Lending” and “—Business—Consumer Banking—Deposit-Taking Activities.”

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Maturities of Certificates of Deposit and Other Time Deposits

The following table presents, as of December 31, 2017, the remaining maturities of our certificates of deposit and other time deposits which had fixed maturities in excess of ￦100 million:

	As of December 31, 2017
	Certificates of Deposit		Other Time Deposits		Total
	(in billions of Won)
Maturing within three months	￦	1,570	￦	27,067	￦	28,637
After three but within six months		1,443		22,358		23,801
After six but within 12 months		1,167		35,314		36,481
After 12 months		192		3,591		3,783
Total	￦	4,372	￦	88,330	￦	92,702

Long-Term Debt

The aggregate amount of contractual maturities of all long-term debt, which consists of debentures and borrowings with original maturities exceeding one year, as of December 31, 2017 was as follows:

	Amount
	(in billions of Won)
Due in 2018	￦	12,150
Due in 2019		7,970
Due in 2020		8,624
Due in 2021		2,444
Due in 2022		2,862
Thereafter		3,108
Gross long-term debt		37,158
Less: discount		(30	)
Total long-term debt, net	￦	37,128

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Short-Term Borrowings

The following table presents, for the periods indicated, information regarding our short-term borrowings, with an original maturity of one year or less:

	As of and for the year ended December 31,
	2015			2016			2017
	(in billions of Won, except percentages)
Call money
Year-end balance	￦	2,039		￦	1,927		￦	635
Average balance(1)		2,531			1,991			1,527
Maximum balance		3,712			3,250			3,375
Average interest rate(2)		1.3	%		1.3	%		2.0	%
Year-end interest rate		0.3~5.2	%		0.0~5.1	%		1.5~2.7	%
Borrowings from the Bank of Korea(3)
Year-end balance	￦	1,476		￦	1,599		￦	1,404
Average balance(1)		1,335			1,474			1,402
Maximum balance		1,580			1,608			1,457
Average interest rate(2)		0.7	%		0.7	%		0.7	%
Year-end interest rate		0.5-0.8	%		0.5~0.8	%		0.5~0.8	%
Other short-term borrowings(4)
Year-end balance	￦	7,095		￦	5,974		￦	6,750
Average balance(1)		7,078			7,192			7,087
Maximum balance		7,905			9,722			7,694
Average interest rate(2)		1.5	%		1.3	%		1.4	%
Year-end interest rate		0.2~3.8	%		0.01~2.9	%		0.01~5.0	%

⁽¹⁾  Average balances are based on monthly balances.

⁽²⁾  Average interest rates for the year are calculated by dividing the total interest expense by the average amount borrowed.

⁽³⁾  Borrowings from the Bank of Korea generally mature within one month for borrowings in Won and six months for borrowings in foreign currencies.

⁽⁴⁾  Other short-term borrowings include borrowings from trust accounts, bills sold, borrowings in domestic and foreign currency, short-term secured borrowings and foreign currency debentures. Other short-term borrowings have maturities of 30 days to one year and are unsecured.

Supervision and Regulation

Principal Regulations Applicable to Banks

General

The banking system in Korea is governed by the Bank Act of 1950, as amended and the Bank of Korea Act of 1950, as amended. In addition, Korean banks are subject to the regulations and supervision of the Bank of Korea, the Monetary Policy Committee of the Bank of Korea, the Financial Services Commission and its executive body, the Financial Supervisory Service.

The Bank of Korea, established in June 1950 under the Bank of Korea Act, performs the customary functions of a central bank. It seeks to contribute to the sound development of the national economy by price stabilization through establishing and implementing efficient monetary and credit policies with a focus on financial stability. The Bank of Korea acts under instructions of the Monetary Policy Committee, the supreme policy-making body of the Bank of Korea.

Under the Bank of Korea Act, the Monetary Policy Committee’s primary responsibilities are to formulate monetary and credit policies and to determine the operations, management and administration of the Bank of Korea.

The Financial Services Commission, established on April 1, 1998, regulates commercial banks pursuant to the Bank Act, including establishing guidelines on capital adequacy of commercial banks, and promulgates regulations relating to supervision of banks. Furthermore, the Financial Services Commission regulates market entry into the banking business.

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The Financial Supervisory Service, established on January 2, 1999, is subject to the instructions and directives of the Financial Services Commission and carries out supervision and examination of commercial banks. In particular, the Financial Supervisory Service sets requirements both for the prudent control of liquidity and for capital adequacy and establishes reporting requirements pursuant to the authority delegated to it under the Financial Services Commission regulations, pursuant to which banks are required to submit annual reports on financial performance and shareholdings, regular reports on management strategy and non-performing loans, including write-offs, and management of problem companies and plans for the settlement of bad loans.

Under the Bank Act, approval to commence a commercial banking business or a long-term financing business must be obtained from the Financial Services Commission. Commercial banking business is defined as the lending of funds acquired predominantly from the acceptance of demand deposits for a period not exceeding one year or subject to the limitation established by the Financial Services Commission, for a period between one year and three years. Long-term financing business is defined as the lending, for periods in excess of one year, of funds acquired predominantly from paid-in capital, reserves or other retained earnings, the acceptance of time deposits with maturities of at least one year, or the issuance of debentures or other bonds. A bank wishing to enter into any business other than commercial banking and long-term financing businesses, such as the trust business, must obtain approval from the Financial Services Commission. Approval to merge with any other banking institution, to liquidate, to spin off, to close a banking business or to transfer all or a part of a business must also be obtained from the Financial Services Commission.

If the Financial Services Commission deems a bank’s financial condition to be unsound or if a bank fails to meet the applicable capital adequacy ratio set forth under Korean law, the Financial Services Commission may order:

• admonitions or warnings with respect to its officers;

• capital increases or reductions;

• assignments of contractual rights and obligations relating to financial transactions;

• a suspension of performance by its officers of their duties and the appointment of receivers;

• disposals of property holdings or closures of subsidiaries or branch offices or downsizing;

• stock cancellations or consolidations;

• mergers with other financial institutions;

• acquisition of such bank by a third party; or

• suspensions of a part or all of its business operations.

Capital Adequacy

The Bank Act requires nationwide banks, such as us, to maintain a minimum paid-in capital of ￦100 billion and regional banks to maintain a minimum paid-in capital of ￦25 billion. All banks, including foreign bank branches in Korea, are also required to maintain a prescribed solvency position. A bank must also set aside in its legal reserve an amount equal to at least 10% of the net income after tax each time it pays dividends on net profits earned until its legal reserve reaches at least the aggregate amount of its paid-in capital.

Under the Detailed Regulation on the Supervision of the Banking Business, the capital of a bank is divided into two categories, Tier I and Tier II capital. Tier I capital (core capital) consists of (i) Tier I common equity capital, including paid-in capital, capital surplus and retained earnings related to common equity and accumulated other comprehensive gains and losses, and (ii) additional Tier I capital, including paid-in capital and capital surplus related to hybrid Tier I capital instruments that, among other things, qualify as contingent capital and are subordinated to subordinated debt. Tier II capital (supplementary capital) consists of, among other things, capital and capital surplus from the issuance of Tier II capital instruments, allowances for loan losses on loans classified as “normal” or “precautionary,” subordinated debt and other capital securities which meet the standards prescribed by the governor of the Financial Supervisory Service under Article 26(2) of the Regulation on the Supervision of the Banking Business.

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All banks must meet minimum ratios of Tier I and Tier II capital (less any capital deductions) to risk-weighted assets, determined in accordance with Financial Services Commission requirements that have been formulated based on BIS standards. These requirements were adopted and became effective in 1996, and were amended effective January 1, 2008 upon the implementation by the Financial Supervisory Service of Basel II. Under such requirements, all domestic banks and foreign bank branches must meet a minimum ratio of Tier I and Tier II capital (less any capital deductions) to risk-weighted assets of 8.0%. Commencing in July 2013, the Financial Services Commission promulgated a series of amended regulations implementing Basel III in Korea, pursuant to which Korean banks and bank holding companies were required to maintain a minimum ratio of Tier I common equity capital to risk-weighted assets of 3.5% and Tier I capital to risk-weighted assets of 4.5% from December 1, 2013, which minimum ratios were increased to 4.0% and 5.5%, respectively, from January 1, 2014 and increased further to 4.5% and 6.0%, respectively, from January 1, 2015. Such requirements are in addition to the pre-existing requirement for a minimum ratio of Tier I and Tier II capital (less any capital deductions) to risk-weighted assets of 8.0%, which remains unchanged. The amended regulations also require an additional capital conservation buffer of 1.25% in 2017 and 1.875% in 2018, with such buffer to increase to 2.5% in 2019, as well as a potential counter-cyclical capital buffer of up to 2.5%, which is determined on a quarterly basis by the Financial Services Commission. Furthermore, we were designated as one of six domestic systemically important banks for 2017 by the Financial Services Commission and were subject to an additional capital requirement of 0.5% in 2017. In June 2017, we were again designated as a domestic systemically important bank for 2018, which would subject us to an additional capital requirement of 0.75% in 2018, with such potential requirement to increase to 1.0% in 2019.

Under the Detailed Regulation on the Supervision of the Banking Business, the following risk-weight ratios must be applied by Korean banks in respect of home mortgage loans:

(1) for those banks which adopted a standardized approach for calculating credit risk capital requirements, a risk-weight ratio of 35% (only in the case where the loan is fully secured by a first ranking mortgage) and, with respect to high-risk home mortgage loans, 50% or 70%; and

(2) for those banks which adopted an internal ratings-based approach for calculating credit risk capital requirements, a risk-weight ratio calculated with reference to the probability of default, loss given default and exposure at default, each as defined under the Detailed Regulation on the Supervision of the Banking Business.

Liquidity

All banks are required to ensure adequate liquidity by matching the maturities of their assets and liabilities in accordance with the Regulation on the Supervision of the Banking Business. Banks may not invest an amount exceeding 100% of their Tier I and Tier II capital (less any capital deductions) in equity securities and certain other securities with a redemption period of over three years. This stipulation does not apply to Korean government bonds, Monetary Stabilization Bonds issued by the Bank of Korea or debentures and stocks referred to in items 1 and 2, respectively, of paragraph (6) of Article 11 of the Act on the Improvement of the Structure of the Financial Industry. The Financial Services Commission uses the liquidity coverage ratio as the principal liquidity risk management measure, and currently requires each Korean bank to:

• maintain a liquidity coverage ratio (defined as the ratio of highly liquid assets to total net cash outflows over a 30-day period) of not less than 95%, from January 1, 2018 until December 31, 2018, with such minimum liquidity coverage ratio to increase to 100% in 2019;

• maintain a foreign currency liquidity coverage ratio of not less than 70% from January 1, 2018 until December 31, 2018, with such minimum foreign currency liquidity coverage ratio to increase to 80% in 2019; provided, however, that the foreign currency liquidity ratio (defined as the ratio of foreign currency assets due within three months to foreign currency liabilities due within three months) would apply if the amount of foreign currency assets and the ratio of foreign currency liabilities to total liabilities are less than the respective amount and ratio, or in certain other cases, specified under the Bank Act and the regulations thereunder; and

• submit monthly reports with respect to the maintenance of these ratios.

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The Monetary Policy Committee of the Bank of Korea is empowered to fix and alter minimum reserve requirements that banks must maintain against their deposit liabilities. The current minimum reserve ratios are:

• 7% of average balances for Won currency demand deposits outstanding;

• 0% of average balances for Won currency employee asset establishment savings deposits, employee long-term savings deposits, employee house purchase savings deposits, long-term house purchase savings deposits, household long-term savings deposits and employee preferential savings deposits outstanding (with respect to employee-related deposits, only if such deposits were made before February 28, 2013); and

• 2% of average balances for Won currency time deposits, installment savings deposits, mutual installments, housing installments and certificates of deposit outstanding.

For foreign currency deposit liabilities, a 2% minimum reserve ratio is applied to time deposits with a maturity of one month or longer, certificates of deposit with a maturity of 30 days or longer and savings deposits with a maturity of six months or longer and a 7% minimum reserve ratio is applied to other deposits. A 1% minimum reserve ratio applies to deposits in offshore accounts, immigrant accounts and resident accounts opened by foreign exchange banks as well as foreign currency certificates of deposit held by account holders of such offshore accounts, immigrant accounts and resident accounts opened by foreign exchange banks.

Furthermore, under the Regulation on the Supervision of the Banking Business, we are required to maintain a minimum “mid- to long-term foreign exchange funding ratio” of 100%. “Mid-to long term foreign exchange funding ratio” refers to the ratio of (1) the total outstanding amount of foreign exchange borrowing with a maturity of more than one year to (2) the total outstanding amount of foreign exchange lending with a maturity of one year or more.

Amendments Relating to Net Stable Funding Ratio and Leverage Ratio Requirements

Effective January 31, 2018, the Financial Services Commission implemented amendments to the Regulation on Supervision of the Banking Business that impose certain liquidity- and leverage-related ratio requirements on banks in Korea, in accordance with Basel III. Pursuant to these amendments, each Korean bank is required to:

• maintain a net stable funding ratio (defined as the ratio of the available amount of stable funding to the required amount of stable funding) of not less than 100%, where (i) the available amount of stable funding generally refers to the portion of liabilities and capital expected to be reliable over a one-year time horizon and (ii) the required amount of stable funding generally refers to the portion of assets requiring stable funding over a time horizon of one year or longer, each as calculated in accordance with the Detailed Regulation on Supervision of the Banking Business;

• maintain a leverage ratio (defined as the ratio of core capital to total exposures) of not less than 3%, where (i) core capital includes paid-in capital, capital surplus, retained earnings and hybrid Tier I capital instruments and (ii) total exposures include on-balance sheet exposures and off-balance sheet exposures, each as calculated in accordance with the Detailed Regulation on Supervision of the Banking Business; and

• submit monthly reports with respect to the maintenance of these ratios.

Financial Exposure to Any Individual Customer or Major Shareholder

Under the Bank Act, subject to certain exceptions, the sum of large exposures by a bank—in other words, the total sum of its credits to single individuals, juridical persons or business groups that exceed 10% of the sum of Tier I and Tier II capital (less any capital deductions)—generally must not exceed five times the sum of Tier I and Tier II capital (less any capital deductions). In addition, subject to certain exceptions, banks generally may not extend credit (including loans, guarantees, purchases of securities (only in the nature of a credit) and any other transactions that directly or indirectly create credit risk) in excess of 20% of the sum of Tier I and Tier II capital (less any capital deductions) to a single individual or juridical person, or grant credit in excess of 25% of

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the sum of Tier I and Tier II capital (less any capital deductions) to a single group of companies as defined in the Monopoly Regulations and Fair Trade Act.

The Bank Act also provides for certain restrictions on extending credits to a major shareholder. A “major shareholder” is defined as:

• a shareholder holding (together with persons who have a special relationship with that shareholder) in excess of 10%; (or 15% in the case of regional banks) in the aggregate of the bank’s total issued and outstanding voting shares; or

• a shareholder holding (together with persons who have a special relationship with such shareholder) in excess of 4% in the aggregate of the bank’s (excluding regional banks) total issued and outstanding voting shares of a bank (excluding shares subject to the shareholding restrictions on “non-financial business group companies” as described below), where such shareholder is the largest shareholder or has actual control over the major business affairs of the bank through, for example, appointment and dismissal of the officers pursuant to the Enforcement Decree of the Bank Act. Non-financial business group companies primarily consist of: (i) any single shareholding group whose non-financial company assets comprise no less than 25% of its aggregate net assets; (ii) any single shareholding group whose non-financial company assets comprise no less than ￦2 trillion in aggregate; or (iii) any investment company under the Financial Investment Services and Capital Markets Act of which any single shareholding group identified in (i) or (ii) above, owns more than 4% of the total issued and outstanding shares. See “—Supervision and Regulation—Principal Regulations Applicable to Banks—Restrictions on Bank Ownership.”

Under these restrictions, banks may not extend credits to a major shareholder (together with persons who have a special relationship with that shareholder) in an amount greater than the lesser of (x) 25% of the sum of the bank’s Tier I and Tier II capital (less any capital deductions) and (y) the relevant major shareholders’ shareholding ratio multiplied by the sum of the bank’s Tier I and Tier II capital (less any capital deductions). In addition, the total sum of credits granted to all major shareholders must not exceed 25% of the bank’s Tier I and Tier II capital (less any capital deductions).

Interest Rates

Korean banks generally depend on deposits as their primary funding source. Under the Act on Registration of Credit Business and Protection of Finance Users, as last amended in March 2016, interest rates on loans made by registered banks in Korea to individuals or small corporations, as defined under the Framework Act on Small and Medium Enterprises, may not exceed 27.9% per annum. Such restriction is scheduled to expire on December 31, 2018. Historically, interest rates on deposits and lending were regulated by the Monetary Policy Committee. There are no controls on deposit interest rates in Korea, except for the prohibition on interest payments on current account deposits.

Lending to Small- and Medium-Sized Enterprises

In order to obtain funding from the Bank of Korea at concessionary rates for their small- and medium-sized enterprise loans, banks are required to allocate a certain minimum percentage of any quarterly increase in their Won currency lending to small- and medium-sized enterprises. Currently, this minimum percentage is 45% in the case of nationwide banks and 60% in the case of regional banks. If a bank does not comply with this requirement, the Bank of Korea may:

• require the bank to prepay all or a portion of funds provided to that bank in support of loans to small- and medium-sized enterprises; or

• lower the bank’s credit limit.

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Disclosure of Management Performance

For the purpose of protecting depositors and investors in commercial banks, the Financial Services Commission requires commercial banks to publicly disclose certain material matters, including:

• financial condition and profit and loss of the bank and its subsidiaries;

• fund raising by the bank and the appropriation of such funds;

• any sanctions levied on the bank under the Bank Act or any corrective measures or sanctions under the Law on Improvement of Structure of Financial Industry; and

• except as may otherwise have been disclosed by a bank or its financial holding company listed on the KRX KOSPI Market in accordance with the Financial Investment Services and Capital Markets Act, occurrence of any of the following events or any other event as prescribed by the applicable regulations:

(i) loans bearing no profit made to a single business group in an amount exceeding 10% of the sum of the bank’s Tier I and Tier II capital (less any capital deductions) as of the end of the previous month (where the loan exposure to that borrower is calculated pursuant to the criteria under the Detailed Regulation on the Supervision of the Banking Business), unless the loan exposure to that group is not more than ￦4 billion; and

(ii) any loss due to court judgments or similar decisions in civil proceedings in an amount exceeding 1% of the sum of the bank’s Tier I and Tier II capital (less any capital deductions) as of the end of the previous month, unless the loss is not more than ￦1 billion.

Restrictions on Lending

Pursuant to the Bank Act, commercial banks may not provide:

• loans directly or indirectly secured by a pledge of a bank’s own shares;

• loans directly or indirectly to enable a natural or juridical person to buy the bank’s own shares;

• loans to any of the bank’s officers or employees, other than de minimis loans of up to (i) ￦20 million in the case of a general loan, (ii) ￦50 million in the case of a general loan plus a housing loan or (iii) ￦60 million in the aggregate for general loans, housing loans and loans to pay damages arising from wrongful acts of employees in financial transactions;

• credit (including loans) secured by a pledge of shares of a subsidiary corporation of the bank or to enable a natural or juridical person to buy shares of a subsidiary corporation of the bank; or

• loans to any officers or employees of a subsidiary corporation of the bank, other than general loans of up to ￦20 million or general and housing loans of up to ￦50 million in the aggregate.

Regulations Relating to Retail Household Loans

The Financial Services Commission has implemented a number of changes in recent years to the regulations relating to retail household lending by banks. Under the currently applicable regulations:

• as to loans secured by collateral of housing (including apartments) located nationwide, the loan-to-value ratio (the aggregate principal amount of loans secured by such collateral over the appraised value of the collateral) should not exceed 70%;

• as to loans secured by collateral of housing (including apartments) located in areas of excessive investment or housing (including apartments) located in areas of high speculation, in each case as designated by the government, (i) the loan-to-value ratio should not exceed 40%, except that the loan-to-value ratio for first-home buyers, low-income households with an annual income of less than ￦70 million (for first home buyers, ￦80 million) or buyers of low-price housing valued at less than ￦600 million should not exceed 50%;

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• as to any new loans secured by collateral of housing to be extended to a household, any member of which has already received one or more loans secured by the collateral of housing, the maximum loan-to-value ratio is 10% lower than the applicable loan-to-value ratio described above;

• as to loans secured by collateral of housing (including apartments) located in areas of excessive investment or housing (including apartments) located in areas of high speculation, in each case, as designated by the government, the borrower’s debt-to-income ratio (calculated as (i) the aggregate annual total payment amount of (x) the principal of and interest on loans secured by such housing and (y) the interest on other debts of the borrower over (ii) the borrower’s annual income) should not exceed 40%, except that the debt-to-income ratio for first-home buyers, low-income households with an annual income of less than ￦70 million or buyers of low-price housing valued at less than ￦600 million should not exceed 50%;

• as to any new loans secured by collateral of housing to be extended to a household, any member of which has already received one or more loans secured by collateral of housing, the maximum debt-to-income ratio is 10% lower than the applicable debt-to-income ratio described above;

• as to apartments located in areas of high speculation as designated by the government, a household is permitted to have only one new loan secured by such apartment; and

• where a household has two or more loans secured by apartments located in areas of high speculation as designated by the government, the loan with the earliest maturity date must be repaid first and the number of loans must be eventually reduced to one.

Restrictions on Investments in Property

A bank may not invest in securities set forth below in excess of 100% of the sum of the bank’s Tier I and Tier II capital (less any capital deductions):

• debt securities (within the meaning of paragraph (3) of Article 4 of the Financial Investment Services and Capital Markets Act) the maturity of which exceeds three years, but excluding government bonds, monetary stabilization bonds issued by the Bank of Korea and bonds within the meaning of item 2, paragraph (6) of Article 11 of the Act on the Improvement of the Structure of the Financial Industry;

• equity securities, but excluding securities within the meaning of item 1, paragraph (6) of Article 11 of the Act on the Improvement of the Structure of the Financial Industry;

• derivatives linked securities (within the meaning of paragraph (7) of Article 4 of the Financial Investment Services and Capital Markets Act) the maturity of which exceeds three years; and

• beneficiary certificates, investment contracts and depositary receipts (within the meaning of paragraph (2) of Article 4 of the Financial Investment Services and Capital Markets Act) the maturity of which exceeds three years.

A bank may possess real estate property only to the extent necessary for the conduct of its business. The aggregate value of such property may not exceed 60% of the sum of the bank’s Tier I and Tier II capital (less any capital deductions). Any property that a bank acquires by exercising its rights as a secured party, or which a bank is prohibited from acquiring under the Bank Act, must be disposed of within three years, unless specified otherwise by the regulations thereunder.

Restrictions on Shareholdings in Other Companies

Under the Bank Act, a bank may not own more than 15% of shares outstanding with voting rights of another corporation, except where, among other reasons:

• that corporation engages in a category of financial businesses set forth by the Financial Services Commission; or

• the acquisition of shares by the bank is necessary for the corporate restructuring of such corporation and is approved by the Financial Services Commission.

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• In the above exceptional cases, the total investment in corporations in which the bank owns more than 15% of the outstanding shares with voting rights may not exceed (i) 20% of the sum of Tier I and Tier II capital (less any capital deductions) or (ii) 30% of the sum of Tier I and Tier II capital (less any capital deductions) where the acquisition satisfies the requirements determined by the Financial Services Commission.

The Bank Act provides that a bank using its bank accounts and its trust accounts is not permitted to acquire the shares issued by the major shareholder of such bank in excess of an amount equal to 1% of the sum of Tier I and Tier II capital (less any capital deductions).

Restrictions on Bank Ownership

Under the Bank Act, a single shareholder and persons who have a special relationship with that shareholder generally may acquire beneficial ownership of no more than 10% of a nationwide bank’s total issued and outstanding shares with voting rights and no more than 15% of a regional bank’s total issued and outstanding shares with voting rights. The Korean government, the KDIC and bank holding companies qualifying under the Financial Holding Company Act are not subject to this limit. However, pursuant to an amendment to the Bank Act which became effective on February 14, 2014, non-financial business group companies may not acquire beneficial ownership of shares of a nationwide bank in excess of 4% of that bank’s outstanding voting shares (or 15% in the case of a regional bank), unless they satisfy certain requirements set forth by the Enforcement Decree of the Bank Act, obtain the approval of the Financial Services Commission and agree not to exercise voting rights in respect of shares in excess of the 4% limit (or the 15% limit in the case of a regional bank), in which case they may acquire beneficial ownership of up to 10% of a nationwide bank’s outstanding voting shares. Such amendment grants an exception for non-financial business group companies which, at the time of the enactment of the amended provisions, held more than 4% of the shares of a bank.

“Non-financial business group companies” as defined under the Bank Act include:

(1) any same shareholder group with aggregate net assets of all non-financial business companies belonging to such group of not less than 25% of the aggregate net assets of all members of such group;

(2) any same shareholder group with aggregate assets of all non-financial business companies belonging to such group of not less than ￦2 trillion;

(3) any mutual fund in which a same shareholder group identified in item (1) or (2) above beneficially owns and/or exercises the voting rights of more than 4% of the total issued and outstanding voting shares of such mutual fund;

(4) any private equity fund with (a) a person falling under any of items (1) through (3) above as a limited partner holding not less than 10% of the total amount of contributions to the private equity fund, or (b) a person falling under any of items (1) through (3) above as a general partner, or (c) the total equity of the private equity fund acquired by each affiliate belonging to several enterprise groups subject to the limitation on mutual investment being 30% or more of the total amount of contributions to the private equity fund; or

(5) any investment purpose company in which a private equity fund falling under item (4) above acquires or holds shares in excess of 4% of the shares or equity of such company or exercises de facto control over significant managerial matters of such company through appointment or dismissal of executives or in any other manner.

In addition, if a foreign investor, as defined in the Foreign Investment Promotion Act, owns in excess of 4% of a nationwide bank’s outstanding voting shares, non-financial business group companies may acquire beneficial ownership of up to 10% of that bank’s outstanding voting shares (or 15% in the case of a regional bank), and in excess of 10% (or 15% in the case of a regional bank), 25% or 33% of that bank’s outstanding voting shares with the approval of the Financial Services Commission in each instance, up to the number of shares owned by the foreign investor. Any other person (whether a Korean national or a foreign investor), with

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the exception of non-financial business group companies described above, may acquire no more than 10% of a nationwide bank’s total voting shares issued and outstanding, unless they obtain approval from the Financial Services Commission in each instance where the total holding will exceed 10% (or 15% in the case of regional banks), 25% or 33% of the bank’s total voting shares issued and outstanding provided that, in addition to the foregoing threshold shareholding ratios, the Financial Services Commission may, at its discretion, designate a separate and additional threshold shareholding ratio.

Deposit Insurance System

The Depositor Protection Act provides insurance for certain deposits of banks in Korea through a deposit insurance system. Under the Depositor Protection Act, all banks governed by the Bank Act are required to pay an insurance premium to the KDIC on a quarterly basis, and the rate is determined under the Enforcement Decree to the Depositor Protection Act. If the KDIC makes a payment on an insured amount, it will acquire the depositors’ claims with respect to that payment amount. The KDIC insures a maximum of ￦50 million per individual for deposits and interest in a single financial institution, regardless of when the deposits were made and the size of the deposits. Certain banks governed by the Bank Act, including us, are also required by the Deposit Insurance Act to pay a special contribution of 0.025% of average deposits for each quarter as repayment of the governmental funding provided to such banks in the wake of the financial crisis in Korea in the late 1990s. The Depositor Protection Act requires such special contribution to be paid until 2027.

Restrictions on Foreign Exchange Position

Under the Korean Foreign Exchange Transaction Law, each of a bank’s net overpurchased and oversold positions may not exceed 50% of its shareholder’s equity as of the end of the prior month.

Laws and Regulations Governing Other Business Activities

A bank must register with the Ministry of Strategy and Finance to enter the foreign exchange business, which is governed by the Foreign Exchange Transaction Act of Korea. A bank must obtain the permission of the Financial Services Commission to enter the securities business, which is governed by regulations under the Financial Investment Services and Capital Markets Act. Under these laws, a bank may engage in the foreign exchange business, securities repurchase business, governmental/public bond underwriting business and governmental bond dealing business.

Regulations on Trust Business

A bank must obtain approval from the Financial Services Commission to engage in trust businesses. The Trust Act and the Financial Investment Services and Capital Markets Act govern the trust activities of banks, and they are subject to various legal and accounting procedures and requirements, including the following:

• under the Trust Act, assets accepted in trust by a bank in Korea must be segregated from other assets in the accounts of that bank; and

• depositors and other general creditors cannot obtain or assert claims against the assets comprising the trust accounts in the event the bank is liquidated or wound-up.

The bank must make a special reserve of 25% or more of fees from each unspecified money trust account for which a bank guarantees the principal amount and a fixed rate of interest until the total reserve for that account equals 5% of the trust amount. Since January 1999, the Korean government has prohibited Korean banks from offering new guaranteed fixed rate trust account products whose principal and interest are guaranteed.

Under the Financial Investment Services and Capital Markets Act, which became effective in February 2009, a bank with a trust business license (such as us) is permitted to offer both specified money trust account products and unspecified money trust account products. Previously, banks were not permitted to offer unspecified money trust account products pursuant to the Indirect Investment Asset Management Act, which is no longer in effect following the effectiveness of the Financial Investment Services and Capital Markets Act.

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Regulations on Credit Card Business

General

In order to enter the credit card business, a company must obtain a license from the Financial Services Commission. Credit card businesses are governed by the Specialized Credit Financial Business Act, enacted on August 28, 1997 and last amended on April 18, 2017, which sets forth specific requirements with respect to the credit card business as well as generally prohibiting unsound business practices relating to the credit card business which may infringe on the rights of credit card holders or negatively affect the soundness of the credit card industry. Credit card companies, including our wholly-owned subsidiary, Woori Card, are regulated by the Financial Services Commission and the Financial Supervisory Service.

Disclosure and Reports

Under the Specialized Credit Financial Business Act and the regulations thereunder, a credit card company is required to disclose on a periodic and on-going basis certain material matters and events. In addition, a credit card company must submit its business reports with respect to its results of operations to the Governor of the Financial Supervisory Service within one month from the end of each quarter for quarterly reports and within 10 days from the end of each month for monthly reports.

Restrictions on Funding

Under the Specialized Credit Financial Business Act and the regulations thereunder, a credit card company must ensure that its total assets do not exceed an amount equal to six times its equity capital and that the ratio of its adjusted equity capital to its adjusted total assets is not less than 8%. However, if a credit card company is unable to comply with such limit upon the occurrence of unavoidable events, such as drastic changes in the domestic and global financial markets, such limit may be adjusted through a resolution of the Financial Services Commission.

Risk of Loss Due to Lost, Stolen, Forged or Altered Credit Cards

Under the Specialized Credit Financial Business Act, a credit card company is liable for any loss arising from the unauthorized use of credit cards or debit cards after it has received notice from the holder of the loss or theft of the card. A credit card company is also responsible for any losses resulting from the use of forged or altered credit cards, debit cards and pre-paid cards. A credit card company may, however, transfer all or part of this latter risk of loss to holders of credit card in the event of willful misconduct or gross negligence by holders of credit card if the terms and conditions of the agreement entered between the credit card company and members of such cards specifically provide for that transfer.

For these purposes, disclosure of a customer’s password that is made intentionally or through gross negligence, or the transfer of or giving as collateral of the credit card or debit card, is considered willful misconduct or gross negligence. However, a disclosure of a cardholder’s password that is made under irresistible force or threat to cardholder or his/her relatives’ life or health will not be deemed as willful misconduct or negligence of the cardholder.

Each credit card company must institute appropriate measures to fulfill these obligations, such as establishing provisions, purchasing insurance or joining a cooperative association.

Pursuant to the Enforcement Decree to the Specialized Credit Financial Business Act, a credit card company will be liable for any losses arising from loss or theft of a credit card (which was not from the holder’s willful misconduct or negligence) during the period beginning 60 days before the notice by the holder to the credit card company.

Pursuant to the Specialized Credit Financial Business Act, the Financial Services Commission may either restrict the limit or take other necessary measures against the credit card company with respect to such matters as

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the maximum limits on the amount per credit card, details of credit card terms and conditions, management of credit card merchants and collection of claims, including the following:

• maximum limits for cash advances on credit cards;

• use restrictions on debit cards with respect to per day or per transaction usage;

• aggregate issuance limits and maximum limits on the amount per card on pre-paid cards; and

• other matters prescribed by the Enforcement Decree to the Specialized Credit Financial Business Act.

Lending Ratio in Ancillary Business

Pursuant to the Enforcement Decree to the Specialized Credit Financial Business Act, a credit card company must maintain an aggregate quarterly average outstanding lending balance to credit cardholders (including cash advances and credit card loans, but excluding restructured loans) no greater than the sum of (i) its aggregate quarterly average outstanding credit card balance arising from the purchase of goods and services and (ii) the aggregate quarterly debit card transaction volume.

Issuance of New Cards and Solicitation of New Cardholders

The Enforcement Decree to the Specialized Credit Financial Business Act establishes the conditions under which a credit card company may issue new cards and solicit new members. New credit cards may be issued only to the following persons:

• persons who are at least 19 years old when they apply for a credit card;

• persons whose capability to pay bills as they come due has been verified using standards established by the credit card company; and

• in the case of minors who are 18 years old, persons who submit documents evidencing employment as of the date of the credit card application, such as an employment certificate, or persons for whom the issuance of a credit card is necessitated by governmental policies, such as financial aid.

In addition, a credit card company may not solicit credit card members by:

• providing or promising to provide economic benefits in excess of 10% of the annual credit card fee (in the case of credit cards with annual fees that are less than the average of the annual fees charged by the major credit cards in Korea, the annual fee will be deemed to be equal to such average annual fee) in connection with issuing a credit card; provided, however, that providing or promising to provide economic benefits not exceeding the amount of the annual credit card fee to an applicant that becomes a credit card member through an online platform is permissible;

• soliciting applicants on roads, public places or along corridors used by the general public;

• soliciting applicants through visits, except those visits made upon prior consent and visits to a business area;

• soliciting applicants through the Internet without verifying whether the applicant is who he or she purports to be, by means of a certified digital signature under the Digital Signature Act; and

• soliciting applicants through pyramid sales methods.

Compliance Rules on Collection of Receivable Claims

Pursuant to Supervisory Regulation on the Specialized Credit Financial Business, a credit card company may not:

• exert violence or threaten violence;

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• inform a related party (a guarantor of the debtor, blood relative or fiancée of the debtor, a person living in the same household as the debtor or a person working in the same workplace as the debtor) of the debtor’s obligations without just cause;

• provide false information relating to the debtor’s obligation to the debtor or his or her related parties;

• threaten to sue or sue the debtor for fraud despite lack of affirmative evidence to establish that the debtor has submitted forged or false documentation with respect to his/her ability to make payment;

• visit or telephone the debtor during late evening hours (between the hours of 9:00 p.m. and 8:00 a.m.); and

• utilize other uncustomary methods to collect the receivables that interfere with the privacy or the peace in the workplace of the debtor or his or her related parties.

Regulations on Class Actions Regarding Securities

The Law on Class Actions Regarding Securities was enacted as of January 20, 2004 and last amended on May 28, 2013. The Law on Class Actions Regarding Securities governs class actions suits instituted by one or more representative plaintiff(s) on behalf of 50 or more persons who claim to have been damaged in a capital markets transaction involving securities issued by a listed company in Korea.

Applicable causes of action with respect to such suits include:

• claims for damages caused by misleading information contained in a securities statement;

• claims for damages caused by the filing of a misleading business report, semi-annual report, or quarterly report;

• claims for damages caused by insider trading or market manipulation; and

• claims instituted against auditors for damages caused by accounting irregularities.

Any such class action may be instituted upon approval from the presiding court and the outcome of such class action will have a binding effect on all potential plaintiffs who have not joined the action, with the exception of those who have filed an opt out notice with such court.

Regulations on Financial Investment Business

General

The Financial Investment Services and Capital Markets Act, which became effective in February 2009, regulates and governs the financial investment business in Korea. The entities that regulate and supervise financial investment companies are the Financial Services Commission, the Financial Supervisory Service and the Securities and Futures Commission.

Under the Financial Investment Services and Capital Markets Act, a company must obtain a license from the Financial Services Commission to commence a financial investment business such as a brokerage business, a dealing business or an underwriting business, or register with the Financial Services Commission to commence a financial investment business such as an investment advisory business or a discretionary investment management business. A bank is permitted to engage in certain types of financial investment business as specified under the Enforcement Decree of the Bank Act. Prior to commencing a financial investment business, a bank must file a report with the Financial Services Commission and apply for a license pursuant to the Financial Investment Services and Capital Markets Act.

Consolidation of Capital Markets-Related Laws

Prior to the effectiveness of the Financial Investment Services and Capital Markets Act, there were separate laws regulating various types of financial institutions depending on the type of financial institution (e.g.,

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securities companies, futures companies, trust business companies and asset management companies) and subjecting financial institutions to different licensing and ongoing regulatory requirements (e.g., the Korean Securities Exchange Act, the Futures Business Act and the Indirect Investment Asset Management Business Act). By applying one uniform set of rules to the same financial business having the same economic function, the Financial Investment Services and Capital Markets Act attempts to improve and address issues caused by the previous regulatory system under which the same economic function relating to capital markets-related businesses was governed by multiple regulations. To this end, the Financial Investment Services and Capital Markets Act categorizes capital markets-related businesses into six different functions:

• dealing, trading and underwriting of “financial investment products” (as defined below);

• brokerage of financial investment products;

• establishment of collective investment schemes and the management thereof;

• investment advice;

• discretionary investment management; and

• trusts (together with the five businesses set forth above, the “Financial Investment Businesses”).

Accordingly, all financial businesses relating to financial investment products have been reclassified as one or more of the Financial Investment Businesses described above, and financial institutions are subject to the regulations applicable to their relevant Financial Investment Businesses, regardless of the type of the financial institution. For example, under the Financial Investment Services and Capital Markets Act, derivative businesses conducted by former securities companies and future companies will be subject to the same regulations.

Banking and insurance businesses are not subject to the Financial Investment Services and Capital Markets Act and will continue to be regulated under separate laws. However, they may become subject to the Financial Investment Services and Capital Markets Act if their activities involve any financial investment businesses requiring a license pursuant to the Financial Investment Services and Capital Markets Act.

Comprehensive Definition of Financial Investment Products

In an effort to encompass the various types of securities and derivative products available in the capital markets, the Financial Investment Services and Capital Markets Act sets forth a comprehensive term “financial investment products,” defined to mean all financial products with a risk of loss in the invested amount (in contrast to “deposits,” which are financial products for which the invested amount is protected or preserved). Financial investment products are classified into two major categories: (i) “securities” (financial investment products in which the risk of loss is limited to the invested amount) and (ii) “derivatives” (financial investment products in which the risk of loss may exceed the invested amount). As a result of the general and broad definition of financial investment products, a variety of financial products may be defined as a financial investment product, which would enable Financial Investment Companies (defined below) to handle a broader range of financial products. Under the Financial Investment Services and Capital Markets Act, entities formerly licensed as securities companies, asset management companies, futures companies and other entities engaging in any Financial Investment Business are classified as “Financial Investment Companies.”

New License System and the Conversion of Existing Licenses

Under the Financial Investment Services and Capital Markets Act, Financial Investment Companies are able to choose the type of Financial Investment Business in which to engage (through a “check the box” method set forth in the relevant license application), by specifying the desired (i) Financial Investment Business, (ii) financial investment product and (iii) target customers to which financial investment products may be sold or distributed (that is, general investors or professional investors). Licenses will be issued under the specific business sub-categories described in the foregoing sentence. For example, it would be possible for a Financial Investment Company to obtain a license to engage in the Financial Investment Business of (i) dealing (ii) over the counter derivatives products or (iii) only with sophisticated investors.

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Financial institutions that engage in business activities constituting a Financial Investment Business are required to take certain steps, such as renewal of their license or registration, in order to continue engaging in such business activities. Financial institutions that are not licensed Financial Investment Companies are not permitted to engage in any Financial Investment Business, subject to the following exceptions: (i) banks and insurance companies are permitted to engage in certain categories of Financial Investment Businesses for a period not exceeding six months commencing on the effective date of the Financial Investment Services and Capital Markets Act; and (ii) other financial institutions that engaged in any Financial Investment Business prior to the effective date of the Financial Investment Services and Capital Markets Act (whether in the form of a concurrent business or an incidental business) are permitted to continue such Financial Investment Business for a period not exceeding six months commencing on the effective date of the Financial Investment Services and Capital Markets Act.

Expanded Business Scope of Financial Investment Companies

Under the previous regulatory regime in Korea, it was difficult for a financial institution to explore a new line of business or expand upon its existing line of business. For example, previously a financial institution licensed as a securities company generally was not permitted to engage in the asset management business. In contrast, under the Financial Investment Services and Capital Markets Act, pursuant to the integration of its current businesses involving financial investment products into a single Financial Investment Business, a licensed Financial Investment Company is permitted to engage in all types of Financial Investment Businesses, subject to satisfying relevant regulations (for example, maintaining an adequate “Chinese Wall,” to the extent required). As to incidental businesses (that is, a financial related business which is not a Financial Investment Business), the Financial Investment Services and Capital Markets Act generally allows a Financial Investment Company to freely engage in such incidental businesses by shifting away from the previous positive-list system towards a more comprehensive system. In addition, a Financial Investment Company is permitted to (i) outsource marketing activities by contracting “introducing brokers” that are individuals but not employees of the Financial Investment Company, (ii) engage in foreign exchange businesses related to their Financial Investment Business and (iii) participate in the settlement network, pursuant to an agreement among the settlement network participants.

Improvement in Investor Protection Mechanism

While the Financial Investment Services and Capital Markets Act widens the scope of financial businesses in which financial institutions are permitted to engage, a more rigorous investor-protection mechanism is also imposed upon Financial Investment Companies dealing in financial investment products. The Financial Investment Services and Capital Markets Act distinguishes general investors from sophisticated investors and provides new or enhanced protections to general investors. For instance, the Financial Investment Services and Capital Markets Act expressly provides for a strict know-your-customer rule for general investors and imposes an obligation that Financial Investment Companies should market financial investment products suitable to each general investor, using written explanatory materials. Under the Financial Investment Services and Capital Markets Act, a Financial Investment Company could be liable if a general investor proves (i) damage or losses relating to such general investor’s investment in financial investment products solicited by such Financial Investment Company and (ii) the absence of the requisite written explanatory materials, without having to prove fault or causation. With respect to any conflicts of interest between Financial Investment Companies and investors, the Financial Investment Services and Capital Markets Act expressly requires (i) disclosure of any conflict of interest to investors and (ii) mitigation of conflicts of interest to a comfortable level or abstention from the relevant transaction.

Other Changes to Securities / Fund Regulations

The Financial Investment Services and Capital Markets Act changed various securities regulations including those relating to public disclosure, insider trading and proxy contests, which were previously governed by the Korean Securities Exchange Act. For example, the 5% and 10% reporting obligations under the Korean

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Securities Exchange Act have become more stringent. The Indirect Investment and Asset Management Business Act strictly limited the kind of vehicles that could be utilized under a collective investment scheme, restricting the range of potential vehicles to trusts and corporations, and the type of funds that can be used for investments. However, under the Financial Investment Services and Capital Markets Act, these restrictions have been significantly liberalized, permitting all vehicles that may be created under Korean law, such as limited liability companies or partnerships, to be used for the purpose of collective investments and allowing investment funds to be more flexible as to their investments.

Act on the Corporate Governance of Financial Companies

The Act on the Corporate Governance of Financial Companies, which became effective on August 1, 2016, was enacted to address the need for strengthened regulations on corporate governance of financial institutions and to serve as a uniform set of regulations on corporate governance matters applicable to financial institutions across a variety of industry sectors. It contains several key measures, including (i) eligibility requirements for officers of financial institutions and standards for determining whether officers of financial institutions may hold concurrent positions in other companies, (ii) standards for composition and operation of the board of directors of financial institutions, (iii) standards for establishment, composition and operation of various committees of the board of directors of financial institutions, (iv) regulations on internal control and risk management, (v) requirements and procedures for the approval of a change of major shareholders and (vi) special regulations to protect the rights of minority shareholders of financial institutions.

Item 4.C. Organizational Structure

The following chart provides an overview of our structure, including our significant subsidiaries and our ownership of such subsidiaries as of the date of this annual report:

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We are the direct or indirect parent company of a number of subsidiaries. The following table provides summary information for our subsidiaries (other than structured companies) that are consolidated in our consolidated financial statements as of and for the year ended December 31, 2017:

Subsidiary	Percentage of Ownership			Total Assets		Shareholders’ Equity		Operating Revenue		Net Income
	(in millions of Won)
Woori Card Co., Ltd.		100.0	%	￦	8,605,993	￦	1,632,288	￦	1,771,157	￦	101,214
Woori Investment Bank Co., Ltd.		59.8	%		1,880,157		291,548		183,376		20,023
Woori FIS Co., Ltd.		100.0	%		103,932		32,546		252,460		1,940
Woori Finance Research Institute Co., Ltd.		100.0	%		3,790		3,441		4,733		83
Woori Credit Information Co., Ltd.		100.0	%		33,298		27,124		31,580		861
Woori Fund Service Co., Ltd.		100.0	%		12,653		11,411		9,021		1,398
Woori Private Equity Asset Management Co., Ltd.		100.0	%		42,894		40,225		7,257		(4,114	)
Korea BTL Infrastructure Fund.		99.9	%		786,480		786,180		30,240		26,390
Woori America Bank.		100.0	%		1,954,301		275,053		81,337		11,869
Woori Bank (China) Limited.		100.0	%		4,960,637		501,953		388,913		13,809
PT Bank Woori Saudara Indonesia 1906, Tbk		79.9	%		2,230,617		485,446		192,485		38,488
AO Woori Bank.		100.0	%		201,704		52,603		15,656		4,748
Banco Woori Bank do Brasil S.A.		100.0	%		213,889		32,346		20,455		1,843
Woori Global Market Asia Limited		100.0	%		290,226		111,884		11,345		1,922
Woori Finance Cambodia		100.0	%		51,304		18,431		5,895		983
Woori Finance Myanmar		100.0	%		18,236		12,929		2,506		791
Wealth Development Bank Corp.		51.0	%		191,049		34,240		13,632		1,323
Woori Bank Vietnam Limited		100.0	%		775,758		143,598		29,698		2,436

Item 4.D. Property, Plants and Equipment

Our registered office and corporate headquarters, with a total area of approximately 97,222 square meters, are located at 51, Sogong-ro, Jung-gu, Seoul, Korea. Information regarding certain of our properties in Korea as of December 31, 2017 is presented in the following table:

Type of Facility/Building	Location	Area
		(square meters)
Woori Bank registered office and corporate headquarters	51, Sogong-ro, Jung-gu, Seoul, Korea 04632		97,222
Woori FIS registered office and corporate headquarters	17, World Cup buk-ro 60-gil, Mapo-gu, Seoul, Korea 03921		37,442

As of December 31, 2017, we had a network of 876 banking branches in Korea, 233 of which are housed in buildings owned by us, while the remaining branches are leased properties. Lease terms are generally from two to three years and seldom exceed five years. We also have subsidiaries in the United States, China, Hong Kong, Russia, Indonesia, Cambodia, Brazil, Myanmar, the Philippines and Vietnam and branches, agencies and representative offices across the world. See “Item 4.B. Business Overview—Capital Markets Activities—International Banking.” We do not own any material properties outside of Korea.

The net book value of all the properties owned by us as of December 31, 2017 was ￦2,478 billion.

Item 4A. UNRESOLVED STAFF COMMENTS

We do not have any unresolved comments from the U.S. Securities and Exchange Commission staff regarding our periodic reports under the Exchange Act.

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Item 5. OPERATING AND FINANCIAL REVIEW AND PROSPECTS

Item 5.A. Operating Results

Overview

The following discussion is based on our consolidated financial statements, which have been prepared in accordance with IFRS as issued by the IASB. The consolidated financial statements include the accounts of subsidiaries over which substantive control is exercised through either majority ownership of voting stock and/or other means. Investments in joint ventures and associates (which are companies over which we have the ability to exercise significant influence) are accounted for by the equity method of accounting and are reported in investments in joint ventures and associates.

Trends in the Korean Economy

Our financial position and results of operations have been and will continue to be significantly affected by financial and economic conditions in Korea. Substantial growth in lending in Korea to small- and medium-sized enterprises in recent years, and financial difficulties experienced by such enterprises as a result of, among other things, adverse changes in economic conditions in Korea and globally, may lead to increasing delinquencies and a deterioration in overall asset quality in the credit exposures of Korean banks to small- and medium-sized enterprises. Our loans to small- and medium-sized enterprises increased from ￦68,434 billion as of December 31, 2016 to ￦74,906 billion as of December 31, 2017. In 2017, we recorded charge-offs of ￦325 billion in respect of our Won-denominated loans to small- and medium-sized enterprises, compared to charge-offs of ￦469 billion in 2016. See “Item 3.D. Risk Factors—Risks relating to our corporate credit portfolio—The largest portion of our exposure is to small- and medium-sized enterprises, and financial difficulties experienced by companies in this segment may result in a deterioration of our asset quality and have an adverse impact on us.”

In recent years, commercial banks, consumer finance companies and other financial institutions in Korea have also made significant investments and engaged in aggressive marketing in consumer lending (including mortgage and home equity loans), leading to substantially increased competition in this segment. In 2014 and 2015, the Korean government implemented several measures to encourage consumer spending and revive the housing market in Korea, including loosening regulations on mortgage lending, which contributed to an increase in our consumer loan portfolio. However, the Korean government introduced measures in the second half of 2016 and 2017 to tighten regulations on mortgage lending and housing subscription in response to the rapid growth in consumer debt and concerns over speculative investments in real estate in certain areas. Notwithstanding such measures, demand for residential property in certain areas, including Seoul, has continued to increase, and our consumer loan portfolio increased from ￦104,484 billion as of December 31, 2016 to ￦109,290 billion as of December 31, 2017. Nevertheless, a decrease in housing prices as a result of the implementation of such measures, together with the high level of consumer debt and rising interest rate levels, could result in declines in consumer spending and reduced economic growth, which may lead to increasing delinquencies and a deterioration in asset quality. In 2017, we recorded charge-offs of ￦147 billion and provisions for credit losses of ￦152 billion in respect of our consumer loan portfolio, compared to charge-offs of ￦155 billion and provisions for credit losses of ￦77 billion in 2016. See “Item 3.D. Risk Factors—Risks relating to our consumer credit portfolio.”

The Korean economy is closely tied to, and is affected by developments in, the global economy. The overall prospects for the Korean and global economy in 2018 and beyond remain uncertain. In recent years, the global financial markets have experienced significant volatility as a result of, among other things:

• the financial difficulties affecting many governments worldwide, in particular in Latin America and Europe;

• the slowdown of economic growth in China and other major emerging market economies;

• interest rate fluctuations as well as the possibility of further increases in policy rates by the U.S. Federal Reserve and other central banks; and

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• political and social instability in various countries in the Middle East, including Syria, Iraq and Egypt, as well as the referendum in the United Kingdom in June 2016, in which a majority of voters voted in favor of Brexit.

In light of the high level of interdependence of the global economy, unfavorable changes in the global financial markets, including as a result of any of the foregoing developments, could have a material adverse effect on the Korean economy and financial markets, and in turn on our business, financial condition and results of operations.

We are also exposed to adverse changes and volatility in the global and Korean financial markets as a result of our liabilities and assets denominated in foreign currencies and our holdings of trading and investment securities, including structured products. The value of the Won relative to major foreign currencies in general and the U.S. dollar in particular has fluctuated widely in recent years. See “Item 3.A. Selected Financial Data—Exchange Rates.” A depreciation of the Won will increase our cost of servicing our foreign currency-denominated debt, while continued exchange rate volatility may also result in foreign exchange losses for us. Furthermore, as a result of changing global and Korean economic conditions, there has been volatility in securities prices, including the stock prices of Korean and foreign companies in which we hold an interest. Such volatility has resulted in and may lead to further trading and valuation losses on our trading and investment securities portfolio as well as impairment losses on our investments in joint ventures and associates.

As a result of uncertain conditions in the Korean and global economies and financial markets, as well as factors such as fluctuations in oil and commodity prices, interest and exchange rate fluctuations, higher unemployment, lower consumer confidence, stock market volatility, potential tightening of fiscal and monetary policies and continued tensions with North Korea, the economic outlook for the financial services sector in Korea in 2018 and for the foreseeable future remains uncertain.

Changes in Securities Values, Exchange Rates and Interest Rates

Fluctuations of exchange rates, interest rates and stock prices affect, among other things, the demand for our products and services, the value of and rate of return on our assets, the availability and cost of funding and the financial condition of our customers. The following table shows, for the dates indicated, the stock price index of all equities listed on the KRX KOSPI Market as published in the KOSPI, the Won to U.S. dollar exchange rates and benchmark Won borrowing interest rates.

	June 30, 2013			Dec. 31, 2013			June 30, 2014			Dec. 31, 2014			June 30, 2015			Dec. 31, 2015			June 30, 2016			Dec. 31, 2016			June 30, 2017			Dec. 31, 2017
KOSPI		1,863.32			2,011.34			2,002.21			1,915.59			2,074.20			1,961.31			1,970.35			2,026.46			2,391.79			2,467.49
￦/US$ exchange rates(1)	￦	1,141.45		￦	1,055.25		￦	1,011.60		￦	1,090.89		￦	1,117.34		￦	1,169.26		￦	1,154.15		￦	1,203.73		￦	1,143.75		￦	1,067.42
Corporate bond rates(2)		3.5	%		3.6	%		3.4	%		2.8	%		2.5	%		2.6	%		2.3	%		2.8	%		2.8	%		3.1	%
Treasury bond rates(3)		2.9	%		2.8	%		2.6	%		2.1	%		1.8	%		1.7	%		1.3	%		1.6	%		1.7	%		2.1	%

⁽¹⁾  Represents the noon buying rate on the dates indicated.

⁽²⁾  Measured by the yield on three-year Korean corporate bonds rated as A+ by the Korean credit rating agencies.

⁽³⁾  Measured by the yield on three-year treasury bonds issued by the Ministry of Strategy and Finance of Korea.

Critical Accounting Policies

The notes to our consolidated financial statements contain a summary of our significant accounting policies, including a discussion of recently issued accounting pronouncements. Certain of these policies are critical to the portrayal of our financial condition, since they require management to make difficult, complex or subjective judgments, some of which may relate to matters that are inherently uncertain. We discuss these critical accounting policies below.

Impairment of Loans and Allowance for Credit Losses

We evaluate our loans and receivables portfolio for impairment on an ongoing basis. We have established an allowance for credit losses, which is available to absorb losses in our loans and receivables portfolio. If we believe that additions or changes to the allowance for credit losses are required, we record provisions for credit

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losses (as part of our impairment loss for credit loss), which are treated as charges against current income. Loan exposures that we deem to be uncollectible, including actual loan losses, net of recoveries of previously written-off amounts, are charged directly against the allowance for credit losses.

We have established our allowance for credit losses as of December 31, 2015, 2016 and 2017 in accordance with International Accounting Standard 39, Financial Instruments: Recognition and Measurement. IFRS 9 Financial Instruments is effective, and replaces International Accounting Standard 39, for annual periods commencing on or after January 1, 2018. See “Item 5.B. Liquidity and Capital Resources—Recent Accounting Pronouncements.”

International Accounting Standard 39

Our accounting policies under International Accounting Standard 39 for losses arising from the impairment of loans and receivables and our allowance for credit loss are described in Notes 2-(9)-6) and 3-(4) of the notes to our consolidated financial statements. We base the level of our allowance for credit losses on an evaluation of the risk characteristics of our loan portfolio. The evaluation considers factors such as historical loss experience, the financial condition of our borrowers and current economic conditions.

Our allowance for credit losses represents our management’s best estimate of losses incurred in the loans and receivables portfolio as of the date of the statement of financial position. Our management is required to exercise judgment in making assumptions and estimates when calculating the allowance for credit losses on both individually and collectively assessed loans and advances.

The determination of the allowance required for loans and receivables that are deemed to be individually significant often requires the use of considerable management judgment concerning such matters as economic conditions, the financial performance of the counterparty and the value of any collateral held for which there may not be a readily accessible market. Once we have identified loans and receivables as impaired, we generally value them based on the present value of expected future cash flows discounted at the original effective interest rate of the applicable loan or receivable and compare such present value against the carrying amount of such loan or receivable, which amount is subject to various estimates by our management such as the operating cash flow of the borrower, net realizable value of any collateral held and the timing of anticipated receipts. The actual amount of the future cash flows and their timing may differ from the estimates used by our management and consequently may cause actual losses to differ from the reported allowances.

The allowance for portfolios of smaller-balance homogenous loans and receivables, such as those to individuals and small business customers, and for those loans which are individually significant but for which no objective evidence of impairment exists, is determined on a collective basis. The collective allowance is calculated on a portfolio basis using statistical methodology based on our historical loss experience, which incorporates numerous estimates and judgments. We perform a regular review of the models and underlying data and assumptions.

Our consolidated financial statements for the year ended December 31, 2017 included a total allowance for credit losses of ￦1,830 billion as of that date. We recorded provisions for credit losses of ￦862 billion in 2017.

We believe that the accounting estimates related to impairment of loans and receivables and our allowance for credit losses are a “critical accounting policy” because: (1) they are highly susceptible to change from period to period because they require us to make assumptions about future default rates and losses relating to our loan portfolio; and (2) any significant difference between our estimated losses on loans and receivables (as reflected in our allowance for credit losses) and actual losses on loans and receivables could require us to record additional provisions for credit losses which, if significant, could have a material impact on our profit. Our assumptions about estimated losses require significant judgment because actual losses have fluctuated in the past and are expected to continue to do so, based on a variety of factors.

IFRS 9

IFRS 9 introduces a new impairment model which requires the calculation of allowance for credit losses based on expected credit losses instead of incurred credit losses (as is the case under International Accounting

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Standard 39) by assessing changes in expected credit losses and recognizing such changes as impairment loss (or reversal of impairment loss) in profit or loss. Under IFRS 9, the allowance required to be established with respect to a loan or receivable is the amount of the expected 12-month credit loss or the expected lifetime credit loss for the applicable loan or receivable, according to the three stages of credit risk deterioration since initial recognition, as follows:

• Stage 1 (loans and receivables for which credit risk has not significantly increased since initial recognition): the allowance for credit losses must cover expected credit losses due to possible defaults on the relevant loan or receivable within a 12-month period from the reporting date.

• Stage 2 (loans and receivables for which credit risk has significantly increased since initial recognition): the allowance for credit losses must cover expected credit losses from all possible defaults during the expected lifetime of the relevant loan or receivable.

• Stage 3 (credit-impaired loans and receivables): the allowance for credit losses must cover expected credit losses from all possible defaults during the expected lifetime of the relevant loan or receivable.

For further information regarding IFRS 9, see Note 2-(1)-2) of the notes to our consolidated financial statements.

We expect that the new model for calculating expected credit losses for loans and receivables under IFRS 9 will continue to require significant management judgment and estimates, regarding matters such as the significance of changes in credit risk since initial recognition and the amount of expected credit losses for our loans and receivables.

Valuation of Financial Assets and Liabilities

Our accounting policy for determining the fair value of financial assets and liabilities is described in Notes 2-(9)-5), 3-(3) and 11 of the notes to our consolidated financial statements.

The best evidence of fair value is a quoted price in an actively traded market. In the event that the market for a financial asset or liability is not active, a valuation technique is used. The majority of valuation techniques employ only observable market data and, as such, the reliability of the fair value measurement is high. However, certain financial instruments are valued on the basis of valuation techniques that feature one or more significant market inputs that are unobservable. Valuation techniques that rely to a greater extent on unobservable inputs require a higher level of management judgment to calculate a fair value than those based wholly on observable inputs.

Valuation techniques used to calculate fair values are discussed in Notes 2-(9)-5) and 11 of the notes to our consolidated financial statements. The main assumptions and estimates which our management considers when applying a model with valuation techniques are:

• The likelihood and expected timing of future cash flows on the instrument. These cash flows are usually governed by the terms of the instrument, although judgment may be required when the ability of the counterparty to service the instrument in accordance with the contractual terms is in doubt. Future cash flows may be sensitive to changes in market rates.

• Selecting an appropriate discount rate for the instrument. The determination of this rate is based on an assessment of what a market participant would regard as the appropriate spread of the rate for the instrument over the appropriate risk-free rate.

• Judgment to determine what model to use to calculate fair value in areas where the choice of valuation model is particularly subjective (for example, valuation of complex derivative products).

The financial instruments carried at fair value have been categorized under the three levels of the IFRS fair value hierarchy as follows:

• Level 1: Quoted prices in active markets for identical assets or liabilities.

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• Level 2: Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities.

• Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Fair value is a market-based measure considered from the perspective of a market participant. As such, even when market assumptions are not readily available, our own assumptions are intended to reflect those that market participants would use in pricing the asset or liability at the measurement date.

Our consolidated financial statements for the year ended December 31, 2017 included financial assets measured at fair value using a valuation technique of ￦17,622 billion, representing 82.9% of total financial assets measured at fair value, and financial liabilities measured at fair value using a valuation technique of ￦3,467 billion, representing 99.2% of total financial liabilities measured at fair value. As used herein, the fair value using a valuation technique means the fair value at Level 2 and Level 3 in the fair value hierarchy.

We believe that the accounting estimates related to the determination of the fair value of financial instruments are a “critical accounting policy” because: (1) they may be highly susceptible to change from period to period based on factors beyond our control; and (2) any significant difference between our estimate of the fair value of these financial instruments on any particular date and either their estimated fair value on a different date or the actual proceeds that we receive upon sale of these financial instruments could result in valuation losses or losses on disposal which may have a material impact on our profit. Our assumptions about the fair value of financial instruments we hold require significant judgment because actual valuations have fluctuated in the past and are expected to continue to do so, based on a variety of factors.

Deferred Tax Assets

Our accounting policy for the recognition of deferred tax assets is described in Notes 2-(22) and 3-(2) of the notes to our consolidated financial statements.

The recognition of deferred tax assets relies on an assessment of the probability and sufficiency of future taxable profits, future reversals of existing taxable temporary differences and ongoing tax planning strategies.

We recognize deferred tax assets and liabilities for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases, unused tax losses and unused tax credits. Deferred tax assets are recognized only to the extent it is probable that sufficient taxable profit will be available against which those deductible temporary differences, unused tax losses or unused tax credits can be utilized. This assessment requires significant management judgment and assumptions. In determining the amount of deferred tax assets, we use forecasted operating results, which are based on historical financial performance, approved business plans, including a review of the eligible carry-forward periods, available tax planning opportunities and other relevant considerations.

Our consolidated financial statements for the year ended December 31, 2017 included deferred tax assets and liabilities of ￦280 billion and ￦23 billion, respectively, as of that date.

We believe that the estimates related to our recognition and measurement of deferred tax assets are a “critical accounting policy” because: (1) they may be highly susceptible to change from period to period based on our assumptions regarding our future profitability; and (2) any significant difference between our estimates of future profits on any particular date and estimates of such future profits on a different date could result in an income tax expense or benefit which may have a material impact on our net income from period to period. Our assumptions about our future profitability require significant judgment and are inherently subjective.

Goodwill

Our accounting policy for goodwill is described in Notes 2-(13) and 3-(1) of the notes to our consolidated financial statements.

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Goodwill is recognized as the excess of (i) the sum of the consideration transferred and the amount of any non-controlling interest in the acquiree over (ii) the net of the acquisition-date fair value of the identifiable assets acquired and the liabilities assumed. If the net amount of the acquisition-date fair value of the identifiable assets acquired and the liabilities assumed exceeds the sum of the consideration transferred and the amount of any non-controlling interest in the acquiree, such excess is recognized as a gain as of the acquisition date.

Goodwill is not depreciated and is stated at cost less accumulated impairment losses. However, goodwill that forms part of the carrying amount of an investment in an associate or a joint venture is not separately recognized and an impairment loss recognized is not allocated to any asset, including goodwill, that forms part of the carrying amount of the investment in the associate or the joint venture.

The review of goodwill impairment reflects our management’s best estimate of the certain factors. For example:

• The future cash flows of the cash generating units, or CGUs, are sensitive to the cash flows projected for the periods for which detailed forecasts are available and to assumptions regarding the long-term pattern of sustainable cash flows thereafter. Forecasts are compared with actual performance and verifiable economic data, but they necessarily and appropriately reflect our management’s view of future business prospects at the time of the assessment.

• The rates used to discount future expected cash flows are based on the costs of capital assigned to individual CGUs and can have a significant effect on their valuation. The cost of capital percentage is generally derived from a Capital Asset Pricing Model, which incorporates inputs reflecting a number of financial and economic variables, including the risk-free interest rate in the country concerned and a premium for the inherent risk of the business being evaluated. These variables are subject to fluctuations in external market rates and economic conditions beyond our control and therefore require the exercise of significant judgment and are consequently subject to uncertainty.

A decline in a CGU’s expected cash flows or an increase in its cost of capital reduces the CGU’s estimated recoverable amount. If this is lower than the carrying value of the CGU, a charge for impairment of goodwill is recognized in the statement of comprehensive income for the year.

The accuracy of forecast cash flows is subject to a high degree of uncertainty in volatile market conditions. In such market conditions, our management retests goodwill for impairment more frequently than once a year to ensure that the assumptions on which the cash flow forecasts are based continue to reflect current market conditions and management’s best estimate of future business prospects.

Our consolidated financial statements for the year ended December 31, 2017 included the value of goodwill of ￦109 billion as of that date.

We believe that the accounting estimates related to the fair values of our acquired goodwill are a “critical accounting policy” because: (1) they may be highly susceptible to change from period to period since they require assumptions about future cash flows, run-off rates and profitability; and (2) any significant changes in our estimates from period to period could result in the recognition of impairment losses which may have a material impact on our net income. Our assumptions about estimated future cash flows, run-off rates and profitability require significant judgment and the fair values of the goodwill could fluctuate in the future, based on a variety of factors.

Defined Benefit Obligations

Our accounting policy for the recognition of defined benefit obligations is described in Notes 2-(21) and 3-(5) of the notes to our consolidated financial statements.

We operate both defined contribution and defined benefit pension plans for our employees. Contributions to the defined contribution plan are recognized as employee benefit expenses in the period in which an employee has rendered services entitling them to the contributions. For defined benefit pension plans, the cost of providing benefits is determined using the Projected Unit Credit Method, with actuarial valuations being carried out at the

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end of each reporting period. Remeasurement, which comprises actuarial gains and losses, the effect of the changes to the asset ceiling (if applicable) and the return on plan assets (excluding interest), is reflected immediately in our statement of financial position with a charge or credit recognized in other comprehensive income in the period in which it occurs.

Remeasurement recognized in other comprehensive income is reflected immediately in retained earnings and will not be reclassified to profit or loss. Past service cost is recognized in profit or loss in the period of a plan amendment. Net interest is calculated by applying the discount rate at the beginning of the period to the net defined benefit liability or asset. Defined benefit costs are composed of service cost (including current and past service costs, as well as gains and losses on curtailments and settlements), net interest expense (income) and remeasurement. We present the service cost and net interest expense (income) components in profit or loss, and the remeasurement component in other comprehensive income. Curtailment gains and losses are accounted for as past service costs.

The defined benefit obligations recognized in our consolidated statement of financial position represent the actual deficit or surplus in our defined benefit plans. Any surplus resulting from this calculation is limited to the present value of any economic benefits available in the form of refunds from the plans or reductions in future contributions to the plans. Liabilities for termination benefits are recognized at the earlier of either (i) when we are not able to cancel our proposal for termination benefits, or (ii) when we have recognized the cost of restructuring that accompanies the payment of termination benefits.

We believe that the estimates related to our recognition of defined benefit obligations are a “critical accounting policy” because: (1) they may be highly susceptible to change from period to period because they require us to make assumptions about discount rates, future wage growth rates, retirement rates and mortality rates; and (2) any significant remeasurement of net defined benefit obligations may have a material impact on our other comprehensive income and retained earnings. Our actuarial assumptions require significant judgment due to the complexities involved in the valuation of our defined benefit obligations and their long-term nature.

For an analysis of the sensitivity of our defined benefit obligations to changes in actuarial assumptions, see Note 24 of the notes to our consolidated financial statements.

Results of Operations

Net Interest Income

The following table shows, for the periods indicated, the principal components of our interest income:

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Interest income
Due from banks	￦	81		￦	75		￦	83			(7.4	)%		10.7	%
Loans		7,700			7,635			7,836			(0.8	)		2.6
Financial assets at fair value through profit or loss		63			63			53			—			(15.9	)
Investment financial assets(1)		808			700			548			(13.4	)		(21.7	)
Other receivables		46			39			31			(17.4	)		(18.4	)
Total interest income		8,698			8,512			8,551			(2.1	)		0.5
Interest expense
Deposits		2,888			2,547			2,380			(11.8	)		(6.6	)
Borrowings		217			215			238			(0.9	)		10.7
Debentures		708			619			639			(12.6	)		3.2
Others		123			111			73			(9.8	)		(34.2	)
Total interest expense		3,936			3,492			3,330			(11.3	)		(4.6	)
Net interest income	￦	4,762		￦	5,020		￦	5,221			5.4	%		4.0	%
Net interest margin(2)		1.74	%		1.71	%		1.74	%

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⁽¹⁾  Includes available-for-sale financial assets and held-to-maturity financial assets.

⁽²⁾  The ratio of net interest income to average interest-earning assets.

Comparison of 2017 to 2016

Interest income.  Interest income increased 0.5% from ￦8,512 billion in 2016 to ￦8,551 billion in 2017, primarily as a result of a 2.6% increase in interest on loans, which was partially offset by a 21.7% decrease in interest on investment financial assets. The average balance of our interest-earning assets increased 1.8% from ￦294,264 billion in 2016 to ￦299,691 billion in 2017, principally due to growth in our loan portfolio as well as financial assets portfolio. The effect of this increase was partially offset by a 4 basis point decrease in the average yield on our interest-earning assets from 2.89% in 2016 to 2.85% in 2017, which reflected a decrease in the general level of interest rates in Korea in 2017 compared to 2016.

The 2.6% increase in interest on loans from ￦7,635 billion in 2016 to ￦7,836 billion in 2017 was primarily due to:

• a 7.3% increase in the average volume of general purpose household loans from ￦61,918 billion in 2016 to ￦66,420 billion in 2017, which was enhanced by a 3 basis point increase in the average yield of such loans from 3.41% in 2016 to 3.44% in 2017; and

• a 5.6% increase in the average volume of mortgage loans from ￦45,007 billion in 2016 to ￦47,545 billion in 2017, which was enhanced by a 2 basis point increase in the average yield of such loans from 2.94% in 2016 to 2.96% in 2017.

The effect of the above increases was offset in part by a 2.9% decrease in the average volume of commercial and industrial loans from ￦98,202 billion in 2016 to ￦95,349 billion in 2017, which in turn was partially offset by a 1 basis point increase in the average yield on such loans from 3.28% in 2016 to 3.29% in 2017.

The increase in the average volume of general purpose household loans and mortgage loans was primarily due to increased demand for such loans among consumers in Korea. The average yields on general purpose household loans and mortgage loans increased mainly due to an increase in interest rates for loans in Korea commencing in the second half of 2017. The decrease in the average volume of commercial and industrial loans mainly reflected a decrease in loans to certain large corporate borrowers, primarily as a result of our efforts to decrease our exposure to such borrowers and diversify our loan portfolio.

Overall, the average volume of our loans increased 1.3% from ￦234,287 billion in 2016 to ￦237,340 billion in 2017, and the average yield on our loans increased 4 basis points, from 3.26% in 2016 to 3.30% in 2017.

Our financial assets portfolio consists primarily of investment financial assets, a majority of which comprises debt securities, including those issued by Korean financial institutions, corporations and government-owned or -controlled enterprises. The 21.9% decrease in interest on investment financial assets from ￦700 billion in 2016 to ￦548 billion in 2017 was primarily due to a 56 basis point decrease in the average yield on such assets from 2.23% in 2016 to 1.67% in 2017, which was partially offset by a 4.9% increase in the average balance of such assets from ￦31,348 billion in 2016 to ￦32,881 billion in 2017. The decrease in the average yield on investment financial assets resulted mainly from the decrease in the general level of interest rates in Korea in 2017 compared to 2016. The increase in the average balance of investment financial assets principally reflected an increase in the amount of financial institution bonds that we held as investment financial assets.

Interest expense.  Interest expense decreased 4.6% from ￦3,492 billion in 2016 to ￦3,330 billion in 2017, primarily due to a 6.6% decrease in interest expense on deposits. The average balance of interest-bearing liabilities increased 1.9% from ￦280,732 billion in 2016 to ￦286,164 billion in 2017, principally due to an increase in the average balance of deposits and debentures. The effect of this increase was more than offset by a decrease of 8 basis points in the average cost of interest-bearing liabilities from 1.24% in 2016 to 1.16% in 2017, which was driven mainly by a decrease in the average cost of debentures and deposits.

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The 6.6% decrease in interest expense on deposits from ￦2,547 billion in 2016 to ￦2,380 billion in 2017 resulted mainly from a 7.3% decrease in interest expense on Won-denominated time and savings deposits from ￦2,166 billion in 2016 to ￦2,008 billion in 2017. The decrease in interest expense on Won-denominated time and savings deposits was mainly due to a 12 basis point decrease in the average cost of such deposits from 1.20% in 2016 to 1.08% in 2017, which was partially offset by a 2.9% increase in the average balance of such deposits from ￦181,073 billion in 2016 to ￦186,277 billion in 2017. The decrease in the average cost of Won-denominated time and savings deposits was primarily attributable to the decrease in the general level of interest rates in Korea in 2017 compared to 2016, while the increase in the average volume of such deposits mainly reflected customers’ continuing preference for low-risk products and institutions in Korea in light of the continuing uncertainty in financial markets in 2017.

Overall, the average volume of our deposits increased 2.7% from ￦217,696 billion in 2016 to ￦223,593 billion in 2017, while the average cost of our deposits decreased 11 basis points from 1.17% in 2016 to 1.06% in 2017.

Interest expense on debentures increased 3.2% from ￦619 billion in 2016 to ￦639 billion in 2017, primarily due to a 12.5% increase in the average balance of debentures from ￦22,988 billion in 2016 to ￦25,865 billion in 2017, which was mainly attributable to our increased use of debentures to meet our funding needs. Such increase was partially offset by a 22 basis point decrease in the average cost of debentures from 2.69% in 2016 to 2.47% in 2017, which mainly reflected the lower interest rate environment in Korea in 2017 compared to 2016.

Net interest margin.  Net interest margin represents the ratio of net interest income to average interest-earning assets. Our overall net interest margin increased from 1.71% in 2016 to 1.74% in 2017, as a 4.0% increase in net interest income from ￦5,020 billion in 2016 to ￦5,221 billion in 2017 outpaced a 1.8% increase in the average balance of our interest-earning assets from ￦294,264 billion in 2016 to ￦299,691 billion in 2017. The effect of the increase in interest income was enhanced by a decrease in interest expense, resulting in an increase in net interest income, while the growth in average interest-earning assets was largely matched by a 1.9% increase in average interest-bearing liabilities from ￦280,732 billion in 2016 to ￦286,164 billion in 2017. The increase in net interest margin was driven mainly by an increase in our net interest spread, which represents the difference between the average yield on our interest-earning assets and the average cost of our interest-bearing liabilities, from 1.65% in 2016 to 1.69% in 2017. The increase in our net interest spread reflected a larger decrease in the average cost of our interest-bearing liabilities, compared to the decrease in the average yield on our interest-earning assets from 2016 to 2017, which was primarily attributable to the earlier adjustment of interest rates on interest-earning assets compared to interest rates on interest-bearing liabilities in the context of an increase in the general level of interest rates in Korea commencing in the second half of 2017.

Comparison of 2016 to 2015

Interest income.  Interest income decreased 2.1% from ￦8,698 billion in 2015 to ￦8,512 billion in 2016, primarily as a result of a 13.4% decrease in interest on investment financial assets, which was enhanced by a 0.8% decrease in interest on loans. The average balance of our interest-earning assets increased 7.7% from ￦273,275 billion in 2015 to ￦294,264 billion in 2016, principally due to the growth of our loan portfolio. The effect of this increase was more than offset by a 29 basis point decrease in the average yield on our interest-earning assets from 3.18% in 2015 to 2.89% in 2016, which reflected a decrease in the general level of interest rates in Korea in 2016 compared to 2015.

The 13.4% decrease in interest on investment financial assets from ￦808 billion in 2015 to ￦700 billion in 2016 was primarily due to a 51 basis point decrease in the average yield on such assets from 2.74% in 2015 to 2.23% in 2016, which was partially offset by a 6.2% increase in the average balance of such assets from ￦29,513 billion in 2015 to ￦31,348 billion in 2016. The decrease in the average yield on investment financial assets resulted mainly from the decrease in the general level of interest rates in Korea in 2016. The increase in the average balance of investment financial assets principally reflected an increase in the amount of financial institution bonds we held as investment financial assets.

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The 0.8% decrease in interest on loans from ￦7,700 billion in 2015 to ￦7,636 billion in 2016 was primarily due to a 40 basis point decrease in the average yield on commercial and industrial loans from 3.68% in 2015 to 3.28% in 2016, which was partially offset by a 3.1% increase in the average volume of such loans from ￦95,241 billion in 2015 to ￦98,202 billion in 2016. The effect of the such decrease was offset in part by a 29.4% increase in the average volume of mortgage loans from ￦34,770 billion in 2015 to ￦45,007 billion in 2016, which in turn was partially offset by a 26 basis point decrease in the average yield on such loans from 3.20% in 2015 to 2.94% in 2016.

The average yields on commercial and industrial loans and mortgage loans decreased mainly due to the decrease in the general level of interest rates in Korea in 2016. The increase in the average volume of commercial and industrial loans was primarily due to increased demand from corporate borrowers as well as our marketing efforts to increase our corporate lending. The increase in the average volume of mortgage loans mainly reflected increased demand for such loans from customers, primarily as a result of the decrease in the general level of interest rates in Korea in 2016.

Overall, the average volume of our loans increased 7.4% from ￦218,213 billion in 2015 to ￦234,287 billion in 2016, and the average yield on our loans decreased 27 basis points, from 3.53% in 2015 to 3.26% in 2016.

Interest expense.  Interest expense decreased 11.3% from ￦3,936 billion in 2015 to ￦3,492 billion in 2016, primarily due to an 11.8% decrease in interest expense on deposits, which was enhanced by a 12.6% decrease in interest expense on debentures. The average balance of interest-bearing liabilities increased 7.7% from ￦260,546 billion in 2015 to ￦280,732 billion in 2016, principally due to an increase in the average balance of deposits. The effect of this increase was more than offset by a decrease of 27 basis points in the average cost of interest-bearing liabilities from 1.51% in 2015 to 1.24% in 2016, which was driven mainly by a decrease in the average cost of deposits.

The 11.8% decrease in interest expense on deposits from ￦2,888 billion in 2015 to ￦2,547 billion in 2016 resulted mainly from a 15.8% decrease in interest expense on time and savings deposits from ￦2,573 billion in 2015 to ￦2,166 billion in 2016. The decrease in interest expense on time and savings deposits was mainly due to a 33 basis point decrease in the average cost of such deposits from 1.53% in 2015 to 1.20% in 2016, which was partially offset by a 7.6% increase in the average balance of such deposits from ￦168,212 billion in 2015 to ￦181,073 billion in 2016. The decrease in the average cost of time and savings deposits was primarily attributable to the decrease in the general level of interest rates in Korea in 2016, while the increase in the average volume of such deposits mainly reflected customers’ continuing preference for low-risk products and institutions in Korea in light of the continuing uncertainty in financial markets in 2016.

Overall, the average volume of our deposits increased 10.1% from ￦197,762 billion in 2015 to ￦217,696 billion in 2016, while the average cost of our deposits decreased 29 basis points from 1.46% in 2015 to 1.17% in 2016.

The 12.6% decrease in interest expense on debentures from ￦708 billion in 2015 to ￦619 billion in 2016 was primarily due to a 36 basis point decrease in the average cost of debentures from 3.05% in 2015 to 2.69% in 2016, mainly caused by the lower interest rate environment in Korea in 2016. Such decrease was further enhanced by a 1.1% decrease in the average balance of debentures from ￦23,232 billion in 2015 to ￦22,988 billion in 2016, mainly caused by a decrease in debentures in foreign currency due to the maturity in 2016 of a large amount of such previously issued debentures.

Net interest margin.  Our overall net interest margin decreased from 1.74% in 2015 to 1.71% in 2016, as a 7.7% increase in the average balance of our interest-earning assets from ￦273,275 billion in 2015 to ￦294,264 billion in 2016 outpaced a 5.4% increase in net interest income from ￦4,762 billion in 2015 to ￦5,020 billion in 2016. The growth in average interest-earning assets was matched by a 7.7% increase in average interest-bearing liabilities from ￦260,546 billion in 2015 to ￦280,732 billion in 2016, while the decrease in interest income was more than offset by the decrease in interest expense, resulting in an increase in net interest income. The decrease in net interest margin was driven mainly by a decrease in our net interest

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spread from 1.67% in 2015 to 1.65% in 2016. The decrease in our net interest spread reflected a larger decrease in the average yield on our interest-earning assets compared to the decrease in the average cost of our interest-bearing liabilities from 2015 to 2016, primarily due to the earlier adjustment of interest rates on interest-earning assets compared to interest rates on interest-bearing liabilities in the context of the lower interest rate environment in Korea in 2016.

Impairment Losses due to Credit Loss

Impairment losses due to credit loss include provisions for credit losses, provisions for guarantees and provisions for unused commitments, in each case net of reversal of provisions.

Comparison of 2017 to 2016

Our impairment losses due to credit loss decreased 5.9% from ￦834 billion in 2016 to ￦785 billion in 2017, primarily due to a 3.3% decrease in provisions for credit losses, net of reversal of provisions for credit losses, and a reversal of provisions for loan commitments.

The 3.3% decrease in provisions for credit losses from ￦891 billion in 2016 to ￦862 billion in 2017 was mainly attributable to a reversal of provisions primarily caused by debt-to-equity swaps of certain corporate bonds and changes in exchange rates, which was partially offset by an increase in provisions for credit losses on consumer loans.

Provisions for loan commitments changed from net provisions of ￦3 billion in 2016 to a net reversal of provisions of ￦22 billion in 2017, principally as a result of our efforts to eliminate undrawn loan commitments of corporate borrowers by monitoring the credit activity of such borrowers.

Comparison of 2016 to 2015

Our impairment losses due to credit loss decreased 13.7% from ￦966 billion in 2015 to ￦834 billion in 2016, primarily due to a 19.9% decrease in provisions for credit losses, net of reversal of provisions for credit losses, which was offset in part by a 57.1% decrease in reversal of provisions for guarantees.

The 19.9% decrease in provisions for credit losses from ￦1,112 billion in 2015 to ￦891 billion in 2016 was mainly attributable to our management’s efforts to improve the overall asset quality of our loan portfolio by increasing the proportion of loans with higher asset quality and strengthening credit review and monitoring procedures.

The 57.1% decrease in reversal of provisions for guarantees from ￦140 billion in 2015 to ￦60 billion in 2016 was mainly attributable to a significant reversal in 2015 of provisions for guarantees provided in respect of certain corporate customers, which was not repeated in 2016.

Allowance for Credit Losses

For information on our allowance for credit losses, see “—Critical Accounting Policies—Impairment of Loans and Allowance for Credit Losses” and “Item 4.B. Business Overview—Assets and Liabilities—Loan Portfolio—Allocation and Analysis of Allowances for Credit Losses.”

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Corporate Loans

The following table shows, for the periods indicated, certain information regarding our impaired corporate loans (including government loans and bank loans):

	As of December 31,
	2015			2016			2017
Impaired corporate loans as a percentage of total corporate loans		2.1	%		1.5	%		1.2	%
Allowance for credit losses for corporate loans as a percentage of total corporate loans		1.3			1.2			1.0
Allowance for credit losses for corporate loans as a percentage of impaired corporate loans		63.0			80.2			82.6
Net charge-offs of corporate loans as a percentage of total corporate loans		0.7			0.4			0.2

During 2017, impaired corporate loans, allowance for credit losses for corporate loans and net charge-offs, each as a percentage of total corporate loans, decreased due to an improvement in the overall credit quality of our corporate loans, as well as an increase in the total amount of our corporate loans from ￦125,643 billion as of December 31, 2016 to ￦136,676 billion as of December 31, 2017. However, allowance for credit losses for corporate loans as a percentage of impaired corporate loans increased during 2017, as a 9.5% decrease in allowance for credit losses for corporate loans from ￦1,528 billion as of December 31, 2016 to ￦1,383 billion as of December 31, 2017 was outpaced by a 13.6% decrease in impaired corporate loans from ￦1,905 billion as of December 31, 2016 to ￦1,646 billion as of December 31, 2017, which was mainly attributable to debt-to-equity conversions of such loans.

During 2016, impaired corporate loans, allowance for credit losses for corporate loans and net charge-offs, each as a percentage of total corporate loans, decreased due to an improvement in the overall credit quality of our corporate loans, notwithstanding a decrease in the total amount of our corporate loans from ￦127,622 billion as of December 31, 2015 to ￦125,643 billion as of December 31, 2016. However, allowance for credit losses for corporate loans as a percentage of impaired corporate loans increased during 2016, as a 10.1% decrease in allowance for credit losses for corporate loans from ￦1,700 billion as of December 31, 2015 to ￦1,528 billion as of December 31, 2016 was outpaced by a 29.4% decrease in impaired corporate loans from ￦2,697 billion as of December 31, 2015 to ￦1,905 billion as of December 31, 2016, which was mainly attributable to redemptions and debt-to-equity conversions of such loans.

Consumer Loans and Credit Card Balances

The following table shows, for the periods indicated, certain information regarding our impaired loans to the consumer sector, excluding credit card balances:

	As of December 31,
	2015			2016			2017
Impaired consumer loans as a percentage of total consumer loans		0.4	%		0.3	%		0.3	%
Allowance for credit losses for consumer loans as a percentage of total consumer loans		0.2			0.2			0.2
Allowance for credit losses for consumer loans as a percentage of impaired consumer loans		57.1			52.5			64.7
Net charge-offs of consumer loans as a percentage of total consumer loans		0.2			0.1			0.1

During 2017, impaired consumer loans, allowance for credit losses for consumer loans and net charge-offs of consumer loans, each as a percentage of total consumer loans, remained stable. However, allowance for credit losses for consumer loans as a percentage of impaired consumer loans increased, as the degree of overall impairment of our impaired consumer loans became more severe in 2017 compared to 2016, resulting in a 22.0% increase in the level of our allowance for credit losses for consumer loans from ￦168 billion as of December 31, 2016 to ￦205 billion as of December 31, 2017, which outpaced a 13.9% increase in impaired consumer loans from ￦303 billion as of December 31, 2016 to ￦345 billion as of December 31, 2017.

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During 2016, impaired consumer loans and net charge-offs of consumer loans, each as a percentage of total consumer loans, decreased mainly as a result of an improvement in the overall credit quality of our consumer loans by increasing the proportion of such loans extended to consumer borrowers with higher credit scores and strengthening credit review and monitoring procedures, which was enhanced by an increase in the total amount of our consumer loans from ￦93,448 billion as of December 31, 2015 to ￦104,484 billion as of December 31, 2016. Allowance for credit losses for consumer loans as a percentage of impaired consumer loans also decreased, as the degree of impairment of our impaired consumer loans was not as severe in 2016 compared to 2015. Allowance for credit losses for consumer loans as a percentage of total consumer loans remained stable.

The following table shows, for the periods indicated, certain information regarding our impaired credit card balances:

	As of December 31,
	2015			2016			2017
Impaired credit card balances as a percentage of total credit card balances(1)		2.4	%		2.3	%		2.2	%
Allowance for credit losses for credit card balances as a percentage of total credit card balances(1)		2.4			2.3			2.7
Allowance for credit losses for credit card balances as a percentage of impaired credit card balances(1)		101.4			102.0			102.2
Net charge-offs of credit card balances as a percentage of total credit card balances(1)		2.7			3.0			2.6

⁽¹⁾  Includes corporate credit card balances.

During 2017, impaired credit card balances and net charge-offs of credit card balances, each as a percentage of total credit card balances, decreased mainly as a result of an improvement in the overall credit quality of our credit card portfolio, which was enhanced by an increase in the total amount of our credit card balances from ￦6,674 billion as of December 31, 2016 to ￦6,827 billion as of December 31, 2017. However, allowance for credit losses for credit card balances as a percentage of impaired credit card balances and as a percentage of total credit card balances increased, as the degree of overall impairment of our impaired credit card balances became more severe in 2017 compared to 2016, resulting in an increase in the level of our allowance for credit losses for credit card balances from ￦155 billion as of December 31, 2016 to ￦182 billion as of December 31, 2017.

During 2016, impaired credit card balances and allowance for credit losses for credit card balances, each as a percentage of total credit card balances, decreased mainly as a result of an improvement in the overall credit quality of our credit card portfolio, which was enhanced by an increase in the total amount of our credit card balances from ￦6,099 billion as of December 31, 2015 to ￦6,674 billion as of December 31, 2016. However, allowance for credit losses for credit card balances as a percentage of impaired credit card balances remained relatively stable at 102.0% in 2016, compared to 101.4% in 2015.

Net Fees and Commissions Income

The following table shows, for the periods indicated, the components of our net fees and commissions income:

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Fees and commissions income	￦	1,757		￦	1,865		￦	2,069			6.1	%		10.9	%
Fees and commissions expense		(781	)		(928	)		(999	)		18.8			7.7
Total fees and commissions income, net	￦	976		￦	937		￦	1,070			(4.0	)%		14.2	%

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Comparison of 2017 to 2016

Our net fees and commissions income increased 14.2% from ￦937 billion in 2016 to ￦1,070 billion in 2017, as a 10.9% increase in fees and commissions income from ￦1,865 billion in 2016 to ￦2,069 billion in 2017 outpaced a 7.7% increase in fees and commissions expense from ￦928 billion in 2016 to ￦999 billion in 2017. The 10.9% increase in fees and commissions income was mainly the result of a 12.3% increase in credit card fees from ￦955 billion in 2016 to ￦1,072 billion in 2017, which primarily reflected an increase in the average volume of credit card receivables as well as an increase in credit card issuances. Such increase was enhanced by a 75.3% increase in other fee income from ￦93 billion in 2016 to ￦163 billion in 2017, which was primarily attributable to an increase in fee income from trust management services. The 7.7% increase in fees and commissions expense was principally due to an 8.8% increase in credit card commissions from ￦761 billion in 2016 to ￦828 billion in 2017, which mainly reflected the increase in the average volume of credit card receivables.

For further information regarding our net fees and commissions income, see Note 35 of the notes to our consolidated financial statements included elsewhere in this annual report.

Comparison of 2016 to 2015

Our net fees and commissions income decreased 4.0% from ￦976 billion in 2015 to ￦937 billion in 2016, as an 18.8% increase in fees and commissions expense from ￦781 billion in 2015 to ￦928 billion in 2016 outpaced a 6.1% increase in fees and commissions income from ￦1,757 billion in 2015 to ￦1,865 billion in 2016. The 18.8% increase in fees and commissions expense was primarily due to an 18.2% increase in credit card commissions from ￦644 billion in 2015 to ￦761 billion in 2016, which mainly reflected an increase in the average volume of credit card receivables as well as an increase in credit card issuances. The 6.1% increase in fees and commissions income was mainly the result of a 12.1% increase in credit card fees from ￦852 billion in 2015 to ￦955 billion in 2016, which primarily reflected the increase in the average volume of credit card receivables.

For further information regarding our net fees and commissions income, see Note 35 of the notes to our consolidated financial statements included elsewhere in this annual report.

Net Gain on Financial Assets

The following table shows, for the periods indicated, the components of our net gain on financial assets:

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Gain (loss) on financial assets at fair value through profit or loss, net	￦	240		￦	114		￦	(105	)		(52.5	)%		N/M	(2)
Gain (loss) on available-for-sale financial assets, net(1)		(3	)		(1	)		193			(66.7	)		N/M	(2)
Total net gain on financial assets	￦	237		￦	113		￦	88			(52.3	)%		(22.1	)%

⁽¹⁾  Includes impairment losses on available-for-sale financial assets of ￦135 billion in 2015, ￦50 billion in 2016 and ￦31 billion in 2017.

⁽²⁾  N/M = not meaningful.

Comparison of 2017 to 2016

Our net gain on financial assets decreased 22.1% from ￦113 billion in 2016 to ￦88 billion in 2017, primarily as a result of a change in net gain (loss) on financial assets at fair value through profit or loss from a net gain of ￦114 billion in 2016 to a net loss of ￦105 billion in 2017, which was partially offset by a change in net gain (loss) on available-for-sale financial assets from a net loss of ￦1 billion in 2016 to a net gain of ￦193 billion in 2017.

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The change in net gain (loss) on financial assets at fair value through profit or loss was principally due to a 96.8% decrease in gain on financial assets held for trading from ￦186 billion in 2016 to ￦6 billion in 2017, which was enhanced by 56.3% increase in net loss on financial assets designated at fair value through profit or loss from ￦71 billion in 2016 to ￦111 billion in 2017. The 96.8% decrease in gain on financial assets held for trading was primarily due to a change in net gain (loss) on currency derivatives from a net gain of ￦121 billion in 2016 to a net loss of ￦155 billion in 2017, which was partially offset by a 235.3% increase in gains on equity derivatives from ￦34 billion in 2016 to ￦114 billion in 2017.

The 56.3% increase in net loss on financial assets designated at fair value through profit or loss resulted mainly from a 47.4% increase in net loss on equity-linked securities from ￦76 billion in 2016 to ￦112 billion in 2017, which was primarily attributable to an increase in losses on investments in securities linked to certain indices. Such losses were offset in part through derivative transactions and fees and commissions income generated in connection therewith. For further information regarding our net gain (loss) on financial assets at fair value through profit or loss, see Note 37 of the notes to our consolidated financial statements included elsewhere in this annual report.

The change in net gain (loss) on available-for-sale financial assets was principally due to a more than four-fold increase in gains on transaction of such securities from ￦48 billion in 2016 to ￦224 billion in 2017. Such increase mainly reflected an increase in the number of such transactions in 2017 compared to 2016.

Unrealized gains and losses (other than impairment losses) on available-for-sale financial assets are recorded in our statement of financial position as part of accumulated other comprehensive income, under other equity. In 2017, we recognized a net loss on valuation of available-for-sale financial assets of ￦85 billion as part of other comprehensive income (loss) net of tax.

Comparison of 2016 to 2015

Our net gain on financial assets decreased 52.3% from ￦237 billion in 2015 to ￦113 billion in 2016, primarily as a result of a 52.5% decrease in net gain on financial assets at fair value through profit or loss from ￦240 billion in 2015 to ￦114 billion in 2016.

The 52.5% decrease in net gain on financial assets at fair value through profit or loss was principally due to a change in net gain (loss) on financial assets designated at fair value through profit or loss from a net gain of ￦69 billion in 2015 to a net loss of ￦71 billion in 2016. Such change in net gain (loss) on financial assets designated at fair value through profit or loss resulted mainly from a change in net gain (loss) on equity-linked securities from a net gain of ￦68 billion in 2015 to a net loss of ￦76 billion in 2016, which was primarily attributable to an increase in losses on investments in securities linked to certain foreign indices. For further information regarding our net gain (loss) on financial assets at fair value through profit or loss, see Note 37 of the notes to our consolidated financial statements included elsewhere in this annual report.

In 2016, we recognized a net gain on valuation of available-for-sale financial assets of ￦13 billion as part of other comprehensive income (loss) net of tax.

General and Administrative Expenses

The following table shows, for the periods indicated, the components of our general and administrative expenses:

	Year ended December 31,						Percentage change
	2015		2016		2017		2016/2015			2017/2016
	(in billions of Won)						(%)
Employee benefits	￦	1,853	￦	2,125	￦	2,324		14.7	%		9.4	%
Depreciation and amortization		237		248		184		4.6			(25.8	)
Other general and administrative expenses		1,061		1,105		1,023		4.1			(7.4	)
General and administrative expenses	￦	3,151	￦	3,478	￦	3,531		10.4	%		1.5	%

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Comparison of 2017 to 2016

Our general and administrative expenses increased 1.5% from ￦3,478 billion in 2016 to ￦3,531 billion in 2017, primarily as a result of a 9.4% increase in employee benefits from ￦2,125 billion in 2016 to ￦2,324 billion in 2017, which was partially offset by a 7.4% decrease in other general and administrative expenses from ￦1,105 billion in 2016 to ￦1,023 billion in 2017 and a 25.8% decrease in depreciation and amortization from ￦248 billion in 2016 to ￦184 billion in 2017. The 9.4% increase in employee benefits was principally due to a 67.6% increase in redundancy payments from ￦179 billion in 2016 to ￦300 billion in 2017, resulting mainly from the early retirement program we implemented in September 2017. Such increase was enhanced by a 19.9% increase in other short-term employee benefits from ￦467 billion in 2016 to ￦560 billion in 2017, which mainly reflected an increase in benefit levels for our employees. The 7.4% decrease in other general and administrative expenses was mainly due to an 18.8% decrease in service charges from ￦245 billion in 2016 to ￦199 billion in 2017, principally reflecting a decrease in the number of our banking branches, and a 32.9% decrease in miscellaneous other expenses from ￦70 billion in 2016 to ￦47 billion in 2017. The 25.8% decrease in depreciation and amortization was also mainly due to the decrease in the number of our banking branches.

For further information regarding our general and administrative expenses, see Note 40-(1) of the notes to our consolidated financial statements included elsewhere in this annual report.

Comparison of 2016 to 2015

Our general and administrative expenses increased 10.4% from ￦3,151 billion in 2015 to ￦3,478 billion in 2016, primarily as a result of a 14.7% increase in employee benefits from ￦1,853 billion in 2015 to ￦2,125 billion in 2016, which was enhanced by a 4.1% increase in other general and administrative expenses from ￦1,061 billion in 2015 to ￦1,105 billion in 2016. The 14.7% increase in employee benefits was principally due to a 145.2% increase in redundancy payments from ￦73 billion in 2015 to ￦179 billion in 2016, resulting mainly from our implementation of an early retirement program in April and December 2016. Such increase was enhanced by a 22.6% increase in other short-term employee benefits from ￦381 billion in 2015 to ￦467 billion in 2016 and a 4.8% increase in short-term employee salaries from ￦1,263 billion in 2015 to ￦1,323 billion in 2016, both of which mainly reflected increases in benefit levels and average wages of our employees. The 4.1% increase in other general and administrative expenses was mainly due to a 28.8% increase in advertising expense from ￦59 billion in 2015 to ￦76 billion in 2016, principally reflecting our increased marketing efforts, as well as a 5.4% increase in rent from ￦296 billion in 2015 to ￦312 billion in 2016.

For further information regarding our general and administrative expenses, see Note 40-(1) of the notes to our consolidated financial statements included elsewhere in this annual report.

Net Other Operating Expenses

The following table shows, for the periods indicated, the components of our net other operating expenses:

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Other operating income	￦	3,782		￦	5,208		￦	3,737			37.7	%		(28.2	)%
Other operating expenses		(4,392	)		(5,575	)		(3,768	)		26.9			(32.4	)
Total net other operating expenses	￦	(610	)	￦	(367	)	￦	(31	)		(39.8	)%		(91.6	)%

Comparison of 2017 to 2016

Our net other operating expenses decreased 91.6% from ￦367 billion in 2016 to ￦31 billion in 2017, primarily due to a 32.4% decrease in other operating expenses from ￦5,575 billion in 2016 to ￦3,768 billion in 2017, which was partially offset by a 28.2% decrease in other operating income from ￦5,208 billion in 2016 to ￦3,737 billion in 2017.

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Other operating income includes principally gains on transaction of foreign exchange, gains on disposal of loans and receivables, gains on fair value of hedged items and miscellaneous other operating income. The 28.2% decrease in other operating income was attributable mainly to a 29.2% decrease in gains on transaction of foreign exchange from ￦4,792 billion in 2016 to ￦3,391 billion in 2017. This decrease, which primarily reflected lower exchange rate volatility in 2017, was more than offset by a greater decrease in loss on transaction of foreign exchange, which is recorded as part of other operating expenses. On a net basis, our net gain on transaction of foreign exchange increased more than five-fold from ￦86 billion in 2016 to ￦504 billion in 2017. The decrease in gains on transaction of foreign exchange was enhanced by a 45.5% decrease in gains on fair value hedged items from ￦99 billion in 2016 to ￦54 billion in 2017, as well as a 23.2% decrease in other miscellaneous operating income from ￦112 billion in 2016 to ￦86 billion in 2017, which was primarily due to a 60.7% decrease in amounts receivable from other creditor financial institutions under the terms of borrower debt restructuring programs from ￦75 billion in 2016 to ￦29 billion in 2017.

Other operating expenses include principally losses on transaction of foreign exchange, deposit insurance premiums, contributions to miscellaneous funds, losses related to derivatives and miscellaneous other operating expenses. The 32.4% decrease in other operating expenses was primarily the result of a 38.7% decrease in loss on transaction of foreign exchange from ￦4,706 billion in 2016 to ￦2,887 billion in 2017, which mainly reflected lower exchange rate volatility in 2017. This decrease was partially offset by a decrease in gains on transaction of foreign exchange, which is recorded as part of other operating income as discussed above.

For further information regarding our net other operating expense, see Notes 40-(2) and (3) of the notes to our consolidated financial statements included elsewhere in this annual report.

Comparison of 2016 to 2015

Our net other operating expenses decreased 39.8% from ￦610 billion in 2015 to ￦367 billion in 2016, as the effect of a 26.9% increase in other operating expenses from ￦4,392 billion in 2015 to ￦5,575 billion in 2016 was more than offset by a 37.7% increase on other operating income from ￦3,782 billion in 2015 to ￦5,208 billion in 2016.

The 37.7% increase in other operating income was attributable mainly to a 43.0% increase in gains on transaction of foreign exchange from ￦3,352 billion in 2015 to ￦4,792 billion in 2016. This increase, which was principally due to higher exchange rate volatility in 2016, was partially offset by an increase in loss on transaction of foreign exchange, which is recorded as part of other operating expenses. On a net basis, our net gain (loss) on transaction of foreign exchange changed from a net loss of ￦78 billion in 2015 to a net gain of ￦86 billion in 2016. The increase in gains on transaction of foreign exchange was enhanced by a more than three-fold increase in gains on fair value hedged items from ￦25 billion in 2015 to ￦99 billion in 2016. Such increases were offset in part by a 100% decrease in gains on transaction of derivatives from ￦59 billion in 2015 to less than ￦1 billion in 2016, as well as a 29% decrease in miscellaneous other income from ￦159 billion in 2015 to ￦112 billion in 2016, which was primarily due to a decrease in amounts receivable from other creditor institutions under the terms of borrower debt restructuring programs from ￦137 billion in 2015 to ￦75 billion in 2016.

The 26.9% increase in other operating expenses was primarily the result of a 37.2% increase in loss on transaction of foreign exchange from ￦3,430 billion in 2015 to ￦4,706 billion in 2016, which mainly reflected higher exchange rate volatility during 2016. This increase was more than offset by an increase in gains on transaction of foreign exchange, which is recorded as part of other operating income as discussed above. The increase in loss on transaction of foreign exchange was enhanced by a more than four-fold increase in losses related to derivatives from ￦21 billion in 2015 to ￦99 billion in 2016. Such increases were offset in part by a 26.3% decrease in miscellaneous other operating expenses from ￦232 billion in 2015 to ￦171 billion in 2016, which was primarily due to a 29.7% decrease in amounts payable to other creditor financial institutions under the terms of borrower debt restructuring programs from ￦155 billion in 2015 to ￦109 billion in 2016, as well as a 100.0% decrease in losses on fair value hedged items from ￦57 billion in 2015 to less than ￦1 billion in 2016.

For further information regarding our net other operating expense, see Notes 40-(2) and (3) of the notes to our consolidated financial statements included elsewhere in this annual report.

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Share of Losses of Joint Ventures and Associates

Comparison of 2017 to 2016

Our share of losses of joint ventures and associates increased more than five-fold from ￦20 billion in 2016 to ￦101 billion in 2017. Such increase was primarily attributable to a significant increase in impairment losses from ￦1 billion in 2016 to ￦115 billion in 2017, which mainly reflected a ￦103 billion impairment loss we recorded in respect of our 14.2% equity interest in Kumho Tire Co., Inc. (which we had acquired in 2010 as a result of a debt-to-equity swap in connection with its workout), due to further deterioration in its financial condition in 2017. For further information regarding our investments in joint ventures and associates, see Note 13 of the notes to our consolidated financial statements included elsewhere in this annual report.

Comparison of 2016 to 2015

Our share of losses of joint ventures and associates decreased 72.1% from ￦70 billion in 2015 to ￦20 billion in 2016. Such decrease was primarily attributable to a significant decrease in impairment losses from ￦56 billion in 2015 to ￦1 billion in 2016, which mainly reflected impairment losses we had recorded in respect of our equity interests in Osung LST Co., Ltd. and Poonglim Industrial Co., Ltd. in 2015, which were not repeated in 2016. For further information regarding our investments in joint ventures and associates, see Note 13 of the notes to our consolidated financial statements included elsewhere in this annual report.

Other Net Non-operating Income (Loss)

The following table shows, for the periods indicated, the components of our other net non-operating income (loss):

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Other non-operating income	￦	273		￦	132		￦	84			(51.6	)%		(36.4	)%
Other non-operating expenses		(102	)		(133	)		(190	)		30.4			42.9
Total other net non-operating income (loss)	￦	171		￦	(1	)	￦	(106	)		N/M	(1)		N/M	(1)

⁽¹⁾  N/M = not meaningful.

Comparison of 2017 to 2016

Our net other net non-operating loss increased significantly from ￦1 billion in 2016 to ￦106 billion in 2017, as the effect of a 42.9% increase in other non-operating expenses from ￦133 billion in 2016 ￦190 billion in 2017 was enhanced by a 36.4% decrease in other non-operating income from ￦132 billion in 2016 to ￦84 billion in 2017.

Other non-operating income includes principally gains on disposal of investment in joint ventures and associates, gains on disposal of premises and equipment and other assets, rental income and miscellaneous other non-operating income. The 36.4% decrease in other non-operating income was attributable mainly to a 66.7% decrease in miscellaneous other non-operating income from ￦96 billion in 2016 to ￦32 billion in 2017, which was partially offset by a 73.9% increase in gains on disposal of investment in joint ventures and associates from ￦23 billion in 2016 to ￦40 billion in 2017. The increase in gains on disposal of investment in joint ventures and associates was primarily attributable to an increase in the number of such transactions in 2017 compared to 2016.

Other non-operating expenses include principally donations, depreciation on investment properties, losses on disposal of investment in joint ventures and associates and miscellaneous other non-operating expenses. The 42.9% increase in other non-operating expenses was attributable mainly to a 122.7% increase in donations from ￦44 billion in 2016 to ￦98 billion in 2017 and a 160.0% increase in losses on disposal of investment in joint ventures and associates from ￦15 billion in 2016 to ￦39 billion in 2017, which were partially offset by a 35.6% decrease in miscellaneous other non-operating expenses from ￦59 billion in 2016 to ￦38 billion in 2017. The

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increase in donations mainly reflected our donation of issuance fees of dormant cashier’s checks for the past five years to the Korea Inclusive Finance Agency in accordance with the amended Microfinance Support Act. The increase in losses on disposal of investment in joint ventures and associates was primarily attributable to an increase in the number of such transactions in 2017 compared to 2016.

Comparison of 2016 to 2015

Our net other net non-operating income (loss) changed from net income of ￦171 billion in 2015 to a net loss of ￦1 billion in 2016, as the effect of a 51.6% decrease in other non-operating income from ￦273 billion in 2015 to ￦132 billion in 2016 was enhanced by a 30.4% increase in other non-operating expenses from ￦102 billion in 2015 to ￦133 billion in 2016.

The 51.6% decrease in other non-operating income was attributable mainly to a 50.8% decrease in miscellaneous other non-operating income from ￦195 billion in 2015 to ￦96 billion in 2016, which was enhanced by a 62.9% decrease in gains on disposal of investment in joint ventures and associates from ￦62 billion in 2015 to ￦23 billion in 2016. The decrease in miscellaneous other non-operating income mainly reflected a gain of ￦133 billion recognized in 2015 as a result of a judgment in favor of us and the other plaintiffs in a lawsuit against member companies of the Samsung Group for payment of guarantees they had provided to the plaintiffs in respect of certain obligations of Samsung Motors, a former affiliate, which was not repeated in 2016. The decrease in gains on disposal of investment in joint ventures and associates was attributable mainly to the recognition of negative goodwill in connection with our conversion of certain convertible bonds held as investment assets in 2015, which was not repeated to the same degree in 2016.

The 30.4% increase in other non-operating expenses was attributable mainly to an increase in losses on disposal of investment in joint ventures and associates from less than ￦1 billion in 2015 to ￦15 billion in 2016 and a 28.3% increase in miscellaneous other non-operating expenses from ￦46 billion in 2015 to ￦59 billion in 2016.

Income Tax Expense

Our income tax expense is calculated by adding or subtracting changes in deferred income tax liabilities and assets to income tax amounts payable for the period. Deferred tax assets are recognized for deductible temporary differences, including operating losses and tax credit carry-forwards, while deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are those between the carrying values of assets and liabilities for financial reporting purposes and their tax bases. Deferred tax assets, including the carry-forwards of unused tax losses, are recognized to the extent it is probable that the deferred tax assets will be realized.

Comparison of 2017 to 2016

Income tax expense increased 51.8% from ￦276 billion in 2016 to ￦419 billion in 2017, mainly as a result of an increase in our net income before income tax expense, the effect of which was enhanced by decreases in non-exempt income and tax adjustments recognized in respect of prior periods. The statutory tax rate was 24.2% for pre-tax income over ￦20 billion in 2016 and 2017. Our effective tax rate was 17.8% in 2016 and 21.5% in 2017. See Note 42 of the notes to our consolidated financial statements included elsewhere in this annual report.

Comparison of 2016 to 2015

Income tax expense decreased 26.8% from ￦377 billion in 2015 to ￦276 billion in 2016 despite a 7.0% increase in our net income before income tax expense from ￦1,452 billion in 2015 to ￦1,553 billion in 2016. The decrease in income tax expense resulted primarily from a change in other miscellaneous tax adjustments from a net expense of ￦59 billion in 2015 to a net benefit of ￦16 billion in 2016, which was attributable mainly to a decrease in foreign withholding tax payments, as well as a decrease in non-deductible expenses. The statutory tax rate was 24.2% for pre-tax income over ￦20 billion in 2015 and 2016. Our effective tax rate was 25.9% in 2015 and 17.8% in 2016. See Note 42 of the notes to our consolidated financial statements included elsewhere in this annual report.

127

Net Income

Due to the factors described above, we recorded net income of ￦1,530 billion in 2017, compared to ￦1,277 billion in 2016 and ￦1,075 billion in 2015.

Results by Principal Business Segment

We compile and analyze financial information for our business segments based upon segment information used by our management for the purposes of resource allocation and performance evaluation. We currently have six operational business segments: consumer banking, corporate banking, investment banking, capital markets, credit card and other operations.

The following table shows, for the periods indicated, our results of operations by segment:

	Net income Year ended December 31,							Total operating income(1) Year ended December 31,
	2015		2016			2017		2015		2016		2017
	(in billions of Won)
Consumer banking	￦	26	￦	99		￦	264	￦	54	￦	166	￦	446
Corporate banking		317		610			918		418		815		1,217
Investment banking		165		84			106		174		65		100
Capital markets		11		(3	)		92		15		1		122
Credit card		117		109			101		155		144		138
Other operations		552		514			22		551		441		73
Total(2)	￦	1,188	￦	1,413		￦	1,503	￦	1,367	￦	1,632	￦	2,096

⁽¹⁾  Comprises net interest income, net non-interest income, administrative expenses and impairment losses due to credit losses.

⁽²⁾  Before adjustments for inter-segment transactions (other than inter-segment loans and borrowings) and certain differences in classification under our management reporting system.

128

Consumer Banking

This segment consists of our consumer banking operations. The following table shows, for the periods indicated, our income statement data for this segment:

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Income statement data
Interest income	￦	2,851		￦	2,980		￦	3,150			4.5	%		5.7	%
Interest expense		(1,228	)		(1,024	)		(956	)		(16.6	)		(6.6	)
Inter-segment		(334	)		(472	)		(491	)		41.3			4.0
Net interest income		1,289			1,484			1,703			15.1			14.8
Non-interest income		886			924			802			4.3			(13.2	)
Non-interest expense		(353	)		(406	)		(254	)		15.0			(37.4	)
Inter-segment		22			39			102			77.3			161.5
Net non-interest income		555			557			650			0.4			16.7
Administrative expenses		(1,782	)		(1,788	)		(1,809	)		0.3			1.2
Impairment losses due to credit loss and others(1)		(8	)		(87	)		(98	)		987.5			12.6
Total other expenses		(1,790	)		(1,875	)		(1,907	)		4.7			1.7
Operating income		54			166			446			207.4			168.7
Net non-operating loss		(19	)		(35	)		(98	)		84.2			180.0
Net income before tax		35			131			348			274.3			165.6
Income tax expense		(9	)		(32	)		(84	)		255.6			162.5
Net income	￦	26		￦	99		￦	264			280.8	%		166.7	%

⁽¹⁾  Consist of impairment losses due to credit loss, gain (loss) on loan sales and provisions (reversal of provisions).

Comparison of 2017 to 2016

Our net income before tax for this segment increased 165.6% from ￦131 billion in 2016 to ￦348 billion in 2017. Net income after tax also increased 166.7% from ￦99 billion in 2016 to ￦264 billion in 2017.

Interest income for this segment increased 5.7% from ￦2,980 billion in 2016 to ￦3,150 billion in 2017, primarily due to an increase in the average balances of general purpose household loans (including home equity loans) and mortgage loans, mainly reflecting increased demand for such loans among consumers, which was enhanced by a slight increase in the average yields on such loans, principally as a result of an increase in interest rates for loans in Korea commencing in the second half of 2017.

Interest expense attributable to this segment decreased 6.6% from ￦1,024 billion in 2016 to ￦956 billion in 2017. The decrease in interest expense was primarily due to a decrease in the average cost of time and savings deposits held by consumers, which was mainly attributable to the decrease in the general level of interest rates in Korea in 2017 compared to 2016.

Net interest expense from inter-segment transactions for this segment increased 4.0% from ￦472 billion in 2016 to ￦491 billion in 2017, principally as a result of increased funding needs for this segment in light of the increase in the average volumes of general purpose household loans (including home equity loans) and mortgage loans.

Impairment losses due to credit loss and others for this segment increased 12.6% from ￦87 billion in 2016 to ￦98 billion in 2017, primarily as a result of an increase in provisions for general purpose household loans (including home equity loans) and mortgage loans, mainly reflecting the increase in the outstanding balances of such loans.

129

Non-interest income attributable to this segment decreased 13.2% from ￦924 billion in 2016 to ￦802 billion in 2017, primarily due to a decrease in gains on transaction of foreign exchange.

Non-interest expense for this segment decreased 37.4% from ￦406 billion in 2016 to ￦254 billion in 2017, primarily as a result of a decrease in losses on transaction of foreign exchange.

Net non-interest income from inter-segment transactions for this segment increased 161.5% from ￦39 billion in 2016 to ￦102 billion in 2017, principally as a result of an increase in fee income from our asset management products, including mutual funds, money trust products and bancassurance products.

Administrative expenses attributable to this segment increased 1.2% from ￦1,788 billion in 2016 to ￦1,809 billion in 2017, primarily due to an increase in benefit levels for our employees in this segment.

Comparison of 2016 to 2015

Our net income before tax for this segment increased 274.3% from ￦35 billion in 2015 to ￦131 billion in 2016. Net income after tax also increased 280.8% from ￦26 billion in 2015 to ￦99 billion in 2016.

Interest income for this segment increased 4.5% from ￦2,851 billion in 2015 to ￦2,980 billion in 2016, primarily due to an increase in the average balance of mortgage loans, mainly reflecting increased demand for such loans, which was partially offset by a decrease in the average yield on such loans. The effect of such increase in the average balance of mortgage loans was also offset in part by a decrease in the average yield on general purpose household loans (including home equity loans), mainly reflecting the decrease in the general level of interest rates in Korea in 2016, which in turn was partially offset by an increase in the average balance of such loans.

Interest expense attributable to this segment decreased 16.6% from ￦1,228 billion in 2015 to ￦1,024 billion in 2016. The decrease in interest expense was primarily due to a decrease in the average cost of time and savings deposits held by consumers, which was mainly attributable to the decrease in the general level of interest rates in Korea in 2016.

Net interest expense from inter-segment transactions for this segment increased 41.3% from ￦334 billion in 2015 to ￦472 billion in 2016, principally as a result of increased funding needs for this segment in light of the increase in the average volumes of mortgage loans and general purpose household loans (including home equity loans).

Impairment losses due to credit loss and others for this segment increased more than 10-fold from ￦8 billion in 2015 to ￦87 billion in 2016, primarily as a result of a significant increase in provisions for customer reward credits due to the release of our new mobile financial service platform.

Non-interest income attributable to this segment increased 4.3% from ￦886 billion in 2015 to ￦924 billion in 2016, primarily due to an increase in gains on transaction of foreign exchange.

Non-interest expense for this segment increased 15.0% from ￦353 billion in 2015 to ￦406 billion in 2016, primarily as a result of an increase in losses on transaction of foreign exchange.

Net non-interest income from inter-segment transactions for this segment increased 77.3% from ￦22 billion in 2015 to ￦39 billion in 2016, principally as a result of an increase in fee income from trust management services.

Administrative expenses attributable to this segment increased 0.3% from ￦1,782 billion in 2015 to ￦1,788 billion in 2016, primarily due to an increase in salaries attributable mainly to higher average wages paid to our employees in this segment, which more than offset a decrease in the number of employees in this segment caused by a branch reorganization.

130

Corporate Banking

This segment consists of our corporate banking (including small- and medium-sized enterprise banking and large corporate banking) operations. The following table shows, for the periods indicated, our income statement data for this segment:

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Income statement data
Interest income	￦	3,256		￦	3,026		￦	2,965			(7.1	)%		(2.0	)%
Interest expense		(1,880	)		(1,781	)		(1,682	)		(5.3	)		(5.6	)
Inter-segment		324			496			512			53.1			3.2
Net interest income		1,700			1,741			1,795			2.4			3.1
Non-interest income		503			535			681			6.4			27.3
Non-interest expense		(26	)		(33	)		(170	)		26.9			415.2
Inter-segment		37			48			60			29.7			25.0
Net non-interest income		514			550			571			7.0			3.8
Administrative expenses		(926	)		(967	)		(832	)		4.4			(14.0	)
Impairment losses due to credit loss and others(1)		(870	)		(509	)		(317	)		(41.5	)		(37.7	)
Total other expenses		(1,796	)		(1,476	)		(1,149	)		(17.8	)		(22.2	)
Operating income		418			815			1,217			95.0			49.3
Net non-operating loss		(2	)		(1	)		(3	)		(50.0	)		200.0
Net income before tax		416			814			1,214			95.7			49.1
Income tax expense		(99	)		(204	)		(296	)		106.1			45.1
Net income	￦	317		￦	610		￦	918			92.4	%		50.5	%

⁽¹⁾  Consist of impairment losses due to credit loss, gain (loss) on loan sales and provisions (reversal of provisions).

Comparison of 2017 to 2016

Our net income before tax for this segment increased 49.1% from ￦814 billion in 2016 to ￦1,214 billion in 2017. Net income after tax also increased 50.5% from ￦610 billion in 2016 to ￦918 billion in 2017.

Interest income for this segment decreased 2.0% from ￦3,026 billion in 2016 to ￦2,965 billion in 2017, primarily due to a decrease in the average balances of commercial and industrial and other commercial loans, mainly reflecting a decrease in loans to certain large corporate borrowers, principally as a result of our efforts to decrease our exposure to such borrowers and diversify our loan portfolio, which was partially offset by a slight increase in the average yields on such loans.

Interest expense attributable to this segment, which consists mainly of interest expense on corporate deposits, borrowings and debentures, decreased 5.6% from ￦1,781 billion in 2016 to ￦1,682 billion in 2017. The decrease in interest expense was primarily due to a decrease in the average cost of time and savings deposits held by corporate customers, mainly attributable to the decrease in the general level of interest rates in Korea in 2017 compared to 2016.

Net interest income from inter-segment transactions for this segment increased 3.2% from ￦496 billion in 2016 to ￦512 billion in 2017, principally as a result of an increase in the average balance of loans to other segments, which mainly reflected increased funding needs of the consumer banking segment.

Impairment losses due to credit loss and others for this segment decreased 37.7% from ￦509 billion in 2016 to ￦317 billion in 2017, primarily as a result of a decrease in provisions for corporate loans, mainly reflecting an overall improvement in the asset quality of our corporate loan portfolio.

131

Non-interest income attributable to this segment increased 27.3% from ￦535 billion in 2016 to ￦681 billion in 2017, primarily due to an increase in gains on transaction of derivatives.

Non-interest expense for this segment increased more than five-fold from ￦33 billion in 2016 to ￦170 billion in 2017, primarily as a result of an increase in losses on transaction of derivatives.

Administrative expenses attributable to this segment decreased 14.0% from ￦967 billion in 2016 to ￦832 billion in 2017, primarily due to increased efficiency from the consolidation of corporate banking branches with consumer banking branches, which was reflected in this segment.

Comparison of 2016 to 2015

Our net income before tax for this segment increased 95.7% from ￦416 billion in 2015 to ￦814 billion in 2016. Net income after tax also increased 92.4% from ￦317 billion in 2015 to ￦610 billion in 2016.

Interest income for this segment decreased 7.1% from ￦3,256 billion in 2015 to ￦3,026 billion in 2016, primarily due to a decrease in average yields on commercial and industrial and other commercial loans, mainly reflecting the decrease in the general level of interest rates in Korea in 2016, the effect of which was partially offset by an increase in the average balance of commercial and industrial loans.

Interest expense attributable to this segment decreased 5.3% from ￦1,880 billion in 2015 to ￦1,781 billion in 2016. The decrease in interest expense was primarily due to a decrease in the average cost of time and savings deposits held by corporate customers, which was enhanced by a decrease in the average cost of corporate debentures, all of which were mainly attributable to the decrease in the general level of interest rates in Korea in 2016.

Net interest income from inter-segment transactions for this segment increased 53.1% from ￦324 billion in 2015 to ￦496 billion in 2016, principally as a result of an increase in the average balance of loans to other segments, which mainly reflected increased funding needs of the consumer banking segment.

Impairment losses due to credit loss and others for this segment decreased 41.5% from ￦870 billion in 2015 to ￦509 billion in 2016, primarily as a result of a decrease in provisions for corporate loans, mainly reflecting an overall improvement in the asset quality of our corporate loan portfolio.

Non-interest income attributable to this segment increased 6.4% from ￦503 billion in 2015 to ￦535 billion in 2016, primarily due to an increase in gains on transaction of foreign exchange.

Non-interest expense for this segment increased 26.9 % from ￦26 billion in 2015 to ￦33 billion in 2016, primarily as a result of an increase in losses on transaction of foreign exchange.

Administrative expenses attributable to this segment increased 4.4% from ￦926 billion in 2015 to ￦967 billion in 2016, primarily due to an increase in salaries attributable mainly to growth in the number of employees in this segment.

132

Investment Banking

This segment consists of our investment banking operations, including principally project finance, structured finance, merger and acquisition financing and financial advisory services. The following table shows, for the periods indicated, our income statement data for this segment:

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Income statement data
Interest income	￦	155		￦	153		￦	148			(1.3	)%		(3.3	)%
Interest expense		—			—			—			—			—
Inter-segment		(149	)		(138	)		(136	)		(7.4	)		(1.4	)
Net interest income		6			15			12			150.0			(20.0	)
Non-interest income		490			605			367			23.5			(39.3	)
Non-interest expense		(375	)		(444	)		(215	)		18.4			(51.6	)
Inter-segment		—			—			—			—			—
Net non-interest income		115			161			152			40.0			(5.6	)
Administrative expenses		(15	)		(15	)		(13	)		—			(13.3	)
Impairment losses due to credit loss and others(1)		68			(96	)		(51	)		N/M	(2)		(46.9	)
Total other income (expenses)		53			(111	)		(64	)		N/M	(2)		(42.3	)
Operating income (loss)		174			65			100			(62.6	)		53.8
Net non-operating income		44			46			39			4.5			(15.2	)
Net income (loss) before tax		218			111			139			(49.1	)		25.2
Income tax benefit (expense)		(53	)		(27	)		(33	)		(49.1	)		22.2
Net income (loss)	￦	165		￦	84			￦106			(49.1	)%		26.2	%

⁽¹⁾  Consist of impairment losses due to credit loss, gain (loss) on loan sales and provisions (reversal of provisions).

⁽²⁾  N/M = not meaningful.

Comparison of 2017 to 2016

Our net income before tax for this segment increased 25.2% from ￦111 billion in 2016 to ￦139 billion in 2017. Net income after tax also increased 26.2% from ￦84 billion in 2016 to ￦106 billion in 2017.

Interest income for this segment, which consists mainly of interest income from financing provided to corporations, decreased 3.3% from ￦153 billion in 2016 to ￦148 billion in 2017, primarily reflecting the decrease in the general level of interest rates in Korea in 2017 compared to 2016.

Net interest expense on inter-segment transactions for this segment decreased 1.4% from ￦138 billion in 2016 to ￦136 billion in 2017, principally as a result of a decrease in the average cost of borrowings from other segments, which mainly reflected the lower interest rate environment in Korea.

Impairment losses due to credit loss and others for this segment decreased 46.9% from ￦96 billion in 2016 to ￦51 billion in 2017, primarily as a result of an improvement in the overall asset quality of our financing portfolio.

Non-interest income attributable to this segment decreased 39.3% from ￦605 billion in 2016 to ￦367 billion in 2017, primarily due to a decrease in gains on transaction of foreign exchange.

Non-interest expense for this segment decreased 51.6% from ￦444 billion in 2016 to ￦215 billion in 2017, primarily as a result of a decrease in losses on transaction of foreign exchange.

133

Administrative expenses attributable to this segment decreased 13.3% from ￦15 billion in 2016 to ￦13 billion in 2017, primarily due to increased efficiency in the use of our sales channels.

Comparison of 2016 to 2015

Our net income before tax for this segment decreased 49.1% from ￦218 billion in 2015 to ￦111 billion in 2016. Net income after tax also decreased 49.1% from ￦165 billion in 2015 to ￦84 billion in 2016.

Interest income for this segment decreased 1.3% from ￦155 billion in 2015 to ￦153 billion in 2016, mainly reflecting the decrease in the general level of interest rates in Korea in 2016.

Net interest expense on inter-segment transactions for this segment decreased 7.4% from ￦149 billion in 2015 to ￦138 billion in 2016, principally as a result of a decrease in the average cost of borrowings from other segments, which mainly reflected the decrease in the general level of interest rates in Korea in 2016.

Impairment losses due to credit loss and others for this segment changed from a net reversal of ￦68 billion in 2015 to net loss of ￦96 billion in 2016, primarily as a result of an increase in provisions for credit losses with respect to financing provided to a certain corporate customer, as well as reversals of provisions for credit losses in 2015 which were not repeated in 2016.

Non-interest income attributable to this segment increased 23.5% from ￦490 billion in 2015 to ￦605 billion in 2016, primarily due to an increase in gains on transaction of foreign exchange.

Non-interest expense for this segment increased 18.4% from ￦375 billion in 2015 to ￦444 billion in 2016, primarily as a result of an increase in losses on transaction of foreign exchange.

Administrative expenses attributable to this segment remained stable at ￦15 billion in 2015 and 2016.

Capital Markets

This segment consists of our core capital markets operations, including principally securities investment and trading of securities (other than available-for-sale securities), foreign exchange and derivatives. The following table shows, for the periods indicated, our income statement data for this segment:

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Income statement data
Interest income	￦	19		￦	19		￦	19			—	%		—	%
Interest expense		—			—			—			—			—
Inter-segment		22			30			18			36.4			(40.0	)
Net interest income		41			49			37			19.5			(24.5	)
Non-interest income		5,761			7,590			9,548			31.7			25.8
Non-interest expense		(5,743	)		(7,586	)		(9,478	)		32.1			24.9
Inter-segment		—			—			—			—			—
Net non-interest expense		18			4			70			(77.8	)		(1650.0	)
Administrative expenses		(17	)		(18	)		(16	)		5.9			(11.1	)
Impairment losses due to credit loss and others(1)		(27	)		(34	)		31			25.9			(191.2	)
Total other expenses		(44	)		(52	)		15			18.2			(128.8	)
Operating income (loss)		15			1			122			(93.3	)		N/M	(2)
Net non-operating income (loss)		—			(5	)		—			N/M	(2)		N/M	(2)
Net income (loss) before tax		15			(4	)		122			N/M	(2)		N/M	(2)
Income tax expense		(4	)		1			(30	)		N/M	(2)		N/M	(2)
Net income (loss)	￦	11		￦	(3	)	￦	92			N/M	(2)		N/M	(2)

134

⁽¹⁾  Consist of impairment losses due to credit loss, gain (loss) on loan sales and provisions (reversal of provisions).

⁽²⁾  N/M = not meaningful.

Comparison of 2017 to 2016

Our net income (loss) before tax for this segment changed from a net loss of ￦4 billion in 2016 to a net gain of ￦122 billion in 2017. Net income (loss) after tax also changed from a net loss of ￦3 billion in 2016 to a net gain of ￦92 billion in 2017.

Interest income for this segment, which consists mainly of interest income from held-for-trading securities, remained stable at ￦19 billion in 2016 and 2017.

Net interest income on inter-segment transactions for this segment decreased 40.0% from ￦30 billion in 2016 to ￦18 billion in 2017, principally as a result of a decrease in the average balance of loans to other segments.

Impairment losses due to credit loss and others for this segment changed from net loss of ￦34 billion in 2016 to a net gain of ￦31 billion in 2017, primarily as a result of a credit valuation adjustment relating to derivatives, which mainly reflected a decrease in the volume of such derivatives due to lower exchange rate volatility in 2017.

Non-interest income attributable to this segment increased 25.8% from ￦7,590 billion in 2016 to ￦9,548 billion in 2017, primarily due to an increase in gains on transaction of foreign exchange.

Non-interest expense for this segment increased 24.9% from ￦7,586 billion in 2016 to ￦9,478 billion in 2017, primarily as a result of an increase in losses on transaction of foreign exchange.

Administrative expenses attributable to this segment decreased 11.1% from ￦18 billion in 2016 to ￦16 billion in 2017, primarily due to decreases in salaries and benefits paid, attributable mainly to a reduction in the number of employees in this segment.

Comparison of 2016 to 2015

Our net income (loss) before tax for this segment changed from net income of ￦15 billion in 2015 to a net loss of ￦4 billion in 2016. Net income (loss) after tax also changed from net income of ￦11 billion in 2015 to a net loss of ￦3 billion in 2016.

Interest income for this segment remained stable at ￦19 billion in 2015 and 2016.

Net interest income on inter-segment transactions for this segment increased 36.4% from ￦22 billion in 2015 to ￦30 billion in 2016, principally as a result of a decrease in the average cost of borrowings from other segments, which mainly reflected the decrease in the general level of interest rates in Korea in 2016.

Impairment losses due to credit loss and others for this segment increased 25.9% from ￦27 billion in 2015 to ￦34 billion in 2016, primarily as a result of a credit valuation adjustment relating to derivatives, which mainly reflected an increase in the volume of such derivatives due to higher exchange rate volatility in 2016.

Non-interest income attributable to this segment increased 31.7% from ￦5,761 billion in 2015 to ￦7,590 billion in 2016, primarily due to an increase in gains on transaction of foreign exchange.

Non-interest expense for this segment increased 32.1% from ￦5,743 billion in 2015 to ￦7,586 billion in 2016, primarily as a result of an increase in losses on transaction of foreign exchange.

Administrative expenses attributable to this segment increased 5.9% from ￦17 billion in 2015 to ￦18 billion in 2016, primarily due to an increase in salaries paid to our employees in this segment.

135

Credit Card

This segment consists of our credit card operations. The following table shows, for the periods indicated, our income statement data for this segment:

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Income statement data
Interest income	￦	500		￦	557		￦	600			11.4	%		7.7	%
Interest expense		(122	)		(129	)		(136	)		5.7			5.4
Inter-segment		—			—			—			—			—
Net interest income		378			428			464			13.2			8.4
Non-interest income		871			986			1,164			13.2			18.1
Non-interest expense		(773	)		(906	)		(1,090	)		17.2			20.3
Inter-segment		—			—			—			—			—
Net non-interest expense		98			80			74			(18.4	)		(7.5	)
Administrative expenses		(124	)		(148	)		(165	)		19.4			11.5
Impairment losses due to credit loss and others(1)		(197	)		(216	)		(235	)		9.6			8.8
Total other expenses		(321	)		(364	)		(400	)		13.4			9.9
Operating income		155			144			138			(7.1	)		(4.2	)
Net non-operating loss		(5	)		(2	)		(5	)		(60.0	)		150.0
Net income before tax		150			142			133			(5.3	)		(6.3	)
Income tax expense		(33	)		(33	)		(32	)		—			(3.0	)
Net income	￦	117		￦	109		￦	101			(6.8	)%		(7.3	)%

⁽¹⁾  Consist of impairment losses due to credit loss, gain (loss) on loan sales and provisions (reversal of provisions).

Comparison of 2017 to 2016

Our net income before tax for this segment decreased 6.3% from ￦142 billion in 2016 to ￦133 billion in 2017. Net income after tax also decreased 7.3% from ￦109 billion in 2016 to ￦101 billion in 2017.

Interest income for this segment increased 7.7% from ￦557 billion in 2016 to ￦600 billion in 2017, primarily due to an increase in the average balance of credit card receivables, mainly reflecting an increase in the volume of credit card transactions as well as an increase in credit card issuances, which was offset in part by a decrease in the average yield on such receivables.

Interest expense attributable to this segment increased 5.4% from ￦129 billion in 2016 to ￦136 billion in 2017, primarily due to increased funding needs for this segment in light of the increase in the average balance of credit card receivables.

Impairment losses due to credit loss and others for this segment increased 8.8% from ￦216 billion in 2016 to ￦235 billion in 2017, primarily as a result of an increase in provisions for credit losses, mainly due to an increase in the outstanding balance of our credit card receivables.

Non-interest income attributable to this segment increased 18.1% from ￦986 billion in 2016 to ￦1,164 billion in 2017, primarily due to an increase in credit card fees, mainly reflecting the increase in the average balance of credit card receivables.

Non-interest expense for this segment increased 20.3% from ￦906 billion in 2016 to ￦1,090 billion in 2017, primarily as a result of an increase in credit card commissions, mainly reflecting the increase in the average balance of credit card receivables.

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Administrative expenses attributable to this segment increased 11.5% from ￦148 billion in 2016 to ￦165 billion in 2017, primarily due to an increase in salaries paid to our employees in this segment.

Comparison of 2016 to 2015

Our net income before tax for this segment decreased 5.3% from ￦150 billion in 2015 to ￦142 billion in 2016. Net income after tax also decreased 6.8% from ￦117 billion in 2015 to ￦109 billion in 2016.

Interest income for this segment increased 11.4% from ￦500 billion in 2015 to ￦557 billion in 2016, primarily due to an increase in the average balance of credit card receivables, mainly reflecting an increase in the volume of credit card transactions as well as an increase in credit card issuances.

Interest expense attributable to this segment increased 5.7% from ￦122 billion in 2015 to ￦129 billion in 2016, primarily due to increased funding needs for this segment in light of the increase in the average balance of credit card receivables.

Impairment losses due to credit loss and others for this segment increased 9.6% from ￦197 billion in 2015 to ￦216 billion in 2016, primarily as a result of an increase in provisions for credit losses, mainly due to an increase in the outstanding balance of our credit card receivables.

Non-interest income attributable to this segment increased 13.2% from ￦871 billion in 2015 to ￦986 billion in 2016, primarily due to an increase in credit card fees, mainly reflecting the increase in the average balance of credit card receivables.

Non-interest expense for this segment increased 17.2% from ￦773 billion in 2015 to ￦906 billion in 2016, primarily as a result of an increase in credit card commissions, mainly reflecting the increase in the average balance of credit card receivables.

Administrative expenses attributable to this segment increased 19.4% from ￦124 billion in 2015 to ￦148 billion in 2016, primarily due to an increase in salaries paid to our employees in this segment, principally reflecting an increase in the number of such employees, as well as an increase in advertising expenses.

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Other Operations

Other operations include all of our operations not included in the other segments, including principally the operations of our Credit Management and Collection Department and our Corporate Restoration Department, our treasury operations involving transactions of available-for-sale securities and financing among financial institutions as well as the operations of all of our subsidiaries other than Woori Card. The following table shows, for the periods indicated, our income statement data for this segment:

	Year ended December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Income statement data
Interest income	￦	1,586		￦	1,492		￦	1,361			(5.9	)%		(8.8	)%
Interest expense		(980	)		(864	)		(835	)		(11.8	)		(3.4	)
Inter-segment		137			85			97			(38.0	)		14.1
Net interest income		743			713			623			(4.0	)		(12.6	)
Non-interest income		3,246			4,563			2,683			40.6			(41.2	)
Non-interest expense		(2,908	)		(4,173	)		(2,132	)		43.5			(48.9	)
Inter-segment		(58	)		(87	)		(162	)		50.0			86.2
Net non-interest income		280			303			389			8.2			28.4
Administrative expenses		(555	)		(794	)		(954	)		43.1			20.2
Impairment losses due to credit loss and others(1)		83			219			15			163.9			(93.2	)
Total other expenses		(472	)		(575	)		(939	)		21.8			63.3
Operating income		551			441			73			(20.0	)		(83.4	)
Net non-operating income (loss)		138			56			(113	)		(59.4	)		N/M	(2)
Net income (loss) before tax		689			497			(40	)		(27.9	)		N/M	(2)
Income tax benefit (expense)		(137	)		17			63			N/M	(2)		270.6
Net income	￦	552		￦	514		￦	23			(6.9	)%		(95.7	)%

⁽¹⁾  Consist of impairment losses due to credit loss, gain (loss) on loan sales and provisions (reversal of provisions).

⁽²⁾  N/M = not meaningful.

Comparison of 2017 to 2016

Our net income (loss) before tax for this segment changed from net income of ￦497 billion in 2016 to a net loss of ￦40 billion in 2017. Net income after tax decreased 95.7% from ￦514 billion in 2016 to ￦22 billion in 2017.

Interest income for this segment, which mainly includes interest income due from banks and on certain other loans and financial assets, decreased 8.8% from ￦1,492 billion in 2016 to ￦1,361 billion in 2017, primarily due to the decrease in the general level of interest rates in Korea in 2017 compared to 2016.

Interest expense attributable to this segment, which mainly includes interest expense on debentures, borrowings, call money and deposits due to customers, decreased 3.4% from ￦864 billion in 2016 to ￦835 billion in 2017, primarily due to decreased funding costs for this segment in light of the lower interest rate environment in Korea in 2017.

Net interest income from inter-segment transactions for this segment increased 14.1% from ￦85 billion in 2016 to ￦97 billion in 2017, principally as a result of an increase in the average balance of loans to other segments.

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Impairment losses due to credit loss and others for this segment decreased from a net gain of ￦219 billion in 2016 to a net gain of ￦15 billion in 2017, representing a decrease in net gain of 93.2%, primarily as a result of an increase in provisions for credit losses of our Corporate Restoration Department, mainly reflecting the deterioration of the financial condition of certain companies, which securities were held by such department.

Non-interest income attributable to this segment, which mainly includes gains on transaction of foreign exchange, gains on fair value hedged items and gains on transactions of derivatives, decreased 41.2% from ￦4,563 billion in 2016 to ￦2,683 billion in 2017, primarily due a decrease in gains on transactions of foreign exchange, mainly reflecting lower exchange rate volatility in 2017.

Non-interest expense for this segment, which mainly includes losses on transaction of foreign exchange, losses on fair value hedged items and losses on transactions of derivatives, decreased 48.9% from ￦4,173 billion in 2016 to ￦2,132 billion in 2017, primarily as a result of a decrease in losses on transactions of foreign exchange, mainly reflecting lower exchange rate volatility in 2017.

Administrative expenses attributable to this segment increased 20.2% from ￦794 billion in 2016 to ￦954 billion in 2017, primarily due to an increase in redundancy payments, which are recorded in this segment, resulting mainly from our implementation of an early retirement program in September 2017.

Comparison of 2016 to 2015

Our net income before tax for this segment decreased 27.9% from ￦689 billion in 2015 to ￦497 billion in 2016. Net income after tax also decreased 6.9% from ￦552 billion in 2015 to ￦514 billion in 2016.

Interest income for this segment decreased 5.9% from ￦1,586 billion in 2015 to ￦1,492 billion in 2016, primarily due to the decrease in the general level of interest rates in Korea in 2016.

Interest expense attributable to this segment decreased 11.8% from ￦980 billion in 2015 to ￦864 billion in 2016, primarily due to decreased funding costs for this segment in light of the lower interest rate environment in Korea in 2016.

Net interest income from inter-segment transactions for this segment decreased 38.0% from ￦137 billion in 2015 to ￦85 billion in 2016, principally as a result of a decrease in the average yield on loans to other segments, which mainly reflected the decrease in the general level of interest rates in Korea in 2016.

Impairment losses due to credit loss and others for this segment increased from a net gain of ￦83 billion in 2015 to a net gain of ￦219 billion in 2016, representing an increase in net gain of 163.9%, primarily as a result of an overall improvement in the asset quality of loans in this segment, mainly reflecting our efforts to increase the proportion of loans with higher asset quality and to strengthen credit review and monitoring procedures.

Non-interest income attributable to this segment increased 40.6% from ￦3,246 billion in 2015 to ￦4,563 billion in 2016, primarily due to an increase in gains on transactions of foreign exchange, mainly reflecting higher exchange rate volatility in 2016.

Non-interest expense for this segment increased 43.5% from ￦2,908 billion in 2015 to ￦4,173 billion in 2016, primarily as a result of an increase in losses on transactions of foreign exchange, mainly reflecting higher exchange rate volatility in 2016.

Administrative expenses attributable to this segment increased 43.1% from ￦555 billion in 2015 to ￦794 billion in 2016, primarily due to an increase in redundancy payments, resulting mainly from our implementation of an early retirement program in April and December 2016.

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Item 5.B. Liquidity and Capital Resources

Financial Condition

Assets

The following table sets forth, as of the dates indicated, the principal components of our assets:

	As of December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Cash and cash equivalents	￦	6,644		￦	7,591		￦	6,908			14.3	%		(9.0	)%
Financial assets at fair value through profit or loss		5,133			5,651			5,843			10.1			3.4
Available-for-sale financial assets		17,171			20,818			15,353			21.2			(26.3	)
Held-to-maturity financial assets		13,622			13,910			16,749			2.1			20.4
Loans and receivables:
Due from banks		11,181			14,821			8,871			32.6			(40.1	)
Loans in local currency		185,155			191,309			200,213			3.3			4.7
Loans in foreign currencies		13,105			14,102			13,148			7.6			(6.8	)
Domestic banker’s letter of credit		4,805			3,754			2,517			(21.9	)		(33.0	)
Credit card accounts		6,099			6,674			6,827			9.4			2.3
Bills bought in foreign currencies		6,648			7,759			8,197			16.7			5.6
Bills bought in local currency		135			414			335			206.7			(19.1	)
Factoring receivables		150			97			138			(35.3	)		42.3
Advances for customers on guarantees		44			25			24			(43.2	)		(4.0	)
Privately placed bonds		331			328			362			(0.9	)		10.4
Securitized loans		310			253			563			(18.4	)		122.5
Call loans		2,758			2,985			3,003			8.2			0.6
Bonds purchased under resale agreements		7,584			8,855			16,859			16.8			90.4
Other loans		46			251			511			445.7			103.6
Loan origination costs and fees		435			459			607			5.5			32.2
Present value discount		(5	)		(14	)		(11	)		180.0			(21.4	)
Other receivables		8,539			8,348			6,772			(2.2	)		(18.9	)
Allowance for credit losses		(2,478	)		(2,027	)		(1,830	)		(18.2	)		(9.7	)
Total loans and receivables, net		244,842			258,393			267,106			5.5			3.4
Premises and equipment, net		2,471			2,458			2,478			(0.5	)		0.8
Other assets(1)		1,976			1,862			1,858			(5.8	)		(0.2	)
Total assets	￦	291,859		￦	310,683		￦	316,295			6.4	%		1.8	%

⁽¹⁾  Includes investments in joint ventures and associates, investment properties, intangible assets and goodwill, current tax assets, deferred tax assets, derivative assets, assets held for sale, net defined benefit assets and other assets.

For further information on our assets, see “Item 4.B. Business Overview—Assets and Liabilities.”

Comparison of 2017 to 2016

Our total assets increased 1.8% from ￦310,683 billion as of December 31, 2016 to ￦316,295 billion as of December 31, 2017, primarily as a result of a 3.4% increase in loans and receivables from ￦258,393 billion as of December 31, 2016 to ￦267,106 billion as of December 31, 2017. This increase in loans and receivables was mainly the result of a 4.7% increase in loans in local currency from ￦191,309 billion as of December 31, 2016 to ￦200,213 billion as of December 31, 2017 and a 90.4% increase in bonds purchased under resale agreement from ￦8,855 billion as of December 31, 2016 to ￦16,859 billion as of December 31, 2017, the effect of which was partially offset by a 40.1% decrease in loans and receivables due from banks from ￦14,821 billion as of December 31, 2016 to ￦8,871 billion as of December 31, 2017.

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Comparison of 2016 to 2015

Our total assets increased 6.4% from ￦291,859 billion as of December 31, 2015 to ￦310,683 billion as of December 31, 2016, primarily as a result of a 5.5% increase in loans and receivables from ￦244,842 billion as of December 31, 2015 to ￦258,393 billion as of December 31, 2016. This increase in loans and receivables was mainly the result of a 3.3% increase in loans in local currency from ￦185,155 billion as of December 31, 2015 to ￦191,309 billion as of December 31, 2016 and a 32.6% increase in loans and receivables due from banks from ￦11,181 billion as of December 31, 2015 to ￦14,821 billion as of December 31, 2016.

Liabilities and Equity

The following table sets forth, as of the dates indicated, the principal components of our liabilities and our equity:

	As of December 31,									Percentage change
	2015			2016			2017			2016/2015			2017/2016
	(in billions of Won)									(%)
Liabilities:
Financial liabilities at fair value through profit or loss	￦	3,461		￦	3,803		￦	3,428			9.9	%		(9.9	)%
Deposits due to customers		209,142			221,020			234,695			5.7			6.2
Borrowings		20,034			18,770			14,785			(6.3	)		(21.2	)
Debentures		21,899			23,566			27,869			7.6			18.3
Provisions		517			429			410			(17.0	)		(4.4	)
Other financial liabilities		16,964			21,985			13,892			29.6			(36.8	)
Other liabilities(1)		532			564			651			6.0			15.4
Total liabilities		272,549			290,137			295,730			6.5			1.9
Equity:
Capital stock		3,381			3,381			3,381			—			—
Hybrid securities		3,334			3,575			3,018			7.2			(15.6	)
Capital surplus		294			286			286			(2.7	)		—
Other equity		(1,547	)		(1,468	)		(1,939	)		(5.1	)		32.1
Retained earnings		13,726			14,612			15,620			6.5			6.9
Controlling interests		19,188			20,386			20,366			6.2			(0.1	)
Non-controlling interests		122			160			199			31.1			24.4
Total equity		19,310			20,546			20,565			6.4			0.1
Total liabilities and equity	￦	291,859		￦	310,683		￦	316,295			6.4	%		1.8	%

⁽¹⁾  Includes net defined benefit liability, current tax liabilities, deferred tax liabilities, derivative liabilities and other liabilities.

For further information on our liabilities, see “Item 4.B. Business Overview—Assets and Liabilities.”

Comparison of 2017 to 2016

Our total liabilities increased 1.9% from ￦290,137 billion as of December 31, 2016 to ￦295,730 billion as of December 31, 2017, primarily as a result of increases in deposits due to customers and debentures, the effect of which was partially offset by decreases in other financial liabilities and borrowings. Our deposits due to customers increased 6.2% from ￦221,020 billion as of December 31, 2016 to ￦234,695 billion as of December 31, 2017, mainly due to a 5.8% increase in time deposits in local currency from ￦183,723 billion as of December 31, 2016 to ￦194,293 billion as of December 31, 2017. Debentures increased 18.3% from ￦23,566 billion as of December 31, 2016 to ￦27,870 billion as of December 31, 2017, primarily due to higher issuances of debentures in anticipation of rising interest rate levels. Other financial liabilities decreased 36.8% from ￦21,985 billion as of December 31, 2016 to ￦13,892 as of December 31, 2017, principally due to an 84.6% decrease in domestic exchange payables from ￦8,481 billion as of December 31, 2016 to ￦1,310 billion

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as of December 31, 2017. Borrowings decreased 21.2% from ￦18,770 billion as of December 31, 2016 to ￦14,785 as of December 31, 2017, primarily as a result of a significant decrease in bonds sold under repurchase agreements from ￦2,005 billion as of December 31, 2016 to ￦3 billion as of December 31, 2017.

Our total equity remained relatively stable at ￦20,565 billion as of December 31, 2017, compared to ￦20,546 billion as of December 31, 2016. A 6.9% increase in retained earnings from ￦14,612 billion as of December 31, 2016 to ￦15,620 billion as of December 31, 2017 was offset by a 15.6% decrease in hybrid securities from ￦3,575 billion as of December 31, 2016 to ￦3,018 billion as of December 31, 2017 and a 32.1% increase in negative other equity from ￦1,468 billion as of December 31, 2016 to ￦1,939 billion as of December 31, 2017. The increase in retained earnings was attributable mainly to the net income we generated in 2017. The decrease in hybrid securities was principally due to the redemptions of Won-denominated hybrid securities in March 2017 and U.S. dollar-denominated hybrid securities in May 2017, which were offset in part by the issuance of U.S. dollar-denominated hybrid securities in May 2017. The increase in negative other equity was primarily attributable to a 12.9% increase in negative other capital adjustments from ￦1,607 billion as of December 31, 2016 to ￦1,815 billion as of December 31, 2017 and a more than four-fold increase in loss on foreign currency translation of foreign operations from ￦48 billion as of December 31, 2016 to ￦243 billion as of December 31, 2017.

Comparison of 2016 to 2015

Our total liabilities increased 6.5% from ￦272,549 billion as of December 31, 2015 to ￦290,137 billion as of December 31, 2016, primarily as a result of increases in deposits due to customers and other financial liabilities. Our deposits due to customers increased 5.7% from ￦209,142 billion as of December 31, 2015 to ￦221,020 billion as of December 31, 2016, mainly as a result of a 4.6% increase in time deposits in local currency from ￦175,599 billion as of December 31, 2015 to ￦183,723 billion as of December 31, 2016. Other financial liabilities increased 29.6% from ￦16,964 billion as of December 31, 2015 to ￦21,985 billion as of December 31, 2016, which was principally due to a more than four-fold increase in domestic exchange payables from ￦2,082 billion as of December 31, 2015 to ￦8,481 billion as of December 31, 2016.

Our total equity increased 6.4% from ￦19,310 billion as of December 31, 2015 to ￦20,546 billion as of December 31, 2016. This increase resulted mainly from a 6.5% increase in retained earnings from ￦13,726 billion as of December 31, 2015 to ￦14,612 billion as of December 31, 2016, which was enhanced by a 7.2% increase in hybrid securities from ￦3,334 billion as of December 31, 2015 to ￦3,575 billion as of December 31, 2016. The increase in retained earnings was attributable mainly to the net income we generated in 2016. The increase in hybrid securities was principally due to the issuance of U.S. dollar-denominated hybrid securities in September 2016, which was offset in part by the redemption of Won-denominated hybrid securities in November 2016.

Liquidity

Our primary source of funding has historically been and continues to be customer deposits, particularly lower-cost retail deposits. Customer deposits amounted to ￦209,142 billion, ￦221,020 billion and ￦234,695 billion as of December 31, 2015, 2016 and 2017, which represented approximately 82.2%, 82.8% and 82.7% of our total funding, respectively. We have historically been able to use customer deposits to finance our operations generally, including meeting a portion of our liquidity requirements. Although the majority of deposits are short-term, it has been our experience that the majority of our depositors generally roll over their deposits at maturity, thus providing us with a stable source of funding. However, in the event that a substantial number of our depositors do not roll over their deposits or otherwise decide to withdraw their deposited funds, we would need to place increased reliance on alternative sources of funding, some of which may be more expensive than customer deposits, in order to finance our operations. See “Item 3.D. Risk Factors—Other risks relating to our business—Our funding is highly dependent on short-term deposits, which dependence may adversely affect our operations.” In particular, we may increase our utilization of alternative funding sources such as short-term borrowings and cash and cash equivalents (including funds from maturing loans), as well as liquidating our positions in trading and investment securities and using the proceeds to fund parts of our operations, as necessary.

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We also obtain funding through borrowings and debentures to meet our liquidity needs. Borrowings represented 7.9%, 7.0% and 6.4% of our total funding as of December 31, 2015, 2016 and 2017, respectively. Debentures represented 8.6%, 8.8% and 9.8% of our total funding as of December 31, 2015, 2016 and 2017, respectively. For further information on our sources of funding, see “Item 4.B. Business Overview—Assets and Liabilities—Funding.”

Our liquidity risks arise from withdrawals of deposits and maturities of our borrowings and debentures, as well as our need to fund our lending, trading and investment activities and to manage our trading positions. Our goal in managing our liquidity is to be able, even under adverse conditions, to meet all of our liability repayments on time and to fund all investment opportunities. For a discussion of how we manage our liquidity risk, see “Item 11. Quantitative and Qualitative Disclosures about Market Risk—Liquidity Risk Management.”

The Financial Services Commission requires each Korean bank to maintain specific Won and foreign currency liquidity ratios. These ratios require us to keep our ratio of liquid assets to liquid liabilities above certain minimum levels. For a description of these requirements, see “Item 4.B. Business Overview—Supervision and Regulation—Principal Regulations Applicable to Banks—Liquidity.”

Contractual Obligations and Off-Balance Sheet Arrangements

The following table sets forth our contractual obligations as of December 31, 2017:

	Payments due by period
	Total		Less than 1 year		1-3 years		3-5 years		More than 5 years
	(in billions of Won)
Contractual obligations
Borrowing obligations(1)	￦	15,081	￦	10,676	￦	3,048	￦	877	￦	480
Debenture obligations(1)		29,811		7,171		14,910		4,860		2,870
Deposits(2)(3)		238,250		228,216		6,447		962		2,625
Capital (finance) lease obligations		2		2		—		—		—
Operating lease obligations		1,513		260		493		486		274
Purchase obligations		65		14		20		20		11
Employee severance plan obligations		2,329		68		160		128		1,973
Total	￦	287,051	￦	246,407	￦	25,078	￦	7,333	￦	8,233

⁽¹⁾  Includes estimated future interest payments, which have been estimated using contractual interest rates and scheduled contractual maturities of the outstanding borrowings and debentures as of December 31, 2017. In order to calculate future interest payments on debts with floating rates, we used contractual interest rates as of December 31, 2017.

⁽²⁾  Comprising certificates of deposit, other time deposits and installment deposits.

⁽³⁾  Includes estimated future interest payments, which have been estimated using weighted average interest rates paid for 2017 for each deposit product category and their scheduled contractual maturities.

We utilize credit-related financial instruments with off-balance sheet risk in our normal course of business. The primary purpose of those instruments is to generate fee income for us, in return for making credit support and funds available to our customers as required. Such instruments consist primarily of guarantees, commercial letters of credit and unused lines of credit. Guarantees include guarantees for loans, debentures, trade financing arrangements and guarantees for other financings. Contingent liabilities for which guaranteed amounts are not finalized appear as off-balance sheet items in the notes to the financial statements. Such contingent liabilities include, among others, contingent liabilities relating to trade financings and derivatives contracts with respect to foreign exchange rates and interest rates.

We also enter into transactions with certain structured entities, including through the purchase of their subordinated debt and the provision of credit facilities to them. For further information, see Notes 1-(5) and 1-(7) of the notes to our consolidated financial statements.

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The following table sets forth our off-balance sheet guarantees and commitments as of the dates indicated:

	As of December 31,
	2015		2016		2017
	(in billions of Won)
Confirmed guarantees	￦	9,069	￦	8,270	￦	6,875
Guarantees for loans		108		80		157
Acceptances		618		504		321
Letters of guarantee		100		98		108
Other confirmed guarantees		8,243		7,588		6,289
Unconfirmed guarantees		6,631		5,102		4,527
Local letters of credit		423		398		383
Import letters of credit		4,258		3,844		3,638
Other unconfirmed guarantees		1,950		860		506
Commercial paper purchase commitments and others		1,615		1,390		1,458
Loan commitments and others		93,583		88,636		85,306
Loans		88,212		83,795		80,760
Others		5,371		4,841		4,546

We analyze our off-balance sheet legally binding credit-related commitments for possible losses associated with such commitments. We review the ability of the counterparties of the underlying credit-related commitments to perform their obligations under the commitments and, if we determine that a loss is probable and estimable, we establish allowances for possible losses in a manner similar to allowances that we would establish with respect to a loan granted under the terms of the applicable commitment. These allowances are reflected as provisions in our statement of financial position. As of December 31, 2017, we had established provisions for possible losses of ￦249 billion with respect to our credit-related commitments.

Capital Adequacy

We are subject to the capital adequacy requirements of the Financial Services Commission. The requirements applicable commencing in December 2013 pursuant to amended Financial Services Commission regulations promulgated in July 2013 were formulated based on Basel III, which was first introduced by the Basel Committee on Banking Supervision, Bank for International Settlements in December 2009. Under the amended Financial Services Commission regulations, all banks in Korea are required to maintain certain minimum ratios of Tier I common equity capital, total Tier I capital and total Tier I and Tier II capital to risk-weighted assets. See “Item 4.B. Business Overview—Supervision and Regulation—Principal Regulations Applicable to Banks—Capital Adequacy.”

If a bank fails to maintain its capital adequacy ratios, the Korean regulatory authorities may impose penalties on such bank ranging from a warning to suspension or revocation of its license. See “Item 3.D. Risk Factors—Other risks relating to our business—We may be required to raise additional capital if our capital adequacy ratio deteriorates or the applicable capital requirements change in the future, but we may not be able to do so on favorable terms or at all.”

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The following table sets forth a summary of our capital and capital adequacy ratios as of December 31, 2015, 2016 and 2017 based on IFRS and applicable regulatory reporting standards:

	As of December 31,
	2015			2016			2017
	(in billions of Won, except percentages)
Tier I capital
Tier I common equity capital
Capital stock	￦	3,381		￦	3,381		￦	3,381
Capital surplus		294			286			286
Retained earnings		11,471			14,612			15,620
Non-controlling interests in consolidated subsidiaries		14			22			19
Others		(2,112	)		(2,586	)		(3,231	)
Additional Tier I capital
Hybrid securities		2,970			3,232			3,006
Other equity		46			43			35
Total Tier I capital	￦	16,064		￦	18,990		￦	19,116
Tier II capital
Allowance for credit losses(1)	￦	1,145		￦	145		￦	78
Subordinated debt		3,831			2,292			1,870
Valuation gain on investment securities		—			—			—
Others		11			1,474			1,539
Total Tier II capital	￦	4,987		￦	3,911		￦	3,487
Total Tier I and Tier II capital	￦	21,051		￦	22,901		￦	22,603
Risk-weighted assets
Credit risk-weighted assets	￦	142,127		￦	138,018		￦	134,768
Market risk-weighted assets		2,596			2,278			2,317
Operational risk-weighted assets		9,348			9,432			9,677
Total	￦	154,071		￦	149,728		￦	146,762
Tier I common equity capital ratio		8.47	%		10.50	%		10.95	%
Total Tier I capital ratio		10.43	%		12.68	%		13.03	%
Tier II capital ratio		3.23	%		2.61	%		2.37	%
Total Tier I and Tier II capital ratio		13.66	%		15.29	%		15.40	%

⁽¹⁾  Allowance for credit losses in respect of credits classified as normal or precautionary are used to calculate Tier II capital only to the extent such allowances represent up to 1.25% of risk-weighted assets.

Recent Accounting Pronouncements

IFRS 9 Financial Instruments, issued by the IASB in July 2014, is a new IFRS accounting standard aimed at improving and simplifying the accounting treatment of financial instruments and is effective for annual periods beginning on or after January 1, 2018. IFRS 9, which replaces International Accounting Standard 39, Financial Instruments: Recognition and Measurement, requires financial assets to be classified and measured on the basis of an entity’s business model for managing financial assets and the contractual cash flow characteristics of the financial assets. A new impairment model is introduced which requires the calculation of allowance for credit losses based on expected credit losses instead of incurred losses (as is the case under International Accounting Standard 39) by assessing changes in expected credit losses and recognizing such changes as impairment loss (or reversal of impairment loss) in profit or loss. Also, hedge accounting rules are amended to extend to more hedging relationships and to allow more hedging instruments and hedged items to qualify for hedge accounting. The impact on our financial statements due to the application of IFRS 9 will depend on judgments made by us in applying the new standard, the nature of financial instruments held by us and macroeconomic variables.

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We have performed an assessment of the financial impact of IFRS 9 on our consolidated financial statements. The application of IFRS 9 will result in higher impairment loss allowances that are recognized earlier, on a more forward-looking basis and on a broader scope of financial instruments than is the case under International Accounting Standard 39 and, as a result, will have a material impact on our reported financial condition. In addition, the move from incurred to expected credit losses will have the potential to impact our performance under stressed economic conditions or regulatory stress tests. In particular, the application of IFRS 9 will result in a one-off increase in allowance for credit losses and a corresponding decrease in our retained earnings in our consolidated statement of financial position, which could also negatively impact our regulatory capital position. Measurement will require increased complexity in our impairment modeling as it will involve a greater degree of management judgment with respect to forward-looking information. We expect that impairment charges will tend to be more volatile as a result. For further information regarding IFRS 9, see Note 2-(1)-2) of the notes to our consolidated financial statements.

For a description of other recent accounting pronouncements under IFRS as issued by the IASB that have been issued but are not yet effective, see Note 2-(1)-2) of the notes to our consolidated financial statements.

Item 5.C. Research and Development, Patents and Licenses, etc.

Not Applicable

Item 5.D. Trend Information

These matters are discussed under Item 5.A and Item 5.B above where relevant.

Item 5.E. Off-Balance Sheet Arrangements

See “Item 5.B. Liquidity and Capital Resources—Financial Condition—Contractual Obligations and Off-Balance Sheet Arrangements.”

Item 5.F. Tabular Disclosure of Contractual Obligations

See “Item 5.B. Liquidity and Capital Resources—Financial Condition—Contractual Obligations and Off-Balance Sheet Arrangements.”

Item 5.G. Safe Harbor

See “Forward-Looking Statements.”

Item 6. DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES

Item 6.A. Directors and Senior Management

Board of Directors

Our board of directors has the ultimate responsibility for managing our affairs. The board currently comprises two standing directors, one non-standing director and five outside directors. Standing directors are directors who are either our full-time executive officers or our standing Audit Committee members, while non-standing directors and outside directors are directors who are not full-time executive officers. Outside directors represent a cross-section of respected and experienced members of the academic, financial, corporate and other fields in Korea and elsewhere, and must also satisfy certain requirements under Korean law and our articles of incorporation to evidence their independence from us.

Our articles of incorporation provide that the board can have no less than five directors. Standing directors must comprise less than 50% of the total number of directors, and there must be at least three outside directors. Each director may be elected for a term of office not exceeding three years and may be re-elected, provided that each outside director may be elected for a term of office not exceeding three years and may be re-elected on an annual basis but may not serve in such office for more than six consecutive years. In addition, with respect to all

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directors, such term of office is extended until the close of the annual general meeting of shareholders convened in respect of the last fiscal year of the director’s term of office. These terms are subject to the Korean Commercial Code, the Bank Act and related regulations.

Pursuant to an agreement we entered into with the KDIC in December 2016, we are required to use our best efforts to cause an employee of the KDIC nominated by it to be appointed as our non-standing director, so long as the KDIC either (x) owns 10% or more of our total issued shares with voting rights or (y) owns more than 4% but less than 10% of our total issued shares with voting rights and remains our largest shareholder (other than the National Pension Service of Korea). See “Item 10.C. Material Contracts.”

Our board of directors meets regularly on a quarterly basis to discuss and resolve various corporate matters. The board may also convene for additional extraordinary meetings at the request of the president or chairman of the board. A director (other than the president or chairman of the board) may request the president or chairman of the board to convene an extraordinary meeting. In the event that the president or chairman of the board rejects such request without justifiable reason, another director may convene the extraordinary meeting.

The names and positions of our directors are set forth below. The business address of all of the directors is our registered office at 51, Sogong-ro, Jung-gu, Seoul, Korea.

Standing Directors

Our standing directors are as follows:

Name	Age		Position	Director Since
Tae-Seung Sohn		60	President and Chief Executive Officer	December 22, 2017
Jung-Sik Oh		62	Director and Standing Audit Committee Member	March 24, 2017

None of these directors is involved in any significant business activities outside us and our subsidiaries.

Tae-Seung Sohn is our president and chief executive officer. He was appointed as president and chief executive officer in December 2017. Previously, he served as head of the global business unit. Prior to that, he was a managing director of the financial market business division. Mr. Sohn holds a Bachelor of Laws from Sungkyunkwan University, a Master of Laws from Seoul National University and a Master of Business Administration from the Helsinki School of Economics.

Jung-Sik Oh is a standing Audit Committee member. He was appointed as a standing Audit Committee member in March 2017. Prior to joining us, he was the representative director of KB Capital. He holds a Bachelor of Arts in International Economics from Seoul National University.

Non-Standing Director

Our non-standing director is as follows:

Name	Age		Position	Director Since	Year Term Ends(1)
Chang-Sik Bae		54	Non-Standing Director	March 23, 2018		2020

⁽¹⁾  The date on which the term will end will be the date of the general shareholders’ meeting in the relevant year.

Chang-Sik Bae was elected as a non-standing director in March 2018. He currently serves as the head of the Office of Human Resources Development at the KDIC. He holds a Bachelor of Arts in International Trade from Hankuk University of Foreign Studies.

Outside Directors

We currently have five outside directors. Pursuant to a commitment made by the KDIC in connection with the bidding process for the sale of a combined 29.7% ownership interest in us in December 2016 and January 2017, five of the seven winning bidders each nominated one person to become a new outside director, and each

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such nominee was elected as a new outside director at an extraordinary general meeting of our shareholders held in December 2016. See “Item 4.A. History and Development of the Company—Privatization Plan—Sales of the KDIC’s Ownership Interest.”

Our outside directors are as follows:

Name	Age		Position	Director Since	End of Term
Dong-Woo Chang		51	Outside Director	December 30, 2016		December 30, 2018
Sang-Yong Park		67	Outside Director	December 30, 2016		December 30, 2018
Sung-Tae Ro		71	Outside Director	December 30, 2016		December 30, 2018
Sang-Hoon Shin		69	Outside Director	December 30, 2016		December 30, 2018
Zhiping Tian		52	Outside Director	December 30, 2016		December 30, 2018

Dong-Woo Chang was elected as an outside director in December 2016. He is currently the chief executive officer and representative director of IMM Investment Corp. He received a Bachelor of Laws from Hanyang University in 1991.

Sang-Yong Park was elected as an outside director in December 2016. He currently serves as an honorary professor at the School of Business at Yonsei University. He received a Bachelor of Arts in Business Administration from Yonsei University in 1973 and a Master of Business Administration and a Ph.D. in Business Administration from New York University in 1982 and 1984, respectively.

Sung-Tae Ro was elected as an outside director in December 2016. He previously served as the president of Hanwha Life Economic Research Institute and Korea Economic Research Institute. He received a Bachelor of Arts in Economics from Seoul National University in 1969 and a Master of Arts and a Ph.D. in Economics from Harvard University in 1983 and 1984, respectively.

Sang-Hoon Shin was elected as an outside director in December 2016. He previously served as the president and chief executive officer of Shinhan Financial Group. He received a Bachelor of Arts in Business Administration from Sungkyunkwan University in 1976 and a Master of Business Administration from Yonsei University Graduate School of Business in 1987.

Zhiping Tian was elected as an outside director in December 2016. He currently serves as a vice general manager at China Fellow Partners Limited. He received a Bachelor of Arts in Government Economics Management from Shanxi University of Finance & Economics in 1988, an International Master of Business Administration from the University of Hong Kong and a Master of Business Administration from the Southwestern University of Finance and Economics in 2005.

If any director wishes to enter into a transaction with us in his or her personal capacity, he or she must obtain the prior approval of our board of directors. The director having an interest in the transaction may not vote at the meeting during which the board approves the transaction.

Executive Officers

In addition to the standing directors who are also our executive officers, we currently have the following 22 executive officers.

Name	Age		Position
An-Ho Jang		60	Executive Vice President
Woon-Haeng Cho		59	Executive Vice President
Seong-Il Park		62	Compliance Officer
Sun-Kyu Kim		60	Executive Vice President
Yeong-Bae Kim		62	Executive Vice President
Jeong-Jin Heo		61	Executive Vice President
Dong-Yeon Lee		59	Executive Vice President
Hyun-Poong Hong		61	Executive Vice President
Chai-Pong Cheong		60	Executive Vice President

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Name	Age		Position
Chang-Jae Lee		58	Executive Vice President
Jeong-Ki Kim		58	Executive Vice President
Tae-Joong Ha		60	Managing Director
Jong-In Lee		60	Managing Director
Won-Duk Lee		58	Managing Director
Hong-Sik Choi		60	Managing Director
Su-Hyeong Cho		59	Managing Director
Hwa-Jae Park		59	Managing Director
Myung-Hyuk Shin		59	Managing Director
Dong-Su Choi		58	Managing Director
Jong-Suk Jeong		58	Managing Director
Kyong-Hoon Park		58	Managing Director
Jong-Deuk Kim		57	Managing Director

An-Ho Jang serves as serves as an executive vice president in charge of the domestic business unit and head of the retail banking business group. Previously, he served as an executive vice president and head of the corporate banking business group. Prior to serving as executive vice president, he was a managing director of the human resources division. He holds a Bachelor of Arts in French Literature from Chonbuk National University.

Woon-Haeng Cho serves as an executive vice president in charge of the business support unit and head of the human resources group. Previously, he served as an executive vice president and head of the institutional banking business group. Prior to serving as executive vice president, he was a managing director of the operation and support division. He holds a Bachelor of Arts in Business Administration from Kyunghee University.

Seong-Il Park serves as an executive vice president and the compliance officer. Prior to serving as executive vice president, he was the compliance officer and a managing director. He holds a Bachelor of Arts in Business Administration from Chungnam National University.

Sun-Kyu Kim serves as an executive vice president and head of the credit support group. Prior to serving as executive vice president, he was a managing director of the corporate restructuring division. He holds a Bachelor of Arts in International Trade from Sejong University.

Yeong-Bae Kim serves as an executive vice president and head of the international trade business group. Previously, he served as a managing director and head of the international trade business division. Prior to serving as managing director, he was the senior general manager of the Daegu-Gyeongbuk regional banking headquarters. He is a graduate of Daegu Commercial High School.

Jeong-Jin Heo serves as an executive vice president in charge of the institutional banking business group and head of the information security division. Previously, he served as a managing director and head of the information security division. Prior to serving as managing director, he was the senior general manager of the information security department. He holds a Bachelor of Arts in International Trade from Kookje University.

Dong-Yeon Lee serves as an executive vice president and head of the small and medium corporate banking business group. Previously, he was the senior general manager of the loan service center. He holds a Master of Arts in Political Administration Leadership from the Graduate School of Public Administration of Yonsei University.

Hyun-Poong Hong serves as an executive vice president in charge of the digital business group. Previously, he served as a managing director and head of the next generation ICT system building division. Prior to serving as managing director, he was the senior general manager of the next generation ICT system building division. He holds a Bachelor of Arts in Economics from Hanyang University.

Chai-Pong Cheong serves as an executive vice president in charge of the investment banking business group. Previously, he served as a managing director and head of the wealth management group. Prior to serving as managing director, he was the senior general manager of the wealth management division. He holds a Ph.D. in Business Administration from Dongguk University.

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Chang-Jae Lee serves as an executive vice president in charge of the real estate finance business group. Previously, he served as a managing director and head of the pension and trust business group. Prior to serving as managing director, he was the senior general manager of the regional banking headquarters. He holds a Bachelor of Arts in Real Estate Studies from Seoul Digital University.

Jeong-Ki Kim serves as an executive vice president in charge of the corporate banking business group. Previously, he served as a managing director and head of the external relations division. Prior to serving as managing director, he was the senior general manager of the regional banking headquarters. He holds a Bachelor of Arts in Agricultural Economics from Chungbuk National University.

Tae-Joong Ha serves as a managing director and head of the corporate restructuring division. Prior to serving as managing director, he was the senior general manager of the head office corporate banking headquarters. He holds a Bachelor of Arts in Accounting from Kyungpook National University.

Jong-In Lee serves as a managing director and head of the risk management group. Previously, he served as a managing director and head of the financial market business group. Prior to serving as managing director, he was the senior general manager of the regional banking headquarters. He holds a Master of Arts in Financial Management from Korea University Business School.

Won-Duk Lee serves as a managing director and head of the management and finance planning group. Previously, he served as a managing director and head of the future strategy division. Prior to serving as managing director, he was the senior general manager of the future strategy department. He holds a Master of Arts in Economics from Seoul National University.

Hong-Sik Choi serves as a managing director and head of the next generation ICT system building division. Prior to serving as managing director, he was the senior general manager of the regional banking headquarters. He holds a Bachelor of Arts in Business Administration from Korea National Open University.

Su-Hyeong Cho serves as a managing director and head of the consumer and brand group. Prior to serving as managing director, he was the senior general manager of the corporate banking headquarters. He holds a Bachelor of Arts in Sociology from Sungkyunkwan University.

Hwa-Jae Park serves as a managing director and head of the operation and support group. Prior to serving as managing director, he was the senior general manager of the regional banking headquarters. He holds a Bachelor of Arts in Business Administration from Korea Soongsil Cyber University and a Master of Arts in Business Administration from Dongguk University.

Myung-Hyuk Shin serves as a managing director and head of the pension and trust business group. Prior to serving as managing director, he was the senior general manager of the regional banking headquarters. He holds a Bachelor of Arts in Chinese from Hankuk University of Foreign Studies.

Dong-Su Choi serves as a managing director and head of the future strategy division. Previously, he served as head of the head office business department and the consumer protection center. He holds a Bachelor of Arts in Economics from Chung-Ang University and a Master of Arts in Business Administration from Korea University Business School.

Jong-Suk Jeong serves as a managing director and head of the wealth management group. Prior to serving as managing director, he was the senior general manager of the regional banking headquarters. He holds a Bachelor of Arts in Business Administration from Korea National Open University and a Master of Arts in Public Administration from Yonsei Graduate School of Public Administration.

Kyong-Hoon Park serves as a managing director and head of Global business group. Prior to serving as managing director, he was the senior general manager of the corporate banking headquarters. He holds a Bachelor of Arts in International Economics from Seoul National University.

Jong-Deuk Kim serves as a managing director and head of the financial market business group. Previously, he served as a managing director and head of the audit department and the head office business department. He holds a Bachelor of Arts in Regional Development Studies from Dankook University.

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None of the executive officers is involved in any significant business activities outside us and our subsidiaries.

Item 6.B. Compensation

The aggregate remuneration and benefits-in-kind we paid in 2017 to our directors and our other executive officers, including the compliance officer and managing directors, was ￦5,790 million. In 2017, we did not record additional provisions for allowances for severance and retirement benefits for such directors and officers. We do not have service contracts with any of these directors or officers that provide for benefits if employment with us is terminated.

The compensation of our director who received total annual compensation exceeding ￦500 million in 2017 was as follows:

Name	Position		Total Compensation in 2017 (in millions of Won)(1)
Kwang-Goo Lee		Former President and Chief Executive Officer	￦	936

⁽¹⁾  Includes severance payments.

In 2017, we did not grant any stock options and, accordingly, did not recognize any compensation expense for stock options granted under our stock option plan. As of the date of this annual report, we do not have any stock options outstanding.

Item 6.C. Board Practices

See “Item 6.A. Directors and Senior Management—Board of Directors” and “Item 6.B. Compensation” for information concerning the terms of office and contractual employment arrangements with our directors and executive officers.

Committees of the Board of Directors

We currently have five committees that serve under the board:

• the Board of Directors Management Committee;

• the Board Risk Management Committee;

• the Audit Committee;

• the Compensation Committee; and

• the Committee for Recommending Executive Officer Candidates.

The board appoints each member of these committees except for members of the Audit Committee, who are elected by our shareholders at the annual general meeting.

Board of Directors Management Committee

This committee consists of one standing director, one non-standing director and all five outside directors: Tae-Seung Sohn, Chang-Sik Bae, Dong-Woo Chang, Sang-Yong Park, Sung-Tae Ro, Sang-Hoon Shin and Zhiping Tian. The chairman is Sung-Tae Ro. This committee, which functions as a steering committee, provides administrative support for the operations of our board of directors. It is responsible for the following:

• setting rules and procedures for operations of our board and its various committees;

• addressing corporate governance issues; and

• reviewing all reports to be submitted to the board and other matters that are deemed necessary by the board or various sub-committees of the board.

This committee holds regular meetings every quarter.

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Board Risk Management Committee

This committee consists of one non-standing director and three outside directors: Chang-Sik Bae, Sang-Yong Park, Sung-Tae Ro and Zhiping Tian. The chairman is Sang-Yong Park. It oversees and makes determinations on all significant issues relating to our risk management system. It implements policies regarding, monitors and has ultimate responsibility for managing credit, market and liquidity risk and asset and liability management. The major roles of the Board Risk Management Committee include:

• determining and amending risk management policies, guidelines and limits in conformity with the strategy established by the board of directors;

• determining the appropriate level of risks that we should be willing to undertake, including in connection with key business activities such as acquisitions, investments or entering into new business areas, prior to a decision by the board of directors on such matters;

• allocating risk capital and approving our business groups’ risk limit requests;

• reviewing our risk profile, including the level of risks we are exposed to and the status of our risk management operations; and

• monitoring our compliance with our risk policies.

The Board Risk Management Committee regularly receives reports from the Executive Risk Management Committee as well as the Risk Management Department, which in turn receives reports from subsidiary level risk management committees and groups. See “Item 11. Quantitative and Qualitative Disclosures about Market Risk.” The committee holds regular meetings every quarter.

Audit Committee

This committee consists of two outside directors and one standing director: Dong-Woo Chang, Sang-Hoon Shin and Jung-Sik Oh. The chairman is Sang-Hoon Shin. It reviews all audit and compliance-related matters and makes recommendations to our board. The Audit Committee, whose members must meet certain qualifications as experts under the committee charter, is also responsible for the following:

• formulating, executing, evaluating and managing internal audit plans (including the financial and operational audits);

• approving the appointment and dismissal of the head of the audit team;

• approving the appointment of external auditors and evaluating the activities carried out by external auditors;

• formulating appropriate measures to correct problems identified from internal audits;

• overseeing our reporting systems in light of relevant disclosure rules and requirements to ensure compliance with applicable regulations; and

• examining internal procedures or making decisions on material matters that are related to audits as determined by the regulatory authorities, our board or other committees.

This committee also makes recommendations on regulatory issues to the Financial Supervisory Service, if and when deemed necessary. In addition, in connection with general meetings of shareholders, the committee examines the agenda for, and financial statements and other reports to be submitted by the board of directors, to each general meeting of shareholders. The internal and external auditors report directly to the Audit Committee chairman. Our external auditor is invited to attend meetings of this committee when needed or when matters pertaining to the audit are discussed.

The committee holds regular meetings every quarter or as necessary.

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Compensation Committee

This committee consists of one non-standing director and all five of our outside directors: Chang-Sik Bae, Dong-Woo Chang, Sang-Yong Park, Sung-Tae Ro, Sang-Hoon Shin and Zhiping Tian. The chairman is Sang-Hoon Shin. It is responsible for all matters relating to the following:

• evaluating management’s performance in developing our business;

• setting goals and targets with respect to executive performance; and

• fixing executive compensation, including incentives and bonuses.

This committee holds regular meetings every quarter.

Committee for Recommending Executive Officer Candidates

This committee consists of one standing director and all five of our outside directors: Tae-Seung Sohn, Dong-Woo Chang, Sang-Yong Park, Sung-Tae Ro, Sang-Hoon Shin and Zhiping Tian. The chairman is Dong-Woo Chang. This committee holds meetings when an Audit Committee member, an outside director or our president and chief executive officer needs to be appointed.

Item 6.D. Employees

As of December 31, 2017, we had a total of 13,637 full-time employees, excluding employees of our subsidiaries. The following table sets forth information regarding our employees as of the dates indicated:

	As of December 31,
	2015		2016		2017
Full-time employees		15,270		14,861		13,637
Contractual employees		583		675		625
Total		15,853		15,536		14,262

Approximately 70.9% of our employees as of December 31, 2017 were members of the Korea Financial Industry Union. We have not experienced any significant labor disputes in recent years, although we have made certain concessions to our labor unions. See “Item 3.D. Risk Factors—Other risks relating to our business—Labor union unrest may disrupt our operations and hinder our ability to continue to reorganize our operations.” We have placed a high priority on our relationship with our employees and on maintaining an atmosphere of trust and cooperation between our labor and management.

Our salary system with respect to our employees is based on a combination of the agreed-upon base salary and bonuses reflecting the work productivity and performance of each employee and the relevant business group. We believe that the salaries we pay to our employees and management are similar to those of other large financial institutions in Korea. We evaluate employees twice a year (usually in January and July), based on our business performance and evaluations provided by co-workers and superiors. With respect to our compensation program, we do not provide housing leases or loans to our employees.

We operate a “wage peak” system, under which an employee’s wages reach a certain peak and then are gradually reduced as the employee reaches retirement age.

We have an employee stock ownership association, which purchases our shares at the request of our employees using their own funds. We do not provide any compensation benefits to employees through such purchases, although the association is entitled to certain pre-emptive rights. See “Item 10B. Memorandum and Articles of Association—Pre-emptive Rights and Issuances of Additional Shares.”

We also provide a wide range of benefits to our employees, including medical insurance, employment insurance, workers compensation, life insurance, financial aid for children’s tuition and pension plans.

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In accordance with the National Pension Act, we contribute an amount equal to 4.5% of employee wages, and each employee contributes 4.5% of his or her wages, into each employee’s personal pension account. In addition, in accordance with the Guarantee of Worker’s Retirement Benefits Act, we have adopted a retirement pension plan for our employees. Contributions under the retirement pension plan are deposited annually into a financial institution, and an employee may elect to receive a monthly pension or a lump-sum amount upon retirement. Our retirement pension plans are provided in the form of a defined benefit plan and a defined contribution plan. The defined benefit plan guarantees a certain payout at retirement, according to a fixed formula based on the employee’s average salary and the number of years for which the employee has been a plan member. The defined contribution plan, in which the employer’s contribution is determined in advance based on one-twelfth of an employee’s total annual pay, is managed directly by the employees. Under Korean law, we may not terminate the employment of full-time employees except under certain limited circumstances.

Item 6.E. Share Ownership

Common Stock

As of April 20, 2018, the persons who are currently our directors or executive officers, in the aggregate, held 352,917 shares of our common stock. None of these persons individually held more than 1% of our outstanding common stock as of such date. The following table presents information regarding our directors and executive officers who beneficially owned our shares as of April 20, 2018.

Name of Executive Officer or Director	Number of Shares of Common Stock
Tae-Seung Sohn		38,127
Jung-Sik Oh		5,000
Sang-Yong Park		1,000
Sung-Tae Ro		5,000
Sang-Hoon Shin		15,000
An-Ho Jang		5,380
Woon-Haeng Cho		27,345
Seong-Il Park		15,914
Sun-Kyu Kim		15,665
Yeong-Bae Kim		10,442
Jeong-Jin Heo		14,083
Dong-Yeon Lee		17,741
Hyun-Poong Hong		8,110
Chai-Pong Cheong		12,483
Chang-Jae Lee		15,938
Jeong-Ki Kim		26,477
Tae-Joong Ha		13,076
Jong-In Lee		13,046
Won-Duk Lee		2,000
Hong-Sik Choi		9,593
Su-Hyeong Cho		12,956
Hwa-Jae Park		17,523
Myung-Hyuk Shin		8,713
Dong-Su Choi		10,738
Jong-Suk Jeong		13,664
Kyeong-Hun Park		7,877
Jong-Deuk Kim		10,026
Total		352,917

Stock Options

As of the date of this annual report, we do not have any stock options outstanding.

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Item 7. MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS

Item 7.A. Major Shareholders

The following table presents information regarding the beneficial ownership of our common stock at April 20, 2018 (unless otherwise indicated) by each person or entity known to us to own beneficially more than 5% of the outstanding shares of our common stock.

Except as otherwise indicated, each shareholder identified by name has:

• sole voting and investment power with respect to its shares; and

• record and beneficial ownership with respect to its shares.

Beneficial Owner	Number of Shares of Common Stock		Percentage of Total Shares of Common Stock		Percentage of Total Shares on a Fully Diluted Basis
KDIC		124,604,797		18.43		18.43
National Pension Service		62,809,267		9.29		9.29
Nobis1, Inc. (1)		40,560,000		6.00		6.00

⁽¹⁾  Nobis1, Inc., which is an affiliate of IMM Private Equity, acquired 27,040,000 shares of our common stock, or 4.00% of our outstanding common stock, in December 2016. In accordance with the Bank Act, Nobis1, Inc. received approval from the Financial Services Commission for the acquisition of an additional 13,520,000 shares of our common stock, or 2.00% of our outstanding common stock, in January 2017, pursuant to an agreement not to exercise the voting rights with respect to such shares.

Pursuant to the Korean government’s privatization plan, in December 2014, the KDIC sold 40,143,022 shares of our common stock (representing 5.9% of our outstanding common stock) in a private sale in Korea. In addition, in December 2016 and January 2017, the KDIC sold an aggregate of 200,685,395 shares of our common stock (representing 29.7% of our outstanding common stock) in stakes ranging from 3.7% to 6.0% to seven financial companies through a bidding process. Pursuant to a commitment made by the KDIC in connection with such bidding process, five persons, each nominated by one of the winning bidders, were elected as new outside directors at an extraordinary general meeting of our shareholders held in December 2016. See “Item 6.A. Directors and Senior Management—Board of Directors—Outside Directors.” In 2017, pursuant to a series of transactions related to call options previously granted in connection with the KDIC’s sale of our common stock in December 2014, the KDIC sold an aggregate of 19,852,364 shares of our common stock (representing 2.94% of our outstanding common stock). As a result of such transactions, the KDIC’s ownership interest in us was reduced to 18.43%. We expect the KDIC to sell all or a portion of the remaining shares of our common stock it owns to one or more purchasers in the future.

As of April 20, 2018, our president and chief executive officer owned 38,127 shares of our common stock. Our executive officers (excluding our president and chief executive officer) collectively owned 288,790 shares of our common stock. Our outside directors collectively owned 26,000 shares of our common stock.

Other than as set forth above, no other person or entity known by us to be acting in concert, directly or indirectly, jointly or separately, owned 5.0% or more of the outstanding shares of our common stock or exercised control or could exercise control over us as of April 20, 2018. None of our major shareholders has different voting rights from our other shareholders. However, pursuant to an agreement we entered into with the KDIC in December 2016, the KDIC has the right to require us to use our best efforts to cause an employee of the KDIC nominated by it to be appointed as our non-standing director, so long as the KDIC either (x) owns 10% or more of our total issued shares with voting rights or (y) owns more than 4% but less than 10% of our total issued shares with voting rights and remains our largest shareholder (other than the National Pension Service of Korea). See “Item 10.C. Material Contracts.”

As of the close of our shareholders’ register on December 31, 2017, approximately 72.8% of our issued shares were held in Korea by approximately 43,774 shareholders.

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Item 7.B. Related Party Transactions

We regularly engage in transactions with entities affiliated with the government, which currently owns 18.43% of our shares through the KDIC. Generally, these transactions include the extension of loans, the purchase of debt securities and other ordinary course activities relating to our banking business. For a description of such transactions, see “Item 4.B. Business Overview—Assets and Liabilities.” In addition, as of December 31, 2017, we owned ￦30 billion of debentures issued by the KDIC, representing 0.1% of our investment securities.

As of December 31, 2017, we also had loans outstanding to our executive officers and directors in the aggregate amount of ￦2,439 million.

All of these loans were made in the ordinary course of business, on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other persons and did not involve more than the normal risk of collectability or present other unfavorable features.

None of our directors or officers has or had any interest in any transactions effected by us that are or were unusual in their nature or conditions or significant to our business which were effected during the current or immediately preceding year or were effected during an earlier year and remain in any respect outstanding or unperformed.

Item 7.C. Interest of Experts and Counsel

Not Applicable

Item 8. FINANCIAL INFORMATION

Item 8.A. Consolidated Statements and Other Financial Information

See “Item 18. Financial Statements” and pages F-1 through F-126.

Legal Proceedings

As a financial institution with diverse operations, we are subject to legal proceedings and regulatory actions in the ordinary course of our business.

In November 2017, the Seoul Northern District Prosecutors’ Office commenced an investigation into alleged business interference in our hiring practices for new employees. According to the allegations made by the Seoul Northern District Prosecutors’ Office, certain of our executive officers and other employees interfered with our business by unfairly giving favorable treatment to specific individuals in connection with their hiring from 2015 to 2017. While the investigation is currently ongoing and, as of the date of this annual report, there have been no formal charges or indictments against us, six of our current and former employees were indicted in February 2018 in connection with such allegations. The trial against such individuals is currently ongoing in the Seoul Northern District Court.

In March 2018, AJ Energy filed a lawsuit against us and Woori America Bank in the Supreme Court of the State of New York, seeking to recover an alleged transfer to us from its foreign investors through an intermediary bank in the amount of EUR 8 billion. The intermediary bank involved has informed us that it has no evidence of the alleged transfer, and we also have no records of such transfer and believe that the evidence presented by AJ Energy is forged. We believe that the lawsuit is without merit and plan to respond proactively, including potentially through civil or criminal complaints against the plaintiff. We expect that the court will dismiss the lawsuit in an expeditious manner.

Other than the legal proceedings discussed above, we and our subsidiaries are not a party to any legal or administrative proceedings, and no proceedings are known by us to be contemplated by governmental authorities or third parties, which, if adversely determined, may have a material adverse effect on our financial condition or results of operations.

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Dividends

We declare our dividend annually at the annual general meeting of shareholders. We generally hold this meeting within three months after the end of each fiscal year. We must pay the annual dividend to the shareholders of record as of the end of the preceding fiscal year within one month after that meeting. We can distribute the annual dividend either in cash or in stock. Cash dividends may be paid out of retained earnings that have not been appropriated to statutory reserves. In addition, we may declare, and distribute in cash, interim dividends once a year pursuant to a board resolution.

The table below sets forth the dividend per share of common stock and the total amount of dividends declared by us in respect of the years ended December 31, 2015, 2016 and 2017. Except as otherwise noted, the dividends set forth below with respect to each year were declared, paid and recorded in the following year.

Fiscal year	Dividends Per Share of Common Stock		Total Amount Of Cash Dividends Paid
	(in Won)		(in millions of Won)
2015(1)		500		336,635
2016		400		269,308
2017(2)		600		403,963

⁽¹⁾  Includes interim dividends of ￦250 per share of common stock declared and paid in August 2015.

⁽²⁾  Includes interim dividends of ￦100 per share of common stock declared and paid in August 2017.

Future dividends will depend upon our revenues, cash flow, financial condition and other factors. As an owner of ADSs, you will be entitled to receive dividends payable in respect of the shares of common stock represented by such ADSs.

For a description of the tax consequences of dividends paid to our shareholders, see “Item 10.E. Taxation—United States Taxation—Dividends” and “—Korean Taxation—Taxation of Dividends on Common Shares or ADSs.”

Item 8.B. Significant Changes

Not Applicable

Item 9. THE OFFER AND LISTING

Item 9.A. Offering and Listing Details

Market Price Information

The principal trading market for our common stock is the KRX KOSPI Market. Woori Finance Holdings’ common stock was listed on the KRX KOSPI Market on June 24, 2002, and was suspended from trading from October 30, 2014 and de-listed on November 18, 2014 following the merger of Woori Finance Holdings with us. Our common stock, which is in registered form and has a par value of ￦5,000 per share of common stock, was newly listed on the KRX KOSPI Market under the identifying code 000030 on November 19, 2014 following the merger. As of the date of this annual report, we have 673,271,226 shares of common stock outstanding. Woori Finance Holdings’ ADSs were listed on the New York Stock Exchange and identified by the symbol “WF” since September 29, 2003, and were traded under the CUSIP number 981063100. Following the merger, we succeeded to Woori Finance Holdings’ listing on the New York Stock Exchange. Our ADSs are identified by the symbol “WF” and are traded under the CUSIP number 98105T104.

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The table below sets forth, for the periods indicated, the high and low closing prices and the average daily volume of trading activity on the KRX KOSPI Market for our or Woori Finance Holdings’ common stock, as applicable, and the high and low closing prices and the average daily volume of trading activity on the New York Stock Exchange for our or Woori Finance Holdings’ ADSs, as applicable.

	KRX KOSPI Market						New York Stock Exchange(1)
	Closing Price Per Common Stock				Average Daily Trading Volume		Closing Price Per ADS				Average Daily Trading Volume
	High		Low				High		Low
	(in Won)				(in thousands of shares)		(in US$)				(in shares)
2013		13,500		9,800		1,676		38.33		25.09		13,557
2014		14,550		10,000		1,785		42.41		27.05		4,936
2015		11,200		8,780		2,246		31.32		22.03		6,229
2016		13,350		8,230		1,698		35.70		20.25		6,570
First Quarter		9,510		8,230		1,481		24.98		20.25		3,550
Second Quarter		10,800		9,220		1,920		28.31		23.94		7,359
Third Quarter		11,800		9,430		1,691		32.22		24.34		8,106
Fourth Quarter		13,350		11,350		1,700		35.70		30.42		7,265
2017		19,550		12,300		1,631		53.50		31.18		10,268
First Quarter		13,850		12,300		1,217		37.25		31.18		4,550
Second Quarter		18,600		13,050		2,162		48.70		35.21		6,033
Third Quarter		19,550		17,050		1,640		53.50		44.49		14,494
Fourth Quarter		18,100		15,400		1,506		47.76		41.20		15,994
October		18,100		16,400		1,600		47.76		43.90		14,075
November		16,700		15,500		1,645		45.32		41.20		13,163
December		16,300		15,400		1,266		45.72		42.88		21,079
2018 (through April 20)		17,200		13,700		1,770		49.04		38.43		14,336
First Quarter		17,200		14,250		1,640		49.04		40.83		14,765
January		17,200		15,650		1,304		49.04		44.73		14,590
February		17,050		15,200		1,861		48.24		42.63		14,642
March		16,400		14,250		1,802		45.97		40.83		15,051
April (through April 20)		15,300		13,700		2,302		42.80		38.43		12,591

Source: KRX KOSPI Market; New York Stock Exchange.

⁽¹⁾  Each ADS represents the right to receive three shares of our common stock.

Item 9.B. Plan of Distribution

Not Applicable

Item 9.C. Markets

The KRX KOSPI Market, formerly known as the Stock Market Division of the Korea Exchange, began its operations in 1956. It has a single trading floor located in Seoul. The KRX KOSPI Market is a membership organization consisting of most of the Korean financial investment companies with a dealing and/or brokerage license and some Korean branches of foreign financial investment companies with such license.

As of December 31, 2017, the aggregate market value of equity securities listed on the KRX KOSPI Market was approximately ￦1,606 trillion. The average daily trading volume of equity securities for 2017 was approximately 340 million shares and the average daily transaction value was ￦5,326 billion.

The KRX KOSPI Market has the power in some circumstances to suspend trading in the shares of a given company or to de-list a security pursuant to the Listing Regulation of the KRX KOSPI Market. The KRX KOSPI Market also restricts share price movements. All listed companies are required to file accounting reports annually, semiannually and quarterly and to release immediately all information that may affect trading in a security.

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The KRX KOSPI Market publishes the KOSPI, which is an index of all equity securities listed on the KRX KOSPI Market, every 10 seconds. The method of computing KOSPI is the aggregate value method, pursuant to which the market capitalizations of all listed companies are aggregated, subject to certain adjustments, and this aggregate is expressed as a percentage of the aggregate market capitalization of all listed companies as of the base date, January 4, 1980.

The following table sets out movements in KOSPI:

Year	Opening		High		Low		Closing
1982		123.60		134.48		105.99		128.99
1983		122.52		134.46		115.59		121.21
1984		115.25		142.46		115.25		142.46
1985		139.53		163.37		131.40		163.37
1986		161.40		279.67		153.85		272.61
1987		264.82		525.11		264.82		525.11
1988		532.04		922.56		527.89		907.20
1989		919.61		1,007.77		844.75		909.72
1990		908.59		928.82		566.27		696.11
1991		679.75		763.10		586.51		610.92
1992		624.23		691.48		459.07		678.44
1993		697.41		874.10		605.93		866.18
1994		879.32		1,138.75		855.37		1,027.37
1995		1,013.57		1,016.77		847.09		882.94
1996		888.85		986.84		651.22		651.22
1997		653.79		792.29		350.68		376.31
1998		385.49		579.86		280.00		562.46
1999		587.57		1,028.07		498.42		1,028.07
2000		1,059.04		1,059.04		500.60		504.62
2001		520.95		704.50		468.76		693.70
2002		724.95		937.61		584.04		627.55
2003		635.17		822.16		515.24		810.71
2004		821.26		936.06		719.59		895.92
2005		893.71		1,379.37		870.84		1,379.37
2006		1,389.27		1,464.70		1,203.86		1,434.46
2007		1,435.26		2,064.85		1,355.79		1,897.13
2008		1,853.45		1,888.88		938.75		1,124.47
2009		1,157.40		1,718.88		1,018.81		1,682.77
2010		1,696.14		2,051.00		1,552.79		2,051.00
2011		2,070.08		2,228.96		1,652.71		1,825.74
2012		1,826.37		2,049.28		1,769.31		1,997.05
2013		2,031.10		2,059.58		1,780.63		2,011.34
2014		1,967.19		2,082.61		1,886.85		1,915.59
2015		1,926.44		2,173.41		1,829.81		1,961.31
2016		1,918.76		2,068.72		1,835.28		2,026.46
2017		2,026.16		2,557.97		2,026.16		2,467.49
2018 (through April 20)		2,479.65		2,598.19		2,363.77		2,476.33

Source: The KRX KOSPI Market

Shares are quoted “ex-dividend” on the first trading day of the relevant company’s accounting period. Since the calendar year is the accounting period for the majority of listed companies, this may account for the drop in KOSPI between its closing level at the end of one calendar year and its opening level at the beginning of the following calendar year.

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With certain exceptions, principally to take account of a share being quoted “ex-dividend” and “ex-rights,” permitted upward and downward movements in share prices of any category of shares on any day are limited under the rules of the KRX KOSPI Market to 30% of the previous day’s closing price of the shares, rounded down as set out below:

Previous Day’s Closing Price (Won)	Rounded Down To Won
Less than 1,000		1
1,000 to less than 5,000		5
5,000 to less than 10,000		10
10,000 to less than 50,000		50
50,000 to less than 100,000		100
100,000 to less than 500,000		500
500,000 or more		1,000

As a consequence, if a particular closing price is the same as the price set by the fluctuation limit, the closing price may not reflect the price at which persons would have been prepared, or would be prepared to continue, if so permitted, to buy and sell shares. Orders are executed on an auction system with priority rules to deal with competing bids and offers.

Due to deregulation of restrictions on brokerage commission rates, the brokerage commission rate on equity securities transactions may be determined by the parties, subject to commission schedules being filed with the KRX KOSPI Market by financial investment companies with a brokerage license. In addition, a securities transaction tax of 0.15% of the sales price will generally be imposed on the transfer of shares or certain securities representing rights to subscribe for shares. See “Item 3.D. Risk Factors—Risks relating to our common stock and ADSs.” An agriculture and fishery special surtax of 0.15% of the sales prices will also be imposed on transfer of these shares and securities on the KRX KOSPI Market. See “Item 10.E. Taxation—Korean Taxation.”

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The number of companies listed on the KRX KOSPI Market, the corresponding total market capitalization at the end of the periods indicated and the average daily trading volume for those periods are set forth in the following table:

	Market Capitalization on the Last Day of Each Period				Average Daily Trading Volume, Value
Year	Number of Listed Companies		(billions of ￦)		(thousands of Shares)		(millions of ￦)
1982		334	￦	3,001		9,704	￦	6,667
1983		328		3,490		9,325		5,941
1984		336		5,149		14,847		10,642
1985		342		6,570		18,925		12,315
1986		355		11,994		31,755		32,870
1987		389		26,172		20,353		70,185
1988		502		64,544		10,367		198,364
1989		626		95,477		11,757		280,967
1990		669		79,020		10,866		183,692
1991		686		73,118		14,022		214,263
1992		688		84,712		24,028		308,246
1993		693		112,665		35,130		574,048
1994		699		151,217		36,862		776,257
1995		721		141,151		26,130		487,762
1996		760		117,370		26,571		486,834
1997		776		70,989		41,525		555,759
1998		748		137,799		97,716		660,429
1999		725		349,504		278,551		3,481,620
2000		704		188,042		306,163		2,602,211
2001		689		255,850		473,241		1,997,420
2002		683		258,681		857,245		3,041,598
2003		684		355,363		542,010		2,216,636
2004		683		412,588		372,895		2,232,108
2005		702		655,075		467,629		3,157,662
2006		731		704,588		279,096		3,435,180
2007		745		951,900		363,741		5,539,653
2008		763		576,888		355,205		5,189,644
2009		770		887,935		485,657		5,795,426
2010		777		1,141,885		380,859		5,619,768
2011		791		1,041,999		353,759		6,863,146
2012		784		1,154,294		486,480		4,823,643
2013		777		1,185,974		328,325		3,993,422
2014		773		1,192,253		278,082		3,983,580
2015		770		1,242,832		455,256		5,351,734
2016		779		1,308,440		376,773		4,523,044
2017		774		1,605,821		340,457		5,325,760
2018 (through April 20)		777		1,653,176		403,020		7,089,807

Source: The KRX KOSPI Market

The Korean securities markets are principally regulated by the Financial Services Commission and the Financial Investment Services and Capital Markets Act. The Financial Investment Services and Capital Markets Act imposes restrictions on insider trading, price manipulation and deceptive action (including unfair trading), requires specified information to be made available by listed companies to investors and establishes rules

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regarding margin trading, proxy solicitation, takeover bids, acquisition of treasury shares and reporting requirements for shareholders holding substantial interests.

Protection of Customer’s Interest in Case of Insolvency of Financial Investment Companies with a Brokerage License

Under Korean law, the relationship between a customer and a financial investment company with a brokerage license in connection with a securities sell or buy order is deemed to be consignment and the securities acquired by a consignment agent (i.e., the financial investment company with a brokerage license) through such sell or buy order are regarded as belonging to the customer in so far as the customer and the consignment agent’s creditors are concerned. Therefore, in the event of a bankruptcy or reorganization procedure involving a financial investment company with a brokerage license, the customer of such financial investment company is entitled to the proceeds of the securities sold by such financial investment company.

When a customer places a sell order with a financial investment company with a brokerage license which is not a member of the KRX KOSPI Market, and such financial investment company places a sell order with another financial investment company with a brokerage license, which is a member of the KRX KOSPI Market, the customer is still entitled to the proceeds of the securities sold and received by the non-member company from the member company regardless of the bankruptcy or reorganization of the non-member company.

Under the Financial Investment Services and Capital Markets Act, the KRX KOSPI Market is obliged to indemnify any loss or damage incurred by a counterparty as a result of a breach by its members. If a financial investment company with a brokerage license that is a member of the KRX KOSPI Market breaches its obligation in connection with a buy order, the KRX KOSPI Market is obliged to pay the purchase price on behalf of the breaching member. Therefore, the customer can acquire the securities that have been ordered to be purchased by the breaching member.

When a customer places a buy order with a non-member company and the non-member company places a buy order with a member company, the customer has the legal right to the securities received by the non-member company from the member company because the purchased securities are regarded as belonging to the customer in so far as the customer and the non-member company’s creditors are concerned.

As the cash deposited with a financial investment company with a brokerage license is regarded as belonging to such financial investment company, which is liable to return the same at the request of its customer, the customer cannot take back deposited cash from such financial investment company if a bankruptcy or reorganization procedure is instituted against such financial investment company and, therefore, can suffer from loss or damage as a result. However, the Depositor Protection Act provides that the KDIC will, upon the request of the investors, pay investors an amount equal to the full amount of cash deposited with a securities company prior to August 1, 1998 in case of the securities company’s bankruptcy, liquidation, cancellation of securities business license or other insolvency events. However, this indemnification was available only until the end of 2000. From 2001, the maximum amount to be paid to each customer is limited to ￦50 million. Pursuant to the Financial Investment Services and Capital Markets Act, as amended, financial investment companies with a dealing and/or brokerage license are required to deposit the cash received from its customers to the extent the amount is not covered by the insurance with the Korea Securities Finance Corporation, a special entity established pursuant to the Financial Investment Services and Capital Markets Act. Set-off or attachment of cash deposits by such financial investment companies is prohibited. The premiums related to this insurance are paid by such financial investment companies.

Reporting Requirements for Holders of Substantial Interests

Any person who directly or beneficially owns shares of our common stock that have voting rights, whether in the form of shares, ADSs, certificates representing the rights to subscribe for shares or equity-related debt securities (including convertible bonds and bonds with warrants) (which we refer to collectively as “Equity Securities”) that, when taken together with the Equity Securities beneficially owned by specified related persons or by any person acting in concert with that person, account for 5% or more of our total issued and outstanding

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shares (plus the Equity Securities other than the shares held by such persons and treasury stock) must report that holding to the Financial Services Commission and the KRX KOSPI Market no more than five business days after reaching 5%. That person must also report any subsequent change in the ownership interest of 1% or more of our total outstanding shares (plus the Equity Securities other than the shares held by such persons) to the same entities no more than five business days after the change.

Anyone violating these reporting requirements may suffer criminal sanctions, including fines, imprisonment, an administrative fine of up to 0.001% of the aggregate market value of total issued and outstanding stock of ￦500 million, whichever is lower, and/or a loss of voting rights with respect to the ownership of Equity Securities exceeding 5% of the total issued and outstanding Equity Securities with respect to which the reporting requirements were violated. Furthermore, the Financial Services Commission may order that person to dispose of the unreported Equity Securities.

In addition to the reporting requirements described above, any person whose direct or beneficial ownership of our stock accounts for 10% or more of the total issued and outstanding stock (which we refer to as a “major shareholder”) must report the status of its shareholding to the Korea Securities Futures Commission and the KRX KOSPI Market within five days after becoming a major shareholder. In addition, the major shareholder must report any subsequent change in its ownership interest to those same entities within five days of the occurrence of the change, unless the change in the number of shares is less than 1,000 shares and the amount involved in such change is less than ￦10 million. A major shareholder that violates these reporting requirements may suffer criminal sanctions, including fines or imprisonment.

Restrictions Applicable to ADSs

An investor does not need Korean governmental approval to sell or purchase our ADSs in the secondary market outside Korea or to withdraw shares of our common stock from our ADS deposit facility or deliver those withdrawn shares in Korea. However, a foreign investor who intends to acquire shares must obtain an investment registration card from the Financial Supervisory Service as described below. Either the foreign investor or its standing proxy in Korea must immediately report its acquisition of the shares to the governor of the Financial Supervisory Service.

Persons who acquire shares of our common stock by withdrawing those shares from our ADS deposit facility may exercise their preemptive rights for new shares, participate in free distributions and receive dividends on shares without any further Korean governmental approval.

Restrictions Applicable to Shares

As a result of amendments to the Foreign Exchange Transaction Laws and Financial Services Commission regulations (which we refer to collectively as the “Investment Rules”) adopted since January 1992 in connection with the opening and operation of Korea’s stock market, foreign investors may generally invest, with limited exceptions and subject to procedural requirements, in all shares of Korean companies, whether listed on the KRX KOSPI Market or registered on the KRX KOSDAQ Market. Foreign investors may trade shares listed on the KRX KOSPI Market or registered on the KRX KOSDAQ Market only through the KRX KOSPI Market or the KRX KOSDAQ Market, except in limited circumstances. These circumstances include:

• odd-lot share trading;

• acquiring shares (which we refer to as “Converted Shares”) by exercising warrants, conversion rights or exchange rights under bonds with warrants, convertible bonds or exchangeable bonds or withdrawal rights under depositary receipts issued outside of Korea by a Korean company;

• acquiring shares through inheritance, donation, bequest or exercise of shareholders’ rights, including pre-emptive rights or rights to participate in free distributions and receive dividends;

• subject to certain exceptions, over-the-counter transactions between foreign investors of a class of shares for which the limit on aggregate acquisition by foreign investors, as explained below, has been reached or exceeded; and

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• sale and purchase of shares at fair value between foreigners who are part of an investor group comprised of foreign companies investing under the control of a common investment manager pursuant to applicable laws or contract.

For over-the-counter transactions between foreign investors outside the KRX KOSPI Market or the KRX KOSDAQ Market involving a class of shares for which the limit on aggregate acquisition by foreign investors has been reached or exceeded, a financial investment company with a brokerage license in Korea must act as an intermediary. Odd-lot trading of shares outside the KRX KOSPI Market or the KRX KOSDAQ Market must involve a financial investment company with a dealing license in Korea as the other party. Foreign investors may not engage in margin transactions by borrowing shares from financial investment companies with a dealing and/or brokerage license with respect to shares that are subject to a foreign ownership limit.

The Investment Rules require a foreign investor who wishes to invest in shares on the KRX KOSPI Market or the KRX KOSDAQ Market (including Converted Shares and shares being issued for initial listing on the KRX KOSPI Market or registration on the KRX KOSDAQ Market) to register with the Financial Supervisory Service before making an investment. This registration requirement does not apply to foreign investors who acquire Converted Shares with the intention of selling the Converted Shares within three months from the acquisition date. The Financial Supervisory Service will issue an investment registration card to each registering foreign investor. This card must be presented each time the foreign investor opens a brokerage account with a financial investment company with a brokerage license. Foreign investors eligible to obtain an investment registration card include:

• foreign nationals who have not been residing in Korea for a consecutive period of six months or more;

• foreign governments;

• foreign municipal authorities;

• foreign public institutions;

• international financial institutions or similar international organizations;

• corporations incorporated under foreign laws; and

• any person in any additional category designated under the Enforcement Decree of the Financial Investment Services and Capital Markets Act.

All Korean offices of a foreign corporation (as a group) are treated as a separate foreign investor from the offices of the corporation outside Korea for these purposes. However, a foreign corporation or depositary issuing depositary receipts may obtain one or more investment registration cards in its name in certain circumstances identified in the relevant regulations.

When a foreign investor purchases shares through the KRX KOSPI Market or the KRX KOSDAQ Market, it need not make a separate report because the investment registration card system is designed to control and oversee foreign investment through a computer system. If, however, a foreign investor acquires or sells shares outside the KRX KOSPI Market or the KRX KOSDAQ Market, that investor or its standing proxy must report that transaction to the governor of the Financial Supervisory Service at that time. In addition, if a foreign investor acquires or sells its shares in connection with a tender offer, odd-lot trading of shares or trades of a class of shares for which the aggregate foreign ownership limit has been reached or exceeded, that investor or its standing proxy must ensure that the financial investment company engaged to facilitate the transaction reports the transaction to the governor of the Financial Supervisory Service. Also, sale and purchase of shares at fair value between foreigners who are part of an investor group comprised of foreign companies investing under the common control of a common investment manager pursuant to applicable laws or contract are required to be reported to the governor of the Financial Supervisory Service. A foreign investor may appoint a standing proxy to exercise shareholders’ rights or perform any matters related to the foregoing activities if that investor does not perform these activities itself. A foreign investor may be exempted from complying with the standing proxy rules with the approval of the governor of the Financial Supervisory Service in cases deemed unavoidable by reason of conflict between laws of Korea and the home country of the foreign investor.

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Certificates evidencing shares of Korean companies must be kept in the custody of an eligible custodian in Korea. The same entities eligible to act as a standing proxy are eligible to act as a custodian of shares for a non-resident or foreign investor. A foreign investor must ensure that its custodian deposits its shares with the Korea Securities Depository. A foreign investor may be exempted from complying with this deposit requirement with the approval of the governor of the Financial Supervisory Service in circumstances where compliance with that requirement is made impracticable, including cases where compliance would contravene the laws of the foreign investors’ home country.

Under the Investment Rules, with certain limitations, foreign investors may acquire shares of a Korean company without being subject to any foreign investment limit. Under one of these limitations, foreign investors may acquire no more than 40% of the outstanding share capital of designated public corporations. In addition, designated public corporations may set a limit on the acquisition of shares by a single person in their articles of incorporation. If a foreign investor acquires 10% or more of the outstanding shares with voting rights of a Korean company, that investment constitutes a “foreign direct investment” under the Foreign Investment Promotion Act of Korea. Generally, a foreign direct investment must be reported to the Ministry of Trade, Industry and Energy of Korea. The acquisition of a Korean company’s shares by a foreign investor may be subject to certain foreign or other shareholding restrictions in the event that the restrictions are prescribed in a specific law that regulates the business of the Korean company. For a description of the restrictions applicable to Korean banks, see “Item 4.B. Business Overview—Supervision and Regulation—Principal Regulations Applicable to Banks.”

Under the Foreign Exchange Transaction Laws, a foreign investor who intends to acquire shares must designate a foreign exchange bank at which he must open a foreign currency account and a Won account exclusively for stock investments. Approval is not required for remittance into Korea and deposit of foreign currency funds in the foreign currency account. Foreign currency funds may be transferred from the foreign currency account at the time required to place a deposit for, or settle the purchase price of, a stock purchase transaction to a Won account opened at a financial investment company with a dealing and/or brokerage license. Funds in the foreign currency account may be remitted abroad without any Korean governmental approval.

Dividends on shares of Korean companies are paid in Won. Korean governmental approval is not required for foreign investors to receive dividends on, or the Won proceeds from the sale of, any shares to be paid, received and retained in Korea. Dividends paid on, and the Won proceeds of the sale of, any shares held by a non-resident of Korea must be deposited either in a Won account with the investor’s financial investment company with a dealing and/or brokerage license or in its own Won account. Funds in a foreign investor’s Won account may be transferred to its foreign currency account or withdrawn for local living expenses up to certain limits. These funds may also be used to make future investments in shares or to pay the subscription price of new shares obtained through the exercise of pre-emptive rights.

Financial investment companies with a dealing or brokerage license may open foreign currency accounts with foreign exchange banks exclusively to accommodate foreign investors’ stock investments in Korea. Through these accounts, financial investment companies with a dealing or brokerage license may enter into limited foreign exchange transactions, such as converting foreign currency funds and Won funds, either as a counterparty to or on behalf of foreign investors, without the investors having to open their own accounts with foreign exchange banks.

Item 9.D. Selling Shareholders

Not Applicable

Item 9.E. Dilution

Not Applicable

Item 9.F. Expenses of the Issuer

Not Applicable

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Item 10. ADDITIONAL INFORMATION

Item 10.A. Share Capital

Not Applicable

Item 10.B. Memorandum and Articles of Association

Description of Capital Stock

We have set forth below information relating to our capital stock, including brief summaries of some of the provisions of our articles of incorporation, the Korean Commercial Code, Financial Investment Services and Capital Markets Act, and other related laws of Korea. These summaries do not purport to be complete and are subject to our articles of incorporation, and the applicable provisions of the Financial Investment Services and Capital Markets Act, the Korean Commercial Code and those related laws.

Our authorized share capital is 5,000,000,000 shares. Our articles of incorporation authorize us to issue:

• shares of common stock, par value ￦5,000 per share;

• “class shares,” par value ￦5,000 per share.

Subject to applicable laws and regulations, our articles of incorporation authorize us to issue a number of “class shares” equal to as much as one-half of all of the issued and outstanding shares.

As of the date of this annual report, 676,000,000 shares of common stock were issued and 673,271,226 shares of common stock were outstanding. Pursuant to our articles of incorporation, which was last amended on March 24, 2017, we are authorized to issue various types of “class shares,” which include shares of voting and non-voting preferred stock, convertible stock, redeemable preferred stock and hybrid securities comprising one or more elements of the foregoing types of shares. There are no class shares currently outstanding. All of the issued and outstanding shares are fully paid and non-assessable and are in registered form. As of the date of this annual report, our authorized but unissued share capital was 4,324,000,000 shares. We may issue the unissued shares without further shareholder approval, but these issuances are subject to a board resolution as provided in the articles of incorporation. See “—Pre-emptive Rights and Issuances of Additional Shares” and “—Dividends and Other Distributions—Distribution of Free Shares.” For a discussion of the history of our share capital, see Note 28 of the notes to our consolidated financial statements and “Item 4.A. History and Development of the Company—History—Establishment of Woori Finance Holdings” and “—Privatization Plan—Merger with Woori Finance Holdings.”

Our articles of incorporation allow our shareholders, by special resolution, to grant to our officers, directors and employees stock options exercisable for up to 15% of the total number of our issued and outstanding shares. Our board of directors may also grant stock options exercisable for up to 1% of our issued and outstanding shares. However, any grant by our board of directors must be approved by our shareholders at their next general meeting convened immediately after the grant date. As of December 31, 2017, our officers, directors and employees did not hold any options to purchase shares of common stock. See “Item 6.E. Share Ownership.”

We issue share certificates in denominations of one, five, ten, 50, 100, 500, 1,000 and 10,000 shares.

Organization

We are a bank established under the Bank Act. We were originally established on January 30, 1899 and incorporated under the laws of Korea on June 19, 1911. We are registered with the commercial registry office of Seoul District Court.

Interests of Directors

Our articles of incorporation provide that any director who has a material interest in the subject matter of a resolution to be taken by the board of directors cannot vote on such resolution. Our articles of incorporation also provide that the remuneration of our directors is to be determined by the resolution of the general meeting of shareholders.

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Our articles of incorporation do not contain any special provisions with respect to the borrowing powers exercisable by directors, their retirement age or a requirement to hold any shares of our capital stock.

See “Item 6.C. Board Practices” for more information on our directors.

Limitation on Liability of Directors

Our articles of incorporation provide that we may, upon the resolution of the general meeting of shareholders, limit the liability of our directors (in their capacity as such) to an amount not less than six times (or three times in case of outside directors) the aggregate amount of the remuneration we paid to such directors during the most recent one-year period, provided that such limitation shall not apply with regard to any liability arising from such directors’ gross negligence, willful misconduct or violation of their duties regarding self-dealing or corporate opportunity.

Dividends and Other Distributions

Dividends.  We distribute dividends to shareholders in proportion to the number of shares of the relevant class of capital stock they own. Subject to the requirements of the Korean Commercial Code and other applicable laws and regulations, we expect to pay full annual dividends on newly issued stock for the year in which it is issued.

We declare our dividend annually at the annual general meeting of shareholders. We generally hold this meeting within three months after the end of each fiscal year. We must pay the annual dividend to the shareholders of record as of the end of the preceding fiscal year within one month after that meeting. We can distribute the annual dividend in (i) cash, (ii) shares, provided that such shares must be distributed at par value and, if the market price of the shares is less than their par value, dividends in shares may not exceed one-half of the total annual dividend (including dividends in shares) or (iii) other forms of consideration. In addition, we may declare, and distribute in cash, interim dividends once a year pursuant to a board resolution.

Under the Korean Commercial Code and our articles of incorporation, we do not have an obligation to pay any annual or interim dividend unclaimed for five years from the payment date.

For information regarding taxation of dividends, see “Item 10.E. Taxation—United States Taxation—Dividends” and “—Korean Taxation—Taxation of Dividends on Common Shares or ADSs.”

Distribution of Free Shares.  The Korean Commercial Code permits us to pay dividends in the form of shares out of retained or current earnings. It also permits us to distribute to our shareholders, in the form of free shares, an amount transferred from the capital surplus or legal reserve. We would be required to distribute those free shares pro rata to all shareholders.

Pre-emptive Rights and Issuances of Additional Shares

We may issue authorized but unissued shares as our board of directors may determine, unless otherwise provided in the Korean Commercial Code. We must, however, offer any new shares on uniform terms to all shareholders who have preemptive rights and are listed on our shareholders’ register as of the applicable record date. Those shareholders are entitled to subscribe for any newly issued shares in proportion to their existing shareholdings. Our articles of incorporation provide, however, that we may issue new shares to persons other than existing shareholders if those shares are:

• publicly offered pursuant to Article 165-6 of the Financial Investment Services and Capital Markets Act (where the number of shares so offered may not exceed 50% of our total number of issued shares);

• issued to directors or employees as a result of the exercise of stock options we granted to them pursuant to Article 542-3 of the Korean Commercial Code;

• issued to the members of our employee stock ownership association pursuant to Article 165-7 of the Financial Investment Services and Capital Markets Act;

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• issued to specified foreign investors or foreign or domestic financial institutions for managerial needs, strategic technology alliances, emergency financing or debt-to-equity swaps by those financial institutions (where the number of shares so offered may not exceed 50% of our total number of issued shares); or

• issued to a depositary for the purpose of issuing depositary receipts pursuant to Financial Investment Services and Capital Markets Act (where the number of shares so offered may not exceed 50% of our total number of issued shares).

We must give public notice of pre-emptive rights for new shares and their transferability not less than two weeks before the record date (excluding the period during which the shareholders’ register is closed). We will notify the shareholders who are entitled to subscribe for newly issued shares of the deadline for subscription at least two weeks prior to the deadline. If a shareholder fails to subscribe on or before the deadline, its pre-emptive rights will lapse. Our board of directors may determine how to distribute shares in respect of which preemptive rights have not been exercised or where fractions of shares occur.

Under the Financial Investment Services and Capital Markets Act, each member of our employee stock ownership association, whether or not they are shareholders, has a preemptive right, subject to certain exceptions, to subscribe for up to 20% of any shares we publicly offer. This right is exercisable only so long as the total number of shares so acquired and held by the member does not exceed 20% of the total number of shares then outstanding. As of December 31, 2017, our employees owned 5.36% of our common stock through the employee stock ownership association.

In addition, our articles of incorporation permit us to issue convertible bonds or bonds with warrants, each up to an aggregate principal amount of ￦1 trillion, to persons other than existing shareholders. Under the Korean Commercial Code, we are permitted to distribute convertible bonds or bonds with warrants to persons other than existing shareholders only when we deem that this distribution is necessary for managerial purposes, such as obtaining new technology or improving our financial condition. In the event we issue new shares, the foregoing provision would be applicable notwithstanding any provision in the articles of incorporation allowing issuance of new shares to persons other than existing shareholders. As of December 31, 2017, we had no convertible bonds or bonds with warrants outstanding.

Voting Rights

Each outstanding share of our common stock is entitled to one vote per share. However, voting rights with respect to shares of common stock that we hold or any of our subsidiaries holds may not be exercised. Unless stated otherwise in a company’s articles of incorporation, the Korean Commercial Code permits holders of an aggregate of 1% or more of the issued and outstanding shares with voting rights to request cumulative voting when electing two or more directors.

The Korean Commercial Code and our articles of incorporation provide that an ordinary resolution may be adopted if approval is obtained from the holders of at least a majority of those shares of common stock present or represented at a meeting and such majority also represents at least one-fourth of the total of our issued and outstanding voting shares. Holders of non-voting shares (other than enfranchised non-voting shares) will not be entitled to vote on any resolution or to receive notice of any general meeting of shareholders, unless the meeting agenda includes consideration of a resolution on which such holders are entitled to vote. The Korean Commercial Code provides that a company’s articles of incorporation may prescribe conditions for the enfranchisement of non-voting shares. For example, if our annual general shareholders’ meeting resolves not to pay to holders of non-voting shares with preferred dividend the annual dividend as determined by the board of directors at the time of issuance of such shares, the holders of non-voting shares with preferred dividend will be entitled to exercise voting rights from the general shareholders’ meeting following the meeting adopting such resolution to the end of a meeting to declare to pay such dividend with respect to the non-voting shares with preferred dividend. Holders of such enfranchised non-voting shares with preferred dividend will have the same rights as holders of common stock to request, receive notice of, attend and vote at a general meeting of shareholders.

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The Korean Commercial Code provides that the holders of at least two-thirds of those shares present or represented at a meeting must approve the adoption of a special resolution, and the special majority must represent at least one-third of the total issued and outstanding shares with voting rights of the company. Special resolutions are required to:

• amend the articles of incorporation;

• change the authorized share capital of the company;

• remove a director;

• dissolve, merge or consolidate us;

• transfer of the whole or a significant part of our business;

• acquire all of the business of another company;

• acquire a part of the business of another company that has a material effect on our business of the company; and

• issue new shares at a price lower than their par value.

In addition, in the case of amendments to the articles of incorporation or any merger or consolidation of a company or in certain other cases, where the rights or interests of the holders of class shares are adversely affected, a resolution must be adopted by a separate meeting of holders of class shares. Such a resolution may be adopted if the approval is obtained from shareholders of at least two-thirds of the class shares present or represented at such meeting and such shares also represent at least one-third of the total issued and outstanding class shares.

A shareholder may exercise his voting rights by proxy given to another person. The proxy must present the power of attorney before the start of a meeting of shareholders.

Liquidation Rights

If we are liquidated, the assets remaining after the payment of all our debts, liquidation expenses and taxes will be distributed to shareholders in proportion to the number of shares they hold. Holders of class shares have no preferences in liquidation.

General Meetings of Shareholders

There are two types of general meetings of shareholders: annual general meetings and extraordinary general meetings. We are required to convene our annual general meeting within three months after the end of each fiscal year. Subject to a board resolution or court approval, an extraordinary general meeting of shareholders may be held:

• when we deem one necessary;

• at the request of the holders of an aggregate of 3% or more of our outstanding shares;

• at the request of the holders of an aggregate of 0.75% or more of our outstanding shares with voting rights who have held those shares for at least six months pursuant to the Act on the Corporate Governance of Financial Institutions and the regulations thereunder; or

• at the request of our Audit Committee.

Holders of non-voting shares are entitled to request a general meeting only if their non-voting shares have become enfranchised. Meeting agendas will be determined by our board of directors or proposed by holders of an aggregate of 3% or more of our outstanding shares with voting rights or by holders of an aggregate of 1.0% or more of those shares who have held those shares for at least six months by way of a written proposal to our board of directors at least six weeks before the meeting pursuant to the Act on the Corporate Governance of Financial

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Institutions and the regulations thereunder. We must give shareholders written notices or e-mail notices stating the date, place and agenda of the meeting at least two weeks before the date of the meeting. However, we may give notice to holders of 1% or less of the total number of issued and outstanding shares that are entitled to vote by placing at least two public notices at least two weeks in advance of the meeting in at least two daily newspapers. Shareholders who are not on the shareholders’ register as of the record date will not be entitled to receive notice of the general meeting of shareholders or to attend or vote at the meeting. Unless their non-voting shares have been enfranchised, holders of non-voting shares are not entitled to receive notice of or vote at general meetings of shareholders. Holders of enfranchised non-voting shares who are on the shareholders’ register as of the record date will be entitled to receive notice of the general meeting of shareholders and to attend and vote at the meeting.

We will generally hold our general meeting of shareholders at our head office, which is our registered head office. If necessary, we may hold the meeting anywhere in the vicinity of our head office.

Rights of Dissenting Shareholders

Pursuant to the Financial Investment Services and Capital Markets Act and the Law on the Improvement of the Structure of the Financial Industry, in certain limited circumstances dissenting holders of shares of our common stock and our class shares will have the right to require us to purchase their shares. These circumstances include:

• if we transfer all or any significant part of our business;

• if we acquire a part of the business of any other company and the acquisition has a material effect on our business; or

• if we merge or consolidate with another company.

To exercise this right, shareholders must submit to us a written notice of their intention to dissent prior to the general meeting of shareholders called to approve the transaction in question. Within 20 days (or 10 days, in the case of a merger or consolidation under the Law on Improvement of the Structure of the Financial Industry) after the date on which shareholders pass the relevant resolution at the general meeting, the dissenting shareholders must request in writing that we purchase their shares. We must purchase those shares within one month after the end of the request period (within two months after the receipt of the request in the case of a merger or consolidation under the Law on Improvement of the Structure of Financial Industry) at a negotiated price. If we cannot agree with the shareholder on a purchase price through negotiations, the price will be the arithmetic mean of the weighted average of the daily stock prices on the KRX KOSPI Market for:

• the two-month period prior to the date the relevant board of directors’ resolution was adopted;

• the one-month period prior to the date the relevant board of directors’ resolution was adopted; and

• the one-week period prior to the date the relevant board of directors’ resolution was adopted.

Pursuant to the Financial Investment Services and Capital Markets Act, if we or the dissenting shareholders do not accept the purchase price, either party may bring a claim in court.

In the case of a merger or consolidation pursuant to the Law on the Improvement of the Structure of Financial Industry where the Korean government or the KDIC provides financial support, procedures different from those in the case of a merger or consolidation pursuant to the Financial Investment Services and Capital Markets Act will apply. For example, if the relevant parties cannot agree on a purchase price, the price will be determined by an accounting expert and not by the Financial Services Commission. However, a court may adjust this price if we or holders of at least 30% of the shares we must purchase do not accept the purchase price determined by the accounting expert and request an adjustment no later than 30 days from the date of the determination of the purchase price.

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Required Disclosure of Ownership

Under Korean and U.S. law, shareholders who beneficially hold more than a certain percentage of our common stock, or who are related to or are acting in concert with other holders of certain percentages of our common stock or our other equity securities, must report their holdings to various governmental authorities. For a description of the required disclosure of ownership, see “Item 9.C. Markets—Reporting Requirements for Holders of Substantial Interests” and “Item 4.B. Business Overview—Supervision and Regulation—Principal Regulations Applicable to Banks—Restriction on Bank Ownership.”

Other Provisions

Record Date.  The record date for annual dividends is December 31. For the purpose of determining the holders of shares entitled to annual dividends, we may close the register of our shareholders for the period from January 1 until January 31. Further, the Korean Commercial Code and our articles of incorporation permit us, upon at least two weeks’ public notice, to set a record date and/or close the register of shareholders for not more than three months for the purpose of determining the shareholders entitled to certain rights pertaining to the shares. The trading of shares and the related delivery of share certificates may continue while the register of shareholders is closed.

Annual and Interim Reports.  At least one week before the annual general meeting of shareholders, we must make our annual report and audited financial statements available for inspection at our head office and at all of our branch offices. We must make copies of our annual reports, our audited financial statements and any resolutions adopted at the general meeting of shareholders available to our shareholders.

Under the Financial Investment Services and Capital Markets Act, we must file with the Financial Services Commission and the KRX KOSPI Market:

• an annual report within 90 days after the end of each fiscal year;

• a half-year report within 45 days after the end of the first six months of each fiscal year; and

• quarterly reports within 45 days after the end of the first three months and nine months of each fiscal year.

Copies of these reports will be available for public inspection at the Financial Services Commission and the KRX KOSPI Market.

Transfer of Shares.  Under the Korean Commercial Code, share transfers are effected by the delivery of share certificates. The Financial Investment Services and Capital Markets Act provides, however, that in case of a company listed on the KRX KOSPI Market (like us), share transfers can be effected using a book-entry system. The transferee must have its name and address registered on our register of shareholders in order to assert its shareholder’s rights. For this purpose, shareholders must file their name, address and seal with us. Non-resident shareholders must tell us the name of their proxy in Korea to which we can send notices. Under current Korean regulations, the following entities may act as agents and provide related services for foreign shareholders:

• the Korea Securities Depository;

• internationally recognized foreign custodians;

• financial investment companies with a dealing license (including domestic branches of foreign financial investment companies with such license);

• financial investment companies with a brokerage license (including domestic branches of foreign financial investment companies with such license);

• foreign exchange banks (including domestic branches of foreign banks); and

• financial investment companies with a collective investment license (including domestic branches of foreign financial investment companies with such license).

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Foreign shareholders may appoint a standing proxy from the foregoing and generally may not allow any person other than the standing proxy to exercise rights to the acquired shares or perform any tasks related thereto on their behalf.

Foreign exchange controls and securities regulations apply to the transfer of shares by non-residents or non-Koreans. See “Item 9.C. Markets.”

Except as provided in the Bank Act, the maximum aggregate shareholdings of a single shareholder or a person in a “special relationship” with any shareholder is 10% of our issued and outstanding voting shares. See “Item 4.B. Business Overview—Supervision and Regulation—Principal Regulations Applicable to Banks—Restriction on Bank Ownership.”

Our Acquisition of Our Shares.  Under the Korean Commercial Code, we may acquire shares of our own capital stock under our name and for our own account upon a resolution of the general meeting of shareholders by either (i) purchasing such shares on the applicable stock exchange with respect to marketable securities traded on such stock exchange or (ii) purchasing shares, other than any redeemable shares as defined in Article 345, Paragraph (1) of the Korean Commercial Code, from each shareholder in proportion to their existing shareholding ratio through the methods set forth in the Enforcement Decree under Article 345, Paragraph (1) of the Korean Commercial Code, provided that the total purchase price may not exceed the amount of our profit that may be distributed as dividends for the immediately preceding fiscal year.

In addition, pursuant to the Financial Investment Services and Capital Markets Act and after submission of certain reports to the Financial Services Commission, we may purchase our own capital stock on the KRX KOSPI Market or through a tender offer. We may also acquire interests in our capital stock through agreements with trust companies, securities investment companies or investment trust management companies. The aggregate purchase price of our capital stock may not exceed the total amount available for distribution of dividends at the end of the preceding fiscal year.

In general, subsidiaries of which we own 50% or more are not permitted to acquire our capital stock.

Item 10.C. Material Contracts

In connection with our receipt of public funds, we entered into a memorandum of understanding with the KDIC, which was terminated in December 2016. See “Item 4.A. History and Development of the Company—History—Memoranda of Understanding.”

In December 2016, in connection with the KDIC’s sale of shares of our common stock, we entered into an agreement with the KDIC, which we refer to as the KDIC Agreement. Pursuant to the KDIC Agreement, we are required to use our best efforts to cause an employee of the KDIC nominated by it to be appointed as one of our non-standing directors, so long as the KDIC either (x) owns 10% or more of our total issued shares with voting rights or (y) owns more than 4% but less than 10% of our total issued shares with voting rights and remains our largest shareholder (other than the National Pension Service of Korea). In addition, pursuant to the KDIC Agreement, we are required to use our best efforts to cause such non-standing director nominated by the KDIC to be appointed as a member of the Compensation Committee under our board of directors, so long as the KDIC owns 10% or more of our total issued shares with voting rights. Furthermore, so long as the KDIC owns 4% or more of our total issued shares with voting rights, the KDIC Agreement requires us to provide certain information in advance to the KDIC, including the agenda and minutes for meetings of our board of directors, information regarding our retained earnings available for distribution of dividends, and information regarding matters that may have a material effect on the KDIC’s remaining share ownership interest in us, such as capital increases or decreases, our conversion to a holding company structure, changes in our corporate governance, changes in the lines of business of our subsidiaries and material dispositions or acquisitions of assets. The KDIC Agreement will automatically terminate if the KDIC ceases to own 4% or more of our total issued shares with voting rights.

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Item 10.D. Exchange Controls

General

The Foreign Exchange Transaction Act of Korea and the Enforcement Decree and regulations under that Act regulate investment in Korean securities by non-residents and issuance of securities outside Korea by Korean companies. We collectively refer to these laws and regulations as the “Foreign Exchange Transaction Laws.” Non-residents may invest in Korean securities only to the extent specifically allowed by the Foreign Exchange Transaction Laws or otherwise permitted by the Ministry of Strategy and Finance. The Financial Services Commission has also adopted regulations that restrict foreign investment in Korean securities and regulate the issuance of securities outside Korea by Korean companies, pursuant to its authority under the Financial Investment Services and Capital Markets Act.

Under the Foreign Exchange Transaction Laws, if the Korean government deems that:

• the need to do so is inevitable due to the outbreak of natural calamities, wars, conflict of arms or grave and sudden changes in domestic or foreign economic circumstances or other similar situations, the Ministry of Strategy and Finance may temporarily suspend payment, receipt or the whole or part of transactions to which the Foreign Exchange Transaction Laws apply, or impose an obligation to safe-keep, deposit or sell means of payment in or to certain Korean governmental agencies or financial institutions; and

• international balance of payments and international finance are confronted or are likely to be confronted with serious difficulty or the movement of capital between Korea and abroad brings or is likely to bring about serious obstacles in carrying out its currency policies, exchange rate policies and other macroeconomic policies, the Ministry of Strategy and Finance may take measures to require any person who intends to perform capital transactions to obtain permission or to require any person who performs capital transactions to deposit part of the payments received in these transactions at certain Korean governmental agencies or financial institutions.

Both of these actions are subject to limitations specified by the Foreign Exchange Transaction Laws.

Restrictions Applicable to Shares

Under the Foreign Exchange Transaction Laws, a foreign investor who intends to acquire shares must designate a foreign exchange bank at which he or she must open a foreign currency account and a Won account exclusively for stock investments. Approval is not required for remittance into Korea and deposit of foreign currency funds in the foreign currency account. Foreign currency funds may be transferred from the foreign currency account at the time required to place a deposit for, or settle the purchase price of, a stock purchase transaction to a Won account opened at a financial investment company with a dealing and/or brokerage license. Funds in the foreign currency account may be remitted abroad without any Korean governmental approval.

Dividends on shares of Korean companies are paid in Won. Korean governmental approval is not required for foreign investors to receive dividends on, or the Won proceeds from the sale of, any shares to be paid, received and retained in Korea. Dividends paid on, and the Won proceeds of the sale of, any shares held by a non-resident of Korea must be deposited either in a Won account with the investor’s financial investment company with a dealing and/or brokerage license or in its own Won account. Funds in a foreign investor’s Won account may be transferred to its foreign currency account or withdrawn for local living expenses up to certain limits. These funds may also be used to make future investments in shares or to pay the subscription price of new shares obtained through the exercise of pre-emptive rights.

Financial investment companies with a dealing and/or brokerage license may open foreign currency accounts with foreign exchange banks exclusively to accommodate foreign investors’ stock investments in Korea. Through these accounts, such financial investment companies may enter into limited foreign exchange transactions, such as converting foreign currency funds and Won funds, either as a counterparty to or on behalf of foreign investors, without the investors having to open their own accounts with foreign exchange banks.

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Item 10.E. Taxation

The following summary is based upon tax laws, regulations, rulings, decrees, income tax conventions (treaties), administrative practice and judicial decisions of Korea and the United States as of the date of this annual report, and is subject to any change in the laws of Korea or the United States that may come into effect after such date.

United States Taxation

This summary describes certain material U.S. federal income tax consequences for a U.S. holder (as defined below) of acquiring, owning, and disposing of common shares or ADSs. This summary applies to you only if you hold the common shares or ADSs as capital assets for tax purposes. This summary does not apply to you if you are a member of a class of holders subject to special rules, such as:

• a dealer in securities or currencies;

• a trader in securities that elects to use a mark-to-market method of accounting for securities holdings;

• a bank or financial institution;

• a life insurance company;

• a tax-exempt organization;

• an entity treated as a partnership or other passthrough entity (or investors therein) for U.S. federal income tax purposes;

• a person that holds common shares or ADSs that are a hedge or that are hedged against interest rate or currency risks;

• a person that holds common shares or ADSs as part of a straddle or conversion transaction for tax purposes;

• a person whose functional currency for tax purposes is not the U.S. dollar; or

• a person that owns or is deemed to own 10% or more of our stock, measured by voting power or value.

In addition, this summary does not discuss the application of the U.S. federal estate and gift taxes, the Medicare net investment income tax or the alternative minimum tax, or any state, local or other tax consequences of purchasing, owning, and disposing of common shares or ADSs. You should consult your own tax advisers concerning the U.S. federal, state, local, and other tax consequences of purchasing, owning, and disposing of common shares or ADSs in your particular circumstances.

This summary is based on the Internal Revenue Code of 1986, as amended, its legislative history, existing and proposed regulations promulgated thereunder, and published rulings and court decisions, all as currently in effect. These laws are subject to change, possibly on a retroactive basis.

For purposes of this summary, you are a “U.S. holder” if you are the beneficial owner of a common share or an ADS and are:

• a citizen or resident of the United States;

• a U.S. domestic corporation; or

• otherwise subject to U.S. federal income tax on a net income basis with respect to income from the common share or ADS.

In general, if you are the beneficial owner of ADSs, you will be treated as the beneficial owner of the common shares represented by those ADSs for U.S. federal income tax purposes, and no gain or loss will be recognized if you exchange an ADS for the common share represented by that ADS.

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Dividends

The gross amount of cash dividends that you receive (prior to deduction of Korean taxes) generally will be subject to U.S. federal income taxation as foreign source dividend income and will not be eligible for the dividends received deduction. Dividends paid in Won will be included in your income in a U.S. dollar amount calculated by reference to the exchange rate in effect on the date that you receive the dividend (or the depositary receives the dividend, in the case of ADSs), regardless of whether the payment is in fact converted into U.S. dollars. If such a dividend is converted into U.S. dollars on the date of receipt, you generally should not be required to recognize foreign currency gain or loss in respect of the dividend income.

Subject to certain exceptions for short-term and hedged positions, the U.S. dollar amount of dividends received by an individual with respect to the ADSs will be subject to taxation at reduced rates if the dividends are “qualified dividends.” Dividends paid on the common shares or ADSs will be treated as qualified dividends if (i) the common shares or ADSs are readily tradable on an established securities market in the United States or we are eligible for the benefits of a comprehensive tax treaty with the United States that the U.S. Treasury determines is satisfactory for purposes of this provision and that includes an exchange of information program; and (ii) we were not, in the year prior to the year in which the dividend was paid, and are not, in the year in which the dividend is paid, a passive foreign investment company as defined for U.S. federal income tax purposes, which we refer to as a PFIC. The ADSs are listed on the New York Stock Exchange, and will qualify as readily tradable on an established securities market in the United States so long as they are so listed. In addition, the U.S. Treasury has determined that the Korea-United States income tax treaty meets the requirements for reduced rates of taxation, and we believe we are eligible for the benefits of that treaty. Based on our audited financial statements, we believe that we were not a PFIC in our 2017 taxable year. In addition, based on our current expectations regarding our income, assets and activities, we do not anticipate becoming a PFIC for our 2018 taxable year. Therefore, we believe that dividends received by U.S. holders with respect to either common shares or ADSs will be “qualified dividends.” Holders should consult their own tax advisers regarding the availability of the reduced dividend tax rate in light of their own particular circumstances.

Distributions of additional shares in respect of common shares or ADSs that are made as part of a pro-rata distribution to all of our shareholders generally will not be subject to U.S. federal income tax.

Sale or Other Disposition

For U.S. federal income tax purposes, gain or loss you realize on a sale or other disposition of common shares or ADSs generally will be treated as U.S. source capital gain or loss, and will be long-term capital gain or loss if the common shares or ADSs were held for more than one year. Your ability to offset capital losses against ordinary income is limited. Long-term capital gain recognized by an individual U.S. holder generally is subject to taxation at reduced rates.

If a U.S. holder sells or otherwise disposes of our common shares or ADSs in exchange for currency other than U.S. dollars, the amount realized generally will be the U.S. dollar value of the currency received at the spot rate on the date of sale or other disposition (or, if the shares are traded on an established securities market at such time, in the case of cash basis and electing accrual basis U.S. holders, the settlement date). An accrual basis U.S. holder that does not elect to determine the amount realized using the spot exchange rate on the settlement date will recognize foreign currency gain or loss equal to the difference between the U.S. dollar value of the amount received based on the spot exchange rates in effect on the date of the sale or other disposition and the settlement date. If an accrual basis U.S. holder makes the election described in the first sentence of this paragraph, it must be applied consistently from year to year and cannot be revoked without the consent of the Internal Revenue Service. A U.S. holder should consult its own tax advisors regarding the treatment of any foreign currency gain or loss realized with respect to any currency received in a sale or other disposition of the common shares or ADSs.

Foreign Tax Credit Considerations

You should consult your own tax advisers to determine whether you are subject to any special rules that limit your ability to make effective use of foreign tax credits. If no such rules apply, you may claim a credit

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against your U.S. federal income tax liability for Korean taxes withheld from dividends on the common shares or ADSs at the rate provided for under the income tax treaty between the United States and Korea, so long as you have owned the common shares or ADSs (and not entered into specified kinds of hedging transactions) for at least a 16-day period that includes the ex-dividend date. Instead of claiming a credit, you may, if you so elect, deduct such Korean taxes in computing your taxable income, subject to generally applicable limitations under U.S. tax law. Korean taxes withheld from a distribution of additional shares that is not subject to U.S. tax may be treated for U.S. federal income tax purposes as imposed on “general category” income. Such treatment could affect your ability to utilize any available foreign tax credit in respect of such taxes.

Any Korean securities transaction tax or agriculture and fishery special surtax that you pay will not be creditable for foreign tax credit purposes.

Similarly, a U.S. holder will not be able to claim a foreign tax credit against its U.S. federal income tax liability for any Korean inheritance or gift tax imposed in respect of the common shares or ADSs.

Foreign tax credits will not be allowed for withholding taxes imposed in respect of certain short-term or hedged positions in securities and may not be allowed in respect of arrangements in which a U.S. holder’s expected economic profit is insubstantial.

The calculation of foreign tax credits and, in the case of a U.S. holder that elects to deduct foreign taxes, the availability of deductions involve the application of complex rules that depend on a U.S. holder’s particular circumstances. You should consult your own tax advisers regarding the creditability or deductibility of such taxes.

Specified Foreign Financial Assets

Certain U.S. holders that own “specified foreign financial assets” with an aggregate value in excess of 50,000 U.S. dollars are generally required to file an information statement along with their tax returns, currently on Form 8938, with respect to such assets. “Specified foreign financial assets” include any financial accounts held at a non-U.S. financial institution, as well as securities issued by a non-U.S. issuer (which would include the common shares and ADSs) that are not held in accounts maintained by financial institutions. Higher reporting thresholds apply to certain individuals living abroad and to certain married individuals. Regulations extend this reporting requirement to certain entities that are treated as formed or availed of to hold direct or indirect interests in specified foreign financial assets based on certain objective criteria. U.S. holders who fail to report the required information could be subject to substantial penalties. In addition, the statute of limitations for assessment of tax would be suspended, in whole or part. Prospective investors should consult their own tax advisors concerning the application of these rules to their investment in the common shares or ADSs, including the application of the rules to their particular circumstances.

U.S. Information Reporting and Backup Withholding Rules

Payments of dividends and sales proceeds that are made within the United States or through certain U.S.-related financial intermediaries are subject to information reporting and may be subject to backup withholding unless the holder (i) is a corporation or other exempt recipient and demonstrates this when required or (ii) provides a taxpayer identification number and certifies that no loss of exemption from backup withholding has occurred. Holders that are not U.S. persons generally are not subject to information reporting or backup withholding. However, such a holder may be required to provide a certification of its non-U.S. status in connection with payments received within the United States or through a U.S.-related financial intermediary.

Korean Taxation

The following summary of Korean tax considerations applies to you so long as you are not:

• a resident of Korea;

• a corporation with its head office, principal place of business or place of effective management in Korea; or

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• engaged in a trade or business in Korea through a permanent establishment or a fixed base to which the relevant income is attributable or with which the relevant income is effectively connected.

Please consult your own tax advisers as to the Korean, state, local and other tax consequences of the purchase, ownership and disposition of common shares.

Taxation of Dividends on Common Shares or ADSs

We will deduct Korean withholding tax from dividends paid to you (whether payable in cash or in shares) at a rate of 22.0% (inclusive of local income surtax). If you are a qualified resident and a beneficial owner of the dividends in a country that has entered into a tax treaty with Korea, you may qualify for a reduced rate of Korean withholding tax. See “—Tax Treaties” below for a discussion on treaty benefits. If we distribute to you free shares representing a transfer of earning surplus or certain capital reserves into paid-in capital, that distribution may be subject to Korean withholding tax.

Taxation of Capital Gains from Transfer of Common Shares or ADSs

As a general rule, capital gains earned by non-residents upon transfer of our common shares or ADSs are subject to Korean withholding tax at the lower of (1) 11.0% (inclusive of local income surtax) of the gross proceeds realized or (2) subject to the production of satisfactory evidence of acquisition costs and certain direct transaction costs of the common shares or ADSs, 22.0% (inclusive of local income surtax) of the net realized gain, unless exempt from Korean income taxation under the applicable Korean tax treaty with the non-resident’s country of tax residence. See “—Tax Treaties” below for a discussion on treaty benefits. Even if you do not qualify for an exemption under a tax treaty, you will not be subject to the foregoing withholding tax on capital gains if you qualify under the relevant Korean domestic tax law exemptions discussed in the following paragraphs.

In regard to the transfer of our common shares through the Korea Exchange, you will not be subject to the withholding tax on capital gains (as described in the preceding paragraph) if you (1) have no permanent establishment in Korea and (2) did not own or have not owned (together with any shares owned by any person with which you have a certain special relationship) 25% or more of the total issued and outstanding shares, which may include the common shares represented by the ADSs, at any time during the calendar year in which the sale occurs and during the five consecutive calendar years prior to the calendar year in which the sale occurs.

Under Korean tax law, ADSs are viewed as shares of common stock for capital gains tax purposes. Accordingly, capital gains from the sale or disposition of ADSs are taxed (if such sale or disposition constitutes a taxable event) as if such gains are from the sale or disposition of the underlying common shares. Capital gains that you earn (regardless of whether you have a permanent establishment in Korea) from a transfer of ADSs outside of Korea will generally be exempt from Korean income taxation by virtue of the Special Tax Treatment Control Law of Korea, or the STTCL, provided that the issuance of the ADSs is deemed to be an overseas issuance under the STTCL. However, if you transfer ADSs after having converted the underlying common shares, such exemption under the STTCL will not apply and you will be required to file a corporate income tax return and pay tax in Korea with respect to any capital gains derived from such transfer unless the purchaser or a financial investment company with a brokerage license, as applicable, withholds and pays such tax.

If you are subject to tax on capital gains with respect to the sale of ADSs, or of our common shares you acquired as a result of a withdrawal, the purchaser or, in the case of the sale of the common shares on the Korea Exchange or through a financial investment company with a brokerage license in Korea, such financial investment company, is required to withhold Korean tax on capital gain from the sales price in an amount equal to the lower of (1) 11.0% (inclusive of local income surtax) of the gross realization proceeds or (2) subject to the production of satisfactory evidence of acquisition costs and certain direct transaction costs of the common shares or ADSs, 22.0% (inclusive of local income surtax) of the net realized gain, and to make payment of these amounts to the Korean tax authority, unless you establish your entitlement to an exemption under an applicable tax treaty or domestic tax law. See “—Tax Treaties” below for a discussion on claiming treaty benefits.

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Tax Treaties

Korea has entered into a number of income tax treaties with other countries (including the United States), which would reduce or exempt Korean withholding tax on dividends on, and capital gains on transfer of, the common shares or ADSs. For example, under the Korea-United States income tax treaty, reduced rates of Korean withholding tax of 16.5% or 11.0% (depending on your shareholding ratio and inclusive of local income surtax) on dividends and an exemption from Korean withholding tax on capital gains are available to residents of the United States that are beneficial owners of the relevant dividend income or capital gains, subject to certain exceptions. However, under Article 17 (Investment or Holding Companies) of the Korea-United States income tax treaty, such reduced rates and exemption do not apply if (i) you are a United States corporation, (ii) by reason of any special measures, the tax imposed on you by the United States with respect to such dividend income or capital gains is substantially less than the tax generally imposed by the United States on corporate profits and (iii) 25% or more of your capital is held of record or is otherwise determined, after consultation between competent authorities of the United States and Korea, to be owned directly or indirectly by one or more persons who are not individual residents of the United States. Also, under Article 16 (Capital Gains) of the Korea-United States income tax treaty, the exemption on capital gains does not apply if (a) you have a permanent establishment in Korea and any shares of common stock in which you hold an interest and which give rise to capital gains are effectively connected to such permanent establishment, (b) you are an individual and you maintain a fixed base in Korea for an aggregate of 183 days or more during a given taxable year and your ADSs or common shares giving rise to capital gains are effectively connected with such fixed base or (c) you are an individual and you are present in Korea for an aggregate of 183 days or more during a given taxable year.

You should inquire for yourself whether you are entitled to the benefit of a tax treaty between Korea and the country where you are a resident. It is the responsibility of the party claiming the benefits of an income tax treaty in respect of dividend payments or capital gains to submit to us, the purchaser or the financial investment company, as applicable, a certificate as to his tax residence. In the absence of sufficient proof, we, the purchaser or the financial investment company, as applicable, must withhold tax at the normal rates. Furthermore, in order for you to claim the benefit of a tax rate reduction or tax exemption on certain Korean source income (such as dividends or capital gains) under an applicable tax treaty, Korean tax law requires you (or your agent) to submit an application (for a reduced withholding tax rate, the “application for entitlement to a reduced tax rate,” and in the case of exemptions from withholding tax, the “application for tax exemption” along with a certificate of your tax residency issued by a competent authority of your country of tax residence, subject to certain exceptions) as the beneficial owner of such Korean source income, or a BO application. For example, a U.S. resident would be required to provide a Form 6166 as a certificate of tax residency together with the application for entitlement to reduced tax rate or the application for tax exemption. Such application should be submitted to the withholding agent prior to the payment date of the relevant income. Subject to certain exceptions, where the relevant income is paid to an overseas investment vehicle (which is not the beneficial owner of such income), or an OIV, a beneficial owner claiming the benefit of an applicable tax treaty with respect to such income must submit its BO application to such OIV, which must submit an OIV report and a schedule of beneficial owners to the withholding agent prior to the payment date of such income. In the case of a tax exemption application, the withholding agent is required to submit such application (together with the applicable OIV report in the case of income paid to an OIV) to the relevant district tax office by the ninth day of the month following the date of the payment of such income.

Inheritance Tax and Gift Tax

If you die while holding an ADS or donate an ADS, it is unclear whether, for Korean inheritance tax and gift tax purposes, you will be treated as the owner of the common shares underlying the ADSs. If the tax authority interprets depositary receipts as the underlying share certificates, you may be treated as the owner of the common shares and your heir or the donee (or in certain circumstances, you as the donor) will be subject to Korean inheritance tax or gift tax presently at the rate of 10% to 50%, provided that the value of the ADSs or common shares is greater than a specified amount.

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If you die while holding a common share or donate a common share, your heir or donee (or in certain circumstances, you as the donor) will be subject to Korean inheritance tax or gift tax at the same rate as indicated above.

At present, Korea has not entered into any tax treaty relating to inheritance or gift taxes.

Securities Transaction Tax

If you transfer our common shares on the Korea Exchange, you will be subject to securities transaction tax at the rate of 0.15% and an agriculture and fishery special surtax at the rate of 0.15% of the sale price of the common shares. If your transfer of the common shares is not made on the Korea Exchange, subject to certain exceptions, you will be subject to securities transaction tax at the rate of 0.5% and will not be subject to an agriculture and fishery special surtax.

Under the Securities Transaction Tax Law, depositary receipts (such as American depositary receipts) constitute share certificates subject to the securities transaction tax. However, the transfer of depositary receipts listed on the New York Stock Exchange, the Nasdaq Global Market, or other qualified foreign exchanges is exempt from the securities transaction tax.

In principle, the securities transaction tax, if applicable, must be paid by the transferor of the common shares or ADSs. When the transfer is effected through a securities settlement company, such settlement company is generally required to withhold and pay the tax to the tax authorities. When such transfer is made through a financial investment company only, such financial investment company is required to withhold and pay the tax. Where the transfer is effected by a non-resident without a permanent establishment in Korea, other than through a securities settlement company or a financial investment company, the transferee is required to withhold the securities transaction tax.

Non-reporting or under-reporting of securities transaction tax will generally result in penalties equal to 20% to 60% of the non-reported tax amount or 10% to 60% of under-reported tax amount. Also, a failure to timely pay securities transaction tax will result in a penalty equal to 10.95% per annum of the due but unpaid tax amount. The penalties are imposed on the party responsible for paying the securities transaction tax or, if such tax is required to be withheld, on the party that has the obligation to withhold.

Item 10.F. Dividends and Paying Agents

Not Applicable

Item 10.G. Statements by Experts

Not Applicable

Item 10.H. Documents on Display

We are subject to the information requirements of the Exchange Act, and, in accordance therewith, are required to file reports, including annual reports on Form 20-F, and other information with the U.S. Securities and Exchange Commission. These materials, including this annual report and the exhibits thereto, may be inspected and copied at the Commission’s public reference rooms in Washington, D.C., New York, New York and Chicago, Illinois. Please call the Commission at 1-800-SEC-0330 for further information on the public reference rooms. We are also required to make filings with the Commission by electronic means. Any filings we make electronically will be available to the public over the Internet at the Commission’s web site at http://www.sec.gov.

Item 10.I. Subsidiary Information

Not Applicable

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Item 11. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Overview

Our lending and trading businesses, our deposit taking activities and our operating environment expose us to various risks. Our risk management goal is to understand, measure and monitor these risks and to ensure that our employees strictly adhere to the policies and procedures that we establish. We seek to take a conservative approach to risk management in order to better insulate our operations from adverse events. Risks we face include:

• credit risk;

• market risk (primarily interest rate risk, equity risk, foreign exchange risk and commodity risk);

• liquidity risk; and

• operational and business risk (including legal risk).

We operate a standardized risk management system. This system enhances our risk management capabilities by enabling us to exchange information among our and our subsidiaries’ risk management operations. We have further strengthened our risk management systems by (i) using Tier I capital as “available capital” for purposes of our risk capital allocation to fulfill Basel III requirements, and (ii) including “stressed VaR” to our market risk capital calculations in accordance with the guidance of the Financial Supervisory Service. We use our risk management systems to manage our risks within acceptable limits and to otherwise ensure the soundness of our assets and the stability of our operations.

We allocate our total risk capital in accordance with the guidelines set by our Board Risk Management Committee. As described in more detail below, the committee allocates risk capital with respect to credit risk, market risk, interest rate risk and operational risk with respect to us as well as Woori Card, Woori Investment Bank, Woori Private Equity, Woori Bank China Limited, Woori America Bank and PT Bank Woori Saudara Indonesia 1906, Tbk.

Through our standardized risk management system we allocate our risk capital:

• with respect to credit risk on the basis of a standardized approach as well as other portfolio credit models developed by third party vendors;

• with respect to our market risk based on a market value at risk, or “VaR,” system and including “stressed VaR”; and

• with respect to our interest rate risk based on a historical simulation method, which simulates the current portfolio’s net present value at a 99.9% confidence level for a one-year holding period.

We allocate our risk capital with respect to operational risk through a standardized approach in accordance with Basel II.

Our risk capital allocation as a percentage of available capital, on a non-consolidated basis, with respect to 2018 is as follows:

	Available capital(1)		Risk capital		Risk appetite			Credit			Market			Operational			Interest rate			Correlation Effect			Buffer
	(in billions of Won, except percentages)
Woori Bank		18,916		13,220		69.9	%		60.2	%		5.4	%		4.6	%		4.5	%		(4.8	)%		30.1	%
Woori Card		1,551		853		55.0	%		47.2	%		0.0	%		5.7	%		7.0	%		(4.9	)%		45.0	%
Woori Investment Bank		279		233		83.5	%		73.5	%		8.2	%		2.9	%		2.5	%		(3.6	)%		16.5	%
Woori Private Equity		39		22		56.4	%		53.8	%		0.0	%		5.1	%		0.0	%		(2.6	)%		43.6	%
Woori America Bank		273		199		72.9	%		61.2	%		0.0	%		5.5	%		12.1	%		(5.9	)%		27.1	%
PT Bank Woori Saudara Indonesia 1906, Tbk		340		291		85.6	%		61.2	%		0.0	%		6.2	%		25.9	%		(7.6	)%		14.4	%
Woori Bank China Limited		494		438		88.7	%		67.0	%		11.9	%		3.8	%		11.9	%		(6.1	)%		11.3	%

⁽¹⁾ Estimates based on Tier I capital.

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Organization

We have a multi-tiered risk management governance structure. Our Board Risk Management Committee is ultimately responsible for our risk management. The Executive Risk Management Committee answers to the Board Risk Management Committee and coordinates the execution of its directives. Each Subsidiary Risk Management Committee, based on the Board Risk Management Committee’s directives, determines risk management strategies and implements risk management policies and guidelines for the relevant subsidiary, sets the subsidiary’s operational and business risk management policies and guidelines and directs the subsidiary’s risk management groups with support from the applicable Subsidiary Risk Management Council, but must keep within the risk guidelines of the Board Risk Management Committee. The Subsidiary Risk Management Committees generally receive input from their respective Subsidiary Risk Management Councils and subsidiary risk management groups.

The following chart sets out our risk management governance structure as of the date of this annual report:

We operate a “double report” system with respect to our risk management procedures. Each of our subsidiary risk management groups is required to submit risk management reports directly to the Risk Management Department. Through this internal reporting system, we are able to better ascertain and strengthen the monitoring of our subsidiaries’ risk management and are able to quickly address any deviation from our risk policies. We have further supplemented our double report system by strengthening the role and independence of chief risk officers in our subsidiaries (including the appointment of dedicated chief risk officers in all of our subsidiaries) and expanding the role of subsidiary risk management groups. Each subsidiary risk management group is required to report directly to such subsidiary’s chief risk officer on all material risk management issues as well as following the procedures under the double report system.

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The Board Risk Management Committee, the Executive Risk Management Committee, the Subsidiary Risk Management Committees and the Subsidiary Risk Management Councils are responsible for managing risks relating to credit, markets, asset and liability management, liquidity and operations and business.

Board Risk Management Committee

The Board Risk Management Committee is our highest decision-making body with respect to our risk management operations. It oversees and makes determinations on all significant issues relating to our risk management system. It implements policies regarding, monitors and has ultimate responsibility for managing credit, market and liquidity risk and for asset and liability management. The committee’s major activities include:

• determining and amending risk management policies, guidelines and limits in conformity with the strategy established by the board of directors;

• determining the appropriate level of risks that we should be willing to undertake, including in connection with key business activities such as acquisitions, investments or entering into new business areas, prior to a decision by the board of directors on such matters;

• allocating risk capital and approving our business groups’ risk limit requests;

• reviewing our risk profile, including the level of risks we are exposed to and the status of our risk management operations; and

• monitoring our compliance with our risk policies.

The Board Risk Management Committee is comprised of one non-standing director and three outside directors. It operates independently from all business groups and individual board members, and reports directly to our board of directors. We require the chairperson of the Board Risk Management Committee to be chosen from among the outside directors in order to enhance the independence and experience level of such chairperson. Our Board Risk Management Committee convenes at least quarterly, and makes decisions by a majority vote of the attending members. At least a majority of the committee members must attend to constitute a quorum.

Executive Risk Management Committee

Our Executive Risk Management Committee seeks to maintain our asset quality and stabilize or improve our profitability through the execution of its risk management duties as delegated by the Board Risk Management Committee. The Executive Risk Management Committee’s major activities include:

• analyzing our risk status using information provided by our Risk Management Department;

• reviewing agenda items of the Board Risk Management Committee meetings;

• reviewing the risks of annual business plans and allocating risk capital accordingly;

• establishing policies to comply with applicable capital adequacy requirements;

• determining standards and methods to measure risk and setting total exposure limits and contingency plans, by risk type;

• reviewing, adjusting and monitoring funding strategies and plans as well as related decision-making authority;

• monitoring interest rates relating to lending and deposit-taking; and

• reviewing risks relating to the introduction of new products.

The Executive Risk Management Committee consists of seven members, including the head of our business support group, who acts as chairman, the head of our risk management group, the head of our credit support group and the head of our finance and management planning division. It operates independently from all business groups, and reports directly to the Board Risk Management Committee. The Executive Risk Management Committee convenes on a monthly basis.

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Our Risk Management Department provides a variety of information to the Executive Risk Management Committee, including:

• reports regarding the status of overall risk management, the status of limit compliance, and analysis and results of stress testing and back testing; and

• reports regarding asset and liability management matters, including changes in risk-weighted assets and the status of our credit portfolio on a periodic basis.

Subsidiary Risk Management Committees

Each of our subsidiaries has delegated risk management authority to its Subsidiary Risk Management Committee. Each Subsidiary Risk Management Committee measures and monitors the various risks faced by the relevant subsidiary and reports to that subsidiary’s board of directors regarding decisions that it makes on risk management issues. It also makes strategic decisions regarding the operations of the relevant subsidiary, such as allocating credit risk limits, setting total exposure limits and market risk-related limits and determining which market risk derivatives instruments the subsidiary can trade. The major activities of each Subsidiary Risk Management Committee include:

• determining and monitoring risk policies, guidelines, limits and tolerance levels and the level of subsidiary risk in accordance with group policy, with the support of the relevant Subsidiary Risk Management Council;

• reviewing and analyzing the subsidiary’s risk profile;

• setting limits for and adjusting the risk-adjusted capital allocation plan and risk levels for each business group within the subsidiary; and

• monitoring compliance with our risk management policies and practices at the business group and subsidiary level.

Each Subsidiary Risk Management Committee generally includes two or more outside directors of the subsidiary.

Credit Risk Management

Our credit risk management policy objectives are to improve our asset quality, reduce our non-performing loans and minimize our concentration risk through a diversified, balanced and risk-weighted loan portfolio. We manage credit risk and continually monitor and improve our credit risk-related policies and guidelines to reflect changing risks in our business and the industries and sectors in which our customers operate.

We believe that an essential part of achieving our credit risk management objectives is utilizing a standardized risk management system so that we can identify and manage the risks generated by our businesses using a consistent approach. We are currently using a centralized credit risk management system called the CREPIA system. CREPIA is a credit risk management system which combines credit risk management and the credit approval process on a transactional level with respect to individual borrowers and approval with respect to each individual loan or credit. The system quantifies credit risk with respect to corporate borrowers using a “mark-to-market” methodology, which reflects both the likelihood of a default by a borrower as well as the likelihood of a change in such borrower’s credit rating, and quantifies credit risk with respect to retail borrowers using a “default mode” methodology, which reflects the likelihood of a default by a borrower. We believe that CREPIA is a systematic and efficient credit evaluation system and that we have expedited our loan review process and improved our ability to monitor and evaluate our overall risk profile by using this system. The main characteristics of CREPIA are as follows:

• automation of credit risk management system, which allows us to centralize and automate many tasks relating to our credit risk management system;

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• automatic recognition and processing of different forms of credit, which allows us to process and approve different types of credit, such as new applicants, renewing applicants and changes in the condition of the loan or credit approved;

• incorporation of credit risk management prior to approval of credit, which allows us to consider individualized characteristics of a borrower and enables us to calculate a more accurate price with respect to the loan or credit approved;

• automatic credit risk monitoring after approval of credit, which allows us to evaluate and re-rate the loan or credit on a real-time basis as a result of any change in the characteristics of the borrower (including the condition of the underlying collateral, change in borrowing limit and early warning characteristics); and

• automatic verification of internal procedures and regulations with respect to approval of credit, which reduces our operational risk and ensures that there are no material deviations from our loan and credit policies.

We also impose a credit risk limit with respect to “large exposures.” We aim to avoid concentrations of exposure with respect to any single corporate borrower or affiliated group of corporate borrowers. Accordingly, we have established aggregate exposure limits based on our capital adequacy levels and, with respect to individual corporate borrowers, established limits by dividing the “expected loss” with respect to companies affiliated with such corporate borrower with the “unexpected loss” (a measurement of credit risk) of such borrower and converting that into an exposure amount. We use this as the basis for our “large exposure” limits with respect to such corporate borrower.

We also impose a “principal investment” limit for investment activities that we and our subsidiaries undertake as a principal (as opposed to as an agent). The principal investment limit for each entity is set as a certain percentage of the capitalization of such entity.

We use our credit risk management systems to measure and control credit risk, to evaluate and approve new credit and to review and monitor outstanding credit. We conduct various quantitative and qualitative analyses to establish acceptable risk levels that provide what we believe are appropriate levels of return on investments. The credit risk management systems that we use to do this integrate various data, including customers’ financial and economic condition, limits on loans and guarantee amounts, cash flow evaluations, collateral levels, our desired profit margin and the likelihood of unexpected loan losses.

Each subsidiary monitors its level of risk, determines how that level compares to our target optimized level of risk on a monthly basis and produces risk analysis reports and optimization reports on a monthly basis and stress test reports on an ad hoc basis. These reports are sent to the respective Subsidiary Risk Management Committees and to the Board Risk Management Committee and provide a basis to set risk limits for, and allocate capital to, a subsidiary’s business groups.

Credit Evaluation and Approval

We and our subsidiaries evaluate the credit of every loan applicant and guarantor before approving any loans, except for:

• loans guaranteed by letters of guarantee issued by the Korea Credit Guarantee Fund, the Korea Technology Credit Guarantee Fund or certain other specified Korean government-controlled funds;

• loans guaranteed by highly rated banks;

• loans fully secured by deposits with us; and

• loans against commercial promissory notes issued by creditworthy companies at a discount to the face value of the note determined by the issuer’s creditworthiness.

The evaluation and approval process differs depending on whether the loan is a corporate loan, a general household consumer loan, or a mortgage or home equity loan, and there is a separate process for credit card

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applications. We have in recent years implemented a standardized “expected loss” and “unexpected loss” credit risk system which we believe enables us to better allocate risk capital by evaluating “unexpected loss” (a measurement of credit risk), “VaR” (a measurement of market risk) and “earnings at risk” (a measurement of whether our assets and liabilities are mismatched).

We have undertaken a number of initiatives to develop credit evaluation and loan approval procedures that are more systematic and efficient. We prefer to use credit rating systems in our credit evaluation and loan approval process because they:

• yield a uniform result regardless of the user;

• can be used effectively by employees who do not have extensive experience in credit evaluation;

• can be easily updated to reflect changing market conditions by changing how factors are weighted;

• significantly limit the scope of employee discretion in the loan assessment and approval process; and

• improve loan processing times while generally resulting in declines in delinquencies among new borrowers.

We operate a CREPIA credit evaluation system for corporate loans (including small- and medium-sized enterprise loans) and a consumer credit evaluation system for consumer loans.

Customers apply for loans by submitting a loan application through one of our branches. These applications are initially reviewed using the appropriate credit evaluation system and, in the case of applications for a small amount or involving applicants with little or no credit risk, are approved by the branch manager or a relationship manager acting in concert with a credit officer based on the credit risk rating they receive under that system. Applications for larger loans and loans which are determined to involve greater credit risk are approved by bodies with greater authority, depending on where those loans fall in a matrix of size, collateral and credit risk. These loan applications will be referred to a credit officer committee at an office located near the customer, which may or may not be at our headquarters. Every credit officer committee is made up of credit officers from headquarters and has the same level of authority. Applications that cannot be approved by a credit officer committee are referred to a senior credit officer committee or our Loan Committee, depending on loan size, collateral and credit risk. The following table sets forth as an example our various committees and personnel involved in our credit evaluation and loan approval process:

Committee	Members	Approval Process
Headquarters Approval
Loan Committee	Head of the credit support group, head of the risk management group, head of the investment banking group, head of the capital market group, head of the large corporate audit department, and head of medium-size enterprise audit department (no more than seven persons)	2/3 required for approval; 2/3 required to participate
Headquarters/Regional Approval
Senior Credit Officer Committee	One head senior credit officer and four to six other senior credit officers (five to seven persons)	2/3 required for approval; 2/3 required to participate
Credit Officer Committee	At least one senior credit officer and two other credit officers (at least three persons)	2/3 required for approval; 2/3 required to participate

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Committee	Members	Approval Process
Individual Approval
Senior Relationship Manager	Individual	Approval of the individual
Relationship Manager	Individual	Approval of the individual
Branch Manager	Individual	Approval of the individual

Different individuals or committees review and approve loan applications depending on various factors, including:

• the size and type of the loan;

• the level of credit risk established by the credit rating system;

• whether the loan is secured by collateral; and

• if the loan is secured, an assessment of the collateral.

Loan applications are generally reviewed only by the highest-level committee required to approve the loan, although multiple reviews, including separate reviews at the branch, regional and headquarters level, may occur depending on the size and terms of any particular loan or a borrower’s credit risk.

Corporate Loan Approval Process

Our branches review corporate loan applications using a credit evaluation system for corporate borrowers. Each corporate credit evaluation system measures various quantitative and qualitative factors. The model used by the credit evaluation system to review an application depends, however, on certain characteristics of the potential borrower. Our credit risk management department, together with our large corporate loan department and small- and medium-sized enterprise loan department, has developed separate credit evaluation models for large corporate borrowers that are subject to external audit under the Act on External Audits of Stock Companies, large corporate borrowers that are not subject to external audit, medium-sized enterprises and SOHO borrowers that either have outstanding loans, or are applying for a loan, in excess of ￦1 billion. In general, each model uses scores from both a computerized evaluation of quantitative financial factors, such as cash flow and income, and more qualitative factors which are scored using judgments by the credit officer or officers reviewing the application to produce an overall credit risk rating. These credit evaluation systems provide us with tools to make consistent credit decisions and assist us in making risk-based pricing decisions. Our CREPIA system, depending on whether the borrower is audited by independent auditors and its size, produces two separate scores based on one of 14 rating models: one for quantitative current financial factors, which is weighted 60% in determining the CREPIA credit risk rating, and another for the more qualitative factors that the judgment of our credit officers plays a more significant part in determining, which is weighted 40%. The CREPIA credit risk rating estimates the probability that we will recover extended credits and the likelihood that borrowers will default. Qualitative factors included in CREPIA include:

• a customer’s future financial condition;

• its competitive position in the industry;

• its industry situation;

• the quality of its management;

• its technological merits;

• its operations;

• the nature and the location of any collateral; and

• our level of priority in that collateral to estimate non-recovery risks.

These qualitative factors are input into the CREPIA system by the credit officer, and are scored based on his or her historical experience and that of the bank.

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The CREPIA system produces separate credit risk ratings for each borrower and for each loan requested by that borrower. Our credit analysis and approval center evaluates and approves corporate loan applications based on these credit risk ratings. The CREPIA system assigns each borrower and facility one of the following fourteen credit risk rating grades from AAA to D, which are classified as follows: AAA (extremely strong), AA (very strong), A+ (strong), A– (good), BBB+ (more adequate), BBB (adequate), BBB– (less adequate), BB+ (less susceptible), BB (susceptible), BB– (more susceptible), B+ (slightly weak), B– (weak), C (very weak) and D (default). Certain loans are subject to review by the Loan Committee depending on the size of the loan and the determined credit risk rating. Examples of this include loan applications for secured loans in excess of ￦80 billion for a borrower or facility with a credit risk rating of A- and above, and, at the other extreme for unsecured loans, loan applications in excess of ￦4 billion for a borrower or facility with a credit risk rating of BB– to C. Applications from borrowers with loans on a watch list (see “—Credit Review and Monitoring” below) are also automatically reviewed by the Loan Committee.

We use the same systems to evaluate and approve applications from small- and medium-sized enterprises that it uses to evaluate other corporate borrowers, but uses different credit evaluation models. Our credit evaluation models for small- and medium-sized enterprise customers, which are incorporated into the CREPIA system, use the same quantitative and qualitative factors that we use to evaluate other corporate customers. However, the small- and medium-sized enterprise models apply a 50% weighting to the score derived from quantitative factors and a 50% weighting to the score derived from the more flexible qualitative factors in determining the credit risk rating. We also use a separate credit evaluation model to evaluate newly opening small- and medium-sized enterprises that relies solely on qualitative factors. In addition, we have adopted a separate credit evaluation system for SOHOs (such as pharmacies, clinics and restaurants) which either have outstanding loans, or are applying for a loan, of ￦1 billion or less that uses simpler credit evaluation models and resembles our application scoring system for new retail customers.

With respect to the evaluation of any collateral to which a commercial loan application relates (which principally consists of land, buildings and equipment), the fair value of such underlying collateral for commercial loans is appraised by external valuation experts and such appraisals are collated in our CREPIA system. We use our CREPIA system to manage our lending activities, and input data gathered from loan application forms, credit scores of borrowers and the appraisal value of collateral provided by external valuation experts into the CREPIA system and update such information periodically to reflect changes in such information (such as any changes in credit scores of borrowers or the appraisal value of collateral). In addition, to validate the appropriateness of the appraisal values provided by such external valuation experts, we review the qualification of the external valuation experts (including a review of whether such experts are legitimately registered with the Korea Association of Property Appraisers) and evaluate the assumptions and valuation model used by such experts as well as the appropriateness of variables by reference to market data and comparisons to actual transaction prices in similar regions.

We have set credit limits for our corporate customers. Some of these limits, particularly those imposed by Korean banking regulations, are aimed at preventing loan concentrations relating to any single customer. See “Item 4.B. Business Overview—Supervision and Regulation—Principal Regulations Applicable to Banks—Financial Exposure to Any Individual Customer or Major Shareholder.” In certain cases, we have introduced and implemented internally developed large exposure limits that are stricter than the applicable Financial Services Commission requirements.

In evaluating applications, credit officers or the Loan Committee will often, in addition to reviewing ratings from these credit evaluation models, also refer to corporate information gathered or ratings assigned by external credit rating agencies, such as the Korea Federation of Banks, Korea Information Service, Korean government-released information on bankruptcy rates, National Information & Credit Evaluation Inc. and Korea Management Consulting & Credit Rating Corporation. They review the information we obtain from these sources and compare it to the information we have developed internally with respect to our customers to improve the accuracy of our internal credit ratings.

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Consumer Loan Approval Process

Our consumer loan department evaluates and approves consumer loan applications using a dedicated consumer credit evaluation system. Our consumer credit evaluation system assigns a credit score to each application based on its evaluation of various factors. These factors include any loan and guarantee limits we have set for particular borrowers or groups of borrowers and our evaluation of their cash flows and credit profiles. The system gives each customer’s loan application a score from one to ten. We also use another scoring system based on the external ratings provided by the Korea Credit Bureau. Applications are classified as “automatically approved,” “automatically rejected” and “subject to further evaluation” based on a combination of the scores of these two systems. We use these systems to evaluate all new consumer loan applications, except for loans fully secured by deposits with us.

We augment our consumer credit evaluation system with a behavioral scoring system. The behavioral scoring system enhances the consumer credit evaluation system by enabling the consideration of factors not previously evaluated, including the customer’s spending history and credit behavior. By the nature of the information it analyzes, however, the behavioral scoring system can only be used for applications of persons who are existing borrowers, generally consisting of roll-overs of outstanding amounts or increases to existing credit limits.

We also evaluate any collateral to which a consumer loan application relates (which principally consists of residential properties) using the fair value of the underlying collateral appraised by Korea Investors Service as part of our loan approval process. Such appraisals are collated in our CREPIA system, and such information is updated periodically to reflect changes (such as any changes in credit scores of borrowers or the appraisal value of collateral). For example, we automatically obtain re-evaluations for the underlying collateral for secured consumer loans and mortgages every month with respect to apartments. If the value of the collateral declines, we may have the ability to require that the borrower provide more collateral or to change the payment terms of the relevant loan.

Credit Card Approval Process

We have worked to ensure that our risk management and credit extension policies are consistently reflected with respect to our credit card operations.

Woori Card reviews each new card application for completeness, accuracy and creditworthiness. It bases this review on various factors that assess the applicant’s ability to repay borrowed amounts. The review process involves three stages:

• Initial Application Process.  Woori Card verifies basic information by requesting certain documents from the applicant, generally contacts the applicant directly (usually by telephone, although there are personal visits to some applicants) and statistically analyzes the applicant’s personal credit history together with financial and default information gathered from third-party sources and its internal database. The analysis considers various factors including employment, default status and historical relationships with us and any delinquency history with other credit card companies. Woori Card also reviews information about an applicant obtained from external databases maintained by the Korea Federation of Banks and Nice Information Service Inc.

• Application Scoring System Process.  The application scoring system at Woori Card is a standardized evaluation tool used to determine the probability of a credit card applicant defaulting during the one-year period following issuance. The application scoring system, using a statistical model, assigns risks to factors that indicate a probability of non-payment. The model analyzes credit history, occupation and income data to develop a combined risk score. The applicant’s eligibility to receive a credit card and credit limit is determined by its anticipated delinquency ratio over 90 days within one year.

• Credit Assessment.  If the application is approved, then the application scoring system assessment is used to determine the applicant’s credit limit. The aggregate credit limit for a new applicant who is an individual rarely exceeds ￦20 million. There is a separate but similar system for determining the credit

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limit available to corporate card applicants, which will generally be higher than limits available to individual applicants but will not provide for the ability to obtain cash advances.

The entire approval process generally takes two to three days and the applicant receives the new card within one week after making an application. Woori Card evaluates and updates the application scoring system on a monthly basis (or more frequently as required) to incorporate new data or adjust the importance placed on existing data or market conditions.

Credit Review and Monitoring

Our credit review and monitoring procedures are designed to reduce the risks of deterioration in our asset quality and to maintain acceptable levels of portfolio risk. These procedures include:

• confirming a borrower’s credit rating or score;

• ensuring the accuracy of the credit analysis done by our credit officers; and

• ensuring compliance with internal policies relating to loan approval.

We believe that these procedures enable us to identify potential non-performing loans as soon as possible and minimize the possibility of approving in advance loans that will become non-performing. These procedures also enable us to manage credit risk more effectively and set interest rates to more accurately reach our targeted level of return.

Loan Review and Monitoring

We monitor credit risk with respect to our borrowers using our loan review system. We have a loan review department that oversees our review and monitoring efforts. After a loan has been approved, the relevant materials or the results generated by our credit evaluation system, together with any supporting data, are reviewed by an officer in that department. There are three types of reviews that our loan review department undertakes:

• Desk review.  Desk reviews are the most common and are generally done within five days after a loan has been approved. Although the process is similar, different loans are automatically reviewed based on the size of the loan. The loan review department will initiate a desk review of loans approved by a credit officer committee or the Loan Committee, for any corporate loan over ￦5 billion, any consumer loan over ￦1 billion, any loan to a housing applicant group over ￦5 billion or any loan where the loan terms were adjusted. For loans originating from a branch, the loan review department will randomly initiate a desk review for new domestic loans. For overseas loans, desk reviews are conducted for new loans (including credit limit increases) over US$300,000. Ex post desk reviews are also conducted on consumer and corporate loans approved by a domestic branch manager for borrowers with aggregate unsecured loans over ￦50 million or aggregate secured loans over ￦300 million, and new consumer and corporate loans (including credit limit increases) over US$30,000 approved by overseas branch managers.

• Periodic review.  Periodic reviews are done on a quarterly, semi-annual or annual basis with respect to loans that are current and over ￦10 billion or with respect to borrowers who are on a “watch list” with respect to possible insolvency. Quarterly periodic reviews are done for certain corporate borrowers, depending on their size and the borrower’s industry.

• Ad hoc review.  Ad hoc reviews can be done at any time. The head of our Risk Management Department or our chief executive officer or chief financial officer can initiate ad hoc reviews. Loan review officers who are responsible for desk and periodic reviews also conduct ad hoc reviews.

Following a review, our sales office may hold additional meetings with the borrower and adjust the loan amount or the borrower’s credit rating. The loan review department may also direct sales office personnel to institute early collections or to adjust a borrower’s credit rating, total exposure and asset portfolio without

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consulting the borrower. The loan review officer may request that the credit officer adjust a borrower’s credit ratings based on various factors, including asset quality, credit limits, applied interest rates and our credit policies. We also continually review other factors, such as industries in which borrowers operate and their domestic and overseas assets and operations, to ensure that our ratings are appropriate.

We monitor and manage our exposures to and credit limits for corporations and chaebols on a daily basis. We use our Total Exposure Management System to make real-time inquiries regarding our exposures, either by company or by chaebol, and to manage the credit limits for all kinds of business transactions. We monitor and analyze these exposures on a monthly basis. Corporate borrowers on our “watch list” are monitored more closely and with respect to additional aspects of their relationships with us. We places borrowers on our watch list when we believe that any impediment on a borrower’s ability to meet its financial obligations exists or is pending. We may also monitor newly extended credits or any additional credits extended to a previous borrower more frequently if we believe additional monitoring is necessary after reviewing the loan approval process. Credits outstanding to a particular industry or region that we believe are higher risk are monitored even more frequently. Based on the results of such monitoring, our loan review department provides monthly reports to our chief executive officer and our Board Risk Management Committee.

We have the ability to conduct daily surveillance on the status of our retail borrowers through an on-line system established by the Korea Federation of Banks. This system, which tracks consumer loans at all major Korean banks and non-banking institutions, permits us to track all loan defaults by any borrower. We evaluate the need to monitor consumer loans by using our consumer credit evaluation system, including its behavioral scoring system, and make adjustments to the credit scoring formula based on the results of that process.

Our loan review department in our risk management group is required to submit monthly loan review reports and quarterly deficiency reports to the chief executive officer and the head of the risk management group. The chief executive officer then provides feedback to the relevant sales offices of our branches through our auditing team or relevant business group. Based on these reports, we may, for example, stop lending to particular borrowers, change credit limits or modify our loan approval procedures. We do not monitor loans to certain borrowers, such as loans to government entities.

Credit Card Review and Monitoring

Woori Card monitors its risk exposure to individual accounts on a regular basis. It monitors each customer’s card usage trends and negative credit data such as delinquency information through both its own credit risk management system (which was developed with the assistance of an outside consultant) and BC Card’s similar system (which BC Card maintains for its member institutions). These systems monitor the behavior of users of Woori Card’s credit cards, using both internally generated information and information from external sources. Woori Card statistically analyzes this information to estimate each customer’s creditworthiness on a monthly basis. The credit risk management system is an integral part of the credit practices at Woori Card and is used to determine increases or decreases in credit limits, reset interest rates, set fee levels, authorize special transactions and approve card loans using criteria such as:

• how much credit each customer has incurred in the past (i.e., frequency and amount of payments);

• whether a customer uses his card to make credit card purchases or to get cash advances;

• internal credit scores; and

• whether the customer has been delinquent in making payments.

After assigning appropriate weightings to each factor, the system computes a behavior score and uses that score to classify each cardholder. Each customer’s credit limit is subject to adjustment in accordance with the monthly updated score. Woori Card uses these results and the results of its application scoring system to evaluate its credit risk management system and make adjustments to its credit scoring formula based on the results of that process.

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Woori Card’s credit risk management system has also been able to run various simulations in connection with monitoring its operations, including:

• new product simulations, which predict a customer’s likely spending pattern when using a new credit card product and analyzes that pattern to predict the new product’s costs, delinquencies and profitability; and

• credit use limit simulations, which test whether a customer’s credit limit has been properly set by simulating an increase or decrease of that limit.

Woori Card’s credit administration team manages customer credit risk for users of its credit cards. It reviews and updates its underwriting, credit evaluation, collection, servicing and write-off procedures, and the terms and conditions of card agreements, from time to time in accordance with its business practices, applicable law and guidelines issued by regulatory authorities.

Early Warning Systems

We and Woori Card have developed separate early warning systems that monitor the status of both commercial and retail borrowers and evaluate all of a customer’s outstanding credits. These systems monitor various factors, including the financial status, financial transaction status, industry rating and management status of borrowers. They enable us to find defaults and signs of potential delinquency in advance, monitor these problematic credits properly before any default or delayed payment occurs and keep track of information on the credit status of borrowers. Updated information is input as it becomes available, either automatically from internal and external sources or manually. This information includes data relating to:

• credit evaluation and monitoring system results, which determine if a borrower should be put on a watch list;

• loan transactions, such as a borrower’s remaining line of credit and whether it has any dishonored notes, overdue loans or setoffs with respect to collateral deposits which have not matured;

• deposit transactions, such as any decrease in a borrower’s average deposit balance, requests for large volumes of promissory notes or checks, or the inability to pay immediately available funds owed when due;

• foreign exchange transactions, such as unpaid amounts of a borrower’s purchased export bills that have exceeded the maturity date; and

• other information, such as a borrower’s management and employees, business operations, production operations, financial affairs and accounting operations and bank transactions.

We also monitor borrowers’ credits through on-line credit reports that are provided by Korea Information Service and National Information & Credit Evaluation, Inc., which are Korean credit reporting agencies.

After gathering this information, our CREPIA system reviews such information to monitor any changes that could affect the credit rating of the borrower, approval conditions with respect to the loan or credit, underlying collateral or assigned credit limit of the borrower. Depending on the likelihood of the change, the system automatically sends a signal to the responsible credit officer. The officer then evaluates the information and formulates an action plan, which could result in an adjustment in the borrower’s credit rating or loan pricing, a re-evaluation of the loan or the taking of other preventative measures.

Credit Remediation

We believe that by centralizing the management of our non-performing credits, we can implement uniform policies for non-performing credit resolution, pool institutional knowledge and create a more specialized (and therefore more efficient) work force. Our Credit Management and Collection Department and our Corporate Restoration Department generally oversee the process for resolving non-performing loans transferred to them by our other business groups. When a loan becomes non-performing, the Credit Management and Collection

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Department and the Corporate Restoration Department will begin a due diligence review of the borrower’s assets, send a notice demanding payment or stating that the group will take legal action, and prepare for legal action. At the same time, we initiate our non-performing loan management process. Once we have confirmed the details of a non-performing loan, we make efforts to recover amounts owed to us. Methods for resolving non-performing loans include commencing collection proceedings or legal actions and writing off such loans, transferring them to subsidiaries in charge of collection and authorizing those subsidiaries to recover what they can. We have also disposed of a number of non-performing credits to UAMCO and various structured companies. See “Item 4.B. Business Overview—Assets and Liabilities—Asset Quality of Loans—Non-Performing Loan Strategy.”

Market Risk Management

The principal market risks to which we are exposed are interest rate risk, foreign exchange risk and, to a lesser extent, equity risk and commodity risk. We divide market risk into risks arising from trading activities and risks relating to management of our assets and liabilities. The financial instruments that expose us to market risks are primarily trading and available-for-sale securities and financial derivatives and, with respect to commodity risk, commodity derivatives.

Our Board Risk Management Committee establishes risk capital allocation and risk limits for our trading activities. The Board Risk Management Committee has delegated the responsibility for coordinating market risk management for trading activities to the Executive Risk Management Committee. The Risk Management Department reviews on a daily basis reports that include trading profits and losses, position reports, stress test results and “value at risk” results for our trading activities. Any violations of such risk limits are reported to the Executive Risk Management Committee and the Board Risk Management Committee.

Market Risk Management for Trading Activities

We measure market risk from trading activities to monitor and control the risk of our business groups and teams that perform those activities. Our trading activities consist of:

• trading activities for our own account to realize short-term trading profits in debt (primarily Won-denominated), equity and foreign exchange markets based on our forecasts of changes in market situation and customer demand; and

• trading activities involving derivatives transactions, including interest rate and foreign exchange swaps, forwards, futures and options and, to a lesser extent, commodity derivatives, primarily to sell derivatives products to our customers and to hedge our own market risk.

Market risk arising from our trading activities can be subdivided into interest rate risk, foreign exchange risk, equity risk and commodity risk:

• Interest rate risk is a significant risk to which our trading activities are exposed. This risk arises primarily from our debt securities. We set different risk limits for our interest rate risk for our trading and non-trading debt portfolios.

• Foreign exchange risk arises from foreign currency-denominated assets and liabilities in both our trading and non-trading accounts and financial derivatives involving foreign currencies, which are not controlled separately on a trading and asset/liability management basis.

• Equity risk arises from price and volatility fluctuations in equity securities and derivatives.

• Commodity risk arises from price and volatility fluctuations in commodity derivatives.

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The following table shows the volume and types of our trading positions (including trust accounts) subject to market risk as of December 31, 2015, 2016 and 2017:

	As of December 31,
	2015		2016		2017
	(in millions of Won)
Debt securities	￦	2,354,266	￦	2,644,916	￦	2,644,334
Equity securities		70,418		40,442		21,666
Spot exchanges(1)		386,350		1,029,928		1,049,388
Derivatives(2)		5,246,017		6,235,454		6,627,055
Total	￦	8,057,051	￦	9,950,740	￦	10,342,443

⁽¹⁾  Represents the overall net open currency position in each currency, which is the greater of (i) the sum of the absolute values of all short positions and (ii) the sum of the absolute values of all long positions.

⁽²⁾  For over-the-counter derivatives, represents the absolute value of over-the-counter derivatives measured at fair value at the end of the relevant year. For exchange-traded derivatives, includes the amount of deposits and the collateral posted for such derivatives.

The Board Risk Management Committee monitors our market risk. The Board Risk Management Committee has established a maximum “market risk appetite,” which is defined as risk capital divided by available capital. “Risk capital” is a benchmark figure that determines the VaR limits, accumulated loss limits (for trading portfolios) and present value of a basis point (or PVBP) limits (for non-trading available-for-sale assets). Available capital generally consists of shareholder’s equity. Using this benchmark, as of December 31, 2017, we have established market risk limits as shown in the following table:

Trading Portfolio			Non-Trading Portfolio
VaR Limit	Accumulated Loss Limit		PVBP Limit
	Quarter	Annual
(in billions of Won)
￦  14.4	￦  59	￦  118	￦  4.8

We generally manage our market risk at the portfolio level. To control our exposure, we take into consideration the VaR limits, accumulated loss limits and PVBP limits set by the Board Risk Management Committee in determining our internal allocation of risk among our various portfolios. We also set stop loss limits with respect to particular types of transactions. We use an integrated market risk management system to manage market risks for our debt and equity trading operations. This system enables us to generate consistent VaR numbers for all of our trading activities.

In addition, we have implemented internal processes which include a number of key controls designed to ensure that fair value is measured appropriately, particularly where a fair value model is internally developed and used to price a significant product. See “Item 5.A. Operating Results—Critical Accounting Policies—Valuation of Financial Assets and Liabilities” and Notes 2-(9)-5), 3-(3) and 11 of the notes to our consolidated financial statements. For example, our Risk Management Department reviews the existing pricing and valuation models on a regular basis, with a focus on their underlying modeling assumptions and restrictions, to assess the appropriateness of their continued use. In consultation with our Trading Department, the Risk Management Department recommends potential valuation models to our Fair Value Evaluation Committee. Upon approval by our Fair Value Evaluation Committee, the selected valuation models are reported to the Board Risk Management Committee.

Value at Risk analysis.  We use daily VaR to measure market risk. Our daily VaR is a statistically estimated maximum amount of loss that can occur for a day. We use a 99% confidence level to measure our daily VaR, which means the actual amount of loss may exceed the VaR, on average, once out of 100 business days. We use the “historical simulation method” which takes into account the diversification effects among different risk factors.

Although VaR is a commonly used market risk management technique, it has some inadequacies. Since it is a statistical approach, VaR estimates possible losses over a certain period at a particular confidence level using

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past market movement data. Past market movements, however, are not necessarily a good indicator of future events. Another problem with VaR is that the time periods used for the model, generally one or 10 days, are assumed to be a sufficient holding period before liquidating the relevant underlying positions. If these holding periods are not sufficient, or too long, VaR may understate or overstate the potential loss. VaR is most appropriate as a risk measure for trading positions in liquid financial markets and will understate the risk associated with severe events, such as a period of extreme liquidity.

The following table shows our daily VaR as of December 31, 2015, 2016 and 2017 at a 99% confidence level for a one-day holding period, for interest rate risk, equity risk, foreign exchange risk and commodity risk relating to our trading activities.

	Interest Rate Risk		Foreign Exchange Risk		Equity Risk		Commodity Risk		Less: Diversification		VaR for Overall Trading Activities
	(in millions of Won)
As of December 31, 2015	￦	2,907	￦	3,997	￦	3,186	￦	117	￦	5,017	￦	5,190
As of December 31, 2016		3,250		4,396		4,191		152		5,630		6,359
As of December 31, 2017		4,183		4,750		909		0		4,472		5,370

In 2015, 2016 and 2017, the average, high, low and ending amounts of daily VaR relating to our trading activities (at a 99% confidence level for a one-day holding period) were as follows:

	As of December 31, 2015			For the year ended December 31, 2015									As of December 31, 2016			For the year ended December 31, 2016									As of December 31, 2017			For the year ended December 31, 2017
				Average			Maximum			Minimum						Average			Maximum			Minimum						Average			Maximum			Minimum
Interest risk	￦	2,907		￦	2,742		￦	3,991		￦	1,211			￦3,250		￦	2,844		￦	6,430		￦	1,367			￦4,183		￦	3,799		￦	4,918		￦	2,467
Foreign exchange risk		3,997			3,415			4,847			2,329			4,396			4,914			7,686			3,967			4,750			5,051			6,636			4,061
Equity risk		3,186			2,411			4,377			531			4,191			3,456			5,063			2,304			909			2,863			4,419			909
Commodity risk		117			102			218			5			152			113			325			21			0			31			188			0
Diversification		(5,017	)		(3,858	)		(6,910	)		(411	)		(5,630	)		(5,355	)		(10,385	)		(4,034	)		(4,472	)		(4,621	)		(6,798	)		(2,067	)
Total risk	￦	5,190		￦	4,812		￦	6,523		￦	3,665		￦	6,359		￦	5,972		￦	9,119		￦	3,625		￦	5,370		￦	7,123		￦	9,363		￦	5,370

The graph of daily 99% VaR relating to our trading activities in 2017 is as follows:

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Standardized Method.  The standardized method is used to measure the market risk of the positions for which the Financial Supervisory Service has not approved the use of the VaR method. The following table shows the market risk capital charges measured using the standardized method as of December 31, 2015, 2016 and 2017:

	As of December 31,
	2015		2016		2017
	(in millions of Won)
Risk categories
Interest risk	￦	13,386	￦	11,775	￦	12,468
Equity risk		8,341		4,930		3,367
Foreign exchanges risk		2,991		18,265		19,658
Commodity risk		4,526		3,084		1,204
Total	￦	29,244	￦	38,054	￦	36,697

Back-testing.  We conduct back testing on a daily basis to validate the adequacy of our market risk management. In our back testing, we compare both the actual and hypothetical profit and loss with VaR calculations and analyze any results that fall outside our predetermined confidence interval of 99%. The number of times the actual changes in our profit and loss exceeded the VaR amounts in 2015, 2016 and 2017 was 0.

Stress test.  In addition to VaR, we perform stress testing to measure market risk. As VaR assumes normal market situations, we assess our market risk exposure to abnormal market fluctuations through stress testing. Stress testing is an important way of supporting VaR since VaR is a statistical expression of possible loss under a given confidence level and holding period. It does not cover potential loss if the market moves in a manner that is outside our normal expectations. Stress testing projects the anticipated change in value of holding positions under certain scenarios assuming that we take no action during a stress event to change the risk profile of a portfolio. The following table shows the loss that would have occurred in our trading portfolio as of December 31, 2017 for assumed short-term extreme changes of a +/-20% change in the equity market and a +/-60 basis point change from interest rates prevailing in the market on that date, under an abnormal stress environment.

	(in billions of Won, except percentages)
Equity Market Chart Market fluctuation amount		(20	)%		(10	)%		(5	)%		5	%		10	%		20	%
	￦	10.9		￦	(4.5	)	￦	(3.3	)	￦	2.4		￦	8.1		￦	37.6

(in billions of Won, except basis points)

Interest Rate Chart Basis point fluctuation amount

(60) basis points

(40) basis points

(20) basis points

20 basis points

40 basis points

60 basis points

￦

0.7

￦

0.4

￦

0.2

￦

(0.2

)

￦

(0.4

)

￦

(0.7

)

Stop loss limits.  The Board Risk Management Committee also approves total accumulated loss limits, and the heads of our relevant trading departments set their own stop loss limits with respect to particular types of transactions. We have stop loss limits for various trading activities, including:

• for trading equity securities in Won, within 25% of the purchase price of such securities;

• for trading fixed income securities in Won, within 5% of the purchase price of such securities;

• for available-for-sale equity securities in Won, within 30% of the purchase price of such securities;

• for available-for-sale fixed income securities in Won, within 10% of the purchase price of such securities;

• for trading equity or fixed income securities in foreign currencies, within 5% of the purchase price of such securities; and

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• for available-for-sale equity or fixed income securities in foreign currencies, within 15% of the purchase price of such securities.

Interest Rate Risk

Interest rate risk from trading activities arises mainly from our trading of Won-denominated debt securities. Our trading strategy is to benefit from short-term movements in the prices of debt securities arising from changes in interest rates. As our trading accounts are marked-to-market daily, we manage our interest rate risk related to our trading accounts using market value-based tools such as VaR. See “—Asset and Liability Management—Interest Rate Risk.”

Foreign Exchange Risk

Foreign exchange risk arises because we have assets, liabilities and off-balance sheet items such as foreign exchange forwards and currency swaps that are denominated in non-Won currencies. The difference between our foreign currency assets and liabilities is offset against forward foreign exchange positions to obtain our net foreign currency open position. We determine the maximum foreign exchange exposure for both trading and asset and liability management purposes by establishing a limit for this net foreign currency open position. Our Board Risk Management Committee also establishes VaR limits for our foreign exchange business.

Assets and liabilities denominated in U.S. dollars account for the majority of our foreign currency assets and liabilities. Those denominated in Japanese yen and the euro account for most of the remainder, the majority of which have been swapped into U.S. dollars.

We monitor changes in, and matches of, foreign-currency assets and liabilities in order to reduce exposure to currency fluctuations. We also manage risks relating to exchange rate fluctuations through foreign exchange dealing, including by our overseas branches. However, we conduct foreign exchange dealings primarily on behalf of our customers. Counterparties are restricted to domestic and foreign financial institutions and banks with respect to which we have established a foreign exchange dealing limit. We deal primarily in the Won/U.S. dollar market and such dealings are subject to what we believe are conservative daily maximum and closing limits and stop loss limits. The following table sets forth information concerning our limits on proprietary foreign exchange dealings as of December 31, 2017:

	Won/U.S. Dollar Dealing				Dealings in other currencies
	Headquarters				Headquarters				Overseas Branches
	Total		Individual		Total		Individual		Total		Individual
	(in millions of US$)
Open position
Daily maximum limit	US$	1,000	US$	200	US$	200	US$	50	US$	60	US$	15
Daily closing limit		200		50		100		20		30		6
Stop loss:
Daily		2		0.5		0.8		0.15		0.24		0.045
Monthly		3		0.8		2		0.5		0.6		0.15

The following table shows our non-consolidated net open positions at the end of 2015, 2016 and 2017. Positive amounts represent long exposures and negative amounts represent short exposures.

	As of December 31,
	2015			2016			2017
	(in millions of US$)
Currency
U.S. dollar	US$	(14.1	)	US$	(177.4	)		US$ (278.6)
Japanese yen		(72.2	)		(8.4	)		(22.6	)
Euro		(7.9	)		(76.9	)		(266.6	)
Others		(37.1	)		138.3			148.9
Total	US$	(131.3	)	US$	(124.4	)	US$	(418.9	)

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Equity Risk

Equity price risk and equity volatility risk result from our equity portfolio, which consists mainly of futures contracts and options and Won-denominated equity securities, as a result of the strict limits we have imposed with respect to VaR and accumulated loss limits, and stress test limits. Equity risk arises in the context of trading activities for our own accounts to realize short-term trading profits with respect to equity and trading activities involving certain derivatives transactions.

Commodity Risk

Commodity risk represents exposures to instruments traded in the metals, petroleum, natural gas and other commodities markets, and arises principally from our trading of U.S. dollar-denominated commodity derivatives. We manage our commodity risk using VaR, accumulated loss and stress test limits.

Derivatives-Related Market Risk

The Foreign Exchange Transaction Regulations of Korea provide that a foreign exchange bank (such as us) may generally enter into derivatives transactions without restriction so long as those transactions are not linked with credit risks of a party to the transaction or any third party. If they are, we must report the transaction to the Bank of Korea.

Most of the derivatives products that we trade are on behalf of our customers or to hedge our own positions. Our derivatives activities include interest rate and cross-currency swaps, foreign exchange forwards, stock index and interest rate futures, forward rate agreements and currency and over-the-counter equity options.

Asset and Liability Management

Our principal market risk with respect to managing our assets and liabilities is interest rate risk. Interest rate risk arises due to mismatches in the maturities or re-pricing periods of rate-sensitive assets and liabilities, such as loans and deposits. Any imbalance of the maturity of our interest rate-sensitive assets and liabilities and the gap resulting from that imbalance may cause net interest income to be affected by changes in the prevailing level of interest rates. Our principal asset and liability management objectives are to generate stable net interest revenues and protect our asset value against interest rate fluctuations.

We use a standardized asset and liability management system for our Won- and foreign currency-denominated assets and liabilities. In addition, our system also allows us to manage the assets and liabilities in our trust accounts. Our system uses the historical scenario method to determine interest rate VaR, supplemented by modules to calculate and monitor our liquidity coverage ratio and net stable funding ratio.

Interest Rate Risk

We manage interest rate risk based on rational interest rate forecasts, using gap analysis to measure the difference between interest-sensitive assets and interest-sensitive liabilities, and using simulations to calculate the effect of changing interest rates on income. We principally manage this risk by managing maturity and duration gaps between our interest-earning assets and interest-bearing liabilities.

We measure interest rate risk for Won and foreign currency assets and liabilities, including derivatives and principal guaranteed trust accounts. Most of our interest-earning assets and interest-bearing liabilities are denominated in Won and our foreign currency-denominated assets and liabilities are mostly denominated in U.S. dollars. We believe, however, that our interest rate sensitivity is limited with respect to our Won-denominated assets. Deposits in Won generally bear fixed rates of interest for fixed time periods (other than deposits payable on demand which constituted approximately 45.7% of our total deposits in Won as of December 31, 2017). We generally adjust the interest rates on these deposits when they are rolled over. In addition, as of December 31, 2017, 97.6% of those deposits had current maturities of one year or less. As of December 31, 2017, approximately 65.4% of our Won-denominated loans bore floating rates of interest, and 54.4% of those loans had current maturities of one year or less.

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Interest rate gap analysis measures expected changes in net interest revenues by calculating the difference in the amounts of interest-earning assets and interest-bearing liabilities at each maturity and interest resetting date. We perform interest rate gap analysis for Won and foreign currency-denominated assets on a monthly basis.

Interest Rate Gap Analysis.  For interest rate gap analysis we use or assume the following maturities for different assets and liabilities:

• With respect to maturities of assets, for prime rate-linked loans, we apply the actual maturities of each loan; furthermore, we assume the reserves with the Bank of Korea and loans and securities classified as substandard or below to have maximum remaining maturities.

• With respect to maturities of liabilities, for demand deposits with no fixed maturities, a portion of the demand deposits are recognized to have maturities of less than three months as calculated in accordance with Financial Services Commission guidelines.

Our Board Risk Management Committee’s interest rate risk limit generally requires that our earnings at risk for Won-denominated accounts be within 10% of our estimated net interest income for a one-year period. We calculate VaR through our standardized asset and liability management system, which uses the historical scenario method to simulate the current portfolio’s net asset value for a one-year holding period at a 99.9% confidence level.

The following tables show, on a non-consolidated basis pursuant to the guidelines of the Financial Supervisory Service, the interest rate gap for our Won-denominated accounts and foreign currency-denominated accounts as of December 31, 2017:

	As of December 31, 2017
	0-3 Months		3-6 Months		6-12 Months			1-3 Years		Over 3 Years			Total
	(in billions of Won, except percentages)
Won-denominated accounts:
Interest rate-sensitive assets
Free interest rate	￦	11,326	￦	7,793	￦	9,649		￦	20,927	￦	21,113		￦	70,808
Market interest rate		119,845		33,779		8,922			11,109		3,389			177,044
Interest rate pegged to customer deposit		56		47		68			10		1			182
Total	￦	131,227	￦	41,619	￦	18,639		￦	32,046	￦	24,503		￦	248,034
Interest rate-sensitive liabilities
Free interest rate	￦	23,918	￦	7,954	￦	8,664		￦	14,999	￦	13,737		￦	69,272
Market interest rate		59,259		22,552		34,306			350		41,375			157,842
Total	￦	83,177	￦	30,506	￦	42,970		￦	15,349	￦	55,112		￦	227,114
Sensitivity gap		48,050		11,113		(24,331	)		16,697		(30,609	)		20,920
Cumulative gap		48,050		59,163		34,832			51,529		20,920			20,920
% of total assets(1)		18.02		22.19		13.06			19.32		7.84			7.84
Total assets in Won													￦	266,680

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	As of December 31, 2017
	0-3 Months			3-6 Months			6-12 Months			1-3 Years			Over 3 Years			Total
	(in millions of US$, except percentages)
Foreign currency-denominated accounts:
Interest rate-sensitive assets
Free interest rate	US$	0		US$	0		US$	0		US$	0		US$	0		US$	0
Market interest rate		16,504			1,960			371			1,118			315			20,268
Interest rate pegged to customer deposit		0			0			0			0			0			0
Total	US$	16,504		US$	1,960		US$	371		US$	1,118		US$	315		US$	20,268
Interest rate-sensitive liabilities
Free interest rate	US$	0		US$	0		US$	0		US$	0		US$	0		US$	0
Market interest rate		9,855			825			940			980			3,104			15,704
Total	US$	9,855		US$	825		US$	940		US$	980		US$	3,104		US$	15,704
Sensitivity gap		6,649			1,135			(569	)		138			(2,789	)		4,564
Cumulative gap		6,649			7,784			7,215			7,353			4,564			4,564
% of total assets(1)		23.70	%		27.74	%		25.72	%		26.21	%		16.27	%		16.27	%
Total assets in US$																US$	28,054

⁽¹⁾  Represents the cumulative gap as a percentage of total assets.

Duration Gap Analysis.  We also perform a duration gap analysis to measure and manage our interest rate risk. Duration gap analysis is a more long-term risk indicator than interest rate gap analysis, as interest rate gap analysis focuses only on accounting income and not on the market value of the assets and liabilities. We emphasize duration gap analysis because, in the long run, our principal concern with respect to interest rate fluctuations is the net asset value rather than net interest revenue changes.

For duration gap analysis, we use or assume the same maturities for different assets and liabilities that we use or assume for our interest rate gap analysis.

The following table shows, with respect to our Won-denominated assets and liabilities, duration gaps and net asset value changes when the interest rate increases by one percentage point as of the specified dates:

Date	Interest-bearing asset duration		Interest-bearing liability duration		Total asset/liability duration gap		Net asset value change
	(in years)		(in years)		(in years)		(in billions of Won)
June 30, 2015		0.92		0.75		0.23		529
December 31, 2015		0.91		0.77		0.21		505
June 30, 2016		0.93		0.76		0.24		618
December 31, 2016		0.85		0.74		0.17		423
June 30, 2017		0.84		0.78		0.12		292
December 31, 2017		0.82		0.78		0.11		259

We set interest rate risk limits using the historical simulation method, which uses actual historical price, volatility and yield changes in comparison with the current position to generate hypothetical portfolios and calculate a distribution of position and portfolio market value changes. The following table shows our interest rate VaR with respect to our Won-denominated assets and liabilities for each of the quarters since the fourth quarter of 2016:

	Fourth Quarter 2016		First Quarter 2017		Second Quarter 2017		Third Quarter 2017		Fourth Quarter 2017
	(in billions of Won, except percentages)
Interest rate VaR	￦	237.6	￦	335.0	￦	354.6	￦	372.0	￦	394.5

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Gap analysis reports, duration gap analysis reports and interest rate limit compliance reports prepared by our risk management groups are reviewed by our Executive Risk Management Committee on a monthly basis and submitted to the Board Risk Management Committee on a quarterly basis.

Foreign Exchange Risk

We manage foreign exchange rate risk arising in connection with the management of our assets and liabilities together with such risks arising from our trading operations. See “—Market Risk Management for Trading Activities—Foreign Exchange Risk” above.

Liquidity Risk Management

Liquidity risk is the risk of insolvency or loss due to disparity between inflow and outflow of funds such as maturity mismatch, including having to obtain funds at a high price or to dispose of securities at an unfavorable price due to lack of available funds. We manage our liquidity in order to meet our financial liabilities from withdrawals of deposits, redemption of matured debentures and repayments at maturity of borrowed funds. We also require sufficient liquidity to fund loans and extend other forms of credits, as well as to make investments in securities. Our Board Risk Management Committee establishes liquidity policies and monitors liquidity on an on-going basis. We make constant adjustment to take into account variables affecting our liquidity levels. Our risk management groups review the uses and sources of funds on a daily basis, taking into consideration the various goals of our respective business groups. Our liquidity management goal is to be able, even under adverse conditions, to meet all our liability repayments on time and fund all investment opportunities.

We maintain diverse sources of liquidity to facilitate flexibility in meeting our funding requirements. We fund our operations principally by accepting deposits from retail and corporate depositors, accessing the call loan market (a short-term market for loans with maturities of less than one month), issuing debentures and borrowing from the Bank of Korea. We use the majority of funds raised by us to extend loans or purchase securities. Generally, deposits are of shorter average maturity than loans or investments.

In managing liquidity risk, we determine gap limits, implement those limits and monitor maturity gaps using our asset and liability management system. We also establish gap limits for liquidity management purposes. Our three-month accumulated gap limits for banking and trust accounts are between (10)% and 10%. In the foreign currency account, the limit for a one-week gap has been set as (3)% or higher and as (10)% or higher for a one-month gap.

Liquidity is maintained by holding sufficient quantities of assets that can be liquidated to meet actual or potential demands for funds from depositors and others. Liquidity is also managed by ensuring that the excess of maturing liabilities over maturing assets in any period is kept to manageable levels relative to the amount of funds we believe we can raise when required. We seek to minimize our liquidity costs by managing our liquidity position on a daily basis and by limiting the amount of cash at any time that is not invested in interest-earning assets or securities.

The Financial Services Commission uses the liquidity coverage ratio, defined as the ratio of highly liquid assets to total net cash outflows over a 30-day period, as the principal liquidity risk management measure and currently requires each Korean bank to:

• maintain a liquidity coverage ratio of not less than 95% from January 1, 2018 to December 31, 2018, subject to certain exceptions, with such minimum liquidity coverage ratio to increase to 100% in 2019;

• maintain a foreign currency liquidity coverage ratio of not less than 70% from January 1, 2018 until December 31, 2018, with such minimum foreign currency liquidity coverage ratio to increase to 80% in 2019; provided, however, that the foreign currency liquidity ratio (defined as the ratio of foreign currency assets due within three months to foreign currency liabilities due within three months) would apply if the amount of foreign currency assets and the ratio of foreign currency liabilities to total liabilities are less than the respective amount and ratio specified under the Bank Act and the regulations thereunder; and

• submit monthly reports with respect to the maintenance of these ratios.

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As of December 31, 2017, our 30-day liquidity coverage ratio was 100.87%, above the Financial Services Commission’s standard of 95%.

The following table shows the liquidity status, on a cumulative basis, and limits for our foreign currency accounts on a non-consolidated basis as of December 31, 2017 in accordance with the Financial Services Commission’s regulations:

	7 days or less			8 days –1 month			3 months or less
	(in millions of US$)
Foreign currency accounts:
Foreign currency assets	US$	14,366		US$	14,508		US$	44,022
Foreign currency liabilities		10,468			15,106			38,990
Maturity gap		3,898			-598			5,032
Cumulative gap (A)		3,898			3,300			5,032
Total assets (B)		97,532			97,532			97,532
Liquidity gap ratio (A/B)		4.00	%		3.38	%		112.91	%(1)
Limits		(3	)%		(10	)%		85	%

⁽¹⁾  Liquidity ratio, calculated as foreign currency assets as a percentage of foreign currency liabilities.

Our Executive Risk Management Committee receives reports regarding our liquidity ratios and liquidity gap ratios on a monthly basis. Based on those reports, our Risk Management Department reports these results to the Board Risk Management Committee on a quarterly basis.

Operational Risk Management

Operational risk is difficult to quantify and subject to different definitions. We define our operational risk as the risk of loss resulting from inadequate or failed internal processes, people and systems or from external events. This definition includes legal risk, but excludes strategic and reputational risk.

To monitor and control operational risks, we maintain a system of comprehensive policies and have put in place a control framework designed to provide a stable and well-managed operational environment throughout our organization. Several bodies are responsible for managing our operational risk, including our compliance department, the Risk Management Committee and the risk management group. In order to manage operational risk, we have implemented a multi-step operational risk management process consisting of engaging in risk self-assessment, establishing key risk indicators, operating an early warning system, managing loss data, measuring operational risk capital, monitoring and reporting risks, promoting a strong risk management culture and developing action plans. We have also established policies to change operational risk profiling, select permitted levels of risk, develop action plans and manage results.

We consider legal risk as a part of our operational risk. The uncertainty of the enforceability of the obligations of our customers and counterparties, including foreclosure on collateral, creates legal risk. Legal risk is higher in new areas of business where the law is often untested in the courts although such risk can also increase in our traditional business to the extent that the legal and regulatory landscape in Korea is changing and many new laws and regulations governing the banking industry remain untested. Our legal department seeks to minimize legal risk by using stringent legal documentation, employing procedures designed to ensure that transactions are properly authorized and consulting legal advisers. Our internal auditors also review loan documentation to ensure that these are correctly drawn up to withstand scrutiny in court should such scrutiny occur.

In connection with our disaster recovery capabilities, we are in the process of meeting the guidelines suggested by the Financial Services Commission. These generally require that our disaster and recovery capabilities enable us to recover data and resume operations within three hours.

The majority of our information technology systems are operated by our subsidiary, Woori FIS. We currently have a “mirror site” in operation which backs up transaction information on a real-time basis. We also

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have a “back-up site” in operation, which backs up transaction information on a daily basis. See “Item 3.D. Risk Factors—Other risks relating to our business—We may experience disruptions, delays and other difficulties from our information technology systems.”

Item 12. DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES

Fees and Charges

Under the terms of the deposit agreement, as a holder of our ADSs, you are required to pay the following service fees to the depositary:

Services	Fees
Issuance of ADSs	Up to $0.05 per ADS issued
Surrender of ADSs	Up to $0.05 per ADS surrendered
Distribution of cash dividends or other cash distributions	Up to $0.05 per ADS held
Distribution of ADSs pursuant to (i) stock dividends or other free stock distributions, or (ii) exercise of the rights to purchase additional ADSs	Up to $0.05 per ADS held
Distribution of securities other than ADSs or rights to purchase additional ADSs	Up to $0.05 per ADS held
Depositary Services	Up to $0.05 per ADS held on the applicable record date established by the depositary

As a holder of our ADSs, you are also responsible for paying certain fees and expenses incurred by the depositary and certain taxes and governmental charges such as:

• Fees for the transfer and registration of shares charged by the registrar and transfer agent for the shares in Korea (i.e., upon deposit and withdrawal of shares).

• Expenses incurred for converting foreign currency into U.S. dollars.

• Fees and expenses incurred in connection with compliance with exchange control regulations and other applicable regulatory requirements.

• Expenses for cable, telex and fax transmissions and for delivery of securities.

• Taxes and duties upon the transfer of securities (i.e., when shares are deposited or withdrawn from deposit).

• Fees and expenses incurred in connection with the delivery or servicing of shares on deposit.

Depositary fees payable upon the issuance and cancellation of ADSs are typically paid to the depositary by the brokers (on behalf of their clients) receiving the newly issued ADSs from the depositary and by the brokers (on behalf of their clients) delivering the ADSs to the depositary for cancellation. The brokers in turn charge these fees to their clients. Depositary fees payable in connection with distributions of cash or securities to ADS holders and the depositary services fee are charged by the depositary to the holders of record of ADSs as of the applicable ADS record date.

The depositary fees payable for cash distributions are generally deducted from the cash being distributed. In the case of distributions other than cash (i.e., stock dividend, rights), the depositary charges the applicable fee to the ADS record date holders concurrent with the distribution. In the case of ADSs registered in the name of the investor (whether certificated or uncertificated in direct registration), the depositary sends invoices to the applicable record date ADS holders. In the case of ADSs held in brokerage and custodian accounts (via the Depository Trust Company, or DTC), the depositary generally collects its fees through the systems provided by

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DTC (whose nominee is the registered holder of the ADSs held in DTC) from the brokers and custodians holding ADSs in their DTC accounts. The brokers and custodians who hold their clients’ ADSs in DTC accounts in turn charge their clients’ accounts the amount of the fees paid to the depositary.

In the event of refusal to pay the depositary fees, the depositary may, under the terms of the deposit agreement, refuse the requested service until payment is received or may set off the amount of the depositary fees from any distribution to be made to such holder of ADSs.

Note that the fees and charges you may be required to pay may vary over time and may be changed by us and by the depositary. You will receive prior notice of such changes.

Fees and Payments from the Depositary to Us

In 2017, pursuant to an agreement with us, the depositary waived, or made payments to third parties of, approximately $17,815 (net of applicable taxes) in the aggregate in connection with proxy process expenses (including printing, postage and distribution expenses), contributions towards investor relations efforts (including investor relations agency fees) and other standard out-of-pocket maintenance costs relating to our ADS facility that were payable by us.

In addition, as part of its service to us, the depositary waives its fees for the standard costs and operating expenses associated with the administration of the ADS facility.

Item 13. DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES

Not Applicable

Item 14. MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF PROCEEDS

Not Applicable

Item 15. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

We have evaluated, with the participation of our chief executive officer and principal financial officer, the effectiveness of our disclosure controls and procedures, as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, as of December 31, 2017. There are inherent limitations to the effectiveness of any system of disclosure controls and procedures, including the possibility of human error and the circumvention or overriding of the controls and procedures. Accordingly, even effective disclosure controls and procedures can only provide reasonable assurance of achieving their control objectives. Based upon our evaluation, our chief executive officer and principal financial officer concluded that our disclosure controls and procedures as of December 31, 2017 were effective to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit under the Exchange Act, is recorded, processed, summarized and reported, within the time periods specified in the applicable rules and forms, and that it is accumulated and communicated to our management, including our chief executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

Management’s Annual Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control system was designed to provide reasonable assurance to our management and board of directors regarding the reliability of financial reporting and the preparation and fair presentation of published financial statements in accordance with IFRS as issued by the IASB. All internal control systems, no matter how well designed, have inherent limitations. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation and may

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not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Our management maintains a comprehensive system of controls intended to ensure that transactions are executed in accordance with management’s authorization, assets are safeguarded, and financial records are reliable. Our management also takes steps to ensure that information and communication flows are effective and to monitor performance, including performance of internal control procedures.

Our management assessed the effectiveness of our internal control over financial reporting as of December 31, 2017 based on the criteria established in the Internal Control-Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission in May 2013.

Based on this assessment, management believes that, as of December 31, 2017, our internal control over financial reporting is effective.

The effectiveness of our internal control over financial reporting as of December 31, 2017 has been audited by Deloitte Anjin LLC, an independent registered public accounting firm, as stated in its report included herein which expressed an unqualified opinion on the effectiveness of our internal control over financial reporting as of December 31, 2017.

Changes in Internal Control Over Financial Reporting

There has been no change in our internal control over financial reporting during 2017 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Item 16. RESERVED

Item 16A. Audit Committee Financial Expert

Our board of directors has determined that each of Dong-Woo Chang and Sang-Hoon Shin, our outside directors and members of our Audit Committee, qualifies as an “audit committee financial expert” and is independent within the meaning of this Item 16A.

Item 16B. Code of Ethics

We have adopted a code of ethics, as defined in Item 16B of Form 20-F under the Exchange Act. Our code of ethics applies to our chief executive officer, principal financial officer and persons performing similar functions as well as to our outside directors and other officers and employees. Our code of ethics is available on our website at http://www.wooribank.com. If we amend the provisions of our code of ethics that apply to our chief executive officer and principal financial officer and persons performing similar functions, or if we grant any waiver of such provisions, we will disclose such amendment or waiver on our website at the same address.

Item 16C. Principal Accountant Fees and Services

The following table sets forth the fees billed to us by our independent registered public accountants, Deloitte Anjin LLC, the member firms of Deloitte Touche Tohmatsu Limited, and their respective affiliates (which we refer to collectively as Deloitte), during the fiscal years ended December 31, 2015, 2016 and 2017:

	Year ended December 31,
	2015		2016		2017
	(in millions of Won)
Audit fees	￦	3,272	￦	3,405	￦	3,590
Audit-related fees		202		121		—
Tax fees		163		170		169
All other fees		—		—		—
Total fees	￦	3,637	￦	3,696	￦	3,496

204

Audit fees in the above table are the aggregate fees billed or expected to be billed by Deloitte in connection with the audit of our annual financial statements, the review of our interim financial statements, the review of filings with the U.S. Securities and Exchange Commission and audit of the effectiveness of our internal control over financial reporting.

Audit-related fees in the above table are the aggregate fees billed or expected to be billed by Deloitte for agreed upon procedures related to the issuance of comfort letters in connection with the issuance of debt securities.

Tax fees in the above table are fees billed or expected to be billed by Deloitte for assistance in the preparation of certain tax returns and other tax advice.

Audit Committee Pre-Approval Policies and Procedures

Our Audit Committee pre-approves all audit services to be provided by Deloitte Anjin LLC, our independent auditors. Our Audit Committee’s policy regarding the pre-approval of non-audit services to be provided to us by our independent auditors is that all such services shall be pre-approved by our Audit Committee. Non-audit services that are prohibited to be provided to us by our independent auditors under the rules of the SEC and applicable law may not be pre-approved. In addition, prior to the granting of any pre-approval, our Audit Committee must be satisfied that the performance of the services in question will not compromise the independence of our independent auditors. Our Audit Committee also pre-approves the selection or replacement of the independent auditors of our subsidiaries.

Our Audit Committee did not pre-approve any non-audit services under the de minimis exception of Rule 2-01(c)(7)(i)(C) of Regulation S-X as promulgated by the U.S. Securities and Exchange Commission.

Item 16D. Exemptions from the Listing Standards for Audit Committees

Not Applicable

Item 16E. Purchase of Equity Securities by the Issuer and Affiliated Purchasers

Neither we nor any “affiliated purchaser,” as defined in Rule 10b-18(a)(3) of the Exchange Act, purchased any of our equity securities during the period covered by this annual report.

Item 16F. Change in Registrant’s Certifying Accountant

Not Applicable

Item 16G. Corporate Governance

Differences in Corporate Governance Practices

Pursuant to the rules of the New York Stock Exchange applicable to foreign private issuers like us that are listed on the New York Stock Exchange, we are required to disclose significant differences between the New York Stock Exchange’s corporate governance standards and those that we follow under Korean law. The following is a summary of such significant differences.

NYSE Corporate Governance Standards	Woori Bank
Director Independence
Listed companies must have a majority of independent directors.	The majority of our board of directors is independent (as defined in accordance with the New York Stock Exchange’s standards), as five of our eight directors are outside directors.
Executive Session
Non-management directors must meet in regularly scheduled executive sessions without management.	Our outside directors hold quarterly meetings, which coincide with the quarterly Audit Committee

205

Independent directors should meet alone in an executive session at least once a year.	meetings, to discuss matters relating to management issues. The Audit Committee consists of two outside directors and one standing director.
Nomination/Corporate Governance Committee
A nomination/corporate governance committee of independent directors is required. The committee must have a charter that addresses the purpose, responsibilities (including development of corporate governance guidelines) and annual performance evaluation of the committee.	We have established a separate Board of Directors Management Committee, which consists of one standing director, one non-standing director and five outside directors.
Compensation Committee
A compensation committee of independent directors is required. The committee must have a charter that addresses the purpose, responsibilities and annual performance evaluation of the committee. The charter must be made available on the company’s website. In addition, in accordance with the SEC rules adopted pursuant to Section 952 of the Dodd-Frank Act, NYSE listing standards were amended to expand the factors relevant in determining whether a committee member has a relationship to the company that will materially affect that member’s duties to the compensation committee. Additionally, the committee may obtain or retain the advice of a compensation adviser only after taking into consideration all factors relevant to determining that adviser’s independence from management.	We maintain a Compensation Committee consisting of one non-standing director and five outside directors.
Audit Committee
Listed companies must have an audit committee that satisfies the independence and other requirements of Rule 10A-3 under the Exchange Act. All members must be independent. The committee must have a charter addressing the committee’s purpose, an annual performance evaluation of the committee, and the duties and responsibilities of the committee. The charter must be made available on the company’s website.	We maintain an Audit Committee comprised of two outside directors and one standing director, all of whom are independent. Accordingly, we are in compliance with Rule 10A-3 under the Exchange Act.
Audit Committee Additional Requirements
Listed companies must have an audit committee that is composed of at least three directors.	Our Audit Committee has three members, as described above.
Shareholder Approval of Equity Compensation Plan
Listed companies must allow its shareholders to exercise their voting rights with respect to any material revision to the company’s equity compensation plan.	We currently have one equity compensation plan, providing for the grant of stock options to officers and directors.
	All material matters related to the granting of stock options are provided in our articles of incorporation, and any amendments to the articles of incorporation are subject to shareholders’ approval.

206

Corporate Governance Guidelines
Listed companies must adopt and disclose corporate governance guidelines.	We have adopted corporate governance standards, the Korean-language version of which is available on our website.
Code of Business Conduct and Ethics
Listed companies must adopt and disclose a code of business conduct and ethics for directors, officers and employees, and promptly disclose any waivers of the code for directors or executive officers.	We have adopted a Code of Ethics and Business Conduct for Employees, the Korean-language version of which is available on our website.

Item 16H. Mine Safety Disclosure

Not Applicable

Item 17. FINANCIAL STATEMENTS

Not Applicable

Item 18. FINANCIAL STATEMENTS

Reference is made to Item 19(a) for a list of all financial statements filed as part of this annual report.

207

Item 19. EXHIBITS

(a) List of financial statements:

	Page
Audited consolidated financial statements of Woori Bank and subsidiaries prepared in accordance with IFRS as issued by the IASB
Report of Independent Registered Public Accounting Firm		F-1
Consolidated Statements of Financial Position as of December  31, 2016 and 2017		F-3
Consolidated Statements of Comprehensive Income for the Years Ended December 31, 2015, 2016 and 2017		F-4
Consolidated Statements of Changes in Equity for the Years Ended December 31, 2015, 2016 and 2017		F-5
Consolidated Statements of Cash Flows for the Years Ended December  31, 2015, 2016 and 2017		F-7
Notes to Consolidated Financial Statements		F-9

(b) Exhibits

Pursuant to the rules and regulations of the U.S. Securities and Exchange Commission, we have filed certain agreements as exhibits to this Annual Report on Form 20-F. These agreements may contain representations and warranties made by the parties. These representations and warranties have been made solely for the benefit of the other party or parties to such agreements and (i) may be intended not as statements of fact, but rather as a way of allocating the risk to one of the parties to such agreements if those statements turn out to be inaccurate, (ii) may have been qualified by disclosures that were made to such other party or parties and that either have been reflected in the company’s filings or are not required to be disclosed in those filings, (iii) may apply materiality standards different from what may be viewed as material to investors and (iv) were made only as of the date of such agreements or such other date(s) as may be specified in such agreements and are subject to more recent developments. Accordingly, these representations and warranties may not describe our actual state of affairs at the date of this annual report.

Number	Description
1.1*	Articles of Incorporation of Woori Bank (translation in English).
2.1**	Form of Stock Certificate of Woori Bank’s common stock, par value ￦5,000 per share (translation in English).
2.2***	Form of Deposit Agreement among Woori Bank, Citibank, N.A., as depositary, and all holders and beneficial owners of American depositary shares evidenced by American depositary receipts, including the form of American depositary receipt.
4.1****	Agreement between the Korea Deposit Insurance Corporation and Woori Bank in Connection with the Sale of Woori Bank Shares (translation in English).
8.1*****	List of subsidiaries of Woori Bank.
11.1**	Code of Ethics (translation in English).
12.1	Section 302 certifications.
13.1	Section 906 certifications.
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

208

* Incorporated by reference to exhibit 1.1 to the Annual Report on Form 20-F (File No. 001-31811), filed on April 27, 2017.

** Incorporated by reference to the corresponding exhibit to the Annual Report on Form 20-F (File No. 001-31811), filed on April 30, 2015.

*** Incorporated by reference to exhibit (a) to the Registration Statement on Form F-6 (File No. 333-199370), filed on October 15, 2014.

**** Incorporated by reference to exhibit 4.1 to the Annual Report on Form 20-F (File No. 001-31811), filed on April 27, 2017.

***** Incorporated by reference to Note 1 of the notes to the consolidated financial statements of the registrant included in this Annual Report.

209

SIGNATURES

The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this annual report on its behalf.

Woori Bank

(Registrant)

/s/     Tae-Seung Sohn

(Signature)

Tae-Seung Sohn

President and Chief Executive Officer

(Name/Title)

Date: April 30, 2018

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the shareholders and the Board of Directors of Woori Bank

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Woori Bank and subsidiaries (the “Group”) as of December 31, 2017, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Group maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control—Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2017 of the Group and our report dated April 30, 2018, expressed an unqualified opinion on those financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Group’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Group in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/    DELOITTE ANJIN LLC

Seoul, Korea

April 30, 2018

F-1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the shareholders and the Board of Directors of Woori Bank

Opinion on the Financial Statements

We have audited the accompanying consolidated statements of the financial position of Woori Bank and subsidiaries (the “Group”) as of December 31, 2016 and 2017, the related consolidated statements of comprehensive income, changes in equity, and cash flows for each of the three years in the period ended December 31, 2017 (all expressed in Korean Won), and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Group as of December 31, 2016 and 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017, in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Group’s internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated April 30, 2018, expressed an unqualified opinion on the Group’s internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Group’s management. Our responsibility is to express an opinion on the Group’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Group in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/    DELOITTE ANJIN LLC

Seoul, Korea

April 30, 2018

We have served as the Company’s auditor since 2002.

F-2

WOORI BANK AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION

AS OF DECEMBER 31, 2016 AND 2017

	Korean Won						U.S. Dollars
	December 31, 2016			December 31, 2017			December 31, 2017
	(in millions)						(in thousands) (Note 2)
ASSETS
Cash and cash equivalents (Note 6)		7,591,324			6,908,286			6,471,947
Financial assets at fair value through profit or loss (Notes 4,7,11,12,18 and 26)		5,650,724			5,843,077			5,474,019
Available-for-sale financial assets (Notes 4,8,11,12 and 18)		20,817,583			15,352,950			14,383,232
Held-to-maturity financial assets (Notes 4,9,11,12 and 18)		13,910,251			16,749,296			15,691,383
Loans and receivables (Notes 4,10,11,12,18 and 45)		258,392,633			267,106,204			250,235,337
Investments in joint ventures and associates (Note 13)		439,012			417,051			390,709
Investment properties (Note 14)		358,497			371,301			347,849
Premises and equipment (Notes 15 and 18)		2,458,025			2,477,545			2,321,059
Intangible assets and goodwill (Note 16)		483,739			518,599			485,844
Assets held for sale (Note 17)		2,342			48,624			45,553
Current tax assets (Note 42)		6,229			4,722			4,424
Deferred tax assets (Note 42)		232,007			280,130			262,436
Derivative assets (Notes 4,11,12 and 26)		140,577			59,272			55,529
Net defined benefit assets (Note 24)		70,938			—			—
Other assets (Notes 19 and 45)		128,846			158,404			148,399
Total assets		310,682,727			316,295,461			296,317,720
LIABILITIES
Financial liabilities at fair value through profit or loss (Notes 4,11,12,20 and 26)		3,803,358			3,427,909			3,211,397
Deposits due to customers (Notes 4,11,21 and 45)		221,020,411			234,695,084			219,871,357
Borrowings (Notes 4,6,11,12 and 22)		18,769,515			14,784,706			13,850,880
Debentures (Notes 4,6,11 and 22)		23,565,449			27,869,651			26,109,358
Provisions (Notes 23, 44 and 45)		428,477			410,470			384,544
Net defined benefit liability (Note 24)		64,666			43,264			40,531
Current tax liabilities (Note 42)		171,192			232,600			217,909
Deferred tax liabilities (Note 42)		22,023			22,681			21,249
Derivative liabilities (Notes 4,11,12 and 26)		7,221			67,754			63,475
Other financial liabilities (Notes 4,11,12, 25 and 45)		21,985,086			13,892,461			13,014,991
Other liabilities (Notes 25 and 45)		299,376			283,981			266,041
Total liabilities		290,136,774			295,730,561			277,051,732
EQUITY
Owners’ equity:		20,386,160			20,365,892			19,079,549
Capital stock (Note 28)		3,381,392			3,381,392			3,167,818
Hybrid securities (Note 29)		3,574,896			3,017,888			2,827,273
Capital surplus (Note 28)		286,331			285,880			267,824
Other equity (Note 30)		(1,468,025	)		(1,939,274	)		(1,816,787	)
Retained earnings (Notes 31 and 32)		14,611,566			15,620,006			14,633,421
Non-controlling interests		159,793			199,008			186,439
Total equity		20,545,953			20,564,900			19,265,988
Total liabilities and equity		310,682,727			316,295,461			296,317,720

See notes to consolidated financial statements.

F-3

WOORI BANK AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

FOR THE YEARS ENDED DECEMBER 31, 2015, 2016 AND 2017

	Korean Won									U.S. Dollars
	2015			2016			2017			2017
	(in millions, except for per share data)									(in thousands, except per share data) (Note 2)
Interest income		8,698,235			8,512,312			8,550,687			8,010,611
Interest expense		(3,936,335	)		(3,492,768	)		(3,330,037	)		(3,119,707	)
Net interest income (Notes 34 and 45)		4,761,900			5,019,544			5,220,650			4,890,904
Fees and commissions income		1,757,340			1,865,470			2,069,198			1,938,504
Fees and commissions expense		(780,544	)		(928,339	)		(998,732	)		(935,651	)
Net fees and commissions income (Notes 35 and 45)		976,796			937,131			1,070,466			1,002,853
Dividend income (Note 36)		102,923			184,510			124,992			117,097
Net gain (loss) on financial instruments at fair value through profit or loss (Note 37)		240,342			114,387			(104,827	)		(98,206	)
Net gain (loss) on available-for-sale financial assets (Note 38)		(3,281	)		(1,035	)		192,708			180,536
Impairment losses due to credit loss (Notes 39 and 45)		(966,646	)		(834,076	)		(785,133	)		(735,543	)
General and administrative expenses (Notes 40 and 45)		(3,150,387	)		(3,478,476	)		(3,530,801	)		(3,307,789	)
Net other operating expenses (Notes 40 and 45)		(610,061	)		(367,779	)		(31,313	)		(29,334	)
Operating income		1,351,586			1,574,206			2,156,742			2,020,518
Share of losses of joint ventures and associates (Note 13)		(70,124	)		(19,507	)		(101,514	)		(95,102	)
Other net non-operating income (expense) (Note 41)		170,484			(1,310	)		(105,722	)		(99,044	)
Non-operating income (loss)		100,360			(20,817	)		(207,236	)		(194,146	)
Net income before income tax expense		1,451,946			1,553,389			1,949,506			1,826,372
Income tax expense (Note 42)		(376,554	)		(275,856	)		(419,418	)		(392,927	)
Net income		1,075,392			1,277,533			1,530,088			1,433,445
Remeasurement of the net defined benefit liability		(78,267	)		34,162			10,497			9,834
Items that will not be reclassified to profit or loss		(78,267	)		34,162			10,497			9,834
Gain (loss) on available-for-sale financial assets		72,297			12,586			(84,498	)		(79,161	)
Share of other comprehensive income (loss) of joint ventures and associates		3,295			(7,937	)		612			574
Gain on foreign currency translation of foreign operations		33,837			28,712			(208,329	)		(195,171	)
Gain (loss) on valuation of cash flow hedge		—			10,371			777			728
Equity related to assets held for sale		—			—			4,145			3,883
Items that may be reclassified to profit or loss		109,429			43,732			(287,293	)		(269,147	)
Other comprehensive income (loss), net of tax		31,162			77,894			(276,796	)		(259,313	)
Total comprehensive income		1,106,554			1,355,427			1,253,292			1,174,132
Net income attributable to:
Net income attributable to owners		1,059,157			1,261,266			1,512,148			1,416,638
Net Income (loss) attributable to non-controlling interests		16,235			16,267			17,940			16,807
Total comprehensive income attributable to:
Comprehensive income attributable to owners		1,094,870			1,332,614			1,249,057			1,170,164
Comprehensive income (loss) attributable to non-controlling interests		11,684			22,813			4,235			3,969
Basic and diluted earnings from continuing and discontinued operations per share (Note 43)(Unit: Korean Won and U.S. Dollar)		1,301			1,567			1,999			1.873
Basic and diluted earnings from continuing operations per share (Note 43) (Unit: Korean Won and U.S. Dollar)		1,301			1,567			1,999			1.873

See notes to consolidated financial statements.

F-4

WOORI BANK AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

FOR THE YEARS ENDED DECEMBER 31, 2015, 2016 AND 2017

	Capital stock		Hybrid securities			Capital surplus			Other equity			Retained earnings			Owners’ equity			Non- controlling interests			Total equity
	(Korean Won in millions)
January 1, 2015		3,381,392		2,538,823			291,066			(2,393,138	)		14,165,358			17,983,501			109,924			18,093,425
Net income		—		—			—			—			1,059,157			1,059,157			16,235			1,075,392
Dividends		—		—			—			—			(504,952	)		(504,952	)		(824	)		(505,776	)
Change in ownership interest of investments in consolidated subsidiaries and others		—		—			3,193			—			—			3,193			660			3,853
Gain (loss) on valuation of available-for-sale financial assets		—		—			—			73,691			—			73,691			(1,394	)		72,297
Share of other comprehensive income of joint ventures and associates		—		—			—			3,295			—			3,295			—			3,295
Gain (loss) on foreign currencies translation of foreign operations		—		—			—			36,932			—			36,932			(3,095	)		33,837
Remeasurement of the net defined benefit liability		—		—			—			(78,204	)		—			(78,204	)		(63	)		(78,267	)
Dividends to hybrid securities		—		—			—			—			(183,320	)		(183,320	)		—			(183,320	)
Issuance of hybrid securities		—		795,179			—			—			—			795,179			—			795,179
Retirement of treasury stock		—		—			—			3,481			(3,481	)		—			—			—
Appropriation of merger losses		—		—			—			806,640			(806,640	)		—			—			—
December 31, 2015		3,381,392		3,334,002			294,259			(1,547,303	)		13,726,122			19,188,472			121,443			19,309,915
	Capital stock		Hybrid securities			Capital surplus			Other equity			Retained earnings			Owners’ equity			Non- controlling interests			Total equity
January 1, 2016		3,381,392		3,334,002			294,259			(1,547,303	)		13,726,122			19,188,472			121,443			19,309,915
Net income		—		—			—			—			1,261,266			1,261,266			16,267			1,277,533
Dividends		—		—			—			—			(168,317	)		(168,317	)		(1,286	)		(169,603	)
Change in capital surplus of consolidated subsidiaries		—		—			(7,928	)		7,930			—			2			—			2
Changes in non-controlling interests due to acquisition of subsidiary		—		—			—			—			—			—			16,823			16,823
Gain on valuation of available-for-sale financial assets		—		—			—			12,296			—			12,296			290			12,586
Share of other comprehensive loss of joint ventures and associates		—		—			—			(7,937	)		—			(7,937	)		—			(7,937	)
Gain on foreign currencies translation of foreign operations		—		—			—			22,436			—			22,436			6,276			28,712
Remeasurement of the net defined benefit liability		—		—			—			34,182			—			34,182			(20	)		34,162
Gain on valuation of cash flow hedge		—		—			—			10,371			—			10,371			—			10,371
Dividends to hybrid securities		—		—			—			—			(206,515	)		(206,515	)		—			(206,515	)
Issuance of hybrid securities		—		549,904			—			—			—			549,904			—			549,904
Repayment of hybrid securities		—		(309,010	)		—			—			(990	)		(310,000	)		—			(310,000	)
December 31, 2016		3,381,392		3,574,896			286,331			(1,468,025	)		14,611,566			20,386,160			159,793			20,545,953

F-5

WOORI BANK AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY—(CONTINUED)

FOR THE YEARS ENDED DECEMBER 31, 2015, 2016 AND 2017

	Capital stock		Hybrid securities			Capital surplus			Other equity			Retained earnings			Owners’ equity			Non- controlling interests			Total equity
January 1, 2017		3,381,392		3,574,896			286,331			(1,468,025	)		14,611,566			20,386,160			159,793			20,545,953
Net income		—		—			—			—			1,512,148			1,512,148			17,940			1,530,088
Dividends		—		—			—			—			(336,636	)		(336,636	)		(1,554	)		(338,190	)
Subsidiary capital increase		—		—			(451	)		—			—			(451	)		36,534			36,083
Gain(loss) on valuation of available-for-sale financial assets		—		—			—			(85,051	)		—			(85,051	)		553			(84,498	)
Share of other comprehensive gain of joint ventures and associates		—		—			—			612			—			612			—			612
Loss on foreign currencies translation of foreign operations		—		—			—			(194,347	)		—			(194,347	)		(13,982	)		(208,329	)
Gain on valuation of cash flow hedge		—		—			—			777			—			777			—			777
Remeasurement of the net defined benefit liability		—		—			—			10,773			—			10,773			(276	)		10,497
Equity related to assets held for sale		—		—			—			4,145			—			4,145			—			4,145
Dividends on hybrid securities		—		—			—			—			(167,072	)		(167,072	)		—			(167,072	)
Issuance of hybrid securities		—		559,565			—			—			—			559,565			—			559,565
Redemption of hybrid securities		—		(1,116,573	)		—			(208,158	)		—			(1,324,731	)		—			(1,324,731	)
December 31, 2017		3,381,392		3,017,888			285,880			(1,939,274	)		15,620,006			20,365,892			199,008			20,564,900
	Capital stock		Hybid securities			Capital surplus			Other equity			Retained earnings			Owners’ equity			Non- controlling interests			Total equity
	(U.S. Dollars in thousands)
January 1, 2017		3,167,818		3,349,100			268,246			(1,375,303	)		13,688,675			19,098,536			149,700			19,248,236
Net income		—		—			—			—			1,416,638			1,416,638			16,807			1,433,445
Dividends		—		—			—			—			(315,373	)		(315,373	)		(1,456	)		(316,829	)
Subsidiary capital increase		—		—			(422	)		—			—			(422	)		34,227			33,805
Gain(loss) on valuation of available-for-sale financial assets		—		—			—			(79,679	)		—			(79,679	)		518			(79,161	)
Share of other comprehensive gain of joint ventures and associates		—		—			—			574			—			574			—			574
Loss on foreign currencies translation of foreign operations		—		—			—			(182,072	)		—			(182,072	)		(13,099	)		(195,171	)
Gain on valuation of cash flow hedge		—		—			—			728			—			728			—			728
Remeasurement of the net defined benefit liability		—		—			—			10,092			—			10,092			(258	)		9,834
Equity related to assets held for sale		—		—			—			3,883			—			3,883			—			3,883
Dividends on hybrid securities		—		—			—			—			(156,519	)		(156,519	)		—			(156,519	)
Issuance of hybrid securities		—		524,222			—			—			—			524,222			—			524,222
Redemption of hybrid securities		—		(1,046,049	)		—			(195,010	)		—			(1,241,059	)		—			(1,241,059	)
December 31, 2017		3,167,818		2,827,273			267,824			(1,816,787	)		14,633,421			19,079,549			186,439			19,265,988

See notes to consolidated financial statements.

F-6

WOORI BANK AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

FOR THE YEARS ENDED DECEMBER 31, 2015, 2016 AND 2017

	Korean Won									U.S. Dollars
	2015			2016			2017			2017
	(in millions)									(in thousands) (Note 2)
Cash flows from operating activities:
Net income		1,075,392			1,277,533			1,530,088			1,433,445
Adjustments:
Income tax expense		376,554			275,856			419,418			392,927
Interest income		(8,698,235	)		(8,512,312	)		(8,550,687	)		(8,010,611	)
Interest expense		3,936,335			3,492,768			3,330,037			3,119,707
Dividend income		(102,923	)		(184,510	)		(124,992	)		(117,097	)
Impairment losses due to credit loss		966,646			834,076			785,133			735,543
Loss on valuation of financial instruments at fair value through profit or loss		—			—			15,267			14,302
Loss on available-for-sale financial assets		3,281			1,035			—			—
Share of losses of investments in joint ventures and associates		111,487			56,264			185,020			173,334
Loss on transaction of derivatives / valuation of derivatives		20,982			98,981			109,569			102,648
Loss on fair value hedged items		56,532			475			—			—
Provisions		72,062			34,774			107,028			100,268
Retirement benefits		132,131			152,609			142,902			133,876
Depreciation and amortization		240,764			252,031			235,795			220,901
Loss on disposal of investments in joint ventures and associates		10			15,060			38,713			36,268
Loss on disposal of premises and equipment and other assets		2,707			9,718			9,994			9,363
Impairment loss on premises and equipment and other assets		2,990			1,936			390			365
Gain on valuation of financial instruments at fair value through profit or loss		(55,773	)		(75,690	)		—			—
Gain on available-for-sale financial assets		—			—			(192,708	)		(180,536	)
Share of profits of investments in joint ventures and associates		(41,363	)		(36,757	)		(83,506	)		(78,232	)
Gain on transaction of derivatives / valuation of derivatives		(59,003	)		(130	)		(122	)		(114	)
Gain on fair value hedged items		(25,235	)		(99,302	)		(53,532	)		(50,150	)
Reversal of provisions		(854	)		(1,396	)		(2,567	)		(2,405	)
Gain on disposal of investments in joint ventures and associates		(61,653	)		(23,457	)		(39,932	)		(37,410	)
Gain on disposal of premises and equipment and other assets		(6,814	)		(1,885	)		(5,028	)		(4,711	)
Reversal of impairment loss on premises and equipment and other assets		(539	)		(3,581	)		(666	)		(624	)
Changes in operating assets and liabilities:
Financial instruments at fair value through profit or loss		(495,507	)		(99,581	)		(583,068	)		(546,241	)
Loans and receivables		(23,150,910	)		(14,433,390	)		(9,647,563	)		(9,038,208	)
Other assets		1,922			219,323			35,953			33,682
Deposits due to customers		20,620,287			11,878,628			13,634,873			12,773,672
Provision for guarantee and loan commitment		(66,399	)		34,376			(122,711	)		(114,960	)
Net defined benefit liability		(255,585	)		(261,097	)		(46,789	)		(43,834	)
Other financial liabilities		1,205,411			5,158,055			(7,966,786	)		(7,463,591	)
Other liabilities		(91,116	)		(6,163	)		(27,550	)		(25,811	)
Cash received from (paid for) operating activities:
Interest income received		8,692,851			8,511,349			8,570,715			8,029,375
Interest expense paid		(4,355,880	)		(3,593,358	)		(3,404,608	)		(3,189,567	)
Dividends received		100,368			184,674			127,343			119,300
Income tax paid		(534,829	)		(251,627	)		(404,428	)		(378,884	)
Net cash provided by (used in) operating activities		(383,906	)		4,905,285			(1,979,005	)		(1,854,010	)

(Continued)

F-7

WOORI BANK AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS—(CONTINUED)

FOR THE YEARS ENDED DECEMBER 31, 2015, 2016 AND 2017

	Korean Won									U.S. Dollars
	2015			2016			2017			2017
	(in millions)									(in thousands) (Note 2)
Cash flows from investing activities:
Disposal of available-for-sale financial assets		18,426,846			20,395,744			24,912,752			23,339,222
Redemption of held-to-maturity financial assets		6,404,711			8,462,346			8,587,092			8,044,717
Disposal of investments in joint ventures and associates		75,599			97,135			70,180			65,747
Disposal of subsidiaries		—			—			203			191
Disposal of investment properties		—			—			418			392
Disposal of premises and equipment		18,600			63			7,428			6,959
Disposal of intangible assets		1,782			4,325			1,188			1,113
Disposal of assets held for sale		3,711			22,723			24,808			23,241
Decrease of derivatives for hedging		56,956			—			—			—
Net cash flows through business combination (Note 46)		(38,535	)		(132,301	)		—			—
Acquisition of available-for-sale financial assets		(16,305,797	)		(23,844,849	)		(19,674,346	)		(18,431,682	)
Acquisition of held-to-maturity financial assets		(7,138,013	)		(8,818,376	)		(11,521,065	)		(10,793,376	)
Acquisition of investments in joint ventures and associates		(1,098	)		(43,281	)		(143,161	)		(134,119	)
Acquisition of investment properties		—			(4,428	)		(9,872	)		(9,248	)
Acquisition of premises and equipment		(129,454	)		(131,009	)		(162,245	)		(151,998	)
Acquisition of intangible assets		(97,891	)		(191,161	)		(195,929	)		(183,552	)
Increase of derivatives for hedging		(3,273	)		(42,544	)		(13,742	)		(12,874	)
Net cash provided by (used in) investing activities		1,274,144			(4,225,613	)		1,883,709			1,764,733
Cash flows from financing activities:
Increase in borrowings		12,674,649			8,259,380			9,057,999			8,485,881
Issuance of debentures		13,502,777			15,848,055			18,438,221			17,273,633
Issuance of hybrid securities		795,179			549,904			559,565			524,222
Capital increase of subsidiaries		—			—			35,841			33,578
Increase of paid in capital in subsidiaries		3,787			—			—			—
Decrease in borrowings		(10,346,919	)		(9,524,626	)		(12,692,883	)		(11,891,179	)
Repayment of debentures		(16,425,353	)		(14,118,720	)		(13,620,520	)		(12,760,226	)
Dividends paid		(504,952	)		(168,317	)		(336,636	)		(315,373	)
Dividends paid on hybrid securities		(179,758	)		(201,328	)		(177,730	)		(166,505	)
Repayment of hybrid securities		—			(310,000	)		(1,323,400	)		(1,239,812	)
Dividends paid on non-controlling interests		(824	)		(1,286	)		(1,554	)		(1,456	)
Net cash provided by (used in) financing activities		(481,414	)		333,062			(61,097	)		(57,237	)
Net increase (decrease) in cash and cash equivalents		408,824			1,012,734			(156,393	)		(146,514	)
Cash and cash equivalents, beginning of the period		5,962,861			6,644,055			7,591,324			7,111,843
Effects of exchange rate changes on cash and cash equivalents		272,370			(65,465	)		(526,645	)		(493,382	)
Cash and cash equivalents, end of the period (Note 6)		6,644,055			7,591,324			6,908,286			6,471,947

See notes to consolidated financial statements

F-8

WOORI BANK AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

FOR THE YEARS ENDED DECEMBER 31, 2015, 2016 AND 2017

1. GENERAL

(1) Summary of the parent company

Woori Bank (hereinafter referred to the “Bank”), which is a controlling entity in accordance with International Financial Reporting Standards (“IFRS”) 10—Consolidated Financial Statements, was established in 1899 and is engaged in the commercial banking business under the Banking Act, trust business under the Financial Investment Services and Capital Market Act, and foreign currencies exchange business with approval from the Bank of Korea (“BOK”) and the Ministry of Finance and Economy (“MOFE”).

Previously, Woori Finance Holdings Co., Ltd., the former holding company of Woori Financial Group, established on March 27, 2001 held a 100% ownership of the Bank. Effective November 1, 2014, Woori Finance Holdings Co., Ltd. completed its merger with and into Woori Bank, its wholly-owned subsidiary, as contemplated by the merger agreement dated July 28, 2014, by and between Woori Finance Holdings Co., Ltd. and Woori Bank. Accordingly, the shares of the Bank, 597 million shares, prior to the merger, were reduced to nil in accordance with capital reduction procedure, and then, in accordance with the merger ratio, the Bank newly issued 676 million shares. As a result, as of December 31, 2017, the common stock of the Bank amounts, expressed in Korean Won (the “KRW” or “Won”), to 3,381,392 million Won.

During the year ended December 31, 2016, the Korea Deposit Insurance Corporation (“KDIC”), as the majority shareholder of the Bank, sold 187 million shares in the Bank in accordance with the contract of ‘Disposal of Woori Bank’s shares to Oligopolistic Shareholders’. In addition to the sale, during the year ended December 31, 2017, KDIC sold additional 33 million shares. As of December 31, 2016 and 2017, KDIC held 158 million shares and 125 million shares (23.37% and 18.43% ownership interest) respectively, of the Bank’s shares issued.

On June 24, 2002, Woori Finance Holdings Co., Ltd. listed its common shares on the Korea Exchange through public offering. In addition, on September 29, 2003, the holding company registered with the Securities and Exchange Commission in the United States of America and, on the same day, listed its American Depositary Shares on the New York Stock Exchange. As Woori Finance Holdings Co., Ltd. was merged into the Bank, the Bank, which is the existing company, succeeded such rights and obligations as a listed company on the Korea Exchange and the New York Stock Exchange.

As a result of such merger, the Bank incorporated Woori Card Co., Ltd., Woori Investment Bank Co., Ltd., Woori FIS Co., Ltd., Woori Private Equity Asset Management Co., Ltd., and Woori Finance Research Institute Co., Ltd. as its subsidiaries.

The head office of the Bank is located in 51 Sogong-ro, Jung Gu, Seoul, Korea. The Bank has 876 branches and offices in Korea, and 23 branches and offices overseas as of December 31, 2017.

F-9

(2) The consolidated financial statements for Woori Bank and its subsidiaries (the “Group”) include the following subsidiaries:

			Percentage of ownership (%)
Subsidiaries	Main business		December 31, 2016		December 31, 2017
Woori Bank:
Woori FIS Co., Ltd.		System software development & maintenance		100.0		100.0
Woori Private Equity Asset Management Co., Ltd.		Finance		100.0		100.0
Woori Finance Research Institute Co., Ltd.		Other service business		100.0		100.0
Woori Card Co., Ltd.		Finance		100.0		100.0
Woori Investment Bank Co., Ltd.(*1)		Other credit finance business		58.2		59.8
Woori Credit Information Co., Ltd.		Credit information		100.0		100.0
Woori America Bank		Finance		100.0		100.0
Woori Global Markets Asia Limited		”		100.0		100.0
Woori Bank China Limited		”		100.0		100.0
AO Woori Bank		”		100.0		100.0
PT Bank Woori Saudara Indonesia 1906 Tbk(*1)		”		74.0		79.9
Banco Woori Bank do Brasil S.A.		”		100.0		100.0
Korea BTL Infrastructure Fund		”		99.9		99.9
Woori Fund Service Co., Ltd.		”		100.0		100.0
Woori Finance Cambodia PLC.		”		100.0		100.0
Woori Finance Myanmar Co., Ltd.		”		100.0		100.0
Wealth Development Bank		”		51.0		51.0
Woori Bank Vietnam Limited		”		100.0		100.0
Kumho Trust First Co., Ltd.(*2)		Asset securitization		0.0		0.0
Asiana Saigon Inc.(*2)		”		0.0		0.0
An-Dong Raja First Co., Ltd.(*6)		”		0.0		—
Consus Eighth Co., LLC(*2)		”		0.0		0.0
KAMCO Value Recreation First Securitization Specialty Co., Ltd.(*2)		”		15.0		15.0
Hermes STX Co., Ltd.(*2)		”		0.0		0.0
BWL First Co., LLC(*2)		”		0.0		0.0
Woori Poongsan Co., Ltd.(*6)		”		0.0		—
Deogi Dream Fourth Co., Ltd.(*2)		”		0.0		0.0
Jeonju Iwon Ltd.(*2)		”		0.0		0.0
Wonju I one Inc.(*2)		”		0.0		0.0
Heitz Third Co., Ltd.(*2)		”		0.0		0.0
Woorihansoop 1st Co., Ltd.(*2)		”		0.0		0.0
Electric Cable First Co., Ltd(*2)		”		0.0		0.0
Woori International First Co., Ltd.(*2)		”		0.0		0.0
Woori HJ First Co., Ltd.(*2)		”		0.0		0.0
Woori WEBST 1st Co., Ltd.(*2)		”		—		0.0
HNLD 1st Inc.(*2)		”		—		0.0
Wibihansoop 1st Co., Ltd.(*2)		”		—		0.0
Uri QS 1st Co., Ltd(*2)		”		—		0.0
Uri Display 1st Co., Ltd.(*2)		”		—		0.0
Tiger Eyes 2nd Co., Ltd.(*2)		”		—		0.0
Woori Serveone 1st Co., Ltd.(*2)		”		—		0.0
HeungkukWoori Tech Company Private Placement Investment Trust No.1 and 5 beneficiary certificates(*3)		Securities investment and others		—		—
Principle Guaranteed Trust(*4)		Trust		0.0		0.0
Principle and Interest Guaranteed Trust(*4)		”		0.0		0.0
Woori Bank and Woori Private Equity Asset Management Co., Ltd.:
Woori Private Equity Fund(*5)		Other financial business		31.9		—
Woori Private Equity Fund:
Woori EL Co., Ltd.(*5)		Other financial business		100.0		—
Woori Investment Bank:
Dongwoo First Securitization Specialty Co., Ltd.(*2)		Asset securitization		5.0		5.0
Seari First Securitization Specialty Co., Ltd.(*2)		Asset securitization		—		5.0
Namjong 1st Securitization Specialty Co., Ltd.(*2)		”		—		5.0
Bukgeum First Securitization Specialty Co., Ltd.(*2)		”		—		5.0
Woori Card Co., Ltd.:
TUTU Finance-WCI Myanmar Co., Ltd.		Finance		100.0		100.0
Woori Card one of 2017-1 Securitization Specialty Co., Ltd.(*2)		Asset securitization		—		0.5
Woori Card one of 2017-2 Securitization Specialty Co., Ltd.(*2)		”		—		0.5

F-10

(*1) The entity issued a rights offering that entitles its existing shareholders to buy additional shares directly from the entity in proportion to its existing holders. But, some shareholders opted not to buy the new share and Woori Bank was able to purchase more shares than they would be in accordance with their ownership percentage. This purchase resulted in the increase of its ownership percentage.

(*2) The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

(*3) The entity is a structured entity for the purpose of investment in securities and is in scope for consolidation, considering that the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

(*4) The entity is a money trust under the Financial Investment Services and Capital Markets Act and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

(*5) Due to liquidation of Woori Private Equity Asset Management Co., Ltd. during the year ended December 31, 2017 the entity was excluded from the scope for consolidation.

(*6) Due to liquidation during the year ended of December 31, 2017, the entity was excluded from the scope for consolidation.”

To determine whether the Group controls the structured entities, where the Group does not hold any ownership in them, the Group considered various factors in accordance with the Group’s accounting policy, which can be summarized as follows:

Involvement with the entity	The Group’s role within the entity	Structured Entities
The Group is involved with structured entities through the purchase of securities issued by the structured entities, such as senior, mezzanine, or subordinated bonds.	This is a case where the Group arranges the securitizations of its own or third parties’ assets and supports the transaction by purchasing the subordinated bond issued by the structured entity. As for the consolidated structured entities in this category, the Group is significantly exposed to the variable returns from the entities through the subordinated holdings more than other investors and the Group has the power over relevant activities that significantly affect the variable return—such as the Group has the right to determine to wind down the entity, as a major investor, in case of default.	•  KAMCO Value Recreation First Securitisation Specialty CO., Ltd.
The Group is involved with structured entities through the provision of credit facilities to the entities, such as through financial guarantee and purchase agreement of asset-backed commercial papers (‘ABCP’).	This is a case where the Group supports the securitization transactions through provision of liquidity facilities or other credit enhancements, such as financial guarantees. The Group also sponsors a number of asset-backed commercial paper (ABCP) conduits by arranging the acquisition of loans. As for the consolidated structured entities in this category, the Group is significantly exposed to the variable returns from the entities through the financial guarantees or purchase	•  Kumho Trust First Co., Ltd and 14 structured entities

F-11

Involvement with the entity	The Group’s role within the entity	Structured Entities
	agreement provided more than other investors and the Group has the power over relevant activities that significantly effects the variable return—such as the Group has the right to determine to dispose the securitized assets of the entity, through the contracts, in case of default.
The Group is involved with a structured entity by originating loans directly to the entity.	This is a case where the Group invests in a structured entity, such as origination of loans. As for the consolidated structured entities in this category, the Group is significantly exposed to the variable returns from the entities through the loan originated and the Group has the power over relevant activities that significantly effects the variable return—such as the Group makes significant investment decisions.	•  Consus Eighth Co., LLC.
The Group manages funds on behalf of the customers through the operation of trusts accounts.	This is a case where the Group is designated as a trustee by the customers (or investors) of the trusts to manage operations, investments, and financing, and they do not participate in such decision making process. As for the consolidated structured entities in this category, the Group is exposed to expected loss from the trusts, through its provision of guarantee on the original principal or both of principal and interests.	•  Principal guaranteed trusts •  Principal and interest guaranteed trusts

(3) As of December 31, 2016 and 2017, despite having more than a 50% ownership interests, the Group has not consolidated the following companies as the Group do not have the ability to control following subsidiaries:

	As of December 31, 2016
Entities	Location	Main business	Percentage of ownership (%)
Golden Bridge NHN Online Private Equity Investment(*1)	Korea	Securities Investment		60.0
Mirae Asset Maps Clean Water Private Equity Investment Trust 7th(*1)	Korea	Securities Investment		59.7
Kiwoom Yonsei Private Equity Investment Trust(*1)	Korea	Securities Investment		88.9
Kiwoom Frontier Professional Investment Private Fund 6 (Bond)(*2)	Korea	Securities Investment		50.0

F-12

	As of December 31, 2017
Subsidiaries	Location	Main Business	Percentage of ownership (%)
Golden Bridge NHN Online Private Equity Investment(*1)	Korea	Securities Investment		60.0
Mirae Asset Maps Clean Water Private Equity Investment Trust 7th(*1)	Korea	Securities Investment		59.7
Kiwoom Yonsei Private Equity Investment Trust(*1)	Korea	Securities Investment		88.9
Hana Walmart Real Estate Investment Trust 41-1(*1)	Korea	Securities Investment		90.1
IGIS Global Private Placement Real Estate Fund No. 148-1(*1)	Korea	Securities Investment		75.0
IGIS Global Private Placement Real Estate Fund No. 148-2(*1)	Korea	Securities Investment		75.0

(*1) The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.

(*2) Due to redemption of the fund during 2017, the fund was excluded from the list as of December 31, 2017 above.

(4) The summarized financial information before the elimination of intercompany transactions of the subsidiaries whose financial information were prepared under IFRS for the Group’s consolidated financial statements is as follows (Unit: Korean Won in millions):

	As of and for the year ended December 31, 2016
	Assets		Liabilities		Operating revenue		Net income (loss) attributable to owners			Comprehensive income (loss) attributable to owners
Woori FIS Co., Ltd.		141,329		105,821		244,783		1,048			1,432
Woori Private Equity Asset Management Co., Ltd.		97,338		53,244		2,154		312			219
Woori Finance Research Institute Co., Ltd.		3,710		334		4,445		108			100
Woori Card Co., Ltd.		7,606,108		6,180,893		1,555,373		109,393			116,381
Woori Investment Bank Co., Ltd.		1,576,627		1,404,566		178,572		23,872			23,897
Woori Credit Information		31,292		4,416		27,884		543			618
Woori America Bank		2,186,049		1,973,263		73,909		15,266			20,899
Woori Global Markets Asia Limited		272,008		147,581		7,255		1,863			5,582
Woori Bank (China) Limited		4,984,017		4,466,812		475,174		32,025			11,505
AO Woori Bank		239,860		188,474		16,221		5,650			15,553
PT Bank Woori Saudara Indonesia 1906 Tbk		2,089,822		1,693,111		179,014		24,573			48,542
Banco Woori Bank do Brasil S.A.		241,229		206,043		17,059		2,786			9,600
Korea BTL Infrastructure Fund		784,770		299		33,476		29,617			29,617
Woori Fund Service Co., Ltd.		11,386		1,372		7,787		1,011			1,011
Woori Finance Cambodia PLC.		32,405		24,751		4,545		1,250			1,494
Woori Finance Myanmar Co., Ltd.		4,305		2,651		380		(613	)		(569	)
Wealth Development Bank		209,779		174,446		12,519		1,248			1,876
Woori Bank Vietnam Limited		159,223		278		—		(346	)		3,545
Money trust under the FISCM Act(*)		1,525,145		1,495,815		55,540		697			697
Structured entity for the securitization of financial assets		487,431		895,824		29,480		6,912			7,138
Structured entity for the investments in securities		4,397,163		1,898,977		137,896		56,605			61,535

F-13

	As of and for the year ended December 31, 2017
	Assets		Liabilities		Operating revenue		Net income (loss) attributable to owners			Comprehensive income (loss) attributable to owners
Woori FIS Co., Ltd.		103,932		71,386		252,460		1,940			(2,963	)
Woori Private Equity Asset Management Co., Ltd.		42,894		2,670		7,257		(4,114	)		(4,074	)
Woori Finance Research Institute Co., Ltd.		3,790		350		4,733		83			64
Woori Card Co., Ltd.		8,605,993		6,973,705		1,771,157		101,214			107,321
Woori Investment Bank Co., Ltd.		1,880,157		1,588,610		183,376		20,023			20,210
Woori Credit Information Co., Ltd.		33,298		6,175		31,580		861			752
Woori America Bank		1,954,301		1,679,248		81,337		11,869			(16,833	)
Woori Global Markets Asia Limited		290,226		178,343		11,345		1,922			(12,544	)
Woori Bank (China) Limited		4,960,637		4,458,683		388,913		13,809			(15,252	)
AO Woori Bank		201,704		149,101		15,656		4,748			1,217
PT Bank Woori Saudara Indonesia 1906 Tbk		2,230,617		1,745,171		192,485		38,488			(18,689	)
Banco Woori Bank do Brasil S.A.		213,889		181,544		20,455		1,843			(2,840	)
Korea BTL Infrastructure Fund		786,480		301		30,240		26,390			26,390
Woori Fund Service Co., Ltd.		12,653		1,242		9,021		1,398			1,398
Woori Finance Cambodia PLC.		51,304		32,873		5,895		983			(473	)
Woori Finance Myanmar Co., Ltd.		18,236		5,307		2,506		791			15
Wealth Development Bank		191,049		156,808		13,632		1,323			(1,093	)
Woori Bank Vietnam Limited		775,758		632,160		29,698		2,436			(15,347	)
Money trust under the FISCM Act(*)		1,560,672		1,530,760		44,344		582			582
Structured entity for the securitization of financial assets		867,583		1,275,719		22,730		1,179			(2,800	)
Structured entity for the investments in securities		34,939		76		377		(475	)		(38,592	)

(*) FISCM Act: Financial Investment Services and Capital Markets Act

(5) Structured entities

The Group is involved with structured entities, mainly through securitization of financial assets, investment fund, and money trust.

• Structured entity for the securitization of financial assets

The structured entity is established for the purpose of securitization of project financing loans, corporate bonds, and other financial assets. The Group is involved with the structured entity through providing with credit facility over asset-backed commercial papers issued by the entity, originating loans directly to the structured entity, or purchasing 100% of the subordinated debts issued by the structured entity.

• Structured entity for the investments in securities

The structured entity is established for the purpose of investments in securities. The Group acquires beneficiary certificates through its contribution of fund to the structured entity, and it is exposed to the risk that it may not be able to recover its fund depending on the result of investment performance of asset managers of the structured entity.

F-14

• Money trust under the Financial Investment Services and Capital Markets Act

The Group provides with financial guarantee of principal and interest or principal only to some of its trust products. Due to the financial guarantees, the Group may be obliged to supplement when the principal and interest or principal of the trust product sold is short of the guaranteed amount depending on the result of investment performance of the trust product.

Structured entities are assessed for consolidation in accordance with the accounting policy set out in Note 2. (2), and also refer to Note 1. (2).

Consolidated structured entities

• Securitizations

The Group uses structured entities to securitize loan and receivables, corporate bonds, and other financial assets that it has originated or acquired in order to diversify its source of funding for asset origination and capital efficiency purposes. In turn, the structured entities issue asset backed securities collateralized by the transferred financial assets. In these securitizations, various classes of debt securities are issued to the Group and third parties, and the structured entities have mainly issued subordinated notes to the Group, an assets transferor. The subordinated notes are designed to absorb potentially could be significant to the structured entities. These structured entities are generally consolidated when the Group has the power to direct the relevant activities of the entities and exposed to or have rights to variable returns from the entities. In addition, the Group involves with structured entities which are established by third parties mainly for securitization through provision of liquidity facilities including financial guarantees, which are designed to provide credit support to the entities, or investing in securities issued by structured entities or providing financing to structured entities through loans.

• Investment funds

The Group has established a number of money market and non-money market funds where it is deemed to be acting as principal rather than agent its role as investment manager, the Group controls and hence consolidate these funds. Also the Group is deemed to control a number of third-party managed funds through its involvement as a principal in the funds.

• Money trusts under the Trust Business Act

The Group has consolidated its guaranteed money trusts due to its provision of financial guarantee for investors over principal and interest or principal only. Thus, the Group may be obliged to supplement when the principal or interest of the money trusts is short of the guaranteed amount.

Unconsolidated structured entities

The Group has entered into various agreements with structured entities such as asset securitization vehicles, and structured finance and investment funds. Where it is determined in accordance with IFRS 10 that the Group has no controlling power over such structured entities, the entities are not consolidated. The nature of interests, which the Group retains, and the risks, to which the Group is exposed, of the unconsolidated structured entities are as follows:

Asset securitization vehicle issues asset-backed securities and redeems the principal and interest or distributes dividends on asset-backed securities with profits from collecting cash flows or sale of securitized assets. The Group, as a secondary guarantor, provides purchase commitments for its asset-backed securities or guarantees to such asset securitization vehicle and recognizes commission income or interest income related to the commitment or guarantees. Therefore, the Group would be exposed to risks to purchases or pays back asset-backed securities issued by the vehicles when a primary guarantor fails to provide the financing asset securitization vehicles.

F-15

Structured finance includes investments in project financing on real estates, social overhead capital (“SOC”), infrastructure and shipping finance. They are formed as special purpose entity by funding through equity investments and loans from various investors. Investment decisions are made by the Group based on business outlook of such projects. In relation to such investments, the Group recognizes interest income on loans, gains or losses on valuation of equity investments or dividend income. The structured finance is secured by additional funding agreement, guarantee or credit facilities. However, the structured financing project would fail to return the capital of equity investments or principal of loans to the Group if it is discontinued or did not achieve business outcome.

Investment funds include trusts and private equity funds. A trust is formed by contributions from various investors, operated by a manager engaged to the trust and distributed proceeds from sales of investments to the investors. A private equity fund is established in order to acquire ownership interests in a portfolio company with exit strategy after implementing financial and operational restructuring of the company. The Group recognizes unrealized gains or losses on change in value of investments in proposition of ownership interests in investments. The Group would be exposed to risks of loss when the value of portfolio investment is decreased.

Total assets of the unconsolidated structured entities, the carrying value of the related items recorded, the maximum exposure to risks, and the loss recognized in conjunction with the unconsolidated structured entities as of December 31, 2016 and 2017 are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Asset securitization vehicle		Structured finance		Investment Funds
Total asset of the unconsolidated structured entities		8,426,713		61,324,862		9,131,362
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities		3,361,910		2,790,215		1,749,494
Loans and receivables		65,470		2,414,044		—
Financial assets held for trading		—		254,150		—
Available-for-sale financial assets		1,216,446		115,843		1,664,865
Held-to-maturity financial assets		2,079,648		—		—
Investments in joint ventures and associates		—		—		84,629
Derivative assets		346		6,178		—
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities		1,363		1,224		—
Derivative liabilities		201		362		—
Other liabilities (including provisions)		1,162		862		—
The maximum exposure to risks		4,263,993		3,802,210		1,749,494
Investments		3,361,910		2,790,215		1,749,494
Purchase agreements		28,000		—		—
Credit facilities		834,083		970,195		—
Other commitments		40,000		41,800		—
Loss recognized on unconsolidated structured entities		6,353		71,185		683

F-16

	December 31, 2017
	Asset securitization vehicle		Structured finance		Investment Funds
Total asset of the unconsolidated structured entities		7,295,601		40,172,830		13,641,135
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities		3,215,159		2,314,043		1,138,523
Loans and receivables		43,180		1,969,760		—
Financial assets held for trading		—		233,428		10,160
Available-for-sale financial assets		902,390		106,819		904,774
Held-to-maturity financial assets		2,269,451		—		—
Investments in joint ventures and associates		—		—		223,589
Derivative assets		138		4,036		—
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities		1,433		1,506		—
Derivative liabilities		575		968		—
Other liabilities (including provisions)		858		538		—
The maximum exposure to risks		4,032,531		2,918,448		1,138,523
Investments		3,215,159		2,314,043		1,138,523
Credit facilities		817,372		604,405		—
Loss recognized on unconsolidated structured entities		837		3,939		5,993

(6) The details of the limitations with regard to the transfer of assets or the redemption of liabilities within the Group are provided below.

Some subsidiaries are regulated by the rules of the jurisdictions, in which they were incorporated, with regard to funding or management of deposits. Also, there is the limitation that they must have pre-approval from their regulators in case of remittance of earnings to the Group.

(7) Subsidiaries of which non-controlling interests are significant to the Group’s consolidated financial statements are as follows (Unit: Korean Won in millions):

1) Accumulated non-controlling interests at the end of the period

	December 31, 2016		December 31, 2017
Woori Investment Bank		73,986		119,111
PT Bank Woori Saudara Indonesia 1906 Tbk		70,249		64,877
Wealth Development Bank		16,983		16,778

2) Net income attributable to non-controlling interests

	For the year ended December 31, 2015		For the year ended December 31, 2016		For the year ended December 31, 2017
Woori Investment Bank		4,353		9,990		8,370
PT Bank Woori Saudara Indonesia 1906 Tbk		6,241		6,383		8,882
Wealth Development Bank		—		611		648

3) Dividends to non-controlling interests

	For the year ended December 31, 2015		For the year ended December 31, 2016		For the year ended December 31, 2017
PT Bank Woori Saudara Indonesia 1906 Tbk		778		1,242		1,513

F-17

2. SIGNIFICANT BASIS OF PREPARATION AND ACCOUNTING POLICIES

(1) Basis of presentation

The Group’s consolidated financial statements are prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).

The Group operates primarily in Korea and its official accounting records are maintained in Korean Won. The United States dollar (“U.S. dollar” or “US$” or “USD”) amounts are provided herein as supplementary information solely for the convenience of readers outside Korea. Korean Won amounts are expressed in U.S. Dollars at the rate of 1,067.42 Korean Won to US$1.00, the noon buying exchange rate in effect on December 31, 2017, as quoted by the Federal Reserve Bank of New York in the United States. Such convenience translation into U.S. Dollars should not be construed as representations that Korean Won amounts have been, could have been, or could in the future be, converted at this or any other rate of exchange.

The significant accounting policies that have been applied for the preparation of the consolidated financial statements for the year ended December 31, 2017 are described below. There have not been changes to the significant accounting policies except for the impacts from the adoptions of accounting standards or interpretations which are explained below.

The Group’s consolidated financial statements have been prepared based on the historical cost method except for specific non-current assets and certain financial assets or liabilities reported at fair value. Historical cost is generally based on the fair value of the consideration given in exchange for goods and services.

The consolidated financial statements of the Group were approved by the board of directors on March 2, 2018.

1) The Group has newly adopted the following new standards and interpretations that affected the Group’s accounting policies.

Amendments to IAS 7—Statement of Cash Flows

The amendments require an entity to provide disclosures that enable users of financial statements to evaluate changes in liabilities arising from financing activities, including both cash and non-cash changes. Additional disclosure required related to the first time application of these amendments in the current year are in note 6. Consistent with the transition provisions of the amendments, the Group has not disclosed comparative information for the prior period. Apart from the additional disclosure in note 6, the application of these amendments has no material impact on the disclosures or the amounts recognized in the Group’s consolidated financial statements.

Amendments to IAS 12—Income Taxes

The amendments clarify that in evaluating the deferred tax assets arising from deductible temporary difference of debt instruments measured at fair value, the carrying amount of an asset does not limit the estimation of probable future taxable profits. The application of these amendments has no material impact on the disclosures or the amounts recognized in the Group’s consolidated financial statements.

Other than the amendment stated above, there are several annual improvements in the current period, but the application of the amendments has had no material effect on the Group’s consolidated financial statements.

2) The Group has not applied the following IFRSs that have been issued but are not yet effective:

Enactments to IFRS 9—Financial Instruments

IFRS 9 issued in November 2009 introduced new requirements for the classification and measurement of financial assets. IFRS 9 was subsequently amended in October 2010 to include requirements for the classification

F-18

and measurement of financial liabilities and for derecognition, and in November 2013 to include the new requirements for general hedge accounting. Another revised version of IFRS 9 was issued in July 2014 mainly to include a) impairment requirements for financial assets and b) limited amendments to the classification and measurement requirements by introducing a ‘fair value through other comprehensive income’(FVTOCI) measurement category for certain simple debt instruments. This standards supersedes IAS 39—Financial Instruments: Recognition and Measurement, and will be applied for annual periods beginning on or after January 1, 2018.

In principle, IFRS 9 must be applied retrospectively. However, there are certain exemptions to the application of retroactive approach such as presenting comparative information on classification, measurement and impairment of financial instruments. In addition, IFRS 9 is applied prospectively for hedge accounting with exceptions such as accounting for the time value of options. The Group will apply the standard retrospectively, in accordance with IAS 8 “Accounting Policies, Changes in Accounting Estimates and Errors”, but will not restate previous periods provided that it is not possible to do so without the use of hindsight. Because of this, the Group will recognise any difference between the previous carrying amount and the carrying amount at the beginning of the annual reporting period that includes the date of initial application of IFRS 9 (January 1, 2018) in the opening retained earnings as of January 1, 2018.

The Group has completed the design and implementation of the internal controls and/or financial reporting processes related to the presentation of financial instruments in order to adopt IFRS 9. The Group has completed a financial impact analysis on the 2017 financial statements based on available information as of year-end in order to determine the impact of adopting IFRS 9 for the first time. The expected financial impact of each key issue on the financial statement, is as follows.

a) Classification and Measurement of Financial Instruments

When IFRS 9 is adopted, all recognized financial assets that in scope are subsequently measured at either amortized cost, fair value through other comprehensive income (FVTOCI), or fair value through profit or loss (FVTPL) as shown below, based on the business model for managing financial assets and based on the nature of contractual cash flows arising from the financial assets. Also, when hybrid contracts contain financial asset as its host contract, the embedded derivative will not be bifurcated as the whole hybrid contract would be classified as a financial asset.

	Business Model
Nature of the contractual cash flow	Collection of the contractual cashflow	Collection of the contractual cashflow and sale of asset	Sale of asset, others
Principal and Interest only	Amortized Cost(*1)	FVTOCI(*1)	FVTPL
Other than the above		FVTPL(*2)

(*1) An irrevocable election is available to designate a financial asset to be classified as FVTPL, for the purpose of eliminating or reducing accounting discrepancies.

(*2) For equity securities held for purposes other than short-term trading, an irrevocable election is available to designate them as FVTOCI financial assets.

As the requirements to classify a financial asset as either amortized cost or FVTOCI are more stringent in IFRS 9 than in IAS 39, the variability of net income may increase as the amount of FVTPL financial assets is increased due to the adoption of IFRS 9.

As of year-end the Group currently holds loans and receivables amounting to 267,106,204 million Won, held-to-maturity financial assets amounting to 16,749,296 million Won. This amount includes 51,653 million Won of hybrid contracts in which the host contract, after separating the embedded derivatives, is a debt security. In addition, The group also holds available-for-sale financial assets amounting to 15,352,950 million Won, and FVTPL financial assets (except derivatives) amounting to 2,727,302 million Won as of year end in accordance with IAS 39.

F-19

According to IFRS 9, a financial asset may be measured at amortized cost only when its cashflows are solely principal and interest on specified dates on the contract and when the purpose of holding such asset is only to receive the contractual cashflows.

The estimated impact on the classification and measurement of Group’s financial assets (except derivatives) as of year-end is presented as follows. The following information is constructed from the accounting system for financial instruments built for the purpose of adopting IFRS 9.

(Unit : Korean Won in millions)

Classification per IAS 39	Classification per IFRS 9	Carrying Amount per IAS 39		Carrying Amount per IFRS 9
Loans and receivables (Deposits)	Amortized cost		8,870,835		8,870,835
Financial assets at FVTPL (Deposits)	FVTPL		25,972		25,972
Financial assets at FVTPL (Debt securities)	FVTPL		2,654,027		2,654,027
AFS financial assets (Debt securities)	FVTPL		46,855		46,855
AFS financial assets (Debt securities)	FVTOCI		12,874,209		12,874,209
AFS financial assets (Debt securities)	Amortized cost		308,181		322,300
Held-to-maturity financial assets (Debt securities)	Amortized cost		16,749,296		16,749,296
Financial assets at FVTPL (Equity securities)	FVTPL		47,304		47,304
AFS financial assets (Equity securities)	FVTPL		1,273,498		1,274,716
AFS financial assets (Equity securities)	FVTOCI		850,207		850,207
Loans and receivables (Loans)	FVTPL		279,032		280,001
Loans and receivables (Loans)	Amortized cost		253,014,491		253,014,491
Loans and receivables (Other financial assets)	Amortized cost		6,772,088		6,772,088
Total financial assets except derivatives			303,765,995		303,782,301

Among the financial assets measured at amortized cost, loans and receivables and held-to-maturity financial assets amounting to 279,032 million Won and AFS financial assets amounting to 1,320,353 million Won would be reclassified to FVTPL financial assets as a result of adopting IFRS 9.

b) Classification and Measurement of Financial Liabilities

According to the IFRS 9, the amount of changes in the fair value of financial liabilities measured at FVTPL due to changes in credit risk is presented as part of other comprehensive income, and such amount is not recycled subsequently in profit or loss. However, when recognizing the fair value changes in other comprehensive income causes or magnifies accounting discrepancies, the amount is recognized in profit or loss instead.

As of year-end the Group holds financial liabilities amounting to 294,809,262 million Won, and out of this amount 251,796 million Won has been designated as FVTPL financial liabilities. In relation to these financial liabilities, the increase in fair value amounting to 31,275 million Won has been recognized as losses for the year ended 2017 in accordance with IAS 39.

The results of the analysis conducted to determine the financial impact of applying IFRS 9 on FVTPL financial liabilities as of year-end show that the cumulative changes in fair value of FVTPL financial liabilities as a result of changes in credit risk amounted to 133 million Won.

c) Impairment: Financial assets and Contract assets

IFRS 9 requires the recognition of allowance for expected credit losses for debt instruments, lease receivables, contract assets, loan commitments and financial guarantee contracts measured at either amortized cost or FVTOCI.

F-20

The allowance to be recognized under IFRS 9 is the amount of expected 12-month credit loss or the expected lifetime credit loss, according to the 3 stages of credit risk deterioration since initial recognition as shown below.

	Stage 1	Stage 2	Stage 3
	Credit risk has not significantly increased since initial recognition(*)	Credit risk has significantly increased since initial recognition	Credit has been impaired
Allowance for expected credit losses	Expected 12-month credit losses: Expected credit losses due to possible defaults on financial instruments within 12-month period from the year-end.	Expected lifetime credit losses: Expected credit losses from all possible defaults during the expected lifetime of the financial instruments.

(*) Credit risk may be considered to not have been significantly increased when credit risk is low at the reporting date. The Group considers that a financial asset’s credit risk is low when its credit risk rating is equivalent to the generally understood definition of “investment grade”.

Meanwhile, for purchased or originated credit impaired assets, the allowance for expected credit losses per IFRS 9 is the amount of cumulative changes in the expected lifetime credit losses after its initial recognition.

Determining a significant increase in credit risk since initial recognition

The Group assess when a significant increase in credit risk has occurred based on quantitative and qualitative assessments. For the financial assets subject to the impairment provision of IFRS 9, it is considered to have a significant increase in credit risk and are moved to stage 2 when the following indicator exists:

• Credit rating decrease by more than the agreed threshold relative to the credit rating at initial recognition

• Accounts that is classified as precautious level defined by Financial Supervisory Service

• Borrower has financial difficulties or has early warning signal as defined by the Group

• Backstop criteria—accounts that are 30 calendar days or more past due.

Forward-looking information

Credit losses are the expected cash shortfalls from what is contractually due over the expected life of the financial instrument, discounted at the original effective interest rate. Expected credit losses (ECL) are the unbiased probability-weighted credit losses determined by evaluating a range of possible outcomes and considering future economic conditions. The Group incorporated forward-looking information by using statistical analysis on various macroeconomic variables. The Group has integrated such results in modelling probability of default (PD)

Modeling techniques

ECL are calculated by multiplying three main components, being the PD, loss given default and the exposure at default, discounted at the original effective interest rate. ECL is measured at the individual financial instrument level, however a collective approach where financial instruments with similar risk characteristics are grouped together, with apportionment to individual financial instruments, is used where effects can only be seen at collective level.

For the IFRS 9 impairment assessment, the Group developed models are used to determine the probability of default, loss given default and exposure at default. For stage 2 and 3, the Group applies lifetime PDs but uses 12 month PDs for stage 1. The ECL drivers of PD, exposure at default and loss given default are modelled at an account level which considers historical data available by the Group.

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As of year-end the Group holds loans and receivables amounting to 267,106,204 million Won in accordance with IAS 39. In relation to this amount, the Group has recognized allowance for credit losses amounting to 1,830,242 million Won.

The expected impact on the allowance for credit losses as of year-end using the Group’s system for allowances is as follows.

(Unit : Korean Won in millions)

	Allowance for credit losses per IAS 39 (A)		Allowance for credit losses per IFRS 9 (B)		Increases(B-A)
Deposits		2,458		3,092		634
Debt securities		—		9,331		9,331
AFS debt securities		—		4,253		4,253
Held-to-maturity debt securities		—		5,078		5,078
Loan receivables and other financial assets		1,827,785		2,075,752		247,967
Guarantees		183,247		192,376		9,129
Loan commitments		66,115		104,887		38,772
Total		2,079,605		2,385,438		305,833

d) Hedge accounting

The requirements for hedge accounting in IFRS 9 has become more lenient as compared to IAS 39. That is, more financial instruments may now be considered to be a hedged item and/or a hedging instrument, the quantitative basis for evaluating high hedge effectiveness (80~125%) has been abolished, and the retroactive assessment requirement has also been abolished. These allow the firms to concentrate on hedging activities.

There are no significant impacts to the Group’s financial statements related to hedge accounting as a result of adopting IFRS 9.

e) Effect on regulatory capital ratios

Based on the analysis on IFRS 9, there are no significant impacts to the regulatory capital ratios.

Enactments to IFRS 15—Revenue from Contracts with Customers

The core principle under IFRS 15 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendments introduces a 5-step approach to revenue recognition and measurement: 1) Identify the contract with a customer, 2) Identify the performance obligations in the contract, 3) Determine the transaction price, 4) Allocate the transaction price to the performance obligations in the contract, 5) Recognize revenue when (or as) the entity satisfies a performance obligation. This standard will supersede IAS 11—Construction Contracts, IAS 18- Revenue, IFRIC 13—Customer Loyalty Programmes, IFRIC 15—Agreements for the Construction of Real Estate, IFRIC 18—Transfers of Assets from Customers, and SIC 31—Revenue-Barter Transactions Involving Advertising Services. The enactment is effective for annual periods beginning on or after 1 January 2018. The Group does not expect the enactments to have a significant impact on the consolidated financial statements.

Enactments to IFRS 16—Leases

IFRS 16 introduces a comprehensive model for the identification of lease arrangements and accountings treatments for both lessors and lessees. IFRS 16 will supersede the current lease guidance including IAS 17 Leases and the related interpretations. The enactments are effective for annual periods beginning on or after 1 January 2019.

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IFRS 16 distinguishes leases and service contracts on the basis of whether an identified asset is controlled by a customer. Distinctions of operating leases and finance leases are removed for lessee accounting and is replaced by model where a right-of-use asset and corresponding liability have to be recognized for all leases by lessees except for short-term leases and leases of low value assets.

The right-of-use asset is initially measured at cost and subsequently measured at cost (subject to certain exceptions) less accumulated depreciation and impairment losses, adjusted for any remeasurement of the lease liability. The lease liability is initially measured at the present value of the lease payments that are not paid at that date. Subsequently, the lease liability is adjusted for interest and lease payments, as well as the impact of lease modifications, amongst others. Furthermore, the classification of cash flows will also be affected as operating lease payments under IAS 17 are presented as operating cash flows; whereas under the IFRS 16 model, the lease payments will be split into a principal and an interest portion which will be presented as financing and operating cash flows respectively.

In contrast to lessee accounting, IFRS 16 substantially carries forward the lessor accounting requirements in IAS 17, and continues to require a lessor to classify a lease either as an operating lease or a finance lease. Furthermore, extensive disclosures are required by IFRS 16.

In contrast, 1) for finance leases where the Group is a lessee and 2) in cases where the Group is a lessor, the Group do not anticipate that the application of IFRS 16 will have a significant impact on the amounts recognized in the Group’s consolidated financial statements.

Amendments to IFRS 2—Share-based Payment

The amendments include: 1) when measuring the fair value of share-based payment, the effects of vesting and non-vesting conditions on the measurement of cash-settled share-based payment should be consistent with the measurement of equity-settled share-based payment, 2) Share-based payment transaction in which the Group settles the share-based payment arrangement net by withholding a specified portion of the equity instruments per statutory tax withholding requirements would be classified as equity-settled in its entirety, if otherwise would be classified as equity-settled without the net settlement feature, and 3) when a cash-settled share-based payment changes to an equity-settled share-based payment because of modifications of the terms and conditions, the original liability recognized is derecognized and the equity-settled share-based payment is recognized at the modification date fair value. Any difference between the carrying amount of the liability at the modification date and the amount recognized in equity at the same date would be recognized in profit and loss immediately. The amendments are effective for annual periods beginning on or after January 1, 2018. The Group does not expect the amendments to have a significant impact on the consolidated financial statements.

Amendments to IAS 40—Transfers of Investment Property

The amendments clarify that a transfer to, or from, investment property necessitates an assessment of whether a property meets, or has ceased to meet, the definition of investment property, supported by observable evidence that a change in use has occurred. The amendments further clarify that situations other than the ones listed in IAS 40 may evidence a change in use, and that a change in use is possible for properties under construction (i.e. a change in use is not limited to completed properties).

The amendments are effective for annual periods beginning on or after January 1, 2018 with earlier application permitted. Entities can apply the amendments either retrospectively (if this is possible without the use of hindsight) or prospectively. The Group does not expect the amendments to have a significant impact on the consolidated financial statements.

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Enactments to IFRIC 22—Foreign Currency Transactions and Advance Consideration

The interpretation addresses how to determine the ‘date of transaction’ for the purpose of determining the exchange rate to use on initial recognition of an asset, expense or income, when consideration for that item has been paid or received in advance in a foreign currency which resulted in the recognition of a non-monetary asset or non-monetary liability (e.g. a non-refundable deposit or deferred revenue).

The interpretation specifies that the date of transaction is the date on which the entity initially recognizes the non-monetary asset on non-monetary liability arising from the payment or receipt of advance consideration. If there are multiple payments or receipts in advance, the interpretation requires an entity to determine the date of transaction for each payment or receipt of advance consideration. The Group does not expect the enactments to have a significant impact on the consolidated financial statements.

The interpretation is effective for annual periods beginning on or after January 1, 2018 with earlier application permitted. Entities can apply the interpretation either retrospectively or prospectively. Specific transition provisions apply to prospective application.

(2) Basis of consolidated financial statement presentation

The consolidated financial statements incorporate the financial statements of the Bank and its subsidiaries (including structured entities) controlled by the Bank (the “Group”). The Group determines that the Group controls an investee if the Group has all the following: 1) power over the investee, 2) exposure, or rights, to variable returns from its involvement with the investee, 3) the ability to use its power over the investee to affect the amount of the investor’s returns. The Group reassesses whether or not it controls an investee if facts and circumstances indicate that there are changes to one or more of the three elements of control listed above.

When the Group has less than a majority of the voting rights of an investee, it still has the power over the investee if the voting rights are sufficient to give it the practical ability to direct the relevant activities of the investee unilaterally.

The Group considers all relevant facts and circumstances in assessing whether or not the Group’s voting rights in an investee are sufficient to give it power, including:

• The size of the Group’s holding of voting rights relative to the size and dispersion of holdings of the other vote holders;

• Potential voting rights held by the Group, other vote holders or other parties;

• Rights arising from other contractual arrangements; or

• Any additional facts and circumstances that indicate that the Group has, or does not have, the current ability to direct the relevant activities at the time that decisions need to be made, including voting patterns at previous shareholders’ meetings.

Income and expenses of subsidiaries acquired or disposed of during the year are included in the consolidated statements of comprehensive income from the effective date of acquisition or up to the effective date of disposal, respectively, as appropriate. The carrying amount of non-controlling interests is adjusted to reflect their proportional share of changes in equity subsequent to the initial recognition. Total comprehensive income of subsidiaries is attributed to the owners of the Group and the non-controlling interests even if this result in the non-controlling interests has a deficit balance.

When necessary, adjustments are made to the financial statements of subsidiaries to bring their accounting policies in line with those adopted by the Group.

All intra-group transactions, related assets and liabilities, income and expenses are eliminated in full on consolidation.

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Changes in the Group’s ownership interests in subsidiaries, without a loss of control, are accounted for as equity transactions. The carrying amounts of the owners’ interests and the non-controlling interests are adjusted to reflect the changes in their relative interests in the subsidiaries. Any difference between the adjusted non-controlling interests and the fair value of the consideration paid or received is recognized directly in equity and attributed to owners of the Group.

When the Group loses control of a subsidiary, the profit or loss on disposal is calculated as the difference between (i) the aggregate of the fair value of the consideration received and the fair value of any retained interest and (ii) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling interests. When the assets of the subsidiary are carried at revalued amounts or fair values and the related cumulative gain or loss has been recognized in other comprehensive income and accumulated in equity, the amounts previously recognized in other comprehensive income and accumulated in equity are accounted for as if the Group had directly disposed of the relevant assets (i.e. reclassified to net income or transferred directly to retained earnings). The fair value of any investment retained in the former subsidiary at the date when control is lost is recognized as the fair value on initial recognition for subsequent accounting under IAS 39 Financial Instruments: Recognition and Measurement or, when applicable, the cost on initial recognition of an investment in an associate or a joint venture.

(3) Business combinations

Acquisitions of subsidiaries and businesses are accounted for using the acquisition method. The consideration transferred in a business combination is measured at fair value, which is calculated as the sum of the acquisition-date fair values of the assets transferred by the Group, liabilities assumed by the Group to the former owners of the acquiree and the equity interests issued by the Group in exchange for control of the acquiree. Acquisition-related costs are generally recognized in net income as incurred.

At the acquisition date, the acquiree’s identifiable assets, liabilities and contingent liabilities that meet the condition for recognition under IFRS 3 are recognized at their fair value, except that:

• deferred tax assets or liabilities and assets or liabilities related to employee benefit arrangements are recognized and measured in accordance with IAS 12 Income Taxes and IAS 19 Employee Benefits, respectively;

• liabilities or equity instruments related to share-based payment arrangements of the acquiree or share-based payment arrangements of the Group entered into to replace share-based payment arrangements of the acquiree are measured in accordance with IFRS 2 Share-based Payment at the acquisition date; and

• non-current assets (or disposal groups) that are classified as held for sale in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations are measured at the lower of their previous carrying amounts and fair value less costs to sell.

Any excess of the sum of the consideration transferred, the amount of any non-controlling interest in the acquiree and the fair value of the Group’s previously held equity interest (if any) in the acquiree over the net of identifiable assets and liabilities assumed of the acquiree at the acquisition date is recognized as goodwill which is included in intangible assets.

If, after reassessment, the Group’s interest in the fair value of the acquiree’s identifiable net assets exceeds the sum of the consideration transferred, the amount of any non-controlling interest in the acquiree and the fair value of the acquirer’s previously held equity interest in the acquiree (if any), the excess is recognized immediately in net income as a bargain purchase gain.

Non-controlling interests that are present ownership interests and entitle their holders to a proportionate share of the entity’s net assets in the event of liquidation may be initially measured either at fair value or at the

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non-controlling interests’ proportionate share of the recognized amounts of the acquiree’s identifiable net assets. The choice of measurement basis is made on a transaction-by-transaction basis. Other types of non-controlling interests are measured at fair value or, when applicable, on the basis specified in another IFRSs.

When the consideration transferred by the Group in a business combination includes assets or liabilities resulting from a contingent consideration arrangement, the contingent consideration is measured at its acquisition-date fair value and included as part of the consideration transferred in a business combination. Changes in the fair value of the contingent consideration that qualify as measurement period adjustments are adjusted retrospectively, with corresponding adjustments against goodwill. Measurement period adjustments are adjustments that arise from additional information obtained during the ‘measurement period’ (which cannot exceed one year from the acquisition date) about facts and circumstances that existed at the acquisition date.

The subsequent accounting for changes in the fair value of the contingent consideration that do not qualify as measurement period adjustments depends on how the contingent consideration is classified. Contingent consideration that is classified as equity is not remeasured at subsequent reporting dates and its subsequent settlement is accounted for within equity. Contingent consideration that is classified as an asset or a liability is remeasured at subsequent reporting dates in accordance with IAS 39 Financial Instruments: Recognition and Measurement, or IAS 37 Provisions, Contingent Liabilities and Contingent Assets, as appropriate, with the corresponding gain or loss being recognized in profit or loss.

When a business combination is achieved in stages, the Group’s previously held equity interest in the acquiree is remeasured at fair value at the acquisition date (i.e. the date when the Group obtains control) and the resulting gain or loss, if any, is recognized in net income. Amounts arising from changes in value of interests in the acquiree prior to the acquisition date that have previously been recognized in other comprehensive income are reclassified to net income where such treatment would be appropriate if that interest were disposed of.

In case where i) a common entity ultimately controls over all participating entities, or businesses, in business combination transaction, prior to and after the transaction continuously, and ii) the control is not temporary, the transaction meets the definition of “business combination under common control” and it is deemed that the transaction only results in the changes in legal substance, not economic substance, from the perspective of the ultimate controlling party. Thus, in such transactions, the acquirer recognizes the assets and liabilities of the acquiree on its financial statements at the book values as recognized in the ultimate controlling party’s consolidated financial statements, and the difference between the book value of consideration transferred to and the book value of net assets transferred in is recognized as equity.

(4) Investments in joint ventures and associates

An associate is an entity over which the Group has significant influence. Significant influence is the power to participate in making decision on the financial and operating policy of the investee but is not control or joint control over those policies.

A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement have rights to net assets relating to the arrangement. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control.

The net income of current period and the financial results of the joint ventures and associates are incorporated in these consolidated financial statements using the equity method of accounting, except when the investment is classified as held for sale, in which case it is accounted for in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations. Under the equity method, an investment in the joint ventures and associates is initially recognized in the consolidated statements of financial position at cost and adjusted thereafter to recognize the Group’s share of the net assets of the joint ventures and associates and any

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impairment. When the Group’s share of losses of the joint ventures and associates exceeds the Group’s interest in the associate (including any long term interests that, in substance, form part of the entity’s net investment in the associate or joint venture), the Group discontinues recognizing its share of further losses. Additional losses are recognized only to the extent that the Group has incurred legal or constructive obligations or made payments on behalf of the joint ventures and associates.

Any excess of the cost of acquisition over the Group’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities of the joint ventures and associates recognized at the date of acquisition is recognized as goodwill, which is included within the carrying amount of the investment. Any excess of the Group’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities over the cost of acquisition is recognized immediately in net income.

Upon a loss of significant influence over the joint ventures and associates, the Group discontinues the use of the equity method and measures at fair value of any investment that the Group retains in the former joint ventures and associates from the date when the Group loses significant influence. The fair value of the investment is regarded as its fair value on initial recognition as a financial asset in accordance with IAS 39 Financial Instruments; Recognition and Measurement. The Group recognized differences between the carrying amount and fair value in net income and it is included in determination of the gain or loss on disposal of joint ventures and associates. The Group accounts for all amounts recognized in other comprehensive income in relation to that joint ventures and associates on the same basis as would be required if the joint ventures and associates had directly disposed of the related assets or liabilities. Therefore, if a gain or loss previously recognized in other comprehensive income by an associate would be reclassified to net income on the disposal of the related assets or liabilities, the Group reclassifies the gain or loss from equity to net income as a reclassification adjustment.

When the Group’s ownership of interest in an associate or a joint venture decreases but the Group continues to maintain significant influence over an associate or a joint venture, the Group reclassifies to profit or loss the proportion of the gain or loss that had previously been recognized in other comprehensive income relating to that decrease in ownership interest if the gain or loss would be reclassified to profit or loss on the disposal of the related assets or liabilities. Meanwhile, if interest on associate or joint venture meets the definition of non-current asset held for sale, it is accounted for in accordance with IFRS 5.

The requirements of IAS 39 Financial Instruments: Recognition and Measurement to determine whether there has been a loss event are applied to identify whether it is necessary to recognize any impairment loss with respect to the Group’s investment in the joint ventures and associates. When necessary, the entire carrying amount of the investment (including goodwill) is tested for impairment in accordance with IAS 36 Impairment of Assets as a single asset by comparing its recoverable amount (higher of value in use and fair value less costs to sell) with its carrying amount. Any impairment loss recognized is not allocated to any asset (including goodwill), which forms part of the carrying amount of the investment. Any reversal of that impairment loss is recognized in accordance with IAS 36 to the extent that the recoverable amount of the investment subsequently increases.

The Group continues to use the equity method when an investment in an associate becomes an investment in a joint venture or an investment in a joint venture becomes an investment in an associate. There is no remeasurement to fair value upon such changes in ownership interests.

When a subsidiary transacts with an associate or a joint venture of the Group, profits and losses resulting from the transactions with the associate or joint venture are recognized in the Group’s consolidated financial statements only to the extent of interests in the associate or joint venture that are not related to the Group.

(5) Investment in joint operation

A joint operation is a joint arrangement whereby the parties that have joint control of the arrangement have rights to the assets, and obligations for the liabilities, relating to the arrangement. Joint control is the

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contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control.

When the Group operates as a joint operator, it recognizes in relation to its interest in a joint operation:

(a) its assets, including its share of any assets held jointly;

(b) its liabilities, including its share of any liabilities incurred jointly;

(c) its revenue from the sale of its share of the output arising from the joint operation;

(d) its share of the revenue from the sale of the output by the joint operation; and

(e) its expenses, including its share of any expenses incurred jointly.

The Group accounts for the assets, liabilities, revenues and expenses relating to its interest in a joint operation in accordance with the IFRSs applicable to the particular assets, liabilities, revenues and expenses.

When the Group enters into a transaction with a joint operation in which it is a joint operator, such as a sale or contribution of assets, it is conducting the transaction with the other parties to the joint operation and, as such, the Group recognizes gains and losses resulting from such a transaction only to the extent of the other parties’ interests in the joint operation.

When the Group enters into a transaction with a joint operation in which it is a joint operator, such as a purchase of assets, it does not recognize its share of the gains and losses until it resells those assets to a third party.

(6) Revenue recognition

1) Interest income

Interest income is recognized when earned. Interest income on financial assets that are classified as loans and receivables, available-for-sale or held-to-maturity is determined using the effective interest method.

The effective interest method is a method of calculating the amortized cost of a financial asset (or group of financial assets) and of allocating the interest income over the expected life of the asset. The effective interest rate is the rate that exactly discounts estimated future cash flows to the instrument’s initial carrying amount. Calculation of the effective interest rate takes into account fees payable or receivable that is an integral part of the instrument’s yield, premiums or discounts on acquisition or issue, early redemption fees and transaction costs. All contractual terms of a financial instrument are considered when estimating future cash flows.

2) Loan origination fees and costs

The commission fees earned on loans, which is part of the effective interest rate of loans, is accounted for as deferred origination fees. Incremental cost related to the acquisition or disposal is accounted for deferred origination costs, and it is amortized on the effective interest method and included in interest revenues on loans.

3) Fees and commissions income

Commitment and utilization fees are determined as a percentage of the outstanding facility. If it is unlikely that a specific lending arrangement will be entered into, such fees are taken to net income over the life of the facility, otherwise, they are deferred and included in the effective interest rate on the advance.

Fees in respect of services are recognized as the right to consideration accrues through the provision of the service to the customer. The arrangements are generally contractual and the cost of providing the service is incurred as the service is rendered. The price is usually fixed and determinable.

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Credit card fees include commission received from merchants for processing credit card transaction and annual fees received from credit card holders. Revenue from the commission is accrued to net income when the service is performed and annual fee is deferred and recognized as income over the period of the service provided.

4) Trust fees and compensation related to trust accounts

The Group receives fees for its management of unconsolidated trust assets, which are recognized on an accrual basis when the management services are provided and earned. The Group also is entitled to receive performance-based fees for certain trust accounts. These performance-based fees are recognized at the end of the performance period. In addition, a certain trust account which the Group guarantees to repay the principals and minimum interests of the trust account to its beneficiaries shall be included in the consolidated financial statements. The Group recognizes incomes when earned and expenses when interests to be paid to beneficiaries are accrued.

(7) Accounting for foreign currencies

The Group’s consolidated financial statements are presented in Korean Won, which is the functional currency of the Bank. At the end of each reporting period, monetary assets and liabilities denominated in foreign currencies are translated to the functional currency at its prevailing exchange rates at the date. Foreign exchange differences on monetary items that qualify as hedging instruments in a cash flow hedge or that form part of net investment in foreign operations are recognized in equity.

A monetary available-for-sale (“AFS”) financial asset is treated as if it were carried at amortized cost in the foreign currency. Accordingly, for such financial assets, exchange differences resulting from retranslating amortized cost are recognized in net income.

Non-monetary items denominated in foreign currencies that are stated at fair value are translated into Korean Won at foreign exchange rates at the dates the values were determined. Translation differences arising on non-monetary items measured at fair value are recognized in net income except for differences arising on non-monetary AFS financial assets, for example equity shares, which are included in the AFS reserve in equity unless the asset is the hedged item in a fair value hedge.

The Group identifies the most appropriate functional currency for each foreign operation based on the foreign operation’s activities. If Korean Won is not the foreign operation’s functional currency, its assets and liabilities, including goodwill and fair value adjustments arising on acquisition, are translated into Korean Won at foreign exchange rates at the end of each reporting date while the revenues and expenses are translated into Korean Won at average exchange rates for the period unless these do not approximate to the foreign exchange rates at the dates of the transactions. Foreign exchange differences arising on the translation of a foreign operation are recognized directly in equity and included in net income on its disposal.

(8) Cash and cash equivalents

Cash and cash equivalents consist of cash on hand, demand deposits, interest-earning deposits with original maturities of up to 90 days of acquisition date and highly liquid investment assets that are readily convertible to known amounts of cash and subject to an insignificant risk of changes in value.

(9) Financial assets and financial liabilities

1) Financial assets

A regular way purchase or sale is a purchase or sale of a financial asset under a contract whose term requires delivery of the asset within the time frame established generally by regulation or convention in the marketplace concerned.

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On initial recognition, financial assets are classified into held-for-trading, designated as at fair value through profit or loss (“FVTPL”), AFS financial assets, held-to-maturity (“HTM”) investments and loans and receivables. Regular way purchases of financial assets classified as loans and receivables are recognized on settlement date; all other regular way transactions in financial assets are recognized on trade date.

a) Held-for-trading:

A financial asset is classified as held-for-trading if it is acquired principally for sale in the near term, or forms part of a portfolio of financial instruments that are managed together and for which there is evidence of short-term profit taking, or it is a derivative (not in a qualifying hedge relationship). Held-for-trading financial assets are recognized at fair value with transaction costs being recognized in net income. Subsequently they are measured at fair value. Gains and losses on held-for-trading financial assets are recognized in net income as they arise.

b) Designated as at FVTPL:

Financial assets may be designated as at FVTPL only if such designation (a) eliminates or significantly reduces a measurement or recognition inconsistency; (b) applies to a group of financial assets, financial liabilities or both, which is managed and performance is evaluated on a fair value basis; or (c) is related to a contract containing one or more embedded derivative that would be required to be separated from the host contract.

Financial assets designated by the Group on initial recognition as at FVTPL are recognized at fair value, with transaction costs recognized in net income, and are subsequently measured at fair value. Gains and losses on financial assets that are designated as at FVTPL are recognized in net income as they arise.

c) AFS financial assets:

Financial assets that are not classified as HTM; held-for-trading; designated as at FVTPL; or loans and receivables, are classified as AFS. Financial assets can be designated as AFS on initial recognition. AFS financial assets are initially recognized at fair value plus directly related transaction costs. They are subsequently measured at fair value. Unquoted equity investments whose fair value cannot be measured reliably are carried at cost and classified as AFS financial assets. Impairment losses in monetary and non-monetary AFS financial assets and dividends on non-monetary financial assets are recognized in net income. Interest revenue on monetary financial assets is calculated using the effective interest method and recognized as a net income. Changes in the fair value of AFS financial assets other than those resulting from retranslation of monetary AFS at the reporting date, and any related tax are reported in a separate component of shareholders’ equity until disposal, and then the cumulative gain or loss is recognized in net income.

d) HTM investments:

A financial asset may be classified as a HTM investment only if it has fixed or determinable payments, a fixed maturity, and the Group has the positive intention and ability to hold the financial asset to maturity. HTM investments are initially recognized at fair value plus directly related transaction costs. They are subsequently measured at amortized cost using the effective interest method less any impairment losses.

e) Loans and receivables:

Non-derivative financial assets with fixed or determinable repayments that are not quoted in an active market are classified as loans and receivables, except those that are classified as AFS or as held-for-trading, or designated as at FVTPL. Loans and receivables are initially recognized at fair value plus directly related transaction costs. They are subsequently measured at amortized cost using the effective interest method less any impairment losses. Interest income is recognized using the effective interest method, except for the short-term receivables to which the present value discount is not meaningful.

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2) Financial liabilities

On initial recognition financial liabilities are classified into held-for-trading; designated as at FVTPL; or amortized cost. Issues of equity or financial liabilities measured at amortized cost are recognized on settlement date; all other regular way transactions in financial instruments are recognized on trade date.

a) Held-for-trading:

A financial liability is classified as held-for-trading if it is incurred principally for repurchase in the near term, or forms part of a portfolio of financial instruments that are managed together and for which there is an evidence of short-term profit taking, or it is a derivative (not in a qualifying hedge relationship). Held-for-trading financial liabilities are recognized at fair value with transaction costs being recognized in net income. Subsequently, they are measured at fair value. Gains and losses are recognized in net income as they arise.

b) Designated as at FVTPL:

Financial liabilities may be designated as at FVTPL only if such designation (a) eliminates or significantly reduces a measurement or recognition inconsistency; (b) applies to a group of financial liabilities or both that the Group manages and evaluates on a fair value basis; or (c) relates to an instrument that contains an embedded derivative which is not evidently closely related to the host contract. Financial liabilities that the Group designates on initial recognition as being at FVTPL are recognized at fair value, with transaction costs being recognized in net income, and are subsequently measured at fair value. Gains and losses on financial liabilities that are designated as at FVTPL are recognized in net income as they arise.

c) Amortized cost:

All other financial liabilities are measured at amortized cost using the effective interest method.

3) Reclassifications

Held-for-trading and AFS financial assets that meet the definition of loans and receivables (non-derivative financial assets with fixed or determinable payments that are not quoted in an active market) may be reclassified to loans and receivables if the Group has the intention and ability to hold the financial asset for the foreseeable future or until maturity. The Group typically regards the foreseeable future as twelve months from the date of reclassification. Reclassifications are made at fair value. This fair value becomes the asset’s new cost or amortized cost as appropriate. Gains and losses recognized up to the date of reclassification are not reversed.

4) Derecognition of financial assets and liabilities

The Group derecognizes a financial asset when the contractual right to the cash flows from the asset is expired, or when it transfers the financial asset and substantially all the risks and rewards of ownership of the asset to another company. If the Group neither transfers nor retains substantially all the risks and rewards of ownership and continues to control the transferred asset, the Group recognizes its retained interest in the asset and an associated liability for amounts it may have to pay. If the Group retains substantially all the risks and rewards of ownership of a transferred financial asset, the Group continues to recognize the financial asset and also recognizes a collateralized borrowing for the proceeds received.

On derecognition of a financial asset in its entirety, the difference between the asset’s carrying amount and the sum of the consideration received and receivable and the cumulated gain or loss that had been recognized in other comprehensive income and accumulated in equity is recognized in profit or loss.

On derecognition of a financial assets other than in its entirety (e.g. when the Group retains an option to repurchase part of a transferred asset, or it retains a residual interest and such an retained interest indicates that

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the transferor has neither transferred nor retained substantially all the risks and rewards of ownership and has retained control of the transferred asset), the Group allocates the previous carrying amount of the financial asset between the part it continues to recognize under continuing involvement, and the part it no longer recognizes on the basis of the relative fair value of those parts on the date of the transfer. The difference between the carrying amount allocated to the part that is no longer recognized and the sum of the consideration received for the part that is no longer recognized and any cumulative gain or loss allocated to it that had been recognized in other comprehensive income is recognized in profit or loss. A cumulative gain or loss that had been recognized in other comprehensive income is allocated between the part that continues to be recognized and the part that is no longer recognized on the basis of the relative fair value of those parts.

The Group derecognizes the financial liability, when Group’s obligations are discharged, cancelled or expired. The difference between paid cost and the carrying amount of financial liabilities is recorded in profit or loss.

5) Fair value of financial assets and liabilities

Financial instruments classified as held-for-trading or designated as at FVTPL and financial assets classified as AFS are recognized in the financial statements at fair value. All derivatives are measured at fair value.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in and orderly transaction between market participants at the measurement date. Fair values are determined from quoted prices in active markets for identical financial assets or financial liabilities where these are available. The Group characterizes active markets as those in which transactions for the asset or liability take place with sufficient frequency and volume to provide pricing information on an ongoing basis.

Where a financial instrument is not in active market characterized by low transaction volumes, price quotations which vary substantially among market participants, or in which minimal information is released publicly, fair values are established using valuation techniques relying on alternative market data or internally developed models using significant inputs that are generally readily observable from objective sources. Market data includes prices of financial instruments with similar maturities and characteristics, duration, interest rate yield curves, and measures of volatility. The amount determined to be fair value may incorporate the management of the Group’s own assumptions (including assumptions that the Group believes market participants would use in valuing the financial instruments and assumptions relating to appropriate risk adjustments for nonperformance and lack of marketability).

The valuation techniques used to estimate the fair value of the financial instruments include market approach and income approach, each of which involves a significant degree of judgment. Under the market approach, fair value is determined by reference to a recent transaction involving the financial instruments or by reference to observable valuation measures for comparable companies or assets.

Under the income approach, fair value is determined by converting future amounts (e.g., cash flows or earnings) to a single present amount (discounted) using current market expectations about the future amounts. In determining value under this approach, the Group makes assumptions regarding, among other things, revenues, operating income, depreciation and amortization, capital expenditures, income taxes, working capital needs, and terminal value of the financial investments. These valuation techniques involve a degree of estimation, the extent of which depends on the instrument’s complexity and the availability of market-based data.

The following are descriptions of valuation methodologies used by the Group to measure various financial instruments at fair value.

a) Financial assets at FVTPL and AFS financial assets:

The fair value of the securities included in financial assets at FVTPL and AFS financial assets are recognized in the consolidated statements of financial position based on available quoted market prices. For debt

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securities traded in the OTC market, the Group generally determines fair value based on prices obtained from independent pricing services. Specifically, with respect to independent pricing services, the Group obtains three prices per instrument from reputable independent pricing services in Korea, and generally uses the lowest of the prices obtained from such services without further adjustment. For non-marketable equity securities, the Group obtains prices from the independent pricing services. The Group validates prices received from such independent pricing services using a variety of means, including verification of the qualification of the independent pricing services, corroboration of the pricing by comparing the prices among the independent pricing services and by reference to other available market data, and review of the pricing model and assumptions used by the independent pricing services by the Group’s personnel who are familiar with market-related conditions.

b) Derivative assets and liabilities:

Quoted market prices are used for the Group’s exchange-traded derivatives, such as certain interest rate futures and option contracts. All of the Group’s derivatives that are traded in OTC markets where quoted market prices are not readily available are valued using internal valuation techniques. Valuation techniques and inputs to internally developed models depend on the type of derivative and nature of the underlying rate, price or index upon which the derivative’s value is based. If the model inputs for certain derivatives are not observable in a liquid market, significant judgments on the level of inputs used for valuation techniques are required.

c) Valuation Adjustments:

By using derivatives, the Group is exposed to credit risk if counterparties to the derivative contracts do not perform as expected. If counterparty fails to perform, counterparty credit risk is equal to the amount reported as a derivative asset in the consolidated statements of financial position. The amounts reported as a derivative asset are derivative contracts in a gain position. Few of the Group’s derivatives are listed on an exchange. The majority of derivative positions are valued using internally developed models that use as their basis observable market inputs. Therefore, an adjustment is necessary to reflect the credit quality of each counterparty to arrive at fair value. Counterparty credit risk adjustments are applied to derivative assets, such as OTC derivative instruments, when the market inputs used in valuation models may not be indicative of the creditworthiness of the counterparty. Adjustments are also made when valuing financial liabilities to reflect the Group’s own credit standing.

The adjustment is based on probability of default of a counterparty and loss given default. The adjustment also takes into account contractual factors designed to reduce the Group’s credit exposure to each counterparty. To the extent derivative assets (liabilities) are subject to master netting arrangements, the exposure used to calculate the credit risk adjustment is net of derivatives in a loss (gain) position with the same counterparty and cash collateral received (paid).

6) Impairment of the financial assets

The Group assesses at the end of each reporting date whether there is any objective evidence that a financial asset or group of financial assets classified as AFS, HTM or loans and receivables is impaired. A financial asset or portfolio of financial assets is impaired and an impairment loss incurs if there is an objective evidence of impairment as result of one or more events that occurred after the initial recognition of an asset and that event (or events) has an impact on the estimated future cash flows of the financial asset.

a) Financial assets carried at amortized cost:

If there is an objective evidence that an impairment loss on a financial asset or group of financial assets classified as HTM investments or as loans and receivables has been incurred, the Group measures the amount of the loss as the difference between the carrying amount of the asset or group of assets and the present value of estimated future cash flows from the asset or group of assets discounted at the effective interest rate of the instrument at initial recognition. For collateralized loans and receivables, estimated future cash flows include cash flows that may result from foreclosure less the costs of obtaining and selling the collateral.

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Impairment losses are assessed individually for financial assets that are individually significant and assessed either individually or collectively for assets that are not individually significant. In making collective assessment of impairment, financial assets are grouped into portfolios on the basis of similar risk characteristics. Future cash flows from these portfolios are estimated on the basis of the contractual cash flows and historical loss experience for assets with similar credit risk characteristics. Historical loss experience is adjusted, on the basis of observable data, to reflect current conditions not affecting the period of historical experience.

Impairment losses are recognized in net income and the carrying amount of the financial asset or group of financial assets is reduced by establishing a provision for impairment losses. If, in a subsequent period, the amount of the impairment loss reduces and the reduction can be ascribed to an event after the impairment was recognized, the previously recognized loss is reversed by adjusting the provision. Once an impairment loss has been recognized on a financial asset or group of financial assets, interest income is recognized on the carrying amount using the rate of interest at which estimated future cash flows were discounted in measuring impairment.

It is not the Group’s usual practice to write-off the asset at the time an impairment loss is recognized. Impaired loans and receivables are written off (i.e. the impairment provision is applied in writing down the loan’s carrying value in full) when the Group concludes that there is no longer any realistic prospect of recovery of part or the entire loan. Amounts recovered after a loan has been written off are reflected to the provision for the period in which they are received.

b) Financial assets carried at fair value:

When a decline in the fair value of a financial asset classified as AFS has been recognized directly in other comprehensive income and there is an objective evidence that the asset is impaired, the cumulative loss is removed from other comprehensive income and recognized in net income. The loss is measured as the difference between the amortized cost of the financial asset and its current fair value. Impairment losses on AFS equity instruments are not reversed through net income, but those on AFS debt instruments are reversed, if there is a decrease in the cumulative impairment loss that is objectively related to a subsequent event.

(10) Offsetting financial instruments

Financial assets and liabilities are presented in net in the consolidated statements of financial position when the Group has an enforceable legal right to set off and an intention to settle on a net basis or to realize an asset and settle the liability simultaneously.

(11) Investment properties

The Group classifies a property held to earn rentals and/or for capital appreciation as an investment property. Investment properties are measured initially at cost, including transaction costs, less subsequent depreciation and impairment.

Subsequent costs are included in the carrying amount of the asset or recognized as a separate asset if it is probable that future economic benefits associated with the assets will flow into the Group and the cost of an asset can be measured reliably. Routine maintenance and repairs are expensed as incurred.

While land is not depreciated, all other investment properties are depreciated based on the respective assets’ estimated useful lives using the straight-line method. The estimated useful lives, residual values and depreciation method are reviewed at the end of each reporting period, with the effect of any change in estimate accounted for on a prospective basis.

An investment property is derecognized from the consolidated financial statements on disposal or when it is permanently withdrawn from use and no future economic benefits are expected even from its disposal. The gain

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or loss on derecognition of an investment property is calculated as the difference between the net disposal proceeds and the carrying amount of the property and is recognized in profit or loss in the period of the derecognition.

(12) Premises and equipment

Premises and equipment are stated at cost less subsequent accumulated depreciation and accumulated impairment losses. The cost of an item of premises and equipment is directly attributable to their purchase or construction, which includes any costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management. It also includes the initial estimate of the costs of dismantling and removing the item and restoring the site on which it is located.

Subsequent costs to replace part of the premises and equipment are recognized in carrying amount of an asset or as an asset if it is probable that the future economic benefits associated with the assets will flow into the Group and the cost of an asset can be measured reliably. Routine maintenance and repairs are expensed as incurred.

While land is not depreciated, for all other premises and equipment, depreciation is charged to net income on a straight-line basis on the estimated economic useful lives as follows:

	Useful life
Buildings used for business purpose	35 to 57 years
Structures in leased office	4 to 5 years
Properties for business purpose	4 to 5 years
Leased assets	Useful lives of the same kind or similar other premises and equipment

The Group reassesses the depreciation method, the estimated useful lives and residual values of premises and equipment at the end of each reporting period. If expectations differ from previous estimates, the changes are accounted for as a change in an accounting estimate. When the carrying amount of a fixed asset exceeds the estimated recoverable amount, the carrying amount of such asset is reduced to the recoverable amount.

(13) Intangible assets and goodwill

Intangible assets are stated at the manufacturing cost or acquisition cost plus additional incidental expenses less accumulated amortization and accumulated impairment losses. The Group’s intangible assets are amortized on a straight-line basis on the estimated economic useful lives as follows. The estimated useful life and amortization method are reviewed at the end of each reporting period. If expectations differ from previous estimates, the changes are accounted for as a change in an accounting estimate.

	Useful life
Patents	10 years
Development costs	5 years
Software and others	4 to 5 years

In addition, when an indicator that intangible assets are impaired is noted, and the carrying amount of the asset exceeds the estimated recoverable amount of the asset, the carrying amount of the asset is reduced to its recoverable amount immediately.

Goodwill acquired in a business combination is included in intangible assets. Goodwill is not amortized but tested for impairment annually to the extent of reporting unit and when there is any indication of impairment.

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Goodwill acquired is allocated to each of the Group’s cash-generating units (“CGU”) expected to benefit from the synergies of the combination. A CGU to which goodwill has been allocated is tested for impairment annually, or more frequently when there is indication that the CGU may be impaired. If the recoverable amount of the CGU is less than its carrying amount, the impairment loss is allocated first to reduce the carrying amount of any goodwill allocated to the CGU and then to the other assets of the CGU on a pro-rata basis based on the carrying amount of each asset in the CGU. Any impairment loss for goodwill is recognized directly in net income in the consolidated statements of comprehensive income. An impairment loss recognized for goodwill is not reversed in subsequent periods.

(14) Impairment of non-monetary assets

Intangible assets with indefinite useful lives such as goodwill and membership, or intangible assets that are not yet available for use are tested for impairment annually, regardless of whether or not there is any indication of impairment. All other assets are tested for impairment when there is an objective indication that the carrying amount may not be recoverable, and if the indication exists. The Group estimates the recoverable amount. Recoverable amount is the higher of value in use and net fair value less costs to sell. If the recoverable amount of an asset is estimated to be less than its carrying amount, the carrying amount of the asset is reduced to its recoverable amount and such impairment loss is recognized immediately in net income.

(15) Leases

Leases are classified as finance leases whenever the terms of the lease transfer substantially all the risks and rewards of ownership to the lessee. All other leases are classified as operating leases.

1) As a lessor

Amounts due from lessees under finance leases are recognized as receivables at the amount of the Group’s net investment in the leases being the minimum lease payments and any unguaranteed residual value discount interest rate implicit in the lease. Finance lease income is allocated to accounting periods so as to reflect a constant periodic rate of return on the Group’s net investment outstanding in respect of the leases.

Rental income from operating leases is recognized on a straight-line basis over the term of the relevant lease. Initial direct costs incurred in negotiating and arranging an operating lease are added to the carrying amount of the leased asset and recognized on a straight-line basis over the lease term. Operating lease assets are included within other assets and depreciated over their useful lives.

2) As a lessee

Assets held under finance leases are initially recognized as assets of the Group at their fair value at the inception of the lease or, if lower, at the present value of the minimum lease payments. The corresponding liability to the lessor is included in the consolidated statements of financial position as a finance lease obligation. Lease payments are apportioned between finance expenses and reduction of the lease obligation so as to achieve a constant rate of interest on the remaining balance of the liability. Contingent rentals arising under finance leases are recognized as expenses in the periods in which they are incurred.

Operating lease payments are recognized as an expense on a straight-line basis over the lease term, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased asset are consumed. Contingent rentals arising under operating leases are recognized as expenses in the period in which they are incurred.

(16) Derivative instruments

Derivative instruments are classified as forward, futures, option, and swap, depending on the types of transactions and are classified as either trading or hedging depending on the purpose. Derivatives are initially

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recognized at fair value at the date the derivative contract is entered into and are subsequently measured to their fair value at the end of each reporting period. The resulting gain or loss is recognized in net income immediately unless the derivative is designated and effective as a hedging instrument.

A derivative embedded in a contract is accounted for as a stand-alone derivative if its economic characteristics are not closely related to the economic characteristics of the host contract; unless the entire contract is measured at fair value with changes in fair value recognized in net income.

The Group designates certain hedging instruments to (a) hedge of the exposure to changes in fair value of a recognized asset or liability or an unrecognized firm commitment (fair value hedge); (b) hedge of the exposure to variability in cash flows that is attributable to a particular risk associated with a recognized asset or liability or a highly probable forecasted transaction (cash flow hedge); and (c) hedge of a net investment in a foreign operation.

At the inception of the hedge relationship, the Group documents the relationship between the hedging instrument and the hedged item, along with its risk management objectives and its strategy for undertaking various hedge transactions. Furthermore, at the inception of the hedge and on an ongoing basis, the Group documents whether the hedging instrument is highly effective in offsetting changes in fair values or cash flows of the hedged item.

1) Fair value hedge

Changes in the fair value of derivatives that are designated and qualified as fair value hedges are recognized in net income immediately, together with any changes in the fair value of the hedged asset or liability that are attributable to the hedged risk. Hedge accounting is discontinued when the Group revokes the hedging relationship or when the hedging instrument is no longer qualified for hedge accounting. If the hedging instrument no longer meets the criteria for hedge accounting, the fair value adjustment to the carrying amount of the hedged item is amortized to net income from that date to maturity using the effective interest method.

2) Cash flow hedge

The effective portion of changes in the fair value of derivatives that are designated and qualified as cash flow hedges is recognized in other comprehensive income. The gain or loss relating to the ineffective portion is recognized immediately in net income. Amounts previously recognized in other comprehensive income and accumulated in equity are reclassified to net income when the hedged item is recognized in net income.

Hedge accounting is discontinued when the hedging instrument is expired or sold, or it is no longer qualified for hedge accounting, and any cumulative gain or loss in other comprehensive income remains in equity until the forecast transaction is ultimately recognized in net income. When a forecasted transaction is no longer expected to occur, the gain or loss accumulated in equity is recognized immediately in net income.

3) Net investment hedge

Hedges of net investments in foreign operations are accounted for similarly to cash flow hedges. The effective portion of changes in the fair value of the hedging instrument is recognized in equity while the ineffective portion is recognized immediately in net income. The cumulated gain and loss in other comprehensive income is reclassified from equity to profit or loss on the disposal or partial disposal of the foreign operations.

(17) Assets (or Disposal group) held for sale

The Group classifies a non-current asset (or disposal group) as held for sale if its carrying amount will be recovered principally through a sale transaction rather than through continuing use. For this, the non-current asset

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(or disposal group) must be available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such assets (or disposal groups) and its sale must be highly probable. For the sale to be highly probable, the appropriate level of management must be committed to a plan to sell the asset (or disposal group), and an active programme to locate a buyer and complete the plan must have been initiated. In addition, the sale should be expected to qualify for recognition as a completed sale within one year from the date of classification.

When the Group is committed to a sale plan involving loss of control of a subsidiary, all of the assets and liabilities of that subsidiary are classified as held for sale when the criteria described above are met, regardless of whether the Group will retain a non-controlling interest in its former subsidiary after the sale.

When the Group is committed to a sale plan involving disposal of an investment, or a portion of an investment, in an associate or joint venture, the investment or the portion of the investment that will be disposed of is classified as held for sale when the criteria described above are met, and the Group discontinues the use of the equity method in relation to the portion that is classified a held for sale. Any retained portion of an investment in an associate or a joint venture that has not been classified as held for sale continues to be accounted for using the equity method. The Group discontinues the use of the equity method at the time of disposal when the disposal results in the Group losing significant influence over the associate or joint venture.

After the disposal takes place, the Group accounts for any retained interest in the associate or joint venture in accordance with IAS 39 Financial Instruments: Recognition and Measurement unless the retained interest continues to be an associate or a joint venture, in which case the Group uses the equity method.

Non-current assets (and disposal groups) classified as held for sale are measured at the lower of their previous carrying amount and fair value less costs to sell.

(18) Provisions

The Group recognizes provision if it has a present or contractual obligations as a result of the past event, it is probable that an outflow of resources will be required to settle the obligation, and the amount of the obligation is reliably estimated. Provision is not recognized for the future operating losses.

The Group recognizes provision related to the unused portion of point rewards earned by credit card customers, payment guarantees, loan commitment and litigations. Where the Group is required to restore a leased property that is used as a branch, to an agreed condition after the contractual term expires, the present value of expected amounts to be used to dispose, decommission or repair the facilities is recognized as an asset retirement obligation.

Where there are a number of similar obligations, the probability that an outflow will be required in settlement is determined by considering the obligations as a whole. Although the likelihood of outflow for any one item may be small, if it is probable that some outflow of resources will be needed to settle the obligations as a whole, a provision is recognized.

(19) Capital and compound financial instruments

The Group classifies a financial instrument that it issues as a financial liability or an equity instrument in accordance with the substance of the contractual arrangement. An instrument is classified as a liability if it is a contractual obligation to deliver cash or another financial asset, or to exchange financial assets or financial liabilities on potentially unfavourable terms. An instrument is classified as equity if it evidences a residual interest in the assets of the Group after the deduction of liabilities. The components of a compound financial instrument issued by the Group are classified and accounted for separately as financial liabilities or equity as appropriate.

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If the Group reacquires its own equity instruments, those instruments (“treasury shares”) are presented as a deduction from total equity. The gain or loss on the purchase, sale, issue, or cancellation of treasury shares is not recognized in net income but recognized directly in equity.

(20) Financial guarantee contracts

Under a financial guarantee contract, the Group, in return for a fee, undertakes to meet a customer’s obligations under the terms of a debt instrument if the customer fails to do so.

A financial guarantee is recognized as a liability; initially at fair value and will be amortized, if not designated as at FVTPL, subsequently at the higher of its initial value less cumulative amortization and any provision under the contract measured in accordance with provision policy. Amortization is calculated so as to recognize fees receivable in profit or loss over the period of the guarantee.

(21) Employee benefits and pensions

The Group recognizes the undiscounted amount of short-term employee benefits expecting payment in exchange for the services, when employee renders services. Also, the Group recognizes expenses and liabilities in the case of accumulating compensated absences, when the employees render service that increases their entitlement to future compensated absences. Though the Group may have no legal obligation to pay a bonus, considering some cases, the Group has a practice of paying bonuses. In such cases, the Group has a constructive obligation, and thus recognizes expenses and liabilities when the employees render service.

The Group is operating defined contribution retirement pension plans and defined benefit retirement pension plans. Contributions to defined contribution retirement pension plans are recognized as an expense when employees have rendered service entitling them to the contributions. For defined benefit retirement pension plans, the cost of providing benefits is determined using the Projected Unit Credit Method, with actuarial valuations being carried out at the end of each reporting period. Remeasurement, comprising actuarial gains and losses, the effect of the changes to the asset ceiling (if applicable) and the return on plan assets (excluding interest), is reflected immediately in the statement of financial position with a charge or credit recognized in other comprehensive income in the period in which they occur.

Remeasurement recognized in other comprehensive income is reflected immediately in retained earnings and will not be reclassified to profit or loss. Past service cost is recognized in profit or loss in the period of a plan amendment. Net interest is calculated by applying the discount rate at the beginning of the period to the net defined benefit liability or asset. Defined benefit costs are composed of service cost (including current service cost, past service cost, as well as gains and losses on curtailments and settlements), net interest expense (income), and remeasurement.

The Group presents the service cost and net interest expense (income) components in profit or loss, and the remeasurement component in other comprehensive income. Curtailment gains and losses are accounted for as past service costs.

The retirement benefit obligation recognized in the consolidated statement of financial position represents the actual deficit or surplus in the Group’s defined benefit plans. Any surplus resulting from this calculation is limited to the present value of any economic benefits available in the form of refunds from the plans or reductions in future contributions to the plans.

Liabilities for termination benefits are recognized at the earlier of either 1) when the Group has become not able to cancel its proposal for termination benefits, or 2) when the Group has recognized the cost of restructuring that accompanies the payment of termination benefits.

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(22) Income taxes

Income tax expense represents the sum of the tax currently payable and deferred tax. Current income tax expense approximates taxes to be paid or refunded for the current period and deferred income tax expense is provided on an asset and liability method whereby deferred tax assets are recognized for deductible temporary differences, including operating losses and tax credit carryforwards, and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the carrying values of assets and liabilities for financial reporting purposes and their tax bases. Deferred income tax benefit or expense is then recognized for the change in deferred tax assets or liabilities between periods. Deferred tax assets and liabilities are measured at the tax rates on the date of enactment or substantive enactment that are expected to apply in the period in which the liability is settled or the asset realized. Deferred tax assets, including the carryforwards of unused tax losses, are recognized to the extent it is probable that the deferred tax assets will be realized.

Deferred income tax assets and liabilities are offset if, and only if the Group has a legally enforceable right to offset current tax assets against current tax liabilities, and the deferred tax assets and liabilities relate to income taxes levied by the same taxation authority on either the taxable entity or different taxable entities which intend either to settle current tax liabilities and assets on a net basis.

The carrying amount of deferred tax assets is reviewed at the end of each reporting period and reduced to the extent that it is no longer probable that sufficient taxable profits will be available to allow all or part of the asset to be recovered.

Deferred liabilities are not recognized if the temporary difference arises from goodwill. Deferred tax assets or liabilities are not recognized if they arise from the initial recognition (other than in a business combination) of other assets and liabilities in a transaction that affects neither the taxable profit nor the accounting profit.

Current and deferred tax are recognized in profit or loss, except when they relate to items that are recognized in other comprehensive income or directly in equity, in which case, the current and deferred tax are also recognized in other comprehensive income or directly in equity respectively.

(23) Earnings per share (“EPS”)

Basic EPS is calculated by earnings subtracting the dividends paid to holders of preferred stock and hybrid securities from the net income attributable to ordinary shareholders from the statements of comprehensive income and dividing by the weighted average number of common shares outstanding. Diluted EPS is calculated by adjusting the earnings and number of shares for the effects of all dilutive potential common shares.

3. SIGNIFICANT ACCOUNTING ESTIMATES AND ASSUMPTIONS

The significant accounting estimates and assumptions are continually evaluated and are based on historical experiences and various factors including expectations of future events that are considered to be reasonable. Actual results can differ from those estimates based on such definitions.

The significant judgments which management has made about the application of the Group’s accounting policies and key sources of uncertainty in estimate do not differ from those used in preparing the consolidated financial statements for the year ended December 31, 2016.

(1) Income taxes

The Group is subject to income taxes in numerous jurisdictions, which requires significant judgment in determining realization of deferred tax. Actual tax payment may be different from the provision estimate and such difference may affect the income tax expense. There are various transactions and calculations for which the

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ultimate tax determination is uncertain. Deferred tax assets relating to tax losses carried forward and deductible temporary differences are recognized, only to the extent that it is probable that future taxable profit will be available against which the tax losses carried forward and the deductible temporary differences can be utilized. This assessment requires significant management estimates and judgments. Future taxable profit is estimated based on, among other relevant factors, forecasted operating results, which are based on historical financial performance. In the event the Group was to determine that it would be able to realize its deferred income tax assets in the future at an amount different than their net recorded amount, the Group would make an adjustment to the provision for income taxes at such time.

(2) Valuation of financial instruments

Financial instruments classified as held-for trading or designated as at FVTPL and financial instruments classified as AFS are recognized in the financial statements at fair value. All derivatives are measured at fair value. Financial instruments, which are not traded in active market will have less objective fair value and require broad judgment in liquidity, concentration, uncertainty in market factors and assumption in price determination and other risks. The fair value of those assets is established by using valuation techniques.

As described in the significant accounting policies in Note 2-(9)-5), ‘ Fair value of financial assets and liabilities’, a range of valuation techniques, which include market approach and income approach and internally developed models that incorporate various types of assumptions and variables, are used to determine the fair value of financial instruments.

(3) Impairment of loan and receivables

Impairment loss for loan and receivables carried at amortized cost is measured as the difference between such assets’ carrying value and the present value of estimated recoverable cash flows (excluding any future loss events that have not occurred) discounted by using the initial effective interest rate. In the event that the estimated cash flow of the financial asset is affected by one or more loss events occurred after initial recognition, it is determined that the financial asset is impaired.

The objective evidences that a financial asset is impaired incorporate below loss events:

1) Financial assets that are individually significant

• Delinquent loans

• Debt in restructuring

• Probable state of debtor’s bankruptcy or liquidation

• Occurrence of significant reduction in the value of securities

• Breach of limit or debt covenant

• Deterioration of operating performance

2) Financial assets that are not individually significant

• Repayment status of debtor or observable macro-economic indexes

The Group first assesses whether objective evidence of impairment exists individually for financial assets that are individually significant (individual evaluation of impairment), and individually or collectively for financial assets that are not individually significant. If the Group determines that no objective evidence of impairment exists for an individually assessed financial asset, it includes the asset in a group of financial assets with similar credit risk characteristics and collectively assesses them for impairment (collective evaluation of impairment).

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There are two components to the Group’s loan impairment provisions (individual and collective).

Individual assessment of impairment losses are calculated by discounting the expected future cash flows of a loan at its original effective interest rate and comparing the resultant present value with the loan’s carrying amount. This process normally encompasses management’s best estimate, such as operating cash flow of debtor and net realizable value of any collateral held and the timing of anticipated receipts.

Collective assessment of impairment losses are established on a portfolio basis using the methodology based on historical loss experience. The methodology based on historical loss experience is used to estimate inherent incurred loss on groups of assets for collective evaluation of impairment. Such methodology incorporates factors such as type of product and debtors, credit rating, portfolio size, loss emergence period and recovery period and applies probability of default on each assets (or pool of assets) and loss given default by type of collateral. Also, consistent assumptions are applied to form a formula-based model in estimating inherent loss and to determine factors on the basis of historical loss experience and current condition. The methodology and assumptions used for estimating future cash flows are reviewed regularly to reduce any differences between loss estimates and actual loss experience.

(4) Defined benefit plan

The Group operates defined benefit retirement pension plans. Defined benefit retirement pension plans are measured through actuarial valuation and the Group estimates discount rate, future wage growth rate, mortality rates to produce actuarial valuation. Defined benefit retirement pension plans contain significant uncertainty in these estimates due to their long-term characteristic.

4. RISK MANAGEMENT

The Group’s operating activity is exposed to various financial risks. The Group is required to analyse and assess the level of complex risks, and determine the permissible level of risks and manage such risks. The Group’s risk management procedures have been established to improve the quality of assets for holding or investment purposes by making decisions as how to avoid or mitigate risks through the identification of the source of the potential risks and their impact.

The Group has established an approach to manage the acceptable level of risks and reduce the excessive risks in financial instruments in order to maximize the profit given risks present, for which the Group has implemented processes for risk identification, assessment, control, and monitoring and reporting.

The risk is managed by the risk management department in accordance with the Group’s risk management policy. The Risk Management Committee makes decisions on the risk strategies such as the avoidance of concentration on capital at risk and the establishment of acceptable level of risk.

(1) Credit risk

Credit risk represents the possibility of financial losses incurred when the counterparty fails to fulfill its contractual obligations. The goals of credit risk management are to maintain the Group’s credit risk exposure to a permissible degree and to optimize its rate of return considering such credit risk.

1) Credit risk management

The Group considers the probability of failure in performing the obligation of its counterparties, credit exposure to the counterparty, the related default risk and the rate of default loss. The Group uses the credit rating model to assess the possibility of counterparty’s default risk; and when assessing the obligor’s credit grade, the Group utilizes credit grades derived using statistical methods.

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In order to manage credit risk limit, the Group establishes the appropriate credit line per obligor, company or industry. It monitors obligor’s credit line, total exposures and loan portfolios when approving the loan.

The Group mitigates credit risk resulting from the obligor’s credit condition by using financial and physical collateral, guarantees, netting agreements and credit derivatives. The Group has adopted the entrapment method to mitigate its credit risk. Credit risk mitigation is reflected in qualifying financial collateral, trade receivables, guarantees, residential and commercial real estate and other collaterals. The Group regularly performs a revaluation of collateral reflecting such credit risk mitigation.

2) Maximum exposure to credit risk

The Group’s maximum exposure to credit risk refers to net book value of financial assets net of allowances, which shows the uncertainties of maximum changes of net value of financial assets attributable to a particular risk without considering collateral and other credit enhancements obtained. However, the maximum exposure is the fair value amount (recorded on the books) for derivatives, maximum contractual obligation for payment guarantees and loan commitment for loan contracts.

The maximum exposure to credit risk is as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Loans and receivables:
Korean treasury and government agencies		16,058,305		8,823,584
Banks		20,242,260		26,845,309
Corporates		88,985,566		90,570,551
Consumers		133,106,502		140,866,760
Sub-total		258,392,633		267,106,204
Financial assets at fair value through profit or loss (“FVTPL”):
Deposits indexed to gold prices		26,180		25,972
Debt securities held for trading		2,644,916		2,644,333
Designated at FVTPL		4,348		9,694
Derivative assets for trading		2,898,295		3,115,775
Sub-total		5,573,739		5,795,774
Available-for-sale (“AFS”) debt securities		16,541,888		13,229,244
Held-to-maturity (“HTM”) securities		13,910,251		16,749,296
Derivative assets for hedging		140,577		59,272
Off-balance sheet items:
Guarantees		14,761,784		12,859,715
Loan commitments		83,795,496		80,760,325
Sub-total		98,557,280		93,620,040
Total		393,116,368		396,559,830

F-43

a) Credit risk exposure by geographical areas

The following tables analyze credit risk exposure by geographical areas (Unit: Korean Won in millions):

	December 31, 2016
	Korea		China		USA		UK		Japan		Others(*)		Total
Loans and receivables		241,380,250		4,286,018		2,792,088		895,874		323,470		8,714,933		258,392,633
Financial assets at FVTPL		5,205,849		6,525		—		261,547		81		99,737		5,573,739
AFS debt securities		16,155,290		13,845		137,861		—		—		234,892		16,541,888
HTM securities		13,758,863		—		20,336		—		—		131,052		13,910,251
Derivative assets for hedging		74,166		—		—		66,342		—		69		140,577
Off-balance sheet items		96,245,092		737,513		103,130		80,831		23,250		1,367,464		98,557,280
Total		372,819,510		5,043,901		3,053,415		1,304,594		346,801		10,548,147		393,116,368

	December 31, 2017
	Korea		China		USA		UK		Japan		Others(*)		Total
Loans and receivables		250,678,479		4,104,912		2,823,247		1,094,988		381,890		8,022,688		267,106,204
Financial assets at FVTPL		5,551,870		2,937		—		148,955		—		92,012		5,795,774
AFS debt securities		12,407,602		52,259		151,131		—		—		618,252		13,229,244
HTM securities		16,606,692		—		63,732		—		—		78,872		16,749,296
Derivative assets for hedging		16,590		—		—		42,682		—		—		59,272
Off-balance sheet items		91,603,852		529,193		172,570		66,974		25,039		1,222,412		93,620,040
Total		376,865,085		4,689,301		3,210,680		1,353,599		406,929		10,034,236		396,559,830

(*) Others consist of financial assets in Indonesia, Vietnam, Panama and the European countries and others.

b) Credit risk exposure by industries

The following tables analyze credit risk exposure by industries, which are service, manufacturing, finance and insurance, construction, individuals and others in accordance with the Korea Standard Industrial Classification Code (Unit: Korean Won in millions):

	December 31, 2016
	Service		Manufacturing		Finance and insurance		Construction		Individuals		Others		Total
Loans and receivables		46,040,278		35,652,974		37,711,983		3,789,670		125,558,637		9,639,091		258,392,633
Financial assets at FVTPL		77,198		360,881		4,093,567		24,140		993		1,016,960		5,573,739
AFS debt securities		1,092,279		57,781		9,568,151		63,166		—		5,760,511		16,541,888
HTM securities		1,673,971		—		8,290,451		251,599		—		3,694,230		13,910,251
Derivative assets for hedging		—		—		140,577		—		—		—		140,577
Off-balance sheet items		18,423,611		26,878,320		9,927,574		4,621,971		33,603,651		5,102,153		98,557,280
Total		67,307,337		62,949,956		69,732,303		8,750,546		159,163,281		25,212,945		393,116,368

F-44

	December 31, 2017
	Service		Manufacturing		Finance and insurance		Construction		Individuals		Others		Total
Loans and receivables		47,192,641		34,502,509		38,260,051		3,574,746		133,094,287		10,481,970		267,106,204
Financial assets at FVTPL		100,766		83,239		4,640,068		15,073		1,040		955,588		5,795,774
AFS debt securities		707,737		37,719		7,331,774		153,534		—		4,998,480		13,229,244
HTM securities		1,348,754		—		10,962,149		296,214		—		4,142,179		16,749,296
Derivative assets for hedging		—		—		59,272		—		—		—		59,272
Off-balance sheet items		16,892,926		21,427,378		9,841,379		3,842,479		36,928,554		4,687,324		93,620,040
Total		66,242,824		56,050,845		71,094,693		7,882,046		170,023,881		25,265,541		396,559,830

3) Credit risk of loans and receivables

The credit exposure of loans and receivables by customer and loan classification are as follows (Unit: Korean Won in millions):

	December 31, 2016
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Loans and receivables neither overdue nor impaired		16,062,399		20,258,860		49,815,352		31,520,617		7,142,440		88,478,409		132,195,005		256,994,673
Loans and receivables overdue but not impaired		—		—		48,294		57,245		—		105,539		765,829		871,368
Impaired loans and receivables		—		—		1,404,568		429,955		208,372		2,042,895		510,793		2,553,688
Gross loans and receivables		16,062,399		20,258,860		51,268,214		32,007,817		7,350,812		90,626,843		133,471,627		260,419,729
Allowance for credit losses		4,094		16,600		1,156,000		424,142		61,135		1,641,277		365,125		2,027,096
Total, net		16,058,305		20,242,260		50,112,214		31,583,675		7,289,677		88,985,566		133,106,502		258,392,633

F-45

	December 31, 2017
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Loans and receivables neither overdue nor impaired		8,825,767		26,861,286		50,463,112		34,107,547		5,547,950		90,118,609		139,886,407		265,692,069
Loans and receivables overdue but not impaired		8		—		65,616		63,067		—		128,683		878,406		1,007,097
Impaired loans and receivables		—		—		1,402,131		251,431		46,717		1,700,279		537,001		2,237,280
Gross loans and receivables		8,825,775		26,861,286		51,930,859		34,422,045		5,594,667		91,947,571		141,301,814		268,936,446
Allowance for credit losses		2,191		15,977		1,078,733		267,162		31,125		1,377,020		435,054		1,830,242
Total, net		8,823,584		26,845,309		50,852,126		34,154,883		5,563,542		90,570,551		140,866,760		267,106,204

a) Credit quality of loans and receivables

The Group manages credit quality of its loans and receivables, (neither overdue nor impaired, net of allowance) through an internal rating system. Segregation of credit quality is as follows (Unit: Korean Won in millions):

	December 31, 2016
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Upper grade(*1)		16,058,288		20,242,260		41,461,420		18,755,963		5,337,033		65,554,416		128,374,017		230,228,981
Lower grade(*2)		17		—		7,941,871		12,550,282		1,763,658		22,255,811		3,680,920		25,936,748
Total		16,058,305		20,242,260		49,403,291		31,306,245		7,100,691		87,810,227		132,054,937		256,165,729
Value of collateral(*3)		—		358,456		18,003,674		25,493,006		3,996,162		47,492,842		111,054,910		158,906,208
	December 31, 2017
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Upper grade(*1)		8,823,576		26,845,309		43,613,460		23,191,627		4,623,750		71,428,837		135,893,496		242,991,218
Lower grade(*2)		—		—		6,565,274		10,767,062		898,536		18,230,872		3,835,030		22,065,902
Total		8,823,576		26,845,309		50,178,734		33,958,689		5,522,286		89,659,709		139,728,526		265,057,120
Value of collateral(*3)		1,409		483,469		19,868,185		29,600,362		2,642,674		52,111,221		114,441,637		167,037,736

(*1) AAA~BBB for Corporates, and 1~6 level for Consumers

(*2) BBB- ~C for Corporates, and 7~10 level for Consumers

(*3) The value of collateral held is the recoverable amount when calculating the allowance for credit losses.

F-46

The total amount in the above table are net of allowances for credit losses, for loans and receivables neither overdue nor impaired, amounting to 828,944 million Won and 634,949 million Won as of December 31, 2016 and 2017, respectively.

b) Aging analysis of loans and receivables

Aging analysis of loans and receivables (overdue but not impaired, net of allowance) is as follows (Unit: Korean Won in millions):

	December 31, 2016
Past due	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Less than 30 days		—		—		45,255		41,329		—		86,584		584,995		671,579
30 to 59 days		—		—		1,553		8,933		—		10,486		90,296		100,782
60 to 89 days		—		—		337		2,123		—		2,460		49,151		51,611
Total		—		—		47,145		52,385		—		99,530		724,442		823,972
Value of collateral(*)		—		—		7,021		45,304		—		52,325		546,164		598,489

	December 31, 2017
Past due	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Less than 30 days		8		—		59,560		48,002		—		107,562		683,445		791,015
30 to 59 days		—		—		3,702		6,550		—		10,252		94,376		104,628
60 to 89 days		—		—		928		4,935		—		5,863		55,011		60,874
Total		8		—		64,190		59,487		—		123,677		832,832		956,517
Value of collateral(*)		—		—		4,619		46,513		—		51,132		619,867		670,999

(*) The value of collateral held is the recoverable amount used when calculating allowance for credit losses.

The total amounts in the above table are net of allowances for credit losses, for loans and receivables that are overdue but not impaired, amounting to 47,396 million Won and 50,580 million Won as of December 31, 2016 and 2017, respectively.

c) Impaired loans and receivables

Impaired loans and receivables, net of allowance are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Impaired loans		—		—		661,778		225,045		188,986		1,075,809		327,123		1,402,932
Value of collateral(*)		—		—		482,680		236,954		42,166		761,800		250,583		1,012,383

F-47

	December 31, 2017
	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Impaired loans		—		—		609,202		136,707		41,256		787,165		305,402		1,092,567
Value of collateral(*)		—		—		562,638		141,026		20,351		724,015		227,966		951,981

(*) The value of collateral held is the recoverable amount used when calculating allowance for credit losses.

The total amounts in the above table are net of allowances for credit losses, for impaired loans and receivables amounting to 1,150,756 million Won and 1,144,713 million Won as of December 31, 2016 and 2017, respectively.

4) Credit risk of debt securities

The Group manages debt securities based on the credit rating. Credit soundness of debt securities on the basis of External Credit Assessment Institution (“ECAI”), Korea’s qualified external rating agency, is as follows (Unit: Korean Won in millions):

	December 31, 2016
	Financial assets at FVTPL(*)		AFS debt securities		HTM securities		Total
AAA		1,658,332		12,490,934		13,342,384		27,491,650
AA- ~ AA+		720,535		3,372,310		466,401		4,559,246
BBB- ~ A+		266,049		618,736		101,466		986,251
Below BBB-		4,348		59,908		—		64,256
Total		2,649,264		16,541,888		13,910,251		33,101,403

	December 31, 2017
	Financial assets at FVTPL(*)		AFS debt securities		HTM securities		Total
AAA		1,685,099		9,897,689		15,806,327		27,389,115
AA- ~ AA+		722,923		2,386,567		888,547		3,998,037
BBB- ~ A+		236,311		876,482		52,188		1,164,981
Below BBB-		9,694		68,506		2,234		80,434
Total		2,654,027		13,229,244		16,749,296		32,632,567

(*) Financial assets at FVTPL comprise debt securities held for trading and financial assets designated at FVTPL.

(2) Market risk

Market risk is the possible risk of loss arising from trading activities and non-trading activities in the volatility of market factors such as interest rates, stock prices and foreign exchange rates.

Market risk occurs as a result of changes in the interest rates and foreign exchange rates for financial instruments that are not yet settled, and all contracts are exposed to a certain level of volatility according to changes in the interest rates, credit spreads, foreign exchange rates and the price of equity securities.

F-48

1) Market risk management

For trading activities and non-trading activities, the Group avoids, bears, or mitigates risks by identifying the underlying source of the risks, measuring parameters and evaluating their appropriateness.

At the beginning of each year, the Risk Management Committee establishes a Value at Risk (“VaR”, maximum losses) limit, loss limit and risk capital limit by subsidiaries for its management purposes. The limit by investment desk/dealer is independently managed to the extent of the limit given to subsidiaries and the limit by investment and loss cut is managed by the risk management personnel with department.

The Group uses both a standard-based and an internal model-based approach to measure market risk. The standard-based approach is used to calculate individual market risk of required capital while the internal model-based approach is used to calculate general capital market risk and it is used to measure internal risk management measure. For the trading activities, the Risk Management department measures the VaR limit by department, risk factor and loss limit on a daily basis and reports regularly to the Risk Management Committee.

2) Sensitivity analysis of market risk

The Group performs the sensitivity analyses both for trading and for non-trading activities.

For the trading activities, the Group uses a VaR model that uses certain assumptions of possible fluctuations in market conditions and, by conducting simulations of gains and losses, under which the model estimates the maximum losses that may occur. A VaR model predicts based on statistics of possible losses on the portfolio at a certain period currently or in the future. It indicates the maximum expected loss with at least 99% credibility. In short, there exists a one percent possibility that the actual loss might exceed the predicted loss generated from the VaR calculation. The actual results are periodically monitored to examine the validity of the assumptions and variables and factors that are used in VaR calculations. However, this approach cannot prevent the loss when the market fluctuation exceeds expectation.

For the non-trading activities, interest rate Earning at Risk (“EaR”) and interest rate VaR, which is based on the simulations of the Net Interest Income (“NII”) and Net Present Value (“NPV”), are calculated for the Bank, and the risks for all other subsidiaries are measured and managed by the interest rate EaR and the interest rate VaR calculations based on the Bank for International Settlements (“BIS”) Framework.

NII is a profit based indicator for displaying profit changes in the short term due to short term interest changes. It will be estimated as subtracting interest expenses of liabilities from the interest income of assets. NPV is an indicator for displaying risks in economic view according to unfavorable changes related to interest rate. It will be estimated as subtracting the present value of liabilities from the present value of assets.

EaR shows the maximum profit-loss amount, which indicates the maximum deduction amount caused by the unfavorable changes related to the interest rate of a certain period (i.e. 1 year). Interest rate VaR shows the potential maximum loss generated by the unfavorable changes during a certain period of time in the present or future.

F-49

a) Trading activities

The minimum, maximum and average VaR for the year ended December 31, 2016 and 2017, respectively, and the VaR as of December 31, 2016 and 2017, respectively, are as follows (Unit: Korean Won in millions):

	As of December 31, 2016			For the year ended December 31, 2016									As of December 31, 2017			For the year ended December 31, 2017
Risk factor				Average			Maximum			Minimum						Average			Maximum			Minimum
Interest rate		3,250			2,844			6,430			1,367			4,183			3,799			4,918			2,467
Stock price		4,191			3,456			5,063			2,304			909			2,863			4,419			909
Foreign currencies		4,396			4,914			7,686			3,967			4,750			5,051			6,636			4,061
Commodity price		152			113			325			21			—			31			188			—
Diversification		(5,630	)		(5,355	)		(10,385	)		(4,034	)		(4,472	)		(4,621	)		(6,798	)		(2,067	)
Total VaR(*)		6,359			5,972			9,119			3,625			5,370			7,123			9,363			5,370

(*) VaR= Value at Risk

b) Non-trading activities

The NII and NPV are calculated for the assets and liabilities owned by the Bank, respectively, by using the simulation method. The scenario responding to interest rate (“IR”) changes are as follows (Unit: Korean Won in millions):

Name of scenario	December 31, 2016				December 31, 2017
	NII(*1)		NPV(*2)		NII(*1)		NPV(*2)
Base case		4,367,411		21,556,632		4,916,138		23,472,792
Base case (Prepay)		4,384,783		20,666,425		4,916,015		23,163,942
IR 100bp up		4,802,118		20,893,490		5,361,546		22,886,122
IR 100bp down		3,903,129		22,279,204		4,386,437		24,127,559
IR 200bp up		5,236,879		20,289,742		5,806,723		22,372,208
IR 200bp down		2,975,351		23,052,848		3,452,590		24,830,482
IR 300bp up		5,671,639		19,742,627		6,251,897		21,929,189
IR 300bp down		1,968,273		25,096,193		2,254,609		26,633,807

(*1) Net Interest Income

(*2) Net Portfolio Value

The interest EaR and VaR are calculated based on the BIS Framework of other subsidiaries excluding the Bank are as follows (Unit: Korean Won in millions):

December 31, 2016		December 31, 2017
EaR	VaR	EaR	VaR
188,381	110,335	255,679	130,821

F-50

The Group estimates and manages risks related to changes in interest rate due to the difference in the maturities of interest-bearing assets and the liabilities and discrepancies in the terms of interest rate. Cash flows of principal amounts and interests from interest bearing assets and liabilities by re-pricing date are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Within 3 months		4 to 6 months		7 to 9 months		10 to12 months		1 to 5 years		Over 5 years		Total
Asset:
Loans and receivables		148,237,350		42,032,667		8,064,502		7,757,087		55,838,192		35,245,734		297,175,532
AFS financial assets		3,165,094		2,946,992		2,854,514		2,915,226		5,029,918		713,596		17,625,340
HTM financial assets		2,770,079		1,515,213		1,246,503		1,143,170		6,853,951		892,030		14,420,946
Total		154,172,523		46,494,872		12,165,519		11,815,483		67,722,061		36,851,360		329,221,818
Liability:
Deposits due to customers		100,051,821		36,614,529		25,028,378		25,017,836		34,513,004		40,737		221,266,305
Borrowings		13,772,710		1,044,748		491,330		368,431		2,816,565		421,677		18,915,461
Debentures		2,109,235		2,077,681		860,455		1,545,943		14,613,799		4,143,773		25,350,886
Total		115,933,766		39,736,958		26,380,163		26,932,210		51,943,368		4,606,187		265,532,652

	December 31, 2017
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Asset:
Loans and receivables		161,653,892		41,671,530		7,614,159		6,411,841		54,150,998		26,272,958		297,775,378
AFS financial assets		2,150,708		2,500,103		2,016,711		2,367,762		4,229,000		601,735		13,866,019
HTM financial assets		2,286,179		2,161,467		1,433,425		1,687,362		9,369,794		345,868		17,284,095
Total		166,090,779		46,333,100		11,064,295		10,466,965		67,749,792		27,220,561		328,925,492
Liability:
Deposits due to customers		106,815,564		37,750,367		25,117,556		27,585,458		37,518,878		91,246		234,879,069
Borrowings		9,865,249		1,056,579		412,966		437,431		2,709,010		479,827		14,961,062
Debentures		1,955,902		2,452,240		1,018,563		1,752,847		19,770,538		2,869,766		29,819,856
Total		118,636,715		41,259,186		26,549,085		29,775,736		59,998,426		3,440,839		279,659,987

3) Currency risk

Currency risk arises from monetary financial instruments denominated in foreign currencies other than the functional currency. Therefore, no currency risk arises from non-monetary items or financial instruments denominated in the functional currency.

F-51

Financial instruments in foreign currencies exposed to currency risk are as follows (Unit: USD in millions, JPY in millions, CNY in millions, EUR in millions, and Korean Won in millions):

	December 31, 2016
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Asset:
Loans and receivables		22,868		27,635,970		108,944		1,129,539		23,194		4,018,678		1,548		1,962,856		4,382,990		39,130,033
Financial assets at FVTPL		66		79,386		57		589		—		—		30		37,562		34,124		151,661
AFS financial assets		898		1,085,108		—		—		80		13,844		—		570		144,799		1,244,321
HTM financial assets		17		20,517		—		—		—		—		—		—		143,535		164,052
Total		23,849		28,820,981		109,001		1,130,128		23,274		4,032,522		1,578		2,000,988		4,705,448		40,690,067
	December 31, 2016
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Liability:
Financial liabilities at FVTPL		75		90,908		253		2,621		—		—		88		111,098		115,980		320,607
Deposits due to customers		11,294		13,648,729		124,790		1,293,835		18,950		3,283,291		651		825,165		2,402,076		21,453,096
Borrowings		7,193		8,692,792		3,243		33,625		—		—		222		280,894		115,332		9,122,643
Debentures		2,931		3,541,769		—		—		700		121,282		—		—		228,720		3,891,771
Other financial liabilities		2,235		2,700,703		12,390		128,464		1,508		261,278		245		310,396		846,990		4,247,831
Total		23,728		28,674,901		140,676		1,458,545		21,158		3,665,851		1,206		1,527,553		3,709,098		39,035,948
Off-balance accounts		8,593		10,384,163		28,675		297,304		1,061		183,883		374		473,845		312,187		11,651,382
	December 31, 2017
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Asset:
Loans and receivables		23,000		24,642,900		126,944		1,204,843		25,224		4,127,936		1,156		1,479,351		3,937,733		35,392,763
Financial assets at FVTPL		32		34,303		25		238		—		—		27		34,583		104,892		174,016
AFS financial assets		1,966		2,105,972		—		—		319		52,259		—		590		302,801		2,461,622
HTM financial assets		111		118,868		—		—		—		—		—		—		78,175		197,043
Total		25,109		26,902,043		126,969		1,205,081		25,543		4,180,195		1,183		1,514,524		4,423,601		38,225,444

F-52

	December 31, 2017
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Liability:
Financial liabilities at FVTPL		41		43,423		79		752		—		—		19		24,878		69,977		139,030
Deposits due to customers		13,744		14,725,686		195,176		1,852,440		21,865		3,578,142		883		1,129,802		2,396,826		23,682,896
Borrowings		6,604		7,080,118		2,218		21,056		—		—		247		315,685		242,874		7,659,733
Debentures		3,467		3,714,411		—		—		700		114,555		—		—		375,749		4,204,715
Other financial liabilities		2,392		2,562,740		16,125		153,043		1,802		294,950		129		165,189		588,625		3,764,547
Total		26,248		28,126,378		213,598		2,027,291		24,367		3,987,647		1,278		1,635,554		3,674,051		39,450,921
Off-balance accounts		8,108		8,687,009		33,624		319,127		1,199		196,261		406		519,843		176,886		9,899,126

(3) Liquidity risk

Liquidity risk refers to the risk that the Group may encounter difficulties in meeting obligations from its financial liabilities.

1) Liquidity risk management

Liquidity risk management is to prevent potential cash shortages as a result of mismatching the use of funds (assets) and sources of funds (liabilities) or unexpected cash outflows. The financial liabilities that are relevant to liquidity risk are incorporated within the scope of risk management. Derivatives instruments are excluded from those financial liabilities as they reflect expected cash flows for a pre-determined period.

Assets and liabilities are grouped by account under Asset Liability Management (“ALM”) in accordance with the characteristics of the account. The Group manages liquidity risk by identifying the maturity gap, and then gap ratio through performing various cash flows analysis (i.e. based on remaining maturity and contract period, etc.), while maintaining the gap ratio at or below the target limit.

2) Maturity analysis of non-derivative financial liabilities

a) Cash flows of principals and interests by remaining contractual maturities of non-derivative financial liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		678,813		1,529		94		47		154,325		—		834,808
Deposits due to customers		136,835,315		28,685,473		19,254,108		30,875,962		6,284,092		2,732,019		224,666,969
Borrowings		9,146,895		2,355,336		876,836		1,486,710		4,711,273		420,720		18,997,770
Debentures		2,108,780		2,077,387		860,596		1,518,524		14,641,016		4,116,768		25,323,071
Other financial liabilities		14,813,948		27,544		5,480		1,433		84,792		2,751,825		17,685,022
Total		163,583,751		33,147,269		20,997,114		33,882,676		25,875,498		10,021,332		287,507,640

F-53

	December 31, 2017
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		168,442		155,984		1,717		512		375		—		327,030
Deposits due to customers		148,008,777		29,563,310		18,175,348		32,468,110		7,409,118		2,624,594		238,249,257
Borrowings		6,115,732		1,893,173		1,489,272		1,178,107		3,924,681		479,568		15,080,533
Debentures		1,955,255		2,452,565		1,018,714		1,744,731		19,770,380		2,869,699		29,811,344
Other financial liabilities		7,121,342		162,871		825		1,003		128,940		2,730,001		10,144,982
Total		163,369,548		34,227,903		20,685,876		35,392,463		31,233,494		8,703,862		293,613,146

b) Cash flows of principals and interests of non-derivative financial liabilities by estimated redemption or withdrawal are as follows; (Unit: Korean Won in millions):

	December 31, 2016
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		678,813		1,529		94		47		154,325		—		834,808
Deposits due to customers		148,089,355		30,163,971		17,600,803		20,947,335		5,128,387		2,331,993		224,261,844
Borrowings		9,146,901		2,355,332		876,835		1,486,710		4,711,273		420,719		18,997,770
Debentures		2,108,780		2,077,387		860,596		1,518,524		14,641,016		4,116,768		25,323,071
Other financial liabilities		14,813,948		27,544		5,480		1,433		84,792		2,751,825		17,685,022
Total		174,837,797		34,625,763		19,343,808		23,954,049		24,719,793		9,621,305		287,102,515

	December 31, 2017
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		168,442		155,984		1,717		512		375		—		327,030
Deposits due to customers		159,146,602		31,298,562		16,667,130		21,995,294		6,487,047		2,278,756		237,873,391
Borrowings		6,115,732		1,893,173		1,489,272		1,178,107		3,924,681		479,568		15,080,533
Debentures		1,955,255		2,452,565		1,018,714		1,744,731		19,770,380		2,869,699		29,811,344
Other financial liabilities		7,121,342		162,871		825		1,003		128,940		2,730,001		10,144,982
Total		174,507,373		35,963,155		19,177,658		24,919,647		30,311,423		8,358,024		293,237,280

F-54

3) Maturity analysis of derivative financial liabilities is as follows (Unit: Korean Won in millions):

Derivatives held for trading purpose are not managed in accordance with their contractual maturity, but the Group holds such financial instruments with the purpose of disposing or redemption before their maturity. As such, those derivatives are incorporated as “Within 3 months” in the table below.

The cash flow by the maturity of derivative financial liabilities as of December 31, 2016 and 2017 is as follows:

	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
December 31, 2016		3,009,977		—		—		208		7,013		—		3,017,198
December 31, 2017		3,150,149		—		—		381		67,373		—		3,217,903

4) Maturity analysis of off-balance accounts

The Group provides guarantees on behalf of customers. A financial guarantee represents an irrevocable undertaking that the Group will meet a customer’s obligations to third parties if the customer fails to do so. Under a loan commitment, the Group agrees to make funds available to a customer in the future. Loan commitments which are usually for a specified term may be unconditionally cancellable or may persist, provided all conditions in the loan facility are satisfied or waived. Commitments to lend include commercial standby facilities and credit lines, liquidity facilities to commercial paper conduits and utilized overdraft facilities. The maximum limit to be paid by the Group in accordance with guarantees and loan commitment only applies to principal amounts. There are contractual maturities for financial guarantees, such as guarantees for debentures issued or loans, loan commitments, and other guarantees, however, under the terms of the guarantees and loan commitments, funds should be paid upon demand from the counterparty. Details of off-balance accounts are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Guarantees		14,761,784		12,859,715
Loan commitments		83,795,496		80,760,325

(4) Operational risk

The Group defines the operational risk that could cause a negative effect on capital resulting from inadequate internal process, labor work and systematic problem or external factors.

1) Operational risk management

The Group has been running the operational risk management system under Basel II. The Group developed advanced measurement approached to quantify required capital for operational risk. This system is used for reinforcement in foreign competitions, reducing the amount of risk capitals, managing the risk, and precaution for any unexpected occasions. This system has been tested by the independent third party, and this system approved by the Financial Supervisory Service.

2) Operational risk measurement

To quantify required capital for operational risk, the Group applies Advanced Measurement Approaches (AMA) using internal and external loss data, Business Environment and Internal Control Factors (BEICFs), and scenario analysis (SBA). For the operational risk management for its subsidiaries, the Group adopted the Basic Indicator Approach.

F-55

(5) Capital management

The Group complies with the standard of capital adequacy provided by financial regulatory authorities. The capital adequacy ratio is based on Basel III of Basel Committee on Banking Supervision and Basel III was applied from the end of December, 2013. The capital adequacy ratio is calculated by dividing required capital by asset (weighted with a risk premium – risk weighted assets) based on the consolidated financial statements of the Group.

According to this regulation, the Group is required to meet the following new minimum requirements: 6.25% and 5.38% Common Equity Tier 1 capital ratio, 7.75% and 6.88% Tier 1 capital ratio and 9.75% and 8.88% total capital ratio as of December 31, 2017 and 2016, respectively. The details are as follows (Unit: Korean won in millions):

	December 31, 2016
Tier 1 capital		15,714,480
Other Tier 1 capital		3,275,496
Tier 2 capital		3,910,513
Total risk-adjusted capital		22,900,489
Risk-weighted assets for credit risk		138,018,500
Risk-weighted assets for market risk		2,277,809
Risk-weighted assets for operational risk		9,431,814
Total risk-weighted assets		149,728,123
Common Equity Tier 1 ratio		10.50	%
Tier 1 capital ratio		12.68	%
Total capital ratio		15.29	%

	December 31, 2017
Tier 1 capital		16,074,987
Other Tier 1 capital		3,041,664
Tier 2 capital		3,486,555
Total risk-adjusted capital		22,603,206
Risk-weighted assets for credit risk		134,767,711
Risk-weighted assets for market risk		2,316,938
Risk-weighted assets for operational risk		9,677,559
Total risk-weighted assets		146,762,208
Common Equity Tier 1 ratio		10.95	%
Tier 1 capital ratio		13.03	%
Total capital ratio		15.40	%

5. OPERATING SEGMENTS

In evaluating the operational performance of the Group and allocating resources accordingly, the Group’s Chief Operation Decision Maker (the “CODM”) utilizes the information per types of customers. This financial information of the segments is regularly reviewed by the CODM to make decisions about resources to be allocated to each segment and evaluate its performance.

F-56

(1) Segment by types of customers

The Group’s reporting segments comprise the following customers: consumer banking, corporate banking, investment banking, capital market, credit card and headquarters and others. The reportable segments are classified based on the target customers for whom the service is being provided.

• Consumer banking: Loans/deposits and financial services for consumers, etc.

• Corporate banking: Loans/deposits and export/import, financial services for corporations, etc.

• Investment banking: Domestic/foreign investment, structured finance, M&A, Equity & fund investment related business, venture advisory related tasks, real estate SOC development practices etc.

• Capital market: Fund management, investment securities and derivatives business, etc.

• Credit Card: Credit card, cash service and card loan, etc. and

• Headquarter and others: Segments that do not belong to above operating segments

The details of operating income by each segment are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Consumer banking			Corporate banking			Investment banking			Capital market			Credit Card			Head- quarter and Others			Sub-total			Inter- segment transaction			Total
Net Interest income		1,289,088			1,699,913			5,601			40,913			378,019			743,092			4,156,626			605,274			4,761,900
Interest income		2,850,985			3,255,796			154,460			19,394			500,449			1,585,636			8,366,720			331,515			8,698,235
Interest expense		(1,227,921	)		(1,880,195	)		(18	)		(81	)		(122,430	)		(979,449	)		(4,210,094	)		273,759			(3,936,335	)
Inter-segment		(333,976	)		324,312			(148,841	)		21,600			—			136,905			—			—			—
Net non-interest income		554,957			513,686			115,111			18,015			98,034			279,437			1,579,240			(947,937	)		631,303
Non-interest income		886,057			503,321			489,659			5,760,567			871,486			3,245,543			11,756,633			(366,953	)		11,389,680
Non-interest expense		(353,032	)		(25,993	)		(374,548	)		(5,742,552	)		(773,452	)		(2,907,816	)		(10,177,393	)		(580,984	)		(10,758,377	)
Inter-segment		21,932			36,358			—			—			—			(58,290	)		—			—			—
Other expense		(1,790,292	)		(1,795,561	)		53,089			(44,187	)		(321,265	)		(470,592	)		(4,368,808	)		327,191			(4,041,617	)
Administrative expense		(1,782,234	)		(925,566	)		(14,933	)		(16,945	)		(124,362	)		(553,539	)		(3,417,579	)		267,192			(3,150,387	)
Impairment losses on credit loss and others		(8,058	)		(869,995	)		68,022			(27,242	)		(196,903	)		82,947			(951,229	)		59,999			(891,230	)
Operating income		53,753			418,038			173,801			14,741			154,788			551,937			1,367,058			(15,472	)		1,351,586
Non-operating income (expense)		(19,113	)		(2,189	)		43,728			197			(5,150	)		136,954			154,427			(54,067	)		100,360
Net income before income tax expense		34,640			415,849			217,529			14,938			149,638			688,891			1,521,485			(69,539	)		1,451,946
Income tax expense		(8,383	)		(98,886	)		(52,642	)		(3,615	)		(32,780	)		(136,891	)		(333,197	)		(43,357	)		(376,554	)
Net income		26,257			316,963			164,887			11,323			116,858			552,000			1,188,288			(112,896	)		1,075,392

F-57

	For the year ended December 31, 2016
	Consumer banking			Corporate banking			Investment banking			Capital market			Credit Card			Head- quarter and Others			Sub-total			Inter- segment transaction			Total
Net Interest income		1,484,233			1,741,140			14,613			48,826			428,095			713,678			4,430,585			588,959			5,019,544
Interest income		2,979,811			3,026,148			153,160			19,575			556,681			1,492,148			8,227,523			284,789			8,512,312
Interest expense		(1,023,290	)		(1,780,990	)		(225	)		(324	)		(128,586	)		(863,523	)		(3,796,938	)		304,170			(3,492,768	)
Inter-segment		(472,288	)		495,982			(138,322	)		29,575			—			85,053			—			—			—
Net non-interest income		557,410			550,194			160,885			4,033			79,713			302,800			1,655,035			(955,695	)		699,340
Non-interest income		923,810			535,514			605,026			7,590,087			986,147			4,563,280			15,203,864			(433,879	)		14,769,985
Non-interest expense		(405,912	)		(32,873	)		(444,141	)		(7,586,054	)		(906,434	)		(4,173,415	)		(13,548,829	)		(521,816	)		(14,070,645	)
Inter-segment		39,512			47,553			—			—			—			(87,065	)		—			—			—
Other expense		(1,875,579	)		(1,476,190	)		(110,863	)		(51,995	)		(364,137	)		(574,606	)		(4,453,370	)		308,692			(4,144,678	)
Administrative expense		(1,788,672	)		(966,878	)		(14,983	)		(17,964	)		(148,001	)		(793,978	)		(3,730,476	)		252,000			(3,478,476	)
Impairment losses on credit loss and others		(86,907	)		(509,312	)		(95,880	)		(34,031	)		(216,136	)		219,372			(722,894	)		56,692			(666,202	)
Operating income		166,064			815,144			64,635			864			143,671			441,872			1,632,250			(58,044	)		1,574,206
Non-operating income (expense)		(35,081	)		(1,619	)		46,559			(5,288	)		(1,504	)		55,291			58,358			(79,175	)		(20,817	)
Net income before income tax expense		130,983			813,525			111,194			(4,424	)		142,167			497,163			1,690,608			(137,219	)		1,553,389
Income tax expense		(31,698	)		(203,983	)		(26,909	)		1,071			(32,774	)		16,475			(277,818	)		1,962			(275,856	)
Net income		99,285			609,542			84,285			(3,353	)		109,393			513,638			1,412,790			(135,257	)		1,277,533

	For the year ended December 31, 2017
	Consumer banking			Corporate banking			Investment banking			Capital market			Credit Cards			Head- quarters and others			Sub-total			Inter- segment transaction			Total
Net Interest income		1,702,939			1,795,377			12,124			36,883			463,603			622,790			4,633,716			586,934			5,220,650
Interest income		3,149,625			2,964,813			148,500			18,834			599,550			1,360,734			8,242,056			308,631			8,550,687
Interest expense		(955,836	)		(1,681,652	)		(243	)		—			(135,947	)		(834,662	)		(3,608,340	)		278,303			(3,330,037	)
Inter-segment		(490,850	)		512,216			(136,133	)		18,049			—			96,718			—			—			—
Net non-interest income		649,950			571,336			152,168			69,671			73,537			389,004			1,905,666			(745,990	)		1,159,676
Non-interest income		802,387			680,778			366,523			9,548,399			1,163,575			2,683,407			15,245,069			(395,833	)		14,849,236
Non-interest expense		(253,961	)		(170,268	)		(214,355	)		(9,478,728	)		(1,090,038	)		(2,132,053	)		(13,339,403	)		(350,157	)		(13,689,560	)
Inter-segment		101,524			60,826			—			—			—			(162,350	)		—			—			—
Other income(expense)		(1,906,561	)		(1,149,288	)		(63,835	)		14,662			(398,652	)		(939,406	)		(4,443,080	)		219,496			(4,223,584	)
Administrative expense		(1,808,974	)		(832,429	)		(12,881	)		(16,567	)		(163,536	)		(954,238	)		(3,788,625	)		257,824			(3,530,801	)
Impairment losses due to credit loss and others		(97,587	)		(316,859	)		(50,954	)		31,229			(235,116	)		14,832			(654,455	)		(38,328	)		(692,783	)
Operating income		446,328			1,217,425			100,457			121,216			138,488			72,388			2,096,302			60,440			2,156,742
Non-operating income (expense)		(98,510	)		(3,153	)		39,350			—			(5,219	)		(112,734	)		(180,266	)		(26,970	)		(207,236	)
Net income before income tax expense		347,818			1,214,272			139,807			121,216			133,269			(40,346	)		1,916,036			33,470			1,949,506
Income tax expense		(84,172	)		(296,634	)		(33,834	)		(29,335	)		(32,055	)		63,396			(412,634	)		(6,784	)		(419,418	)
Net income		263,646			917,638			105,973			91,881			101,214			23,050			1,503,402			26,686			1,530,088

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(2) Information on products and services

The products of the Group are classified as interest-bearing products such as loans, deposits and debt securities and non-interest bearing products such as loan commitment, credit commitment, equity securities, and credit card service. This classification of products has been reflected in the segment information presenting interest income and non-interest income.

(3) Information on geographical areas

Among the Group’s revenue (interest income and non-interest income) from services, revenue from the domestic customers for the years ended December 31, 2015, 2016 and 2017 amounted to 18,974,359 million Won, 22,265,508 million Won and 22,279,666 million Won, respectively, and revenue from the foreign customers amounted to 1,113,556 million Won, 1,016,788 million Won and 1,120,257 million Won, respectively. Among the Group’s non-current assets (investments in joint ventures and associates, investment properties, premises and equipment and intangible assets), non-current assets attributed to domestic subsidiaries as of December 31, 2016 and 2017 are 3,498,327 million Won and 3,550,764 million Won, respectively, and foreign subsidiaries are 240,946 million Won and 233,732 million Won, respectively.

6. CASH AND CASH EQUIVALENTS

(1) Details of cash and cash equivalents are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Cash		2,113,739		2,009,363
Foreign currencies		742,340		617,155
Demand deposits		4,238,956		3,423,355
Fixed deposits		496,289		858,413
Total		7,591,324		6,908,286

(2) Significant transactions not involving cash inflows and outflows are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2016			2017
Changes in other comprehensive income (loss) due to valuation of AFS financial assets		12,586			(84,498	)
Changes in other comprehensive income (loss) of investment in associates		(7,937	)		612
Changes in other comprehensive income of foreign operations translation		28,712			(208,329	)
Changes in other comprehensive income related to valuation of cash flow hedging		10,371			777
Changes in other comprehensive income due to remeasurement of the net defined benefit liability		34,162			10,497
Changes in investments in associates due to equity swap and others		—			51,227
Changes in investments in associates due to accounts transfer		(156,708	)		(62,571	)
Changes in unpaid dividends of hybrid equity securities		5,187			(10,658	)

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(3) Adjustments of liabilities from financing activities in current year are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2017
	January 1, 2017		Issuances		Redemption			Not involving cash inflows and outflows								December 31, 2017
								Foreign Exchange			Variation of gains on valuation of hedged items			Others
Borrowings		18,769,515		9,057,999		(12,692,882	)		(350,429	)		—			503		14,784,706
Debentures		23,565,449		18,438,221		(13,620,520	)		(478,249	)		(39,373	)		4,123		27,869,651
Total		42,334,964		27,496,220		(26,313,402	)		(828,678	)		(39,373	)		4,626		42,654,357

7. FINANCIAL ASSETS AT FAIR VALUE THRUGH PROFIT OR LOSS

(1) Financial assets at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Financial assets held for trading		5,633,724		5,820,787
Financial assets designated at FVTPL		17,000		22,290
Total		5,650,724		5,843,077

(2) Financial assets held for trading are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Deposits:
Deposits indexed to gold prices		26,180		25,972
Securities:
Debt securities
Korean treasury and government agencies		519,337		540,438
Financial institutions		1,444,459		1,476,498
Corporates		681,120		627,397
Equity securities		35,983		21,666
Beneficiary certificates		23,891		13,041
Loaned securities		4,459		—
Sub-total		2,709,249		2,679,040
Derivatives instruments assets		2,898,295		3,115,775
Total		5,633,724		5,820,787

(3) Financial assets designated at FVTPL as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Debt securities		4,348		9,694
Equity securities		12,652		12,596
Total		17,000		22,290

F-60

8. AVAILABLE-FOR-SALE FINANCIAL ASSETS

Details of AFS financial assets are as follows (Unit: Korean Won in millions):

	As of December 31, 2016
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Debt securities:
Korean treasury and government agencies		3,778,688		13,700		(3,758	)		3,788,630
Financial institutions		6,310,517		7,585		(3,904	)		6,314,198
Corporates		4,336,195		93,957		(20,966	)		4,409,186
Asset-backed securities		250,630		—		(1,427	)		249,203
Bond denominated in foreign currencies		1,226,893		1,076		(16,105	)		1,211,864
Other debt securities		73,360		1,871		(3	)		75,228
Sub-total		15,976,283		118,189		(46,163	)		16,048,309
Equity securities		1,034,299		420,038		(724	)		1,453,613
Beneficiary certificates		2,802,847		40,405		(21,170	)		2,822,082
Securities loaned		493,625		3,040		(3,086	)		493,579
Total		20,307,054		581,672		(71,143	)		20,817,583

	As of December 31, 2017
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Debt securities:
Korean treasury and government agencies		2,338,760		1,193		(9,386	)		2,330,567
Financial institutions		5,225,921		1,504		(10,159	)		5,217,266
Corporates		2,727,016		3,851		(5,635	)		2,725,232
Asset-backed securities		309,518		—		(1,337	)		308,181
Bond denominated in foreign currencies		2,449,954		3,100		(10,475	)		2,442,579
Other debt securities		35,154		21		(12	)		35,163
Sub-total		13,086,323		9,669		(37,004	)		13,058,988
Equity securities		982,393		430,921		(2,236	)		1,411,078
Beneficiary certificates		697,655		18,701		(3,728	)		712,628
Securities loaned		169,988		664		(396	)		170,256
Total		14,936,359		459,955		(43,364	)		15,352,950

9. HELD-TO-MATURITY FINANCIAL ASSETS

Details of HTM financial assets are as follows (Unit: Korean Won in millions):

	As of December 31, 2016
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Korean treasury and government agencies		3,754,356		26,366		(6,391	)		3,774,331
Financial institutions		5,168,487		9,236		(4,940	)		5,172,783
Corporates		4,823,356		58,176		(7,093	)		4,874,439
Bond denominated in foreign currencies		164,052		—		(428	)		163,624
Total		13,910,251		93,778		(18,852	)		13,985,177

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	As of December 31, 2017
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Korean treasury and government agencies		3,994,857		6,944		(15,266	)		3,986,535
Financial institutions		7,245,426		2,923		(15,067	)		7,233,282
Corporates		5,311,970		12,367		(25,326	)		5,299,011
Bond denominated in foreign currencies		197,043		832		(1,024	)		196,851
Total		16,749,296		23,066		(56,683	)		16,715,679

10. LOANS AND RECEIVABLES

(1) Details of loans and receivables are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Due from banks		14,815,476		8,868,378
Loans		235,400,585		251,523,301
Other receivables		8,176,572		6,714,525
Total		258,392,633		267,106,204

(2) Details of due from banks are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Due from banks in local currency:
Due from the Bank of Korea		11,395,162			6,246,496
Due from the depository banks		3			30,003
Due from non-monetary financial institutions		9,811			150
Due from the Korea Exchange		1,625			50,000
Others		73,283			97,365
Allowance for credit losses		(2,798	)		(1,541	)
Sub-total		11,477,086			6,422,473
Due from banks in foreign currencies:
Due from banks on demand		877,636			794,353
Due from banks on time		1,684,631			972,915
Others		778,418			679,554
Allowance for credit losses		(2,295	)		(917	)
Sub-total		3,338,390			2,445,905
Total		14,815,476			8,868,378

F-62

(3) Details of restricted due from banks are as follows (Unit: Korean Won in millions):

Financial institution	Counterparty	December 31, 2016		Reason of restriction
Due from banks in local currency:
Due from the Bank of Korea	The Bank of Korea		11,395,162	Reserve deposits under BOK Act
Others	Samsung Investment & Securities Co., Ltd. and others		70,304	Reserve deposits of the futures, option and others
			11,465,466
Due from banks in foreign currencies:
Due from banks on demand	The Bank of Korea and others		854,612	Reserve deposits under BOK Act and others
Others	The People’s Bank of China and others		778,418	Reserve deposits and others
			1,633,030
			13,098,496

Financial institution	Counterparty	December 31, 2017		Reason of restriction
Due from banks in local currency:
Due from the Bank of Korea	The Bank of Korea		6,246,496	Reserve deposits under BOK Act
Others	the Korea Exchange and others		94,394	Central counter party KRW margin and others
			6,340,890
Due from banks in foreign currencies:
Due from banks on demand	The Bank of Korea and others		787,520	Reserve deposits under The BOK Act and others
Others	The People’s Bank of China and others		367,108	Reserve deposits and others
			1,154,628
			7,495,518

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(4) Details of loans are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Loans in local currency		191,309,481			200,213,230
Loans in foreign currencies		14,101,839			13,147,888
Domestic banker’s letter of credit		3,754,030			2,516,907
Credit card accounts		6,673,765			6,827,295
Bills bought in foreign currencies		7,758,575			8,197,159
Bills bought in local currency		414,451			334,714
Factoring receivables		96,763			137,523
Advances for customers on guarantees		25,197			23,620
Privately placed bonds		328,405			362,319
Securitized loans		252,690			563,152
Call loans		2,985,077			3,003,455
Bonds purchased under resale agreements		8,854,753			16,859,064
Loan origination costs and fees		458,639			510,860
Others		251,635			607,325
Present value discount		(13,827	)		(10,988	)
Allowance for credit losses		(1,850,888	)		(1,770,222	)
Total		235,400,585			251,523,301

(5) Details of other receivables are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
CMA accounts		190,000			135,000
Receivables		5,417,676			4,459,318
Accrued income		1,080,489			1,026,273
Telex and telephone subscription rights and refundable deposits		1,019,577			984,620
Other debtors		639,945			166,877
Allowance for credit losses		(171,115	)		(57,563	)
Total		8,176,572			6,714,525

(6) Changes in allowance for probable credit losses on loans and receivables are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Consumers			Corporates			Credit card			Others			Total
Beginning balance		(326,435	)		(2,128,090	)		(129,117	)		(370,264	)		(2,953,906	)
Net provision		(103,166	)		(744,416	)		(180,563	)		(83,994	)		(1,112,139	)
Recoveries of written-off loans		(29,219	)		(198,089	)		(34,207	)		—			(261,515	)
Charge-off		240,541			1,139,102			198,077			592			1,578,312
Sales of loans and receivables		2,518			138,055			—			866			141,439
Unwinding effect		12,514			99,854			—			—			112,368
Others		(186	)		7,390			—			10,180			17,384
Ending balance		(203,433	)		(1,686,194	)		(145,810	)		(442,620	)		(2,478,057	)

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	For the year ended December 31, 2016
	Consumers			Corporates			Credit card			Others			Total
Beginning balance		(203,433	)		(1,686,194	)		(145,810	)		(442,620	)		(2,478,057	)
Net provision		(73,356	)		(536,359	)		(207,730	)		(73,318	)		(890,763	)
Recoveries of written-off loans		(53,679	)		(192,183	)		(44,393	)		(19,233	)		(309,488	)
Charge-off		155,424			722,359			242,561			236,857			1,357,201
Sales of loans and receivables		2,055			113,177			—			91,800			207,032
Unwinding effect		10,319			66,901			—			—			77,220
Others		(1,188	)		13,457			—			(2,510	)		9,759
Ending balance		(163,858	)		(1,498,842	)		(155,372	)		(209,024	)		(2,027,096	)

	For the year ended December 31, 2017
	Consumers			Corporates			Credit card			Others			Total
Beginning balance		(163,858	)		(1,498,842	)		(155,372	)		(209,024	)		(2,027,096	)
Net provision		(131,275	)		(539,222	)		(203,968	)		12,192			(862,273	)
Recoveries of written-off loans		(45,060	)		(84,413	)		(51,366	)		(68	)		(180,907	)
Charge-off		142,099			453,249			228,640			63,181			887,169
Sales of loans and receivables		898			65,145			—			29,186			95,229
Unwinding effect		8,643			36,548			—			—			45,191
Others		908			211,729			1			(193	)		212,445
Ending balance		(187,645	)		(1,355,806	)		(182,065	)		(104,726	)		(1,830,242	)

11. THE FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES

(1) The fair value hierarchy

The fair value hierarchy is determined by the levels of judgment involved in estimating fair values of financial assets and liabilities. The specific financial instruments characteristics and respective market condition such as volume of transactions and transparency of transactions between market participants are considered when determining the classification of the inputs used in the valuations. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities. The Group maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value of its financial assets and financial liabilities. Fair value is measured based on the perspective of a market participant. As such, even when market information is not readily available, the Group’s own assumptions reflect those the Group believes a market participants would use for measuring those specific assets or liabilities at the measurement date.

The fair value measurement is described in the one of the following three levels used to classify fair value measurements:

• Level 1—fair value measurements are those derived from quoted prices (unadjusted) in active markets for identical assets or liabilities. The types of financial assets or liabilities generally included in Level 1 are publicly traded equity and debt securities and derivatives.

• Level 2—fair value measurements are those derived from inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly (i.e. prices) or indirectly (i.e. derived from prices). The types of financial assets or liabilities generally included in Level 2 are debt securities not traded in active markets and derivatives traded in OTC of which valuation techniques do not require significant judgment.

• Level 3—fair value measurements are those derived from valuation techniques that include significant inputs for the asset or liability that are not based on observable market data (unobservable inputs). The

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types of financial assets or liabilities generally included in Level 3 are non-publicly traded securities and derivatives and debt securities of which valuation techniques require significant judgments and subjectivity.

The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Group’s assessment of the significance of a particular input to a fair value measurement in its entirety requires judgment and consideration of factors specific to the asset or liability.

(2) Fair value hierarchy of financial assets and liabilities measured at fair value are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Level 1(*1)		Level 2(*1)		Level 3(*2)		Total
Financial assets:
Financial assets held for trading
Deposits		26,180		—		—		26,180
Debt securities		370,636		2,274,280		—		2,644,916
Equity securities		35,983		—		—		35,983
Beneficiary certificates		—		23,891		—		23,891
Loaned securities		4,459		—		—		4,459
Derivative instrument assets		3,233		2,871,909		23,153		2,898,295
Sub-total		440,491		5,170,080		23,153		5,633,724
Financial assets designed at FVTPL
Debt securities		—		—		4,348		4,348
Equity securities		—		—		12,652		12,652
Sub-total		—		—		17,000		17,000
AFS financial assets
Debt securities		2,288,917		13,759,392		—		16,048,309
Equity securities		428,678		—		1,024,935		1,453,613
Beneficiary certificates		—		2,291,571		530,511		2,822,082
Loaned securities		391,279		102,300		—		493,579
Sub-total		3,108,874		16,153,263		1,555,446		20,817,583
Derivative assets		—		140,478		99		140,577
Total		3,549,365		21,463,821		1,595,698		26,608,884
Financial liabilities:
Financial liabilities held for trading
Deposits		26,501		—		—		26,501
Derivative liabilities		1,750		2,974,703		33,524		3,009,977
Sub-total		28,251		2,974,703		33,524		3,036,478
Financial liabilities designated at FVTPL
Equity-linked securities		—		197		673,709		673,906
Debentures		—		92,974		—		92,974
Sub-total		—		93,171		673,709		766,880
Derivative liabilities		—		7,221		—		7,221
Total		28,251		3,075,095		707,233		3,810,579

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	December 31, 2017
	Level 1(*1)		Level 2(*1)		Level 3(*2)		Total
Financial assets:
Financial assets held for trading
Deposits		25,972		—		—		25,972
Debt securities		405,942		2,238,391		—		2,644,333
Equity securities		21,666		—		—		21,666
Beneficiary certificates		—		13,041		—		13,041
Derivative assets		1,021		3,093,272		21,482		3,115,775
Sub-total		454,601		5,344,704		21,482		5,820,787
Financial assets designated at FVTPL
Debt securities		—		—		9,694		9,694
Equity securities		—		—		12,596		12,596
Sub-total		—		—		22,290		22,290
AFS financial assets
Debt securities		2,710,172		10,348,815		—		13,058,987
Equity securities		399,214		—		1,011,864		1,411,078
Beneficiary certificates		—		68,722		643,906		712,628
Securities loaned		69,778		100,478		—		170,256
Sub-total		3,179,164		10,518,015		1,655,770		15,352,949
Derivative assets		—		59,272		—		59,272
Total		3,633,765		15,921,991		1,699,542		21,255,298
Financial liabilities:
Financial liabilities held for trading
Deposits		25,964		—		—		25,964
Derivative liabilities		2,613		3,126,585		20,951		3,150,149
Securities sold		—		—		—		—
Sub-total		28,577		3,126,585		20,951		3,176,113
Financial liabilities designated at FVTPL
Equity-linked securities		—		—		160,057		160,057
Debentures		—		91,739		—		91,739
Sub-total		—		91,739		160,057		251,796
Derivative liabilities		—		67,754		—		67,754
Total		28,577		3,286,078		181,008		3,495,663

(*1) There was no transfers between level 1 and level 2 of financial assets and liabilities measured at fair value. The Group recognizes transfers between levels at the end of reporting period in which events have occurred or conditions have changed.

(*2) Certain AFS financial assets were measured at cost as of December 31, 2016 and 2017, that are amounting to 43,202 million Won and 37,092 million Won, respectively. These unquoted equity instruments mostly represent minority investments in special purpose entity vehicles such as asset securitization structures. They are measured at cost because (a) observable inputs of financial information to measure fair value was not available to obtain, or (b) there is a significant variance in likely estimated cash flows or (c) the probabilities for the various estimated cash flows could not be measured reliably. In addition, there were no indicators of impairments in these investments and the Group has no intention to dispose these investments in the foreseeable future.

F-67

During the year, the Group disposed of certain financial assets which were carried at cost because they did not have quoted market prices in an active market and could not be reliably measured at fair value. The carrying amount and gain from disposal of these financial assets amounted to 1,266 million Won and 657 million Won for the year ended December 31, 2017, respectively.

Financial assets and liabilities designated at FVTPL, held-for-trading financial assets and liabilities, AFS financial assets, and derivative assets and liabilities are recognized at fair value. Fair value is the amount that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date.

Financial instruments are measured at fair value using a quoted market price in active markets. If there is no active market for a financial instrument, the Group determines the fair value using alternative assumptions and developing fair value measurement methods. Alternative assumptions and fair value measurement methods for each type of financial instruments are as follows:

	Fair value measurement methods	Input variables
Debt securities	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	Risk-free market rate, credit spread
Equity securities and Beneficiary certificates	Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.	Risk-free market rate, market risk premium, Beta, etc.
Derivatives	The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.	Risk-free market rate, forward rate, volatility, foreign exchange rate, stock prices, etc.
Equity-linked securities	The fair value of security linked to stock prices or derivatives is measured by the models such as DCF model, FDM, or Monte Carlo Simulation given the	Values of underlying assets, risk-free market rate, market rate, dividend and convenience yield, volatility, correlation

F-68

	Fair value measurement methods	Input variables
	natures of the securities or underlying assets.	coefficient, credit spread, and foreign exchange rate
Debentures	The fair value is measured by discounting the projected cash flows of a debenture by applying the market discount rate that is reflecting credit rating of the Group.	Risk-free market rate, forward rate

Valuation methods of financial assets and liabilities measured at fair value and classified into Level 3 and significant but unobservable inputs are as follows:

	Fair value measurement technique	Input variable	Range	Impact of changes in significant unobservable inputs on fair value measurement
Derivative assets	Option valuation model and others	Correlation coefficient	0.900~0.980	Variation of fair value increases as correlation coefficient increases.
		Volatility of underlying asset	12.1%~28.1%	Variation of fair value increases as volatility increases.
Derivative liabilities	Option valuation model and others	Correlation coefficient	0.900~0.980	Variation of fair value increases as correlation coefficient increases.
		Volatility of underlying asset	12.1%~28.1%	Variation of fair value increases as volatility increases.
Equity linked securities	Monte Carlo Simulation and others	Correlation coefficient	0.363~0.694	Equity linked securities’ variation of fair value increases if both volatility and correlation coefficient increase. However when correlation coefficient decreases, despite the increase in volatility, the variation of fair value of equity linked securities may decrease.
		Volatility of underlying asset	6.8%~58.9%
Equity securities and Beneficiary certificates	External appraisal value and others	Expected growth rate	0.0%~1.0%	Fair value increases as expected growth rate increases.
		Volatility of real estate sale price	0%	Fair value increases as sale price Increases
		Discount rate of lease cash flow and others	8.31%~8.54%	Fair value increases as discount rate of lease cash flow decreases

Fair value of financial assets and liabilities classified into level 3 is measured by the Group using its own valuation techniques or using external specialists. Unobservable inputs used in the fair value measurements are produced by the internal system of the Group and the appropriateness of inputs is reviewed regularly.

F-69

(3) Changes in financial assets and liabilities classified into level 3 are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	January 1, 2015		Net Income (loss)(*1)			Other comprehensive income (loss)			Purchases/ Issuances			Disposals/ Settlements			Transfer to or from level 3(*2)			December 31, 2015
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*5)		49,274		71,703			—			(8,166	)		(33,156	)		(979	)		78,676
Sub-total		49,274		71,703			—			(8,166	)		(33,156	)		(979	)		78,676
Financial assets designed at FVTPL
Equity-linked securities		6,066		—			—			—			(6,066	)		—			—
Debt securities		—		(14	)		—			1,000			—			—			986
Equity securities		10,567		1,042			—			—			—			—			11,609
Sub-total		16,633		1,028			—			1,000			(6,066	)		—			12,595
AFS financial assets
Equity securities(*3)		1,031,918		(57,373	)		105,290			105,930			(100,018	)		(92,379	)		993,368
Beneficiary certificates		355,694		3,905			(24,846	)		121,613			(79,296	)		—			377,070
Others		14,241		(7,064	)		1,370			—			(3,239	)		—			5,308
Sub-total		1,401,853		(60,532	)		81,814			227,543			(182,553	)		(92,379	)		1,375,746
Derivative assets		11,946		7,375			—			—			(13,348	)		—			5,973
Total		1,479,706		19,574			81,814			220,377			(235,123	)		(93,358	)		1,472,990
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*5)		41,711		58,565			—			4,008			(24,475	)		(1,202	)-		78,607
Financial liabilities designated at FVTPL
Equity-linked securities(*4)		361,993		(73,533	)		—			764,005			(304,917	)		(197	)		747,351
Total		403,704		(14,968	)		—			768,013			(329,392	)		(1,399	)		825,958

F-70

	For the year ended December 31, 2016
	January 1, 2016		Net Income (loss)(*1)			Other comprehensive income (loss)			Purchases/ Issuances		Disposals/ Settlements			Transfer to or from level 3(*2)			December 31, 2016
Financial assets:
Financial assets held for trading
Derivative instrument assets(*6)		78,676		(29,117	)		—			13,640		(39,506	)		(540	)		23,153
Financial assets designed at FVTPL
Debt securities		986		(161	)		—			4,509		(986	)		—			4,348
Equity securities		11,609		1,043			—			—		—			—			12,652
Sub-total		12,595		882			—			4,509		(986	)		—			17,000
AFS financial assets
Equity securities(*3)		993,368		(6,986	)		57,323			205,749		(205,348	)		(19,171	)		1,024,935
Beneficiary certificates		377,070		(868	)		5,794			174,024		(25,509	)		—			530,511
Others		5,308		594			(643	)		—		(5,259	)		—			—
Sub-total		1,375,746		(7,260	)		62,474			379,773		(236,116	)		(19,171	)		1,555,446
Derivative assets		5,973		3,877			—			—		(9,751	)		—			99
Total		1,472,990		(31,618	)		62,474			397,922		(286,359	)		(19,711	)		1,595,698
Financial liabilities:
Financial liabilities held for trading Derivative liabilities		78,607		(8,322	)		—			1,155		(37,916	)		—			33,524
Financial liabilities designated at FVTPL
Equity-linked securities		747,351		71,079			—			—		(144,721	)		—			673,709
Total		825,958		62,757			—			1,155		(182,637	)		—			707,233

F-71

	For the year ended December 31, 2017
	January 1, 2017		Net Income (loss)(*1)			Other comprehensive income			Purchases/ Issuances		Disposals/ Settlements			Transfer to or out of level 3(*2)		December 31, 2017
Financial assets:
Financial assets held for trading
Derivative assets		23,153		22,362			—			1,398		(25,431	)		—		21,482
Financial assets designated at FVTPL
Debt securities		4,348		346			—			5,000		—			—		9,694
Equity securities		12,652		(56	)		—			—		—			—		12,596
Sub-total		17,000		290			—			5,000		—			—		22,290
AFS financial assets
Equity securities		1,024,935		27,986			24,442			65,961		(131,460	)		—		1,011,864
Beneficiary certificates		530,511		212			(4,321	)		226,975		(109,471	)		—		643,906
Sub-total		1,555,446		28,198			20,121			292,936		(240,931	)		—		1,655,770
Derivative assets		99		329			—			—		(428	)		—		—
Total		1,595,698		51,179			20,121			299,334		(266,790	)		—		1,699,542
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities		33,524		24,866			—			500		(37,939	)		—		20,951
Financial liabilities designated at FVTPL
Equity-linked securities		673,709		112,015			—			—		(625,667	)		—		160,057
Total		707,233		136,881			—			500		(663,606	)		—		181,008

(*1) From financial assets and liabilities classified as Level 3 that the Group holds as at the end of the year, losses of 2,854 million Won, 94,238 million Won and 34,621 million Won for the year ended December 31 2015, 2016 and 2017, respectively, were recognized in net gain (loss) on financial instruments at FVTPL and net gain (loss) on AFS financial assets in the comprehensive income statements.

(*2) The Group recognizes transfers between levels at the end of reporting period within which events have occurred or conditions have changed.

(*3) AFS financial assets were transferred out of level 1 to level 3 upon the change of the fair value measurement method of the assets by using market the external valuation specialists from previously using quoted prices in the active market, in the opposite case, they were transferred out of level 3 to level 1.

(*4) Since the observable market data for equity-linked securities was available, such securities were transferred out of Level 3 into Level 2.

(*5) As the variables used for the valuation of interest rate and equity related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.

(*6) As the variables used for the valuation of currency related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.

4) Sensitivity analysis on the unobservable inputs used for measuring level 3 financial instruments.

The sensitivity analysis of the financial instruments has been performed by classifying with favorable and unfavorable changes based on how changes in unobservable assumptions would have effects on the fluctuations of financial instruments’ value. When the fair value of a financial instrument is affected by more than one unobservable assumption, the below table reflects the most favorable or the most unfavorable changes which resulted from varying the assumptions individually. The sensitivity analysis was performed for two types of level 3 financial instruments: (1) debt securities, equity securities, interest rate related derivatives, currency related derivatives, equity related derivatives, and equity-linked securities of which fair value changes are recognized as

F-72

net income; (2) equity securities and beneficiary certificates of which fair value changes are recognized as other comprehensive income. Equity securities classified as level 3 but measured at costs are excluded from sensitivity analysis.

The following table shows the sensitivity analysis to disclose the effect of reasonably possible volatility on the fair value of a level 3 financial instruments for the years ended December 31, 2015, 2016 and 2017. (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Net income (loss)					Other comprehensive income (loss)
	Favorable		Unfavorable			Favorable		Unfavorable
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*1)(*2)		10,674		(9,729	)		—		—
Financial assets designed at FVTPL
Equity securities(*6)		793		(739	)		—		—
AFS Financial Assets
Equity securities(*3)(*4)		—		—			37,648		(20,869	)
Beneficiary certificates(*4)		—		—			4,102		(3,875	)
Others(*5)		—		—			80		(80	)
Total		11,467		(10,468	)		41,830		(24,824	)
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*1)(*2)		13,469		(12,281	)		—		—
Financial liabilities designated at FVTPL
Equity-linked securities(*1)		2,289		(2,247	)		—		—
Total		15,758		(14,528	)		—		—

	For the year ended December 31, 2016
	Net income (loss)					Other comprehensive income (loss)
	Favorable		Unfavorable			Favorable		Unfavorable
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*1)(*2)		861		(2,248	)		—		—
Financial assets designed at FVTPL
Debt securities(*6)		19		(18	)		—		—
Equity securities(*6)		688		(639	)		—		—
AFS Financial Assets
Equity securities(*3)(*4)		—		—			31,412		(18,551	)
Beneficiary certificates(*4)		—		—			2,903		(2,571	)
Total		1,568		(2,905	)		34,315		(21,122	)
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*1)(*2)		4,892		(3,568	)		—		—
Financial liabilities designated at FVTPL
Equity-linked securities(*1)		905		(857	)		—		—
Total		5,797		(4,425	)		—		—

F-73

	For the year ended December 31, 2017
	Net income (loss)					Other comprehensive income (loss)
	Favorable		Unfavorable			Favorable		Unfavorable
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*1)(*2)		1,234		(526	)		—		—
Financial assets designed at FVTPL
Debt securities(*6)		265		(309	)		—		—
Equity securities(*6)		670		(624	)		—		—
AFS Financial Assets
Equity securities(*3)(*4)		—		—			28,583		(15,246	)
Beneficiary certificates(*4)		—		—			1,861		(1,857	)
Total		2,169		(1,459	)		30,444		(17,103	)
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*1)(*2)		5		(513	)		—		—
Financial liabilities designated at FVTPL
Equity-linked securities(*1)		8		(7	)		—		—
Total		13		(520	)		—		—

(*1) Fair value changes of equity related derivatives assets and liabilities and equity-linked securities are calculated by increasing or decreasing historical volatility of the stock price and correlation, which are major unobservable variables, by 10%, respectively. In the case of interest rate related derivative assets and liabilities, fair value changes are calculated by increasing or decreasing the volatility of interest rate, which are major unobservable variables, by 10%, respectively.

(*2) Both derivative assets and liabilities for held for trading and hedging are included.

(*3) Fair value changes of equity securities are calculated by increasing or decreasing growth rate (0~1%) and discount rate or liquidation value (-1~1%) and discount rate. The growth rate, discount rate, and liquidation value are major unobservable variables.

(*4) Among the equity securities, whereas the sensitivity analysis of the capital contributions and beneficiary certificates is not possible in practice, fair value changes of such securities whose major unobservable variables are composed of the real estate are calculated by increasing or decreasing price fluctuation of real estate which is underlying assets and discount rate by 1%.

(*5) Fair value changes of other securities are calculated by increasing or decreasing price fluctuation of trust property or real estate which is underlying assets and discount rate by 1%. The prices of trust property and real estates and discount rate are major unobservable variables.

(*6) Fair value changes are measured by increasing or decreasing the discount rate by 10%, which is major unobservable variable, respectively.

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(5) Fair value and carrying amount of financial assets and liabilities that are recorded at amortized cost are as follows (Unit: Korean Won in millions):

	As of December 31, 2016
	Fair value								Book value
	Level 1		Level 2		Level 3		Total
Financial assets:
Held-to-maturity financial assets		741,880		13,243,297		—		13,985,177		13,910,251
Loans and receivables		—		—		259,565,952		259,565,952		258,392,633
Financial liabilities:
Deposits due to customers		—		221,001,466		—		221,001,466		221,020,411
Borrowings		—		18,785,325		—		18,785,325		18,769,515
Debentures		—		24,004,668		—		24,004,668		23,565,449
Other financial liabilities		—		21,984,171		—		21,984,171		21,985,086

	As of December 31, 2017
	Fair value								Book value
	Level 1		Level 2		Level 3		Total
Financial assets:
Held-to-maturity financial assets		1,206,292		15,509,387		—		16,715,679		16,749,296
Loans and receivables		—		—		265,570,649		265,570,649		267,106,204
Financial liabilities:
Deposits due to customers		—		234,682,775		—		234,682,775		234,695,084
Borrowings		—		14,754,506		—		14,754,506		14,784,706
Debentures		—		27,889,781		—		27,889,781		27,869,651
Other financial liabilities		—		13,890,789		—		13,890,789		13,892,461

The fair values of financial instruments are measured using quoted market price in active markets. In case there is no active market for financial instruments, the Group determines the fair value using alternative assumptions through developing fair value measurement methods. Alternative assumptions and fair value measurement methods for financial assets and liabilities that are measured at amortized costs are given as follows:

	Fair value measurement technique	Input variables
Debt securities	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	Risk-free market rate and credit spread
Loans and receivables	The fair value is measured by discounting the projected cash flows of loan products by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the debtor.	Risk-free market rate, credit spread and prepayment-rate
Deposit due to customers, borrowings, debentures, and other financial liabilities	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting credit rating of the Group.	Risk-free market rate and forward rate

F-75

12. DERECOGNITION AND OFFSET OF FINANCIAL INSTRUMENTS

(1) Derecognition of financial assets

1) The book value, fair value of, and maximum exposure to loss from the financial assets that were derecognized from the consolidated financial statements of the Group through disposals, but the Group still have continuous involvements are given as below:

2016

As of December 31

For the year ended December 31

Classification

Carrying amount of Continuing involvement

Fair value amount of Continuing involvement

Maximum exposure to loss

Gain(loss) recognized in the year

Accumulated Gain(loss) recognized

Asset

Liability

Asset

Liability

Conditional disposal of loans to KAMCO(*)

Off-balance item

—

—

—

—

701

—

—

2017

As of December 31

For the year ended December 31

Classification

Carrying amount of Continuing involvement

Fair value amount of Continuing involvement

Maximum exposure to loss

Gain(loss) recognized in the year

Accumulated Gain(loss) recognized

Asset

Liability

Asset

Liability

Conditional disposal of loans to KAMCO(*)

Off-balance item

—

—

—

—

—

—

—

(*) KAMCO is still in the process of collecting cash flows related to the transferred assets and the maximum exposure to loss represents the carrying amounts of the assets at the date when they were transferred to KAMCO. Under previous Korea Generally Accepted Accounting Principles (K-GAAP), the Group derecognized the transferred assets although the Group retains and continues to retain substantially all such risks and rewards and according to the transition exemptions in IFRS 1 “First-time adoption of International Financial Reporting Standard”, the Group did not reassess the derecognition criteria for these transfers. As the process of collecting cash flows is completed, there is no financial instruments that qualify for derecognition but the Group still has continuous involvement as of December 31, 2017.

2) Transferred financial assets that are not derecognized in their entirety

a) Disposal of securities under repurchase agreement

The financial instruments that were disposed but the Group agreed to repurchase at the fixed amounts at the same time, so that they did not meet the conditions of derecognition, are as follows:

		December 31, 2016		December 31, 2017
Assets transferred	AFS financial assets		2,546,683		9,998
	HTM financial assets		7,133		5,436
	Total		2,553,816		15,434
Related liabilities	Bonds sold under repurchase agreements		2,004,905		3,173

b) Loaned securities

When the Group loans its securities to outside parties, the legal ownerships of the securities are transferred, however, they should be returned at the end of lending period therefore the Group does not derecognize them from the consolidated financial statements as it owns majority of risks and benefits from the securities continuously regardless of the transfer of legal ownership.

F-76

		December 31, 2016		December 31, 2017		Loaned to
Financial assets at FVTPL	Equity securities- listed stock		4,459		—	Samsung Securities Co., Ltd. and others
AFS financial assets	Korean treasury and government agencies bonds		493,579		170,256	Korea Securities Depository and others
	Total		498,038		170,256

The details of the transferred financial assets that are not derecognized in their entirety, such as disposal of securities under repurchase agreement or loaned securities, are explained in Note 18.

(2) The offset with financial assets and liabilities

The Group has both receivables and payables related to the Korean exchange markets that meet the offsetting criteria under IAS 32 and therefore the net amount of uncollected Korean exchange receivables (or unpaid Korean exchange payables) is included in loan and receivables (or other financial liabilities) on the consolidated statement of financial position.

The Group has the right to offset certain derivatives assets and liabilities (including corresponding cash collateral placed or received) as well as certain spot foreign exchange receivables in case of default, insolvency or bankruptcy by one of the counterparties. These agreements do not qualify for offsetting on the Group’s balance sheet under IAS 32.

The Group has entered into a sale under repurchase agreements and accounted it as collateralized borrowing. Also, the Group has entered into a purchase under resale agreement and accounted it as secured loans. The repurchase and resale agreement can have the offsetting right only under the trading party’s default, insolvency, or bankruptcy which do not satisfy the offsetting criteria of IAS 32, the Group recorded the collateralized borrowings in borrowings and the secured loans in loans and receivables. The Group under the repurchase agreements has offsetting right only upon the counter-party’s default, insolvency or bankruptcy, thus the repurchase agreements are applied by the TBMA/ISMA Global Master Repurchase Agreement of which do not satisfy the offsetting criteria of IAS 32. The Group disclosed bonds sold (purchased) under repurchase agreements as borrowings (loans and receivables).

F-77

As at the end of reporting periods, the financial instruments to be set off and may be covered by master netting agreements and similar agreements are given as below:

	December 31, 2016
	Gross amounts of recognized financial assets		Gross amounts of recognized financial liabilities set off		Net amounts of financial assets presented		Related amounts not set off in the statement of financial position				Net amounts
							Offsetting     agreement		Cash collateral     received
Financial assets:
Derivative assets and others(*1)		2,962,969		8,442		2,954,527		6,546,232		69,834		1,016,550
Receivable spot exchange(*2)		4,678,089		—		4,678,089
Bonds purchased under resale agreements(*2)		8,854,753		—		8,854,753		8,854,753		—		—
Domestic exchanges receivable(*2)(*5)		31,456,123		30,883,281		572,842		—		—		572,842
Total		47,951,934		30,891,723		17,060,211		15,400,985		69,834		1,589,392

	December 31, 2016
	Gross amounts of recognized financial liabilities		Gross amounts of recognized financial assets set off		Net amounts of financial liabilities presented		Related amounts not set off in the statement of financial position				Net amounts
							Offsetting     agreement		Cash collateral     pledged
Financial liabilities:
Derivative liabilities and others(*1)		3,467,374		8,442		3,458,932		6,695,062		105,270		1,341,375
Payable spot exchange(*3)		4,682,775		—		4,682,775
Bonds sold under repurchase agreements(*4)		2,004,905		—		2,004,905		2,004,905		—		—
Domestic exchanges payable(*3)(*5)		39,345,524		30,883,281		8,462,243		6,161,151		—		2,301,092
Total		49,500,578		30,891,723		18,608,855		14,861,118		105,270		3,642,467

F-78

	December 31, 2017
	Gross amounts of recognized financial assets		Gross amounts of recognized financial assets set off		Net amounts of financial assets presented		Related amounts not set off in the consolidated statement of financial position				Net amounts
							Netting agreements and others		Cash collateral     received
Financial assets:
Derivative assets and others(*1)		2,992,476		1,710		2,990,766		5,787,448		174,415		796,629
Receivable spot exchange(*2)		3,767,726		—		3,767,726
Bonds purchased under resale agreements(*2)		16,859,064		—		16,859,064		16,859,064		—		—
Domestic exchanges receivable(*2)(*5)		39,050,227		38,985,354		64,873		—		—		64,873
Total		62,669,493		38,987,064		23,682,429		22,646,512		174,415		861,502

	December 31, 2017
	Gross amounts of recognized financial liabilities		Gross amounts of recognized financial liabilities set off		Net amounts of financial liabilities presented		Related amounts not set off in the consolidated statement of financial position				Net amounts
							Netting agreements and others		Cash collateral pledged
Financial liabilities:
Derivative liabilities and others(*1)		3,160,217		1,710		3,158,507		5,866,682		157,750		857,961
Payable spot exchange(*3)		3,723,886		—		3,723,886
Bonds sold under repurchase agreements(*4)		3,173		—		3,173		3,173		—		—
Domestic exchanges payable(*3)(*5)		40,284,515		38,985,354		1,299,161		1,293,931		—		5,230
Total		47,171,791		38,987,064		8,184,727		7,163,786		157,750		863,191

(*1) Others include derivatives held for trading, derivatives for hedging and equity linked securities related to derivatives.

(*2) Items are included in loans and receivables.

(*3) Items are included in other financial liabilities.

(*4) Items are included in borrowings.

(*5) Certain financial assets and liabilities are presented as offset.

F-79

13. INVESTMENTS IN JOINT VENTURES AND ASSOCIATES

(1) Investments in joint ventures and associates accounted for using the equity method of accounting are as follows (Unit: Korean Won in millions):

		Percentage of ownership (%)				Financial statement used as of
Investors and investees	Main business	December 31, 2016		December 31, 2017
Woori Bank and Woori Private Equity Asset Management Co., Ltd.:
Woori Blackstone Korea Opportunity No.1 Private Equity Fund(*19)	Other finance business		26.4		—	—
Woori Bank:
Kumho Tire Co., Inc.(*1)(*2)	Manufacturing		14.2		14.2	September 30(*3)
Woori Service Networks Co., Ltd.(*4)	Freight & staffing services		4.9		4.9	November 30(*3)
Korea Credit Bureau Co., Ltd.(*5)	Credit information		9.9		9.9	December 31
Korea Finance Security Co., Ltd.(*4)	Security service		15.0		15.0	November 30(*3)
Chin Hung International Inc.(*2)(*9)	Construction		28.4		25.3	November 30(*3)
Poonglim Industrial Co., Ltd.(*6)(*12)(*14)	Construction		31.0		29.4	September 30(*3)
STX Engine Co., Ltd.(*1)(*2)(*20)	Manufacturing		29.2		29.2	—
Samho International Co., Ltd.(*2)(*18)	Construction		7.8		—	—
Force TEC Co., Ltd.(*6)(*15)	Freight & staffing services		34.4		—	—
STX Corporation(*1)(*2)(*6)(*13)	Wholesale of non-specialized goods		9.5		19.7	September 30(*3)
Saman Corporation(*5)	General construction Technology service		9.2		9.2	September 30(*3)
Dongwoo C & C Co., Ltd.(*6)	Construction		23.2		23.2	—
SJCO Co., Ltd.(*6)	Aggregate transportation and wholesale		26.5		26.5	—
G2 Collection Co., Ltd.(*6)	Wholesale and retail sales		28.9		28.9	—
The Base Enterprise Co., Ltd.(*6)	Manufacturing		48.4		48.4	—
Heungjiwon Co., Ltd.(*6)(*17)	Other printing		27.8		—	—
Kyesan Engineering Co., Ltd.(*6)	Construction		23.2		23.2	—
Good Software Lap Co., Ltd.(*6)	Service		28.9		28.9	—
Wongwang Co., Ltd.(*6)	Wholesale and real estate		29.0		29.0	—
Sejin Construction Co., Ltd.(*6)	Construction		29.6		29.6	—
Deokwon Food Co., Ltd.(*6)(*17)	Poultry processing and storage		27.3		—	—
QTS Shipping Co., Ltd.(*6)	Complex transportation brokerage		49.4		49.4	—
DAEA SNC Co., Ltd.(*6)	Wholesale and retail sales		24.0		24.0	—
ARES-TECH Co., Ltd.(*6)	Electronic component manufacturing		23.4		23.4	—
Reading Doctors Co., Ltd.(*6)(*10)	Other service business		—		35.4	—
PREXCO Co., Ltd.(*6)(*10)	Manufacturing		—		28.1	—
Hyunwoo International Co., Ltd.(*6)(*10)	Manufacturing		—		25.9	—
Jiwon Plating Co., Ltd.(*6)(*16)	Plating		—		20.5	—
Cultizm Korea LTD Co., Ltd.(*6)(*16)	Wholesale and retail sales		—		31.3	—

F-80

		Percentage of ownership (%)				Financial statement used as of
Investors and investees	Main business	December 31, 2016		December 31, 2017
Gil Co.,Ltd.(*6)(*16)	Manufacturing		—		26.1	—
NK Eng Co., Ltd.(*6)(*10)	Manufacturing		—		23.1	—
Woori Growth Partnerships New Technology Private Equity Fund	Other financial business		23.1		23.1	December 31
2016KIF-IMM Woori Bank Technology Venture Fund	Other financial business		20.0		20.0	December 31
K BANK Co., Ltd.(*5)	Finance		13.0		13.8	November 30(*3)
Smart Private Equity Fund No.2(*11)	Other financial business		—		20.0	December 31
Woori Bank-Company K Korea Movie Asset Fund(*11)	Other financial business		—		25.0	December 31
Well to Sea No. 3 Private Equity Fund(*11)	Finance		—		50.0	September 30(*3)
Woori Private Equity Fund:
Woori Renaissance Holdings(*7)	Other financial business		51.6		—	—
Woori Private Equity Asset Management Co., Ltd.,:
Woori Columbus 1st Private Equity Fund(*8)	Other financial business		2.0		—	—
Woori Investment Bank Co., Ltd.
Nomura-Rifa Private Real Estate Investment Trust No.17(*11)	Other financial business		—		25.0	December 31

(*1) The Group has significant influence on these entities through its position in the creditors’ council which is the decision making body regarding to financial and operational policies of associates.

(*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won).

(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.

(*4) Most of the significant business transactions of associates are with the Group as of December 31, 2016 and 2017.

(*5) The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.

(*6) The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.

(*7) The Group owns over 50% ownership as of December 31, 2016. However, the investment in this entity was accounted for using equity method as the ownership and related contracts meet the definition of joint arrangement under IFRS 11 Joint Arrangements. As of December 31, 2017 the entity has been excluded from the range of associates as liquidated.

(*8) As a general partner of Woori Columbus 1st Private Equity Fund, the Group had significant influence over the entity’s operational and financial policy making process, including participating in making decision of

F-81

dividend or other distribution. As such, the investment in this entity was accounted for using equity method as of December 31, 2016. The Woori Columbus 1st Private Equity Fund has been removed from the list of associated companies as it was liquidated during the current period.

(*9) Due to consolidation of stocks and debt-equity swap, the Group’s number of holding shares and ownership ratio have decreased.

(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.

(*11) Due to capital contribution by the Group during the years ended December 31, 2017, the entities were included in the investment in associates.

(*12) The Group has sold a part of shares of the associates so the number of shares holding has decreased during the years ended December 31, 2017.

(*13) Due to debt-equity swap capital stock, the Group ownership ratio has increased during the years ended December 31, 2017.

(*14) As the carrying amounts of certain investments in associates had been reduced to zero, the Group discontinued the use of the equity method in accounting for those investments, and unrecognized losses due to the restricted application of equity method amount to 612 million Won and 16,344 million Won as of December 31, 2016 and 2017, respectively.

(*15) Not in scope for the associates, because the Group does not have significant influence over the entity due to the fact that it is going through workout process under receivership as of December 31, 2017.

(*16) Due to debt-equity swap, the entity was included in the investment in associates during the years ended December 31, 2017.

(*17) As the Group sold its entire ownership interest of the entities, it was exclude from the investment in associates during the years ended December 31, 2017.

(*18) The entity was sold after it was transferred to assets held for sale and was excluded from the investment in associates.

(*19) It has been removed from the list of associated companies as it was liquidated during the current period.

(*20) The shares of STX Engine Co., Ltd. owned by the Group were reclassified as assets held for sale, as the creditor financial institutions committee entered into a contract with UAMCO.,Ltd during the current period to sell STX Engine Co., Ltd. shares.

F-82

(2) Changes in the carrying value of investments in joint ventures and associates accounted for using the equity method of accounting are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Acquisition cost		January 1, 2015		Share of profits (losses)			Acquisi- tion(*3)		Disposal and others			Dividends			Change in Capital			Impairment			Other changes		December 31, 2015
Woori Blackstone Korea Opportunity Private Equity Fund No.1		81,608		100,436		9,266			—		(37,367	)		(16,291	)		—			—			—		56,044
Kumho Tire Co., Inc.		175,652		224,829		(11,979	)		—		—			—			1,201			—			—		214,051
Woori Service Networks Co., Ltd.		108		130		21			—		—			(12	)		—			—			—		139
Korea Credit Bureau Co., Ltd.		2,215		3,378		335			1,098		—			—			480			—			—		5,291
Korea Finance Security Co., Ltd.		3,337		4,272		(425	)		—		(81	)		(55	)		—			—			—		3,711
United PF 1st Corporate financial stability		191,617		203,418		3,350			—		(19,176	)		—			—			—			—		187,592
Chin Hung International Inc.		60,275		28,491		(14,489	)		29,451		—			—			482			—			—		43,935
Poonglim Industrial Co., Ltd.		13,917		—		10,643			—		—			—			(1	)		(22,472	)		17,143		5,313
STX Engine Co., Ltd.		47,008		2,293		(3,901	)		45,030		—			—			1,823			—			6,031		51,276
Samho Co., Ltd.		7,492		11,257		3,012			—		—			—			56			—			—		14,325
STX Corporation		42,215		14,347		(10,673	)		—		—			—			559			—			18		4,251
Osung LST Co., Ltd.		15,405		18,482		(4,322	)		—		—			—			4			(33,839	)		30,660		10,985
Saman Corporation		8,521		—		—			8,521		—			—			—			—			—		8,521
Phoenix Digital Tech Co., Ltd.		1,334		—		1,610			—		(1,610	)		—			—			—			—		—
Woori Renaissance Holdings		63,000		36,019		3,518			—		—			(2,416	)		—			—			—		37,121
Woori Columbus First PEF		1,200		1,084		222			—		—			—			—			—			—		1,306
Total		714,904		648,436		(13,812	)		84,100		(58,234	)		(18,774	)		4,604			(56,311	)		53,852		643,861

	For the year ended December 31, 2016
	Acquisition cost		January 1, 2016		Share of profits (losses)			Acquisi- tion(*1)		Disposal and others(*2)			Dividends			Change in Capital			Impairment			December 31, 2016
Woori Blackstone Korea Opportunity Private Equity Fund No.1		43,917		56,044		10,093			—		(37,036	)		(13,812	)		—			—			15,289
Kumho Tire Co., Inc.		175,652		214,050		(13,172	)		—		—			—			(546	)		—			200,332
Woori Service Networks Co., Ltd.		108		139		18			—		—			(12	)		—			—			145
Korea Credit Bureau Co., Ltd.		3,313		5,291		436			—		—			(135	)		—			—			5,592
Korea Finance Security Co., Ltd.		3,266		3,711		(281	)		—		—			(54	)		—			—			3,376
United PF 1st Corporate financial stability		172,441		187,592		3,265			—		(190,857	)		—			—			—			—
Chin Hung International Inc.		89,725		43,936		(996	)		—		—			—			92			—			43,032
Poonglim Industrial Co., Ltd.		13,916		5,313		(2,378	)		—		—			—			(2,935	)		—			—
STX Engine Co., Ltd.		92,038		51,276		(6,665	)		—		—			—			(1,575	)		—			43,036
Samho Co., Ltd.		7,492		14,325		5,392			—		—			—			12			—			19,729
STX Corporation		42,215		4,251		(4,222	)		—		—			—			(29	)		—			—
Osung LST Co., Ltd.		15,405		10,985		(2,903	)		—		(6,909	)		—			—			(1,173	)		—
Saman Corporation		8,521		8,521		252			—		—			—			(74	)		—			8,699
K-Growth crowd 2step Fund		800		—		(13	)		800		(787	)		—			—			—			—
Woori Growth Partnerships New Technology Private Equity Fund		13,602		—		(640	)		13,602		—			—			156			—			13,118
2016KIF-IMM Woori Bank Technology Venture Fund		1,800		—		—			1,800		—			—			—			—			1,800
K BANK Co.,Ltd.		32,500		—		(1,589	)		32,500		—			—			(469	)		—			30,442
Woori Renaissance Holdings		63,000		37,121		17,303			—		—			(2	)		—			—			54,422
Woori Columbus First PEF		1,200		1,306		(43	)		—		(1,065	)		(198	)		—			—			—
Total		780,911		643,861		3,857			48,702		(236,654	)		(14,213	)		(5,368	)		(1,173	)		439,012

F-83

	For the year ended December 31, 2017
	Acquisition cost		January 1, 2017		Share of profits (losses)			Acquisi- tion(*4)		Disposal and others(*5)			Dividends			Change in capital			Impairment			Others(*4)			December 31, 2017
Woori Blackstone Korea Opportunity No.1 Private Equity Fund		—		15,289		(4,617	)		—		(7,369	)		(3,303	)		—			—			—			—
Kumho Tire Co., Inc.		175,652		200,332		(102	)		—		—			—			1,545			(102,842	)		—			98,933
Woori Service Networks Co., Ltd.		108		145		21			—		—			(8	)		—			—			—			158
Korea Credit Bureau Co., Ltd.		3,313		5,592		371			—		—			(147	)		—			—			—			5,816
Korea Finance Security Co., Ltd.		3,266		3,376		197			—		—			(54	)		—			—			—			3,519
Chin Hung International Inc.		89,725		43,032		(14,375	)		41,053		—			—			1,535			—			(26,144	)		45,101
Poonglim Industrial Co., Ltd.		13,916		—		(6,733	)		—		—			—			—			—			6,733			—
STX Engine Co., Ltd.		92,038		43,036		(1,010	)		—		(46,217	)		—			4,191			—			—			—
Samho Co., Ltd.		7,492		19,729		2,021			—		(16,354	)		—			(73	)		(5,323	)		—			—
STX Corporation		42,215		—		(29,788	)		8,546		—			—			417			—			27,772			6,947
Saman Corporation		8,521		8,699		(733	)		—		—			—			26			(6,738	)		—			1,254
Woori Growth Partnerships New Technology Private Equity Fund		13,602		13,118		(582	)		15,729		(498	)		—			(156	)		—			—			27,611
2016KIF-IMM Woori Bank Technology Venture Fund		1,800		1,800		—			5,040		—			—			—			—			—			6,840
K BANK Co., Ltd.		32,500		30,442		(11,381	)		12,892		—			—			(245	)		—			27			31,735
Smart Private Equity Fund No.2		3,000		—		(68	)		3,000		—			—			—			—			—			2,932
Woori Bank-Company K Korea Movie Asset Fund		1,500		—		(43	)		3,000		—			—			—			—			—			2,957
Well to Sea No.3 Private Equity Fund		102,500		—		80,894			102,500		(508	)		—			(577	)		—			—			182,309
Woori Renaissance Holdings		—		54,422		(622	)		—		—			(57,109	)		—			—			3,309			—
Nomura-Rifa Private Real Estate Investment Trust No.17		1,000		—		(61	)		1,000		—			—			—			—			—			939
		592,148		439,012		13,389			192,760		(70,946	)		(60,621	)		6,663			(114,903	)		11,697			417,051

(*1) AFS financial assets decreased by 5,421 million Won due to transfers to investments in associates during the year ended December 31, 2016.

(*2) The transfers from investments in associates to AFS financial assets amounted to 155,220 million Won and the transfers from investments in associates to assets held for sale amounted to 6,909 million Won during the year ended December 31, 2016.

(*3) Investments in associates increased by 83,002 million Won due to transfers between accounts, such as loan-equity swap occurred during the year ended December 31, 2015.

(*4) Changes in investments in joint ventures and associates due to debt-equity swap is 51,227 million Won during the year ended December 31, 2017.

(*5) The Investments in Associates reclassified as assets held for sale amount to 62,571 million Won, of which 16,354 million Won was disposed of during the year ended December 31, 2017.

F-84

(3) Financial information relating to investments in joint ventures and associates accounted for using the equity method of accounting is as follows (Unit: Korean Won in millions):

	December 31, 2016
	Assets		Liabilities		Operating revenue		Net income (loss)
Woori Blackstone Korea Opportunity No.1 Private Equity Fund		57,971		427		75,084		38,226
Kumho Tire Co., Inc.		5,079,740		3,914,306		2,156,667		(53,328	)
Woori Service Networks Co., Ltd.		4,722		1,782		14,875		801
Korea Credit Bureau Co., Ltd.		71,245		17,322		59,868		3,517
Korea Finance Security Co., Ltd.		32,262		9,759		52,657		700
Chin Hung International Inc.		421,710		354,995		578,640		794
Poonglim Industrial Co., Ltd.		304,718		323,765		156,770		(15,135	)
STX Engine Co., Ltd.		865,265		769,481		372,295		(22,978	)
Samho Co., Ltd.		740,786		489,130		909,927		68,077
STX Corporation		781,622		1,087,469		1,252,968		(378,782	)
Saman Corporation		83,380		47,175		72,850		2,746
Woori Growth Partnerships New Technology Private Equity Fund		57,339		493		37		(2,177	)
2016KIF-IMM Woori Bank Technology Venture Fund		9,005		254		5		(250	)
K BANK Co., Ltd.		239,806		5,633		2,927		(12,222	)
Woori Renaissance Holdings Inc.		127,411		26,703		37,206		33,508
Woori Columbus 1st Private Equity Fund		811		506		3,764		(450	)

	December 31, 2017
	Assets		Liabilities		Operating revenue		Net income (loss)
Kumho Tire Co., Inc.		5,105,107		3,928,327		2,136,569		(61,748	)
Woori Service Networks Co., Ltd.		4,982		1,780		14,887		1,003
Korea Credit Bureau Co., Ltd.		75,504		19,323		68,750		3,580
Korea Finance Security Co., Ltd.		33,915		10,461		55,610		1,071
Chin Hung International Inc.		341,284		259,454		513,285		28,698
Poonglim Industrial Co., Ltd.		241,063		309,925		107,360		(29,812	)
STX Corporation		595,348		543,458		1,371,272		342,869
Saman Corporation		98,435		69,929		76,135		(6,096	)
Woori Growth Partnerships New Technology Private Equity Fund		120,133		485		1,024		(3,199	)
2016KIF-IMM Woori Bank Technology Venture Fund		32,815		380		6		(1,515	)
K BANK Co., Ltd.		1,244,270		1,001,121		19,231		(74,403	)
Smart Private Equity Fund No.2		14,711		51		1		(340	)
Woori Bank-Company K Korea Movie Asset Fund		11,830		2		16		(172	)
Well to Sea No.3 Private Equity Fund		5,068,424		4,534,957		131,488		162,743
Nomura-Rifa Private Real Estate Investment Trust No.17		20,265		16,507		62		(242	)

F-85

(4) The entities that the Group has not applied equity method of accounting although the Group’s ownership ratio is more than 20% as of December 31, 2016 and 2017, are as follows:

	As of December 31, 2016
	Number of shares owned		Ownership (%)
Orient Shipyard Co., Ltd.(*)		465,050		23.0	%
Saenuel Co., Ltd.(*)		3,531		37.4	%
E Mirae Tech Co., Ltd.(*)		7,696		41.0	%
Jehin Trading Co., Ltd.(*)		81,610		27.3	%
NK Eng Co., Ltd.(*)		697,033		23.1	%
The season Co., Ltd.(*)		18,187		30.1	%
Yuil PESC Co., Ltd.(*)		8,642		24.0	%
Youngdong Sea Food Co., Ltd.(*)		12,106		24.0	%
Sinseong Trading Co., Ltd.(*)		2,584		27.2	%
Reading Doctors Co., Ltd.(*)		7,398		35.4	%
PREXCO Co., Ltd.(*)		919,972		28.1	%
Hyunwoo International Co., Ltd.(*)		59,873		25.9	%

	As of December 31, 2017
	Number of shares owned		Ownership (%)
Orient Shipyard Co., Ltd.(*)		465,050		21.4	%
Saenuel Co., Ltd.(*)		3,531		37.4	%
E Mirae Tech Co., Ltd.(*)		7,696		41.0	%
Jehin Trading Co., Ltd.(*)		81,610		27.3	%
The season Co., Ltd.(*)		18,187		30.1	%
Yuil PESC Co., Ltd.(*)		8,642		24.0	%
Youngdong Sea Food Co., Ltd.(*)		12,106		24.0	%
Sinseong Trading Co., Ltd.(*)		2,584		27.2	%
CL Tech Co., Ltd.(*)		13,759		38.6	%
Force TEC Co., Ltd.(*)		4,780,907		25.8	%
Protronics Co., Ltd.(*)		95,921		48.1	%
Instern Co., Ltd.(*)		14,296		20.1	%

(*) Even though the Group’s ownership interest of the entity is more than 20%, the Group does not have significant influence over the entity since it is going through work-out process under receivership, thus it is excluded from the investment in associates.

F-86

(5) As of December 31, 2015, 2016 and 2017, the reconciliations from the net assets of associates based on the ownership ratio of the Group to its corresponding book value of investment in joint ventures and associates are as follows (Unit: Korean Won in millions except for ownership):

	As of December 31, 2015
	Total net asset			Ownership (%)		Net assets of associates (or joint ventures)			cost-book value differential(*1)		Impairment			Intercompany transaction and others			Book value
Woori Blackstone Korea Opportunity Private Equity Fund No.1		211,757			26.4		55,900			—		—			144			56,044
Kumho Tire Co., Inc.(*2)		1,152,161			14.2		163,042			48,459		—			2,549			214,050
Woori Service Networks Co., Ltd.		2,805			4.9		139			—		—			—			139
Korea Credit Bureau		50,884			9.9		5,043			248		—			—			5,291
Korea Finance Security Co., Ltd.		24,738			15.0		3,711			—		—			—			3,711
United PF 1st Corporate financial stability		1,057,935			17.7		187,538			—		—			54			187,592
Chin Hung International Inc.(*2)		68,132			28.4		19,374			24,566		—			(4	)		43,936
Poonglim Industrial Co., Ltd.(*2)		(58,065	)		30.7		(17,837	)		45,622		(22,472	)		—			5,313
STX Engine Co., Ltd.(*2)		123,969			29.2		36,230			14,927		—			119			51,276
SamHo Co., Ltd.		182,730			7.8		14,325			—		—			—			14,325
STX Corporation		50,421			15.0		7,552			24,610		(28,370	)		459			4,251
Osung LST Co., Ltd.		82,878			11.1		9,238			35,597		(33,839	)		(11	)		10,985
Saman Corporation		31,636			9.2		2,911			5,610		—			—			8,521
Woori Renaissance Holdings		67,203			51.6		34,677			—		(6,441	)		8,885			37,121
Woori Columbus First PEF		67,904			1.9		1,304			6		—			(4	)		1,306

	As of December 31, 2016
	Total net asset			Ownership (%)		Net assets of associates (or joint ventures)			cost-book value differential(*1)		Impairment			Intercompany transaction and others			Book Value
Woori Blackstone Korea Opportunity Private Equity Fund No.1		57,544			26.4		15,191			—		—			98			15,289
Kumho Tire Co., Inc.(*2)		1,055,219			14.2		149,324			48,459		—			2,549			200,332
Woori Service Networks Co., Ltd.		2,940			4.9		145			—		—			—			145
Korea Credit Bureau		53,923			9.9		5,344			248		—			—			5,592
Korea Finance Security Co., Ltd.		22,503			15.0		3,376			—		—			—			3,376
Chin Hung International Inc.(*2)		65,387			28.4		18,593			24,565		—			(126	)		43,032
Poonglim Industrial Co., Ltd.(*2)		(111,156	)		31.0		(34,463	)		54,149		(21,062	)		1,376			—
STX Engine Co., Ltd.		95,784			29.2		28,002			14,954		—			80			43,036
SamHo Co., Ltd.		251,656			7.8		19,729			—		—			—			19,729
STX Corporation(*2)		(250,018	)		9.5		(23,633	)		24,614		(27,904	)		26,923			—
Saman Corporation		36,205			9.2		3,326			5,373		—			—			8,699
Woori Growth Partnerships New Technology Private Equity Fund		56,846			23.1		13,118			—		—			—			13,118
2016KIF-IMM Woori Bank Technology Venture Fund		8,751			20.0		1,750			—		—			50			1,800
K BANK Co.,Ltd.		234,173			13.0		30,442			—		—			—			30,442
Woori Renaissance Holdings		100,708			51.6		51,965			—		(6,441	)		8,898			54,422
Woori Columbus First PEF		305			2.0		6			—		—			(6	)		—

F-87

	As of December 31, 2017
	Total net asset			Ownership (%)		Net assets of associates (or joint ventures)			Cost-book value differential(*1)		Impairment			Intercompany transaction and others			Book value
Kumho Tire Co., Inc.(*2 and *3)		1,065,421			14.2		150,767			48,459		(102,843	)		2,550			98,933
Woori Service Networks Co., Ltd.		3,202			4.9		158			—		—			—			158
Korea Credit Bureau Co., Ltd.		56,181			9.9		5,568			248		—			—			5,816
Korea Finance Security Co., Ltd.		23,454			15.0		3,519			—		—			—			3,519
Chin Hung International Inc.(*2)		81,686			25.3		20,671			24,565		—			(135	)		45,101
Poonglim Industrial Co., Ltd.(*2)		(168,154	)		29.4		(49,446	)		54,542		(20,504	)		15,408			—
STX Corporation		51,890			19.7		10,232			24,614		(27,904	)		5			6,947
Saman Corporation		28,506			9.2		2,619			5,373		(6,738	)		—			1,254
Woori Growth Partnerships New Technology Private Equity Fund		119,648			23.1		27,611			—		—			—			27,611
2016KIF-IMM Woori Bank Technology Venture Fund		32,435			20.0		6,487			—		—			353			6,840
K BANK Co., Ltd.		243,149			13.0		31,535			—		—			200			31,735
Smart Private Equity Fund No.2		14,660			20.0		2,932			—		—			—			2,932
Woori Bank-Company K Korea Movie Asset Fund		11,828			25.0		2,957			—		—			—			2,957
Well to Sea No.3 Private Equity Fund(*2)		364,909			50.0		182,366			—		—			(57	)		182,309
Nomura-Rifa Private Real Estate Investment Trust No.17		3,758			25.0		939			—		—			—			939

(*1) It is attributed as the difference between the acquisition cost and the corresponding net asset when the Group acquired the associates.

(*2) The net asset amount is after considering preferred stocks, debt-equity swap and others.

(*3) The Group recognized 102,843 million of impairment loss on the investment due to a significant and prolonged decline in the stock price of the investment below its book value.

14. INVESTMENT PROPERTIES

(1) Investment properties are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Acquisition cost		387,675			404,741
Accumulated depreciation		(29,178	)		(33,440	)
Net carrying value		358,497			371,301

F-88

(2) Changes in investment properties are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		357,550			351,496			358,497
Acquisition		—			4,428			9,872
Disposal		—			—			(458	)
Depreciation		(3,806	)		(3,762	)		(3,902	)
Transfer		(2,297	)		6,314			2,472
Classified to assets held for sale		—			—			(371	)
Foreign currencies translation adjustments		49			21			(324	)
Others		—			—			5,515
Ending balance		351,496			358,497			371,301

(3) Fair value of investment properties, which is determined by reference to Officially Assessed Reference Land Price (OARLP), announced by Ministry of Land, Transport and Maritime Affairs, and recent market transactions of similar, recently sold parcels nearby the subject properties in order to derive an indication of the most probable sales price (or value) of the subject properties, is amounting to 382,370 million Won and 396,587 million Won as of December 31, 2016 and 2017, respectively. The fair value of investment property, based on the assessment that was independently performed by external appraisal agencies, is classified as level 3 on the fair value hierarchy as of December 31, 2016 and 2017.

(4) Rental fee earned from investment properties is amounting to 5,629 million Won, 5,027 million Won and 4,579 million Won for the years ended December 31, 2015, 2016 and 2017, respectively.

15. PREMISES AND EQUIPMENT

(1) Premises and equipment are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Land		Building			Properties for business use			Structures in leased office			Construction in progress		Structures			Total
Acquisition cost		1,488,745		855,332			1,010,141			424,562			18,717		20			3,797,517
Accumulated depreciation		—		(163,633	)		(820,239	)		(355,604	)		—		(16	)		(1,339,492	)
Net carrying value		1,488,745		691,699			189,902			68,958			18,717		4			2,458,025

	December 31, 2017
	Land		Building			Properties for business use			Structures in leased office			Construction in progress		Structures			Total
Acquisition cost		1,487,278		867,804			1,024,186			429,665			64,559		20			3,873,512
Accumulated depreciation		—		(186,958	)		(844,114	)		(364,878	)		—		(17	)		(1,395,967	)
Net carrying value		1,487,278		680,846			180,072			64,787			64,559		3			2,477,545

F-89

(2) Changes in premises and equipment are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Land			Building			Properties for business use			Structures in leased office			Construction in progress			Structures			Total
Beginning balance		1,514,698			706,524			209,588			70,185			102			5			2,501,102
Acquisition		2,628			21,127			69,230			35,304			757			—			129,046
Disposal		(10,780	)		(648	)		(847	)		(2,000	)		(313	)		—			(14,588	)
Depreciation		—			(24,846	)		(85,279	)		(36,740	)		—			(1	)		(146,866	)
Classified to assets held for sale		(5,109	)		(8,348	)		—			—			—			—			(13,457	)
Foreign currencies translation adjustment		(328	)		(333	)		265			515			(19	)		—			100
Transfer		(7,481	)		9,778			—			—			—			—			2,297
Others		—			763			334			12,480			(5	)		—			13,572
Ending balance		1,493,628			704,017			193,291			79,744			522			4			2,471,206

	For the year ended December 31, 2016
	Land			Building			Properties for business use			Structures in leased office			Construction in progress			Structures		Total
Beginning balance		1,493,628			704,017			193,291			79,744			522			4		2,471,206
Acquisition		—			15,939			74,336			19,615			21,231			—		131,121
Disposal		(30	)		(1,474	)		(233	)		(2,623	)		(102	)		—		(4,462	)
Depreciation		—			(24,887	)		(82,445	)		(48,587	)		—			—		(155,919	)
Classified to assets held for sale		(4,063	)		(251	)		—			—			—			—		(4,314	)
Foreign currencies translation adjustment		625			516			307			376			153			—		1,977
Acquisition through business combination		—			—			209			442			—			—		651
Transfer		(1,415	)		(1,557	)		—			—			(3,087	)		—		(6,059	)
Others		—			(604	)		4,437			19,991			—			—		23,824
Ending balance		1,488,745			691,699			189,902			68,958			18,717			4		2,458,025

F-90

	For the year ended December 31, 2017
	Land			Building			Properties for business use			Structures in leased office			Construction in progress			Structures			Total
Beginning balance		1,488,745			691,699			189,902			68,958			18,717			4			2,458,025
Acquisition		4,755			22,579			59,694			23,420			51,797			—			162,245
Disposal		(1,840	)		(2,593	)		(442	)		(1,231	)		—			—			(6,106	)
Depreciation		—			(26,156	)		(74,223	)		(31,728	)		—			(1	)		(132,108	)
Classified from(to) assets held for sale		(2,693	)		(1,059	)		549			—			—			—			(3,203	)
Foreign currencies translation adjustment		(1,493	)		(1,393	)		(2,023	)		(1,315	)		(402	)		—			(6,626	)
Transfer		(196	)		(2,134	)		5,411			—			(5,553	)		—			(2,472	)
Others		—			(97	)		1,204			6,683			—			—			7,790
Ending balance		1,487,278			680,846			180,072			64,787			64,559			3			2,477,545

16. INTANGIBLE ASSETS AND GOODWILL

(1) Intangible assets are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Goodwill		Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Acquisition cost		124,803		185,202			714			299,031			622,540			26,884			1,259,174
Accumulated amortization		—		(149,725	)		(401	)		(160,335	)		(458,088	)		—			(768,549	)
Accumulated impairment losses		—		—			—			—			(88	)		(6,798	)		(6,886	)
Net carrying value		124,803		35,477			313			138,696			164,364			20,086			483,739

	December 31, 2017
	Goodwill		Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Acquisition cost		108,707		203,418			1,063			413,296			634,150			27,337			1,387,971
Accumulated amortization		—		(162,746	)		(524	)		(182,846	)		(516,467	)		—			(862,583	)
Accumulated impairment losses		—		—			—			—			(137	)		(6,652	)		(6,789	)
Net carrying value		108,707		40,672			539			230,450			117,546			20,685			518,599

F-91

(2) Changes in intangible assets are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Goodwill			Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Beginning balance		107,541			47,821			328			55,337			60,807			23,894			295,728
Acquisition		—			7,347			96			16,751			196,139			2,510			222,843
Disposal		—			(189	)		—			(1,500	)		(12	)		—			(1,701	)
Amortization		—			(16,809	)		(81	)		(19,233	)		(53,969	)		—			(90,092	)
Impairment losses		—			—			—			—			(9	)		(1,911	)		(1,920	)
Foreign currencies translation adjustment		(4,016	)		1			1			2			(476	)		147			(4,341	)
Others		—			—			—			—			(711	)		—			(711	)
Ending balance		103,525			38,171			344			51,357			201,769			24,640			419,806

	For the year ended December 31, 2016
	Goodwill		Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Beginning balance		103,525		38,171			344			51,357			201,769			24,640			419,806
Acquisition		—		8,708			64			92,969			30,842			2,306			134,889
Disposal		—		—			—			—			(23	)		(3,785	)		(3,808	)
Amortization		—		(15,795	)		(95	)		(18,657	)		(57,803	)		—			(92,350	)
Impairment losses		—		—			—			—			3,230			(1,585	)		1,645
Foreign currencies translation adjustment		7,338		16			—			—			853			50			8,257
Acquisition through business combination		7,857		162			—			—			—			43			8,062
Others		6,083		4,215			—			13,027			(14,504	)		(1,583	)		7,238
Ending balance		124,803		35,477			313			138,696			164,364			20,086			483,739

	For the year ended December 31, 2017
	Goodwill			Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Beginning balance		124,803			35,477			313			138,696			164,364			20,086			483,739
Acquisition		105			9,722			349			122,849			22,531			1,867			157,423
Disposal		—			—			—			—			(37	)		(944	)		(981	)
Amortization		—			(16,258	)		(123	)		(22,534	)		(60,869	)		—			(99,784	)
Impairment losses		—			—			—			—			(78	)		(159	)		(237	)
Transfer		—			7,987			—			(7,987	)		—			—			—
Foreign currencies translation adjustment		(16,201	)		(952	)		—			(483	)		(2,742	)		(160	)		(20,538	)
Others		—			4,696			—			(91	)		(5,623	)		(5	)		(1,023	)
Ending balance		108,707			40,672			539			230,450			117,546			20,685			518,599

F-92

17. ASSETS HELD FOR SALE

Assets held for sale are as follows (Unit: Korean Won in millions):

	December 31, 2017		December 31, 2016
Investments in joint ventures and associates(*)		46,217		—
Premises and equipment		2,407		2,342
Total		48,624		2,342

(*) The shares of STX Engine Co., Ltd. owned by the Group are reclassified as assets held for sale, as the creditor financial institutions committee has entered into a contract with UAMCO., Ltd for the year ended December 31, 2017, to sell STX Engine Co., Ltd. shares.

18. ASSETS SUBJECT TO LIEN AND ASSETS ACQUIRED THROUGH FORECLOSURES

(1) Assets subjected to lien are as follows (Unit: Korean Won in millions):

		December 31, 2016
		Collateral given to	Amount		Reason for collateral
Loan and receivables	Due from banks in local currency	Samsung Securities and others		24,589	Margin deposit for futures and options and others
	Due from banks in foreign currencies	Korea Investment & Securities and others		227,249	Foreign margin deposit for future or option and others
Financial assets at FVTPL	Industrial and financial debt securities and others	Yuanta Securities and others		473,476	Substitute securities and others
AFS financial assets	Korean treasury and government agencies bonds	Korea Securities Depository and others		2,546,683	Related to bonds sold under repurchase agreements(*)
	Financial institutions debt securities and others	The BOK and others		836,522	Settlement risk and others
HTM financial assets	Korean treasury and government agencies bonds	Korea Securities Depository and others		7,133	Related to bonds sold under repurchase agreements(*)
	Korean treasury and government agencies bonds and others	The BOK and others		6,185,295	Settlement risk and others
Lands and buildings		Credit Counselling & Recovery Service and others		6,310	Leasehold rights and others
		Total		10,307,257

F-93

		December 31, 2017
		Collateral given to	Amount		Reason for collateral
Loan and receivables	Due from banks on time in local currency	Bank of China and others		6,629	Collaterals for issuing letter of guarantee and others
	Due from banks in local currency	Samsung Securities Co., Ltd. and others		10,809	Margin deposit for futures or option
	Due from banks in foreign currencies	Korea Investment & Securities Co., Ltd. and others		9,136	Foreign margin deposit for future or option and others
Financial assets at FVTPL	Financial institutions debt securities and others	Yuanta Securities Co., Ltd. and others		501,523	Substitute securities and others
AFS financial assets	Corporate bonds	Korea Securities Depository and others		9,998	Related to bonds sold under repurchase agreements(*)
	Korean treasury and government agencies bonds and others	The BOK and others		1,570,608	Settlement risk and others
HTM financial assets	Korean treasury and government agencies bonds	Korea Securities Depository		5,436	Related to bonds sold under repurchase agreements(*)
	Financial institutions debt securities and others	The BOK and others		7,605,292	Settlement risk and others
Lands and buildings	Land and building	Credit Counselling & Recovery Service and others		6,186	Leasehold rights and others
		Total		9,725,617

(*) The Group enters into the repurchase agreements at predetermined price or original sale price added with certain rate of return after the disposal of securities. In this regards, the securities are provided as collaterals, and the purchasers are eligible to dispose or provide them as collateral. Therefore, as such securities have been transferred but have not been derecognized, the Group recognizes the relevant amount as liability (bond sold under repurchase agreements).

(2) The carrying amounts of buildings acquired through foreclosure are as follow (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Land		4,138		332
Building		1,852		44
Properties not used in business		202		—
Total		6,192		376

F-94

(3) Loaned securities are as follows (Unit: Korean Won in millions):

		December 31, 2016		December 31, 2017		Loaned to
Financial assets at FVTPL	Korean Equity securities		4,459		—	Samsung Securities Co., Ltd. and others
AFS financial assets	Korean treasury and government agencies bonds and others		493,579		170,256	Korea Securities Depository and others
Total			498,038		170,256

Loaned securities are lending of specific securities to borrowers who agree to return the same quantity of the same security at the end of lending period. As the Group does not derecognize these securities, there are no liabilities related to loaned securities.

(4) Collaterals held that can be disposed and re-collateralized regardless of defaults of counterparties

Fair values of collaterals held can be disposed and re-subjected to lien regardless of defaults of counterparties as of December 31, 2016 and 2017 are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Fair values of collaterals	Fair values of collaterals were disposed or re-subjected to lien
Securities	8,746,101	—

	December 31, 2017
	Fair values of collaterals	Fair values of collaterals were disposed or re-subjected to lien
Securities	17,671,490	—

19. OTHER ASSETS

Other assets are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Prepaid expenses		111,445		130,245
Advance payments		1,944		18,363
Non-operative assets		6,192		376
Others		9,265		9,420
Total		128,846		158,404

20. FINANCIAL LIABILITY AT FVTPL

(1) Financial liabilities at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Financial liabilities held for trading		3,036,478		3,176,113
Financial liabilities designated at FVTPL		766,880		251,796
Total		3,803,358		3,427,909

F-95

(2) Financial liabilities held for trading are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Deposits due to Customers:
Gold banking liabilities		26,501		25,964
Derivative liabilities		3,009,977		3,150,149
Total		3,036,478		3,176,113

(3) Financial liabilities designated at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Equity linked securities index:
Equity linked securities index in short position		673,906		160,057
Debentures:
Debentures in local currency		92,974		91,739
Total		766,880		251,796

(4) Credit risk adjustments to financial liabilities designated at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2015			December 31, 2016			December 31, 2017
Financial liabilities designated at FVTPL subject to credit risk adjustments		854,862			766,880			251,796
Credit risk adjustments(*1)		(433	)		(8	)		(254	)
Accumulated changes in credit risk adjustments(*2)		311			349			133

(*1) The amounts in the tabular disclosure relating to Credit risk adjustments at 31 December 2016 and at 31 December 2015 have been restated by 811 million Won and 109 million Won, respectively, due to an error in the previous year’s disclosure.

(*2) The amounts in the tabular disclosure relating to Accumulated changes in credit risk adjustments at 31 December 2016 and at 31 December 2015 have been restated by 16,139 million Won and 15,327 million Won, respectively, due to an error in the previous year’s disclosure.

Credit risk adjustments are applied to reflect the Group’s own credit risk when measuring the fair value of derivative liabilities. The methodology to determine the adjustment incorporates the Group’s credit spread as observed through credit ratings.

(5) The differences between financial liabilities at FVTPL’s carrying amount and nominal amount at maturity are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Carrying amount		766,880			251,796
Nominal amount at maturity		902,375			255,408
Difference		(135,495	)		(3,612	)

F-96

21. DEPOSITS DUE TO CUSTOMERS

Deposits sorted by interest type are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Deposits in local currency
Demand deposits		9,491,680			9,349,070
Time deposits		183,723,369			194,292,679
Mutual funds		37,128			34,055
Deposits on notes payables		943,446			1,323,679
Deposits on CMA		203,013			164,431
Certificate of deposits		3,836,430			4,436,443
Other deposits		1,360,176			1,451,841
Sub-total		199,595,242			211,052,198
Deposits in foreign currencies		21,453,096			23,682,896
Present value discount		(27,927	)		(40,010	)
Total		221,020,411			234,695,084

22. BORROWINGS AND DEBENTURES

(1) Borrowings are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Lenders	Interest rate (%)		Amount
Borrowings in local currency:
Borrowings from the Bank of Korea	The Bank of Korea		0.5 ~ 0.8		1,598,553
Borrowings from government funds	Small and Medium Business Corporation and others		0.0 ~ 3.5		1,534,807
Others	Seoul Metropolitan Government and others		0.0 ~ 3.8		3,922,878
Sub-total					7,056,238
Borrowings in foreign currencies:
Borrowings in foreign currencies	The Export-Import Bank of Korea and others		0.0 ~ 5.2		7,737,237
Offshore borrowings in foreign currencies	Wells Fargo		1.4		18,128
Sub-total					7,755,365
Bills sold	Others		0.0 ~ 1.6		26,895
Call money	Bank and others		0.0 ~ 5.1		1,926,779
Bonds sold under repurchase agreements	Other financial institutions		0.0 ~ 4.5		2,004,905
Present value discount					(667	)
Total					18,769,515

F-97

	December 31, 2017
	Lenders	Interest rate (%)		Amount
Borrowings in local currency:
Borrowings from The BOK	The BOK		0.5 ~ 0.8		1,404,087
Borrowings from government funds	Small Enterprise And Market Service and others		0.0 ~ 2.9		1,723,340
Others	The Korea Development Bank and others		0.0 ~ 3.2		3,957,421
Sub-total					7,084,848
Borrowings in foreign currencies:
Borrowings in foreign currencies	The Export-Import BOK and others		0.0 ~ 6.8		6,996,551
Offshore borrowings in foreign currencies	Commonwealth Bank		1.8		28,285
Sub-total					7,024,836
Bills sold	Others		0.0 ~ 1.2		36,953
Call money	Bank and others		1.5 ~ 2.7		635,061
Bonds sold under repurchase agreements	Other financial institutions		0.6 ~ 12.7		3,173
Present value discount					(165	)
Total					14,784,706

(2) Debentures are as follows (Unit: Korean Won in millions):

	December 31, 2016					December 31, 2017
	Interest rate (%)		Amount			Interest rate (%)		Amount
Face value of bond(*)
Ordinary bonds		1.5 ~ 11.8		18,268,403			1.5 ~ 5.8		22,468,908
Subordinated bonds		3.0 ~ 12.6		5,327,335			3.4 ~ 12.6		4,781,301
Other bonds		17.0		4,006			1.6 ~ 17.0		649,615
Sub-total				23,599,744					27,899,824
Discounts on bond				(34,295	)				(30,173	)
Total				23,565,449					27,869,651

(*) Included debentures under fair value hedge relationships are 3,610,193 million Won and 3,102,386 million Won as of December 31, 2016 and 2017, respectively. Also, debentures under cash flow hedge amounting to 699,029 million Won are included as of December 31, 2017

23. PROVISIONS

(1) Provisions are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Asset retirement obligation		58,076		61,872
Provision for guarantee (*1)		238,117		183,247
Provision for loan commitments		87,909		66,115
Provisions for customer reward credits		22,093		40,445
Other provisions (*2)		22,282		58,791
Total		428,477		410,470

F-98

(*1) Provision for guarantee includes provision for financial guarantee of 67,557 million Won and 71,697 million Won as of December 31, 2016 and 2017, respectively.

(*2) Other provisions consist of provision for litigation, provision for loss recovery, and others.

(2) Changes in provisions except for asset retirement obligation are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Provision for guarantees			Provision for loan commitments			Provisions for customer reward credits			Other provisions			Total
Beginning balance		509,320			90,449			5,548			56,959			662,276
Provisions provided		19,714			9,801			16,301			51,997			97,813
Provisions used and others		(25,262	)		41			(16,404	)		(86,308	)		(127,933	)
Reversal of unused amount		(160,032	)		(14,976	)		—			(43	)		(175,051	)
Others		20,401			(2	)		—			(24	)		20,375
Ending balance		364,141			85,313			5,445			22,581			477,480

	For the year ended December 31, 2016
	Provision for guarantees			Provision for loan commitments			Provisions for customer reward credits			Other provisions			Total
Beginning balance		364,141			85,313			5,445			22,581			477,480
Provisions provided		4,281			8,502			23,525			8,034			44,342
Provisions used and others		(80,017	)		22			(8,158	)		(11,323	)		(99,476	)
Reversal of unused amount		(64,061	)		(5,409	)		—			—			(69,470	)
Foreign currencies translation adjustments		—			—			—			2,990			2,990
Transfer(*1)		—			—			503			—			503
Others		13,773			(519	)		778			—			14,032
Ending balance		238,117			87,909			22,093			22,282			370,401

	For the year ended December 31, 2017
	Provision for guarantees			Provision for unused commitments			Provisions for customer reward credits			Other provisions			Total
Beginning balance		238,117			87,909			22,093			22,282			370,401
Provisions provided		4,876			2,028			62,593			42,042			111,539
Provisions used and others		(24,898	)		(68	)		(84,979	)		(8,014	)		(117,959	)
Reversal of unused amount		(60,300	)		(23,744	)		—			(77	)		(84,121	)
Foreign currencies translation adjustments		9			(10	)		—			(249	)		(250	)
Transfer(*2)		—			—			21,808			—			21,808
Others		25,443			—			18,930			2,807			47,180
Ending balance		183,247			66,115			40,445			58,791			348,598

(*1) As the credits of the affiliates were transferred to the Group, the allowance for the provisions for customer reward credits increased, for the year ended December 31, 2016.

(*2) According to contracts with the third parties, the Group ultimately will be reimbursed for which it has paid out on behalf of customers, which has incurred through their customer loyalty programs. Therefore, when such obligation incurs, the Group recognizes it as “transfer”, but there is no impact on the Group’s expense.

F-99

(3) Changes in asset retirement obligation are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		29,733			39,121			58,076
Provisions provided		1,742			2,034			2,225
Provisions used		(1,316	)		(1,279	)		(1,283	)
Amortization		394			464			428
Reversal of unused amount		(179	)		(1	)		(733	)
Increase in restoration costs and others		8,747			17,737			3,159
Ending balance		39,121			58,076			61,872

24. NET DEFINED BENEFIT LIABILITY (ASSET)

The characteristics of the Group’s defined benefit retirement pension plans characteristics are as follows:

Employees and directors with one or more years of service are entitled to receive a payment upon retirement of their employment, based on their length of service and rate of pay at the time of retirement. The assets of the plans are measured at their fair value at the end of reporting date. The plan liabilities are measured using the projected unit method, which takes account of projected earnings increases, using actuarial assumptions that give the best estimate of the future cash flows that will arise under the plan liabilities.

The Group is exposed to various risks through defined benefit retirement pension plan, and the most significant risks are as follows:

Volatility of Asset

The defined benefit obligation was estimated with a discount rate which is calculated based on the yield of blue chip corporate bonds in Korea. A deficit may occur if the rate of return on plan assets falls short of the discount rate. The plan assets include equity instruments and are exposed to the related volatility and risks.

Decrease in Yield of Blue Chip Bonds

A decrease in yield of blue chip bonds may result in increase in defined benefit liability although the increase in the value of some debt securities in the defined benefit plan would set it off partially.

Risk of Inflation

Defined benefit obligations are correlated to the inflation rate; the higher the inflation rate is, the more the liabilities are recognized mainly due to the fact that inflation rate would result in increase of employee salary growth rate. As a result, a deficit may occur in the plan. However, the plan assets are less impacted since the plan assets consist of mainly debt securities with fixed rates and of equity instruments.

(1) The net defined benefit liability(asset) is as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Defined benefit obligation		984,381			1,071,170
Fair value of plan assets		(990,653	)		(1,027,906	)
Net defined benefit liability(asset)		(6,272	)		43,264

F-100

The details of the net defined benefit liability (asset) per major subsidiaries as of December 31, 2017 is as follows:

	Woori Bank Co, Ltd.		Woori Card		Woori FIS		Others		Total
Net Defined Benefit Asset				1,487						1,487
Net Defined Benefit Liability(*)		14,284				28,883		1,584		44,751

(*) This number is before adjusting for internal transaction. As most entities other than Woori Bank Co, Ltd, deposit their plan asset to Woori Bank, adjusting internal transaction, the Group’s plan asset should be decreased by 43,113 million Won.

(2) Changes in the carrying value of defined benefit obligation are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		683,961			901,219			984,381
Current service cost		132,710			153,660			146,750
Interest expense		21,377			24,326			26,629
Remeasurements		97,730			(52,402	)		(20,389	)
Foreign currencies translation adjustments		(8	)		80			(279	)
Retirement benefit paid		(26,516	)		(34,346	)		(55,552	)
Curtailment or settlement		(8,231	)		(9,536	)		(10,928	)
Others		196			1,380			558
Ending balance		901,219			984,381			1,071,170

(3) Changes in the plan assets are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		608,370			801,528			990,653
Interest income		21,965			25,038			30,601
Remeasurements		(5,444	)		(7,304	)		(14,125	)
Employer’s contributions		229,069			226,752			43,114
Retirement benefit paid		(22,860	)		(33,341	)		(51,877	)
Curtailment or liquidation		(8,240	)		(9,198	)		(11,052	)
Others		(21,332	)		(12,822	)		40,592
Ending balance		801,528			990,653			1,027,906

(4) Plan assets wholly consist of time deposits as of December 31, 2016 and 2017, respectively. Among plan assets, realized returns on plan assets amount to 16,521 million Won, 17,734 million Won, and 16,476 million Won for the years ended December 31, 2015, 2016 and 2017, respectively. Meanwhile, the contribution expected to be paid in the subsequent accounting year amounts to 125,818 million Won.

(5) The various plans are funded, with the relevant employers being responsible for their management. The Bank is responsible for around 92.4% of the Group’s defined benefit obligation as of December 31, 2017, and expects to make contributions to the plans amounting to 125,818 million Won during the year ended December 31, 2018. The expected contribution is calculated by actuaries based on prudent assessments of the amounts needed to fund the plans in accordance with local regulations.

F-101

(6) The analysis for the maturity, which is not discounted, of the defined benefit obligation of the Bank based on current wages is as following(Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Less than 1 year		48,132		53,718
1 year ~ less than 2 years		60,316		70,962
2 years ~ less than 5 years		159,238		156,561
5 years ~ less than 10 years		214,650		258,642
More than 10 years		436,417		449,738

As of December 31, 2017, the estimated average period until the commencement of payment is around 12.7 years.

(7) Current service cost, net interest expense (income), past service cost, loss (gain) on the curtailment or settlement, and loss (gain) due to remeasurements recognized in the consolidated statements of net income and total comprehensive income are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Current service cost		132,710			153,660			146,750
Net interest income		(588	)		(712	)		(3,972	)
Gain (loss) on the curtailment or settlement		9			(339	)		124
Cost recognized in net income		132,131			152,609			142,902
Remeasurements(*)		103,174			(45,098	)		(6,264	)
Cost recognized in total comprehensive income		235,305			107,511			136,638

(*) This is an amount before considering the tax effects.

Recognized retirement benefit service costs related to defined contribution plans are 3,623 million Won, 3,747 million Won and 3,946 million Won for the years ended December 31, 2015, 2016 and 2017, respectively.

(8) Key actuarial assumptions used in defined benefit liability assessment are as follows:

	December 31, 2015	December 31, 2016	December 31, 2017
Discount rate	2.83%	2.85%	3.18%
Future wage growth rate	6.35%	6.05%	6.18%
Retirement rate	Experience rate for each employment classification	Experience rate for each employment classification	Experience rate for each employment classification
Mortality rate	Issued by Korea Insurance Development Institute	Issued by Korea Insurance Development Institute	Issued by Korea Insurance Development Institute

(9) The sensitivity to actuarial assumptions used in the assessment of defined benefit obligation is as follows (Unit: Korean Won in millions):

		Change of defined benefit obligation as of
		December 31, 2016			December 31, 2017
Discount rate	Increase by 1% point		(107,203	)		(116,405	)
	Decrease by 1% point		125,395			137,151
Future wage growth rate	Increase by 1% point		124,766			136,707
	Decrease by 1% point		(108,344	)		(117,765	)

F-102

25. OTHER FINANCIAL LIABILITIES AND OTHER LIABILITIES

Other financial liabilities and other liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Other financial liabilities:
Account payable		5,626,661			4,692,320
Accrued expenses		2,055,936			2,049,861
Borrowings from trust accounts		3,329,683			3,271,817
Agency business revenue		331,159			344,591
Foreign exchange payables		702,968			590,667
Domestic exchange payables		8,480,765			1,309,646
Other miscellaneous financial liabilities		1,458,747			1,635,156
Present value discount		(833	)		(1,597	)
Sub-total		21,985,086			13,892,461
Other liabilities:
Unearned Income		171,050			180,664
Other miscellaneous liabilities		128,326			103,317
Sub-total		299,376			283,981
Total		22,284,462			14,176,442

26. DERIVATIVES

(1) Derivative assets and derivative liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016
			Assets				Liabilities
	Notional amount		Fair value hedge		For trading		Fair value hedge		For trading
Interest rate:
Futures		54,785		—		—		—		—
Swaps		118,582,511		139,832		470,057		7,013		509,686
Purchase options		860,000		—		21,172		—		—
Written options		1,035,000		—		—		—		21,863
Currency:
Futures		493,733		—		—		—		—
Forwards		62,539,094		—		1,265,852		—		1,015,380
Swaps		39,782,049		—		1,022,969		—		1,221,959
Purchase options		1,120,949		—		42,126		—		—
Written options		907,211		—		—		—		8,589
Equity:
Futures		926,392		—		—		—		—
Swaps		15,000		—		92		—		88
Purchase options		3,007,969		745		73,261		—		—
Written options		4,460,233		—		—		208		228,900
Others:
Futures		5,105		—		—		—		—
Swaps		7,918		—		2,645		—		2,331
Purchase options		8,307		—		121		—		—
Written options		64,352		—		—		—		1,181
Total		233,870,608		140,577		2,898,295		7,221		3,009,977

F-103

	December 31, 2017
			Assets						Liabilities
	Nominal amount		For cash flow hedge		For fair value hedge		For trading		For cash flow hedge		For fair value hedge		For trading
Interest rate:
Futures		75,845		—		—		—		—		—		—
Swaps		130,197,378		—		59,272		223,935		—		12,103		253,972
Purchase options		630,000		—		—		12,346		—		—		—
Written options		795,000		—		—		—		—		—		12,869
Currency:
Futures		318,217		—		—		—		—		—		—
Forwards		72,526,956		—		—		1,314,369		—		—		1,375,799
Swaps		48,176,306		—		—		1,352,924		55,651		—		1,347,905
Purchase options		2,291,154		—		—		64,267		—		—		—
Written options		4,038,237		—		—		—		—		—		58,687
Equity:
Futures		91,436		—		—		—		—		—		—
Swaps		15,000		—		—		103		—		—		10
Purchase options		5,060,706		—		—		146,775		—		—		—
Written options		4,504,290		—		—		—		—		—		99,770
Others:
Futures		—		—		—		—		—		—		—
Swaps		7,805		—		—		1,056		—		—		1,037
Purchase options		—		—		—		—		—		—		—
Written options		5,000		—		—		—		—		—		100
Total		268,733,330		—		59,272		3,115,775		55,651		12,103		3,150,149

Derivatives held for trading purpose are classified into financial assets or liabilities at FVTPL (see Notes 7 and 20) and derivatives for hedging are stated as a separate line item in the consolidated statements of financial position.

(2) Gains or losses from valuation of financial instruments under hedge accounting are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Gains or losses from hedged items		(31,297	)		98,827			110,152
Gains or losses from hedging instruments		38,021			(98,851	)		(109,447	)

The maximum period that the Group is exposed to cash flow risk arising from the hedging transaction discussed above will be terminated by February 2021.

Among gain (loss) on valuation of derivatives that was included in the accumulated other comprehensive income, 56,676 million Won has been reclassified to loss, before reduction of income tax effect for the year ended December 31, 2017.

F-104

27. DEFERRED DAY 1 PROFIT OR LOSS

Changes in details of deferred day 1 profits or losses are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		13,499			28,008			13,422
Acquisitions		26,762			1,337			500
Amounts recognized in profits or losses		(12,253	)		(15,923	)		(6,506	)
Ending balance		28,008			13,422			7,416

In case some variables to measure fair values of financial instruments were not observable or available in the market, valuation techniques were utilized to evaluate such financial instruments. Those financial instruments were recorded at the fair value produced by the valuation techniques as at the time of acquisition, even though there were difference noted between the transaction price and the fair value. The table above presents the difference yet to be realized as profit or losses.

28. CAPITAL STOCK AND CAPITAL SURPLUS

(1) The number of authorized shares and others are as follows:

	December 31, 2016	December 31, 2017
Authorized shares of common stock	5,000,000,000 Shares	5,000,000,000 Shares
Par value	5,000 Won	5,000 Won
Issued shares of common stock	676,000,000 Shares	676,000,000 Shares
Capital stock	3,381,392 million Won	3,381,392 million Won

(2) Changes in numbers of issued shares of common stock are as follows (Unit: Shares):

	December 31, 2015			December 31, 2016		December 31, 2017
Beginning balance		676,278,371			676,000,000		676,000,000
Retirement of treasury stock		(278,371	)		—		—
Ending balance		676,000,000			676,000,000		676,000,000

(3) Details of capital surplus are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Capital in excess of par value		269,533		269,533
Other capital surplus		16,798		16,347
Total		286,331		285,880

F-105

29. HYBRID SECURITIES

The bond-type hybrid securities classified as owner’s equity are as follows (Unit: Korean Won in millions):

	Issue date	Maturity	Interest rate (%)		December 31, 2016			December 31, 2017
Securities in local currency	June 20, 2008	June 20, 2038		7.7		255,000			255,000
	March 8, 2012	March 8, 2042		5.8		190,000			—
	April 25, 2013	April 25, 2043		4.4		500,000			500,000
	November 13, 2013	November 13, 2043		5.7		200,000			200,000
	December 12, 2014	December 12, 2044		5.2		160,000			160,000
	June 3, 2015	June 3, 2045		4.4		240,000			240,000
Securities in foreign currencies	May 2, 2007	May 2, 2037		6.2		930,900			—
	June 10, 2015	June 10, 2045		5.0		559,650			559,650
	September 27, 2016	—		4.5		553,450			553,450
	May 16, 2017	—		5.3		—			562,700
Issuance cost						(14,104	)		(12,912	)
Total						3,574,896			3,017,888

The hybrid securities mentioned above are either without a maturity date or its maturity can be extended indefinitely at the maturity date without change of terms. Further, if a resolution is passed not to pay dividends on common stock, interest payments on the hybrid securities may be skipped.

30. OTHER EQUITY

(1) Details of other equity are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Other comprehensive income:
Gain on valuation of AFS financial assets		386,981			301,930
Share of other comprehensive loss of joint ventures and associates		(1,863	)		(1,251	)
Loss on foreign currencies translation for foreign operations		(48,353	)		(242,700	)
Remeasurement of the net defined benefit liability		(163,397	)		(152,624	)
Gain on valuation of cash flow hedges		—			777
Equity related to current assets held for sale		—			4,145
Sub-total		173,368			(89,723	)
Treasury shares		(34,113	)		(34,113	)
Other capital adjustments		(1,607,280	)		(1,815,438	)
Total		(1,468,025	)		(1,939,274	)

F-106

(2) Changes in the accumulated other comprehensive income are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Beginning balance			Increase (decrease) on valuation			Reclassification(*)			Income tax effect			Ending balance
Gain (loss) on valuation of available-for-sale financial assets		300,994			190,842			(101,439	)		(15,712	)		374,685
Share of other comprehensive income (loss) of joint ventures and associates		2,779			4,409			—			(1,114	)		6,074
Gain (loss) on foreign currency translation of foreign operations		(107,721	)		49,421			—			(12,489	)		(70,789	)
Remeasurement of the net defined benefit liability		(119,375	)		(102,467	)		—			24,263			(197,579	)
Loss on valuation of cash flow hedges		(10,371	)		—			—			—			(10,371	)
Total		66,306			142,205			(101,439	)		(5,052	)		102,020

	For the year ended December 31, 2016
	Beginning balance			Increase (decrease) on valuation			Reclassification(*)			Income tax effect			Ending balance
Gain (loss) on valuation of available-for-sale financial assets		374,685			114,617			(101,647	)		(674	)		386,981
Share of other comprehensive income (loss) of joint ventures and associates		6,074			(9,274	)		—			1,337			(1,863	)
Gain (loss) on foreign currency translation of foreign operations		(70,789	)		30,368			—			(7,932	)		(48,353	)
Remeasurement of the net defined benefit liability		(197,579	)		45,096			—			(10,914	)		(163,397	)
Gain (loss) on valuation of cash flow hedges		(10,371	)		10,371			—			—			—
Total		102,020			191,178			(101,647	)		(18,183	)		173,368

	For the year ended December 31, 2017
	Beginning balance			Increase (decrease) on valuation			Reclassification(*)			Income tax effect			Ending balance
Gain (loss) on valuation of available-for-sale financial assets		386,981			80,997			(164,803	)		(1,245	)		301,930
Share of other comprehensive income (loss) of joint ventures and associates		(1,863	)		2,516			—			(1,904	)		(1,251	)
Loss on foreign currency translation of foreign operations		(48,353	)		(193,272	)		—			(1,075	)		(242,700	)
Remeasurement gain (loss) related to defined benefit plan		(163,397	)		6,216			—			4,557			(152,624	)
Gain (loss) on valuation of cash flow hedges		—			1,025			—			(248	)		777
Transfer to non-current assets held for sale		—			4,145			—			—			4,145
Total		173,368			(98,373	)		(164,803	)		85			(89,723	)

(*) For the change in gain (loss) on valuation of AFS financial assets, “reclassification” is disposal or recognition of impairment losses on AFS financial assets.

F-107

31. RETAINED EARNINGS

(1) Details of retained earnings are as follows (Unit: Korean Won in millions):

		December 31, 2016		December 31, 2017
Legal reserve	Earned surplus reserve		1,622,754		1,729,754
	Other legal reserve		44,634		45,668
	Sub-total		1,667,388		1,775,422
Voluntary reserve	Business rationalisation reserve		8,000		8,000
	Reserve for financial structure improvement		235,400		235,400
	Additional reserve		7,073,104		7,418,806
	Regulatory reserve for credit loss		2,255,252		2,438,191
	Revaluation reserve		753,908		751,964
	Other voluntary reserve		11,700		11,700
	Sub-total		10,337,364		10,864,061
Retained earnings before appropriation			2,606,814		2,980,523
	Total		14,611,566		15,620,006

i. Legal reserve

In accordance with the Banking Act, legal reserve are appropriated at least one tenth of the earnings after tax on every dividend declaration, not exceeding the paid in capital. This reserve may not be used other than for offsetting a deficit or transferring to capital.

ii. Other legal reserve

Other legal reserves are appropriated in the branches located in Japan, Vietnam and Bangladesh according to the banking laws of Japan, Vietnam and Bangladesh, respectively, and may be used to offset any deficit incurred in those branches.

iii. Business rationalization reserve

Pursuant to the Restriction of Special Taxation Act, the Group was previously required to appropriate, as a reserve for business rationalization, amounts equal to tax reductions arising from tax exemptions and tax credits up to December 31, 2001. The requirement was no longer effective from 2002.

iv. Reserve for financial structure improvement

From 2002 to 2014, the Finance Supervisory Services recommended banks in Korea to appropriate at least ten percent of net income after accumulated deficit for financial structure improvement, until tangible common equity ratio equals 5.5 percent. But this reserve is not available for payment of cash dividends; however, it can be used to reduce a deficit or be transferred to capital. Since 2015, reservation and appropriation became an autonomous judgment matter of the Group.

v. Additional reserve and other voluntary reserve

Both of Additional reserve and other voluntary reserve are appropriated for capital adequacy and other management purpose.

F-108

vi. Regulatory reserve for credit loss

In accordance with Article 29 of the Regulation on Supervision of Banking Business (“RSBB”), if provisions for credit losses under IFRS for the accounting purpose are lower than provisions under RSBB, the Group discloses such shortfall amount as regulatory reserve for credit loss.

vii. Revaluation reserve

Revaluation reserve is the amount of limited dividends set by the board of directors to be the recognized as complementary capital when the gain or loss occurred in the property revaluation by adopting IFRS.

(2) Changes in retained earnings are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Beginning balance		14,165,358			13,726,122			14,611,566
Net income attributable to owners		1,059,157			1,261,266			1,512,148
Dividends on common stock		(504,952	)		(168,317	)		(336,636	)
Dividends on hybrid securities		(183,320	)		(206,515	)		(167,072	)
Appreciation of merger losses		(806,640	)		—			—
Repayment of hybrid securities		—			(990	)		—
Retirement of treasury stock		(3,481	)		—			—
Ending balance		13,726,122			14,611,566			15,620,006

32. REGULATORY RESERVE FOR CREDIT LOSS

In accordance with Paragraph 1 and 2 of Article 29 of the Regulation on Supervision of Banking Business (“RSBB”), if the estimated provisions for credit loss under IFRS for the accounting purpose are lower than those in accordance with the provisions under the RSBB, the Group shall disclose the difference as the planned regulatory reserve for credit loss.

(1) Balance of the planned regulatory reserve for credit loss is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2016		2017
Beginning balance		2,255,252		2,438,191
Planned provision of regulatory reserve for credit loss		182,939		140,266
Ending balance		2,438,191		2,578,457

(2) Planned reserves provided, adjusted net income after the planned reserves provided and adjusted earnings per share after the planned reserves provided are as follows (Unit: Korean Won in millions, except for earnings per share amount):

	For the years ended December 31
	2015		2016		2017
Net income		1,075,392		1,277,533		1,530,088
Provision of regulatory reserve for credit loss		499,110		182,939		140,266
Adjusted net income after the provision of regulatory reserve		576,282		1,094,594		1,389,822
Adjusted EPS after the provision of regulatory reserve (Unit: Korean Won)		584		1,320		1,817

F-109

33. DIVIDENDS

The Group’s dividends for the year ended December 31, 2016 and 2017 are 400 Won and 500 Won per share, respectively, and the total dividend amount to 269,308 million Won and 336,636 million Won, respectively. The Group paid out 67,328 million Won (100 Won per share) as an interim dividend during the year ended December 31, 2017. Meanwhile, the dividend for 2017 was approved on 23 March 2018.

34. NET INTEREST INCOME

(1) Interest income recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Financial assets at FVTPL		63,143		63,408		53,348
AFS financial assets		389,443		339,518		239,030
HTM financial assets		418,065		360,054		307,965
Loans and receivables:
Interest on due from banks		81,117		75,021		83,325
Interest on loans		7,700,475		7,635,791		7,835,957
Interest of other receivables		45,992		38,520		31,062
Sub-total		7,827,584		7,749,332		7,950,344
Total		8,698,235		8,512,312		8,550,687

(2) Interest expense recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Interest on deposits due to customers		2,888,529		2,547,142		2,380,263
Interest on borrowings		216,743		215,240		238,212
Interest on debentures		707,772		619,255		638,653
Interest expense on others		123,291		111,131		72,909
Total		3,936,335		3,492,768		3,330,037

35. NET FEES AND COMMISSIONS INCOME

(1) Fees and commissions income recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Banking fees(*)		676,114		660,556		673,582
Guarantee fees		78,922		66,549		65,779
Fees from project financing		15,521		20,213		13,394
Credit card fees		852,250		954,502		1,072,423
Brokerage fees		67,692		70,928		80,872
Others		66,841		92,722		163,148
Total		1,757,340		1,865,470		2,069,198

(*) Banking fees include agency commission, fees income from electronic finance, fees income related to loan, fees for import letter of credit dealing, commission received on foreign exchange and others.

F-110

(2) Fees and commissions expense incurred is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Fees paid		133,909		162,170		164,834
Credit card commissions		643,524		760,913		828,363
Brokerage commissions		615		739		558
Others		2,496		4,517		4,977
Total		780,544		928,339		998,732

36. DIVIDEND INCOME

Dividend income recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Dividend from financial assets at FVTPL		1,217		996		446
Dividend from AFS financial assets		101,706		183,514		124,546
Total		102,923		184,510		124,992

37. GAINS (LOSSES) ON FINANCIAL ASSETS AT FVTPL

(1) Details of gains or losses related to financial assets at FVTPL are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016			2017
Gains on financial assets held for trading		171,137		185,786			6,123
Gains (losses) of financial assets designated at FVTPL		69,205		(71,399	)		(110,950	)
Total		240,342		114,387			(104,827	)

F-111

(2) Gains (losses) on financial assets held for trading are as follows (Unit: Korean Won in millions):

			For the years ended December 31
			2015			2016			2017
Financial Assets at FVTPL	Securities	Gain on valuation		7,735			9,323			2,764
		Gain on disposals		32,780			24,509			20,528
		Loss on valuation		(13,663	)		(12,681	)		(13,757	)
		Loss on disposals		(22,771	)		(11,524	)		(6,466	)
		Sub-total		4,081			9,627			3,069
	Other financial assets	Gain on valuation		10,195			13,628			6,524
		Gain on disposals		442			2,404			2,353
		Loss on valuation		(10,189	)		(14,033	)		(7,885	)
		Loss on disposals		(208	)		(1,644	)		(619	)
		Sub-total		240			355			373
	Total			4,321			9,982			3,442
Derivatives (for trading)	Interest rates derivatives	Gain on transactions and valuation		1,240,353			1,423,606			1,088,192
		Loss on transactions and valuation		(1,251,673	)		(1,401,582	)		(1,043,312	)
		Sub-total		(11,320	)		22,024			44,880
	Currencies derivatives	Gain on transactions and valuation		4,241,317			5,804,420			7,253,426
		Loss on transactions and valuation		(3,987,856	)		(5,683,357	)		(7,408,741	)
		Sub-total		253,461			121,063			(155,315	)
	Equity derivatives	Gain on transactions and valuation		92,400			293,657			511,220
		Loss on transactions and valuation		(166,528	)		(259,280	)		(397,462	)
		Sub-total		(74,128	)		34,377			113,758
	Other derivatives	Gain on transactions and valuation		54,322			50,139			4,056
		Loss on transactions and valuation		(55,519	)		(51,799	)		(4,698	)
		Sub-total		(1,197	)		(1,660	)		(642	)
	Total			166,816			175,804			2,681
	Total			171,137			185,786			6,123

F-112

(3) Gains (losses) on financial assets designated at FVTPL are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Gain (loss) on equity-linked securities:
Gain (loss) on disposals of equity-linked securities		(22,363	)		(24,165	)		(79,965	)
Gain (loss) on valuation of equity-linked securities		89,863			(52,007	)		(32,511	)
Sub-total		67,500			(76,172	)		(112,476	)
Gain (loss) on securities:
Gain (loss) on disposals of securities		(62	)		14			—
Gain on valuation of securities		1,027			882			290
Sub-total		965			896			290
Gain on other financial instruments:
Gain on valuation of other financial instruments		740			3,877			1,236
Total		69,205			(71,399	)		(110,950	)

38. NET LOSSES ON AFS FINANCIAL ASSETS

Gains (losses) on AFS financial are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Gains on redemption of securities		1,089			721			47
Gains on transaction of securities		130,457			47,985			223,961
Impairment losses on securities		(134,827	)		(49,741	)		(31,300	)
Total		(3,281	)		(1,035	)		192,708

39. IMPAIRMENT LOSSES DUE TO CREDIT LOSS

Impairment losses on loans and receivables, guarantees and loan commitment recognized for credit loss are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Provision due to credit loss		(1,112,139	)		(890,763	)		(862,273	)
Reversal of provision on/(provision for) guarantees		140,318			59,780			55,424
Reversal of provision on/(provision for) loan commitment		5,175			(3,093	)		21,716
Total		(966,646	)		(834,076	)		(785,133	)

F-113

40. GENERAL, ADMINISTRATIVE, AND OTHER NET OPERATING INCOMES (EXPENSES)

(1) Administrative expenses recognized are as follows (Unit: Korean Won in millions):

			For the years ended December 31
			2015		2016		2017
Employee benefits	Short term	Salaries		1,262,786		1,323,007		1,317,826
	employee benefits	Others		381,283		466,585		559,562
	Retirement benefit service costs(*)			135,754		156,356		146,848
	Termination			73,119		179,286		299,562
	Sub-total			1,852,942		2,125,234		2,323,798
Depreciation and amortization				236,958		248,269		183,601
Other general and administrative expenses	Rent			295,871		311,992		313,080
	Taxes and dues			103,580		102,531		111,248
	Service charges			233,860		244,543		198,828
	IT expenses			100,026		83,978		70,936
	Telephone and communication expenses			60,880		63,699		65,015
	Operating promotion expenses			46,638		48,115		43,850
	Advertising			58,914		76,153		68,942
	Printing			10,249		9,502		8,633
	Traveling expenses			9,601		11,681		13,064
	Supplies			6,822		6,827		6,795
	Insurance premium			7,236		8,092		8,548
	Reimbursement			23,779		26,846		27,516
	Maintenance			14,565		16,470		16,081
	Water, light and heating			15,205		15,006		14,165
	Vehicle maintenance			10,400		9,987		9,902
	Others			62,861		69,551		46,799
	Sub-total			1,060,487		1,104,973		1,023,402
	Total			3,150,387		3,478,476		3,530,801

(*) This includes the amount the Group paid for the Defined Contribution type pension plan of 3,946 million Won in addition to the expenses related to the Defined Benefit type pension plan of 142,902 million Won for the year ended December 31, 2017. For the details, please see Note 24 (7).

(2) Other operating incomes recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Gains on transaction of foreign exchange		3,352,318		4,791,772		3,391,095
Gains on disposal of loans and receivables		186,939		204,239		205,490
Gains on transactions of derivatives		59,003		130		122
Gains on fair value hedged items		25,235		99,302		53,532
Others(*)		158,806		112,079		86,159
Total		3,782,301		5,207,522		3,736,398

(*) Others include such incomes amounting to 137,187 million Won, 74,700 million Won and 29,336 million Won for the year ended December, 2015, 2016 and 2017, respectively, that the Group recognized for it is to receive from other creditor financial institutions in accordance with the creditor financial institutions committee agreement.

F-114

(3) Other operating expenses recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Losses on transaction of foreign exchange		3,429,638		4,706,055		2,886,535
KDIC deposit insurance fees		266,031		298,804		304,055
Contribution to miscellaneous funds		343,703		295,601		286,000
Losses on disposal of loans and receivables		43,266		4,265		9,221
Losses related to derivatives		20,982		98,981		109,569
Losses on fair value hedged items		56,532		475		—
Others(*)		232,210		171,120		172,331
Total		4,392,362		5,575,301		3,767,711

(*) Others include such expenses amounting to 154,897 million Won, 109,063 million Won and 5,237 million Won for the year ended December 31, 2015, 2016 and 2017, respectively, that the Group recognized for it is to carry out a payment to other creditor financial institutions in accordance with the creditor financial institutions committee agreement. In addition, other expense for the year ended December 31, 2017 includes 48,292 million Won of intangible asset amortization expense.

41. OTHER NET NON-OPERATING INCOME

(1) Details of gain or loss on valuation of investments in joint ventures and associates are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Gain on valuation		41,363			36,757			83,506
Loss on valuation		(55,176	)		(55,091	)		(70,117	)
Impairment loss		(56,311	)		(1,173	)		(114,903	)
Total		(70,124	)		(19,507	)		(101,514	)

(2) Other non-operating income and expense recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Other non-operating income		272,610			132,272			84,361
Other non-operating expense		(102,126	)		(133,582	)		(190,083	)
Total		170,484			(1,310	)		(105,722	)

(3) Other non-operating incomes recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Rental fee income		8,225		7,291		6,973
Gains on disposal of investment in joint ventures and associates		61,653		23,457		39,932
Gains on disposal of premises and equipment and other assets		6,814		1,885		5,028
Reversal of impairment loss on premises and equipment and other assets		539		3,581		666
Others(*)		195,379		96,058		31,762
Total		272,610		132,272		84,361

F-115

(*) Others include the receipt of guaranteed payment, which was amounting to 132,784 million Won, during the year ended December 31, 2015 that the Group received in accordance with the final irrevocable verdict for the payment of commitment (Note 44).

(4) Other non-operating expenses recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Depreciation on investment properties		3,806		3,762		3,902
Interest expenses of rent leasehold deposits		688		496		459
Losses on disposal of investment in joint ventures and associates		10		15,060		38,713
Losses on disposal of premises and equipment and other assets		2,707		9,718		9,994
Impairment losses on premises and equipment and other assets		2,990		1,936		390
Donation		46,266		43,939		98,132
Others		45,659		58,671		38,493
Total		102,126		133,582		190,083

42. INCOME TAX EXPENSE

(1) Income tax expenses are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Current tax expense
Current tax expense in respect of the current year		362,552			332,996			471,669
Adjustments recognized in the current period in relation to the current tax of prior periods		(27,038	)		(22,138	)		(5,209	)
Sub-total		335,514			310,858			466,460
Deferred tax expense
Deferred tax expense (benefit) relating to the origination and reversal of temporary differences		44,884			(18,766	)		(47,464	)
Less: Deferred tax charged directly to other comprehensive income		(3,844	)		(16,236	)		422
Sub-total		41,040			(35,002	)		(47,042	)
Income tax expense		376,554			275,856			419,418

F-116

(2) Income tax expense (benefit) can be reconciled to net income (loss) before income tax expense as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Net income before income tax expense		1,451,946			1,553,389			1,949,506
Income from continuing operations before income tax		1,451,946			1,553,389			1,949,506
Tax calculated at statutory tax rate(*)		350,909			375,458			471,318
Adjustments
Effect of income that is exempt from taxation		(56,247	)		(75,166	)		(55,983	)
Effect of expense that is not deductible in determining taxable profit		50,152			13,664			22,254
Adjustments recognized in the current period in relation to the current tax of prior periods		(27,038	)		(22,138	)		(5,209	)
Effect on deferred tax balances due to the change in income tax rate from 24.2% to 27.5% (effective January 1, 2018)		—			—			(35,987	)
Others		58,778			(15,962	)		23,025
Sub-total		25,645			(99,602	)		(51,900	)
Income tax expense		376,554			275,856			419,418
Effective tax rate
		25.93	%		17.76	%		21.51	%

(*) Applicable income tax rate; 1) 11% for below 200 million Won, 2) 22% for from 200 million Won to 20 billion Won, 3) 24.2% for above 20 billion Won.

(3) Deferred tax assets and liabilities are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Beginning balance (*1)			Recognized as income (loss)			Recognized as other comprehensive income (loss)			Ending balance
Gain (loss) on financial assets at FVTPL		422,910			22,819			—			445,729
Gain (loss) on available-for-sale financial assets		(105,556	)		94			(16,074	)		(121,536	)
Gain (loss) on valuation using the equity method of accounting		21,156			(14,936	)		(1,114	)		5,106
Gain (loss) on valuation of derivatives		(48,438	)		8,664			—			(39,774	)
Accrued income		(75,094	)		(7,054	)		—			(82,148	)
Allowance for loan loss		(59,428	)		8,924			—			(50,504	)
Loan and receivables written off		6,921			47,304			—			54,225
Loan origination costs and fees		(88,476	)		(15,436	)		—			(103,912	)
Defined benefit liability		151,666			26,912			24,845			203,423
Deposits with employee retirement insurance trust		(135,474	)		(51,570	)		—			(187,044	)
Provision for guarantee		84,530			(15,305	)		—			69,225
Other provision		37,029			(9,131	)		—			27,898
Others		24,355			(42,324	)		(11,501	)		(29,470	)
Net deferred tax assets		236,101			(41,039	)		(3,844	)		191,218

F-117

	For the year ended December 31, 2016
	Beginning balance			Recognized as income (loss)			Recognized as other comprehensive income (loss)			Ending balance
Gain on financial assets at FVTPL		445,729			(18,524	)		—			427,205
Gain (loss) on AFS financial assets		(121,536	)		57			(666	)		(122,145	)
Gain (loss) on valuation using the equity method of accounting		5,106			26,500			1,337			32,943
Gain (loss) on valuation of derivatives		(39,774	)		(4,079	)		—			(43,853	)
Accrued income		(82,148	)		12,188			—			(69,960	)
Provision for loan losses		(50,504	)		3,693			—			(46,811	)
Loan and receivables written off		54,225			(310	)		—			53,915
Loan origination costs and fees		(103,912	)		(4,190	)		—			(108,102	)
Defined benefit liability		203,423			32,536			(10,914	)		225,045
Deposits with employee retirement insurance trust		(187,044	)		(39,277	)		—			(226,321	)
Provision for guarantee		69,225			(28,087	)		—			41,138
Other provision		27,898			4,494			—			32,392
Others		(29,470	)		50,001			(5,993	)		14,538
Net deferred tax assets		191,218			35,002			(16,236	)		209,984

(*1) The beginning balance incorporates the deferred tax assets (liabilities) from subsidiaries that were reclassified into disposal group held for sale and disposal groups held for distribution to owners.

	For the year ended December 31, 2017
	Beginning balance			Recognized as income (expense)			Recognized as other comprehensive income (expense)			Ending balance
Gain on financial assets at FVTPL		427,205			70,996			—			498,201
Gain (loss) on AFS financial assets		(122,145	)		1,011			(1,008	)		(122,142	)
Gain (loss) on valuation using the equity method of accounting		32,943			(6,473	)		(1,904	)		24,566
Gain (loss) on valuation of derivatives		(43,853	)		33,806			(248	)		(10,295	)
Accrued income		(69,960	)		8,972			—			(60,988	)
Provision for loan losses		(46,811	)		(886	)		—			(47,697	)
Loan and receivables written off		53,915			(44,138	)		—			9,777
Loan origination costs and fees		(108,102	)		(29,218	)		—			(137,320	)
Defined benefit liability		225,045			54,533			4,656			284,234
Deposits with employee retirement insurance trust		(226,321	)		(61,012	)		—			(287,333	)
Provision for guarantee		41,138			(10,536	)		—			30,602
Other provision		32,392			12,761			—			45,153
Others(*2)		14,538			17,227			(1,074	)		30,691
Net deferred tax assets		209,984			47,043			422			257,449

(*2) Among the deferred tax assets and liabilities classified as ‘Others,’ the deferred tax asset arising from accumulated deficit amounts to 15,652 million Won.

F-118

(4) Unrecognised temporary differences are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Deductible temporary differences(*)		59,803			126,818
Unused tax losses		192,138			96,135
Taxable temporary differences(*)		(1,263,200	)		(1,298,586	)
Total		(1,011,259	)		(1,075,633	)

(*) The amounts in the tabular disclosure at 31 December 2016 have been restated by (164,649) million Won relating to Deductible temporary differences and (394,659) million Won relating to Taxable temporary differences, respectively, due to an error in the previous year’s disclosure.

(5) Deferred tax charged directly to other comprehensive income is as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Loss on available-for-sale financial assets		(113,161	)		(114,169	)
Share of other comprehensive gain (loss) of jointly controlled entities and associates		950			(954	)
Gain on foreign currency translation of foreign operations		16,930			15,855
Remeasurements		51,661			56,317
Loss on valuation of cash flow hedges		—			(248	)
Total		(43,620	)		(43,199	)

(6) Current tax assets and liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Current tax assets		6,229		4,722
Current tax liabilities		171,192		232,600

(7) Deferred tax assets and liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Deferred tax assets		232,007		280,130
Deferred tax liabilities		22,023		22,681
Net deferred tax assets		209,984		257,449

43. EARNINGS PER SHARE (“EPS”)

Basic EPS is calculated by dividing net income by weighted average number of common shares outstanding (Unit: Korean Won in millions except for EPS and number of shares):

	For the years ended December 31
	2015			2016			2017
Net income attributable to common shareholders		1,059,157			1,261,266			1,512,148
Dividends to hybrid securities		(183,320	)		(206,515	)		(167,072	)
Net income attributable to common shareholders		875,837			1,054,751			1,345,076
Weighted average number of common shares outstanding		673 million shares			673 million shares			673 million shares
Basic Earnings Per Share		1,301			1,567			1,999

F-119

Diluted EPS is equal to basic EPS because there is no dilution effect for the year ended December 31, 2015, 2016 and 2017.

44. CONTINGENT LIABILITIES AND COMMITMENTS

(1) Details of guarantees are as follow (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Confirmed guarantees
Guarantee for loans		79,566		157,299
Acceptances		504,354		320,519
Letters of guarantees		97,606		108,238
Other confirmed guarantees		7,588,661		6,288,965
Total		8,270,187		6,875,021
Unconfirmed guarantees
Local letter of credit		397,588		383,117
Letter of credit		3,844,345		3,637,787
Other unconfirmed guarantees		859,768		505,689
Total		5,101,701		4,526,593
CP purchase commitments and others		1,389,896		1,458,101

(2) Details of loan commitments and others are as follow (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Loan commitments		83,795,496		80,760,325
Other commitments		4,840,593		4,546,090

(3) Litigation case

The Group had filed lawsuits as follows (Unit: Korean Won in millions except for number of cases):

	December 31, 2016				December 31, 2017
	As plaintiff		As defendant		As plaintiff		As defendant
Number of cases		88 cases		175 cases		83 cases		155 cases
Amount of litigation		308,848		246,465		413,267		244,767
Allowance for litigations				5,946				9,277

(4) Other

The Group provides clearance services for payments in Korean Won in order to facilitate trade transactions between Korea and Iran. In connection with these services, the Group is currently being investigated by US government agencies including US prosecutors(United States Attorney’s Office and New York State Attorney General’s Office) as to whether the Group has violated United States laws by participating in prohibited transactions involving countries sanctioned by the US.

F-120

45. RELATED PARTY TRANSACTIONS

Related parties of the Group and assets and liabilities recognized and major transactions with the related parties during the current and prior periods are as follows:

(1) Related parties

Related parties
Associates	Kumho Tires Co., Inc., Woori Service Networks Co., Ltd., Korea Credit Bureau Co., Ltd., Korea Finance Security Co., Ltd., Chin Hung International Inc., Poonglim Industrial Co., Ltd., STX Engine Co., Ltd, STX Corporation, 2016KIF-IMM Woori Bank Technology Venture Fund, K BANK Co., Ltd., Well to Sea No. 3 Private Equity Fund, and Others (Dongwoo C & C Co., Ltd. and other 22 associates)

(2) Assets and liabilities from transactions with related parties are as follows (Unit: Korean Won in millions):

Related party		A title of account	December 31, 2016			December 31, 2017
Corporation that have significant influence over the Group	KDIC(*1)	Loans		9			—
		Other assets		270,041			—
		Deposits due to customers		1,894,631			—
		Other liabilities		15,568			—
Associates	Kumho Tires Co., Inc.	Loans		299,523			170,917
		Allowance for credit loss		(715	)		(156,712	)
		Deposits due to customers		45,957			666
		Other liabilities		50			50
	Woori Blackstone Korea Opportunity Private Equity Fund No.1	Other assets		34			—
		Other liabilities		306			—
	Woori Service Networks Co., Ltd.	Loans		29			45
		Deposits due to customers		2,572			1,311
		Other liabilities		393			357
	Korea Credit Bureau Co., Ltd.	Loans		2			6
		Deposits due to customers		5,069			5,586
		Other liabilities		40			54
	Korea Finance Security Co., Ltd.	Loans		55			56
		Deposits due to customers		2,801			2,854
		Other liabilities		6			7
	Chin Hung International Inc.	Loans		4,320			408
		Allowance for credit loss		(4,287	)		(22	)
		Deposits due to customers		14,047			46,220
		Other liabilities		279			1,658
	Poonglim Industrial Co., Ltd.	Deposits due to customers		283			4

F-121

Related party		A title of account	December 31, 2016			December 31, 2017
	STX Engine Co., Ltd.	Loans		107,974			106,176
		Allowance for credit loss		(89,531	)		(88,734	)
		Deposits due to customers		13,260			18,092
		Other liabilities		588			29
	Samho International Co., Ltd.(*2)	Loans		37,327			—
		Allowance for credit loss		(717	)		—
		Deposits due to customers		82,917			—
		Other liabilities		216			—
	STX Corporation	Loans		144,035			47,711
		Allowance for credit loss		(92,643	)		(31,210	)
		Deposits due to customers		14,412			77,555
		Other liabilities		90			80
	K BANK Co., Ltd.	Loans		—			212
		Other assets		325			—
	Well to Sea No.3 Private Equity Fund(*3)	Loans		—			73,810
		Allowance for credit loss		—			(39	)
		Deposits due to customers		—			61
		Other liabilities		—			27
	Others(*4)	Loans		619			499
		Allowance for credit loss		(253	)		(471	)
		Other assets		8			1
		Deposits due to customers		4,460			2,906
		Other liabilities		60			73

(*1) As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been excluded from the corporation that have significant influence over the Group.

(*2) As the Group sold its entire ownership interest of the entity, it is excluded from the investment in associates during the years ended December 31, 2017.

(*3) Due to capital contribution by the Group during the years ended December 31, 2017, the entity was included in the investment in associates.

(*4) Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2016 and 2017.

F-122

(3) Gain or loss from transactions with related parties are as follows (Unit: Korean Won in millions):

			For the years ended December 31
Related party		A title of account	2015			2016			2017
Corporation that have significant influence over the group	KDIC(*3)	Interest income		22,237			11,778			—
		Interest expenses		23,584			20,966			15,331
		Impairment losses due to credit loss (reversal of allowance for credit loss)		29			—			—
Associates	Kumho Tires Co., Ltd.	Interest income		2,698			2,430			2,641
		Fees income		6			6			5
		Interest expenses		205			68			1
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(2,353	)		162			155,997
	Woori Blackstone Korea Opportunity Private Equity Fund No.1	Fees income		1,437			1,364			6,225
	Woori Service Networks Co., Ltd.	Other income		28			29			30
		Interest expenses		83			49			24
		Fees expenses		821			985			543
		Other expenses		228			222			507
		Impairment losses due to credit loss		2			—			—
	Korea Credit Bureau Co., Ltd.	Interest expenses		74			138			82
		Fees expenses		1,690			1,915			2,079
	Korea Finance Security Co., Ltd.	Interest expenses		39			10			12
		Fees expenses		93			110			—
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(3	)		—			—
	Chin Hung International Inc.	Interest income		807			240			364
		Fees income		1			1			1
		Interest expenses		35			28			27
		Reversal of allowance for credit loss		(534	)		(481	)		(4,265	)
	Poonglim Industrial Co., Ltd.	Interest expenses		11			2			—
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(1,565	)		(1,557	)		—
	Ansang Tech Co., Ltd.(*1)	Reversal of allowance for credit loss		(38	)		—			—
	STX Engine Co., Ltd.	Interest income		1,358			1,348			1,417
		Fees income		67			58			28
		Interest expenses		46			97			147
		Impairment losses due to credit loss		20,524			63,866			(797	)

F-123

			For the years ended December 31
Related party		A title of account	2015			2016			2017
Associates	Samho International Co., Ltd.(*4)	Interest income		1,015			916			486
		Fees income		3			5			5
		Interest expenses		981			525			334
		Reversal of allowance for credit loss		(2,098	)		(5,166	)		(717	)
	Force TEC C Co., Ltd.(*5)	Interest income		249			153			—
		Impairment losses due to credit loss (reversal of allowance for credit loss)		5,900			—			—
	Hana Engineering & Construction Co., Ltd.(*2)	Reversal of allowance for credit loss		(98	)		—			—
	STX Corporation	Interest income		1,729			1,039			219
		Fees income		89			75			30
		Interest expenses		6			7			4
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(4,060	)		73,457			(61,432	)
	Osung LST Co., Ltd.(*2)	Interest income		226			170			—
		Interest expenses		16			1			—
		Reversal of allowance for credit loss		(223	)		(338	)		—
	Woori Columbus 1st Private Equity Fund	Fees income		546			308			272
	Ilyang Construction Co., Ltd.(*2)	Impairment losses due to credit loss		215			—			—
	K BANK Co., Ltd.(*6)	Fees income		—			296			—
		Other income		—			1,638			1,051
	Well to Sea No.3	Interest incomes		—			—			982
	Private Equity Fund(*7)	Interest expenses		—			—			4
		Impairment losses due to credit loss		—			—			39
	Others(*8)	Interest expenses		—			17			13
		Impairment losses due to credit loss		—			253			218

(*1) As the Group sold its ownership interests in the entities during the year ended December 31, 2015, these entities were excluded from the investment in associates.

(*2) As the Group sold its ownership interests in the entities during the year ended December 31, 2016, these entities were excluded from the investment in associates.

(*3) As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been exclude from the corporation that have significant influence over the Group.

(*4) As the Group sold its entire ownership interest of the entity, it is excluded from the investment in associates during the years ended December 31, 2017.

F-124

(*5) The entity is not in scope for the associates as of December 31, 2017, because the Group does not have significant influence over the entity due to the fact that it is going through workout process under receivership.

(*6) Due to capital contribution during the year ended December 31, 2016, the entity has been included in the investment in associates.

(*7) Due to capital contribution by the Group during the year ended December 31, 2017, the entity was included in the investment in associates.

(*8) Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2017, and Saman Corporation, Kyesan Engineering Co., Ltd., Gachi Staff Co., Ltd., QTS Shipping Co., Ltd., and others were included as of December 31, 2016, respectively.

(4) Guarantees provided to the related parties are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
KDIC(*1)		1,500,000		—	Loan commitment
Kumho Tires Co., Inc.		24,187		4,181	Letter of credit and others
		126,435		636	Loan commitment
Korea Finance Security Co., Ltd.		205		204	Loan commitment
Korea Credit Bureau Co., Ltd.		33		29	Loan commitment
Woori Service Networks Co., Ltd.		171		155	Loan commitment
Chin Hung International Inc.		40,904		31,891	Loan commitment
STX Engine Co., Ltd.		63,103		68,858	Letter of credit and others
		685		—	Loan commitment
SamHo Co., Ltd.(*2)		30,083		—	Loan commitment
STX corporation		24,316		17,557	Letter of credit and others
		71		53	Loan commitment
Well to Sea No.3 Private Equity Fund(*3)		—		236,190	Loan commitment

(*1) As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been exclude from the corporation that have significant influence over the Group.

(*2) As the Group sold its entire ownership interest of the entities during the year ended December 31, 2017, they are excluded from the investment in associates.

(*3) Due to capital contribution by the Group during the year ended December 31, 2017, the entity was included in the investment in associates.

For the guarantee provided to the related parties, the Group recognized provisions for guarantees amounting to 70,587 million Won and 71,459 million Won, as of December 31, 2016 and 2017, respectively.

(5) Compensation for key management is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015(*)		2016		2017
Short term benefits		10,288		9,523		12,024
Severance payments		473		424		472
Total		10,761		9,947		12,496

(*) As the scope of the compensation for key management disclosure has changed, the comparative amounts are restated.

F-125

Key management includes registered executives and non-registered executives. Outstanding assets and liabilities from transactions with key management amount to 2,439 million Won and 6,309 million Won, respectively, as of December 31, 2017. With respect to the assets, the Group has not recognized any allowance, nor provision.

46. BUSINESS COMBINATION

(1) Acquisition of Woori Wealth Bank in Philippines in 2016

The Group acquired 51% interest ownership in Wealth Development Bank, a savings bank in Philippines, in October 2016. As the residual shares of 49% is owned by Viscal group, which operates retail businesses, the Group plans to expand its business operation through retail channels of Viscal group.

(2) Establishment of Woori Bank Vietnam Limited in 2016

The Group established Woori Bank Vietnam (capitalized at 3 trillion VND) in October 2016, upon the approval from Vietnam Central Bank and commenced its operation on January 3, 2017. The Group has been operating two branches in Hanoi and Ho Chi Minh, and newly established the subsidiary in order for further expansion of its retail banking business in Vietnam.

(3) Acquisition accounting in 2016 (Unit: Korean Won in millions)

	Woori Wealth Bank in Philippines		Woori Bank Vietnam Limited		Total
I. Consideration
Cash and cash equivalents		25,675		155,400		181,075
II. Identifiable assets and liabilities
Cash and Cash equivalents		48,774		—		48,774
AFS financial assets		2,125		—		2,125
Loan and receivables		126,917		155,400		282,317
Property and equipment		651		—		651
Intangible assets		205		—		205
Other assets		8,792		—		8,792
Sub-total		187,464		155,400		342,864
Deposits		148,521		—		148,521
Allowance for credit losses		352		—		352
Other liabilities		3,655		—		3,655
Sub-total		152,528		—		152,528
Fair value of identifiable net asset		34,936		155,400		190,336
III. Non-controlling interest		17,118		—		17,118
IV. Goodwill		7,857		—		7,857

47. SUBSEQUENT EVENTS

There have been no significant events between December 31, 2017 and the date of issuance of these consolidated financial statements which would require a change to or additional disclosure in the accounts.

F-126

EX-12.1

Exhibit 12.1(a)

I, Tae-Seung Sohn, certify that:

1. I have reviewed this annual report on Form 20-F of Woori Bank;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;

4. The company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the company’s internal control over financial reporting that occurred during the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, the company’s internal control over financial reporting; and

5. The company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of the company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal control over financial reporting.

Date: April 30, 2018

/s/    Tae-Seung Sohn

Tae-Seung Sohn

President and Chief Executive Officer

Exhibit 12.1(b)

I, Won-Duk Lee, certify that:

1. I have reviewed this annual report on Form 20-F of Woori Bank;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;

4. The company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the company’s internal control over financial reporting that occurred during the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, the company’s internal control over financial reporting; and

5. The company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of the company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal control over financial reporting.

Date: April 30, 2018

/s/    Won-Duk Lee

Won-Duk Lee

Managing Director and Principal Financial Officer

EX-13.1

Exhibit 13.1(a)

Certification

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Subsection (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)

Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsection (a) and (b) of section 1350, chapter 63 of title 18, United States Code), the undersigned officer of Woori Bank, a corporation organized under the laws of the Republic of Korea (the “Bank”), does hereby certify, to such officer’s knowledge, that:

The annual report on Form 20-F for the year ended December 31, 2017 (the “Form 20-F”) fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in the Form 20-F fairly presents, in all material respects, the financial condition and results of operation of the Bank.

Dated: April 30, 2018	/s/    Tae-Seung Sohn
	Tae-Seung Sohn
	President and Chief Executive Officer

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Woori Bank and will be retained by Woori Bank and furnished to the U.S. Securities and Exchange Commission or its staff upon request.

Exhibit 13.1(b)

Certification

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Subsection (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)

Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsection (a) and (b) of section 1350, chapter 63 of title 18, United States Code), the undersigned officer of Woori Bank, a corporation organized under the laws of the Republic of Korea (the “Bank”), does hereby certify, to such officer’s knowledge, that:

The annual report on Form 20-F for the year ended December 31, 2017 (the “Form 20-F”) fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in the Form 20-F fairly presents, in all material respects, the financial condition and results of operation of the Bank.

Dated: April 30, 2018	/s/    Won-Duk Lee
	Won-Duk Lee
	Managing Director and Principal Financial Officer

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Woori Bank and will be retained by Woori Bank and furnished to the U.S. Securities and Exchange Commission or its staff upon request.

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Document and Entity Information	12 Months Ended
	Dec. 31, 2017 shares
Document and entity information [Abstract]
Entity Registrant Name	Woori Bank
Entity Central Index Key	0001264136
Document Type	20-F
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	676,000,000

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Consolidated Statements Of Financial Position	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
ASSETS [Abstract]
Cash and cash equivalents	₩ 6,908,286,000,000	$ 6,471,947,000	₩ 7,591,324,000,000
Financial assets at fair value through profit or loss	5,843,077,000,000	5,474,019,000	5,650,724,000,000
Available-for-sale financial assets	15,352,950,000,000	14,383,232,000	20,817,583,000,000
Held-to-maturity financial assets	16,749,296,000,000	15,691,383,000	13,910,251,000,000
Loans and receivables	267,106,204,000,000	250,235,337,000	258,392,633,000,000
Investments in joint ventures and associates	417,051,000,000	390,709,000	439,012,000,000
Investment properties	371,301,000,000	347,849,000	358,497,000,000
Premises and equipments	2,477,545,000,000	2,321,059,000	2,458,025,000,000
Intangible assets and goodwill	518,599,000,000	485,844,000	483,739,000,000
Assets held for sale	48,624,000,000	45,553,000	2,342,000,000
Current tax assets	4,722,000,000	4,424,000	6,229,000,000
Deferred tax assets	280,130,000,000	262,436,000	232,007,000,000
Derivative assets	59,272,000,000	55,529,000	140,577,000,000
Net defined benefit assets	0	0	70,938,000,000
Other assets	158,404,000,000	148,399,000	128,846,000,000
Total assets	316,295,461,000,000	296,317,720,000	310,682,727,000,000
LIABILITIES [Abstract]
Financial liabilities at fair value through profit or loss	3,427,909,000,000	3,211,397,000	3,803,358,000,000
Deposits due to customers	234,695,084,000,000	219,871,357,000	221,020,411,000,000
Borrowings	14,784,706,000,000	13,850,880,000	18,769,515,000,000
Debentures	27,869,651,000,000	26,109,358,000	23,565,449,000,000
Provisions	410,470,000,000	384,544,000	428,477,000,000
Net defined benefit liability	43,264,000,000	40,531,000	64,666,000,000
Current tax liabilities	232,600,000,000	217,909,000	171,192,000,000
Deferred tax liabilities	22,681,000,000	21,249,000	22,023,000,000
Derivative liabilities	67,754,000,000	63,475,000	7,221,000,000
Other financial liabilities	13,892,461,000,000	13,014,991,000	21,985,086,000,000
Other liabilities	283,981,000,000	266,041,000	299,376,000,000
Total liabilities	295,730,561,000,000	277,051,732,000	290,136,774,000,000
EQUITY [Abstract]
Owner's equity	20,365,892,000,000	19,079,549,000	20,386,160,000,000
Capital stock	3,381,392,000,000	3,167,818,000	3,381,392,000,000
Hybrid securities	3,017,888,000,000	2,827,273,000	3,574,896,000,000
Capital surplus	285,880,000,000	267,824,000	286,331,000,000
Other equity	(1,939,274,000,000)	(1,816,787,000)	(1,468,025,000,000)
Retained earnings	15,620,006,000,000	14,633,421,000	14,611,566,000,000
Non-controlling interests	199,008,000,000	186,439,000	159,793,000,000
Total equity	20,564,900,000,000	19,265,988,000	20,545,953,000,000
Total liabilities and equity	₩ 316,295,461,000,000	$ 296,317,720,000	₩ 310,682,727,000,000

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Consolidated Statements Of Comprehensive Income $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩) ₩ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 KRW (₩) ₩ / shares	Dec. 31, 2015 KRW (₩) ₩ / shares
Statement of comprehensive income [Abstract]
Net interest income	₩ 5,220,650	$ 4,890,904	₩ 5,019,544	₩ 4,761,900
Interest income	8,550,687	8,010,611	8,512,312	8,698,235
Interest expense	(3,330,037)	(3,119,707)	(3,492,768)	(3,936,335)
Net fees and commissions income	1,070,466	1,002,853	937,131	976,796
Fees and commissions income	2,069,198	1,938,504	1,865,470	1,757,340
Fees and commissions expense	(998,732)	(935,651)	(928,339)	(780,544)
Dividend income	124,992	117,097	184,510	102,923
Net gain (loss) on financial instruments at fair value through profit or loss	(104,827)	(98,206)	114,387	240,342
Net gain (loss) on available-for-sale financial assets	192,708	180,536	(1,035)	(3,281)
Impairment losses due to credit loss	(785,133)	(735,543)	(834,076)	(966,646)
General and administrative expenses	(3,530,801)	(3,307,789)	(3,478,476)	(3,150,387)
Net other operating expenses	(31,313)	(29,334)	(367,779)	(610,061)
Operating income	2,156,742	2,020,518	1,574,206	1,351,586
Share of losses of joint ventures and associates	(101,514)	(95,102)	(19,507)	(70,124)
Other net non-operating income (expense)	(105,722)	(99,044)	(1,310)	170,484
Non-operating income (loss)	(207,236)	(194,146)	(20,817)	100,360
Net income before income tax expense	1,949,506	1,826,372	1,553,389	1,451,946
Income tax expense	(419,418)	(392,927)	(275,856)	(376,554)
Net income	1,530,088	1,433,445	1,277,533	1,075,392
Remeasurement of the net defined benefit liability	10,497	9,834	34,162	(78,267)
Items that will not be reclassified to profit or loss	10,497	9,834	34,162	(78,267)
Gain (loss) on valuation of available-for-sale financial assets	(84,498)	(79,161)	12,586	72,297
Share of other comprehensive income (loss) of joint ventures and associates	612	574	(7,937)	3,295
Gain on foreign currencies translation of foreign operations	(208,329)	(195,171)	28,712	33,837
Gain (loss) on valuation of cash flow hedge	777	728	10,371
Equity related to assets held for sale	4,145	3,883
Items that may be reclassified to profit or loss	(287,293)	(269,147)	43,732	109,429
Other comprehensive income(loss), net of tax	(276,796)	(259,313)	77,894	31,162
Total comprehensive income	1,253,292	1,174,132	1,355,427	1,106,554
Net income attributable to:
Net income attributable to owners	1,512,148	1,416,638	1,261,266	1,059,157
Net Income (loss) attributable to non-controlling interests	17,940	16,807	16,267	16,235
Total comprehensive income attributable to:
Comprehensive income attributable to owners	1,249,057	1,170,164	1,332,614	1,094,870
Comprehensive income (loss) attributable to non-controlling interests	₩ 4,235	$ 3,969	₩ 22,813	₩ 11,684
Basic and diluted earnings from continuing and discontinued operations per share (Note 43)(Unit: Korean Won and U.S. Dollar) | (per share)	₩ 1,999	$ 1.873	₩ 1,567	₩ 1,301
Basic and diluted earnings from continuing operations per share (Note 43) (Unit: Korean Won and U.S. Dollar) | (per share)	₩ 1,999	$ 1.873	₩ 1,567	₩ 1,301

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Consolidated Statements Of Changes In Equity $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	Owner's equity KRW (₩)	Owner's equity USD ($)	Capital Stock KRW (₩)	Capital Stock USD ($)	Hybrid securities KRW (₩)	Hybrid securities USD ($)	Capital surplus KRW (₩)	Capital surplus USD ($)	Other equity KRW (₩)	Other equity USD ($)	Retained earnings KRW (₩)	Retained earnings USD ($)	Non-controlling interest KRW (₩)	Non-controlling interest USD ($)
Balance at beginnig at Dec. 31, 2014	₩ 18,093,425		₩ 17,983,501		₩ 3,381,392		₩ 2,538,823		₩ 291,066		₩ (2,393,138)		₩ 14,165,358		₩ 109,924
Changes in equity [Abstract]
Net income	1,075,392		1,059,157										1,059,157		16,235
Dividends	(505,776)		(504,952)										(504,952)		(824)
Gain (loss) on valuation of available-for-sale financial assets	72,297		73,691								73,691				(1,394)
Share of other comprehensive gain (loss) of joint ventures and associates	3,295		3,295								3,295
Gain on foreign currencies translation of foreign operations	33,837		36,932								36,932				(3,095)
Remeasurement of the net defined benefit liability	(78,267)		(78,204)								(78,204)				(63)
Dividends to hybrid securities	(183,320)		(183,320)										(183,320)
Issuance of hybrid securities	795,179		795,179				795,179
Change in ownership interest of investments in consolidated subsidiaries and others	3,853		3,193						3,193						660
Appropriation of merger losses											806,640		(806,640)
Retirement of treasury stock											3,481		(3,481)
Balance at end at Dec. 31, 2015	19,309,915		19,188,472		3,381,392		3,334,002		294,259		(1,547,303)		13,726,122		121,443
Changes in equity [Abstract]
Net income	1,277,533		1,261,266										1,261,266		16,267
Dividends	(169,603)		(168,317)										(168,317)		(1,286)
Changes in capital surplus of consolidated subsidiaries	2		2						(7,928)		7,930
Changes in non-controlling interests due to acquisition of subsidiary	16,823														16,823
Gain (loss) on valuation of available-for-sale financial assets	12,586		12,296								12,296				290
Share of other comprehensive gain (loss) of joint ventures and associates	(7,937)		(7,937)								(7,937)
Gain on foreign currencies translation of foreign operations	28,712		22,436								22,436				6,276
Remeasurement of the net defined benefit liability	34,162		34,182								34,182				(20)
Gain (loss) on valuation of cash flow hedge	10,371		10,371								10,371
Dividends to hybrid securities	(206,515)		(206,515)										(206,515)
Issuance of hybrid securities	549,904		549,904				549,904
Redemption of hybrid securities	(310,000)		(310,000)				(309,010)						(990)
Balance at end at Dec. 31, 2016	20,545,953	$ 19,248,236	20,386,160	$ 19,098,536	3,381,392	$ 3,167,818	3,574,896	$ 3,349,100	286,331	$ 268,246	(1,468,025)	$ (1,375,303)	14,611,566	$ 13,688,675	159,793	$ 149,700
Changes in equity [Abstract]
Net income	1,530,088	1,433,445	1,512,148	1,416,638									1,512,148	1,416,638	17,940	16,807
Dividends	(338,190)	(316,829)	(336,636)	(315,373)									(336,636)	(315,373)	(1,554)	(1,456)
Subsidiary capital increase	36,083	33,805	(451)	(422)					(451)	(422)					36,534	34,227
Gain (loss) on valuation of available-for-sale financial assets	(84,498)	(79,161)	(85,051)	(79,679)							(85,051)	(79,679)			553	518
Share of other comprehensive gain (loss) of joint ventures and associates	612	574	612	574							612	574
Gain on foreign currencies translation of foreign operations	(208,329)	(195,171)	(194,347)	(182,072)							(194,347)	(182,072)			(13,982)	(13,099)
Remeasurement of the net defined benefit liability	10,497	9,834	10,773	10,092							10,773	10,092			(276)	(258)
Gain (loss) on valuation of cash flow hedge	777	728	777	728							777	728
Equity related to assets held for sale	4,145	3,883	4,145	3,883							4,145	3,883
Dividends to hybrid securities	(167,072)	(156,519)	(167,072)	(156,519)									(167,072)	(156,519)
Issuance of hybrid securities	559,565	524,222	559,565	524,222			559,565	524,222
Redemption of hybrid securities	(1,324,731)	(1,241,059)	(1,324,731)	(1,241,059)			(1,116,573)	(1,046,049)			(208,158)	(195,010)
Balance at end at Dec. 31, 2017	₩ 20,564,900	$ 19,265,988	₩ 20,365,892	$ 19,079,549	₩ 3,381,392	$ 3,167,818	₩ 3,017,888	$ 2,827,273	₩ 285,880	$ 267,824	₩ (1,939,274)	$ (1,816,787)	₩ 15,620,006	$ 14,633,421	₩ 199,008	$ 186,439

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Consolidated Statements Of Cash Flows	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Cash flows from operating activities
Net income	₩ 1,530,088,000,000	$ 1,433,445,000	₩ 1,277,533,000,000	₩ 1,075,392,000,000
Adjustments:
Income tax expense	419,418,000,000	392,927,000	275,856,000,000	376,554,000,000
Interest income	(8,550,687,000,000)	(8,010,611,000)	(8,512,312,000,000)	(8,698,235,000,000)
Interest expense	3,330,037,000,000	3,119,707,000	3,492,768,000,000	3,936,335,000,000
Dividend income	(124,992,000,000)	(117,097,000)	(184,510,000,000)	(102,923,000,000)
Impairment losses due to credit loss	785,133,000,000	735,543,000	834,076,000,000	966,646,000,000
Loss on valuation of financial instruments at fair value through profit or loss	15,267,000,000	14,302,000	0	0
Loss on available-for-sale financial assets	0	0	1,035,000,000	3,281,000,000
Share of losses of investments in joint ventures and associates	185,020,000,000	173,334,000	56,264,000,000	111,487,000,000
Loss on transaction of derivatives / valuation of derivatives	109,569,000,000	102,648,000	98,981,000,000	20,982,000,000
Loss on fair value hedged items	0	0	475,000,000	56,532,000,000
Provisions	107,028,000,000	100,268,000	34,774,000,000	72,062,000,000
Retirement benefits	142,902,000,000	133,876,000	152,609,000,000	132,131,000,000
Depreciation and amortization	235,795,000,000	220,901,000	252,031,000,000	240,764,000,000
Loss on disposal of investments in joint ventures and associates	38,713,000,000	36,268,000	15,060,000,000	10,000,000
Loss on disposal of premises and equipment and other assets	9,994,000,000	9,363,000	9,718,000,000	2,707,000,000
Impairment loss on premises and equipment and other assets	390,000,000	365,000	1,936,000,000	2,990,000,000
Gain on valuation of financial instruments at fair value through profit or loss	0	0	(75,690,000,000)	(55,773,000,000)
Gain on available-for-sale financial assets	(192,708,000,000)	(180,536,000)	0	0
Share of profits of investments in joint ventures and associates	(83,506,000,000)	(78,232,000)	(36,757,000,000)	(41,363,000,000)
Gain on transaction of derivatives / valuation of derivatives	(122,000,000)	(114,000)	(130,000,000)	(59,003,000,000)
Gain on fair value hedged items	(53,532,000,000)	(50,150,000)	(99,302,000,000)	(25,235,000,000)
Reversal of provisions	(2,567,000,000)	(2,405,000)	(1,396,000,000)	(854,000,000)
Gain on disposal of investments in joint ventures and associates	(39,932,000,000)	(37,410,000)	(23,457,000,000)	(61,653,000,000)
Gain on disposal of premises and equipment and other assets	(5,028,000,000)	(4,711,000)	(1,885,000,000)	(6,814,000,000)
Reversal of impairment loss on premises and equipment and other assets	(666,000,000)	(624,000)	(3,581,000,000)	(539,000,000)
Changes in operating assets and liabilities:
Financial instruments at fair value through profit or loss	(583,068,000,000)	(546,241,000)	(99,581,000,000)	(495,507,000,000)
Loans and receivables	(9,647,563,000,000)	(9,038,208,000)	(14,433,390,000,000)	(23,150,910,000,000)
Other assets	35,953,000,000	33,682,000	219,323,000,000	1,922,000,000
Deposits due to customers	13,634,873,000,000	12,773,672,000	11,878,628,000,000	20,620,287,000,000
Provision for guarantee and loan commitment	(122,711,000,000)	(114,960,000)	34,376,000,000	(66,399,000,000)
Net defined benefit liability	(46,789,000,000)	(43,834,000)	(261,097,000,000)	(255,585,000,000)
Other financial liabilities	(7,966,786,000,000)	(7,463,591,000)	5,158,055,000,000	1,205,411,000,000
Other liabilities	(27,550,000,000)	(25,811,000)	(6,163,000,000)	(91,116,000,000)
Cash received from (paid for) operating activities:
Interest income received	8,570,715,000,000	8,029,375,000	8,511,349,000,000	8,692,851,000,000
Interest expense paid	(3,404,608,000,000)	(3,189,567,000)	(3,593,358,000,000)	(4,355,880,000,000)
Dividends received	127,343,000,000	119,300,000	184,674,000,000	100,368,000,000
Income tax paid	(404,428,000,000)	(378,884,000)	(251,627,000,000)	(534,829,000,000)
Net cash provided by (used in) operating activities	(1,979,005,000,000)	(1,854,010,000)	4,905,285,000,000	(383,906,000,000)
Cash flows from investing activities
Disposal of available-for-sale financial assets	24,912,752,000,000	23,339,222,000	20,395,744,000,000	18,426,846,000,000
Redemption of held-to-maturity financial assets	8,587,092,000,000	8,044,717,000	8,462,346,000,000	6,404,711,000,000
Disposal of investments in joint ventures and associates	70,180,000,000	65,747,000	97,135,000,000	75,599,000,000
Disposal of subsidiaries	203,000,000	191,000	0	0
Disposal of investment properties	418,000,000	392,000	0	0
Disposal of premises and equipment	7,428,000,000	6,959,000	63,000,000	18,600,000,000
Disposal of intangible assets	1,188,000,000	1,113,000	4,325,000,000	1,782,000,000
Disposal of assets held for sale	24,808,000,000	23,241,000	22,723,000,000	3,711,000,000
Decrease of derivatives for hedging	0	0	0	56,956,000,000
Net cash flows through business combination(Note 46)	0	0	(132,301,000,000)	(38,535,000,000)
Acquisition of available-for-sale financial assets	(19,674,346,000,000)	(18,431,682,000)	(23,844,849,000,000)	(16,305,797,000,000)
Acquisition of held-to-maturity financial assets	(11,521,065,000,000)	(10,793,376,000)	(8,818,376,000,000)	(7,138,013,000,000)
Acquisition of investments in joint ventures and associates	(143,161,000,000)	(134,119,000)	(43,281,000,000)	(1,098,000,000)
Acquisition of investment properties	(9,872,000,000)	(9,248,000)	(4,428,000,000)
Acquisition of premises and equipment	(162,245,000,000)	(151,998,000)	(131,009,000,000)	(129,454,000,000)
Acquisition of intangible assets	(195,929,000,000)	(183,552,000)	(191,161,000,000)	(97,891,000,000)
Increase of derivatives for hedging	(13,742,000,000)	(12,874,000)	(42,544,000,000)	(3,273,000,000)
Net cash provided by (used in) investing activities	1,883,709,000,000	1,764,733,000	(4,225,613,000,000)	1,274,144,000,000
Cash flows from financing activities
Increase in borrowings	9,057,999,000,000	8,485,881,000	8,259,380,000,000	12,674,649,000,000
Issuance of debentures	18,438,221,000,000	17,273,633,000	15,848,055,000,000	13,502,777,000,000
Issuance of hybrid securities	559,565,000,000	524,222,000	549,904,000,000	795,179,000,000
Capital increase of subsidiaries	35,841,000,000	33,578,000	0	0
Increase of paid in capital in subsidiaries	0	0	0	3,787,000,000
Decrease in borrowings	(12,692,883,000,000)	(11,891,179,000)	(9,524,626,000,000)	(10,346,919,000,000)
Repayment of debentures	(13,620,520,000,000)	(12,760,226,000)	(14,118,720,000,000)	(16,425,353,000,000)
Dividends paid	(336,636,000,000)	(315,373,000)	(168,317,000,000)	(504,952,000,000)
Dividends paid on hybrid securities	(177,730,000,000)	(166,505,000)	(201,328,000,000)	(179,758,000,000)
Repayment of hybrid securities	(1,323,400,000,000)	(1,239,812,000)	(310,000,000,000)	0
Dividends paid on non-controlling interests	(1,554,000,000)	(1,456,000)	(1,286,000,000)	(824,000,000)
Net cash provided by (used in) financing activities	(61,097,000,000)	(57,237,000)	333,062,000,000	(481,414,000,000)
Net increase (decrease) in cash and cash equivalents	(156,393,000,000)	(146,514,000)	1,012,734,000,000	408,824,000,000
Cash and cash equivalents, beginning of the period	7,591,324,000,000	7,111,843,000	6,644,055,000,000	5,962,861,000,000
Effects of exchange rate changes on cash and cash equivalents	(526,645,000,000)	(493,382,000)	(65,465,000,000)	272,370,000,000
Cash and cash equivalents, end of the period (Note 6)	₩ 6,908,286,000,000	$ 6,471,947,000	₩ 7,591,324,000,000	₩ 6,644,055,000,000

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General

12 Months Ended

Dec. 31, 2017

Disclosure of notes and other explanatory information [Abstract]

General

1. GENERAL

(1) Summary of the parent company

Woori Bank (hereinafter referred to the “Bank”), which is a controlling entity in accordance with International Financial Reporting Standards (“IFRS”) 10—Consolidated Financial Statements, was established in 1899 and is engaged in the commercial banking business under the Banking Act, trust business under the Financial Investment Services and Capital Market Act, and foreign currencies exchange business with approval from the Bank of Korea (“BOK”) and the Ministry of Finance and Economy (“MOFE”).

Previously, Woori Finance Holdings Co., Ltd., the former holding company of Woori Financial Group, established on March 27, 2001 held a 100% ownership of the Bank. Effective November 1, 2014, Woori Finance Holdings Co., Ltd. completed its merger with and into Woori Bank, its wholly-owned subsidiary, as contemplated by the merger agreement dated July 28, 2014, by and between Woori Finance Holdings Co., Ltd. and Woori Bank. Accordingly, the shares of the Bank, 597 million shares, prior to the merger, were reduced to nil in accordance with capital reduction procedure, and then, in accordance with the merger ratio, the Bank newly issued 676 million shares. As a result, as of December 31, 2017, the common stock of the Bank amounts, expressed in Korean Won (the “KRW” or “Won”), to 3,381,392 million Won.

During the year ended December 31, 2016, the Korea Deposit Insurance Corporation (“KDIC”), as the majority shareholder of the Bank, sold 187 million shares in the Bank in accordance with the contract of ‘Disposal of Woori Bank’s shares to Oligopolistic Shareholders’. In addition to the sale, during the year ended December 31, 2017, KDIC sold additional 33 million shares. As of December 31, 2016 and 2017, KDIC held 158 million shares and 125 million shares (23.37% and 18.43% ownership interest) respectively, of the Bank’s shares issued.

On June 24, 2002, Woori Finance Holdings Co., Ltd. listed its common shares on the Korea Exchange through public offering. In addition, on September 29, 2003, the holding company registered with the Securities and Exchange Commission in the United States of America and, on the same day, listed its American Depositary Shares on the New York Stock Exchange. As Woori Finance Holdings Co., Ltd. was merged into the Bank, the Bank, which is the existing company, succeeded such rights and obligations as a listed company on the Korea Exchange and the New York Stock Exchange.

As a result of such merger, the Bank incorporated Woori Card Co., Ltd., Woori Investment Bank Co., Ltd., Woori FIS Co., Ltd., Woori Private Equity Asset Management Co., Ltd., and Woori Finance Research Institute Co., Ltd. as its subsidiaries.

The head office of the Bank is located in 51 Sogong-ro, Jung Gu, Seoul, Korea. The Bank has 876 branches and offices in Korea, and 23 branches and offices overseas as of December 31, 2017.

(2) The consolidated financial statements for Woori Bank and its subsidiaries (the “Group”) include the following subsidiaries:

			Percentage of ownership (%)
Subsidiaries	Main business		December 31, 2016		December 31, 2017
Woori Bank:
Woori FIS Co., Ltd.		System software development & maintenance		100.0		100.0
Woori Private Equity Asset Management Co., Ltd.		Finance		100.0		100.0
Woori Finance Research Institute Co., Ltd.		Other service business		100.0		100.0
Woori Card Co., Ltd.		Finance		100.0		100.0
Woori Investment Bank Co., Ltd.(*1)		Other credit finance business		58.2		59.8
Woori Credit Information Co., Ltd.		Credit information		100.0		100.0
Woori America Bank		Finance		100.0		100.0
Woori Global Markets Asia Limited		”		100.0		100.0
Woori Bank China Limited		”		100.0		100.0
AO Woori Bank		”		100.0		100.0
PT Bank Woori Saudara Indonesia 1906 Tbk(*1)		”		74.0		79.9
Banco Woori Bank do Brasil S.A.		”		100.0		100.0
Korea BTL Infrastructure Fund		”		99.9		99.9
Woori Fund Service Co., Ltd.		”		100.0		100.0
Woori Finance Cambodia PLC.		”		100.0		100.0
Woori Finance Myanmar Co., Ltd.		”		100.0		100.0
Wealth Development Bank		”		51.0		51.0
Woori Bank Vietnam Limited		”		100.0		100.0
Kumho Trust First Co., Ltd.(*2)		Asset securitization		0.0		0.0
Asiana Saigon Inc.(*2)		”		0.0		0.0
An-Dong Raja First Co., Ltd.(*6)		”		0.0		—
Consus Eighth Co., LLC(*2)		”		0.0		0.0
KAMCO Value Recreation First Securitization Specialty Co., Ltd.(*2)		”		15.0		15.0
Hermes STX Co., Ltd.(*2)		”		0.0		0.0
BWL First Co., LLC(*2)		”		0.0		0.0
Woori Poongsan Co., Ltd.(*6)		”		0.0		—
Deogi Dream Fourth Co., Ltd.(*2)		”		0.0		0.0
Jeonju Iwon Ltd.(*2)		”		0.0		0.0
Wonju I one Inc.(*2)		”		0.0		0.0
Heitz Third Co., Ltd.(*2)		”		0.0		0.0
Woorihansoop 1st Co., Ltd.(*2)		”		0.0		0.0
Electric Cable First Co., Ltd(*2)		”		0.0		0.0
Woori International First Co., Ltd.(*2)		”		0.0		0.0
Woori HJ First Co., Ltd.(*2)		”		0.0		0.0
Woori WEBST 1st Co., Ltd.(*2)		”		—		0.0
HNLD 1st Inc.(*2)		”		—		0.0
Wibihansoop 1st Co., Ltd.(*2)		”		—		0.0
Uri QS 1st Co., Ltd(*2)		”		—		0.0
Uri Display 1st Co., Ltd.(*2)		”		—		0.0
Tiger Eyes 2nd Co., Ltd.(*2)		”		—		0.0
Woori Serveone 1st Co., Ltd.(*2)		”		—		0.0
HeungkukWoori Tech Company Private Placement Investment Trust No.1 and 5 beneficiary certificates(*3)		Securities investment and others		—		—
Principle Guaranteed Trust(*4)		Trust		0.0		0.0
Principle and Interest Guaranteed Trust(*4)		”		0.0		0.0
Woori Bank and Woori Private Equity Asset Management Co., Ltd.:
Woori Private Equity Fund(*5)		Other financial business		31.9		—
Woori Private Equity Fund:
Woori EL Co., Ltd.(*5)		Other financial business		100.0		—
Woori Investment Bank:
Dongwoo First Securitization Specialty Co., Ltd.(*2)		Asset securitization		5.0		5.0
Seari First Securitization Specialty Co., Ltd.(*2)		Asset securitization		—		5.0
Namjong 1st Securitization Specialty Co., Ltd.(*2)		”		—		5.0
Bukgeum First Securitization Specialty Co., Ltd.(*2)		”		—		5.0
Woori Card Co., Ltd.:
TUTU Finance-WCI Myanmar Co., Ltd.		Finance		100.0		100.0
Woori Card one of 2017-1 Securitization Specialty Co., Ltd.(*2)		Asset securitization		—		0.5
Woori Card one of 2017-2 Securitization Specialty Co., Ltd.(*2)		”		—		0.5

(*1) The entity issued a rights offering that entitles its existing shareholders to buy additional shares directly from the entity in proportion to its existing holders. But, some shareholders opted not to buy the new share and Woori Bank was able to purchase more shares than they would be in accordance with their ownership percentage. This purchase resulted in the increase of its ownership percentage.

(*2) The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

(*3) The entity is a structured entity for the purpose of investment in securities and is in scope for consolidation, considering that the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

(*4) The entity is a money trust under the Financial Investment Services and Capital Markets Act and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

(*5) Due to liquidation of Woori Private Equity Asset Management Co., Ltd. during the year ended December 31, 2017 the entity was excluded from the scope for consolidation.

(*6) Due to liquidation during the year ended of December 31, 2017, the entity was excluded from the scope for consolidation.”

To determine whether the Group controls the structured entities, where the Group does not hold any ownership in them, the Group considered various factors in accordance with the Group’s accounting policy, which can be summarized as follows:

Involvement with the entity	The Group’s role within the entity	Structured Entities
The Group is involved with structured entities through the purchase of securities issued by the structured entities, such as senior, mezzanine, or subordinated bonds.	This is a case where the Group arranges the securitizations of its own or third parties’ assets and supports the transaction by purchasing the subordinated bond issued by the structured entity. As for the consolidated structured entities in this category, the Group is significantly exposed to the variable returns from the entities through the subordinated holdings more than other investors and the Group has the power over relevant activities that significantly affect the variable return—such as the Group has the right to determine to wind down the entity, as a major investor, in case of default.	•  KAMCO Value Recreation First Securitisation Specialty CO., Ltd.
The Group is involved with structured entities through the provision of credit facilities to the entities, such as through financial guarantee and purchase agreement of asset-backed commercial papers (‘ABCP’).	This is a case where the Group supports the securitization transactions through provision of liquidity facilities or other credit enhancements, such as financial guarantees. The Group also sponsors a number of asset-backed commercial paper (ABCP) conduits by arranging the acquisition of loans. As for the consolidated structured entities in this category, the Group is significantly exposed to the variable returns from the entities through the financial guarantees or purchase	•  Kumho Trust First Co., Ltd and 14 structured entities
	agreement provided more than other investors and the Group has the power over relevant activities that significantly effects the variable return—such as the Group has the right to determine to dispose the securitized assets of the entity, through the contracts, in case of default.
The Group is involved with a structured entity by originating loans directly to the entity.	This is a case where the Group invests in a structured entity, such as origination of loans. As for the consolidated structured entities in this category, the Group is significantly exposed to the variable returns from the entities through the loan originated and the Group has the power over relevant activities that significantly effects the variable return—such as the Group makes significant investment decisions.	•  Consus Eighth Co., LLC.
The Group manages funds on behalf of the customers through the operation of trusts accounts.	This is a case where the Group is designated as a trustee by the customers (or investors) of the trusts to manage operations, investments, and financing, and they do not participate in such decision making process. As for the consolidated structured entities in this category, the Group is exposed to expected loss from the trusts, through its provision of guarantee on the original principal or both of principal and interests.	•  Principal guaranteed trusts •  Principal and interest guaranteed trusts

(3) As of December 31, 2016 and 2017, despite having more than a 50% ownership interests, the Group has not consolidated the following companies as the Group do not have the ability to control following subsidiaries:

	As of December 31, 2016
Entities	Location	Main business	Percentage of ownership (%)
Golden Bridge NHN Online Private Equity Investment(*1)	Korea	Securities Investment		60.0
Mirae Asset Maps Clean Water Private Equity Investment Trust 7th(*1)	Korea	Securities Investment		59.7
Kiwoom Yonsei Private Equity Investment Trust(*1)	Korea	Securities Investment		88.9
Kiwoom Frontier Professional Investment Private Fund 6 (Bond)(*2)	Korea	Securities Investment		50.0
	As of December 31, 2017
Subsidiaries	Location	Main Business	Percentage of ownership (%)
Golden Bridge NHN Online Private Equity Investment(*1)	Korea	Securities Investment		60.0
Mirae Asset Maps Clean Water Private Equity Investment Trust 7th(*1)	Korea	Securities Investment		59.7
Kiwoom Yonsei Private Equity Investment Trust(*1)	Korea	Securities Investment		88.9
Hana Walmart Real Estate Investment Trust 41-1(*1)	Korea	Securities Investment		90.1
IGIS Global Private Placement Real Estate Fund No. 148-1(*1)	Korea	Securities Investment		75.0
IGIS Global Private Placement Real Estate Fund No. 148-2(*1)	Korea	Securities Investment		75.0

(*1) The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.

(*2) Due to redemption of the fund during 2017, the fund was excluded from the list as of December 31, 2017 above.

(4) The summarized financial information before the elimination of intercompany transactions of the subsidiaries whose financial information were prepared under IFRS for the Group’s consolidated financial statements is as follows (Unit: Korean Won in millions):

	As of and for the year ended December 31, 2016
	Assets		Liabilities		Operating revenue		Net income (loss) attributable to owners			Comprehensive income (loss) attributable to owners
Woori FIS Co., Ltd.		141,329		105,821		244,783		1,048			1,432
Woori Private Equity Asset Management Co., Ltd.		97,338		53,244		2,154		312			219
Woori Finance Research Institute Co., Ltd.		3,710		334		4,445		108			100
Woori Card Co., Ltd.		7,606,108		6,180,893		1,555,373		109,393			116,381
Woori Investment Bank Co., Ltd.		1,576,627		1,404,566		178,572		23,872			23,897
Woori Credit Information		31,292		4,416		27,884		543			618
Woori America Bank		2,186,049		1,973,263		73,909		15,266			20,899
Woori Global Markets Asia Limited		272,008		147,581		7,255		1,863			5,582
Woori Bank (China) Limited		4,984,017		4,466,812		475,174		32,025			11,505
AO Woori Bank		239,860		188,474		16,221		5,650			15,553
PT Bank Woori Saudara Indonesia 1906 Tbk		2,089,822		1,693,111		179,014		24,573			48,542
Banco Woori Bank do Brasil S.A.		241,229		206,043		17,059		2,786			9,600
Korea BTL Infrastructure Fund		784,770		299		33,476		29,617			29,617
Woori Fund Service Co., Ltd.		11,386		1,372		7,787		1,011			1,011
Woori Finance Cambodia PLC.		32,405		24,751		4,545		1,250			1,494
Woori Finance Myanmar Co., Ltd.		4,305		2,651		380		(613	)		(569	)
Wealth Development Bank		209,779		174,446		12,519		1,248			1,876
Woori Bank Vietnam Limited		159,223		278		—		(346	)		3,545
Money trust under the FISCM Act(*)		1,525,145		1,495,815		55,540		697			697
Structured entity for the securitization of financial assets		487,431		895,824		29,480		6,912			7,138
Structured entity for the investments in securities		4,397,163		1,898,977		137,896		56,605			61,535

	As of and for the year ended December 31, 2017
	Assets		Liabilities		Operating revenue		Net income (loss) attributable to owners			Comprehensive income (loss) attributable to owners
Woori FIS Co., Ltd.		103,932		71,386		252,460		1,940			(2,963	)
Woori Private Equity Asset Management Co., Ltd.		42,894		2,670		7,257		(4,114	)		(4,074	)
Woori Finance Research Institute Co., Ltd.		3,790		350		4,733		83			64
Woori Card Co., Ltd.		8,605,993		6,973,705		1,771,157		101,214			107,321
Woori Investment Bank Co., Ltd.		1,880,157		1,588,610		183,376		20,023			20,210
Woori Credit Information Co., Ltd.		33,298		6,175		31,580		861			752
Woori America Bank		1,954,301		1,679,248		81,337		11,869			(16,833	)
Woori Global Markets Asia Limited		290,226		178,343		11,345		1,922			(12,544	)
Woori Bank (China) Limited		4,960,637		4,458,683		388,913		13,809			(15,252	)
AO Woori Bank		201,704		149,101		15,656		4,748			1,217
PT Bank Woori Saudara Indonesia 1906 Tbk		2,230,617		1,745,171		192,485		38,488			(18,689	)
Banco Woori Bank do Brasil S.A.		213,889		181,544		20,455		1,843			(2,840	)
Korea BTL Infrastructure Fund		786,480		301		30,240		26,390			26,390
Woori Fund Service Co., Ltd.		12,653		1,242		9,021		1,398			1,398
Woori Finance Cambodia PLC.		51,304		32,873		5,895		983			(473	)
Woori Finance Myanmar Co., Ltd.		18,236		5,307		2,506		791			15
Wealth Development Bank		191,049		156,808		13,632		1,323			(1,093	)
Woori Bank Vietnam Limited		775,758		632,160		29,698		2,436			(15,347	)
Money trust under the FISCM Act(*)		1,560,672		1,530,760		44,344		582			582
Structured entity for the securitization of financial assets		867,583		1,275,719		22,730		1,179			(2,800	)
Structured entity for the investments in securities		34,939		76		377		(475	)		(38,592	)

(*) FISCM Act: Financial Investment Services and Capital Markets Act

(5) Structured entities

The Group is involved with structured entities, mainly through securitization of financial assets, investment fund, and money trust.

• Structured entity for the securitization of financial assets

The structured entity is established for the purpose of securitization of project financing loans, corporate bonds, and other financial assets. The Group is involved with the structured entity through providing with credit facility over asset-backed commercial papers issued by the entity, originating loans directly to the structured entity, or purchasing 100% of the subordinated debts issued by the structured entity.

• Structured entity for the investments in securities

The structured entity is established for the purpose of investments in securities. The Group acquires beneficiary certificates through its contribution of fund to the structured entity, and it is exposed to the risk that it may not be able to recover its fund depending on the result of investment performance of asset managers of the structured entity.

• Money trust under the Financial Investment Services and Capital Markets Act

The Group provides with financial guarantee of principal and interest or principal only to some of its trust products. Due to the financial guarantees, the Group may be obliged to supplement when the principal and interest or principal of the trust product sold is short of the guaranteed amount depending on the result of investment performance of the trust product.

Structured entities are assessed for consolidation in accordance with the accounting policy set out in Note 2. (2), and also refer to Note 1. (2).

Consolidated structured entities

• Securitizations

The Group uses structured entities to securitize loan and receivables, corporate bonds, and other financial assets that it has originated or acquired in order to diversify its source of funding for asset origination and capital efficiency purposes. In turn, the structured entities issue asset backed securities collateralized by the transferred financial assets. In these securitizations, various classes of debt securities are issued to the Group and third parties, and the structured entities have mainly issued subordinated notes to the Group, an assets transferor. The subordinated notes are designed to absorb potentially could be significant to the structured entities. These structured entities are generally consolidated when the Group has the power to direct the relevant activities of the entities and exposed to or have rights to variable returns from the entities. In addition, the Group involves with structured entities which are established by third parties mainly for securitization through provision of liquidity facilities including financial guarantees, which are designed to provide credit support to the entities, or investing in securities issued by structured entities or providing financing to structured entities through loans.

• Investment funds

The Group has established a number of money market and non-money market funds where it is deemed to be acting as principal rather than agent its role as investment manager, the Group controls and hence consolidate these funds. Also the Group is deemed to control a number of third-party managed funds through its involvement as a principal in the funds.

• Money trusts under the Trust Business Act

The Group has consolidated its guaranteed money trusts due to its provision of financial guarantee for investors over principal and interest or principal only. Thus, the Group may be obliged to supplement when the principal or interest of the money trusts is short of the guaranteed amount.

Unconsolidated structured entities

The Group has entered into various agreements with structured entities such as asset securitization vehicles, and structured finance and investment funds. Where it is determined in accordance with IFRS 10 that the Group has no controlling power over such structured entities, the entities are not consolidated. The nature of interests, which the Group retains, and the risks, to which the Group is exposed, of the unconsolidated structured entities are as follows:

Asset securitization vehicle issues asset-backed securities and redeems the principal and interest or distributes dividends on asset-backed securities with profits from collecting cash flows or sale of securitized assets. The Group, as a secondary guarantor, provides purchase commitments for its asset-backed securities or guarantees to such asset securitization vehicle and recognizes commission income or interest income related to the commitment or guarantees. Therefore, the Group would be exposed to risks to purchases or pays back asset-backed securities issued by the vehicles when a primary guarantor fails to provide the financing asset securitization vehicles.

Structured finance includes investments in project financing on real estates, social overhead capital (“SOC”), infrastructure and shipping finance. They are formed as special purpose entity by funding through equity investments and loans from various investors. Investment decisions are made by the Group based on business outlook of such projects. In relation to such investments, the Group recognizes interest income on loans, gains or losses on valuation of equity investments or dividend income. The structured finance is secured by additional funding agreement, guarantee or credit facilities. However, the structured financing project would fail to return the capital of equity investments or principal of loans to the Group if it is discontinued or did not achieve business outcome.

Investment funds include trusts and private equity funds. A trust is formed by contributions from various investors, operated by a manager engaged to the trust and distributed proceeds from sales of investments to the investors. A private equity fund is established in order to acquire ownership interests in a portfolio company with exit strategy after implementing financial and operational restructuring of the company. The Group recognizes unrealized gains or losses on change in value of investments in proposition of ownership interests in investments. The Group would be exposed to risks of loss when the value of portfolio investment is decreased.

Total assets of the unconsolidated structured entities, the carrying value of the related items recorded, the maximum exposure to risks, and the loss recognized in conjunction with the unconsolidated structured entities as of December 31, 2016 and 2017 are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Asset securitization vehicle		Structured finance		Investment Funds
Total asset of the unconsolidated structured entities		8,426,713		61,324,862		9,131,362
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities		3,361,910		2,790,215		1,749,494
Loans and receivables		65,470		2,414,044		—
Financial assets held for trading		—		254,150		—
Available-for-sale financial assets		1,216,446		115,843		1,664,865
Held-to-maturity financial assets		2,079,648		—		—
Investments in joint ventures and associates		—		—		84,629
Derivative assets		346		6,178		—
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities		1,363		1,224		—
Derivative liabilities		201		362		—
Other liabilities (including provisions)		1,162		862		—
The maximum exposure to risks		4,263,993		3,802,210		1,749,494
Investments		3,361,910		2,790,215		1,749,494
Purchase agreements		28,000		—		—
Credit facilities		834,083		970,195		—
Other commitments		40,000		41,800		—
Loss recognized on unconsolidated structured entities		6,353		71,185		683

	December 31, 2017
	Asset securitization vehicle		Structured finance		Investment Funds
Total asset of the unconsolidated structured entities		7,295,601		40,172,830		13,641,135
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities		3,215,159		2,314,043		1,138,523
Loans and receivables		43,180		1,969,760		—
Financial assets held for trading		—		233,428		10,160
Available-for-sale financial assets		902,390		106,819		904,774
Held-to-maturity financial assets		2,269,451		—		—
Investments in joint ventures and associates		—		—		223,589
Derivative assets		138		4,036		—
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities		1,433		1,506		—
Derivative liabilities		575		968		—
Other liabilities (including provisions)		858		538		—
The maximum exposure to risks		4,032,531		2,918,448		1,138,523
Investments		3,215,159		2,314,043		1,138,523
Credit facilities		817,372		604,405		—
Loss recognized on unconsolidated structured entities		837		3,939		5,993

(6) The details of the limitations with regard to the transfer of assets or the redemption of liabilities within the Group are provided below.

Some subsidiaries are regulated by the rules of the jurisdictions, in which they were incorporated, with regard to funding or management of deposits. Also, there is the limitation that they must have pre-approval from their regulators in case of remittance of earnings to the Group.

(7) Subsidiaries of which non-controlling interests are significant to the Group’s consolidated financial statements are as follows (Unit: Korean Won in millions):

1) Accumulated non-controlling interests at the end of the period

	December 31, 2016		December 31, 2017
Woori Investment Bank		73,986		119,111
PT Bank Woori Saudara Indonesia 1906 Tbk		70,249		64,877
Wealth Development Bank		16,983		16,778

2) Net income attributable to non-controlling interests

	For the year ended December 31, 2015		For the year ended December 31, 2016		For the year ended December 31, 2017
Woori Investment Bank		4,353		9,990		8,370
PT Bank Woori Saudara Indonesia 1906 Tbk		6,241		6,383		8,882
Wealth Development Bank		—		611		648

3) Dividends to non-controlling interests

	For the year ended December 31, 2015		For the year ended December 31, 2016		For the year ended December 31, 2017
PT Bank Woori Saudara Indonesia 1906 Tbk		778		1,242		1,513

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Significant Basis of Preparation and Accounting Policies

12 Months Ended

Dec. 31, 2017

Accounting policies [Abstract]

Significant Basis Of Preparation And Accounting Policies

2. SIGNIFICANT BASIS OF PREPARATION AND ACCOUNTING POLICIES

(1) Basis of presentation

The Group’s consolidated financial statements are prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).

The Group operates primarily in Korea and its official accounting records are maintained in Korean Won. The United States dollar (“U.S. dollar” or “US$” or “USD”) amounts are provided herein as supplementary information solely for the convenience of readers outside Korea. Korean Won amounts are expressed in U.S. Dollars at the rate of 1,067.42 Korean Won to US$1.00, the noon buying exchange rate in effect on December 31, 2017, as quoted by the Federal Reserve Bank of New York in the United States. Such convenience translation into U.S. Dollars should not be construed as representations that Korean Won amounts have been, could have been, or could in the future be, converted at this or any other rate of exchange.

The significant accounting policies that have been applied for the preparation of the consolidated financial statements for the year ended December 31, 2017 are described below. There have not been changes to the significant accounting policies except for the impacts from the adoptions of accounting standards or interpretations which are explained below.

The Group’s consolidated financial statements have been prepared based on the historical cost method except for specific non-current assets and certain financial assets or liabilities reported at fair value. Historical cost is generally based on the fair value of the consideration given in exchange for goods and services.

The consolidated financial statements of the Group were approved by the board of directors on March 2, 2018.

1) The Group has newly adopted the following new standards and interpretations that affected the Group’s accounting policies.

Amendments to IAS 7—Statement of Cash Flows

The amendments require an entity to provide disclosures that enable users of financial statements to evaluate changes in liabilities arising from financing activities, including both cash and non-cash changes. Additional disclosure required related to the first time application of these amendments in the current year are in note 6. Consistent with the transition provisions of the amendments, the Group has not disclosed comparative information for the prior period. Apart from the additional disclosure in note 6, the application of these amendments has no material impact on the disclosures or the amounts recognized in the Group’s consolidated financial statements.

Amendments to IAS 12—Income Taxes

The amendments clarify that in evaluating the deferred tax assets arising from deductible temporary difference of debt instruments measured at fair value, the carrying amount of an asset does not limit the estimation of probable future taxable profits. The application of these amendments has no material impact on the disclosures or the amounts recognized in the Group’s consolidated financial statements.

Other than the amendment stated above, there are several annual improvements in the current period, but the application of the amendments has had no material effect on the Group’s consolidated financial statements.

2) The Group has not applied the following IFRSs that have been issued but are not yet effective:

Enactments to IFRS 9—Financial Instruments

IFRS 9 issued in November 2009 introduced new requirements for the classification and measurement of financial assets. IFRS 9 was subsequently amended in October 2010 to include requirements for the classification and measurement of financial liabilities and for derecognition, and in November 2013 to include the new requirements for general hedge accounting. Another revised version of IFRS 9 was issued in July 2014 mainly to include a) impairment requirements for financial assets and b) limited amendments to the classification and measurement requirements by introducing a ‘fair value through other comprehensive income’(FVTOCI) measurement category for certain simple debt instruments. This standards supersedes IAS 39—Financial Instruments: Recognition and Measurement, and will be applied for annual periods beginning on or after January 1, 2018.

In principle, IFRS 9 must be applied retrospectively. However, there are certain exemptions to the application of retroactive approach such as presenting comparative information on classification, measurement and impairment of financial instruments. In addition, IFRS 9 is applied prospectively for hedge accounting with exceptions such as accounting for the time value of options. The Group will apply the standard retrospectively, in accordance with IAS 8 “Accounting Policies, Changes in Accounting Estimates and Errors”, but will not restate previous periods provided that it is not possible to do so without the use of hindsight. Because of this, the Group will recognise any difference between the previous carrying amount and the carrying amount at the beginning of the annual reporting period that includes the date of initial application of IFRS 9 (January 1, 2018) in the opening retained earnings as of January 1, 2018.

The Group has completed the design and implementation of the internal controls and/or financial reporting processes related to the presentation of financial instruments in order to adopt IFRS 9. The Group has completed a financial impact analysis on the 2017 financial statements based on available information as of year-end in order to determine the impact of adopting IFRS 9 for the first time. The expected financial impact of each key issue on the financial statement, is as follows.

a) Classification and Measurement of Financial Instruments

When IFRS 9 is adopted, all recognized financial assets that in scope are subsequently measured at either amortized cost, fair value through other comprehensive income (FVTOCI), or fair value through profit or loss (FVTPL) as shown below, based on the business model for managing financial assets and based on the nature of contractual cash flows arising from the financial assets. Also, when hybrid contracts contain financial asset as its host contract, the embedded derivative will not be bifurcated as the whole hybrid contract would be classified as a financial asset.

	Business Model
Nature of the contractual cash flow	Collection of the contractual cashflow	Collection of the contractual cashflow and sale of asset	Sale of asset, others
Principal and Interest only	Amortized Cost(*1)	FVTOCI(*1)	FVTPL
Other than the above		FVTPL(*2)

(*1) An irrevocable election is available to designate a financial asset to be classified as FVTPL, for the purpose of eliminating or reducing accounting discrepancies.

(*2) For equity securities held for purposes other than short-term trading, an irrevocable election is available to designate them as FVTOCI financial assets.

As the requirements to classify a financial asset as either amortized cost or FVTOCI are more stringent in IFRS 9 than in IAS 39, the variability of net income may increase as the amount of FVTPL financial assets is increased due to the adoption of IFRS 9.

As of year-end the Group currently holds loans and receivables amounting to 267,106,204 million Won, held-to-maturity financial assets amounting to 16,749,296 million Won. This amount includes 51,653 million Won of hybrid contracts in which the host contract, after separating the embedded derivatives, is a debt security. In addition, The group also holds available-for-sale financial assets amounting to 15,352,950 million Won, and FVTPL financial assets (except derivatives) amounting to 2,727,302 million Won as of year end in accordance with IAS 39.

According to IFRS 9, a financial asset may be measured at amortized cost only when its cashflows are solely principal and interest on specified dates on the contract and when the purpose of holding such asset is only to receive the contractual cashflows.

The estimated impact on the classification and measurement of Group’s financial assets (except derivatives) as of year-end is presented as follows. The following information is constructed from the accounting system for financial instruments built for the purpose of adopting IFRS 9.

(Unit : Korean Won in millions)

Classification per IAS 39	Classification per IFRS 9	Carrying Amount per IAS 39		Carrying Amount per IFRS 9
Loans and receivables (Deposits)	Amortized cost		8,870,835		8,870,835
Financial assets at FVTPL (Deposits)	FVTPL		25,972		25,972
Financial assets at FVTPL (Debt securities)	FVTPL		2,654,027		2,654,027
AFS financial assets (Debt securities)	FVTPL		46,855		46,855
AFS financial assets (Debt securities)	FVTOCI		12,874,209		12,874,209
AFS financial assets (Debt securities)	Amortized cost		308,181		322,300
Held-to-maturity financial assets (Debt securities)	Amortized cost		16,749,296		16,749,296
Financial assets at FVTPL (Equity securities)	FVTPL		47,304		47,304
AFS financial assets (Equity securities)	FVTPL		1,273,498		1,274,716
AFS financial assets (Equity securities)	FVTOCI		850,207		850,207
Loans and receivables (Loans)	FVTPL		279,032		280,001
Loans and receivables (Loans)	Amortized cost		253,014,491		253,014,491
Loans and receivables (Other financial assets)	Amortized cost		6,772,088		6,772,088
Total financial assets except derivatives			303,765,995		303,782,301

Among the financial assets measured at amortized cost, loans and receivables and held-to-maturity financial assets amounting to 279,032 million Won and AFS financial assets amounting to 1,320,353 million Won would be reclassified to FVTPL financial assets as a result of adopting IFRS 9.

b) Classification and Measurement of Financial Liabilities

According to the IFRS 9, the amount of changes in the fair value of financial liabilities measured at FVTPL due to changes in credit risk is presented as part of other comprehensive income, and such amount is not recycled subsequently in profit or loss. However, when recognizing the fair value changes in other comprehensive income causes or magnifies accounting discrepancies, the amount is recognized in profit or loss instead.

As of year-end the Group holds financial liabilities amounting to 294,809,262 million Won, and out of this amount 251,796 million Won has been designated as FVTPL financial liabilities. In relation to these financial liabilities, the increase in fair value amounting to 31,275 million Won has been recognized as losses for the year ended 2017 in accordance with IAS 39.

The results of the analysis conducted to determine the financial impact of applying IFRS 9 on FVTPL financial liabilities as of year-end show that the cumulative changes in fair value of FVTPL financial liabilities as a result of changes in credit risk amounted to 133 million Won.

c) Impairment: Financial assets and Contract assets

IFRS 9 requires the recognition of allowance for expected credit losses for debt instruments, lease receivables, contract assets, loan commitments and financial guarantee contracts measured at either amortized cost or FVTOCI.

The allowance to be recognized under IFRS 9 is the amount of expected 12-month credit loss or the expected lifetime credit loss, according to the 3 stages of credit risk deterioration since initial recognition as shown below.

	Stage 1	Stage 2	Stage 3
	Credit risk has not significantly increased since initial recognition(*)	Credit risk has significantly increased since initial recognition	Credit has been impaired
Allowance for expected credit losses	Expected 12-month credit losses: Expected credit losses due to possible defaults on financial instruments within 12-month period from the year-end.	Expected lifetime credit losses: Expected credit losses from all possible defaults during the expected lifetime of the financial instruments.

(*) Credit risk may be considered to not have been significantly increased when credit risk is low at the reporting date. The Group considers that a financial asset’s credit risk is low when its credit risk rating is equivalent to the generally understood definition of “investment grade”.

Meanwhile, for purchased or originated credit impaired assets, the allowance for expected credit losses per IFRS 9 is the amount of cumulative changes in the expected lifetime credit losses after its initial recognition.

Determining a significant increase in credit risk since initial recognition

The Group assess when a significant increase in credit risk has occurred based on quantitative and qualitative assessments. For the financial assets subject to the impairment provision of IFRS 9, it is considered to have a significant increase in credit risk and are moved to stage 2 when the following indicator exists:

• Credit rating decrease by more than the agreed threshold relative to the credit rating at initial recognition

• Accounts that is classified as precautious level defined by Financial Supervisory Service

• Borrower has financial difficulties or has early warning signal as defined by the Group

• Backstop criteria—accounts that are 30 calendar days or more past due.

Forward-looking information

Credit losses are the expected cash shortfalls from what is contractually due over the expected life of the financial instrument, discounted at the original effective interest rate. Expected credit losses (ECL) are the unbiased probability-weighted credit losses determined by evaluating a range of possible outcomes and considering future economic conditions. The Group incorporated forward-looking information by using statistical analysis on various macroeconomic variables. The Group has integrated such results in modelling probability of default (PD)

Modeling techniques

ECL are calculated by multiplying three main components, being the PD, loss given default and the exposure at default, discounted at the original effective interest rate. ECL is measured at the individual financial instrument level, however a collective approach where financial instruments with similar risk characteristics are grouped together, with apportionment to individual financial instruments, is used where effects can only be seen at collective level.

For the IFRS 9 impairment assessment, the Group developed models are used to determine the probability of default, loss given default and exposure at default. For stage 2 and 3, the Group applies lifetime PDs but uses 12 month PDs for stage 1. The ECL drivers of PD, exposure at default and loss given default are modelled at an account level which considers historical data available by the Group.

As of year-end the Group holds loans and receivables amounting to 267,106,204 million Won in accordance with IAS 39. In relation to this amount, the Group has recognized allowance for credit losses amounting to 1,830,242 million Won.

The expected impact on the allowance for credit losses as of year-end using the Group’s system for allowances is as follows.

(Unit : Korean Won in millions)

	Allowance for credit losses per IAS 39 (A)		Allowance for credit losses per IFRS 9 (B)		Increases(B-A)
Deposits		2,458		3,092		634
Debt securities		—		9,331		9,331
AFS debt securities		—		4,253		4,253
Held-to-maturity debt securities		—		5,078		5,078
Loan receivables and other financial assets		1,827,785		2,075,752		247,967
Guarantees		183,247		192,376		9,129
Loan commitments		66,115		104,887		38,772
Total		2,079,605		2,385,438		305,833

d) Hedge accounting

The requirements for hedge accounting in IFRS 9 has become more lenient as compared to IAS 39. That is, more financial instruments may now be considered to be a hedged item and/or a hedging instrument, the quantitative basis for evaluating high hedge effectiveness (80~125%) has been abolished, and the retroactive assessment requirement has also been abolished. These allow the firms to concentrate on hedging activities.

There are no significant impacts to the Group’s financial statements related to hedge accounting as a result of adopting IFRS 9.

e) Effect on regulatory capital ratios

Based on the analysis on IFRS 9, there are no significant impacts to the regulatory capital ratios.

Enactments to IFRS 15—Revenue from Contracts with Customers

The core principle under IFRS 15 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendments introduces a 5-step approach to revenue recognition and measurement: 1) Identify the contract with a customer, 2) Identify the performance obligations in the contract, 3) Determine the transaction price, 4) Allocate the transaction price to the performance obligations in the contract, 5) Recognize revenue when (or as) the entity satisfies a performance obligation. This standard will supersede IAS 11—Construction Contracts, IAS 18- Revenue, IFRIC 13—Customer Loyalty Programmes, IFRIC 15—Agreements for the Construction of Real Estate, IFRIC 18—Transfers of Assets from Customers, and SIC 31—Revenue-Barter Transactions Involving Advertising Services. The enactment is effective for annual periods beginning on or after 1 January 2018. The Group does not expect the enactments to have a significant impact on the consolidated financial statements.

Enactments to IFRS 16—Leases

IFRS 16 introduces a comprehensive model for the identification of lease arrangements and accountings treatments for both lessors and lessees. IFRS 16 will supersede the current lease guidance including IAS 17 Leases and the related interpretations. The enactments are effective for annual periods beginning on or after 1 January 2019.

IFRS 16 distinguishes leases and service contracts on the basis of whether an identified asset is controlled by a customer. Distinctions of operating leases and finance leases are removed for lessee accounting and is replaced by model where a right-of-use asset and corresponding liability have to be recognized for all leases by lessees except for short-term leases and leases of low value assets.

The right-of-use asset is initially measured at cost and subsequently measured at cost (subject to certain exceptions) less accumulated depreciation and impairment losses, adjusted for any remeasurement of the lease liability. The lease liability is initially measured at the present value of the lease payments that are not paid at that date. Subsequently, the lease liability is adjusted for interest and lease payments, as well as the impact of lease modifications, amongst others. Furthermore, the classification of cash flows will also be affected as operating lease payments under IAS 17 are presented as operating cash flows; whereas under the IFRS 16 model, the lease payments will be split into a principal and an interest portion which will be presented as financing and operating cash flows respectively.

In contrast to lessee accounting, IFRS 16 substantially carries forward the lessor accounting requirements in IAS 17, and continues to require a lessor to classify a lease either as an operating lease or a finance lease. Furthermore, extensive disclosures are required by IFRS 16.

In contrast, 1) for finance leases where the Group is a lessee and 2) in cases where the Group is a lessor, the Group do not anticipate that the application of IFRS 16 will have a significant impact on the amounts recognized in the Group’s consolidated financial statements.

Amendments to IFRS 2—Share-based Payment

The amendments include: 1) when measuring the fair value of share-based payment, the effects of vesting and non-vesting conditions on the measurement of cash-settled share-based payment should be consistent with the measurement of equity-settled share-based payment, 2) Share-based payment transaction in which the Group settles the share-based payment arrangement net by withholding a specified portion of the equity instruments per statutory tax withholding requirements would be classified as equity-settled in its entirety, if otherwise would be classified as equity-settled without the net settlement feature, and 3) when a cash-settled share-based payment changes to an equity-settled share-based payment because of modifications of the terms and conditions, the original liability recognized is derecognized and the equity-settled share-based payment is recognized at the modification date fair value. Any difference between the carrying amount of the liability at the modification date and the amount recognized in equity at the same date would be recognized in profit and loss immediately. The amendments are effective for annual periods beginning on or after January 1, 2018. The Group does not expect the amendments to have a significant impact on the consolidated financial statements.

Amendments to IAS 40—Transfers of Investment Property

The amendments clarify that a transfer to, or from, investment property necessitates an assessment of whether a property meets, or has ceased to meet, the definition of investment property, supported by observable evidence that a change in use has occurred. The amendments further clarify that situations other than the ones listed in IAS 40 may evidence a change in use, and that a change in use is possible for properties under construction (i.e. a change in use is not limited to completed properties).

The amendments are effective for annual periods beginning on or after January 1, 2018 with earlier application permitted. Entities can apply the amendments either retrospectively (if this is possible without the use of hindsight) or prospectively. The Group does not expect the amendments to have a significant impact on the consolidated financial statements.

Enactments to IFRIC 22—Foreign Currency Transactions and Advance Consideration

The interpretation addresses how to determine the ‘date of transaction’ for the purpose of determining the exchange rate to use on initial recognition of an asset, expense or income, when consideration for that item has been paid or received in advance in a foreign currency which resulted in the recognition of a non-monetary asset or non-monetary liability (e.g. a non-refundable deposit or deferred revenue).

The interpretation specifies that the date of transaction is the date on which the entity initially recognizes the non-monetary asset on non-monetary liability arising from the payment or receipt of advance consideration. If there are multiple payments or receipts in advance, the interpretation requires an entity to determine the date of transaction for each payment or receipt of advance consideration. The Group does not expect the enactments to have a significant impact on the consolidated financial statements.

The interpretation is effective for annual periods beginning on or after January 1, 2018 with earlier application permitted. Entities can apply the interpretation either retrospectively or prospectively. Specific transition provisions apply to prospective application.

(2) Basis of consolidated financial statement presentation

The consolidated financial statements incorporate the financial statements of the Bank and its subsidiaries (including structured entities) controlled by the Bank (the “Group”). The Group determines that the Group controls an investee if the Group has all the following: 1) power over the investee, 2) exposure, or rights, to variable returns from its involvement with the investee, 3) the ability to use its power over the investee to affect the amount of the investor’s returns. The Group reassesses whether or not it controls an investee if facts and circumstances indicate that there are changes to one or more of the three elements of control listed above.

When the Group has less than a majority of the voting rights of an investee, it still has the power over the investee if the voting rights are sufficient to give it the practical ability to direct the relevant activities of the investee unilaterally.

The Group considers all relevant facts and circumstances in assessing whether or not the Group’s voting rights in an investee are sufficient to give it power, including:

• The size of the Group’s holding of voting rights relative to the size and dispersion of holdings of the other vote holders;

• Potential voting rights held by the Group, other vote holders or other parties;

• Rights arising from other contractual arrangements; or

• Any additional facts and circumstances that indicate that the Group has, or does not have, the current ability to direct the relevant activities at the time that decisions need to be made, including voting patterns at previous shareholders’ meetings.

Income and expenses of subsidiaries acquired or disposed of during the year are included in the consolidated statements of comprehensive income from the effective date of acquisition or up to the effective date of disposal, respectively, as appropriate. The carrying amount of non-controlling interests is adjusted to reflect their proportional share of changes in equity subsequent to the initial recognition. Total comprehensive income of subsidiaries is attributed to the owners of the Group and the non-controlling interests even if this result in the non-controlling interests has a deficit balance.

When necessary, adjustments are made to the financial statements of subsidiaries to bring their accounting policies in line with those adopted by the Group.

All intra-group transactions, related assets and liabilities, income and expenses are eliminated in full on consolidation.

Changes in the Group’s ownership interests in subsidiaries, without a loss of control, are accounted for as equity transactions. The carrying amounts of the owners’ interests and the non-controlling interests are adjusted to reflect the changes in their relative interests in the subsidiaries. Any difference between the adjusted non-controlling interests and the fair value of the consideration paid or received is recognized directly in equity and attributed to owners of the Group.

When the Group loses control of a subsidiary, the profit or loss on disposal is calculated as the difference between (i) the aggregate of the fair value of the consideration received and the fair value of any retained interest and (ii) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling interests. When the assets of the subsidiary are carried at revalued amounts or fair values and the related cumulative gain or loss has been recognized in other comprehensive income and accumulated in equity, the amounts previously recognized in other comprehensive income and accumulated in equity are accounted for as if the Group had directly disposed of the relevant assets (i.e. reclassified to net income or transferred directly to retained earnings). The fair value of any investment retained in the former subsidiary at the date when control is lost is recognized as the fair value on initial recognition for subsequent accounting under IAS 39 Financial Instruments: Recognition and Measurement or, when applicable, the cost on initial recognition of an investment in an associate or a joint venture.

(3) Business combinations

Acquisitions of subsidiaries and businesses are accounted for using the acquisition method. The consideration transferred in a business combination is measured at fair value, which is calculated as the sum of the acquisition-date fair values of the assets transferred by the Group, liabilities assumed by the Group to the former owners of the acquiree and the equity interests issued by the Group in exchange for control of the acquiree. Acquisition-related costs are generally recognized in net income as incurred.

At the acquisition date, the acquiree’s identifiable assets, liabilities and contingent liabilities that meet the condition for recognition under IFRS 3 are recognized at their fair value, except that:

• deferred tax assets or liabilities and assets or liabilities related to employee benefit arrangements are recognized and measured in accordance with IAS 12 Income Taxes and IAS 19 Employee Benefits, respectively;

• liabilities or equity instruments related to share-based payment arrangements of the acquiree or share-based payment arrangements of the Group entered into to replace share-based payment arrangements of the acquiree are measured in accordance with IFRS 2 Share-based Payment at the acquisition date; and

• non-current assets (or disposal groups) that are classified as held for sale in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations are measured at the lower of their previous carrying amounts and fair value less costs to sell.

Any excess of the sum of the consideration transferred, the amount of any non-controlling interest in the acquiree and the fair value of the Group’s previously held equity interest (if any) in the acquiree over the net of identifiable assets and liabilities assumed of the acquiree at the acquisition date is recognized as goodwill which is included in intangible assets.

If, after reassessment, the Group’s interest in the fair value of the acquiree’s identifiable net assets exceeds the sum of the consideration transferred, the amount of any non-controlling interest in the acquiree and the fair value of the acquirer’s previously held equity interest in the acquiree (if any), the excess is recognized immediately in net income as a bargain purchase gain.

Non-controlling interests that are present ownership interests and entitle their holders to a proportionate share of the entity’s net assets in the event of liquidation may be initially measured either at fair value or at the non-controlling interests’ proportionate share of the recognized amounts of the acquiree’s identifiable net assets. The choice of measurement basis is made on a transaction-by-transaction basis. Other types of non-controlling interests are measured at fair value or, when applicable, on the basis specified in another IFRSs.

When the consideration transferred by the Group in a business combination includes assets or liabilities resulting from a contingent consideration arrangement, the contingent consideration is measured at its acquisition-date fair value and included as part of the consideration transferred in a business combination. Changes in the fair value of the contingent consideration that qualify as measurement period adjustments are adjusted retrospectively, with corresponding adjustments against goodwill. Measurement period adjustments are adjustments that arise from additional information obtained during the ‘measurement period’ (which cannot exceed one year from the acquisition date) about facts and circumstances that existed at the acquisition date.

The subsequent accounting for changes in the fair value of the contingent consideration that do not qualify as measurement period adjustments depends on how the contingent consideration is classified. Contingent consideration that is classified as equity is not remeasured at subsequent reporting dates and its subsequent settlement is accounted for within equity. Contingent consideration that is classified as an asset or a liability is remeasured at subsequent reporting dates in accordance with IAS 39 Financial Instruments: Recognition and Measurement, or IAS 37 Provisions, Contingent Liabilities and Contingent Assets, as appropriate, with the corresponding gain or loss being recognized in profit or loss.

When a business combination is achieved in stages, the Group’s previously held equity interest in the acquiree is remeasured at fair value at the acquisition date (i.e. the date when the Group obtains control) and the resulting gain or loss, if any, is recognized in net income. Amounts arising from changes in value of interests in the acquiree prior to the acquisition date that have previously been recognized in other comprehensive income are reclassified to net income where such treatment would be appropriate if that interest were disposed of.

In case where i) a common entity ultimately controls over all participating entities, or businesses, in business combination transaction, prior to and after the transaction continuously, and ii) the control is not temporary, the transaction meets the definition of “business combination under common control” and it is deemed that the transaction only results in the changes in legal substance, not economic substance, from the perspective of the ultimate controlling party. Thus, in such transactions, the acquirer recognizes the assets and liabilities of the acquiree on its financial statements at the book values as recognized in the ultimate controlling party’s consolidated financial statements, and the difference between the book value of consideration transferred to and the book value of net assets transferred in is recognized as equity.

(4) Investments in joint ventures and associates

An associate is an entity over which the Group has significant influence. Significant influence is the power to participate in making decision on the financial and operating policy of the investee but is not control or joint control over those policies.

A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement have rights to net assets relating to the arrangement. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control.

The net income of current period and the financial results of the joint ventures and associates are incorporated in these consolidated financial statements using the equity method of accounting, except when the investment is classified as held for sale, in which case it is accounted for in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations. Under the equity method, an investment in the joint ventures and associates is initially recognized in the consolidated statements of financial position at cost and adjusted thereafter to recognize the Group’s share of the net assets of the joint ventures and associates and any impairment. When the Group’s share of losses of the joint ventures and associates exceeds the Group’s interest in the associate (including any long term interests that, in substance, form part of the entity’s net investment in the associate or joint venture), the Group discontinues recognizing its share of further losses. Additional losses are recognized only to the extent that the Group has incurred legal or constructive obligations or made payments on behalf of the joint ventures and associates.

Any excess of the cost of acquisition over the Group’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities of the joint ventures and associates recognized at the date of acquisition is recognized as goodwill, which is included within the carrying amount of the investment. Any excess of the Group’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities over the cost of acquisition is recognized immediately in net income.

Upon a loss of significant influence over the joint ventures and associates, the Group discontinues the use of the equity method and measures at fair value of any investment that the Group retains in the former joint ventures and associates from the date when the Group loses significant influence. The fair value of the investment is regarded as its fair value on initial recognition as a financial asset in accordance with IAS 39 Financial Instruments; Recognition and Measurement. The Group recognized differences between the carrying amount and fair value in net income and it is included in determination of the gain or loss on disposal of joint ventures and associates. The Group accounts for all amounts recognized in other comprehensive income in relation to that joint ventures and associates on the same basis as would be required if the joint ventures and associates had directly disposed of the related assets or liabilities. Therefore, if a gain or loss previously recognized in other comprehensive income by an associate would be reclassified to net income on the disposal of the related assets or liabilities, the Group reclassifies the gain or loss from equity to net income as a reclassification adjustment.

When the Group’s ownership of interest in an associate or a joint venture decreases but the Group continues to maintain significant influence over an associate or a joint venture, the Group reclassifies to profit or loss the proportion of the gain or loss that had previously been recognized in other comprehensive income relating to that decrease in ownership interest if the gain or loss would be reclassified to profit or loss on the disposal of the related assets or liabilities. Meanwhile, if interest on associate or joint venture meets the definition of non-current asset held for sale, it is accounted for in accordance with IFRS 5.

The requirements of IAS 39 Financial Instruments: Recognition and Measurement to determine whether there has been a loss event are applied to identify whether it is necessary to recognize any impairment loss with respect to the Group’s investment in the joint ventures and associates. When necessary, the entire carrying amount of the investment (including goodwill) is tested for impairment in accordance with IAS 36 Impairment of Assets as a single asset by comparing its recoverable amount (higher of value in use and fair value less costs to sell) with its carrying amount. Any impairment loss recognized is not allocated to any asset (including goodwill), which forms part of the carrying amount of the investment. Any reversal of that impairment loss is recognized in accordance with IAS 36 to the extent that the recoverable amount of the investment subsequently increases.

The Group continues to use the equity method when an investment in an associate becomes an investment in a joint venture or an investment in a joint venture becomes an investment in an associate. There is no remeasurement to fair value upon such changes in ownership interests.

When a subsidiary transacts with an associate or a joint venture of the Group, profits and losses resulting from the transactions with the associate or joint venture are recognized in the Group’s consolidated financial statements only to the extent of interests in the associate or joint venture that are not related to the Group.

(5) Investment in joint operation

A joint operation is a joint arrangement whereby the parties that have joint control of the arrangement have rights to the assets, and obligations for the liabilities, relating to the arrangement. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control.

When the Group operates as a joint operator, it recognizes in relation to its interest in a joint operation:

(a) its assets, including its share of any assets held jointly;

(b) its liabilities, including its share of any liabilities incurred jointly;

(c) its revenue from the sale of its share of the output arising from the joint operation;

(d) its share of the revenue from the sale of the output by the joint operation; and

(e) its expenses, including its share of any expenses incurred jointly.

The Group accounts for the assets, liabilities, revenues and expenses relating to its interest in a joint operation in accordance with the IFRSs applicable to the particular assets, liabilities, revenues and expenses.

When the Group enters into a transaction with a joint operation in which it is a joint operator, such as a sale or contribution of assets, it is conducting the transaction with the other parties to the joint operation and, as such, the Group recognizes gains and losses resulting from such a transaction only to the extent of the other parties’ interests in the joint operation.

When the Group enters into a transaction with a joint operation in which it is a joint operator, such as a purchase of assets, it does not recognize its share of the gains and losses until it resells those assets to a third party.

(6) Revenue recognition

1) Interest income

Interest income is recognized when earned. Interest income on financial assets that are classified as loans and receivables, available-for-sale or held-to-maturity is determined using the effective interest method.

The effective interest method is a method of calculating the amortized cost of a financial asset (or group of financial assets) and of allocating the interest income over the expected life of the asset. The effective interest rate is the rate that exactly discounts estimated future cash flows to the instrument’s initial carrying amount. Calculation of the effective interest rate takes into account fees payable or receivable that is an integral part of the instrument’s yield, premiums or discounts on acquisition or issue, early redemption fees and transaction costs. All contractual terms of a financial instrument are considered when estimating future cash flows.

2) Loan origination fees and costs

The commission fees earned on loans, which is part of the effective interest rate of loans, is accounted for as deferred origination fees. Incremental cost related to the acquisition or disposal is accounted for deferred origination costs, and it is amortized on the effective interest method and included in interest revenues on loans.

3) Fees and commissions income

Commitment and utilization fees are determined as a percentage of the outstanding facility. If it is unlikely that a specific lending arrangement will be entered into, such fees are taken to net income over the life of the facility, otherwise, they are deferred and included in the effective interest rate on the advance.

Fees in respect of services are recognized as the right to consideration accrues through the provision of the service to the customer. The arrangements are generally contractual and the cost of providing the service is incurred as the service is rendered. The price is usually fixed and determinable.

Credit card fees include commission received from merchants for processing credit card transaction and annual fees received from credit card holders. Revenue from the commission is accrued to net income when the service is performed and annual fee is deferred and recognized as income over the period of the service provided.

4) Trust fees and compensation related to trust accounts

The Group receives fees for its management of unconsolidated trust assets, which are recognized on an accrual basis when the management services are provided and earned. The Group also is entitled to receive performance-based fees for certain trust accounts. These performance-based fees are recognized at the end of the performance period. In addition, a certain trust account which the Group guarantees to repay the principals and minimum interests of the trust account to its beneficiaries shall be included in the consolidated financial statements. The Group recognizes incomes when earned and expenses when interests to be paid to beneficiaries are accrued.

(7) Accounting for foreign currencies

The Group’s consolidated financial statements are presented in Korean Won, which is the functional currency of the Bank. At the end of each reporting period, monetary assets and liabilities denominated in foreign currencies are translated to the functional currency at its prevailing exchange rates at the date. Foreign exchange differences on monetary items that qualify as hedging instruments in a cash flow hedge or that form part of net investment in foreign operations are recognized in equity.

A monetary available-for-sale (“AFS”) financial asset is treated as if it were carried at amortized cost in the foreign currency. Accordingly, for such financial assets, exchange differences resulting from retranslating amortized cost are recognized in net income.

Non-monetary items denominated in foreign currencies that are stated at fair value are translated into Korean Won at foreign exchange rates at the dates the values were determined. Translation differences arising on non-monetary items measured at fair value are recognized in net income except for differences arising on non-monetary AFS financial assets, for example equity shares, which are included in the AFS reserve in equity unless the asset is the hedged item in a fair value hedge.

The Group identifies the most appropriate functional currency for each foreign operation based on the foreign operation’s activities. If Korean Won is not the foreign operation’s functional currency, its assets and liabilities, including goodwill and fair value adjustments arising on acquisition, are translated into Korean Won at foreign exchange rates at the end of each reporting date while the revenues and expenses are translated into Korean Won at average exchange rates for the period unless these do not approximate to the foreign exchange rates at the dates of the transactions. Foreign exchange differences arising on the translation of a foreign operation are recognized directly in equity and included in net income on its disposal.

(8) Cash and cash equivalents

Cash and cash equivalents consist of cash on hand, demand deposits, interest-earning deposits with original maturities of up to 90 days of acquisition date and highly liquid investment assets that are readily convertible to known amounts of cash and subject to an insignificant risk of changes in value.

(9) Financial assets and financial liabilities

1) Financial assets

A regular way purchase or sale is a purchase or sale of a financial asset under a contract whose term requires delivery of the asset within the time frame established generally by regulation or convention in the marketplace concerned.

On initial recognition, financial assets are classified into held-for-trading, designated as at fair value through profit or loss (“FVTPL”), AFS financial assets, held-to-maturity (“HTM”) investments and loans and receivables. Regular way purchases of financial assets classified as loans and receivables are recognized on settlement date; all other regular way transactions in financial assets are recognized on trade date.

a) Held-for-trading:

A financial asset is classified as held-for-trading if it is acquired principally for sale in the near term, or forms part of a portfolio of financial instruments that are managed together and for which there is evidence of short-term profit taking, or it is a derivative (not in a qualifying hedge relationship). Held-for-trading financial assets are recognized at fair value with transaction costs being recognized in net income. Subsequently they are measured at fair value. Gains and losses on held-for-trading financial assets are recognized in net income as they arise.

b) Designated as at FVTPL:

Financial assets may be designated as at FVTPL only if such designation (a) eliminates or significantly reduces a measurement or recognition inconsistency; (b) applies to a group of financial assets, financial liabilities or both, which is managed and performance is evaluated on a fair value basis; or (c) is related to a contract containing one or more embedded derivative that would be required to be separated from the host contract.

Financial assets designated by the Group on initial recognition as at FVTPL are recognized at fair value, with transaction costs recognized in net income, and are subsequently measured at fair value. Gains and losses on financial assets that are designated as at FVTPL are recognized in net income as they arise.

c) AFS financial assets:

Financial assets that are not classified as HTM; held-for-trading; designated as at FVTPL; or loans and receivables, are classified as AFS. Financial assets can be designated as AFS on initial recognition. AFS financial assets are initially recognized at fair value plus directly related transaction costs. They are subsequently measured at fair value. Unquoted equity investments whose fair value cannot be measured reliably are carried at cost and classified as AFS financial assets. Impairment losses in monetary and non-monetary AFS financial assets and dividends on non-monetary financial assets are recognized in net income. Interest revenue on monetary financial assets is calculated using the effective interest method and recognized as a net income. Changes in the fair value of AFS financial assets other than those resulting from retranslation of monetary AFS at the reporting date, and any related tax are reported in a separate component of shareholders’ equity until disposal, and then the cumulative gain or loss is recognized in net income.

d) HTM investments:

A financial asset may be classified as a HTM investment only if it has fixed or determinable payments, a fixed maturity, and the Group has the positive intention and ability to hold the financial asset to maturity. HTM investments are initially recognized at fair value plus directly related transaction costs. They are subsequently measured at amortized cost using the effective interest method less any impairment losses.

e) Loans and receivables:

Non-derivative financial assets with fixed or determinable repayments that are not quoted in an active market are classified as loans and receivables, except those that are classified as AFS or as held-for-trading, or designated as at FVTPL. Loans and receivables are initially recognized at fair value plus directly related transaction costs. They are subsequently measured at amortized cost using the effective interest method less any impairment losses. Interest income is recognized using the effective interest method, except for the short-term receivables to which the present value discount is not meaningful.

2) Financial liabilities

On initial recognition financial liabilities are classified into held-for-trading; designated as at FVTPL; or amortized cost. Issues of equity or financial liabilities measured at amortized cost are recognized on settlement date; all other regular way transactions in financial instruments are recognized on trade date.

a) Held-for-trading:

A financial liability is classified as held-for-trading if it is incurred principally for repurchase in the near term, or forms part of a portfolio of financial instruments that are managed together and for which there is an evidence of short-term profit taking, or it is a derivative (not in a qualifying hedge relationship). Held-for-trading financial liabilities are recognized at fair value with transaction costs being recognized in net income. Subsequently, they are measured at fair value. Gains and losses are recognized in net income as they arise.

b) Designated as at FVTPL:

Financial liabilities may be designated as at FVTPL only if such designation (a) eliminates or significantly reduces a measurement or recognition inconsistency; (b) applies to a group of financial liabilities or both that the Group manages and evaluates on a fair value basis; or (c) relates to an instrument that contains an embedded derivative which is not evidently closely related to the host contract. Financial liabilities that the Group designates on initial recognition as being at FVTPL are recognized at fair value, with transaction costs being recognized in net income, and are subsequently measured at fair value. Gains and losses on financial liabilities that are designated as at FVTPL are recognized in net income as they arise.

c) Amortized cost:

All other financial liabilities are measured at amortized cost using the effective interest method.

3) Reclassifications

Held-for-trading and AFS financial assets that meet the definition of loans and receivables (non-derivative financial assets with fixed or determinable payments that are not quoted in an active market) may be reclassified to loans and receivables if the Group has the intention and ability to hold the financial asset for the foreseeable future or until maturity. The Group typically regards the foreseeable future as twelve months from the date of reclassification. Reclassifications are made at fair value. This fair value becomes the asset’s new cost or amortized cost as appropriate. Gains and losses recognized up to the date of reclassification are not reversed.

4) Derecognition of financial assets and liabilities

The Group derecognizes a financial asset when the contractual right to the cash flows from the asset is expired, or when it transfers the financial asset and substantially all the risks and rewards of ownership of the asset to another company. If the Group neither transfers nor retains substantially all the risks and rewards of ownership and continues to control the transferred asset, the Group recognizes its retained interest in the asset and an associated liability for amounts it may have to pay. If the Group retains substantially all the risks and rewards of ownership of a transferred financial asset, the Group continues to recognize the financial asset and also recognizes a collateralized borrowing for the proceeds received.

On derecognition of a financial asset in its entirety, the difference between the asset’s carrying amount and the sum of the consideration received and receivable and the cumulated gain or loss that had been recognized in other comprehensive income and accumulated in equity is recognized in profit or loss.

On derecognition of a financial assets other than in its entirety (e.g. when the Group retains an option to repurchase part of a transferred asset, or it retains a residual interest and such an retained interest indicates that the transferor has neither transferred nor retained substantially all the risks and rewards of ownership and has retained control of the transferred asset), the Group allocates the previous carrying amount of the financial asset between the part it continues to recognize under continuing involvement, and the part it no longer recognizes on the basis of the relative fair value of those parts on the date of the transfer. The difference between the carrying amount allocated to the part that is no longer recognized and the sum of the consideration received for the part that is no longer recognized and any cumulative gain or loss allocated to it that had been recognized in other comprehensive income is recognized in profit or loss. A cumulative gain or loss that had been recognized in other comprehensive income is allocated between the part that continues to be recognized and the part that is no longer recognized on the basis of the relative fair value of those parts.

The Group derecognizes the financial liability, when Group’s obligations are discharged, cancelled or expired. The difference between paid cost and the carrying amount of financial liabilities is recorded in profit or loss.

5) Fair value of financial assets and liabilities

Financial instruments classified as held-for-trading or designated as at FVTPL and financial assets classified as AFS are recognized in the financial statements at fair value. All derivatives are measured at fair value.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in and orderly transaction between market participants at the measurement date. Fair values are determined from quoted prices in active markets for identical financial assets or financial liabilities where these are available. The Group characterizes active markets as those in which transactions for the asset or liability take place with sufficient frequency and volume to provide pricing information on an ongoing basis.

Where a financial instrument is not in active market characterized by low transaction volumes, price quotations which vary substantially among market participants, or in which minimal information is released publicly, fair values are established using valuation techniques relying on alternative market data or internally developed models using significant inputs that are generally readily observable from objective sources. Market data includes prices of financial instruments with similar maturities and characteristics, duration, interest rate yield curves, and measures of volatility. The amount determined to be fair value may incorporate the management of the Group’s own assumptions (including assumptions that the Group believes market participants would use in valuing the financial instruments and assumptions relating to appropriate risk adjustments for nonperformance and lack of marketability).

The valuation techniques used to estimate the fair value of the financial instruments include market approach and income approach, each of which involves a significant degree of judgment. Under the market approach, fair value is determined by reference to a recent transaction involving the financial instruments or by reference to observable valuation measures for comparable companies or assets.

Under the income approach, fair value is determined by converting future amounts (e.g., cash flows or earnings) to a single present amount (discounted) using current market expectations about the future amounts. In determining value under this approach, the Group makes assumptions regarding, among other things, revenues, operating income, depreciation and amortization, capital expenditures, income taxes, working capital needs, and terminal value of the financial investments. These valuation techniques involve a degree of estimation, the extent of which depends on the instrument’s complexity and the availability of market-based data.

The following are descriptions of valuation methodologies used by the Group to measure various financial instruments at fair value.

a) Financial assets at FVTPL and AFS financial assets:

The fair value of the securities included in financial assets at FVTPL and AFS financial assets are recognized in the consolidated statements of financial position based on available quoted market prices. For debt securities traded in the OTC market, the Group generally determines fair value based on prices obtained from independent pricing services. Specifically, with respect to independent pricing services, the Group obtains three prices per instrument from reputable independent pricing services in Korea, and generally uses the lowest of the prices obtained from such services without further adjustment. For non-marketable equity securities, the Group obtains prices from the independent pricing services. The Group validates prices received from such independent pricing services using a variety of means, including verification of the qualification of the independent pricing services, corroboration of the pricing by comparing the prices among the independent pricing services and by reference to other available market data, and review of the pricing model and assumptions used by the independent pricing services by the Group’s personnel who are familiar with market-related conditions.

b) Derivative assets and liabilities:

Quoted market prices are used for the Group’s exchange-traded derivatives, such as certain interest rate futures and option contracts. All of the Group’s derivatives that are traded in OTC markets where quoted market prices are not readily available are valued using internal valuation techniques. Valuation techniques and inputs to internally developed models depend on the type of derivative and nature of the underlying rate, price or index upon which the derivative’s value is based. If the model inputs for certain derivatives are not observable in a liquid market, significant judgments on the level of inputs used for valuation techniques are required.

c) Valuation Adjustments:

By using derivatives, the Group is exposed to credit risk if counterparties to the derivative contracts do not perform as expected. If counterparty fails to perform, counterparty credit risk is equal to the amount reported as a derivative asset in the consolidated statements of financial position. The amounts reported as a derivative asset are derivative contracts in a gain position. Few of the Group’s derivatives are listed on an exchange. The majority of derivative positions are valued using internally developed models that use as their basis observable market inputs. Therefore, an adjustment is necessary to reflect the credit quality of each counterparty to arrive at fair value. Counterparty credit risk adjustments are applied to derivative assets, such as OTC derivative instruments, when the market inputs used in valuation models may not be indicative of the creditworthiness of the counterparty. Adjustments are also made when valuing financial liabilities to reflect the Group’s own credit standing.

The adjustment is based on probability of default of a counterparty and loss given default. The adjustment also takes into account contractual factors designed to reduce the Group’s credit exposure to each counterparty. To the extent derivative assets (liabilities) are subject to master netting arrangements, the exposure used to calculate the credit risk adjustment is net of derivatives in a loss (gain) position with the same counterparty and cash collateral received (paid).

6) Impairment of the financial assets

The Group assesses at the end of each reporting date whether there is any objective evidence that a financial asset or group of financial assets classified as AFS, HTM or loans and receivables is impaired. A financial asset or portfolio of financial assets is impaired and an impairment loss incurs if there is an objective evidence of impairment as result of one or more events that occurred after the initial recognition of an asset and that event (or events) has an impact on the estimated future cash flows of the financial asset.

a) Financial assets carried at amortized cost:

If there is an objective evidence that an impairment loss on a financial asset or group of financial assets classified as HTM investments or as loans and receivables has been incurred, the Group measures the amount of the loss as the difference between the carrying amount of the asset or group of assets and the present value of estimated future cash flows from the asset or group of assets discounted at the effective interest rate of the instrument at initial recognition. For collateralized loans and receivables, estimated future cash flows include cash flows that may result from foreclosure less the costs of obtaining and selling the collateral.

Impairment losses are assessed individually for financial assets that are individually significant and assessed either individually or collectively for assets that are not individually significant. In making collective assessment of impairment, financial assets are grouped into portfolios on the basis of similar risk characteristics. Future cash flows from these portfolios are estimated on the basis of the contractual cash flows and historical loss experience for assets with similar credit risk characteristics. Historical loss experience is adjusted, on the basis of observable data, to reflect current conditions not affecting the period of historical experience.

Impairment losses are recognized in net income and the carrying amount of the financial asset or group of financial assets is reduced by establishing a provision for impairment losses. If, in a subsequent period, the amount of the impairment loss reduces and the reduction can be ascribed to an event after the impairment was recognized, the previously recognized loss is reversed by adjusting the provision. Once an impairment loss has been recognized on a financial asset or group of financial assets, interest income is recognized on the carrying amount using the rate of interest at which estimated future cash flows were discounted in measuring impairment.

It is not the Group’s usual practice to write-off the asset at the time an impairment loss is recognized. Impaired loans and receivables are written off (i.e. the impairment provision is applied in writing down the loan’s carrying value in full) when the Group concludes that there is no longer any realistic prospect of recovery of part or the entire loan. Amounts recovered after a loan has been written off are reflected to the provision for the period in which they are received.

b) Financial assets carried at fair value:

When a decline in the fair value of a financial asset classified as AFS has been recognized directly in other comprehensive income and there is an objective evidence that the asset is impaired, the cumulative loss is removed from other comprehensive income and recognized in net income. The loss is measured as the difference between the amortized cost of the financial asset and its current fair value. Impairment losses on AFS equity instruments are not reversed through net income, but those on AFS debt instruments are reversed, if there is a decrease in the cumulative impairment loss that is objectively related to a subsequent event.

(10) Offsetting financial instruments

Financial assets and liabilities are presented in net in the consolidated statements of financial position when the Group has an enforceable legal right to set off and an intention to settle on a net basis or to realize an asset and settle the liability simultaneously.

(11) Investment properties

The Group classifies a property held to earn rentals and/or for capital appreciation as an investment property. Investment properties are measured initially at cost, including transaction costs, less subsequent depreciation and impairment.

Subsequent costs are included in the carrying amount of the asset or recognized as a separate asset if it is probable that future economic benefits associated with the assets will flow into the Group and the cost of an asset can be measured reliably. Routine maintenance and repairs are expensed as incurred.

While land is not depreciated, all other investment properties are depreciated based on the respective assets’ estimated useful lives using the straight-line method. The estimated useful lives, residual values and depreciation method are reviewed at the end of each reporting period, with the effect of any change in estimate accounted for on a prospective basis.

An investment property is derecognized from the consolidated financial statements on disposal or when it is permanently withdrawn from use and no future economic benefits are expected even from its disposal. The gain or loss on derecognition of an investment property is calculated as the difference between the net disposal proceeds and the carrying amount of the property and is recognized in profit or loss in the period of the derecognition.

(12) Premises and equipment

Premises and equipment are stated at cost less subsequent accumulated depreciation and accumulated impairment losses. The cost of an item of premises and equipment is directly attributable to their purchase or construction, which includes any costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management. It also includes the initial estimate of the costs of dismantling and removing the item and restoring the site on which it is located.

Subsequent costs to replace part of the premises and equipment are recognized in carrying amount of an asset or as an asset if it is probable that the future economic benefits associated with the assets will flow into the Group and the cost of an asset can be measured reliably. Routine maintenance and repairs are expensed as incurred.

While land is not depreciated, for all other premises and equipment, depreciation is charged to net income on a straight-line basis on the estimated economic useful lives as follows:

	Useful life
Buildings used for business purpose	35 to 57 years
Structures in leased office	4 to 5 years
Properties for business purpose	4 to 5 years
Leased assets	Useful lives of the same kind or similar other premises and equipment

The Group reassesses the depreciation method, the estimated useful lives and residual values of premises and equipment at the end of each reporting period. If expectations differ from previous estimates, the changes are accounted for as a change in an accounting estimate. When the carrying amount of a fixed asset exceeds the estimated recoverable amount, the carrying amount of such asset is reduced to the recoverable amount.

(13) Intangible assets and goodwill

Intangible assets are stated at the manufacturing cost or acquisition cost plus additional incidental expenses less accumulated amortization and accumulated impairment losses. The Group’s intangible assets are amortized on a straight-line basis on the estimated economic useful lives as follows. The estimated useful life and amortization method are reviewed at the end of each reporting period. If expectations differ from previous estimates, the changes are accounted for as a change in an accounting estimate.

	Useful life
Patents	10 years
Development costs	5 years
Software and others	4 to 5 years

In addition, when an indicator that intangible assets are impaired is noted, and the carrying amount of the asset exceeds the estimated recoverable amount of the asset, the carrying amount of the asset is reduced to its recoverable amount immediately.

Goodwill acquired in a business combination is included in intangible assets. Goodwill is not amortized but tested for impairment annually to the extent of reporting unit and when there is any indication of impairment.

Goodwill acquired is allocated to each of the Group’s cash-generating units (“CGU”) expected to benefit from the synergies of the combination. A CGU to which goodwill has been allocated is tested for impairment annually, or more frequently when there is indication that the CGU may be impaired. If the recoverable amount of the CGU is less than its carrying amount, the impairment loss is allocated first to reduce the carrying amount of any goodwill allocated to the CGU and then to the other assets of the CGU on a pro-rata basis based on the carrying amount of each asset in the CGU. Any impairment loss for goodwill is recognized directly in net income in the consolidated statements of comprehensive income. An impairment loss recognized for goodwill is not reversed in subsequent periods.

(14) Impairment of non-monetary assets

Intangible assets with indefinite useful lives such as goodwill and membership, or intangible assets that are not yet available for use are tested for impairment annually, regardless of whether or not there is any indication of impairment. All other assets are tested for impairment when there is an objective indication that the carrying amount may not be recoverable, and if the indication exists. The Group estimates the recoverable amount. Recoverable amount is the higher of value in use and net fair value less costs to sell. If the recoverable amount of an asset is estimated to be less than its carrying amount, the carrying amount of the asset is reduced to its recoverable amount and such impairment loss is recognized immediately in net income.

(15) Leases

Leases are classified as finance leases whenever the terms of the lease transfer substantially all the risks and rewards of ownership to the lessee. All other leases are classified as operating leases.

1) As a lessor

Amounts due from lessees under finance leases are recognized as receivables at the amount of the Group’s net investment in the leases being the minimum lease payments and any unguaranteed residual value discount interest rate implicit in the lease. Finance lease income is allocated to accounting periods so as to reflect a constant periodic rate of return on the Group’s net investment outstanding in respect of the leases.

Rental income from operating leases is recognized on a straight-line basis over the term of the relevant lease. Initial direct costs incurred in negotiating and arranging an operating lease are added to the carrying amount of the leased asset and recognized on a straight-line basis over the lease term. Operating lease assets are included within other assets and depreciated over their useful lives.

2) As a lessee

Assets held under finance leases are initially recognized as assets of the Group at their fair value at the inception of the lease or, if lower, at the present value of the minimum lease payments. The corresponding liability to the lessor is included in the consolidated statements of financial position as a finance lease obligation. Lease payments are apportioned between finance expenses and reduction of the lease obligation so as to achieve a constant rate of interest on the remaining balance of the liability. Contingent rentals arising under finance leases are recognized as expenses in the periods in which they are incurred.

Operating lease payments are recognized as an expense on a straight-line basis over the lease term, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased asset are consumed. Contingent rentals arising under operating leases are recognized as expenses in the period in which they are incurred.

(16) Derivative instruments

Derivative instruments are classified as forward, futures, option, and swap, depending on the types of transactions and are classified as either trading or hedging depending on the purpose. Derivatives are initially recognized at fair value at the date the derivative contract is entered into and are subsequently measured to their fair value at the end of each reporting period. The resulting gain or loss is recognized in net income immediately unless the derivative is designated and effective as a hedging instrument.

A derivative embedded in a contract is accounted for as a stand-alone derivative if its economic characteristics are not closely related to the economic characteristics of the host contract; unless the entire contract is measured at fair value with changes in fair value recognized in net income.

The Group designates certain hedging instruments to (a) hedge of the exposure to changes in fair value of a recognized asset or liability or an unrecognized firm commitment (fair value hedge); (b) hedge of the exposure to variability in cash flows that is attributable to a particular risk associated with a recognized asset or liability or a highly probable forecasted transaction (cash flow hedge); and (c) hedge of a net investment in a foreign operation.

At the inception of the hedge relationship, the Group documents the relationship between the hedging instrument and the hedged item, along with its risk management objectives and its strategy for undertaking various hedge transactions. Furthermore, at the inception of the hedge and on an ongoing basis, the Group documents whether the hedging instrument is highly effective in offsetting changes in fair values or cash flows of the hedged item.

1) Fair value hedge

Changes in the fair value of derivatives that are designated and qualified as fair value hedges are recognized in net income immediately, together with any changes in the fair value of the hedged asset or liability that are attributable to the hedged risk. Hedge accounting is discontinued when the Group revokes the hedging relationship or when the hedging instrument is no longer qualified for hedge accounting. If the hedging instrument no longer meets the criteria for hedge accounting, the fair value adjustment to the carrying amount of the hedged item is amortized to net income from that date to maturity using the effective interest method.

2) Cash flow hedge

The effective portion of changes in the fair value of derivatives that are designated and qualified as cash flow hedges is recognized in other comprehensive income. The gain or loss relating to the ineffective portion is recognized immediately in net income. Amounts previously recognized in other comprehensive income and accumulated in equity are reclassified to net income when the hedged item is recognized in net income.

Hedge accounting is discontinued when the hedging instrument is expired or sold, or it is no longer qualified for hedge accounting, and any cumulative gain or loss in other comprehensive income remains in equity until the forecast transaction is ultimately recognized in net income. When a forecasted transaction is no longer expected to occur, the gain or loss accumulated in equity is recognized immediately in net income.

3) Net investment hedge

Hedges of net investments in foreign operations are accounted for similarly to cash flow hedges. The effective portion of changes in the fair value of the hedging instrument is recognized in equity while the ineffective portion is recognized immediately in net income. The cumulated gain and loss in other comprehensive income is reclassified from equity to profit or loss on the disposal or partial disposal of the foreign operations.

(17) Assets (or Disposal group) held for sale

The Group classifies a non-current asset (or disposal group) as held for sale if its carrying amount will be recovered principally through a sale transaction rather than through continuing use. For this, the non-current asset (or disposal group) must be available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such assets (or disposal groups) and its sale must be highly probable. For the sale to be highly probable, the appropriate level of management must be committed to a plan to sell the asset (or disposal group), and an active programme to locate a buyer and complete the plan must have been initiated. In addition, the sale should be expected to qualify for recognition as a completed sale within one year from the date of classification.

When the Group is committed to a sale plan involving loss of control of a subsidiary, all of the assets and liabilities of that subsidiary are classified as held for sale when the criteria described above are met, regardless of whether the Group will retain a non-controlling interest in its former subsidiary after the sale.

When the Group is committed to a sale plan involving disposal of an investment, or a portion of an investment, in an associate or joint venture, the investment or the portion of the investment that will be disposed of is classified as held for sale when the criteria described above are met, and the Group discontinues the use of the equity method in relation to the portion that is classified a held for sale. Any retained portion of an investment in an associate or a joint venture that has not been classified as held for sale continues to be accounted for using the equity method. The Group discontinues the use of the equity method at the time of disposal when the disposal results in the Group losing significant influence over the associate or joint venture.

After the disposal takes place, the Group accounts for any retained interest in the associate or joint venture in accordance with IAS 39 Financial Instruments: Recognition and Measurement unless the retained interest continues to be an associate or a joint venture, in which case the Group uses the equity method.

Non-current assets (and disposal groups) classified as held for sale are measured at the lower of their previous carrying amount and fair value less costs to sell.

(18) Provisions

The Group recognizes provision if it has a present or contractual obligations as a result of the past event, it is probable that an outflow of resources will be required to settle the obligation, and the amount of the obligation is reliably estimated. Provision is not recognized for the future operating losses.

The Group recognizes provision related to the unused portion of point rewards earned by credit card customers, payment guarantees, loan commitment and litigations. Where the Group is required to restore a leased property that is used as a branch, to an agreed condition after the contractual term expires, the present value of expected amounts to be used to dispose, decommission or repair the facilities is recognized as an asset retirement obligation.

Where there are a number of similar obligations, the probability that an outflow will be required in settlement is determined by considering the obligations as a whole. Although the likelihood of outflow for any one item may be small, if it is probable that some outflow of resources will be needed to settle the obligations as a whole, a provision is recognized.

(19) Capital and compound financial instruments

The Group classifies a financial instrument that it issues as a financial liability or an equity instrument in accordance with the substance of the contractual arrangement. An instrument is classified as a liability if it is a contractual obligation to deliver cash or another financial asset, or to exchange financial assets or financial liabilities on potentially unfavourable terms. An instrument is classified as equity if it evidences a residual interest in the assets of the Group after the deduction of liabilities. The components of a compound financial instrument issued by the Group are classified and accounted for separately as financial liabilities or equity as appropriate.

If the Group reacquires its own equity instruments, those instruments (“treasury shares”) are presented as a deduction from total equity. The gain or loss on the purchase, sale, issue, or cancellation of treasury shares is not recognized in net income but recognized directly in equity.

(20) Financial guarantee contracts

Under a financial guarantee contract, the Group, in return for a fee, undertakes to meet a customer’s obligations under the terms of a debt instrument if the customer fails to do so.

A financial guarantee is recognized as a liability; initially at fair value and will be amortized, if not designated as at FVTPL, subsequently at the higher of its initial value less cumulative amortization and any provision under the contract measured in accordance with provision policy. Amortization is calculated so as to recognize fees receivable in profit or loss over the period of the guarantee.

(21) Employee benefits and pensions

The Group recognizes the undiscounted amount of short-term employee benefits expecting payment in exchange for the services, when employee renders services. Also, the Group recognizes expenses and liabilities in the case of accumulating compensated absences, when the employees render service that increases their entitlement to future compensated absences. Though the Group may have no legal obligation to pay a bonus, considering some cases, the Group has a practice of paying bonuses. In such cases, the Group has a constructive obligation, and thus recognizes expenses and liabilities when the employees render service.

The Group is operating defined contribution retirement pension plans and defined benefit retirement pension plans. Contributions to defined contribution retirement pension plans are recognized as an expense when employees have rendered service entitling them to the contributions. For defined benefit retirement pension plans, the cost of providing benefits is determined using the Projected Unit Credit Method, with actuarial valuations being carried out at the end of each reporting period. Remeasurement, comprising actuarial gains and losses, the effect of the changes to the asset ceiling (if applicable) and the return on plan assets (excluding interest), is reflected immediately in the statement of financial position with a charge or credit recognized in other comprehensive income in the period in which they occur.

Remeasurement recognized in other comprehensive income is reflected immediately in retained earnings and will not be reclassified to profit or loss. Past service cost is recognized in profit or loss in the period of a plan amendment. Net interest is calculated by applying the discount rate at the beginning of the period to the net defined benefit liability or asset. Defined benefit costs are composed of service cost (including current service cost, past service cost, as well as gains and losses on curtailments and settlements), net interest expense (income), and remeasurement.

The Group presents the service cost and net interest expense (income) components in profit or loss, and the remeasurement component in other comprehensive income. Curtailment gains and losses are accounted for as past service costs.

The retirement benefit obligation recognized in the consolidated statement of financial position represents the actual deficit or surplus in the Group’s defined benefit plans. Any surplus resulting from this calculation is limited to the present value of any economic benefits available in the form of refunds from the plans or reductions in future contributions to the plans.

Liabilities for termination benefits are recognized at the earlier of either 1) when the Group has become not able to cancel its proposal for termination benefits, or 2) when the Group has recognized the cost of restructuring that accompanies the payment of termination benefits.

(22) Income taxes

Income tax expense represents the sum of the tax currently payable and deferred tax. Current income tax expense approximates taxes to be paid or refunded for the current period and deferred income tax expense is provided on an asset and liability method whereby deferred tax assets are recognized for deductible temporary differences, including operating losses and tax credit carryforwards, and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the carrying values of assets and liabilities for financial reporting purposes and their tax bases. Deferred income tax benefit or expense is then recognized for the change in deferred tax assets or liabilities between periods. Deferred tax assets and liabilities are measured at the tax rates on the date of enactment or substantive enactment that are expected to apply in the period in which the liability is settled or the asset realized. Deferred tax assets, including the carryforwards of unused tax losses, are recognized to the extent it is probable that the deferred tax assets will be realized.

Deferred income tax assets and liabilities are offset if, and only if the Group has a legally enforceable right to offset current tax assets against current tax liabilities, and the deferred tax assets and liabilities relate to income taxes levied by the same taxation authority on either the taxable entity or different taxable entities which intend either to settle current tax liabilities and assets on a net basis.

The carrying amount of deferred tax assets is reviewed at the end of each reporting period and reduced to the extent that it is no longer probable that sufficient taxable profits will be available to allow all or part of the asset to be recovered.

Deferred liabilities are not recognized if the temporary difference arises from goodwill. Deferred tax assets or liabilities are not recognized if they arise from the initial recognition (other than in a business combination) of other assets and liabilities in a transaction that affects neither the taxable profit nor the accounting profit.

Current and deferred tax are recognized in profit or loss, except when they relate to items that are recognized in other comprehensive income or directly in equity, in which case, the current and deferred tax are also recognized in other comprehensive income or directly in equity respectively.

(23) Earnings per share (“EPS”)

Basic EPS is calculated by earnings subtracting the dividends paid to holders of preferred stock and hybrid securities from the net income attributable to ordinary shareholders from the statements of comprehensive income and dividing by the weighted average number of common shares outstanding. Diluted EPS is calculated by adjusting the earnings and number of shares for the effects of all dilutive potential common shares.

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Significant accounting estimates and assumptions

12 Months Ended

Dec. 31, 2017

Disclosure of accounting judgements and estimates [Abstract]

Significant Accounting Estimates And Assumptions

3. SIGNIFICANT ACCOUNTING ESTIMATES AND ASSUMPTIONS

The significant accounting estimates and assumptions are continually evaluated and are based on historical experiences and various factors including expectations of future events that are considered to be reasonable. Actual results can differ from those estimates based on such definitions.

The significant judgments which management has made about the application of the Group’s accounting policies and key sources of uncertainty in estimate do not differ from those used in preparing the consolidated financial statements for the year ended December 31, 2016.

(1) Income taxes

The Group is subject to income taxes in numerous jurisdictions, which requires significant judgment in determining realization of deferred tax. Actual tax payment may be different from the provision estimate and such difference may affect the income tax expense. There are various transactions and calculations for which the ultimate tax determination is uncertain. Deferred tax assets relating to tax losses carried forward and deductible temporary differences are recognized, only to the extent that it is probable that future taxable profit will be available against which the tax losses carried forward and the deductible temporary differences can be utilized. This assessment requires significant management estimates and judgments. Future taxable profit is estimated based on, among other relevant factors, forecasted operating results, which are based on historical financial performance. In the event the Group was to determine that it would be able to realize its deferred income tax assets in the future at an amount different than their net recorded amount, the Group would make an adjustment to the provision for income taxes at such time.

(2) Valuation of financial instruments

Financial instruments classified as held-for trading or designated as at FVTPL and financial instruments classified as AFS are recognized in the financial statements at fair value. All derivatives are measured at fair value. Financial instruments, which are not traded in active market will have less objective fair value and require broad judgment in liquidity, concentration, uncertainty in market factors and assumption in price determination and other risks. The fair value of those assets is established by using valuation techniques.

As described in the significant accounting policies in Note 2-(9)-5), ‘ Fair value of financial assets and liabilities’, a range of valuation techniques, which include market approach and income approach and internally developed models that incorporate various types of assumptions and variables, are used to determine the fair value of financial instruments.

(3) Impairment of loan and receivables

Impairment loss for loan and receivables carried at amortized cost is measured as the difference between such assets’ carrying value and the present value of estimated recoverable cash flows (excluding any future loss events that have not occurred) discounted by using the initial effective interest rate. In the event that the estimated cash flow of the financial asset is affected by one or more loss events occurred after initial recognition, it is determined that the financial asset is impaired.

The objective evidences that a financial asset is impaired incorporate below loss events:

1) Financial assets that are individually significant

• Delinquent loans

• Debt in restructuring

• Probable state of debtor’s bankruptcy or liquidation

• Occurrence of significant reduction in the value of securities

• Breach of limit or debt covenant

• Deterioration of operating performance

2) Financial assets that are not individually significant

• Repayment status of debtor or observable macro-economic indexes

The Group first assesses whether objective evidence of impairment exists individually for financial assets that are individually significant (individual evaluation of impairment), and individually or collectively for financial assets that are not individually significant. If the Group determines that no objective evidence of impairment exists for an individually assessed financial asset, it includes the asset in a group of financial assets with similar credit risk characteristics and collectively assesses them for impairment (collective evaluation of impairment).

There are two components to the Group’s loan impairment provisions (individual and collective).

Individual assessment of impairment losses are calculated by discounting the expected future cash flows of a loan at its original effective interest rate and comparing the resultant present value with the loan’s carrying amount. This process normally encompasses management’s best estimate, such as operating cash flow of debtor and net realizable value of any collateral held and the timing of anticipated receipts.

Collective assessment of impairment losses are established on a portfolio basis using the methodology based on historical loss experience. The methodology based on historical loss experience is used to estimate inherent incurred loss on groups of assets for collective evaluation of impairment. Such methodology incorporates factors such as type of product and debtors, credit rating, portfolio size, loss emergence period and recovery period and applies probability of default on each assets (or pool of assets) and loss given default by type of collateral. Also, consistent assumptions are applied to form a formula-based model in estimating inherent loss and to determine factors on the basis of historical loss experience and current condition. The methodology and assumptions used for estimating future cash flows are reviewed regularly to reduce any differences between loss estimates and actual loss experience.

(4) Defined benefit plan

The Group operates defined benefit retirement pension plans. Defined benefit retirement pension plans are measured through actuarial valuation and the Group estimates discount rate, future wage growth rate, mortality rates to produce actuarial valuation. Defined benefit retirement pension plans contain significant uncertainty in these estimates due to their long-term characteristic.

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Risk Management

12 Months Ended

Dec. 31, 2017

Disclosure of risk management [Abstract]

Disclosure of risk management [Text block]

4. RISK MANAGEMENT

The Group’s operating activity is exposed to various financial risks. The Group is required to analyse and assess the level of complex risks, and determine the permissible level of risks and manage such risks. The Group’s risk management procedures have been established to improve the quality of assets for holding or investment purposes by making decisions as how to avoid or mitigate risks through the identification of the source of the potential risks and their impact.

The Group has established an approach to manage the acceptable level of risks and reduce the excessive risks in financial instruments in order to maximize the profit given risks present, for which the Group has implemented processes for risk identification, assessment, control, and monitoring and reporting.

The risk is managed by the risk management department in accordance with the Group’s risk management policy. The Risk Management Committee makes decisions on the risk strategies such as the avoidance of concentration on capital at risk and the establishment of acceptable level of risk.

(1) Credit risk

Credit risk represents the possibility of financial losses incurred when the counterparty fails to fulfill its contractual obligations. The goals of credit risk management are to maintain the Group’s credit risk exposure to a permissible degree and to optimize its rate of return considering such credit risk.

1) Credit risk management

The Group considers the probability of failure in performing the obligation of its counterparties, credit exposure to the counterparty, the related default risk and the rate of default loss. The Group uses the credit rating model to assess the possibility of counterparty’s default risk; and when assessing the obligor’s credit grade, the Group utilizes credit grades derived using statistical methods.

In order to manage credit risk limit, the Group establishes the appropriate credit line per obligor, company or industry. It monitors obligor’s credit line, total exposures and loan portfolios when approving the loan.

The Group mitigates credit risk resulting from the obligor’s credit condition by using financial and physical collateral, guarantees, netting agreements and credit derivatives. The Group has adopted the entrapment method to mitigate its credit risk. Credit risk mitigation is reflected in qualifying financial collateral, trade receivables, guarantees, residential and commercial real estate and other collaterals. The Group regularly performs a revaluation of collateral reflecting such credit risk mitigation.

2) Maximum exposure to credit risk

The Group’s maximum exposure to credit risk refers to net book value of financial assets net of allowances, which shows the uncertainties of maximum changes of net value of financial assets attributable to a particular risk without considering collateral and other credit enhancements obtained. However, the maximum exposure is the fair value amount (recorded on the books) for derivatives, maximum contractual obligation for payment guarantees and loan commitment for loan contracts.

The maximum exposure to credit risk is as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Loans and receivables:
Korean treasury and government agencies		16,058,305		8,823,584
Banks		20,242,260		26,845,309
Corporates		88,985,566		90,570,551
Consumers		133,106,502		140,866,760
Sub-total		258,392,633		267,106,204
Financial assets at fair value through profit or loss (“FVTPL”):
Deposits indexed to gold prices		26,180		25,972
Debt securities held for trading		2,644,916		2,644,333
Designated at FVTPL		4,348		9,694
Derivative assets for trading		2,898,295		3,115,775
Sub-total		5,573,739		5,795,774
Available-for-sale (“AFS”) debt securities		16,541,888		13,229,244
Held-to-maturity (“HTM”) securities		13,910,251		16,749,296
Derivative assets for hedging		140,577		59,272
Off-balance sheet items:
Guarantees		14,761,784		12,859,715
Loan commitments		83,795,496		80,760,325
Sub-total		98,557,280		93,620,040
Total		393,116,368		396,559,830

a) Credit risk exposure by geographical areas

The following tables analyze credit risk exposure by geographical areas (Unit: Korean Won in millions):

	December 31, 2016
	Korea		China		USA		UK		Japan		Others(*)		Total
Loans and receivables		241,380,250		4,286,018		2,792,088		895,874		323,470		8,714,933		258,392,633
Financial assets at FVTPL		5,205,849		6,525		—		261,547		81		99,737		5,573,739
AFS debt securities		16,155,290		13,845		137,861		—		—		234,892		16,541,888
HTM securities		13,758,863		—		20,336		—		—		131,052		13,910,251
Derivative assets for hedging		74,166		—		—		66,342		—		69		140,577
Off-balance sheet items		96,245,092		737,513		103,130		80,831		23,250		1,367,464		98,557,280
Total		372,819,510		5,043,901		3,053,415		1,304,594		346,801		10,548,147		393,116,368

	December 31, 2017
	Korea		China		USA		UK		Japan		Others(*)		Total
Loans and receivables		250,678,479		4,104,912		2,823,247		1,094,988		381,890		8,022,688		267,106,204
Financial assets at FVTPL		5,551,870		2,937		—		148,955		—		92,012		5,795,774
AFS debt securities		12,407,602		52,259		151,131		—		—		618,252		13,229,244
HTM securities		16,606,692		—		63,732		—		—		78,872		16,749,296
Derivative assets for hedging		16,590		—		—		42,682		—		—		59,272
Off-balance sheet items		91,603,852		529,193		172,570		66,974		25,039		1,222,412		93,620,040
Total		376,865,085		4,689,301		3,210,680		1,353,599		406,929		10,034,236		396,559,830

(*) Others consist of financial assets in Indonesia, Vietnam, Panama and the European countries and others.

b) Credit risk exposure by industries

The following tables analyze credit risk exposure by industries, which are service, manufacturing, finance and insurance, construction, individuals and others in accordance with the Korea Standard Industrial Classification Code (Unit: Korean Won in millions):

	December 31, 2016
	Service		Manufacturing		Finance and insurance		Construction		Individuals		Others		Total
Loans and receivables		46,040,278		35,652,974		37,711,983		3,789,670		125,558,637		9,639,091		258,392,633
Financial assets at FVTPL		77,198		360,881		4,093,567		24,140		993		1,016,960		5,573,739
AFS debt securities		1,092,279		57,781		9,568,151		63,166		—		5,760,511		16,541,888
HTM securities		1,673,971		—		8,290,451		251,599		—		3,694,230		13,910,251
Derivative assets for hedging		—		—		140,577		—		—		—		140,577
Off-balance sheet items		18,423,611		26,878,320		9,927,574		4,621,971		33,603,651		5,102,153		98,557,280
Total		67,307,337		62,949,956		69,732,303		8,750,546		159,163,281		25,212,945		393,116,368

	December 31, 2017
	Service		Manufacturing		Finance and insurance		Construction		Individuals		Others		Total
Loans and receivables		47,192,641		34,502,509		38,260,051		3,574,746		133,094,287		10,481,970		267,106,204
Financial assets at FVTPL		100,766		83,239		4,640,068		15,073		1,040		955,588		5,795,774
AFS debt securities		707,737		37,719		7,331,774		153,534		—		4,998,480		13,229,244
HTM securities		1,348,754		—		10,962,149		296,214		—		4,142,179		16,749,296
Derivative assets for hedging		—		—		59,272		—		—		—		59,272
Off-balance sheet items		16,892,926		21,427,378		9,841,379		3,842,479		36,928,554		4,687,324		93,620,040
Total		66,242,824		56,050,845		71,094,693		7,882,046		170,023,881		25,265,541		396,559,830

3) Credit risk of loans and receivables

The credit exposure of loans and receivables by customer and loan classification are as follows (Unit: Korean Won in millions):

	December 31, 2016
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Loans and receivables neither overdue nor impaired		16,062,399		20,258,860		49,815,352		31,520,617		7,142,440		88,478,409		132,195,005		256,994,673
Loans and receivables overdue but not impaired		—		—		48,294		57,245		—		105,539		765,829		871,368
Impaired loans and receivables		—		—		1,404,568		429,955		208,372		2,042,895		510,793		2,553,688
Gross loans and receivables		16,062,399		20,258,860		51,268,214		32,007,817		7,350,812		90,626,843		133,471,627		260,419,729
Allowance for credit losses		4,094		16,600		1,156,000		424,142		61,135		1,641,277		365,125		2,027,096
Total, net		16,058,305		20,242,260		50,112,214		31,583,675		7,289,677		88,985,566		133,106,502		258,392,633

	December 31, 2017
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Loans and receivables neither overdue nor impaired		8,825,767		26,861,286		50,463,112		34,107,547		5,547,950		90,118,609		139,886,407		265,692,069
Loans and receivables overdue but not impaired		8		—		65,616		63,067		—		128,683		878,406		1,007,097
Impaired loans and receivables		—		—		1,402,131		251,431		46,717		1,700,279		537,001		2,237,280
Gross loans and receivables		8,825,775		26,861,286		51,930,859		34,422,045		5,594,667		91,947,571		141,301,814		268,936,446
Allowance for credit losses		2,191		15,977		1,078,733		267,162		31,125		1,377,020		435,054		1,830,242
Total, net		8,823,584		26,845,309		50,852,126		34,154,883		5,563,542		90,570,551		140,866,760		267,106,204

a) Credit quality of loans and receivables

The Group manages credit quality of its loans and receivables, (neither overdue nor impaired, net of allowance) through an internal rating system. Segregation of credit quality is as follows (Unit: Korean Won in millions):

	December 31, 2016
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Upper grade(*1)		16,058,288		20,242,260		41,461,420		18,755,963		5,337,033		65,554,416		128,374,017		230,228,981
Lower grade(*2)		17		—		7,941,871		12,550,282		1,763,658		22,255,811		3,680,920		25,936,748
Total		16,058,305		20,242,260		49,403,291		31,306,245		7,100,691		87,810,227		132,054,937		256,165,729
Value of collateral(*3)		—		358,456		18,003,674		25,493,006		3,996,162		47,492,842		111,054,910		158,906,208
	December 31, 2017
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Upper grade(*1)		8,823,576		26,845,309		43,613,460		23,191,627		4,623,750		71,428,837		135,893,496		242,991,218
Lower grade(*2)		—		—		6,565,274		10,767,062		898,536		18,230,872		3,835,030		22,065,902
Total		8,823,576		26,845,309		50,178,734		33,958,689		5,522,286		89,659,709		139,728,526		265,057,120
Value of collateral(*3)		1,409		483,469		19,868,185		29,600,362		2,642,674		52,111,221		114,441,637		167,037,736

(*1) AAA~BBB for Corporates, and 1~6 level for Consumers

(*2) BBB- ~C for Corporates, and 7~10 level for Consumers

(*3) The value of collateral held is the recoverable amount when calculating the allowance for credit losses.

The total amount in the above table are net of allowances for credit losses, for loans and receivables neither overdue nor impaired, amounting to 828,944 million Won and 634,949 million Won as of December 31, 2016 and 2017, respectively.

b) Aging analysis of loans and receivables

Aging analysis of loans and receivables (overdue but not impaired, net of allowance) is as follows (Unit: Korean Won in millions):

	December 31, 2016
Past due	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Less than 30 days		—		—		45,255		41,329		—		86,584		584,995		671,579
30 to 59 days		—		—		1,553		8,933		—		10,486		90,296		100,782
60 to 89 days		—		—		337		2,123		—		2,460		49,151		51,611
Total		—		—		47,145		52,385		—		99,530		724,442		823,972
Value of collateral(*)		—		—		7,021		45,304		—		52,325		546,164		598,489

	December 31, 2017
Past due	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Less than 30 days		8		—		59,560		48,002		—		107,562		683,445		791,015
30 to 59 days		—		—		3,702		6,550		—		10,252		94,376		104,628
60 to 89 days		—		—		928		4,935		—		5,863		55,011		60,874
Total		8		—		64,190		59,487		—		123,677		832,832		956,517
Value of collateral(*)		—		—		4,619		46,513		—		51,132		619,867		670,999

(*) The value of collateral held is the recoverable amount used when calculating allowance for credit losses.

The total amounts in the above table are net of allowances for credit losses, for loans and receivables that are overdue but not impaired, amounting to 47,396 million Won and 50,580 million Won as of December 31, 2016 and 2017, respectively.

c) Impaired loans and receivables

Impaired loans and receivables, net of allowance are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Impaired loans		—		—		661,778		225,045		188,986		1,075,809		327,123		1,402,932
Value of collateral(*)		—		—		482,680		236,954		42,166		761,800		250,583		1,012,383

	December 31, 2017
	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Impaired loans		—		—		609,202		136,707		41,256		787,165		305,402		1,092,567
Value of collateral(*)		—		—		562,638		141,026		20,351		724,015		227,966		951,981

(*) The value of collateral held is the recoverable amount used when calculating allowance for credit losses.

The total amounts in the above table are net of allowances for credit losses, for impaired loans and receivables amounting to 1,150,756 million Won and 1,144,713 million Won as of December 31, 2016 and 2017, respectively.

4) Credit risk of debt securities

The Group manages debt securities based on the credit rating. Credit soundness of debt securities on the basis of External Credit Assessment Institution (“ECAI”), Korea’s qualified external rating agency, is as follows (Unit: Korean Won in millions):

	December 31, 2016
	Financial assets at FVTPL(*)		AFS debt securities		HTM securities		Total
AAA		1,658,332		12,490,934		13,342,384		27,491,650
AA- ~ AA+		720,535		3,372,310		466,401		4,559,246
BBB- ~ A+		266,049		618,736		101,466		986,251
Below BBB-		4,348		59,908		—		64,256
Total		2,649,264		16,541,888		13,910,251		33,101,403

	December 31, 2017
	Financial assets at FVTPL(*)		AFS debt securities		HTM securities		Total
AAA		1,685,099		9,897,689		15,806,327		27,389,115
AA- ~ AA+		722,923		2,386,567		888,547		3,998,037
BBB- ~ A+		236,311		876,482		52,188		1,164,981
Below BBB-		9,694		68,506		2,234		80,434
Total		2,654,027		13,229,244		16,749,296		32,632,567

(*) Financial assets at FVTPL comprise debt securities held for trading and financial assets designated at FVTPL.

(2) Market risk

Market risk is the possible risk of loss arising from trading activities and non-trading activities in the volatility of market factors such as interest rates, stock prices and foreign exchange rates.

Market risk occurs as a result of changes in the interest rates and foreign exchange rates for financial instruments that are not yet settled, and all contracts are exposed to a certain level of volatility according to changes in the interest rates, credit spreads, foreign exchange rates and the price of equity securities.

1) Market risk management

For trading activities and non-trading activities, the Group avoids, bears, or mitigates risks by identifying the underlying source of the risks, measuring parameters and evaluating their appropriateness.

At the beginning of each year, the Risk Management Committee establishes a Value at Risk (“VaR”, maximum losses) limit, loss limit and risk capital limit by subsidiaries for its management purposes. The limit by investment desk/dealer is independently managed to the extent of the limit given to subsidiaries and the limit by investment and loss cut is managed by the risk management personnel with department.

The Group uses both a standard-based and an internal model-based approach to measure market risk. The standard-based approach is used to calculate individual market risk of required capital while the internal model-based approach is used to calculate general capital market risk and it is used to measure internal risk management measure. For the trading activities, the Risk Management department measures the VaR limit by department, risk factor and loss limit on a daily basis and reports regularly to the Risk Management Committee.

2) Sensitivity analysis of market risk

The Group performs the sensitivity analyses both for trading and for non-trading activities.

For the trading activities, the Group uses a VaR model that uses certain assumptions of possible fluctuations in market conditions and, by conducting simulations of gains and losses, under which the model estimates the maximum losses that may occur. A VaR model predicts based on statistics of possible losses on the portfolio at a certain period currently or in the future. It indicates the maximum expected loss with at least 99% credibility. In short, there exists a one percent possibility that the actual loss might exceed the predicted loss generated from the VaR calculation. The actual results are periodically monitored to examine the validity of the assumptions and variables and factors that are used in VaR calculations. However, this approach cannot prevent the loss when the market fluctuation exceeds expectation.

For the non-trading activities, interest rate Earning at Risk (“EaR”) and interest rate VaR, which is based on the simulations of the Net Interest Income (“NII”) and Net Present Value (“NPV”), are calculated for the Bank, and the risks for all other subsidiaries are measured and managed by the interest rate EaR and the interest rate VaR calculations based on the Bank for International Settlements (“BIS”) Framework.

NII is a profit based indicator for displaying profit changes in the short term due to short term interest changes. It will be estimated as subtracting interest expenses of liabilities from the interest income of assets. NPV is an indicator for displaying risks in economic view according to unfavorable changes related to interest rate. It will be estimated as subtracting the present value of liabilities from the present value of assets.

EaR shows the maximum profit-loss amount, which indicates the maximum deduction amount caused by the unfavorable changes related to the interest rate of a certain period (i.e. 1 year). Interest rate VaR shows the potential maximum loss generated by the unfavorable changes during a certain period of time in the present or future.

a) Trading activities

The minimum, maximum and average VaR for the year ended December 31, 2016 and 2017, respectively, and the VaR as of December 31, 2016 and 2017, respectively, are as follows (Unit: Korean Won in millions):

	As of December 31, 2016			For the year ended December 31, 2016									As of December 31, 2017			For the year ended December 31, 2017
Risk factor				Average			Maximum			Minimum						Average			Maximum			Minimum
Interest rate		3,250			2,844			6,430			1,367			4,183			3,799			4,918			2,467
Stock price		4,191			3,456			5,063			2,304			909			2,863			4,419			909
Foreign currencies		4,396			4,914			7,686			3,967			4,750			5,051			6,636			4,061
Commodity price		152			113			325			21			—			31			188			—
Diversification		(5,630	)		(5,355	)		(10,385	)		(4,034	)		(4,472	)		(4,621	)		(6,798	)		(2,067	)
Total VaR(*)		6,359			5,972			9,119			3,625			5,370			7,123			9,363			5,370

(*) VaR= Value at Risk

b) Non-trading activities

The NII and NPV are calculated for the assets and liabilities owned by the Bank, respectively, by using the simulation method. The scenario responding to interest rate (“IR”) changes are as follows (Unit: Korean Won in millions):

Name of scenario	December 31, 2016				December 31, 2017
	NII(*1)		NPV(*2)		NII(*1)		NPV(*2)
Base case		4,367,411		21,556,632		4,916,138		23,472,792
Base case (Prepay)		4,384,783		20,666,425		4,916,015		23,163,942
IR 100bp up		4,802,118		20,893,490		5,361,546		22,886,122
IR 100bp down		3,903,129		22,279,204		4,386,437		24,127,559
IR 200bp up		5,236,879		20,289,742		5,806,723		22,372,208
IR 200bp down		2,975,351		23,052,848		3,452,590		24,830,482
IR 300bp up		5,671,639		19,742,627		6,251,897		21,929,189
IR 300bp down		1,968,273		25,096,193		2,254,609		26,633,807

(*1) Net Interest Income

(*2) Net Portfolio Value

The interest EaR and VaR are calculated based on the BIS Framework of other subsidiaries excluding the Bank are as follows (Unit: Korean Won in millions):

December 31, 2016		December 31, 2017
EaR	VaR	EaR	VaR
188,381	110,335	255,679	130,821

The Group estimates and manages risks related to changes in interest rate due to the difference in the maturities of interest-bearing assets and the liabilities and discrepancies in the terms of interest rate. Cash flows of principal amounts and interests from interest bearing assets and liabilities by re-pricing date are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Within 3 months		4 to 6 months		7 to 9 months		10 to12 months		1 to 5 years		Over 5 years		Total
Asset:
Loans and receivables		148,237,350		42,032,667		8,064,502		7,757,087		55,838,192		35,245,734		297,175,532
AFS financial assets		3,165,094		2,946,992		2,854,514		2,915,226		5,029,918		713,596		17,625,340
HTM financial assets		2,770,079		1,515,213		1,246,503		1,143,170		6,853,951		892,030		14,420,946
Total		154,172,523		46,494,872		12,165,519		11,815,483		67,722,061		36,851,360		329,221,818
Liability:
Deposits due to customers		100,051,821		36,614,529		25,028,378		25,017,836		34,513,004		40,737		221,266,305
Borrowings		13,772,710		1,044,748		491,330		368,431		2,816,565		421,677		18,915,461
Debentures		2,109,235		2,077,681		860,455		1,545,943		14,613,799		4,143,773		25,350,886
Total		115,933,766		39,736,958		26,380,163		26,932,210		51,943,368		4,606,187		265,532,652

	December 31, 2017
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Asset:
Loans and receivables		161,653,892		41,671,530		7,614,159		6,411,841		54,150,998		26,272,958		297,775,378
AFS financial assets		2,150,708		2,500,103		2,016,711		2,367,762		4,229,000		601,735		13,866,019
HTM financial assets		2,286,179		2,161,467		1,433,425		1,687,362		9,369,794		345,868		17,284,095
Total		166,090,779		46,333,100		11,064,295		10,466,965		67,749,792		27,220,561		328,925,492
Liability:
Deposits due to customers		106,815,564		37,750,367		25,117,556		27,585,458		37,518,878		91,246		234,879,069
Borrowings		9,865,249		1,056,579		412,966		437,431		2,709,010		479,827		14,961,062
Debentures		1,955,902		2,452,240		1,018,563		1,752,847		19,770,538		2,869,766		29,819,856
Total		118,636,715		41,259,186		26,549,085		29,775,736		59,998,426		3,440,839		279,659,987

3) Currency risk

Currency risk arises from monetary financial instruments denominated in foreign currencies other than the functional currency. Therefore, no currency risk arises from non-monetary items or financial instruments denominated in the functional currency.

Financial instruments in foreign currencies exposed to currency risk are as follows (Unit: USD in millions, JPY in millions, CNY in millions, EUR in millions, and Korean Won in millions):

	December 31, 2016
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Asset:
Loans and receivables		22,868		27,635,970		108,944		1,129,539		23,194		4,018,678		1,548		1,962,856		4,382,990		39,130,033
Financial assets at FVTPL		66		79,386		57		589		—		—		30		37,562		34,124		151,661
AFS financial assets		898		1,085,108		—		—		80		13,844		—		570		144,799		1,244,321
HTM financial assets		17		20,517		—		—		—		—		—		—		143,535		164,052
Total		23,849		28,820,981		109,001		1,130,128		23,274		4,032,522		1,578		2,000,988		4,705,448		40,690,067
	December 31, 2016
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Liability:
Financial liabilities at FVTPL		75		90,908		253		2,621		—		—		88		111,098		115,980		320,607
Deposits due to customers		11,294		13,648,729		124,790		1,293,835		18,950		3,283,291		651		825,165		2,402,076		21,453,096
Borrowings		7,193		8,692,792		3,243		33,625		—		—		222		280,894		115,332		9,122,643
Debentures		2,931		3,541,769		—		—		700		121,282		—		—		228,720		3,891,771
Other financial liabilities		2,235		2,700,703		12,390		128,464		1,508		261,278		245		310,396		846,990		4,247,831
Total		23,728		28,674,901		140,676		1,458,545		21,158		3,665,851		1,206		1,527,553		3,709,098		39,035,948
Off-balance accounts		8,593		10,384,163		28,675		297,304		1,061		183,883		374		473,845		312,187		11,651,382
	December 31, 2017
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Asset:
Loans and receivables		23,000		24,642,900		126,944		1,204,843		25,224		4,127,936		1,156		1,479,351		3,937,733		35,392,763
Financial assets at FVTPL		32		34,303		25		238		—		—		27		34,583		104,892		174,016
AFS financial assets		1,966		2,105,972		—		—		319		52,259		—		590		302,801		2,461,622
HTM financial assets		111		118,868		—		—		—		—		—		—		78,175		197,043
Total		25,109		26,902,043		126,969		1,205,081		25,543		4,180,195		1,183		1,514,524		4,423,601		38,225,444
	December 31, 2017
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Liability:
Financial liabilities at FVTPL		41		43,423		79		752		—		—		19		24,878		69,977		139,030
Deposits due to customers		13,744		14,725,686		195,176		1,852,440		21,865		3,578,142		883		1,129,802		2,396,826		23,682,896
Borrowings		6,604		7,080,118		2,218		21,056		—		—		247		315,685		242,874		7,659,733
Debentures		3,467		3,714,411		—		—		700		114,555		—		—		375,749		4,204,715
Other financial liabilities		2,392		2,562,740		16,125		153,043		1,802		294,950		129		165,189		588,625		3,764,547
Total		26,248		28,126,378		213,598		2,027,291		24,367		3,987,647		1,278		1,635,554		3,674,051		39,450,921
Off-balance accounts		8,108		8,687,009		33,624		319,127		1,199		196,261		406		519,843		176,886		9,899,126

(3) Liquidity risk

Liquidity risk refers to the risk that the Group may encounter difficulties in meeting obligations from its financial liabilities.

1) Liquidity risk management

Liquidity risk management is to prevent potential cash shortages as a result of mismatching the use of funds (assets) and sources of funds (liabilities) or unexpected cash outflows. The financial liabilities that are relevant to liquidity risk are incorporated within the scope of risk management. Derivatives instruments are excluded from those financial liabilities as they reflect expected cash flows for a pre-determined period.

Assets and liabilities are grouped by account under Asset Liability Management (“ALM”) in accordance with the characteristics of the account. The Group manages liquidity risk by identifying the maturity gap, and then gap ratio through performing various cash flows analysis (i.e. based on remaining maturity and contract period, etc.), while maintaining the gap ratio at or below the target limit.

2) Maturity analysis of non-derivative financial liabilities

a) Cash flows of principals and interests by remaining contractual maturities of non-derivative financial liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		678,813		1,529		94		47		154,325		—		834,808
Deposits due to customers		136,835,315		28,685,473		19,254,108		30,875,962		6,284,092		2,732,019		224,666,969
Borrowings		9,146,895		2,355,336		876,836		1,486,710		4,711,273		420,720		18,997,770
Debentures		2,108,780		2,077,387		860,596		1,518,524		14,641,016		4,116,768		25,323,071
Other financial liabilities		14,813,948		27,544		5,480		1,433		84,792		2,751,825		17,685,022
Total		163,583,751		33,147,269		20,997,114		33,882,676		25,875,498		10,021,332		287,507,640
	December 31, 2017
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		168,442		155,984		1,717		512		375		—		327,030
Deposits due to customers		148,008,777		29,563,310		18,175,348		32,468,110		7,409,118		2,624,594		238,249,257
Borrowings		6,115,732		1,893,173		1,489,272		1,178,107		3,924,681		479,568		15,080,533
Debentures		1,955,255		2,452,565		1,018,714		1,744,731		19,770,380		2,869,699		29,811,344
Other financial liabilities		7,121,342		162,871		825		1,003		128,940		2,730,001		10,144,982
Total		163,369,548		34,227,903		20,685,876		35,392,463		31,233,494		8,703,862		293,613,146

b) Cash flows of principals and interests of non-derivative financial liabilities by estimated redemption or withdrawal are as follows; (Unit: Korean Won in millions):

	December 31, 2016
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		678,813		1,529		94		47		154,325		—		834,808
Deposits due to customers		148,089,355		30,163,971		17,600,803		20,947,335		5,128,387		2,331,993		224,261,844
Borrowings		9,146,901		2,355,332		876,835		1,486,710		4,711,273		420,719		18,997,770
Debentures		2,108,780		2,077,387		860,596		1,518,524		14,641,016		4,116,768		25,323,071
Other financial liabilities		14,813,948		27,544		5,480		1,433		84,792		2,751,825		17,685,022
Total		174,837,797		34,625,763		19,343,808		23,954,049		24,719,793		9,621,305		287,102,515

	December 31, 2017
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		168,442		155,984		1,717		512		375		—		327,030
Deposits due to customers		159,146,602		31,298,562		16,667,130		21,995,294		6,487,047		2,278,756		237,873,391
Borrowings		6,115,732		1,893,173		1,489,272		1,178,107		3,924,681		479,568		15,080,533
Debentures		1,955,255		2,452,565		1,018,714		1,744,731		19,770,380		2,869,699		29,811,344
Other financial liabilities		7,121,342		162,871		825		1,003		128,940		2,730,001		10,144,982
Total		174,507,373		35,963,155		19,177,658		24,919,647		30,311,423		8,358,024		293,237,280

3) Maturity analysis of derivative financial liabilities is as follows (Unit: Korean Won in millions):

Derivatives held for trading purpose are not managed in accordance with their contractual maturity, but the Group holds such financial instruments with the purpose of disposing or redemption before their maturity. As such, those derivatives are incorporated as “Within 3 months” in the table below.

The cash flow by the maturity of derivative financial liabilities as of December 31, 2016 and 2017 is as follows:

	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
December 31, 2016		3,009,977		—		—		208		7,013		—		3,017,198
December 31, 2017		3,150,149		—		—		381		67,373		—		3,217,903

4) Maturity analysis of off-balance accounts

The Group provides guarantees on behalf of customers. A financial guarantee represents an irrevocable undertaking that the Group will meet a customer’s obligations to third parties if the customer fails to do so. Under a loan commitment, the Group agrees to make funds available to a customer in the future. Loan commitments which are usually for a specified term may be unconditionally cancellable or may persist, provided all conditions in the loan facility are satisfied or waived. Commitments to lend include commercial standby facilities and credit lines, liquidity facilities to commercial paper conduits and utilized overdraft facilities. The maximum limit to be paid by the Group in accordance with guarantees and loan commitment only applies to principal amounts. There are contractual maturities for financial guarantees, such as guarantees for debentures issued or loans, loan commitments, and other guarantees, however, under the terms of the guarantees and loan commitments, funds should be paid upon demand from the counterparty. Details of off-balance accounts are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Guarantees		14,761,784		12,859,715
Loan commitments		83,795,496		80,760,325

(4) Operational risk

The Group defines the operational risk that could cause a negative effect on capital resulting from inadequate internal process, labor work and systematic problem or external factors.

1) Operational risk management

The Group has been running the operational risk management system under Basel II. The Group developed advanced measurement approached to quantify required capital for operational risk. This system is used for reinforcement in foreign competitions, reducing the amount of risk capitals, managing the risk, and precaution for any unexpected occasions. This system has been tested by the independent third party, and this system approved by the Financial Supervisory Service.

2) Operational risk measurement

To quantify required capital for operational risk, the Group applies Advanced Measurement Approaches (AMA) using internal and external loss data, Business Environment and Internal Control Factors (BEICFs), and scenario analysis (SBA). For the operational risk management for its subsidiaries, the Group adopted the Basic Indicator Approach.

(5) Capital management

The Group complies with the standard of capital adequacy provided by financial regulatory authorities. The capital adequacy ratio is based on Basel III of Basel Committee on Banking Supervision and Basel III was applied from the end of December, 2013. The capital adequacy ratio is calculated by dividing required capital by asset (weighted with a risk premium – risk weighted assets) based on the consolidated financial statements of the Group.

According to this regulation, the Group is required to meet the following new minimum requirements: 6.25% and 5.38% Common Equity Tier 1 capital ratio, 7.75% and 6.88% Tier 1 capital ratio and 9.75% and 8.88% total capital ratio as of December 31, 2017 and 2016, respectively. The details are as follows (Unit: Korean won in millions):

	December 31, 2016
Tier 1 capital		15,714,480
Other Tier 1 capital		3,275,496
Tier 2 capital		3,910,513
Total risk-adjusted capital		22,900,489
Risk-weighted assets for credit risk		138,018,500
Risk-weighted assets for market risk		2,277,809
Risk-weighted assets for operational risk		9,431,814
Total risk-weighted assets		149,728,123
Common Equity Tier 1 ratio		10.50	%
Tier 1 capital ratio		12.68	%
Total capital ratio		15.29	%

	December 31, 2017
Tier 1 capital		16,074,987
Other Tier 1 capital		3,041,664
Tier 2 capital		3,486,555
Total risk-adjusted capital		22,603,206
Risk-weighted assets for credit risk		134,767,711
Risk-weighted assets for market risk		2,316,938
Risk-weighted assets for operational risk		9,677,559
Total risk-weighted assets		146,762,208
Common Equity Tier 1 ratio		10.95	%
Tier 1 capital ratio		13.03	%
Total capital ratio		15.40	%

XML

Operating Segments

12 Months Ended

Dec. 31, 2017

Disclosure of operating segments [Abstract]

Operating Segments

5. OPERATING SEGMENTS

In evaluating the operational performance of the Group and allocating resources accordingly, the Group’s Chief Operation Decision Maker (the “CODM”) utilizes the information per types of customers. This financial information of the segments is regularly reviewed by the CODM to make decisions about resources to be allocated to each segment and evaluate its performance.

(1) Segment by types of customers

The Group’s reporting segments comprise the following customers: consumer banking, corporate banking, investment banking, capital market, credit card and headquarters and others. The reportable segments are classified based on the target customers for whom the service is being provided.

• Consumer banking: Loans/deposits and financial services for consumers, etc.

• Corporate banking: Loans/deposits and export/import, financial services for corporations, etc.

• Investment banking: Domestic/foreign investment, structured finance, M&A, Equity & fund investment related business, venture advisory related tasks, real estate SOC development practices etc.

• Capital market: Fund management, investment securities and derivatives business, etc.

• Credit Card: Credit card, cash service and card loan, etc. and

• Headquarter and others: Segments that do not belong to above operating segments

The details of operating income by each segment are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Consumer banking			Corporate banking			Investment banking			Capital market			Credit Card			Head- quarter and Others			Sub-total			Inter- segment transaction			Total
Net Interest income		1,289,088			1,699,913			5,601			40,913			378,019			743,092			4,156,626			605,274			4,761,900
Interest income		2,850,985			3,255,796			154,460			19,394			500,449			1,585,636			8,366,720			331,515			8,698,235
Interest expense		(1,227,921	)		(1,880,195	)		(18	)		(81	)		(122,430	)		(979,449	)		(4,210,094	)		273,759			(3,936,335	)
Inter-segment		(333,976	)		324,312			(148,841	)		21,600			—			136,905			—			—			—
Net non-interest income		554,957			513,686			115,111			18,015			98,034			279,437			1,579,240			(947,937	)		631,303
Non-interest income		886,057			503,321			489,659			5,760,567			871,486			3,245,543			11,756,633			(366,953	)		11,389,680
Non-interest expense		(353,032	)		(25,993	)		(374,548	)		(5,742,552	)		(773,452	)		(2,907,816	)		(10,177,393	)		(580,984	)		(10,758,377	)
Inter-segment		21,932			36,358			—			—			—			(58,290	)		—			—			—
Other expense		(1,790,292	)		(1,795,561	)		53,089			(44,187	)		(321,265	)		(470,592	)		(4,368,808	)		327,191			(4,041,617	)
Administrative expense		(1,782,234	)		(925,566	)		(14,933	)		(16,945	)		(124,362	)		(553,539	)		(3,417,579	)		267,192			(3,150,387	)
Impairment losses on credit loss and others		(8,058	)		(869,995	)		68,022			(27,242	)		(196,903	)		82,947			(951,229	)		59,999			(891,230	)
Operating income		53,753			418,038			173,801			14,741			154,788			551,937			1,367,058			(15,472	)		1,351,586
Non-operating income (expense)		(19,113	)		(2,189	)		43,728			197			(5,150	)		136,954			154,427			(54,067	)		100,360
Net income before income tax expense		34,640			415,849			217,529			14,938			149,638			688,891			1,521,485			(69,539	)		1,451,946
Income tax expense		(8,383	)		(98,886	)		(52,642	)		(3,615	)		(32,780	)		(136,891	)		(333,197	)		(43,357	)		(376,554	)
Net income		26,257			316,963			164,887			11,323			116,858			552,000			1,188,288			(112,896	)		1,075,392

	For the year ended December 31, 2016
	Consumer banking			Corporate banking			Investment banking			Capital market			Credit Card			Head- quarter and Others			Sub-total			Inter- segment transaction			Total
Net Interest income		1,484,233			1,741,140			14,613			48,826			428,095			713,678			4,430,585			588,959			5,019,544
Interest income		2,979,811			3,026,148			153,160			19,575			556,681			1,492,148			8,227,523			284,789			8,512,312
Interest expense		(1,023,290	)		(1,780,990	)		(225	)		(324	)		(128,586	)		(863,523	)		(3,796,938	)		304,170			(3,492,768	)
Inter-segment		(472,288	)		495,982			(138,322	)		29,575			—			85,053			—			—			—
Net non-interest income		557,410			550,194			160,885			4,033			79,713			302,800			1,655,035			(955,695	)		699,340
Non-interest income		923,810			535,514			605,026			7,590,087			986,147			4,563,280			15,203,864			(433,879	)		14,769,985
Non-interest expense		(405,912	)		(32,873	)		(444,141	)		(7,586,054	)		(906,434	)		(4,173,415	)		(13,548,829	)		(521,816	)		(14,070,645	)
Inter-segment		39,512			47,553			—			—			—			(87,065	)		—			—			—
Other expense		(1,875,579	)		(1,476,190	)		(110,863	)		(51,995	)		(364,137	)		(574,606	)		(4,453,370	)		308,692			(4,144,678	)
Administrative expense		(1,788,672	)		(966,878	)		(14,983	)		(17,964	)		(148,001	)		(793,978	)		(3,730,476	)		252,000			(3,478,476	)
Impairment losses on credit loss and others		(86,907	)		(509,312	)		(95,880	)		(34,031	)		(216,136	)		219,372			(722,894	)		56,692			(666,202	)
Operating income		166,064			815,144			64,635			864			143,671			441,872			1,632,250			(58,044	)		1,574,206
Non-operating income (expense)		(35,081	)		(1,619	)		46,559			(5,288	)		(1,504	)		55,291			58,358			(79,175	)		(20,817	)
Net income before income tax expense		130,983			813,525			111,194			(4,424	)		142,167			497,163			1,690,608			(137,219	)		1,553,389
Income tax expense		(31,698	)		(203,983	)		(26,909	)		1,071			(32,774	)		16,475			(277,818	)		1,962			(275,856	)
Net income		99,285			609,542			84,285			(3,353	)		109,393			513,638			1,412,790			(135,257	)		1,277,533

	For the year ended December 31, 2017
	Consumer banking			Corporate banking			Investment banking			Capital market			Credit Cards			Head- quarters and others			Sub-total			Inter- segment transaction			Total
Net Interest income		1,702,939			1,795,377			12,124			36,883			463,603			622,790			4,633,716			586,934			5,220,650
Interest income		3,149,625			2,964,813			148,500			18,834			599,550			1,360,734			8,242,056			308,631			8,550,687
Interest expense		(955,836	)		(1,681,652	)		(243	)		—			(135,947	)		(834,662	)		(3,608,340	)		278,303			(3,330,037	)
Inter-segment		(490,850	)		512,216			(136,133	)		18,049			—			96,718			—			—			—
Net non-interest income		649,950			571,336			152,168			69,671			73,537			389,004			1,905,666			(745,990	)		1,159,676
Non-interest income		802,387			680,778			366,523			9,548,399			1,163,575			2,683,407			15,245,069			(395,833	)		14,849,236
Non-interest expense		(253,961	)		(170,268	)		(214,355	)		(9,478,728	)		(1,090,038	)		(2,132,053	)		(13,339,403	)		(350,157	)		(13,689,560	)
Inter-segment		101,524			60,826			—			—			—			(162,350	)		—			—			—
Other income(expense)		(1,906,561	)		(1,149,288	)		(63,835	)		14,662			(398,652	)		(939,406	)		(4,443,080	)		219,496			(4,223,584	)
Administrative expense		(1,808,974	)		(832,429	)		(12,881	)		(16,567	)		(163,536	)		(954,238	)		(3,788,625	)		257,824			(3,530,801	)
Impairment losses due to credit loss and others		(97,587	)		(316,859	)		(50,954	)		31,229			(235,116	)		14,832			(654,455	)		(38,328	)		(692,783	)
Operating income		446,328			1,217,425			100,457			121,216			138,488			72,388			2,096,302			60,440			2,156,742
Non-operating income (expense)		(98,510	)		(3,153	)		39,350			—			(5,219	)		(112,734	)		(180,266	)		(26,970	)		(207,236	)
Net income before income tax expense		347,818			1,214,272			139,807			121,216			133,269			(40,346	)		1,916,036			33,470			1,949,506
Income tax expense		(84,172	)		(296,634	)		(33,834	)		(29,335	)		(32,055	)		63,396			(412,634	)		(6,784	)		(419,418	)
Net income		263,646			917,638			105,973			91,881			101,214			23,050			1,503,402			26,686			1,530,088

(2) Information on products and services

The products of the Group are classified as interest-bearing products such as loans, deposits and debt securities and non-interest bearing products such as loan commitment, credit commitment, equity securities, and credit card service. This classification of products has been reflected in the segment information presenting interest income and non-interest income.

(3) Information on geographical areas

Among the Group’s revenue (interest income and non-interest income) from services, revenue from the domestic customers for the years ended December 31, 2015, 2016 and 2017 amounted to 18,974,359 million Won, 22,265,508 million Won and 22,279,666 million Won, respectively, and revenue from the foreign customers amounted to 1,113,556 million Won, 1,016,788 million Won and 1,120,257 million Won, respectively. Among the Group’s non-current assets (investments in joint ventures and associates, investment properties, premises and equipment and intangible assets), non-current assets attributed to domestic subsidiaries as of December 31, 2016 and 2017 are 3,498,327 million Won and 3,550,764 million Won, respectively, and foreign subsidiaries are 240,946 million Won and 233,732 million Won, respectively.

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Cash and cash equivalents

12 Months Ended

Dec. 31, 2017

Cash and cash equivalents [Abstract]

Cash And Cash Equivalents

6. CASH AND CASH EQUIVALENTS

(1) Details of cash and cash equivalents are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Cash		2,113,739		2,009,363
Foreign currencies		742,340		617,155
Demand deposits		4,238,956		3,423,355
Fixed deposits		496,289		858,413
Total		7,591,324		6,908,286

(2) Significant transactions not involving cash inflows and outflows are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2016			2017
Changes in other comprehensive income (loss) due to valuation of AFS financial assets		12,586			(84,498	)
Changes in other comprehensive income (loss) of investment in associates		(7,937	)		612
Changes in other comprehensive income of foreign operations translation		28,712			(208,329	)
Changes in other comprehensive income related to valuation of cash flow hedging		10,371			777
Changes in other comprehensive income due to remeasurement of the net defined benefit liability		34,162			10,497
Changes in investments in associates due to equity swap and others		—			51,227
Changes in investments in associates due to accounts transfer		(156,708	)		(62,571	)
Changes in unpaid dividends of hybrid equity securities		5,187			(10,658	)

(3) Adjustments of liabilities from financing activities in current year are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2017
	January 1, 2017		Issuances		Redemption			Not involving cash inflows and outflows								December 31, 2017
								Foreign Exchange			Variation of gains on valuation of hedged items			Others
Borrowings		18,769,515		9,057,999		(12,692,882	)		(350,429	)		—			503		14,784,706
Debentures		23,565,449		18,438,221		(13,620,520	)		(478,249	)		(39,373	)		4,123		27,869,651
Total		42,334,964		27,496,220		(26,313,402	)		(828,678	)		(39,373	)		4,626		42,654,357

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Financial Assets at Fair Value through Profit or Loss

12 Months Ended

Dec. 31, 2017

Financial assets at fair value through profit or loss [Abstract]

Disclosure of financial assets at fair value through profit or loss [Text block]

7. FINANCIAL ASSETS AT FAIR VALUE THRUGH PROFIT OR LOSS

(1) Financial assets at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Financial assets held for trading		5,633,724		5,820,787
Financial assets designated at FVTPL		17,000		22,290
Total		5,650,724		5,843,077

(2) Financial assets held for trading are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Deposits:
Deposits indexed to gold prices		26,180		25,972
Securities:
Debt securities
Korean treasury and government agencies		519,337		540,438
Financial institutions		1,444,459		1,476,498
Corporates		681,120		627,397
Equity securities		35,983		21,666
Beneficiary certificates		23,891		13,041
Loaned securities		4,459		—
Sub-total		2,709,249		2,679,040
Derivatives instruments assets		2,898,295		3,115,775
Total		5,633,724		5,820,787

(3) Financial assets designated at FVTPL as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Debt securities		4,348		9,694
Equity securities		12,652		12,596
Total		17,000		22,290

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Available for sale financial assets

12 Months Ended

Dec. 31, 2017

Available-for-sale Financial Assets [Abstract]

Available For Sale Financial Assets

8. AVAILABLE-FOR-SALE FINANCIAL ASSETS

Details of AFS financial assets are as follows (Unit: Korean Won in millions):

	As of December 31, 2016
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Debt securities:
Korean treasury and government agencies		3,778,688		13,700		(3,758	)		3,788,630
Financial institutions		6,310,517		7,585		(3,904	)		6,314,198
Corporates		4,336,195		93,957		(20,966	)		4,409,186
Asset-backed securities		250,630		—		(1,427	)		249,203
Bond denominated in foreign currencies		1,226,893		1,076		(16,105	)		1,211,864
Other debt securities		73,360		1,871		(3	)		75,228
Sub-total		15,976,283		118,189		(46,163	)		16,048,309
Equity securities		1,034,299		420,038		(724	)		1,453,613
Beneficiary certificates		2,802,847		40,405		(21,170	)		2,822,082
Securities loaned		493,625		3,040		(3,086	)		493,579
Total		20,307,054		581,672		(71,143	)		20,817,583

	As of December 31, 2017
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Debt securities:
Korean treasury and government agencies		2,338,760		1,193		(9,386	)		2,330,567
Financial institutions		5,225,921		1,504		(10,159	)		5,217,266
Corporates		2,727,016		3,851		(5,635	)		2,725,232
Asset-backed securities		309,518		—		(1,337	)		308,181
Bond denominated in foreign currencies		2,449,954		3,100		(10,475	)		2,442,579
Other debt securities		35,154		21		(12	)		35,163
Sub-total		13,086,323		9,669		(37,004	)		13,058,988
Equity securities		982,393		430,921		(2,236	)		1,411,078
Beneficiary certificates		697,655		18,701		(3,728	)		712,628
Securities loaned		169,988		664		(396	)		170,256
Total		14,936,359		459,955		(43,364	)		15,352,950

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Held to maturity financial assets

12 Months Ended

Dec. 31, 2017

Disclosure of held-to-maturity financial assets [Abstract]

Held-To-Maturity Financial Assets

9. HELD-TO-MATURITY FINANCIAL ASSETS

Details of HTM financial assets are as follows (Unit: Korean Won in millions):

	As of December 31, 2016
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Korean treasury and government agencies		3,754,356		26,366		(6,391	)		3,774,331
Financial institutions		5,168,487		9,236		(4,940	)		5,172,783
Corporates		4,823,356		58,176		(7,093	)		4,874,439
Bond denominated in foreign currencies		164,052		—		(428	)		163,624
Total		13,910,251		93,778		(18,852	)		13,985,177

	As of December 31, 2017
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Korean treasury and government agencies		3,994,857		6,944		(15,266	)		3,986,535
Financial institutions		7,245,426		2,923		(15,067	)		7,233,282
Corporates		5,311,970		12,367		(25,326	)		5,299,011
Bond denominated in foreign currencies		197,043		832		(1,024	)		196,851
Total		16,749,296		23,066		(56,683	)		16,715,679

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Loans and receivables

12 Months Ended

Dec. 31, 2017

Disclosure Of Loans And Receivables [Abstract]

Loans And Receivables

10. LOANS AND RECEIVABLES

(1) Details of loans and receivables are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Due from banks		14,815,476		8,868,378
Loans		235,400,585		251,523,301
Other receivables		8,176,572		6,714,525
Total		258,392,633		267,106,204

(2) Details of due from banks are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Due from banks in local currency:
Due from the Bank of Korea		11,395,162			6,246,496
Due from the depository banks		3			30,003
Due from non-monetary financial institutions		9,811			150
Due from the Korea Exchange		1,625			50,000
Others		73,283			97,365
Allowance for credit losses		(2,798	)		(1,541	)
Sub-total		11,477,086			6,422,473
Due from banks in foreign currencies:
Due from banks on demand		877,636			794,353
Due from banks on time		1,684,631			972,915
Others		778,418			679,554
Allowance for credit losses		(2,295	)		(917	)
Sub-total		3,338,390			2,445,905
Total		14,815,476			8,868,378

(3) Details of restricted due from banks are as follows (Unit: Korean Won in millions):

Financial institution	Counterparty	December 31, 2016		Reason of restriction
Due from banks in local currency:
Due from the Bank of Korea	The Bank of Korea		11,395,162	Reserve deposits under BOK Act
Others	Samsung Investment & Securities Co., Ltd. and others		70,304	Reserve deposits of the futures, option and others
			11,465,466
Due from banks in foreign currencies:
Due from banks on demand	The Bank of Korea and others		854,612	Reserve deposits under BOK Act and others
Others	The People’s Bank of China and others		778,418	Reserve deposits and others
			1,633,030
			13,098,496

Financial institution	Counterparty	December 31, 2017		Reason of restriction
Due from banks in local currency:
Due from the Bank of Korea	The Bank of Korea		6,246,496	Reserve deposits under BOK Act
Others	the Korea Exchange and others		94,394	Central counter party KRW margin and others
			6,340,890
Due from banks in foreign currencies:
Due from banks on demand	The Bank of Korea and others		787,520	Reserve deposits under The BOK Act and others
Others	The People’s Bank of China and others		367,108	Reserve deposits and others
			1,154,628
			7,495,518

(4) Details of loans are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Loans in local currency		191,309,481			200,213,230
Loans in foreign currencies		14,101,839			13,147,888
Domestic banker’s letter of credit		3,754,030			2,516,907
Credit card accounts		6,673,765			6,827,295
Bills bought in foreign currencies		7,758,575			8,197,159
Bills bought in local currency		414,451			334,714
Factoring receivables		96,763			137,523
Advances for customers on guarantees		25,197			23,620
Privately placed bonds		328,405			362,319
Securitized loans		252,690			563,152
Call loans		2,985,077			3,003,455
Bonds purchased under resale agreements		8,854,753			16,859,064
Loan origination costs and fees		458,639			510,860
Others		251,635			607,325
Present value discount		(13,827	)		(10,988	)
Allowance for credit losses		(1,850,888	)		(1,770,222	)
Total		235,400,585			251,523,301

(5) Details of other receivables are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
CMA accounts		190,000			135,000
Receivables		5,417,676			4,459,318
Accrued income		1,080,489			1,026,273
Telex and telephone subscription rights and refundable deposits		1,019,577			984,620
Other debtors		639,945			166,877
Allowance for credit losses		(171,115	)		(57,563	)
Total		8,176,572			6,714,525

(6) Changes in allowance for probable credit losses on loans and receivables are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Consumers			Corporates			Credit card			Others			Total
Beginning balance		(326,435	)		(2,128,090	)		(129,117	)		(370,264	)		(2,953,906	)
Net provision		(103,166	)		(744,416	)		(180,563	)		(83,994	)		(1,112,139	)
Recoveries of written-off loans		(29,219	)		(198,089	)		(34,207	)		—			(261,515	)
Charge-off		240,541			1,139,102			198,077			592			1,578,312
Sales of loans and receivables		2,518			138,055			—			866			141,439
Unwinding effect		12,514			99,854			—			—			112,368
Others		(186	)		7,390			—			10,180			17,384
Ending balance		(203,433	)		(1,686,194	)		(145,810	)		(442,620	)		(2,478,057	)

	For the year ended December 31, 2016
	Consumers			Corporates			Credit card			Others			Total
Beginning balance		(203,433	)		(1,686,194	)		(145,810	)		(442,620	)		(2,478,057	)
Net provision		(73,356	)		(536,359	)		(207,730	)		(73,318	)		(890,763	)
Recoveries of written-off loans		(53,679	)		(192,183	)		(44,393	)		(19,233	)		(309,488	)
Charge-off		155,424			722,359			242,561			236,857			1,357,201
Sales of loans and receivables		2,055			113,177			—			91,800			207,032
Unwinding effect		10,319			66,901			—			—			77,220
Others		(1,188	)		13,457			—			(2,510	)		9,759
Ending balance		(163,858	)		(1,498,842	)		(155,372	)		(209,024	)		(2,027,096	)

	For the year ended December 31, 2017
	Consumers			Corporates			Credit card			Others			Total
Beginning balance		(163,858	)		(1,498,842	)		(155,372	)		(209,024	)		(2,027,096	)
Net provision		(131,275	)		(539,222	)		(203,968	)		12,192			(862,273	)
Recoveries of written-off loans		(45,060	)		(84,413	)		(51,366	)		(68	)		(180,907	)
Charge-off		142,099			453,249			228,640			63,181			887,169
Sales of loans and receivables		898			65,145			—			29,186			95,229
Unwinding effect		8,643			36,548			—			—			45,191
Others		908			211,729			1			(193	)		212,445
Ending balance		(187,645	)		(1,355,806	)		(182,065	)		(104,726	)		(1,830,242	)

XML

Fair value of financial assets and liabilities

12 Months Ended

Dec. 31, 2017

Disclosure Of Fair Value Measurement [Abstract]

The Fair Value Of Financial Assets And Liabilities

11. THE FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES

The fair value hierarchy is determined by the levels of judgment involved in estimating fair values of financial assets and liabilities. The specific financial instruments characteristics and respective market condition such as volume of transactions and transparency of transactions between market participants are considered when determining the classification of the inputs used in the valuations. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities. The Group maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value of its financial assets and financial liabilities. Fair value is measured based on the perspective of a market participant. As such, even when market information is not readily available, the Group’s own assumptions reflect those the Group believes a market participants would use for measuring those specific assets or liabilities at the measurement date.

The fair value measurement is described in the one of the following three levels used to classify fair value measurements:

• Level 1—fair value measurements are those derived from quoted prices (unadjusted) in active markets for identical assets or liabilities. The types of financial assets or liabilities generally included in Level 1 are publicly traded equity and debt securities and derivatives.

• Level 2—fair value measurements are those derived from inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly (i.e. prices) or indirectly (i.e. derived from prices). The types of financial assets or liabilities generally included in Level 2 are debt securities not traded in active markets and derivatives traded in OTC of which valuation techniques do not require significant judgment.

• Level 3—fair value measurements are those derived from valuation techniques that include significant inputs for the asset or liability that are not based on observable market data (unobservable inputs). The types of financial assets or liabilities generally included in Level 3 are non-publicly traded securities and derivatives and debt securities of which valuation techniques require significant judgments and subjectivity.

The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Group’s assessment of the significance of a particular input to a fair value measurement in its entirety requires judgment and consideration of factors specific to the asset or liability.

(2) Fair value hierarchy of financial assets and liabilities measured at fair value are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Level 1(*1)		Level 2(*1)		Level 3(*2)		Total
Financial assets:
Financial assets held for trading
Deposits		26,180		—		—		26,180
Debt securities		370,636		2,274,280		—		2,644,916
Equity securities		35,983		—		—		35,983
Beneficiary certificates		—		23,891		—		23,891
Loaned securities		4,459		—		—		4,459
Derivative instrument assets		3,233		2,871,909		23,153		2,898,295
Sub-total		440,491		5,170,080		23,153		5,633,724
Financial assets designed at FVTPL
Debt securities		—		—		4,348		4,348
Equity securities		—		—		12,652		12,652
Sub-total		—		—		17,000		17,000
AFS financial assets
Debt securities		2,288,917		13,759,392		—		16,048,309
Equity securities		428,678		—		1,024,935		1,453,613
Beneficiary certificates		—		2,291,571		530,511		2,822,082
Loaned securities		391,279		102,300		—		493,579
Sub-total		3,108,874		16,153,263		1,555,446		20,817,583
Derivative assets		—		140,478		99		140,577
Total		3,549,365		21,463,821		1,595,698		26,608,884
Financial liabilities:
Financial liabilities held for trading
Deposits		26,501		—		—		26,501
Derivative liabilities		1,750		2,974,703		33,524		3,009,977
Sub-total		28,251		2,974,703		33,524		3,036,478
Financial liabilities designated at FVTPL
Equity-linked securities		—		197		673,709		673,906
Debentures		—		92,974		—		92,974
Sub-total		—		93,171		673,709		766,880
Derivative liabilities		—		7,221		—		7,221
Total		28,251		3,075,095		707,233		3,810,579

	December 31, 2017
	Level 1(*1)		Level 2(*1)		Level 3(*2)		Total
Financial assets:
Financial assets held for trading
Deposits		25,972		—		—		25,972
Debt securities		405,942		2,238,391		—		2,644,333
Equity securities		21,666		—		—		21,666
Beneficiary certificates		—		13,041		—		13,041
Derivative assets		1,021		3,093,272		21,482		3,115,775
Sub-total		454,601		5,344,704		21,482		5,820,787
Financial assets designated at FVTPL
Debt securities		—		—		9,694		9,694
Equity securities		—		—		12,596		12,596
Sub-total		—		—		22,290		22,290
AFS financial assets
Debt securities		2,710,172		10,348,815		—		13,058,987
Equity securities		399,214		—		1,011,864		1,411,078
Beneficiary certificates		—		68,722		643,906		712,628
Securities loaned		69,778		100,478		—		170,256
Sub-total		3,179,164		10,518,015		1,655,770		15,352,949
Derivative assets		—		59,272		—		59,272
Total		3,633,765		15,921,991		1,699,542		21,255,298
Financial liabilities:
Financial liabilities held for trading
Deposits		25,964		—		—		25,964
Derivative liabilities		2,613		3,126,585		20,951		3,150,149
Securities sold		—		—		—		—
Sub-total		28,577		3,126,585		20,951		3,176,113
Financial liabilities designated at FVTPL
Equity-linked securities		—		—		160,057		160,057
Debentures		—		91,739		—		91,739
Sub-total		—		91,739		160,057		251,796
Derivative liabilities		—		67,754		—		67,754
Total		28,577		3,286,078		181,008		3,495,663

(*1) There was no transfers between level 1 and level 2 of financial assets and liabilities measured at fair value. The Group recognizes transfers between levels at the end of reporting period in which events have occurred or conditions have changed.

(*2) Certain AFS financial assets were measured at cost as of December 31, 2016 and 2017, that are amounting to 43,202 million Won and 37,092 million Won, respectively. These unquoted equity instruments mostly represent minority investments in special purpose entity vehicles such as asset securitization structures. They are measured at cost because (a) observable inputs of financial information to measure fair value was not available to obtain, or (b) there is a significant variance in likely estimated cash flows or (c) the probabilities for the various estimated cash flows could not be measured reliably. In addition, there were no indicators of impairments in these investments and the Group has no intention to dispose these investments in the foreseeable future.

During the year, the Group disposed of certain financial assets which were carried at cost because they did not have quoted market prices in an active market and could not be reliably measured at fair value. The carrying amount and gain from disposal of these financial assets amounted to 1,266 million Won and 657 million Won for the year ended December 31, 2017, respectively.

Financial assets and liabilities designated at FVTPL, held-for-trading financial assets and liabilities, AFS financial assets, and derivative assets and liabilities are recognized at fair value. Fair value is the amount that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date.

Financial instruments are measured at fair value using a quoted market price in active markets. If there is no active market for a financial instrument, the Group determines the fair value using alternative assumptions and developing fair value measurement methods. Alternative assumptions and fair value measurement methods for each type of financial instruments are as follows:

	Fair value measurement methods	Input variables
Debt securities	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	Risk-free market rate, credit spread
Equity securities and Beneficiary certificates	Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.	Risk-free market rate, market risk premium, Beta, etc.
Derivatives	The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.	Risk-free market rate, forward rate, volatility, foreign exchange rate, stock prices, etc.
Equity-linked securities	The fair value of security linked to stock prices or derivatives is measured by the models such as DCF model, FDM, or Monte Carlo Simulation given the	Values of underlying assets, risk-free market rate, market rate, dividend and convenience yield, volatility, correlation
	natures of the securities or underlying assets.	coefficient, credit spread, and foreign exchange rate
Debentures	The fair value is measured by discounting the projected cash flows of a debenture by applying the market discount rate that is reflecting credit rating of the Group.	Risk-free market rate, forward rate

Valuation methods of financial assets and liabilities measured at fair value and classified into Level 3 and significant but unobservable inputs are as follows:

	Fair value measurement technique	Input variable	Range	Impact of changes in significant unobservable inputs on fair value measurement
Derivative assets	Option valuation model and others	Correlation coefficient	0.900~0.980	Variation of fair value increases as correlation coefficient increases.
		Volatility of underlying asset	12.1%~28.1%	Variation of fair value increases as volatility increases.
Derivative liabilities	Option valuation model and others	Correlation coefficient	0.900~0.980	Variation of fair value increases as correlation coefficient increases.
		Volatility of underlying asset	12.1%~28.1%	Variation of fair value increases as volatility increases.
Equity linked securities	Monte Carlo Simulation and others	Correlation coefficient	0.363~0.694	Equity linked securities’ variation of fair value increases if both volatility and correlation coefficient increase. However when correlation coefficient decreases, despite the increase in volatility, the variation of fair value of equity linked securities may decrease.
		Volatility of underlying asset	6.8%~58.9%
Equity securities and Beneficiary certificates	External appraisal value and others	Expected growth rate	0.0%~1.0%	Fair value increases as expected growth rate increases.
		Volatility of real estate sale price	0%	Fair value increases as sale price Increases
		Discount rate of lease cash flow and others	8.31%~8.54%	Fair value increases as discount rate of lease cash flow decreases

Fair value of financial assets and liabilities classified into level 3 is measured by the Group using its own valuation techniques or using external specialists. Unobservable inputs used in the fair value measurements are produced by the internal system of the Group and the appropriateness of inputs is reviewed regularly.

(3) Changes in financial assets and liabilities classified into level 3 are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	January 1, 2015		Net Income (loss)(*1)			Other comprehensive income (loss)			Purchases/ Issuances			Disposals/ Settlements			Transfer to or from level 3(*2)			December 31, 2015
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*5)		49,274		71,703			—			(8,166	)		(33,156	)		(979	)		78,676
Sub-total		49,274		71,703			—			(8,166	)		(33,156	)		(979	)		78,676
Financial assets designed at FVTPL
Equity-linked securities		6,066		—			—			—			(6,066	)		—			—
Debt securities		—		(14	)		—			1,000			—			—			986
Equity securities		10,567		1,042			—			—			—			—			11,609
Sub-total		16,633		1,028			—			1,000			(6,066	)		—			12,595
AFS financial assets
Equity securities(*3)		1,031,918		(57,373	)		105,290			105,930			(100,018	)		(92,379	)		993,368
Beneficiary certificates		355,694		3,905			(24,846	)		121,613			(79,296	)		—			377,070
Others		14,241		(7,064	)		1,370			—			(3,239	)		—			5,308
Sub-total		1,401,853		(60,532	)		81,814			227,543			(182,553	)		(92,379	)		1,375,746
Derivative assets		11,946		7,375			—			—			(13,348	)		—			5,973
Total		1,479,706		19,574			81,814			220,377			(235,123	)		(93,358	)		1,472,990
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*5)		41,711		58,565			—			4,008			(24,475	)		(1,202	)-		78,607
Financial liabilities designated at FVTPL
Equity-linked securities(*4)		361,993		(73,533	)		—			764,005			(304,917	)		(197	)		747,351
Total		403,704		(14,968	)		—			768,013			(329,392	)		(1,399	)		825,958

	For the year ended December 31, 2016
	January 1, 2016		Net Income (loss)(*1)			Other comprehensive income (loss)			Purchases/ Issuances		Disposals/ Settlements			Transfer to or from level 3(*2)			December 31, 2016
Financial assets:
Financial assets held for trading
Derivative instrument assets(*6)		78,676		(29,117	)		—			13,640		(39,506	)		(540	)		23,153
Financial assets designed at FVTPL
Debt securities		986		(161	)		—			4,509		(986	)		—			4,348
Equity securities		11,609		1,043			—			—		—			—			12,652
Sub-total		12,595		882			—			4,509		(986	)		—			17,000
AFS financial assets
Equity securities(*3)		993,368		(6,986	)		57,323			205,749		(205,348	)		(19,171	)		1,024,935
Beneficiary certificates		377,070		(868	)		5,794			174,024		(25,509	)		—			530,511
Others		5,308		594			(643	)		—		(5,259	)		—			—
Sub-total		1,375,746		(7,260	)		62,474			379,773		(236,116	)		(19,171	)		1,555,446
Derivative assets		5,973		3,877			—			—		(9,751	)		—			99
Total		1,472,990		(31,618	)		62,474			397,922		(286,359	)		(19,711	)		1,595,698
Financial liabilities:
Financial liabilities held for trading Derivative liabilities		78,607		(8,322	)		—			1,155		(37,916	)		—			33,524
Financial liabilities designated at FVTPL
Equity-linked securities		747,351		71,079			—			—		(144,721	)		—			673,709
Total		825,958		62,757			—			1,155		(182,637	)		—			707,233

	For the year ended December 31, 2017
	January 1, 2017		Net Income (loss)(*1)			Other comprehensive income			Purchases/ Issuances		Disposals/ Settlements			Transfer to or out of level 3(*2)		December 31, 2017
Financial assets:
Financial assets held for trading
Derivative assets		23,153		22,362			—			1,398		(25,431	)		—		21,482
Financial assets designated at FVTPL
Debt securities		4,348		346			—			5,000		—			—		9,694
Equity securities		12,652		(56	)		—			—		—			—		12,596
Sub-total		17,000		290			—			5,000		—			—		22,290
AFS financial assets
Equity securities		1,024,935		27,986			24,442			65,961		(131,460	)		—		1,011,864
Beneficiary certificates		530,511		212			(4,321	)		226,975		(109,471	)		—		643,906
Sub-total		1,555,446		28,198			20,121			292,936		(240,931	)		—		1,655,770
Derivative assets		99		329			—			—		(428	)		—		—
Total		1,595,698		51,179			20,121			299,334		(266,790	)		—		1,699,542
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities		33,524		24,866			—			500		(37,939	)		—		20,951
Financial liabilities designated at FVTPL
Equity-linked securities		673,709		112,015			—			—		(625,667	)		—		160,057
Total		707,233		136,881			—			500		(663,606	)		—		181,008

(*1) From financial assets and liabilities classified as Level 3 that the Group holds as at the end of the year, losses of 2,854 million Won, 94,238 million Won and 34,621 million Won for the year ended December 31 2015, 2016 and 2017, respectively, were recognized in net gain (loss) on financial instruments at FVTPL and net gain (loss) on AFS financial assets in the comprehensive income statements.

(*2) The Group recognizes transfers between levels at the end of reporting period within which events have occurred or conditions have changed.

(*3) AFS financial assets were transferred out of level 1 to level 3 upon the change of the fair value measurement method of the assets by using market the external valuation specialists from previously using quoted prices in the active market, in the opposite case, they were transferred out of level 3 to level 1.

(*4) Since the observable market data for equity-linked securities was available, such securities were transferred out of Level 3 into Level 2.

(*5) As the variables used for the valuation of interest rate and equity related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.

(*6) As the variables used for the valuation of currency related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.

4) Sensitivity analysis on the unobservable inputs used for measuring level 3 financial instruments.

The sensitivity analysis of the financial instruments has been performed by classifying with favorable and unfavorable changes based on how changes in unobservable assumptions would have effects on the fluctuations of financial instruments’ value. When the fair value of a financial instrument is affected by more than one unobservable assumption, the below table reflects the most favorable or the most unfavorable changes which resulted from varying the assumptions individually. The sensitivity analysis was performed for two types of level 3 financial instruments: (1) debt securities, equity securities, interest rate related derivatives, currency related derivatives, equity related derivatives, and equity-linked securities of which fair value changes are recognized as net income; (2) equity securities and beneficiary certificates of which fair value changes are recognized as other comprehensive income. Equity securities classified as level 3 but measured at costs are excluded from sensitivity analysis.

The following table shows the sensitivity analysis to disclose the effect of reasonably possible volatility on the fair value of a level 3 financial instruments for the years ended December 31, 2015, 2016 and 2017. (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Net income (loss)					Other comprehensive income (loss)
	Favorable		Unfavorable			Favorable		Unfavorable
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*1)(*2)		10,674		(9,729	)		—		—
Financial assets designed at FVTPL
Equity securities(*6)		793		(739	)		—		—
AFS Financial Assets
Equity securities(*3)(*4)		—		—			37,648		(20,869	)
Beneficiary certificates(*4)		—		—			4,102		(3,875	)
Others(*5)		—		—			80		(80	)
Total		11,467		(10,468	)		41,830		(24,824	)
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*1)(*2)		13,469		(12,281	)		—		—
Financial liabilities designated at FVTPL
Equity-linked securities(*1)		2,289		(2,247	)		—		—
Total		15,758		(14,528	)		—		—

	For the year ended December 31, 2016
	Net income (loss)					Other comprehensive income (loss)
	Favorable		Unfavorable			Favorable		Unfavorable
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*1)(*2)		861		(2,248	)		—		—
Financial assets designed at FVTPL
Debt securities(*6)		19		(18	)		—		—
Equity securities(*6)		688		(639	)		—		—
AFS Financial Assets
Equity securities(*3)(*4)		—		—			31,412		(18,551	)
Beneficiary certificates(*4)		—		—			2,903		(2,571	)
Total		1,568		(2,905	)		34,315		(21,122	)
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*1)(*2)		4,892		(3,568	)		—		—
Financial liabilities designated at FVTPL
Equity-linked securities(*1)		905		(857	)		—		—
Total		5,797		(4,425	)		—		—

	For the year ended December 31, 2017
	Net income (loss)					Other comprehensive income (loss)
	Favorable		Unfavorable			Favorable		Unfavorable
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*1)(*2)		1,234		(526	)		—		—
Financial assets designed at FVTPL
Debt securities(*6)		265		(309	)		—		—
Equity securities(*6)		670		(624	)		—		—
AFS Financial Assets
Equity securities(*3)(*4)		—		—			28,583		(15,246	)
Beneficiary certificates(*4)		—		—			1,861		(1,857	)
Total		2,169		(1,459	)		30,444		(17,103	)
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*1)(*2)		5		(513	)		—		—
Financial liabilities designated at FVTPL
Equity-linked securities(*1)		8		(7	)		—		—
Total		13		(520	)		—		—

(*1) Fair value changes of equity related derivatives assets and liabilities and equity-linked securities are calculated by increasing or decreasing historical volatility of the stock price and correlation, which are major unobservable variables, by 10%, respectively. In the case of interest rate related derivative assets and liabilities, fair value changes are calculated by increasing or decreasing the volatility of interest rate, which are major unobservable variables, by 10%, respectively.

(*2) Both derivative assets and liabilities for held for trading and hedging are included.

(*3) Fair value changes of equity securities are calculated by increasing or decreasing growth rate (0~1%) and discount rate or liquidation value (-1~1%) and discount rate. The growth rate, discount rate, and liquidation value are major unobservable variables.

(*4) Among the equity securities, whereas the sensitivity analysis of the capital contributions and beneficiary certificates is not possible in practice, fair value changes of such securities whose major unobservable variables are composed of the real estate are calculated by increasing or decreasing price fluctuation of real estate which is underlying assets and discount rate by 1%.

(*5) Fair value changes of other securities are calculated by increasing or decreasing price fluctuation of trust property or real estate which is underlying assets and discount rate by 1%. The prices of trust property and real estates and discount rate are major unobservable variables.

(*6) Fair value changes are measured by increasing or decreasing the discount rate by 10%, which is major unobservable variable, respectively.

(5) Fair value and carrying amount of financial assets and liabilities that are recorded at amortized cost are as follows (Unit: Korean Won in millions):

	As of December 31, 2016
	Fair value								Book value
	Level 1		Level 2		Level 3		Total
Financial assets:
Held-to-maturity financial assets		741,880		13,243,297		—		13,985,177		13,910,251
Loans and receivables		—		—		259,565,952		259,565,952		258,392,633
Financial liabilities:
Deposits due to customers		—		221,001,466		—		221,001,466		221,020,411
Borrowings		—		18,785,325		—		18,785,325		18,769,515
Debentures		—		24,004,668		—		24,004,668		23,565,449
Other financial liabilities		—		21,984,171		—		21,984,171		21,985,086

	As of December 31, 2017
	Fair value								Book value
	Level 1		Level 2		Level 3		Total
Financial assets:
Held-to-maturity financial assets		1,206,292		15,509,387		—		16,715,679		16,749,296
Loans and receivables		—		—		265,570,649		265,570,649		267,106,204
Financial liabilities:
Deposits due to customers		—		234,682,775		—		234,682,775		234,695,084
Borrowings		—		14,754,506		—		14,754,506		14,784,706
Debentures		—		27,889,781		—		27,889,781		27,869,651
Other financial liabilities		—		13,890,789		—		13,890,789		13,892,461

The fair values of financial instruments are measured using quoted market price in active markets. In case there is no active market for financial instruments, the Group determines the fair value using alternative assumptions through developing fair value measurement methods. Alternative assumptions and fair value measurement methods for financial assets and liabilities that are measured at amortized costs are given as follows:

	Fair value measurement technique	Input variables
Debt securities	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	Risk-free market rate and credit spread
Loans and receivables	The fair value is measured by discounting the projected cash flows of loan products by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the debtor.	Risk-free market rate, credit spread and prepayment-rate
Deposit due to customers, borrowings, debentures, and other financial liabilities	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting credit rating of the Group.	Risk-free market rate and forward rate

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Derecognition and offset of financial instruments

12 Months Ended

Dec. 31, 2017

Disclosure of derecognition and offsetting of financial assets and liabilities [Abstract]

Disclosure of derecognition and offsetting of financial assets and liabilities [Text block]

12. DERECOGNITION AND OFFSET OF FINANCIAL INSTRUMENTS

(1) Derecognition of financial assets

1) The book value, fair value of, and maximum exposure to loss from the financial assets that were derecognized from the consolidated financial statements of the Group through disposals, but the Group still have continuous involvements are given as below:

2016

As of December 31

For the year ended December 31

Classification

Carrying amount of Continuing involvement

Fair value amount of Continuing involvement

Maximum exposure to loss

Gain(loss) recognized in the year

Accumulated Gain(loss) recognized

Asset

Liability

Asset

Liability

Conditional disposal of loans to KAMCO(*)

Off-balance item

—

—

—

—

701

—

—

2017

As of December 31

For the year ended December 31

Classification

Carrying amount of Continuing involvement

Fair value amount of Continuing involvement

Maximum exposure to loss

Gain(loss) recognized in the year

Accumulated Gain(loss) recognized

Asset

Liability

Asset

Liability

Conditional disposal of loans to KAMCO(*)

Off-balance item

—

—

—

—

—

—

—

(*) KAMCO is still in the process of collecting cash flows related to the transferred assets and the maximum exposure to loss represents the carrying amounts of the assets at the date when they were transferred to KAMCO. Under previous Korea Generally Accepted Accounting Principles (K-GAAP), the Group derecognized the transferred assets although the Group retains and continues to retain substantially all such risks and rewards and according to the transition exemptions in IFRS 1 “First-time adoption of International Financial Reporting Standard”, the Group did not reassess the derecognition criteria for these transfers. As the process of collecting cash flows is completed, there is no financial instruments that qualify for derecognition but the Group still has continuous involvement as of December 31, 2017.

2) Transferred financial assets that are not derecognized in their entirety

a) Disposal of securities under repurchase agreement

The financial instruments that were disposed but the Group agreed to repurchase at the fixed amounts at the same time, so that they did not meet the conditions of derecognition, are as follows:

		December 31, 2016		December 31, 2017
Assets transferred	AFS financial assets		2,546,683		9,998
	HTM financial assets		7,133		5,436
	Total		2,553,816		15,434
Related liabilities	Bonds sold under repurchase agreements		2,004,905		3,173

b) Loaned securities

When the Group loans its securities to outside parties, the legal ownerships of the securities are transferred, however, they should be returned at the end of lending period therefore the Group does not derecognize them from the consolidated financial statements as it owns majority of risks and benefits from the securities continuously regardless of the transfer of legal ownership.

		December 31, 2016		December 31, 2017		Loaned to
Financial assets at FVTPL	Equity securities- listed stock		4,459		—	Samsung Securities Co., Ltd. and others
AFS financial assets	Korean treasury and government agencies bonds		493,579		170,256	Korea Securities Depository and others
	Total		498,038		170,256

The details of the transferred financial assets that are not derecognized in their entirety, such as disposal of securities under repurchase agreement or loaned securities, are explained in Note 18.

(2) The offset with financial assets and liabilities

The Group has both receivables and payables related to the Korean exchange markets that meet the offsetting criteria under IAS 32 and therefore the net amount of uncollected Korean exchange receivables (or unpaid Korean exchange payables) is included in loan and receivables (or other financial liabilities) on the consolidated statement of financial position.

The Group has the right to offset certain derivatives assets and liabilities (including corresponding cash collateral placed or received) as well as certain spot foreign exchange receivables in case of default, insolvency or bankruptcy by one of the counterparties. These agreements do not qualify for offsetting on the Group’s balance sheet under IAS 32.

The Group has entered into a sale under repurchase agreements and accounted it as collateralized borrowing. Also, the Group has entered into a purchase under resale agreement and accounted it as secured loans. The repurchase and resale agreement can have the offsetting right only under the trading party’s default, insolvency, or bankruptcy which do not satisfy the offsetting criteria of IAS 32, the Group recorded the collateralized borrowings in borrowings and the secured loans in loans and receivables. The Group under the repurchase agreements has offsetting right only upon the counter-party’s default, insolvency or bankruptcy, thus the repurchase agreements are applied by the TBMA/ISMA Global Master Repurchase Agreement of which do not satisfy the offsetting criteria of IAS 32. The Group disclosed bonds sold (purchased) under repurchase agreements as borrowings (loans and receivables).

As at the end of reporting periods, the financial instruments to be set off and may be covered by master netting agreements and similar agreements are given as below:

	December 31, 2016
	Gross amounts of recognized financial assets		Gross amounts of recognized financial liabilities set off		Net amounts of financial assets presented		Related amounts not set off in the statement of financial position				Net amounts
							Offsetting     agreement		Cash collateral     received
Financial assets:
Derivative assets and others(*1)		2,962,969		8,442		2,954,527		6,546,232		69,834		1,016,550
Receivable spot exchange(*2)		4,678,089		—		4,678,089
Bonds purchased under resale agreements(*2)		8,854,753		—		8,854,753		8,854,753		—		—
Domestic exchanges receivable(*2)(*5)		31,456,123		30,883,281		572,842		—		—		572,842
Total		47,951,934		30,891,723		17,060,211		15,400,985		69,834		1,589,392

	December 31, 2016
	Gross amounts of recognized financial liabilities		Gross amounts of recognized financial assets set off		Net amounts of financial liabilities presented		Related amounts not set off in the statement of financial position				Net amounts
							Offsetting     agreement		Cash collateral     pledged
Financial liabilities:
Derivative liabilities and others(*1)		3,467,374		8,442		3,458,932		6,695,062		105,270		1,341,375
Payable spot exchange(*3)		4,682,775		—		4,682,775
Bonds sold under repurchase agreements(*4)		2,004,905		—		2,004,905		2,004,905		—		—
Domestic exchanges payable(*3)(*5)		39,345,524		30,883,281		8,462,243		6,161,151		—		2,301,092
Total		49,500,578		30,891,723		18,608,855		14,861,118		105,270		3,642,467

	December 31, 2017
	Gross amounts of recognized financial assets		Gross amounts of recognized financial assets set off		Net amounts of financial assets presented		Related amounts not set off in the consolidated statement of financial position				Net amounts
							Netting agreements and others		Cash collateral     received
Financial assets:
Derivative assets and others(*1)		2,992,476		1,710		2,990,766		5,787,448		174,415		796,629
Receivable spot exchange(*2)		3,767,726		—		3,767,726
Bonds purchased under resale agreements(*2)		16,859,064		—		16,859,064		16,859,064		—		—
Domestic exchanges receivable(*2)(*5)		39,050,227		38,985,354		64,873		—		—		64,873
Total		62,669,493		38,987,064		23,682,429		22,646,512		174,415		861,502

	December 31, 2017
	Gross amounts of recognized financial liabilities		Gross amounts of recognized financial liabilities set off		Net amounts of financial liabilities presented		Related amounts not set off in the consolidated statement of financial position				Net amounts
							Netting agreements and others		Cash collateral pledged
Financial liabilities:
Derivative liabilities and others(*1)		3,160,217		1,710		3,158,507		5,866,682		157,750		857,961
Payable spot exchange(*3)		3,723,886		—		3,723,886
Bonds sold under repurchase agreements(*4)		3,173		—		3,173		3,173		—		—
Domestic exchanges payable(*3)(*5)		40,284,515		38,985,354		1,299,161		1,293,931		—		5,230
Total		47,171,791		38,987,064		8,184,727		7,163,786		157,750		863,191

(*1) Others include derivatives held for trading, derivatives for hedging and equity linked securities related to derivatives.

(*2) Items are included in loans and receivables.

(*3) Items are included in other financial liabilities.

(*4) Items are included in borrowings.

(*5) Certain financial assets and liabilities are presented as offset.

XML

Investment in Joint Ventures and Associates

12 Months Ended

Dec. 31, 2017

Equity Method Investments And Joint Ventures [Abstract]

Investment In Joint Ventures And Associates

13. INVESTMENTS IN JOINT VENTURES AND ASSOCIATES

(1) Investments in joint ventures and associates accounted for using the equity method of accounting are as follows (Unit: Korean Won in millions):

		Percentage of ownership (%)				Financial statement used as of
Investors and investees	Main business	December 31, 2016		December 31, 2017
Woori Bank and Woori Private Equity Asset Management Co., Ltd.:
Woori Blackstone Korea Opportunity No.1 Private Equity Fund(*19)	Other finance business		26.4		—	—
Woori Bank:
Kumho Tire Co., Inc.(*1)(*2)	Manufacturing		14.2		14.2	September 30(*3)
Woori Service Networks Co., Ltd.(*4)	Freight & staffing services		4.9		4.9	November 30(*3)
Korea Credit Bureau Co., Ltd.(*5)	Credit information		9.9		9.9	December 31
Korea Finance Security Co., Ltd.(*4)	Security service		15.0		15.0	November 30(*3)
Chin Hung International Inc.(*2)(*9)	Construction		28.4		25.3	November 30(*3)
Poonglim Industrial Co., Ltd.(*6)(*12)(*14)	Construction		31.0		29.4	September 30(*3)
STX Engine Co., Ltd.(*1)(*2)(*20)	Manufacturing		29.2		29.2	—
Samho International Co., Ltd.(*2)(*18)	Construction		7.8		—	—
Force TEC Co., Ltd.(*6)(*15)	Freight & staffing services		34.4		—	—
STX Corporation(*1)(*2)(*6)(*13)	Wholesale of non-specialized goods		9.5		19.7	September 30(*3)
Saman Corporation(*5)	General construction Technology service		9.2		9.2	September 30(*3)
Dongwoo C & C Co., Ltd.(*6)	Construction		23.2		23.2	—
SJCO Co., Ltd.(*6)	Aggregate transportation and wholesale		26.5		26.5	—
G2 Collection Co., Ltd.(*6)	Wholesale and retail sales		28.9		28.9	—
The Base Enterprise Co., Ltd.(*6)	Manufacturing		48.4		48.4	—
Heungjiwon Co., Ltd.(*6)(*17)	Other printing		27.8		—	—
Kyesan Engineering Co., Ltd.(*6)	Construction		23.2		23.2	—
Good Software Lap Co., Ltd.(*6)	Service		28.9		28.9	—
Wongwang Co., Ltd.(*6)	Wholesale and real estate		29.0		29.0	—
Sejin Construction Co., Ltd.(*6)	Construction		29.6		29.6	—
Deokwon Food Co., Ltd.(*6)(*17)	Poultry processing and storage		27.3		—	—
QTS Shipping Co., Ltd.(*6)	Complex transportation brokerage		49.4		49.4	—
DAEA SNC Co., Ltd.(*6)	Wholesale and retail sales		24.0		24.0	—
ARES-TECH Co., Ltd.(*6)	Electronic component manufacturing		23.4		23.4	—
Reading Doctors Co., Ltd.(*6)(*10)	Other service business		—		35.4	—
PREXCO Co., Ltd.(*6)(*10)	Manufacturing		—		28.1	—
Hyunwoo International Co., Ltd.(*6)(*10)	Manufacturing		—		25.9	—
Jiwon Plating Co., Ltd.(*6)(*16)	Plating		—		20.5	—
Cultizm Korea LTD Co., Ltd.(*6)(*16)	Wholesale and retail sales		—		31.3	—
Gil Co.,Ltd.(*6)(*16)	Manufacturing		—		26.1	—
NK Eng Co., Ltd.(*6)(*10)	Manufacturing		—		23.1	—
Woori Growth Partnerships New Technology Private Equity Fund	Other financial business		23.1		23.1	December 31
2016KIF-IMM Woori Bank Technology Venture Fund	Other financial business		20.0		20.0	December 31
K BANK Co., Ltd.(*5)	Finance		13.0		13.8	November 30(*3)
Smart Private Equity Fund No.2(*11)	Other financial business		—		20.0	December 31
Woori Bank-Company K Korea Movie Asset Fund(*11)	Other financial business		—		25.0	December 31
Well to Sea No. 3 Private Equity Fund(*11)	Finance		—		50.0	September 30(*3)
Woori Private Equity Fund:
Woori Renaissance Holdings(*7)	Other financial business		51.6		—	—
Woori Private Equity Asset Management Co., Ltd.,:
Woori Columbus 1st Private Equity Fund(*8)	Other financial business		2.0		—	—
Woori Investment Bank Co., Ltd.
Nomura-Rifa Private Real Estate Investment Trust No.17(*11)	Other financial business		—		25.0	December 31

(*1) The Group has significant influence on these entities through its position in the creditors’ council which is the decision making body regarding to financial and operational policies of associates.

(*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won).

(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.

(*4) Most of the significant business transactions of associates are with the Group as of December 31, 2016 and 2017.

(*5) The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.

(*6) The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.

(*7) The Group owns over 50% ownership as of December 31, 2016. However, the investment in this entity was accounted for using equity method as the ownership and related contracts meet the definition of joint arrangement under IFRS 11 Joint Arrangements. As of December 31, 2017 the entity has been excluded from the range of associates as liquidated.

(*8) As a general partner of Woori Columbus 1st Private Equity Fund, the Group had significant influence over the entity’s operational and financial policy making process, including participating in making decision of dividend or other distribution. As such, the investment in this entity was accounted for using equity method as of December 31, 2016. The Woori Columbus 1st Private Equity Fund has been removed from the list of associated companies as it was liquidated during the current period.

(*9) Due to consolidation of stocks and debt-equity swap, the Group’s number of holding shares and ownership ratio have decreased.

(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.

(*11) Due to capital contribution by the Group during the years ended December 31, 2017, the entities were included in the investment in associates.

(*12) The Group has sold a part of shares of the associates so the number of shares holding has decreased during the years ended December 31, 2017.

(*13) Due to debt-equity swap capital stock, the Group ownership ratio has increased during the years ended December 31, 2017.

(*14) As the carrying amounts of certain investments in associates had been reduced to zero, the Group discontinued the use of the equity method in accounting for those investments, and unrecognized losses due to the restricted application of equity method amount to 612 million Won and 16,344 million Won as of December 31, 2016 and 2017, respectively.

(*15) Not in scope for the associates, because the Group does not have significant influence over the entity due to the fact that it is going through workout process under receivership as of December 31, 2017.

(*16) Due to debt-equity swap, the entity was included in the investment in associates during the years ended December 31, 2017.

(*17) As the Group sold its entire ownership interest of the entities, it was exclude from the investment in associates during the years ended December 31, 2017.

(*18) The entity was sold after it was transferred to assets held for sale and was excluded from the investment in associates.

(*19) It has been removed from the list of associated companies as it was liquidated during the current period.

(*20) The shares of STX Engine Co., Ltd. owned by the Group were reclassified as assets held for sale, as the creditor financial institutions committee entered into a contract with UAMCO.,Ltd during the current period to sell STX Engine Co., Ltd. shares.

(2) Changes in the carrying value of investments in joint ventures and associates accounted for using the equity method of accounting are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Acquisition cost		January 1, 2015		Share of profits (losses)			Acquisi- tion(*3)		Disposal and others			Dividends			Change in Capital			Impairment			Other changes		December 31, 2015
Woori Blackstone Korea Opportunity Private Equity Fund No.1		81,608		100,436		9,266			—		(37,367	)		(16,291	)		—			—			—		56,044
Kumho Tire Co., Inc.		175,652		224,829		(11,979	)		—		—			—			1,201			—			—		214,051
Woori Service Networks Co., Ltd.		108		130		21			—		—			(12	)		—			—			—		139
Korea Credit Bureau Co., Ltd.		2,215		3,378		335			1,098		—			—			480			—			—		5,291
Korea Finance Security Co., Ltd.		3,337		4,272		(425	)		—		(81	)		(55	)		—			—			—		3,711
United PF 1st Corporate financial stability		191,617		203,418		3,350			—		(19,176	)		—			—			—			—		187,592
Chin Hung International Inc.		60,275		28,491		(14,489	)		29,451		—			—			482			—			—		43,935
Poonglim Industrial Co., Ltd.		13,917		—		10,643			—		—			—			(1	)		(22,472	)		17,143		5,313
STX Engine Co., Ltd.		47,008		2,293		(3,901	)		45,030		—			—			1,823			—			6,031		51,276
Samho Co., Ltd.		7,492		11,257		3,012			—		—			—			56			—			—		14,325
STX Corporation		42,215		14,347		(10,673	)		—		—			—			559			—			18		4,251
Osung LST Co., Ltd.		15,405		18,482		(4,322	)		—		—			—			4			(33,839	)		30,660		10,985
Saman Corporation		8,521		—		—			8,521		—			—			—			—			—		8,521
Phoenix Digital Tech Co., Ltd.		1,334		—		1,610			—		(1,610	)		—			—			—			—		—
Woori Renaissance Holdings		63,000		36,019		3,518			—		—			(2,416	)		—			—			—		37,121
Woori Columbus First PEF		1,200		1,084		222			—		—			—			—			—			—		1,306
Total		714,904		648,436		(13,812	)		84,100		(58,234	)		(18,774	)		4,604			(56,311	)		53,852		643,861

	For the year ended December 31, 2016
	Acquisition cost		January 1, 2016		Share of profits (losses)			Acquisi- tion(*1)		Disposal and others(*2)			Dividends			Change in Capital			Impairment			December 31, 2016
Woori Blackstone Korea Opportunity Private Equity Fund No.1		43,917		56,044		10,093			—		(37,036	)		(13,812	)		—			—			15,289
Kumho Tire Co., Inc.		175,652		214,050		(13,172	)		—		—			—			(546	)		—			200,332
Woori Service Networks Co., Ltd.		108		139		18			—		—			(12	)		—			—			145
Korea Credit Bureau Co., Ltd.		3,313		5,291		436			—		—			(135	)		—			—			5,592
Korea Finance Security Co., Ltd.		3,266		3,711		(281	)		—		—			(54	)		—			—			3,376
United PF 1st Corporate financial stability		172,441		187,592		3,265			—		(190,857	)		—			—			—			—
Chin Hung International Inc.		89,725		43,936		(996	)		—		—			—			92			—			43,032
Poonglim Industrial Co., Ltd.		13,916		5,313		(2,378	)		—		—			—			(2,935	)		—			—
STX Engine Co., Ltd.		92,038		51,276		(6,665	)		—		—			—			(1,575	)		—			43,036
Samho Co., Ltd.		7,492		14,325		5,392			—		—			—			12			—			19,729
STX Corporation		42,215		4,251		(4,222	)		—		—			—			(29	)		—			—
Osung LST Co., Ltd.		15,405		10,985		(2,903	)		—		(6,909	)		—			—			(1,173	)		—
Saman Corporation		8,521		8,521		252			—		—			—			(74	)		—			8,699
K-Growth crowd 2step Fund		800		—		(13	)		800		(787	)		—			—			—			—
Woori Growth Partnerships New Technology Private Equity Fund		13,602		—		(640	)		13,602		—			—			156			—			13,118
2016KIF-IMM Woori Bank Technology Venture Fund		1,800		—		—			1,800		—			—			—			—			1,800
K BANK Co.,Ltd.		32,500		—		(1,589	)		32,500		—			—			(469	)		—			30,442
Woori Renaissance Holdings		63,000		37,121		17,303			—		—			(2	)		—			—			54,422
Woori Columbus First PEF		1,200		1,306		(43	)		—		(1,065	)		(198	)		—			—			—
Total		780,911		643,861		3,857			48,702		(236,654	)		(14,213	)		(5,368	)		(1,173	)		439,012

	For the year ended December 31, 2017
	Acquisition cost		January 1, 2017		Share of profits (losses)			Acquisi- tion(*4)		Disposal and others(*5)			Dividends			Change in capital			Impairment			Others(*4)			December 31, 2017
Woori Blackstone Korea Opportunity No.1 Private Equity Fund		—		15,289		(4,617	)		—		(7,369	)		(3,303	)		—			—			—			—
Kumho Tire Co., Inc.		175,652		200,332		(102	)		—		—			—			1,545			(102,842	)		—			98,933
Woori Service Networks Co., Ltd.		108		145		21			—		—			(8	)		—			—			—			158
Korea Credit Bureau Co., Ltd.		3,313		5,592		371			—		—			(147	)		—			—			—			5,816
Korea Finance Security Co., Ltd.		3,266		3,376		197			—		—			(54	)		—			—			—			3,519
Chin Hung International Inc.		89,725		43,032		(14,375	)		41,053		—			—			1,535			—			(26,144	)		45,101
Poonglim Industrial Co., Ltd.		13,916		—		(6,733	)		—		—			—			—			—			6,733			—
STX Engine Co., Ltd.		92,038		43,036		(1,010	)		—		(46,217	)		—			4,191			—			—			—
Samho Co., Ltd.		7,492		19,729		2,021			—		(16,354	)		—			(73	)		(5,323	)		—			—
STX Corporation		42,215		—		(29,788	)		8,546		—			—			417			—			27,772			6,947
Saman Corporation		8,521		8,699		(733	)		—		—			—			26			(6,738	)		—			1,254
Woori Growth Partnerships New Technology Private Equity Fund		13,602		13,118		(582	)		15,729		(498	)		—			(156	)		—			—			27,611
2016KIF-IMM Woori Bank Technology Venture Fund		1,800		1,800		—			5,040		—			—			—			—			—			6,840
K BANK Co., Ltd.		32,500		30,442		(11,381	)		12,892		—			—			(245	)		—			27			31,735
Smart Private Equity Fund No.2		3,000		—		(68	)		3,000		—			—			—			—			—			2,932
Woori Bank-Company K Korea Movie Asset Fund		1,500		—		(43	)		3,000		—			—			—			—			—			2,957
Well to Sea No.3 Private Equity Fund		102,500		—		80,894			102,500		(508	)		—			(577	)		—			—			182,309
Woori Renaissance Holdings		—		54,422		(622	)		—		—			(57,109	)		—			—			3,309			—
Nomura-Rifa Private Real Estate Investment Trust No.17		1,000		—		(61	)		1,000		—			—			—			—			—			939
		592,148		439,012		13,389			192,760		(70,946	)		(60,621	)		6,663			(114,903	)		11,697			417,051

(*1) AFS financial assets decreased by 5,421 million Won due to transfers to investments in associates during the year ended December 31, 2016.

(*2) The transfers from investments in associates to AFS financial assets amounted to 155,220 million Won and the transfers from investments in associates to assets held for sale amounted to 6,909 million Won during the year ended December 31, 2016.

(*3) Investments in associates increased by 83,002 million Won due to transfers between accounts, such as loan-equity swap occurred during the year ended December 31, 2015.

(*4) Changes in investments in joint ventures and associates due to debt-equity swap is 51,227 million Won during the year ended December 31, 2017.

(*5) The Investments in Associates reclassified as assets held for sale amount to 62,571 million Won, of which 16,354 million Won was disposed of during the year ended December 31, 2017.

(3) Financial information relating to investments in joint ventures and associates accounted for using the equity method of accounting is as follows (Unit: Korean Won in millions):

	December 31, 2016
	Assets		Liabilities		Operating revenue		Net income (loss)
Woori Blackstone Korea Opportunity No.1 Private Equity Fund		57,971		427		75,084		38,226
Kumho Tire Co., Inc.		5,079,740		3,914,306		2,156,667		(53,328	)
Woori Service Networks Co., Ltd.		4,722		1,782		14,875		801
Korea Credit Bureau Co., Ltd.		71,245		17,322		59,868		3,517
Korea Finance Security Co., Ltd.		32,262		9,759		52,657		700
Chin Hung International Inc.		421,710		354,995		578,640		794
Poonglim Industrial Co., Ltd.		304,718		323,765		156,770		(15,135	)
STX Engine Co., Ltd.		865,265		769,481		372,295		(22,978	)
Samho Co., Ltd.		740,786		489,130		909,927		68,077
STX Corporation		781,622		1,087,469		1,252,968		(378,782	)
Saman Corporation		83,380		47,175		72,850		2,746
Woori Growth Partnerships New Technology Private Equity Fund		57,339		493		37		(2,177	)
2016KIF-IMM Woori Bank Technology Venture Fund		9,005		254		5		(250	)
K BANK Co., Ltd.		239,806		5,633		2,927		(12,222	)
Woori Renaissance Holdings Inc.		127,411		26,703		37,206		33,508
Woori Columbus 1st Private Equity Fund		811		506		3,764		(450	)

	December 31, 2017
	Assets		Liabilities		Operating revenue		Net income (loss)
Kumho Tire Co., Inc.		5,105,107		3,928,327		2,136,569		(61,748	)
Woori Service Networks Co., Ltd.		4,982		1,780		14,887		1,003
Korea Credit Bureau Co., Ltd.		75,504		19,323		68,750		3,580
Korea Finance Security Co., Ltd.		33,915		10,461		55,610		1,071
Chin Hung International Inc.		341,284		259,454		513,285		28,698
Poonglim Industrial Co., Ltd.		241,063		309,925		107,360		(29,812	)
STX Corporation		595,348		543,458		1,371,272		342,869
Saman Corporation		98,435		69,929		76,135		(6,096	)
Woori Growth Partnerships New Technology Private Equity Fund		120,133		485		1,024		(3,199	)
2016KIF-IMM Woori Bank Technology Venture Fund		32,815		380		6		(1,515	)
K BANK Co., Ltd.		1,244,270		1,001,121		19,231		(74,403	)
Smart Private Equity Fund No.2		14,711		51		1		(340	)
Woori Bank-Company K Korea Movie Asset Fund		11,830		2		16		(172	)
Well to Sea No.3 Private Equity Fund		5,068,424		4,534,957		131,488		162,743
Nomura-Rifa Private Real Estate Investment Trust No.17		20,265		16,507		62		(242	)

(4) The entities that the Group has not applied equity method of accounting although the Group’s ownership ratio is more than 20% as of December 31, 2016 and 2017, are as follows:

	As of December 31, 2016
	Number of shares owned		Ownership (%)
Orient Shipyard Co., Ltd.(*)		465,050		23.0	%
Saenuel Co., Ltd.(*)		3,531		37.4	%
E Mirae Tech Co., Ltd.(*)		7,696		41.0	%
Jehin Trading Co., Ltd.(*)		81,610		27.3	%
NK Eng Co., Ltd.(*)		697,033		23.1	%
The season Co., Ltd.(*)		18,187		30.1	%
Yuil PESC Co., Ltd.(*)		8,642		24.0	%
Youngdong Sea Food Co., Ltd.(*)		12,106		24.0	%
Sinseong Trading Co., Ltd.(*)		2,584		27.2	%
Reading Doctors Co., Ltd.(*)		7,398		35.4	%
PREXCO Co., Ltd.(*)		919,972		28.1	%
Hyunwoo International Co., Ltd.(*)		59,873		25.9	%

	As of December 31, 2017
	Number of shares owned		Ownership (%)
Orient Shipyard Co., Ltd.(*)		465,050		21.4	%
Saenuel Co., Ltd.(*)		3,531		37.4	%
E Mirae Tech Co., Ltd.(*)		7,696		41.0	%
Jehin Trading Co., Ltd.(*)		81,610		27.3	%
The season Co., Ltd.(*)		18,187		30.1	%
Yuil PESC Co., Ltd.(*)		8,642		24.0	%
Youngdong Sea Food Co., Ltd.(*)		12,106		24.0	%
Sinseong Trading Co., Ltd.(*)		2,584		27.2	%
CL Tech Co., Ltd.(*)		13,759		38.6	%
Force TEC Co., Ltd.(*)		4,780,907		25.8	%
Protronics Co., Ltd.(*)		95,921		48.1	%
Instern Co., Ltd.(*)		14,296		20.1	%

(*) Even though the Group’s ownership interest of the entity is more than 20%, the Group does not have significant influence over the entity since it is going through work-out process under receivership, thus it is excluded from the investment in associates.

(5) As of December 31, 2015, 2016 and 2017, the reconciliations from the net assets of associates based on the ownership ratio of the Group to its corresponding book value of investment in joint ventures and associates are as follows (Unit: Korean Won in millions except for ownership):

	As of December 31, 2015
	Total net asset			Ownership (%)		Net assets of associates (or joint ventures)			cost-book value differential(*1)		Impairment			Intercompany transaction and others			Book value
Woori Blackstone Korea Opportunity Private Equity Fund No.1		211,757			26.4		55,900			—		—			144			56,044
Kumho Tire Co., Inc.(*2)		1,152,161			14.2		163,042			48,459		—			2,549			214,050
Woori Service Networks Co., Ltd.		2,805			4.9		139			—		—			—			139
Korea Credit Bureau		50,884			9.9		5,043			248		—			—			5,291
Korea Finance Security Co., Ltd.		24,738			15.0		3,711			—		—			—			3,711
United PF 1st Corporate financial stability		1,057,935			17.7		187,538			—		—			54			187,592
Chin Hung International Inc.(*2)		68,132			28.4		19,374			24,566		—			(4	)		43,936
Poonglim Industrial Co., Ltd.(*2)		(58,065	)		30.7		(17,837	)		45,622		(22,472	)		—			5,313
STX Engine Co., Ltd.(*2)		123,969			29.2		36,230			14,927		—			119			51,276
SamHo Co., Ltd.		182,730			7.8		14,325			—		—			—			14,325
STX Corporation		50,421			15.0		7,552			24,610		(28,370	)		459			4,251
Osung LST Co., Ltd.		82,878			11.1		9,238			35,597		(33,839	)		(11	)		10,985
Saman Corporation		31,636			9.2		2,911			5,610		—			—			8,521
Woori Renaissance Holdings		67,203			51.6		34,677			—		(6,441	)		8,885			37,121
Woori Columbus First PEF		67,904			1.9		1,304			6		—			(4	)		1,306

	As of December 31, 2016
	Total net asset			Ownership (%)		Net assets of associates (or joint ventures)			cost-book value differential(*1)		Impairment			Intercompany transaction and others			Book Value
Woori Blackstone Korea Opportunity Private Equity Fund No.1		57,544			26.4		15,191			—		—			98			15,289
Kumho Tire Co., Inc.(*2)		1,055,219			14.2		149,324			48,459		—			2,549			200,332
Woori Service Networks Co., Ltd.		2,940			4.9		145			—		—			—			145
Korea Credit Bureau		53,923			9.9		5,344			248		—			—			5,592
Korea Finance Security Co., Ltd.		22,503			15.0		3,376			—		—			—			3,376
Chin Hung International Inc.(*2)		65,387			28.4		18,593			24,565		—			(126	)		43,032
Poonglim Industrial Co., Ltd.(*2)		(111,156	)		31.0		(34,463	)		54,149		(21,062	)		1,376			—
STX Engine Co., Ltd.		95,784			29.2		28,002			14,954		—			80			43,036
SamHo Co., Ltd.		251,656			7.8		19,729			—		—			—			19,729
STX Corporation(*2)		(250,018	)		9.5		(23,633	)		24,614		(27,904	)		26,923			—
Saman Corporation		36,205			9.2		3,326			5,373		—			—			8,699
Woori Growth Partnerships New Technology Private Equity Fund		56,846			23.1		13,118			—		—			—			13,118
2016KIF-IMM Woori Bank Technology Venture Fund		8,751			20.0		1,750			—		—			50			1,800
K BANK Co.,Ltd.		234,173			13.0		30,442			—		—			—			30,442
Woori Renaissance Holdings		100,708			51.6		51,965			—		(6,441	)		8,898			54,422
Woori Columbus First PEF		305			2.0		6			—		—			(6	)		—

	As of December 31, 2017
	Total net asset			Ownership (%)		Net assets of associates (or joint ventures)			Cost-book value differential(*1)		Impairment			Intercompany transaction and others			Book value
Kumho Tire Co., Inc.(*2 and *3)		1,065,421			14.2		150,767			48,459		(102,843	)		2,550			98,933
Woori Service Networks Co., Ltd.		3,202			4.9		158			—		—			—			158
Korea Credit Bureau Co., Ltd.		56,181			9.9		5,568			248		—			—			5,816
Korea Finance Security Co., Ltd.		23,454			15.0		3,519			—		—			—			3,519
Chin Hung International Inc.(*2)		81,686			25.3		20,671			24,565		—			(135	)		45,101
Poonglim Industrial Co., Ltd.(*2)		(168,154	)		29.4		(49,446	)		54,542		(20,504	)		15,408			—
STX Corporation		51,890			19.7		10,232			24,614		(27,904	)		5			6,947
Saman Corporation		28,506			9.2		2,619			5,373		(6,738	)		—			1,254
Woori Growth Partnerships New Technology Private Equity Fund		119,648			23.1		27,611			—		—			—			27,611
2016KIF-IMM Woori Bank Technology Venture Fund		32,435			20.0		6,487			—		—			353			6,840
K BANK Co., Ltd.		243,149			13.0		31,535			—		—			200			31,735
Smart Private Equity Fund No.2		14,660			20.0		2,932			—		—			—			2,932
Woori Bank-Company K Korea Movie Asset Fund		11,828			25.0		2,957			—		—			—			2,957
Well to Sea No.3 Private Equity Fund(*2)		364,909			50.0		182,366			—		—			(57	)		182,309
Nomura-Rifa Private Real Estate Investment Trust No.17		3,758			25.0		939			—		—			—			939

(*1) It is attributed as the difference between the acquisition cost and the corresponding net asset when the Group acquired the associates.

(*2) The net asset amount is after considering preferred stocks, debt-equity swap and others.

(*3) The Group recognized 102,843 million of impairment loss on the investment due to a significant and prolonged decline in the stock price of the investment below its book value.

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Investment Properties

12 Months Ended

Dec. 31, 2017

Disclosure Of Investment Property [Abstract]

Investment Properties

14. INVESTMENT PROPERTIES

(1) Investment properties are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Acquisition cost		387,675			404,741
Accumulated depreciation		(29,178	)		(33,440	)
Net carrying value		358,497			371,301

(2) Changes in investment properties are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		357,550			351,496			358,497
Acquisition		—			4,428			9,872
Disposal		—			—			(458	)
Depreciation		(3,806	)		(3,762	)		(3,902	)
Transfer		(2,297	)		6,314			2,472
Classified to assets held for sale		—			—			(371	)
Foreign currencies translation adjustments		49			21			(324	)
Others		—			—			5,515
Ending balance		351,496			358,497			371,301

(3) Fair value of investment properties, which is determined by reference to Officially Assessed Reference Land Price (OARLP), announced by Ministry of Land, Transport and Maritime Affairs, and recent market transactions of similar, recently sold parcels nearby the subject properties in order to derive an indication of the most probable sales price (or value) of the subject properties, is amounting to 382,370 million Won and 396,587 million Won as of December 31, 2016 and 2017, respectively. The fair value of investment property, based on the assessment that was independently performed by external appraisal agencies, is classified as level 3 on the fair value hierarchy as of December 31, 2016 and 2017.

(4) Rental fee earned from investment properties is amounting to 5,629 million Won, 5,027 million Won and 4,579 million Won for the years ended December 31, 2015, 2016 and 2017, respectively.

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Premises and Equipment

12 Months Ended

Dec. 31, 2017

Disclosure Of Property Plant And Equipment [Abstract]

Premises And Equipment

15. PREMISES AND EQUIPMENT

(1) Premises and equipment are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Land		Building			Properties for business use			Structures in leased office			Construction in progress		Structures			Total
Acquisition cost		1,488,745		855,332			1,010,141			424,562			18,717		20			3,797,517
Accumulated depreciation		—		(163,633	)		(820,239	)		(355,604	)		—		(16	)		(1,339,492	)
Net carrying value		1,488,745		691,699			189,902			68,958			18,717		4			2,458,025

	December 31, 2017
	Land		Building			Properties for business use			Structures in leased office			Construction in progress		Structures			Total
Acquisition cost		1,487,278		867,804			1,024,186			429,665			64,559		20			3,873,512
Accumulated depreciation		—		(186,958	)		(844,114	)		(364,878	)		—		(17	)		(1,395,967	)
Net carrying value		1,487,278		680,846			180,072			64,787			64,559		3			2,477,545

(2) Changes in premises and equipment are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Land			Building			Properties for business use			Structures in leased office			Construction in progress			Structures			Total
Beginning balance		1,514,698			706,524			209,588			70,185			102			5			2,501,102
Acquisition		2,628			21,127			69,230			35,304			757			—			129,046
Disposal		(10,780	)		(648	)		(847	)		(2,000	)		(313	)		—			(14,588	)
Depreciation		—			(24,846	)		(85,279	)		(36,740	)		—			(1	)		(146,866	)
Classified to assets held for sale		(5,109	)		(8,348	)		—			—			—			—			(13,457	)
Foreign currencies translation adjustment		(328	)		(333	)		265			515			(19	)		—			100
Transfer		(7,481	)		9,778			—			—			—			—			2,297
Others		—			763			334			12,480			(5	)		—			13,572
Ending balance		1,493,628			704,017			193,291			79,744			522			4			2,471,206

	For the year ended December 31, 2016
	Land			Building			Properties for business use			Structures in leased office			Construction in progress			Structures		Total
Beginning balance		1,493,628			704,017			193,291			79,744			522			4		2,471,206
Acquisition		—			15,939			74,336			19,615			21,231			—		131,121
Disposal		(30	)		(1,474	)		(233	)		(2,623	)		(102	)		—		(4,462	)
Depreciation		—			(24,887	)		(82,445	)		(48,587	)		—			—		(155,919	)
Classified to assets held for sale		(4,063	)		(251	)		—			—			—			—		(4,314	)
Foreign currencies translation adjustment		625			516			307			376			153			—		1,977
Acquisition through business combination		—			—			209			442			—			—		651
Transfer		(1,415	)		(1,557	)		—			—			(3,087	)		—		(6,059	)
Others		—			(604	)		4,437			19,991			—			—		23,824
Ending balance		1,488,745			691,699			189,902			68,958			18,717			4		2,458,025

	For the year ended December 31, 2017
	Land			Building			Properties for business use			Structures in leased office			Construction in progress			Structures			Total
Beginning balance		1,488,745			691,699			189,902			68,958			18,717			4			2,458,025
Acquisition		4,755			22,579			59,694			23,420			51,797			—			162,245
Disposal		(1,840	)		(2,593	)		(442	)		(1,231	)		—			—			(6,106	)
Depreciation		—			(26,156	)		(74,223	)		(31,728	)		—			(1	)		(132,108	)
Classified from(to) assets held for sale		(2,693	)		(1,059	)		549			—			—			—			(3,203	)
Foreign currencies translation adjustment		(1,493	)		(1,393	)		(2,023	)		(1,315	)		(402	)		—			(6,626	)
Transfer		(196	)		(2,134	)		5,411			—			(5,553	)		—			(2,472	)
Others		—			(97	)		1,204			6,683			—			—			7,790
Ending balance		1,487,278			680,846			180,072			64,787			64,559			3			2,477,545

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Intangible Assets and Goodwill

12 Months Ended

Dec. 31, 2017

Disclosure Of Intangible Assets [Abstract]

Intangible Assets And Goodwill

16. INTANGIBLE ASSETS AND GOODWILL

(1) Intangible assets are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Goodwill		Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Acquisition cost		124,803		185,202			714			299,031			622,540			26,884			1,259,174
Accumulated amortization		—		(149,725	)		(401	)		(160,335	)		(458,088	)		—			(768,549	)
Accumulated impairment losses		—		—			—			—			(88	)		(6,798	)		(6,886	)
Net carrying value		124,803		35,477			313			138,696			164,364			20,086			483,739

	December 31, 2017
	Goodwill		Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Acquisition cost		108,707		203,418			1,063			413,296			634,150			27,337			1,387,971
Accumulated amortization		—		(162,746	)		(524	)		(182,846	)		(516,467	)		—			(862,583	)
Accumulated impairment losses		—		—			—			—			(137	)		(6,652	)		(6,789	)
Net carrying value		108,707		40,672			539			230,450			117,546			20,685			518,599

(2) Changes in intangible assets are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Goodwill			Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Beginning balance		107,541			47,821			328			55,337			60,807			23,894			295,728
Acquisition		—			7,347			96			16,751			196,139			2,510			222,843
Disposal		—			(189	)		—			(1,500	)		(12	)		—			(1,701	)
Amortization		—			(16,809	)		(81	)		(19,233	)		(53,969	)		—			(90,092	)
Impairment losses		—			—			—			—			(9	)		(1,911	)		(1,920	)
Foreign currencies translation adjustment		(4,016	)		1			1			2			(476	)		147			(4,341	)
Others		—			—			—			—			(711	)		—			(711	)
Ending balance		103,525			38,171			344			51,357			201,769			24,640			419,806

	For the year ended December 31, 2016
	Goodwill		Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Beginning balance		103,525		38,171			344			51,357			201,769			24,640			419,806
Acquisition		—		8,708			64			92,969			30,842			2,306			134,889
Disposal		—		—			—			—			(23	)		(3,785	)		(3,808	)
Amortization		—		(15,795	)		(95	)		(18,657	)		(57,803	)		—			(92,350	)
Impairment losses		—		—			—			—			3,230			(1,585	)		1,645
Foreign currencies translation adjustment		7,338		16			—			—			853			50			8,257
Acquisition through business combination		7,857		162			—			—			—			43			8,062
Others		6,083		4,215			—			13,027			(14,504	)		(1,583	)		7,238
Ending balance		124,803		35,477			313			138,696			164,364			20,086			483,739

	For the year ended December 31, 2017
	Goodwill			Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Beginning balance		124,803			35,477			313			138,696			164,364			20,086			483,739
Acquisition		105			9,722			349			122,849			22,531			1,867			157,423
Disposal		—			—			—			—			(37	)		(944	)		(981	)
Amortization		—			(16,258	)		(123	)		(22,534	)		(60,869	)		—			(99,784	)
Impairment losses		—			—			—			—			(78	)		(159	)		(237	)
Transfer		—			7,987			—			(7,987	)		—			—			—
Foreign currencies translation adjustment		(16,201	)		(952	)		—			(483	)		(2,742	)		(160	)		(20,538	)
Others		—			4,696			—			(91	)		(5,623	)		(5	)		(1,023	)
Ending balance		108,707			40,672			539			230,450			117,546			20,685			518,599

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Assets Held for sale

12 Months Ended

Dec. 31, 2017

Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [Abstract]

Assets Held for Sale

17. ASSETS HELD FOR SALE

Assets held for sale are as follows (Unit: Korean Won in millions):

	December 31, 2017		December 31, 2016
Investments in joint ventures and associates(*)		46,217		—
Premises and equipment		2,407		2,342
Total		48,624		2,342

(*) The shares of STX Engine Co., Ltd. owned by the Group are reclassified as assets held for sale, as the creditor financial institutions committee has entered into a contract with UAMCO., Ltd for the year ended December 31, 2017, to sell STX Engine Co., Ltd. shares.

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Assets Subject to Lien and Assets Acquired Through Foreclosures

12 Months Ended

Dec. 31, 2017

Disclosure Of Collateral [Abstract]

Assets Subject To Lien And Assets Acquired Through Foreclosures

18. ASSETS SUBJECT TO LIEN AND ASSETS ACQUIRED THROUGH FORECLOSURES

(1) Assets subjected to lien are as follows (Unit: Korean Won in millions):

		December 31, 2016
		Collateral given to	Amount		Reason for collateral
Loan and receivables	Due from banks in local currency	Samsung Securities and others		24,589	Margin deposit for futures and options and others
	Due from banks in foreign currencies	Korea Investment & Securities and others		227,249	Foreign margin deposit for future or option and others
Financial assets at FVTPL	Industrial and financial debt securities and others	Yuanta Securities and others		473,476	Substitute securities and others
AFS financial assets	Korean treasury and government agencies bonds	Korea Securities Depository and others		2,546,683	Related to bonds sold under repurchase agreements(*)
	Financial institutions debt securities and others	The BOK and others		836,522	Settlement risk and others
HTM financial assets	Korean treasury and government agencies bonds	Korea Securities Depository and others		7,133	Related to bonds sold under repurchase agreements(*)
	Korean treasury and government agencies bonds and others	The BOK and others		6,185,295	Settlement risk and others
Lands and buildings		Credit Counselling & Recovery Service and others		6,310	Leasehold rights and others
		Total		10,307,257

		December 31, 2017
		Collateral given to	Amount		Reason for collateral
Loan and receivables	Due from banks on time in local currency	Bank of China and others		6,629	Collaterals for issuing letter of guarantee and others
	Due from banks in local currency	Samsung Securities Co., Ltd. and others		10,809	Margin deposit for futures or option
	Due from banks in foreign currencies	Korea Investment & Securities Co., Ltd. and others		9,136	Foreign margin deposit for future or option and others
Financial assets at FVTPL	Financial institutions debt securities and others	Yuanta Securities Co., Ltd. and others		501,523	Substitute securities and others
AFS financial assets	Corporate bonds	Korea Securities Depository and others		9,998	Related to bonds sold under repurchase agreements(*)
	Korean treasury and government agencies bonds and others	The BOK and others		1,570,608	Settlement risk and others
HTM financial assets	Korean treasury and government agencies bonds	Korea Securities Depository		5,436	Related to bonds sold under repurchase agreements(*)
	Financial institutions debt securities and others	The BOK and others		7,605,292	Settlement risk and others
Lands and buildings	Land and building	Credit Counselling & Recovery Service and others		6,186	Leasehold rights and others
		Total		9,725,617

(*) The Group enters into the repurchase agreements at predetermined price or original sale price added with certain rate of return after the disposal of securities. In this regards, the securities are provided as collaterals, and the purchasers are eligible to dispose or provide them as collateral. Therefore, as such securities have been transferred but have not been derecognized, the Group recognizes the relevant amount as liability (bond sold under repurchase agreements).

(2) The carrying amounts of buildings acquired through foreclosure are as follow (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Land		4,138		332
Building		1,852		44
Properties not used in business		202		—
Total		6,192		376

(3) Loaned securities are as follows (Unit: Korean Won in millions):

		December 31, 2016		December 31, 2017		Loaned to
Financial assets at FVTPL	Korean Equity securities		4,459		—	Samsung Securities Co., Ltd. and others
AFS financial assets	Korean treasury and government agencies bonds and others		493,579		170,256	Korea Securities Depository and others
Total			498,038		170,256

Loaned securities are lending of specific securities to borrowers who agree to return the same quantity of the same security at the end of lending period. As the Group does not derecognize these securities, there are no liabilities related to loaned securities.

(4) Collaterals held that can be disposed and re-collateralized regardless of defaults of counterparties

Fair values of collaterals held can be disposed and re-subjected to lien regardless of defaults of counterparties as of December 31, 2016 and 2017 are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Fair values of collaterals	Fair values of collaterals were disposed or re-subjected to lien
Securities	8,746,101	—

	December 31, 2017
	Fair values of collaterals	Fair values of collaterals were disposed or re-subjected to lien
Securities	17,671,490	—

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Other Assets

12 Months Ended

Dec. 31, 2017

Miscellaneous assets [Abstract]

Other Assets

19. OTHER ASSETS

Other assets are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Prepaid expenses		111,445		130,245
Advance payments		1,944		18,363
Non-operative assets		6,192		376
Others		9,265		9,420
Total		128,846		158,404

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Financial Liabilitiy at Fair Value Through Profit or Loss

12 Months Ended

Dec. 31, 2017

Financial liabilities at fair value through profit or loss [Abstract]

Disclosure of financial liabilities at fair value through profit or loss [Text block]

20. FINANCIAL LIABILITY AT FVTPL

(1) Financial liabilities at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Financial liabilities held for trading		3,036,478		3,176,113
Financial liabilities designated at FVTPL		766,880		251,796
Total		3,803,358		3,427,909

(2) Financial liabilities held for trading are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Deposits due to Customers:
Gold banking liabilities		26,501		25,964
Derivative liabilities		3,009,977		3,150,149
Total		3,036,478		3,176,113

(3) Financial liabilities designated at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Equity linked securities index:
Equity linked securities index in short position		673,906		160,057
Debentures:
Debentures in local currency		92,974		91,739
Total		766,880		251,796

(4) Credit risk adjustments to financial liabilities designated at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2015			December 31, 2016			December 31, 2017
Financial liabilities designated at FVTPL subject to credit risk adjustments		854,862			766,880			251,796
Credit risk adjustments(*1)		(433	)		(8	)		(254	)
Accumulated changes in credit risk adjustments(*2)		311			349			133

(*1) The amounts in the tabular disclosure relating to Credit risk adjustments at 31 December 2016 and at 31 December 2015 have been restated by 811 million Won and 109 million Won, respectively, due to an error in the previous year’s disclosure.

(*2) The amounts in the tabular disclosure relating to Accumulated changes in credit risk adjustments at 31 December 2016 and at 31 December 2015 have been restated by 16,139 million Won and 15,327 million Won, respectively, due to an error in the previous year’s disclosure.

Credit risk adjustments are applied to reflect the Group’s own credit risk when measuring the fair value of derivative liabilities. The methodology to determine the adjustment incorporates the Group’s credit spread as observed through credit ratings.

(5) The differences between financial liabilities at FVTPL’s carrying amount and nominal amount at maturity are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Carrying amount		766,880			251,796
Nominal amount at maturity		902,375			255,408
Difference		(135,495	)		(3,612	)

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Deposits Due to Customers

12 Months Ended

Dec. 31, 2017

Deposits from customers [Abstract]

Deposits Due To Customers

21. DEPOSITS DUE TO CUSTOMERS

Deposits sorted by interest type are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Deposits in local currency
Demand deposits		9,491,680			9,349,070
Time deposits		183,723,369			194,292,679
Mutual funds		37,128			34,055
Deposits on notes payables		943,446			1,323,679
Deposits on CMA		203,013			164,431
Certificate of deposits		3,836,430			4,436,443
Other deposits		1,360,176			1,451,841
Sub-total		199,595,242			211,052,198
Deposits in foreign currencies		21,453,096			23,682,896
Present value discount		(27,927	)		(40,010	)
Total		221,020,411			234,695,084

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Borrowings and Debentures

12 Months Ended

Dec. 31, 2017

Borrowings [Abstract]

Borrowings And Debentures

22. BORROWINGS AND DEBENTURES

(1) Borrowings are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Lenders	Interest rate (%)		Amount
Borrowings in local currency:
Borrowings from the Bank of Korea	The Bank of Korea		0.5 ~ 0.8		1,598,553
Borrowings from government funds	Small and Medium Business Corporation and others		0.0 ~ 3.5		1,534,807
Others	Seoul Metropolitan Government and others		0.0 ~ 3.8		3,922,878
Sub-total					7,056,238
Borrowings in foreign currencies:
Borrowings in foreign currencies	The Export-Import Bank of Korea and others		0.0 ~ 5.2		7,737,237
Offshore borrowings in foreign currencies	Wells Fargo		1.4		18,128
Sub-total					7,755,365
Bills sold	Others		0.0 ~ 1.6		26,895
Call money	Bank and others		0.0 ~ 5.1		1,926,779
Bonds sold under repurchase agreements	Other financial institutions		0.0 ~ 4.5		2,004,905
Present value discount					(667	)
Total					18,769,515

	December 31, 2017
	Lenders	Interest rate (%)		Amount
Borrowings in local currency:
Borrowings from The BOK	The BOK		0.5 ~ 0.8		1,404,087
Borrowings from government funds	Small Enterprise And Market Service and others		0.0 ~ 2.9		1,723,340
Others	The Korea Development Bank and others		0.0 ~ 3.2		3,957,421
Sub-total					7,084,848
Borrowings in foreign currencies:
Borrowings in foreign currencies	The Export-Import BOK and others		0.0 ~ 6.8		6,996,551
Offshore borrowings in foreign currencies	Commonwealth Bank		1.8		28,285
Sub-total					7,024,836
Bills sold	Others		0.0 ~ 1.2		36,953
Call money	Bank and others		1.5 ~ 2.7		635,061
Bonds sold under repurchase agreements	Other financial institutions		0.6 ~ 12.7		3,173
Present value discount					(165	)
Total					14,784,706

(2) Debentures are as follows (Unit: Korean Won in millions):

	December 31, 2016					December 31, 2017
	Interest rate (%)		Amount			Interest rate (%)		Amount
Face value of bond(*)
Ordinary bonds		1.5 ~ 11.8		18,268,403			1.5 ~ 5.8		22,468,908
Subordinated bonds		3.0 ~ 12.6		5,327,335			3.4 ~ 12.6		4,781,301
Other bonds		17.0		4,006			1.6 ~ 17.0		649,615
Sub-total				23,599,744					27,899,824
Discounts on bond				(34,295	)				(30,173	)
Total				23,565,449					27,869,651

(*) Included debentures under fair value hedge relationships are 3,610,193 million Won and 3,102,386 million Won as of December 31, 2016 and 2017, respectively. Also, debentures under cash flow hedge amounting to 699,029 million Won are included as of December 31, 2017

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Provisions

12 Months Ended

Dec. 31, 2017

Provisions [Abstract]

Provisions

23. PROVISIONS

(1) Provisions are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Asset retirement obligation		58,076		61,872
Provision for guarantee (*1)		238,117		183,247
Provision for loan commitments		87,909		66,115
Provisions for customer reward credits		22,093		40,445
Other provisions (*2)		22,282		58,791
Total		428,477		410,470

(*1) Provision for guarantee includes provision for financial guarantee of 67,557 million Won and 71,697 million Won as of December 31, 2016 and 2017, respectively.

(*2) Other provisions consist of provision for litigation, provision for loss recovery, and others.

(2) Changes in provisions except for asset retirement obligation are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Provision for guarantees			Provision for loan commitments			Provisions for customer reward credits			Other provisions			Total
Beginning balance		509,320			90,449			5,548			56,959			662,276
Provisions provided		19,714			9,801			16,301			51,997			97,813
Provisions used and others		(25,262	)		41			(16,404	)		(86,308	)		(127,933	)
Reversal of unused amount		(160,032	)		(14,976	)		—			(43	)		(175,051	)
Others		20,401			(2	)		—			(24	)		20,375
Ending balance		364,141			85,313			5,445			22,581			477,480

	For the year ended December 31, 2016
	Provision for guarantees			Provision for loan commitments			Provisions for customer reward credits			Other provisions			Total
Beginning balance		364,141			85,313			5,445			22,581			477,480
Provisions provided		4,281			8,502			23,525			8,034			44,342
Provisions used and others		(80,017	)		22			(8,158	)		(11,323	)		(99,476	)
Reversal of unused amount		(64,061	)		(5,409	)		—			—			(69,470	)
Foreign currencies translation adjustments		—			—			—			2,990			2,990
Transfer(*1)		—			—			503			—			503
Others		13,773			(519	)		778			—			14,032
Ending balance		238,117			87,909			22,093			22,282			370,401

	For the year ended December 31, 2017
	Provision for guarantees			Provision for unused commitments			Provisions for customer reward credits			Other provisions			Total
Beginning balance		238,117			87,909			22,093			22,282			370,401
Provisions provided		4,876			2,028			62,593			42,042			111,539
Provisions used and others		(24,898	)		(68	)		(84,979	)		(8,014	)		(117,959	)
Reversal of unused amount		(60,300	)		(23,744	)		—			(77	)		(84,121	)
Foreign currencies translation adjustments		9			(10	)		—			(249	)		(250	)
Transfer(*2)		—			—			21,808			—			21,808
Others		25,443			—			18,930			2,807			47,180
Ending balance		183,247			66,115			40,445			58,791			348,598

(*1) As the credits of the affiliates were transferred to the Group, the allowance for the provisions for customer reward credits increased, for the year ended December 31, 2016.

(*2) According to contracts with the third parties, the Group ultimately will be reimbursed for which it has paid out on behalf of customers, which has incurred through their customer loyalty programs. Therefore, when such obligation incurs, the Group recognizes it as “transfer”, but there is no impact on the Group’s expense.

(3) Changes in asset retirement obligation are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		29,733			39,121			58,076
Provisions provided		1,742			2,034			2,225
Provisions used		(1,316	)		(1,279	)		(1,283	)
Amortization		394			464			428
Reversal of unused amount		(179	)		(1	)		(733	)
Increase in restoration costs and others		8,747			17,737			3,159
Ending balance		39,121			58,076			61,872

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Net Defined Benefits Liability (Asset)

12 Months Ended

Dec. 31, 2017

Disclosure of defined benefit plans [Abstract]

Net Defined Benefits Liability (Asset)

24. NET DEFINED BENEFIT LIABILITY (ASSET)

The characteristics of the Group’s defined benefit retirement pension plans characteristics are as follows:

Employees and directors with one or more years of service are entitled to receive a payment upon retirement of their employment, based on their length of service and rate of pay at the time of retirement. The assets of the plans are measured at their fair value at the end of reporting date. The plan liabilities are measured using the projected unit method, which takes account of projected earnings increases, using actuarial assumptions that give the best estimate of the future cash flows that will arise under the plan liabilities.

The Group is exposed to various risks through defined benefit retirement pension plan, and the most significant risks are as follows:

Volatility of Asset

The defined benefit obligation was estimated with a discount rate which is calculated based on the yield of blue chip corporate bonds in Korea. A deficit may occur if the rate of return on plan assets falls short of the discount rate. The plan assets include equity instruments and are exposed to the related volatility and risks.

Decrease in Yield of Blue Chip Bonds

A decrease in yield of blue chip bonds may result in increase in defined benefit liability although the increase in the value of some debt securities in the defined benefit plan would set it off partially.

Risk of Inflation

Defined benefit obligations are correlated to the inflation rate; the higher the inflation rate is, the more the liabilities are recognized mainly due to the fact that inflation rate would result in increase of employee salary growth rate. As a result, a deficit may occur in the plan. However, the plan assets are less impacted since the plan assets consist of mainly debt securities with fixed rates and of equity instruments.

(1) The net defined benefit liability(asset) is as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Defined benefit obligation		984,381			1,071,170
Fair value of plan assets		(990,653	)		(1,027,906	)
Net defined benefit liability(asset)		(6,272	)		43,264

The details of the net defined benefit liability (asset) per major subsidiaries as of December 31, 2017 is as follows:

	Woori Bank Co, Ltd.		Woori Card		Woori FIS		Others		Total
Net Defined Benefit Asset				1,487						1,487
Net Defined Benefit Liability(*)		14,284				28,883		1,584		44,751

(*) This number is before adjusting for internal transaction. As most entities other than Woori Bank Co, Ltd, deposit their plan asset to Woori Bank, adjusting internal transaction, the Group’s plan asset should be decreased by 43,113 million Won.

(2) Changes in the carrying value of defined benefit obligation are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		683,961			901,219			984,381
Current service cost		132,710			153,660			146,750
Interest expense		21,377			24,326			26,629
Remeasurements		97,730			(52,402	)		(20,389	)
Foreign currencies translation adjustments		(8	)		80			(279	)
Retirement benefit paid		(26,516	)		(34,346	)		(55,552	)
Curtailment or settlement		(8,231	)		(9,536	)		(10,928	)
Others		196			1,380			558
Ending balance		901,219			984,381			1,071,170

(3) Changes in the plan assets are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		608,370			801,528			990,653
Interest income		21,965			25,038			30,601
Remeasurements		(5,444	)		(7,304	)		(14,125	)
Employer’s contributions		229,069			226,752			43,114
Retirement benefit paid		(22,860	)		(33,341	)		(51,877	)
Curtailment or liquidation		(8,240	)		(9,198	)		(11,052	)
Others		(21,332	)		(12,822	)		40,592
Ending balance		801,528			990,653			1,027,906

(4) Plan assets wholly consist of time deposits as of December 31, 2016 and 2017, respectively. Among plan assets, realized returns on plan assets amount to 16,521 million Won, 17,734 million Won, and 16,476 million Won for the years ended December 31, 2015, 2016 and 2017, respectively. Meanwhile, the contribution expected to be paid in the subsequent accounting year amounts to 125,818 million Won.

(5) The various plans are funded, with the relevant employers being responsible for their management. The Bank is responsible for around 92.4% of the Group’s defined benefit obligation as of December 31, 2017, and expects to make contributions to the plans amounting to 125,818 million Won during the year ended December 31, 2018. The expected contribution is calculated by actuaries based on prudent assessments of the amounts needed to fund the plans in accordance with local regulations.

(6) The analysis for the maturity, which is not discounted, of the defined benefit obligation of the Bank based on current wages is as following(Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Less than 1 year		48,132		53,718
1 year ~ less than 2 years		60,316		70,962
2 years ~ less than 5 years		159,238		156,561
5 years ~ less than 10 years		214,650		258,642
More than 10 years		436,417		449,738

As of December 31, 2017, the estimated average period until the commencement of payment is around 12.7 years.

(7) Current service cost, net interest expense (income), past service cost, loss (gain) on the curtailment or settlement, and loss (gain) due to remeasurements recognized in the consolidated statements of net income and total comprehensive income are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Current service cost		132,710			153,660			146,750
Net interest income		(588	)		(712	)		(3,972	)
Gain (loss) on the curtailment or settlement		9			(339	)		124
Cost recognized in net income		132,131			152,609			142,902
Remeasurements(*)		103,174			(45,098	)		(6,264	)
Cost recognized in total comprehensive income		235,305			107,511			136,638

(*) This is an amount before considering the tax effects.

Recognized retirement benefit service costs related to defined contribution plans are 3,623 million Won, 3,747 million Won and 3,946 million Won for the years ended December 31, 2015, 2016 and 2017, respectively.

(8) Key actuarial assumptions used in defined benefit liability assessment are as follows:

	December 31, 2015	December 31, 2016	December 31, 2017
Discount rate	2.83%	2.85%	3.18%
Future wage growth rate	6.35%	6.05%	6.18%
Retirement rate	Experience rate for each employment classification	Experience rate for each employment classification	Experience rate for each employment classification
Mortality rate	Issued by Korea Insurance Development Institute	Issued by Korea Insurance Development Institute	Issued by Korea Insurance Development Institute

(9) The sensitivity to actuarial assumptions used in the assessment of defined benefit obligation is as follows (Unit: Korean Won in millions):

		Change of defined benefit obligation as of
		December 31, 2016			December 31, 2017
Discount rate	Increase by 1% point		(107,203	)		(116,405	)
	Decrease by 1% point		125,395			137,151
Future wage growth rate	Increase by 1% point		124,766			136,707
	Decrease by 1% point		(108,344	)		(117,765	)

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Other Financial Liabilities and Other Liabilities

12 Months Ended

Dec. 31, 2017

Miscellaneous Liabilities [Abstract]

Disclosure of other financial liabilities and other liabilities [Text block]

25. OTHER FINANCIAL LIABILITIES AND OTHER LIABILITIES

Other financial liabilities and other liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Other financial liabilities:
Account payable		5,626,661			4,692,320
Accrued expenses		2,055,936			2,049,861
Borrowings from trust accounts		3,329,683			3,271,817
Agency business revenue		331,159			344,591
Foreign exchange payables		702,968			590,667
Domestic exchange payables		8,480,765			1,309,646
Other miscellaneous financial liabilities		1,458,747			1,635,156
Present value discount		(833	)		(1,597	)
Sub-total		21,985,086			13,892,461
Other liabilities:
Unearned Income		171,050			180,664
Other miscellaneous liabilities		128,326			103,317
Sub-total		299,376			283,981
Total		22,284,462			14,176,442

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Derivatives

12 Months Ended

Dec. 31, 2017

Disclosure of detailed information about hedges [Abstract]

Derivatives

26. DERIVATIVES

(1) Derivative assets and derivative liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016
			Assets				Liabilities
	Notional amount		Fair value hedge		For trading		Fair value hedge		For trading
Interest rate:
Futures		54,785		—		—		—		—
Swaps		118,582,511		139,832		470,057		7,013		509,686
Purchase options		860,000		—		21,172		—		—
Written options		1,035,000		—		—		—		21,863
Currency:
Futures		493,733		—		—		—		—
Forwards		62,539,094		—		1,265,852		—		1,015,380
Swaps		39,782,049		—		1,022,969		—		1,221,959
Purchase options		1,120,949		—		42,126		—		—
Written options		907,211		—		—		—		8,589
Equity:
Futures		926,392		—		—		—		—
Swaps		15,000		—		92		—		88
Purchase options		3,007,969		745		73,261		—		—
Written options		4,460,233		—		—		208		228,900
Others:
Futures		5,105		—		—		—		—
Swaps		7,918		—		2,645		—		2,331
Purchase options		8,307		—		121		—		—
Written options		64,352		—		—		—		1,181
Total		233,870,608		140,577		2,898,295		7,221		3,009,977

	December 31, 2017
			Assets						Liabilities
	Nominal amount		For cash flow hedge		For fair value hedge		For trading		For cash flow hedge		For fair value hedge		For trading
Interest rate:
Futures		75,845		—		—		—		—		—		—
Swaps		130,197,378		—		59,272		223,935		—		12,103		253,972
Purchase options		630,000		—		—		12,346		—		—		—
Written options		795,000		—		—		—		—		—		12,869
Currency:
Futures		318,217		—		—		—		—		—		—
Forwards		72,526,956		—		—		1,314,369		—		—		1,375,799
Swaps		48,176,306		—		—		1,352,924		55,651		—		1,347,905
Purchase options		2,291,154		—		—		64,267		—		—		—
Written options		4,038,237		—		—		—		—		—		58,687
Equity:
Futures		91,436		—		—		—		—		—		—
Swaps		15,000		—		—		103		—		—		10
Purchase options		5,060,706		—		—		146,775		—		—		—
Written options		4,504,290		—		—		—		—		—		99,770
Others:
Futures		—		—		—		—		—		—		—
Swaps		7,805		—		—		1,056		—		—		1,037
Purchase options		—		—		—		—		—		—		—
Written options		5,000		—		—		—		—		—		100
Total		268,733,330		—		59,272		3,115,775		55,651		12,103		3,150,149

Derivatives held for trading purpose are classified into financial assets or liabilities at FVTPL (see Notes 7 and 20) and derivatives for hedging are stated as a separate line item in the consolidated statements of financial position.

(2) Gains or losses from valuation of financial instruments under hedge accounting are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Gains or losses from hedged items		(31,297	)		98,827			110,152
Gains or losses from hedging instruments		38,021			(98,851	)		(109,447	)

The maximum period that the Group is exposed to cash flow risk arising from the hedging transaction discussed above will be terminated by February 2021.

Among gain (loss) on valuation of derivatives that was included in the accumulated other comprehensive income, 56,676 million Won has been reclassified to loss, before reduction of income tax effect for the year ended December 31, 2017.

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Deferred Day 1 Profit or Loss

12 Months Ended

Dec. 31, 2017

Disclosure Of Day One Profit Or Loss [Abstract]

Disclosure of day one profit or loss [Text block]

27. DEFERRED DAY 1 PROFIT OR LOSS

Changes in details of deferred day 1 profits or losses are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		13,499			28,008			13,422
Acquisitions		26,762			1,337			500
Amounts recognized in profits or losses		(12,253	)		(15,923	)		(6,506	)
Ending balance		28,008			13,422			7,416

In case some variables to measure fair values of financial instruments were not observable or available in the market, valuation techniques were utilized to evaluate such financial instruments. Those financial instruments were recorded at the fair value produced by the valuation techniques as at the time of acquisition, even though there were difference noted between the transaction price and the fair value. The table above presents the difference yet to be realized as profit or losses.

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Capital Stock and Capital Surplus

12 Months Ended

Dec. 31, 2017

Disclosure Of Issued Capital And Miscellaneous Equity [Abstract]

Disclosure of issued capital and miscellaneous equity [Text block]

28. CAPITAL STOCK AND CAPITAL SURPLUS

(1) The number of authorized shares and others are as follows:

	December 31, 2016	December 31, 2017
Authorized shares of common stock	5,000,000,000 Shares	5,000,000,000 Shares
Par value	5,000 Won	5,000 Won
Issued shares of common stock	676,000,000 Shares	676,000,000 Shares
Capital stock	3,381,392 million Won	3,381,392 million Won

(2) Changes in numbers of issued shares of common stock are as follows (Unit: Shares):

	December 31, 2015			December 31, 2016		December 31, 2017
Beginning balance		676,278,371			676,000,000		676,000,000
Retirement of treasury stock		(278,371	)		—		—
Ending balance		676,000,000			676,000,000		676,000,000

(3) Details of capital surplus are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Capital in excess of par value		269,533		269,533
Other capital surplus		16,798		16,347
Total		286,331		285,880

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Hybrid Securities

12 Months Ended

Dec. 31, 2017

Hybrid Instruments [Abstract]

Disclosure Of Hybrid Securities Explanatory

29. HYBRID SECURITIES

The bond-type hybrid securities classified as owner’s equity are as follows (Unit: Korean Won in millions):

	Issue date	Maturity	Interest rate (%)		December 31, 2016			December 31, 2017
Securities in local currency	June 20, 2008	June 20, 2038		7.7		255,000			255,000
	March 8, 2012	March 8, 2042		5.8		190,000			—
	April 25, 2013	April 25, 2043		4.4		500,000			500,000
	November 13, 2013	November 13, 2043		5.7		200,000			200,000
	December 12, 2014	December 12, 2044		5.2		160,000			160,000
	June 3, 2015	June 3, 2045		4.4		240,000			240,000
Securities in foreign currencies	May 2, 2007	May 2, 2037		6.2		930,900			—
	June 10, 2015	June 10, 2045		5.0		559,650			559,650
	September 27, 2016	—		4.5		553,450			553,450
	May 16, 2017	—		5.3		—			562,700
Issuance cost						(14,104	)		(12,912	)
Total						3,574,896			3,017,888

The hybrid securities mentioned above are either without a maturity date or its maturity can be extended indefinitely at the maturity date without change of terms. Further, if a resolution is passed not to pay dividends on common stock, interest payments on the hybrid securities may be skipped.

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Other Equity

12 Months Ended

Dec. 31, 2017

Disclosure Of Other Equity [Abstract]

Disclosure of other equity [Text block]

30. OTHER EQUITY

(1) Details of other equity are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Other comprehensive income:
Gain on valuation of AFS financial assets		386,981			301,930
Share of other comprehensive loss of joint ventures and associates		(1,863	)		(1,251	)
Loss on foreign currencies translation for foreign operations		(48,353	)		(242,700	)
Remeasurement of the net defined benefit liability		(163,397	)		(152,624	)
Gain on valuation of cash flow hedges		—			777
Equity related to current assets held for sale		—			4,145
Sub-total		173,368			(89,723	)
Treasury shares		(34,113	)		(34,113	)
Other capital adjustments		(1,607,280	)		(1,815,438	)
Total		(1,468,025	)		(1,939,274	)

(2) Changes in the accumulated other comprehensive income are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Beginning balance			Increase (decrease) on valuation			Reclassification(*)			Income tax effect			Ending balance
Gain (loss) on valuation of available-for-sale financial assets		300,994			190,842			(101,439	)		(15,712	)		374,685
Share of other comprehensive income (loss) of joint ventures and associates		2,779			4,409			—			(1,114	)		6,074
Gain (loss) on foreign currency translation of foreign operations		(107,721	)		49,421			—			(12,489	)		(70,789	)
Remeasurement of the net defined benefit liability		(119,375	)		(102,467	)		—			24,263			(197,579	)
Loss on valuation of cash flow hedges		(10,371	)		—			—			—			(10,371	)
Total		66,306			142,205			(101,439	)		(5,052	)		102,020

	For the year ended December 31, 2016
	Beginning balance			Increase (decrease) on valuation			Reclassification(*)			Income tax effect			Ending balance
Gain (loss) on valuation of available-for-sale financial assets		374,685			114,617			(101,647	)		(674	)		386,981
Share of other comprehensive income (loss) of joint ventures and associates		6,074			(9,274	)		—			1,337			(1,863	)
Gain (loss) on foreign currency translation of foreign operations		(70,789	)		30,368			—			(7,932	)		(48,353	)
Remeasurement of the net defined benefit liability		(197,579	)		45,096			—			(10,914	)		(163,397	)
Gain (loss) on valuation of cash flow hedges		(10,371	)		10,371			—			—			—
Total		102,020			191,178			(101,647	)		(18,183	)		173,368

	For the year ended December 31, 2017
	Beginning balance			Increase (decrease) on valuation			Reclassification(*)			Income tax effect			Ending balance
Gain (loss) on valuation of available-for-sale financial assets		386,981			80,997			(164,803	)		(1,245	)		301,930
Share of other comprehensive income (loss) of joint ventures and associates		(1,863	)		2,516			—			(1,904	)		(1,251	)
Loss on foreign currency translation of foreign operations		(48,353	)		(193,272	)		—			(1,075	)		(242,700	)
Remeasurement gain (loss) related to defined benefit plan		(163,397	)		6,216			—			4,557			(152,624	)
Gain (loss) on valuation of cash flow hedges		—			1,025			—			(248	)		777
Transfer to non-current assets held for sale		—			4,145			—			—			4,145
Total		173,368			(98,373	)		(164,803	)		85			(89,723	)

(*) For the change in gain (loss) on valuation of AFS financial assets, “reclassification” is disposal or recognition of impairment losses on AFS financial assets.

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Retained Earnings

12 Months Ended

Dec. 31, 2017

Retained Earnings Note Disclosure [Abstract]

Disclosure of retained earnings accumulated deficit [Text block]

31. RETAINED EARNINGS

(1) Details of retained earnings are as follows (Unit: Korean Won in millions):

		December 31, 2016		December 31, 2017
Legal reserve	Earned surplus reserve		1,622,754		1,729,754
	Other legal reserve		44,634		45,668
	Sub-total		1,667,388		1,775,422
Voluntary reserve	Business rationalisation reserve		8,000		8,000
	Reserve for financial structure improvement		235,400		235,400
	Additional reserve		7,073,104		7,418,806
	Regulatory reserve for credit loss		2,255,252		2,438,191
	Revaluation reserve		753,908		751,964
	Other voluntary reserve		11,700		11,700
	Sub-total		10,337,364		10,864,061
Retained earnings before appropriation			2,606,814		2,980,523
	Total		14,611,566		15,620,006

i. Legal reserve

In accordance with the Banking Act, legal reserve are appropriated at least one tenth of the earnings after tax on every dividend declaration, not exceeding the paid in capital. This reserve may not be used other than for offsetting a deficit or transferring to capital.

ii. Other legal reserve

Other legal reserves are appropriated in the branches located in Japan, Vietnam and Bangladesh according to the banking laws of Japan, Vietnam and Bangladesh, respectively, and may be used to offset any deficit incurred in those branches.

iii. Business rationalization reserve

Pursuant to the Restriction of Special Taxation Act, the Group was previously required to appropriate, as a reserve for business rationalization, amounts equal to tax reductions arising from tax exemptions and tax credits up to December 31, 2001. The requirement was no longer effective from 2002.

iv. Reserve for financial structure improvement

From 2002 to 2014, the Finance Supervisory Services recommended banks in Korea to appropriate at least ten percent of net income after accumulated deficit for financial structure improvement, until tangible common equity ratio equals 5.5 percent. But this reserve is not available for payment of cash dividends; however, it can be used to reduce a deficit or be transferred to capital. Since 2015, reservation and appropriation became an autonomous judgment matter of the Group.

v. Additional reserve and other voluntary reserve

Both of Additional reserve and other voluntary reserve are appropriated for capital adequacy and other management purpose.

vi. Regulatory reserve for credit loss

In accordance with Article 29 of the Regulation on Supervision of Banking Business (“RSBB”), if provisions for credit losses under IFRS for the accounting purpose are lower than provisions under RSBB, the Group discloses such shortfall amount as regulatory reserve for credit loss.

vii. Revaluation reserve

Revaluation reserve is the amount of limited dividends set by the board of directors to be the recognized as complementary capital when the gain or loss occurred in the property revaluation by adopting IFRS.

(2) Changes in retained earnings are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Beginning balance		14,165,358			13,726,122			14,611,566
Net income attributable to owners		1,059,157			1,261,266			1,512,148
Dividends on common stock		(504,952	)		(168,317	)		(336,636	)
Dividends on hybrid securities		(183,320	)		(206,515	)		(167,072	)
Appreciation of merger losses		(806,640	)		—			—
Repayment of hybrid securities		—			(990	)		—
Retirement of treasury stock		(3,481	)		—			—
Ending balance		13,726,122			14,611,566			15,620,006

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Regulatory Reserve for Credit Loss

12 Months Ended

Dec. 31, 2017

Disclosure Of Regulatory Capital Requirements Under Regulation On Supervision Of Banking Business [Abstract]

Disclosure of regulatory capital requirements under regulation on supervision of banking business [Text block]

32. REGULATORY RESERVE FOR CREDIT LOSS

In accordance with Paragraph 1 and 2 of Article 29 of the Regulation on Supervision of Banking Business (“RSBB”), if the estimated provisions for credit loss under IFRS for the accounting purpose are lower than those in accordance with the provisions under the RSBB, the Group shall disclose the difference as the planned regulatory reserve for credit loss.

(1) Balance of the planned regulatory reserve for credit loss is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2016		2017
Beginning balance		2,255,252		2,438,191
Planned provision of regulatory reserve for credit loss		182,939		140,266
Ending balance		2,438,191		2,578,457

(2) Planned reserves provided, adjusted net income after the planned reserves provided and adjusted earnings per share after the planned reserves provided are as follows (Unit: Korean Won in millions, except for earnings per share amount):

	For the years ended December 31
	2015		2016		2017
Net income		1,075,392		1,277,533		1,530,088
Provision of regulatory reserve for credit loss		499,110		182,939		140,266
Adjusted net income after the provision of regulatory reserve		576,282		1,094,594		1,389,822
Adjusted EPS after the provision of regulatory reserve (Unit: Korean Won)		584		1,320		1,817

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Dividends

12 Months Ended

Dec. 31, 2017

Dividends [Abstract]

Dividends

33. DIVIDENDS

The Group’s dividends for the year ended December 31, 2016 and 2017 are 400 Won and 500 Won per share, respectively, and the total dividend amount to 269,308 million Won and 336,636 million Won, respectively. The Group paid out 67,328 million Won (100 Won per share) as an interim dividend during the year ended December 31, 2017. Meanwhile, the dividend for 2017 was approved on 23 March 2018.

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Net Interest Income

12 Months Ended

Dec. 31, 2017

Interest Revenue (Expense), Net [Abstract]

Disclosure of interest income (expense)

34. NET INTEREST INCOME

(1) Interest income recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Financial assets at FVTPL		63,143		63,408		53,348
AFS financial assets		389,443		339,518		239,030
HTM financial assets		418,065		360,054		307,965
Loans and receivables:
Interest on due from banks		81,117		75,021		83,325
Interest on loans		7,700,475		7,635,791		7,835,957
Interest of other receivables		45,992		38,520		31,062
Sub-total		7,827,584		7,749,332		7,950,344
Total		8,698,235		8,512,312		8,550,687

(2) Interest expense recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Interest on deposits due to customers		2,888,529		2,547,142		2,380,263
Interest on borrowings		216,743		215,240		238,212
Interest on debentures		707,772		619,255		638,653
Interest expense on others		123,291		111,131		72,909
Total		3,936,335		3,492,768		3,330,037

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Net Fees and Commissions Income

12 Months Ended

Dec. 31, 2017

Fee and commission income (expense) [Abstract]

Net Fees And Commissions Income

35. NET FEES AND COMMISSIONS INCOME

(1) Fees and commissions income recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Banking fees(*)		676,114		660,556		673,582
Guarantee fees		78,922		66,549		65,779
Fees from project financing		15,521		20,213		13,394
Credit card fees		852,250		954,502		1,072,423
Brokerage fees		67,692		70,928		80,872
Others		66,841		92,722		163,148
Total		1,757,340		1,865,470		2,069,198

(*) Banking fees include agency commission, fees income from electronic finance, fees income related to loan, fees for import letter of credit dealing, commission received on foreign exchange and others.

(2) Fees and commissions expense incurred is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Fees paid		133,909		162,170		164,834
Credit card commissions		643,524		760,913		828,363
Brokerage commissions		615		739		558
Others		2,496		4,517		4,977
Total		780,544		928,339		998,732

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Dividend Income

12 Months Ended

Dec. 31, 2017

Disclosure Of Revenue From Dividends [Abstract]

Disclosure of revenue from dividends [Text block]

36. DIVIDEND INCOME

Dividend income recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Dividend from financial assets at FVTPL		1,217		996		446
Dividend from AFS financial assets		101,706		183,514		124,546
Total		102,923		184,510		124,992

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Gains (Losses) on Financial Assets at Fair Value Through Profit or Loss

12 Months Ended

Dec. 31, 2017

Disclosure Of Gains Losses On Financial Instruments At Fair Value Through Profit Or Loss [Abstract]

Disclosure of gains losses on financial instruments at fair value through profit or loss [Text block]

37. GAINS (LOSSES) ON FINANCIAL ASSETS AT FVTPL

(1) Details of gains or losses related to financial assets at FVTPL are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016			2017
Gains on financial assets held for trading		171,137		185,786			6,123
Gains (losses) of financial assets designated at FVTPL		69,205		(71,399	)		(110,950	)
Total		240,342		114,387			(104,827	)

(2) Gains (losses) on financial assets held for trading are as follows (Unit: Korean Won in millions):

			For the years ended December 31
			2015			2016			2017
Financial Assets at FVTPL	Securities	Gain on valuation		7,735			9,323			2,764
		Gain on disposals		32,780			24,509			20,528
		Loss on valuation		(13,663	)		(12,681	)		(13,757	)
		Loss on disposals		(22,771	)		(11,524	)		(6,466	)
		Sub-total		4,081			9,627			3,069
	Other financial assets	Gain on valuation		10,195			13,628			6,524
		Gain on disposals		442			2,404			2,353
		Loss on valuation		(10,189	)		(14,033	)		(7,885	)
		Loss on disposals		(208	)		(1,644	)		(619	)
		Sub-total		240			355			373
	Total			4,321			9,982			3,442
Derivatives (for trading)	Interest rates derivatives	Gain on transactions and valuation		1,240,353			1,423,606			1,088,192
		Loss on transactions and valuation		(1,251,673	)		(1,401,582	)		(1,043,312	)
		Sub-total		(11,320	)		22,024			44,880
	Currencies derivatives	Gain on transactions and valuation		4,241,317			5,804,420			7,253,426
		Loss on transactions and valuation		(3,987,856	)		(5,683,357	)		(7,408,741	)
		Sub-total		253,461			121,063			(155,315	)
	Equity derivatives	Gain on transactions and valuation		92,400			293,657			511,220
		Loss on transactions and valuation		(166,528	)		(259,280	)		(397,462	)
		Sub-total		(74,128	)		34,377			113,758
	Other derivatives	Gain on transactions and valuation		54,322			50,139			4,056
		Loss on transactions and valuation		(55,519	)		(51,799	)		(4,698	)
		Sub-total		(1,197	)		(1,660	)		(642	)
	Total			166,816			175,804			2,681
	Total			171,137			185,786			6,123

(3) Gains (losses) on financial assets designated at FVTPL are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Gain (loss) on equity-linked securities:
Gain (loss) on disposals of equity-linked securities		(22,363	)		(24,165	)		(79,965	)
Gain (loss) on valuation of equity-linked securities		89,863			(52,007	)		(32,511	)
Sub-total		67,500			(76,172	)		(112,476	)
Gain (loss) on securities:
Gain (loss) on disposals of securities		(62	)		14			—
Gain on valuation of securities		1,027			882			290
Sub-total		965			896			290
Gain on other financial instruments:
Gain on valuation of other financial instruments		740			3,877			1,236
Total		69,205			(71,399	)		(110,950	)

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Net Loss on Available For Sale Financial Assets

12 Months Ended

Dec. 31, 2017

Disclosure Of Gains Losses On Available-for-sale Securities [Abstract]

Disclosure of gains losses on available-for-sale financial assets [Text block]

38. NET LOSSES ON AFS FINANCIAL ASSETS

Gains (losses) on AFS financial are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Gains on redemption of securities		1,089			721			47
Gains on transaction of securities		130,457			47,985			223,961
Impairment losses on securities		(134,827	)		(49,741	)		(31,300	)
Total		(3,281	)		(1,035	)		192,708

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Impairment Losses Due to Credit Loss

12 Months Ended

Dec. 31, 2017

Disclosure of impairment loss and reversal of impairment loss [Abstract]

Impairment Losses Due To Credit Loss

39. IMPAIRMENT LOSSES DUE TO CREDIT LOSS

Impairment losses on loans and receivables, guarantees and loan commitment recognized for credit loss are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Provision due to credit loss		(1,112,139	)		(890,763	)		(862,273	)
Reversal of provision on/(provision for) guarantees		140,318			59,780			55,424
Reversal of provision on/(provision for) loan commitment		5,175			(3,093	)		21,716
Total		(966,646	)		(834,076	)		(785,133	)

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General, Administrative, and Other Net Operating Incomes (Expenses)

12 Months Ended

Dec. 31, 2017

Disclosure Of General And Administrative Expense And Other Net Operating Income Expense [Abstract]

Disclosure of general and administrative expense and other net operating income expense [Text block]

40. GENERAL, ADMINISTRATIVE, AND OTHER NET OPERATING INCOMES (EXPENSES)

(1) Administrative expenses recognized are as follows (Unit: Korean Won in millions):

			For the years ended December 31
			2015		2016		2017
Employee benefits	Short term	Salaries		1,262,786		1,323,007		1,317,826
	employee benefits	Others		381,283		466,585		559,562
	Retirement benefit service costs(*)			135,754		156,356		146,848
	Termination			73,119		179,286		299,562
	Sub-total			1,852,942		2,125,234		2,323,798
Depreciation and amortization				236,958		248,269		183,601
Other general and administrative expenses	Rent			295,871		311,992		313,080
	Taxes and dues			103,580		102,531		111,248
	Service charges			233,860		244,543		198,828
	IT expenses			100,026		83,978		70,936
	Telephone and communication expenses			60,880		63,699		65,015
	Operating promotion expenses			46,638		48,115		43,850
	Advertising			58,914		76,153		68,942
	Printing			10,249		9,502		8,633
	Traveling expenses			9,601		11,681		13,064
	Supplies			6,822		6,827		6,795
	Insurance premium			7,236		8,092		8,548
	Reimbursement			23,779		26,846		27,516
	Maintenance			14,565		16,470		16,081
	Water, light and heating			15,205		15,006		14,165
	Vehicle maintenance			10,400		9,987		9,902
	Others			62,861		69,551		46,799
	Sub-total			1,060,487		1,104,973		1,023,402
	Total			3,150,387		3,478,476		3,530,801

(*) This includes the amount the Group paid for the Defined Contribution type pension plan of 3,946 million Won in addition to the expenses related to the Defined Benefit type pension plan of 142,902 million Won for the year ended December 31, 2017. For the details, please see Note 24 (7).

(2) Other operating incomes recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Gains on transaction of foreign exchange		3,352,318		4,791,772		3,391,095
Gains on disposal of loans and receivables		186,939		204,239		205,490
Gains on transactions of derivatives		59,003		130		122
Gains on fair value hedged items		25,235		99,302		53,532
Others(*)		158,806		112,079		86,159
Total		3,782,301		5,207,522		3,736,398

(*) Others include such incomes amounting to 137,187 million Won, 74,700 million Won and 29,336 million Won for the year ended December, 2015, 2016 and 2017, respectively, that the Group recognized for it is to receive from other creditor financial institutions in accordance with the creditor financial institutions committee agreement.

(3) Other operating expenses recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Losses on transaction of foreign exchange		3,429,638		4,706,055		2,886,535
KDIC deposit insurance fees		266,031		298,804		304,055
Contribution to miscellaneous funds		343,703		295,601		286,000
Losses on disposal of loans and receivables		43,266		4,265		9,221
Losses related to derivatives		20,982		98,981		109,569
Losses on fair value hedged items		56,532		475		—
Others(*)		232,210		171,120		172,331
Total		4,392,362		5,575,301		3,767,711

(*) Others include such expenses amounting to 154,897 million Won, 109,063 million Won and 5,237 million Won for the year ended December 31, 2015, 2016 and 2017, respectively, that the Group recognized for it is to carry out a payment to other creditor financial institutions in accordance with the creditor financial institutions committee agreement. In addition, other expense for the year ended December 31, 2017 includes 48,292 million Won of intangible asset amortization expense.

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Other Net Non Operating Income

12 Months Ended

Dec. 31, 2017

Other Nonoperating Income (Expense) [Abstract]

Other Net Non Operating Income

41. OTHER NET NON-OPERATING INCOME

(1) Details of gain or loss on valuation of investments in joint ventures and associates are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Gain on valuation		41,363			36,757			83,506
Loss on valuation		(55,176	)		(55,091	)		(70,117	)
Impairment loss		(56,311	)		(1,173	)		(114,903	)
Total		(70,124	)		(19,507	)		(101,514	)

(2) Other non-operating income and expense recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Other non-operating income		272,610			132,272			84,361
Other non-operating expense		(102,126	)		(133,582	)		(190,083	)
Total		170,484			(1,310	)		(105,722	)

(3) Other non-operating incomes recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Rental fee income		8,225		7,291		6,973
Gains on disposal of investment in joint ventures and associates		61,653		23,457		39,932
Gains on disposal of premises and equipment and other assets		6,814		1,885		5,028
Reversal of impairment loss on premises and equipment and other assets		539		3,581		666
Others(*)		195,379		96,058		31,762
Total		272,610		132,272		84,361

(*) Others include the receipt of guaranteed payment, which was amounting to 132,784 million Won, during the year ended December 31, 2015 that the Group received in accordance with the final irrevocable verdict for the payment of commitment (Note 44).

(4) Other non-operating expenses recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Depreciation on investment properties		3,806		3,762		3,902
Interest expenses of rent leasehold deposits		688		496		459
Losses on disposal of investment in joint ventures and associates		10		15,060		38,713
Losses on disposal of premises and equipment and other assets		2,707		9,718		9,994
Impairment losses on premises and equipment and other assets		2,990		1,936		390
Donation		46,266		43,939		98,132
Others		45,659		58,671		38,493
Total		102,126		133,582		190,083

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Income Tax Expense

12 Months Ended

Dec. 31, 2017

Major components of tax expense (income) [Abstract]

Income Tax Expense

42. INCOME TAX EXPENSE

(1) Income tax expenses are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Current tax expense
Current tax expense in respect of the current year		362,552			332,996			471,669
Adjustments recognized in the current period in relation to the current tax of prior periods		(27,038	)		(22,138	)		(5,209	)
Sub-total		335,514			310,858			466,460
Deferred tax expense
Deferred tax expense (benefit) relating to the origination and reversal of temporary differences		44,884			(18,766	)		(47,464	)
Less: Deferred tax charged directly to other comprehensive income		(3,844	)		(16,236	)		422
Sub-total		41,040			(35,002	)		(47,042	)
Income tax expense		376,554			275,856			419,418

(2) Income tax expense (benefit) can be reconciled to net income (loss) before income tax expense as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Net income before income tax expense		1,451,946			1,553,389			1,949,506
Income from continuing operations before income tax		1,451,946			1,553,389			1,949,506
Tax calculated at statutory tax rate(*)		350,909			375,458			471,318
Adjustments
Effect of income that is exempt from taxation		(56,247	)		(75,166	)		(55,983	)
Effect of expense that is not deductible in determining taxable profit		50,152			13,664			22,254
Adjustments recognized in the current period in relation to the current tax of prior periods		(27,038	)		(22,138	)		(5,209	)
Effect on deferred tax balances due to the change in income tax rate from 24.2% to 27.5% (effective January 1, 2018)		—			—			(35,987	)
Others		58,778			(15,962	)		23,025
Sub-total		25,645			(99,602	)		(51,900	)
Income tax expense		376,554			275,856			419,418
Effective tax rate
		25.93	%		17.76	%		21.51	%

(*) Applicable income tax rate; 1) 11% for below 200 million Won, 2) 22% for from 200 million Won to 20 billion Won, 3) 24.2% for above 20 billion Won.

(3) Deferred tax assets and liabilities are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Beginning balance (*1)			Recognized as income (loss)			Recognized as other comprehensive income (loss)			Ending balance
Gain (loss) on financial assets at FVTPL		422,910			22,819			—			445,729
Gain (loss) on available-for-sale financial assets		(105,556	)		94			(16,074	)		(121,536	)
Gain (loss) on valuation using the equity method of accounting		21,156			(14,936	)		(1,114	)		5,106
Gain (loss) on valuation of derivatives		(48,438	)		8,664			—			(39,774	)
Accrued income		(75,094	)		(7,054	)		—			(82,148	)
Allowance for loan loss		(59,428	)		8,924			—			(50,504	)
Loan and receivables written off		6,921			47,304			—			54,225
Loan origination costs and fees		(88,476	)		(15,436	)		—			(103,912	)
Defined benefit liability		151,666			26,912			24,845			203,423
Deposits with employee retirement insurance trust		(135,474	)		(51,570	)		—			(187,044	)
Provision for guarantee		84,530			(15,305	)		—			69,225
Other provision		37,029			(9,131	)		—			27,898
Others		24,355			(42,324	)		(11,501	)		(29,470	)
Net deferred tax assets		236,101			(41,039	)		(3,844	)		191,218

	For the year ended December 31, 2016
	Beginning balance			Recognized as income (loss)			Recognized as other comprehensive income (loss)			Ending balance
Gain on financial assets at FVTPL		445,729			(18,524	)		—			427,205
Gain (loss) on AFS financial assets		(121,536	)		57			(666	)		(122,145	)
Gain (loss) on valuation using the equity method of accounting		5,106			26,500			1,337			32,943
Gain (loss) on valuation of derivatives		(39,774	)		(4,079	)		—			(43,853	)
Accrued income		(82,148	)		12,188			—			(69,960	)
Provision for loan losses		(50,504	)		3,693			—			(46,811	)
Loan and receivables written off		54,225			(310	)		—			53,915
Loan origination costs and fees		(103,912	)		(4,190	)		—			(108,102	)
Defined benefit liability		203,423			32,536			(10,914	)		225,045
Deposits with employee retirement insurance trust		(187,044	)		(39,277	)		—			(226,321	)
Provision for guarantee		69,225			(28,087	)		—			41,138
Other provision		27,898			4,494			—			32,392
Others		(29,470	)		50,001			(5,993	)		14,538
Net deferred tax assets		191,218			35,002			(16,236	)		209,984

(*1) The beginning balance incorporates the deferred tax assets (liabilities) from subsidiaries that were reclassified into disposal group held for sale and disposal groups held for distribution to owners.

	For the year ended December 31, 2017
	Beginning balance			Recognized as income (expense)			Recognized as other comprehensive income (expense)			Ending balance
Gain on financial assets at FVTPL		427,205			70,996			—			498,201
Gain (loss) on AFS financial assets		(122,145	)		1,011			(1,008	)		(122,142	)
Gain (loss) on valuation using the equity method of accounting		32,943			(6,473	)		(1,904	)		24,566
Gain (loss) on valuation of derivatives		(43,853	)		33,806			(248	)		(10,295	)
Accrued income		(69,960	)		8,972			—			(60,988	)
Provision for loan losses		(46,811	)		(886	)		—			(47,697	)
Loan and receivables written off		53,915			(44,138	)		—			9,777
Loan origination costs and fees		(108,102	)		(29,218	)		—			(137,320	)
Defined benefit liability		225,045			54,533			4,656			284,234
Deposits with employee retirement insurance trust		(226,321	)		(61,012	)		—			(287,333	)
Provision for guarantee		41,138			(10,536	)		—			30,602
Other provision		32,392			12,761			—			45,153
Others(*2)		14,538			17,227			(1,074	)		30,691
Net deferred tax assets		209,984			47,043			422			257,449

(*2) Among the deferred tax assets and liabilities classified as ‘Others,’ the deferred tax asset arising from accumulated deficit amounts to 15,652 million Won.

(4) Unrecognised temporary differences are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Deductible temporary differences(*)		59,803			126,818
Unused tax losses		192,138			96,135
Taxable temporary differences(*)		(1,263,200	)		(1,298,586	)
Total		(1,011,259	)		(1,075,633	)

(*) The amounts in the tabular disclosure at 31 December 2016 have been restated by (164,649) million Won relating to Deductible temporary differences and (394,659) million Won relating to Taxable temporary differences, respectively, due to an error in the previous year’s disclosure.

(5) Deferred tax charged directly to other comprehensive income is as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Loss on available-for-sale financial assets		(113,161	)		(114,169	)
Share of other comprehensive gain (loss) of jointly controlled entities and associates		950			(954	)
Gain on foreign currency translation of foreign operations		16,930			15,855
Remeasurements		51,661			56,317
Loss on valuation of cash flow hedges		—			(248	)
Total		(43,620	)		(43,199	)

(6) Current tax assets and liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Current tax assets		6,229		4,722
Current tax liabilities		171,192		232,600

(7) Deferred tax assets and liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Deferred tax assets		232,007		280,130
Deferred tax liabilities		22,023		22,681
Net deferred tax assets		209,984		257,449

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Earnings per Share (EPS)

12 Months Ended

Dec. 31, 2017

Earnings per share [Abstract]

Earnings Per Share (Eps)

43. EARNINGS PER SHARE (“EPS”)

Basic EPS is calculated by dividing net income by weighted average number of common shares outstanding (Unit: Korean Won in millions except for EPS and number of shares):

	For the years ended December 31
	2015			2016			2017
Net income attributable to common shareholders		1,059,157			1,261,266			1,512,148
Dividends to hybrid securities		(183,320	)		(206,515	)		(167,072	)
Net income attributable to common shareholders		875,837			1,054,751			1,345,076
Weighted average number of common shares outstanding		673 million shares			673 million shares			673 million shares
Basic Earnings Per Share		1,301			1,567			1,999

Diluted EPS is equal to basic EPS because there is no dilution effect for the year ended December 31, 2015, 2016 and 2017.

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Contingent Liabilities and Commitments

12 Months Ended

Dec. 31, 2017

Disclosure of contingent liabilities [Abstract]

Contingent Liabilities And Commitments

44. CONTINGENT LIABILITIES AND COMMITMENTS

(1) Details of guarantees are as follow (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Confirmed guarantees
Guarantee for loans		79,566		157,299
Acceptances		504,354		320,519
Letters of guarantees		97,606		108,238
Other confirmed guarantees		7,588,661		6,288,965
Total		8,270,187		6,875,021
Unconfirmed guarantees
Local letter of credit		397,588		383,117
Letter of credit		3,844,345		3,637,787
Other unconfirmed guarantees		859,768		505,689
Total		5,101,701		4,526,593
CP purchase commitments and others		1,389,896		1,458,101

(2) Details of loan commitments and others are as follow (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Loan commitments		83,795,496		80,760,325
Other commitments		4,840,593		4,546,090

(3) Litigation case

The Group had filed lawsuits as follows (Unit: Korean Won in millions except for number of cases):

	December 31, 2016				December 31, 2017
	As plaintiff		As defendant		As plaintiff		As defendant
Number of cases		88 cases		175 cases		83 cases		155 cases
Amount of litigation		308,848		246,465		413,267		244,767
Allowance for litigations				5,946				9,277

(4) Other

The Group provides clearance services for payments in Korean Won in order to facilitate trade transactions between Korea and Iran. In connection with these services, the Group is currently being investigated by US government agencies including US prosecutors(United States Attorney’s Office and New York State Attorney General’s Office) as to whether the Group has violated United States laws by participating in prohibited transactions involving countries sanctioned by the US.

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Related Party Transactions

12 Months Ended

Dec. 31, 2017

Disclosure of transactions between related parties [Abstract]

Related Party Transactions

45. RELATED PARTY TRANSACTIONS

Related parties of the Group and assets and liabilities recognized and major transactions with the related parties during the current and prior periods are as follows:

(1) Related parties

Related parties
Associates	Kumho Tires Co., Inc., Woori Service Networks Co., Ltd., Korea Credit Bureau Co., Ltd., Korea Finance Security Co., Ltd., Chin Hung International Inc., Poonglim Industrial Co., Ltd., STX Engine Co., Ltd, STX Corporation, 2016KIF-IMM Woori Bank Technology Venture Fund, K BANK Co., Ltd., Well to Sea No. 3 Private Equity Fund, and Others (Dongwoo C & C Co., Ltd. and other 22 associates)

(2) Assets and liabilities from transactions with related parties are as follows (Unit: Korean Won in millions):

Related party		A title of account	December 31, 2016			December 31, 2017
Corporation that have significant influence over the Group	KDIC(*1)	Loans		9			—
		Other assets		270,041			—
		Deposits due to customers		1,894,631			—
		Other liabilities		15,568			—
Associates	Kumho Tires Co., Inc.	Loans		299,523			170,917
		Allowance for credit loss		(715	)		(156,712	)
		Deposits due to customers		45,957			666
		Other liabilities		50			50
	Woori Blackstone Korea Opportunity Private Equity Fund No.1	Other assets		34			—
		Other liabilities		306			—
	Woori Service Networks Co., Ltd.	Loans		29			45
		Deposits due to customers		2,572			1,311
		Other liabilities		393			357
	Korea Credit Bureau Co., Ltd.	Loans		2			6
		Deposits due to customers		5,069			5,586
		Other liabilities		40			54
	Korea Finance Security Co., Ltd.	Loans		55			56
		Deposits due to customers		2,801			2,854
		Other liabilities		6			7
	Chin Hung International Inc.	Loans		4,320			408
		Allowance for credit loss		(4,287	)		(22	)
		Deposits due to customers		14,047			46,220
		Other liabilities		279			1,658
	Poonglim Industrial Co., Ltd.	Deposits due to customers		283			4
	STX Engine Co., Ltd.	Loans		107,974			106,176
		Allowance for credit loss		(89,531	)		(88,734	)
		Deposits due to customers		13,260			18,092
		Other liabilities		588			29
	Samho International Co., Ltd.(*2)	Loans		37,327			—
		Allowance for credit loss		(717	)		—
		Deposits due to customers		82,917			—
		Other liabilities		216			—
	STX Corporation	Loans		144,035			47,711
		Allowance for credit loss		(92,643	)		(31,210	)
		Deposits due to customers		14,412			77,555
		Other liabilities		90			80
	K BANK Co., Ltd.	Loans		—			212
		Other assets		325			—
	Well to Sea No.3 Private Equity Fund(*3)	Loans		—			73,810
		Allowance for credit loss		—			(39	)
		Deposits due to customers		—			61
		Other liabilities		—			27
	Others(*4)	Loans		619			499
		Allowance for credit loss		(253	)		(471	)
		Other assets		8			1
		Deposits due to customers		4,460			2,906
		Other liabilities		60			73

(*1) As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been excluded from the corporation that have significant influence over the Group.

(*2) As the Group sold its entire ownership interest of the entity, it is excluded from the investment in associates during the years ended December 31, 2017.

(*3) Due to capital contribution by the Group during the years ended December 31, 2017, the entity was included in the investment in associates.

(*4) Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2016 and 2017.

(3) Gain or loss from transactions with related parties are as follows (Unit: Korean Won in millions):

			For the years ended December 31
Related party		A title of account	2015			2016			2017
Corporation that have significant influence over the group	KDIC(*3)	Interest income		22,237			11,778			—
		Interest expenses		23,584			20,966			15,331
		Impairment losses due to credit loss (reversal of allowance for credit loss)		29			—			—
Associates	Kumho Tires Co., Ltd.	Interest income		2,698			2,430			2,641
		Fees income		6			6			5
		Interest expenses		205			68			1
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(2,353	)		162			155,997
	Woori Blackstone Korea Opportunity Private Equity Fund No.1	Fees income		1,437			1,364			6,225
	Woori Service Networks Co., Ltd.	Other income		28			29			30
		Interest expenses		83			49			24
		Fees expenses		821			985			543
		Other expenses		228			222			507
		Impairment losses due to credit loss		2			—			—
	Korea Credit Bureau Co., Ltd.	Interest expenses		74			138			82
		Fees expenses		1,690			1,915			2,079
	Korea Finance Security Co., Ltd.	Interest expenses		39			10			12
		Fees expenses		93			110			—
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(3	)		—			—
	Chin Hung International Inc.	Interest income		807			240			364
		Fees income		1			1			1
		Interest expenses		35			28			27
		Reversal of allowance for credit loss		(534	)		(481	)		(4,265	)
	Poonglim Industrial Co., Ltd.	Interest expenses		11			2			—
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(1,565	)		(1,557	)		—
	Ansang Tech Co., Ltd.(*1)	Reversal of allowance for credit loss		(38	)		—			—
	STX Engine Co., Ltd.	Interest income		1,358			1,348			1,417
		Fees income		67			58			28
		Interest expenses		46			97			147
		Impairment losses due to credit loss		20,524			63,866			(797	)
Associates	Samho International Co., Ltd.(*4)	Interest income		1,015			916			486
		Fees income		3			5			5
		Interest expenses		981			525			334
		Reversal of allowance for credit loss		(2,098	)		(5,166	)		(717	)
	Force TEC C Co., Ltd.(*5)	Interest income		249			153			—
		Impairment losses due to credit loss (reversal of allowance for credit loss)		5,900			—			—
	Hana Engineering & Construction Co., Ltd.(*2)	Reversal of allowance for credit loss		(98	)		—			—
	STX Corporation	Interest income		1,729			1,039			219
		Fees income		89			75			30
		Interest expenses		6			7			4
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(4,060	)		73,457			(61,432	)
	Osung LST Co., Ltd.(*2)	Interest income		226			170			—
		Interest expenses		16			1			—
		Reversal of allowance for credit loss		(223	)		(338	)		—
	Woori Columbus 1st Private Equity Fund	Fees income		546			308			272
	Ilyang Construction Co., Ltd.(*2)	Impairment losses due to credit loss		215			—			—
	K BANK Co., Ltd.(*6)	Fees income		—			296			—
		Other income		—			1,638			1,051
	Well to Sea No.3	Interest incomes		—			—			982
	Private Equity Fund(*7)	Interest expenses		—			—			4
		Impairment losses due to credit loss		—			—			39
	Others(*8)	Interest expenses		—			17			13
		Impairment losses due to credit loss		—			253			218

(*1) As the Group sold its ownership interests in the entities during the year ended December 31, 2015, these entities were excluded from the investment in associates.

(*2) As the Group sold its ownership interests in the entities during the year ended December 31, 2016, these entities were excluded from the investment in associates.

(*3) As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been exclude from the corporation that have significant influence over the Group.

(*4) As the Group sold its entire ownership interest of the entity, it is excluded from the investment in associates during the years ended December 31, 2017.

(*5) The entity is not in scope for the associates as of December 31, 2017, because the Group does not have significant influence over the entity due to the fact that it is going through workout process under receivership.

(*6) Due to capital contribution during the year ended December 31, 2016, the entity has been included in the investment in associates.

(*7) Due to capital contribution by the Group during the year ended December 31, 2017, the entity was included in the investment in associates.

(*8) Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2017, and Saman Corporation, Kyesan Engineering Co., Ltd., Gachi Staff Co., Ltd., QTS Shipping Co., Ltd., and others were included as of December 31, 2016, respectively.

(4) Guarantees provided to the related parties are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
KDIC(*1)		1,500,000		—	Loan commitment
Kumho Tires Co., Inc.		24,187		4,181	Letter of credit and others
		126,435		636	Loan commitment
Korea Finance Security Co., Ltd.		205		204	Loan commitment
Korea Credit Bureau Co., Ltd.		33		29	Loan commitment
Woori Service Networks Co., Ltd.		171		155	Loan commitment
Chin Hung International Inc.		40,904		31,891	Loan commitment
STX Engine Co., Ltd.		63,103		68,858	Letter of credit and others
		685		—	Loan commitment
SamHo Co., Ltd.(*2)		30,083		—	Loan commitment
STX corporation		24,316		17,557	Letter of credit and others
		71		53	Loan commitment
Well to Sea No.3 Private Equity Fund(*3)		—		236,190	Loan commitment

(*1) As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been exclude from the corporation that have significant influence over the Group.

(*2) As the Group sold its entire ownership interest of the entities during the year ended December 31, 2017, they are excluded from the investment in associates.

(*3) Due to capital contribution by the Group during the year ended December 31, 2017, the entity was included in the investment in associates.

For the guarantee provided to the related parties, the Group recognized provisions for guarantees amounting to 70,587 million Won and 71,459 million Won, as of December 31, 2016 and 2017, respectively.

(5) Compensation for key management is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015(*)		2016		2017
Short term benefits		10,288		9,523		12,024
Severance payments		473		424		472
Total		10,761		9,947		12,496

(*) As the scope of the compensation for key management disclosure has changed, the comparative amounts are restated.

Key management includes registered executives and non-registered executives. Outstanding assets and liabilities from transactions with key management amount to 2,439 million Won and 6,309 million Won, respectively, as of December 31, 2017. With respect to the assets, the Group has not recognized any allowance, nor provision.

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Business Combination

12 Months Ended

Dec. 31, 2017

Disclosure of detailed information about business combination [Abstract]

Business Combination

46. BUSINESS COMBINATION

(1) Acquisition of Woori Wealth Bank in Philippines in 2016

The Group acquired 51% interest ownership in Wealth Development Bank, a savings bank in Philippines, in October 2016. As the residual shares of 49% is owned by Viscal group, which operates retail businesses, the Group plans to expand its business operation through retail channels of Viscal group.

(2) Establishment of Woori Bank Vietnam Limited in 2016

The Group established Woori Bank Vietnam (capitalized at 3 trillion VND) in October 2016, upon the approval from Vietnam Central Bank and commenced its operation on January 3, 2017. The Group has been operating two branches in Hanoi and Ho Chi Minh, and newly established the subsidiary in order for further expansion of its retail banking business in Vietnam.

(3) Acquisition accounting in 2016 (Unit: Korean Won in millions)

	Woori Wealth Bank in Philippines		Woori Bank Vietnam Limited		Total
I. Consideration
Cash and cash equivalents		25,675		155,400		181,075
II. Identifiable assets and liabilities
Cash and Cash equivalents		48,774		—		48,774
AFS financial assets		2,125		—		2,125
Loan and receivables		126,917		155,400		282,317
Property and equipment		651		—		651
Intangible assets		205		—		205
Other assets		8,792		—		8,792
Sub-total		187,464		155,400		342,864
Deposits		148,521		—		148,521
Allowance for credit losses		352		—		352
Other liabilities		3,655		—		3,655
Sub-total		152,528		—		152,528
Fair value of identifiable net asset		34,936		155,400		190,336
III. Non-controlling interest		17,118		—		17,118
IV. Goodwill		7,857		—		7,857

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Subsequent Event

12 Months Ended

Dec. 31, 2017

Disclosure of non-adjusting events after reporting period [Abstract]

Subsequent Event

47. SUBSEQUENT EVENTS

There have been no significant events between December 31, 2017 and the date of issuance of these consolidated financial statements which would require a change to or additional disclosure in the accounts.

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Significant Basis of Preparation and Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2017

Accounting policies [Abstract]

Basis of presentation

(1) Basis of presentation

The Group’s consolidated financial statements are prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).

The Group operates primarily in Korea and its official accounting records are maintained in Korean Won. The United States dollar (“U.S. dollar” or “US$” or “USD”) amounts are provided herein as supplementary information solely for the convenience of readers outside Korea. Korean Won amounts are expressed in U.S. Dollars at the rate of 1,067.42 Korean Won to US$1.00, the noon buying exchange rate in effect on December 31, 2017, as quoted by the Federal Reserve Bank of New York in the United States. Such convenience translation into U.S. Dollars should not be construed as representations that Korean Won amounts have been, could have been, or could in the future be, converted at this or any other rate of exchange.

The significant accounting policies that have been applied for the preparation of the consolidated financial statements for the year ended December 31, 2017 are described below. There have not been changes to the significant accounting policies except for the impacts from the adoptions of accounting standards or interpretations which are explained below.

The Group’s consolidated financial statements have been prepared based on the historical cost method except for specific non-current assets and certain financial assets or liabilities reported at fair value. Historical cost is generally based on the fair value of the consideration given in exchange for goods and services.

The consolidated financial statements of the Group were approved by the board of directors on March 2, 2018.

1) The Group has newly adopted the following new standards and interpretations that affected the Group’s accounting policies.

Amendments to IAS 7—Statement of Cash Flows

The amendments require an entity to provide disclosures that enable users of financial statements to evaluate changes in liabilities arising from financing activities, including both cash and non-cash changes. Additional disclosure required related to the first time application of these amendments in the current year are in note 6. Consistent with the transition provisions of the amendments, the Group has not disclosed comparative information for the prior period. Apart from the additional disclosure in note 6, the application of these amendments has no material impact on the disclosures or the amounts recognized in the Group’s consolidated financial statements.

Amendments to IAS 12—Income Taxes

The amendments clarify that in evaluating the deferred tax assets arising from deductible temporary difference of debt instruments measured at fair value, the carrying amount of an asset does not limit the estimation of probable future taxable profits. The application of these amendments has no material impact on the disclosures or the amounts recognized in the Group’s consolidated financial statements.

Other than the amendment stated above, there are several annual improvements in the current period, but the application of the amendments has had no material effect on the Group’s consolidated financial statements.

2) The Group has not applied the following IFRSs that have been issued but are not yet effective:

Enactments to IFRS 9—Financial Instruments

IFRS 9 issued in November 2009 introduced new requirements for the classification and measurement of financial assets. IFRS 9 was subsequently amended in October 2010 to include requirements for the classification and measurement of financial liabilities and for derecognition, and in November 2013 to include the new requirements for general hedge accounting. Another revised version of IFRS 9 was issued in July 2014 mainly to include a) impairment requirements for financial assets and b) limited amendments to the classification and measurement requirements by introducing a ‘fair value through other comprehensive income’(FVTOCI) measurement category for certain simple debt instruments. This standards supersedes IAS 39—Financial Instruments: Recognition and Measurement, and will be applied for annual periods beginning on or after January 1, 2018.

In principle, IFRS 9 must be applied retrospectively. However, there are certain exemptions to the application of retroactive approach such as presenting comparative information on classification, measurement and impairment of financial instruments. In addition, IFRS 9 is applied prospectively for hedge accounting with exceptions such as accounting for the time value of options. The Group will apply the standard retrospectively, in accordance with IAS 8 “Accounting Policies, Changes in Accounting Estimates and Errors”, but will not restate previous periods provided that it is not possible to do so without the use of hindsight. Because of this, the Group will recognise any difference between the previous carrying amount and the carrying amount at the beginning of the annual reporting period that includes the date of initial application of IFRS 9 (January 1, 2018) in the opening retained earnings as of January 1, 2018.

The Group has completed the design and implementation of the internal controls and/or financial reporting processes related to the presentation of financial instruments in order to adopt IFRS 9. The Group has completed a financial impact analysis on the 2017 financial statements based on available information as of year-end in order to determine the impact of adopting IFRS 9 for the first time. The expected financial impact of each key issue on the financial statement, is as follows.

a) Classification and Measurement of Financial Instruments

When IFRS 9 is adopted, all recognized financial assets that in scope are subsequently measured at either amortized cost, fair value through other comprehensive income (FVTOCI), or fair value through profit or loss (FVTPL) as shown below, based on the business model for managing financial assets and based on the nature of contractual cash flows arising from the financial assets. Also, when hybrid contracts contain financial asset as its host contract, the embedded derivative will not be bifurcated as the whole hybrid contract would be classified as a financial asset.

	Business Model
Nature of the contractual cash flow	Collection of the contractual cashflow	Collection of the contractual cashflow and sale of asset	Sale of asset, others
Principal and Interest only	Amortized Cost(*1)	FVTOCI(*1)	FVTPL
Other than the above		FVTPL(*2)

(*1) An irrevocable election is available to designate a financial asset to be classified as FVTPL, for the purpose of eliminating or reducing accounting discrepancies.

(*2) For equity securities held for purposes other than short-term trading, an irrevocable election is available to designate them as FVTOCI financial assets.

As the requirements to classify a financial asset as either amortized cost or FVTOCI are more stringent in IFRS 9 than in IAS 39, the variability of net income may increase as the amount of FVTPL financial assets is increased due to the adoption of IFRS 9.

As of year-end the Group currently holds loans and receivables amounting to 267,106,204 million Won, held-to-maturity financial assets amounting to 16,749,296 million Won. This amount includes 51,653 million Won of hybrid contracts in which the host contract, after separating the embedded derivatives, is a debt security. In addition, The group also holds available-for-sale financial assets amounting to 15,352,950 million Won, and FVTPL financial assets (except derivatives) amounting to 2,727,302 million Won as of year end in accordance with IAS 39.

According to IFRS 9, a financial asset may be measured at amortized cost only when its cashflows are solely principal and interest on specified dates on the contract and when the purpose of holding such asset is only to receive the contractual cashflows.

The estimated impact on the classification and measurement of Group’s financial assets (except derivatives) as of year-end is presented as follows. The following information is constructed from the accounting system for financial instruments built for the purpose of adopting IFRS 9.

(Unit : Korean Won in millions)

Classification per IAS 39	Classification per IFRS 9	Carrying Amount per IAS 39		Carrying Amount per IFRS 9
Loans and receivables (Deposits)	Amortized cost		8,870,835		8,870,835
Financial assets at FVTPL (Deposits)	FVTPL		25,972		25,972
Financial assets at FVTPL (Debt securities)	FVTPL		2,654,027		2,654,027
AFS financial assets (Debt securities)	FVTPL		46,855		46,855
AFS financial assets (Debt securities)	FVTOCI		12,874,209		12,874,209
AFS financial assets (Debt securities)	Amortized cost		308,181		322,300
Held-to-maturity financial assets (Debt securities)	Amortized cost		16,749,296		16,749,296
Financial assets at FVTPL (Equity securities)	FVTPL		47,304		47,304
AFS financial assets (Equity securities)	FVTPL		1,273,498		1,274,716
AFS financial assets (Equity securities)	FVTOCI		850,207		850,207
Loans and receivables (Loans)	FVTPL		279,032		280,001
Loans and receivables (Loans)	Amortized cost		253,014,491		253,014,491
Loans and receivables (Other financial assets)	Amortized cost		6,772,088		6,772,088
Total financial assets except derivatives			303,765,995		303,782,301

Among the financial assets measured at amortized cost, loans and receivables and held-to-maturity financial assets amounting to 279,032 million Won and AFS financial assets amounting to 1,320,353 million Won would be reclassified to FVTPL financial assets as a result of adopting IFRS 9.

b) Classification and Measurement of Financial Liabilities

According to the IFRS 9, the amount of changes in the fair value of financial liabilities measured at FVTPL due to changes in credit risk is presented as part of other comprehensive income, and such amount is not recycled subsequently in profit or loss. However, when recognizing the fair value changes in other comprehensive income causes or magnifies accounting discrepancies, the amount is recognized in profit or loss instead.

As of year-end the Group holds financial liabilities amounting to 294,809,262 million Won, and out of this amount 251,796 million Won has been designated as FVTPL financial liabilities. In relation to these financial liabilities, the increase in fair value amounting to 31,275 million Won has been recognized as losses for the year ended 2017 in accordance with IAS 39.

The results of the analysis conducted to determine the financial impact of applying IFRS 9 on FVTPL financial liabilities as of year-end show that the cumulative changes in fair value of FVTPL financial liabilities as a result of changes in credit risk amounted to 133 million Won.

c) Impairment: Financial assets and Contract assets

IFRS 9 requires the recognition of allowance for expected credit losses for debt instruments, lease receivables, contract assets, loan commitments and financial guarantee contracts measured at either amortized cost or FVTOCI.

The allowance to be recognized under IFRS 9 is the amount of expected 12-month credit loss or the expected lifetime credit loss, according to the 3 stages of credit risk deterioration since initial recognition as shown below.

	Stage 1	Stage 2	Stage 3
	Credit risk has not significantly increased since initial recognition(*)	Credit risk has significantly increased since initial recognition	Credit has been impaired
Allowance for expected credit losses	Expected 12-month credit losses: Expected credit losses due to possible defaults on financial instruments within 12-month period from the year-end.	Expected lifetime credit losses: Expected credit losses from all possible defaults during the expected lifetime of the financial instruments.

(*) Credit risk may be considered to not have been significantly increased when credit risk is low at the reporting date. The Group considers that a financial asset’s credit risk is low when its credit risk rating is equivalent to the generally understood definition of “investment grade”.

Meanwhile, for purchased or originated credit impaired assets, the allowance for expected credit losses per IFRS 9 is the amount of cumulative changes in the expected lifetime credit losses after its initial recognition.

Determining a significant increase in credit risk since initial recognition

The Group assess when a significant increase in credit risk has occurred based on quantitative and qualitative assessments. For the financial assets subject to the impairment provision of IFRS 9, it is considered to have a significant increase in credit risk and are moved to stage 2 when the following indicator exists:

• Credit rating decrease by more than the agreed threshold relative to the credit rating at initial recognition

• Accounts that is classified as precautious level defined by Financial Supervisory Service

• Borrower has financial difficulties or has early warning signal as defined by the Group

• Backstop criteria—accounts that are 30 calendar days or more past due.

Forward-looking information

Credit losses are the expected cash shortfalls from what is contractually due over the expected life of the financial instrument, discounted at the original effective interest rate. Expected credit losses (ECL) are the unbiased probability-weighted credit losses determined by evaluating a range of possible outcomes and considering future economic conditions. The Group incorporated forward-looking information by using statistical analysis on various macroeconomic variables. The Group has integrated such results in modelling probability of default (PD)

Modeling techniques

ECL are calculated by multiplying three main components, being the PD, loss given default and the exposure at default, discounted at the original effective interest rate. ECL is measured at the individual financial instrument level, however a collective approach where financial instruments with similar risk characteristics are grouped together, with apportionment to individual financial instruments, is used where effects can only be seen at collective level.

For the IFRS 9 impairment assessment, the Group developed models are used to determine the probability of default, loss given default and exposure at default. For stage 2 and 3, the Group applies lifetime PDs but uses 12 month PDs for stage 1. The ECL drivers of PD, exposure at default and loss given default are modelled at an account level which considers historical data available by the Group.

As of year-end the Group holds loans and receivables amounting to 267,106,204 million Won in accordance with IAS 39. In relation to this amount, the Group has recognized allowance for credit losses amounting to 1,830,242 million Won.

The expected impact on the allowance for credit losses as of year-end using the Group’s system for allowances is as follows.

(Unit : Korean Won in millions)

	Allowance for credit losses per IAS 39 (A)		Allowance for credit losses per IFRS 9 (B)		Increases(B-A)
Deposits		2,458		3,092		634
Debt securities		—		9,331		9,331
AFS debt securities		—		4,253		4,253
Held-to-maturity debt securities		—		5,078		5,078
Loan receivables and other financial assets		1,827,785		2,075,752		247,967
Guarantees		183,247		192,376		9,129
Loan commitments		66,115		104,887		38,772
Total		2,079,605		2,385,438		305,833

d) Hedge accounting

The requirements for hedge accounting in IFRS 9 has become more lenient as compared to IAS 39. That is, more financial instruments may now be considered to be a hedged item and/or a hedging instrument, the quantitative basis for evaluating high hedge effectiveness (80~125%) has been abolished, and the retroactive assessment requirement has also been abolished. These allow the firms to concentrate on hedging activities.

There are no significant impacts to the Group’s financial statements related to hedge accounting as a result of adopting IFRS 9.

e) Effect on regulatory capital ratios

Based on the analysis on IFRS 9, there are no significant impacts to the regulatory capital ratios.

Enactments to IFRS 15—Revenue from Contracts with Customers

The core principle under IFRS 15 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendments introduces a 5-step approach to revenue recognition and measurement: 1) Identify the contract with a customer, 2) Identify the performance obligations in the contract, 3) Determine the transaction price, 4) Allocate the transaction price to the performance obligations in the contract, 5) Recognize revenue when (or as) the entity satisfies a performance obligation. This standard will supersede IAS 11—Construction Contracts, IAS 18- Revenue, IFRIC 13—Customer Loyalty Programmes, IFRIC 15—Agreements for the Construction of Real Estate, IFRIC 18—Transfers of Assets from Customers, and SIC 31—Revenue-Barter Transactions Involving Advertising Services. The enactment is effective for annual periods beginning on or after 1 January 2018. The Group does not expect the enactments to have a significant impact on the consolidated financial statements.

Enactments to IFRS 16—Leases

IFRS 16 introduces a comprehensive model for the identification of lease arrangements and accountings treatments for both lessors and lessees. IFRS 16 will supersede the current lease guidance including IAS 17 Leases and the related interpretations. The enactments are effective for annual periods beginning on or after 1 January 2019.

IFRS 16 distinguishes leases and service contracts on the basis of whether an identified asset is controlled by a customer. Distinctions of operating leases and finance leases are removed for lessee accounting and is replaced by model where a right-of-use asset and corresponding liability have to be recognized for all leases by lessees except for short-term leases and leases of low value assets.

The right-of-use asset is initially measured at cost and subsequently measured at cost (subject to certain exceptions) less accumulated depreciation and impairment losses, adjusted for any remeasurement of the lease liability. The lease liability is initially measured at the present value of the lease payments that are not paid at that date. Subsequently, the lease liability is adjusted for interest and lease payments, as well as the impact of lease modifications, amongst others. Furthermore, the classification of cash flows will also be affected as operating lease payments under IAS 17 are presented as operating cash flows; whereas under the IFRS 16 model, the lease payments will be split into a principal and an interest portion which will be presented as financing and operating cash flows respectively.

In contrast to lessee accounting, IFRS 16 substantially carries forward the lessor accounting requirements in IAS 17, and continues to require a lessor to classify a lease either as an operating lease or a finance lease. Furthermore, extensive disclosures are required by IFRS 16.

In contrast, 1) for finance leases where the Group is a lessee and 2) in cases where the Group is a lessor, the Group do not anticipate that the application of IFRS 16 will have a significant impact on the amounts recognized in the Group’s consolidated financial statements.

Amendments to IFRS 2—Share-based Payment

The amendments include: 1) when measuring the fair value of share-based payment, the effects of vesting and non-vesting conditions on the measurement of cash-settled share-based payment should be consistent with the measurement of equity-settled share-based payment, 2) Share-based payment transaction in which the Group settles the share-based payment arrangement net by withholding a specified portion of the equity instruments per statutory tax withholding requirements would be classified as equity-settled in its entirety, if otherwise would be classified as equity-settled without the net settlement feature, and 3) when a cash-settled share-based payment changes to an equity-settled share-based payment because of modifications of the terms and conditions, the original liability recognized is derecognized and the equity-settled share-based payment is recognized at the modification date fair value. Any difference between the carrying amount of the liability at the modification date and the amount recognized in equity at the same date would be recognized in profit and loss immediately. The amendments are effective for annual periods beginning on or after January 1, 2018. The Group does not expect the amendments to have a significant impact on the consolidated financial statements.

Amendments to IAS 40—Transfers of Investment Property

The amendments clarify that a transfer to, or from, investment property necessitates an assessment of whether a property meets, or has ceased to meet, the definition of investment property, supported by observable evidence that a change in use has occurred. The amendments further clarify that situations other than the ones listed in IAS 40 may evidence a change in use, and that a change in use is possible for properties under construction (i.e. a change in use is not limited to completed properties).

The amendments are effective for annual periods beginning on or after January 1, 2018 with earlier application permitted. Entities can apply the amendments either retrospectively (if this is possible without the use of hindsight) or prospectively. The Group does not expect the amendments to have a significant impact on the consolidated financial statements.

Enactments to IFRIC 22—Foreign Currency Transactions and Advance Consideration

The interpretation addresses how to determine the ‘date of transaction’ for the purpose of determining the exchange rate to use on initial recognition of an asset, expense or income, when consideration for that item has been paid or received in advance in a foreign currency which resulted in the recognition of a non-monetary asset or non-monetary liability (e.g. a non-refundable deposit or deferred revenue).

The interpretation specifies that the date of transaction is the date on which the entity initially recognizes the non-monetary asset on non-monetary liability arising from the payment or receipt of advance consideration. If there are multiple payments or receipts in advance, the interpretation requires an entity to determine the date of transaction for each payment or receipt of advance consideration. The Group does not expect the enactments to have a significant impact on the consolidated financial statements.

The interpretation is effective for annual periods beginning on or after January 1, 2018 with earlier application permitted. Entities can apply the interpretation either retrospectively or prospectively. Specific transition provisions apply to prospective application.

Basis of consolidated financial statement presentation

(2) Basis of consolidated financial statement presentation

The consolidated financial statements incorporate the financial statements of the Bank and its subsidiaries (including structured entities) controlled by the Bank (the “Group”). The Group determines that the Group controls an investee if the Group has all the following: 1) power over the investee, 2) exposure, or rights, to variable returns from its involvement with the investee, 3) the ability to use its power over the investee to affect the amount of the investor’s returns. The Group reassesses whether or not it controls an investee if facts and circumstances indicate that there are changes to one or more of the three elements of control listed above.

When the Group has less than a majority of the voting rights of an investee, it still has the power over the investee if the voting rights are sufficient to give it the practical ability to direct the relevant activities of the investee unilaterally.

The Group considers all relevant facts and circumstances in assessing whether or not the Group’s voting rights in an investee are sufficient to give it power, including:

• The size of the Group’s holding of voting rights relative to the size and dispersion of holdings of the other vote holders;

• Potential voting rights held by the Group, other vote holders or other parties;

• Rights arising from other contractual arrangements; or

• Any additional facts and circumstances that indicate that the Group has, or does not have, the current ability to direct the relevant activities at the time that decisions need to be made, including voting patterns at previous shareholders’ meetings.

Income and expenses of subsidiaries acquired or disposed of during the year are included in the consolidated statements of comprehensive income from the effective date of acquisition or up to the effective date of disposal, respectively, as appropriate. The carrying amount of non-controlling interests is adjusted to reflect their proportional share of changes in equity subsequent to the initial recognition. Total comprehensive income of subsidiaries is attributed to the owners of the Group and the non-controlling interests even if this result in the non-controlling interests has a deficit balance.

When necessary, adjustments are made to the financial statements of subsidiaries to bring their accounting policies in line with those adopted by the Group.

All intra-group transactions, related assets and liabilities, income and expenses are eliminated in full on consolidation.

Changes in the Group’s ownership interests in subsidiaries, without a loss of control, are accounted for as equity transactions. The carrying amounts of the owners’ interests and the non-controlling interests are adjusted to reflect the changes in their relative interests in the subsidiaries. Any difference between the adjusted non-controlling interests and the fair value of the consideration paid or received is recognized directly in equity and attributed to owners of the Group.

When the Group loses control of a subsidiary, the profit or loss on disposal is calculated as the difference between (i) the aggregate of the fair value of the consideration received and the fair value of any retained interest and (ii) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling interests. When the assets of the subsidiary are carried at revalued amounts or fair values and the related cumulative gain or loss has been recognized in other comprehensive income and accumulated in equity, the amounts previously recognized in other comprehensive income and accumulated in equity are accounted for as if the Group had directly disposed of the relevant assets (i.e. reclassified to net income or transferred directly to retained earnings). The fair value of any investment retained in the former subsidiary at the date when control is lost is recognized as the fair value on initial recognition for subsequent accounting under IAS 39 Financial Instruments: Recognition and Measurement or, when applicable, the cost on initial recognition of an investment in an associate or a joint venture.

Business combinations

(3) Business combinations

Acquisitions of subsidiaries and businesses are accounted for using the acquisition method. The consideration transferred in a business combination is measured at fair value, which is calculated as the sum of the acquisition-date fair values of the assets transferred by the Group, liabilities assumed by the Group to the former owners of the acquiree and the equity interests issued by the Group in exchange for control of the acquiree. Acquisition-related costs are generally recognized in net income as incurred.

At the acquisition date, the acquiree’s identifiable assets, liabilities and contingent liabilities that meet the condition for recognition under IFRS 3 are recognized at their fair value, except that:

• deferred tax assets or liabilities and assets or liabilities related to employee benefit arrangements are recognized and measured in accordance with IAS 12 Income Taxes and IAS 19 Employee Benefits, respectively;

• liabilities or equity instruments related to share-based payment arrangements of the acquiree or share-based payment arrangements of the Group entered into to replace share-based payment arrangements of the acquiree are measured in accordance with IFRS 2 Share-based Payment at the acquisition date; and

• non-current assets (or disposal groups) that are classified as held for sale in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations are measured at the lower of their previous carrying amounts and fair value less costs to sell.

Any excess of the sum of the consideration transferred, the amount of any non-controlling interest in the acquiree and the fair value of the Group’s previously held equity interest (if any) in the acquiree over the net of identifiable assets and liabilities assumed of the acquiree at the acquisition date is recognized as goodwill which is included in intangible assets.

If, after reassessment, the Group’s interest in the fair value of the acquiree’s identifiable net assets exceeds the sum of the consideration transferred, the amount of any non-controlling interest in the acquiree and the fair value of the acquirer’s previously held equity interest in the acquiree (if any), the excess is recognized immediately in net income as a bargain purchase gain.

Non-controlling interests that are present ownership interests and entitle their holders to a proportionate share of the entity’s net assets in the event of liquidation may be initially measured either at fair value or at the non-controlling interests’ proportionate share of the recognized amounts of the acquiree’s identifiable net assets. The choice of measurement basis is made on a transaction-by-transaction basis. Other types of non-controlling interests are measured at fair value or, when applicable, on the basis specified in another IFRSs.

When the consideration transferred by the Group in a business combination includes assets or liabilities resulting from a contingent consideration arrangement, the contingent consideration is measured at its acquisition-date fair value and included as part of the consideration transferred in a business combination. Changes in the fair value of the contingent consideration that qualify as measurement period adjustments are adjusted retrospectively, with corresponding adjustments against goodwill. Measurement period adjustments are adjustments that arise from additional information obtained during the ‘measurement period’ (which cannot exceed one year from the acquisition date) about facts and circumstances that existed at the acquisition date.

The subsequent accounting for changes in the fair value of the contingent consideration that do not qualify as measurement period adjustments depends on how the contingent consideration is classified. Contingent consideration that is classified as equity is not remeasured at subsequent reporting dates and its subsequent settlement is accounted for within equity. Contingent consideration that is classified as an asset or a liability is remeasured at subsequent reporting dates in accordance with IAS 39 Financial Instruments: Recognition and Measurement, or IAS 37 Provisions, Contingent Liabilities and Contingent Assets, as appropriate, with the corresponding gain or loss being recognized in profit or loss.

When a business combination is achieved in stages, the Group’s previously held equity interest in the acquiree is remeasured at fair value at the acquisition date (i.e. the date when the Group obtains control) and the resulting gain or loss, if any, is recognized in net income. Amounts arising from changes in value of interests in the acquiree prior to the acquisition date that have previously been recognized in other comprehensive income are reclassified to net income where such treatment would be appropriate if that interest were disposed of.

In case where i) a common entity ultimately controls over all participating entities, or businesses, in business combination transaction, prior to and after the transaction continuously, and ii) the control is not temporary, the transaction meets the definition of “business combination under common control” and it is deemed that the transaction only results in the changes in legal substance, not economic substance, from the perspective of the ultimate controlling party. Thus, in such transactions, the acquirer recognizes the assets and liabilities of the acquiree on its financial statements at the book values as recognized in the ultimate controlling party’s consolidated financial statements, and the difference between the book value of consideration transferred to and the book value of net assets transferred in is recognized as equity.

Investments in joint ventures and associates

(4) Investments in joint ventures and associates

An associate is an entity over which the Group has significant influence. Significant influence is the power to participate in making decision on the financial and operating policy of the investee but is not control or joint control over those policies.

A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement have rights to net assets relating to the arrangement. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control.

The net income of current period and the financial results of the joint ventures and associates are incorporated in these consolidated financial statements using the equity method of accounting, except when the investment is classified as held for sale, in which case it is accounted for in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations. Under the equity method, an investment in the joint ventures and associates is initially recognized in the consolidated statements of financial position at cost and adjusted thereafter to recognize the Group’s share of the net assets of the joint ventures and associates and any impairment. When the Group’s share of losses of the joint ventures and associates exceeds the Group’s interest in the associate (including any long term interests that, in substance, form part of the entity’s net investment in the associate or joint venture), the Group discontinues recognizing its share of further losses. Additional losses are recognized only to the extent that the Group has incurred legal or constructive obligations or made payments on behalf of the joint ventures and associates.

Any excess of the cost of acquisition over the Group’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities of the joint ventures and associates recognized at the date of acquisition is recognized as goodwill, which is included within the carrying amount of the investment. Any excess of the Group’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities over the cost of acquisition is recognized immediately in net income.

Upon a loss of significant influence over the joint ventures and associates, the Group discontinues the use of the equity method and measures at fair value of any investment that the Group retains in the former joint ventures and associates from the date when the Group loses significant influence. The fair value of the investment is regarded as its fair value on initial recognition as a financial asset in accordance with IAS 39 Financial Instruments; Recognition and Measurement. The Group recognized differences between the carrying amount and fair value in net income and it is included in determination of the gain or loss on disposal of joint ventures and associates. The Group accounts for all amounts recognized in other comprehensive income in relation to that joint ventures and associates on the same basis as would be required if the joint ventures and associates had directly disposed of the related assets or liabilities. Therefore, if a gain or loss previously recognized in other comprehensive income by an associate would be reclassified to net income on the disposal of the related assets or liabilities, the Group reclassifies the gain or loss from equity to net income as a reclassification adjustment.

When the Group’s ownership of interest in an associate or a joint venture decreases but the Group continues to maintain significant influence over an associate or a joint venture, the Group reclassifies to profit or loss the proportion of the gain or loss that had previously been recognized in other comprehensive income relating to that decrease in ownership interest if the gain or loss would be reclassified to profit or loss on the disposal of the related assets or liabilities. Meanwhile, if interest on associate or joint venture meets the definition of non-current asset held for sale, it is accounted for in accordance with IFRS 5.

The requirements of IAS 39 Financial Instruments: Recognition and Measurement to determine whether there has been a loss event are applied to identify whether it is necessary to recognize any impairment loss with respect to the Group’s investment in the joint ventures and associates. When necessary, the entire carrying amount of the investment (including goodwill) is tested for impairment in accordance with IAS 36 Impairment of Assets as a single asset by comparing its recoverable amount (higher of value in use and fair value less costs to sell) with its carrying amount. Any impairment loss recognized is not allocated to any asset (including goodwill), which forms part of the carrying amount of the investment. Any reversal of that impairment loss is recognized in accordance with IAS 36 to the extent that the recoverable amount of the investment subsequently increases.

The Group continues to use the equity method when an investment in an associate becomes an investment in a joint venture or an investment in a joint venture becomes an investment in an associate. There is no remeasurement to fair value upon such changes in ownership interests.

When a subsidiary transacts with an associate or a joint venture of the Group, profits and losses resulting from the transactions with the associate or joint venture are recognized in the Group’s consolidated financial statements only to the extent of interests in the associate or joint venture that are not related to the Group.

Investment in joint operation

(5) Investment in joint operation

A joint operation is a joint arrangement whereby the parties that have joint control of the arrangement have rights to the assets, and obligations for the liabilities, relating to the arrangement. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control.

When the Group operates as a joint operator, it recognizes in relation to its interest in a joint operation:

(a) its assets, including its share of any assets held jointly;

(b) its liabilities, including its share of any liabilities incurred jointly;

(c) its revenue from the sale of its share of the output arising from the joint operation;

(d) its share of the revenue from the sale of the output by the joint operation; and

(e) its expenses, including its share of any expenses incurred jointly.

The Group accounts for the assets, liabilities, revenues and expenses relating to its interest in a joint operation in accordance with the IFRSs applicable to the particular assets, liabilities, revenues and expenses.

When the Group enters into a transaction with a joint operation in which it is a joint operator, such as a sale or contribution of assets, it is conducting the transaction with the other parties to the joint operation and, as such, the Group recognizes gains and losses resulting from such a transaction only to the extent of the other parties’ interests in the joint operation.

When the Group enters into a transaction with a joint operation in which it is a joint operator, such as a purchase of assets, it does not recognize its share of the gains and losses until it resells those assets to a third party.

Revenue recognition

(6) Revenue recognition

1) Interest income

Interest income is recognized when earned. Interest income on financial assets that are classified as loans and receivables, available-for-sale or held-to-maturity is determined using the effective interest method.

The effective interest method is a method of calculating the amortized cost of a financial asset (or group of financial assets) and of allocating the interest income over the expected life of the asset. The effective interest rate is the rate that exactly discounts estimated future cash flows to the instrument’s initial carrying amount. Calculation of the effective interest rate takes into account fees payable or receivable that is an integral part of the instrument’s yield, premiums or discounts on acquisition or issue, early redemption fees and transaction costs. All contractual terms of a financial instrument are considered when estimating future cash flows.

2) Loan origination fees and costs

The commission fees earned on loans, which is part of the effective interest rate of loans, is accounted for as deferred origination fees. Incremental cost related to the acquisition or disposal is accounted for deferred origination costs, and it is amortized on the effective interest method and included in interest revenues on loans.

3) Fees and commissions income

Commitment and utilization fees are determined as a percentage of the outstanding facility. If it is unlikely that a specific lending arrangement will be entered into, such fees are taken to net income over the life of the facility, otherwise, they are deferred and included in the effective interest rate on the advance.

Fees in respect of services are recognized as the right to consideration accrues through the provision of the service to the customer. The arrangements are generally contractual and the cost of providing the service is incurred as the service is rendered. The price is usually fixed and determinable.

Credit card fees include commission received from merchants for processing credit card transaction and annual fees received from credit card holders. Revenue from the commission is accrued to net income when the service is performed and annual fee is deferred and recognized as income over the period of the service provided.

4) Trust fees and compensation related to trust accounts

The Group receives fees for its management of unconsolidated trust assets, which are recognized on an accrual basis when the management services are provided and earned. The Group also is entitled to receive performance-based fees for certain trust accounts. These performance-based fees are recognized at the end of the performance period. In addition, a certain trust account which the Group guarantees to repay the principals and minimum interests of the trust account to its beneficiaries shall be included in the consolidated financial statements. The Group recognizes incomes when earned and expenses when interests to be paid to beneficiaries are accrued.

Accounting for foreign currencies

(7) Accounting for foreign currencies

The Group’s consolidated financial statements are presented in Korean Won, which is the functional currency of the Bank. At the end of each reporting period, monetary assets and liabilities denominated in foreign currencies are translated to the functional currency at its prevailing exchange rates at the date. Foreign exchange differences on monetary items that qualify as hedging instruments in a cash flow hedge or that form part of net investment in foreign operations are recognized in equity.

A monetary available-for-sale (“AFS”) financial asset is treated as if it were carried at amortized cost in the foreign currency. Accordingly, for such financial assets, exchange differences resulting from retranslating amortized cost are recognized in net income.

Non-monetary items denominated in foreign currencies that are stated at fair value are translated into Korean Won at foreign exchange rates at the dates the values were determined. Translation differences arising on non-monetary items measured at fair value are recognized in net income except for differences arising on non-monetary AFS financial assets, for example equity shares, which are included in the AFS reserve in equity unless the asset is the hedged item in a fair value hedge.

The Group identifies the most appropriate functional currency for each foreign operation based on the foreign operation’s activities. If Korean Won is not the foreign operation’s functional currency, its assets and liabilities, including goodwill and fair value adjustments arising on acquisition, are translated into Korean Won at foreign exchange rates at the end of each reporting date while the revenues and expenses are translated into Korean Won at average exchange rates for the period unless these do not approximate to the foreign exchange rates at the dates of the transactions. Foreign exchange differences arising on the translation of a foreign operation are recognized directly in equity and included in net income on its disposal.

Cash and cash equivalents

(8) Cash and cash equivalents

Cash and cash equivalents consist of cash on hand, demand deposits, interest-earning deposits with original maturities of up to 90 days of acquisition date and highly liquid investment assets that are readily convertible to known amounts of cash and subject to an insignificant risk of changes in value.

Financial assets and financial liabilities

(9) Financial assets and financial liabilities

1) Financial assets

A regular way purchase or sale is a purchase or sale of a financial asset under a contract whose term requires delivery of the asset within the time frame established generally by regulation or convention in the marketplace concerned.

On initial recognition, financial assets are classified into held-for-trading, designated as at fair value through profit or loss (“FVTPL”), AFS financial assets, held-to-maturity (“HTM”) investments and loans and receivables. Regular way purchases of financial assets classified as loans and receivables are recognized on settlement date; all other regular way transactions in financial assets are recognized on trade date.

a) Held-for-trading:

A financial asset is classified as held-for-trading if it is acquired principally for sale in the near term, or forms part of a portfolio of financial instruments that are managed together and for which there is evidence of short-term profit taking, or it is a derivative (not in a qualifying hedge relationship). Held-for-trading financial assets are recognized at fair value with transaction costs being recognized in net income. Subsequently they are measured at fair value. Gains and losses on held-for-trading financial assets are recognized in net income as they arise.

b) Designated as at FVTPL:

Financial assets may be designated as at FVTPL only if such designation (a) eliminates or significantly reduces a measurement or recognition inconsistency; (b) applies to a group of financial assets, financial liabilities or both, which is managed and performance is evaluated on a fair value basis; or (c) is related to a contract containing one or more embedded derivative that would be required to be separated from the host contract.

Financial assets designated by the Group on initial recognition as at FVTPL are recognized at fair value, with transaction costs recognized in net income, and are subsequently measured at fair value. Gains and losses on financial assets that are designated as at FVTPL are recognized in net income as they arise.

c) AFS financial assets:

Financial assets that are not classified as HTM; held-for-trading; designated as at FVTPL; or loans and receivables, are classified as AFS. Financial assets can be designated as AFS on initial recognition. AFS financial assets are initially recognized at fair value plus directly related transaction costs. They are subsequently measured at fair value. Unquoted equity investments whose fair value cannot be measured reliably are carried at cost and classified as AFS financial assets. Impairment losses in monetary and non-monetary AFS financial assets and dividends on non-monetary financial assets are recognized in net income. Interest revenue on monetary financial assets is calculated using the effective interest method and recognized as a net income. Changes in the fair value of AFS financial assets other than those resulting from retranslation of monetary AFS at the reporting date, and any related tax are reported in a separate component of shareholders’ equity until disposal, and then the cumulative gain or loss is recognized in net income.

d) HTM investments:

A financial asset may be classified as a HTM investment only if it has fixed or determinable payments, a fixed maturity, and the Group has the positive intention and ability to hold the financial asset to maturity. HTM investments are initially recognized at fair value plus directly related transaction costs. They are subsequently measured at amortized cost using the effective interest method less any impairment losses.

e) Loans and receivables:

Non-derivative financial assets with fixed or determinable repayments that are not quoted in an active market are classified as loans and receivables, except those that are classified as AFS or as held-for-trading, or designated as at FVTPL. Loans and receivables are initially recognized at fair value plus directly related transaction costs. They are subsequently measured at amortized cost using the effective interest method less any impairment losses. Interest income is recognized using the effective interest method, except for the short-term receivables to which the present value discount is not meaningful.

2) Financial liabilities

On initial recognition financial liabilities are classified into held-for-trading; designated as at FVTPL; or amortized cost. Issues of equity or financial liabilities measured at amortized cost are recognized on settlement date; all other regular way transactions in financial instruments are recognized on trade date.

a) Held-for-trading:

A financial liability is classified as held-for-trading if it is incurred principally for repurchase in the near term, or forms part of a portfolio of financial instruments that are managed together and for which there is an evidence of short-term profit taking, or it is a derivative (not in a qualifying hedge relationship). Held-for-trading financial liabilities are recognized at fair value with transaction costs being recognized in net income. Subsequently, they are measured at fair value. Gains and losses are recognized in net income as they arise.

b) Designated as at FVTPL:

Financial liabilities may be designated as at FVTPL only if such designation (a) eliminates or significantly reduces a measurement or recognition inconsistency; (b) applies to a group of financial liabilities or both that the Group manages and evaluates on a fair value basis; or (c) relates to an instrument that contains an embedded derivative which is not evidently closely related to the host contract. Financial liabilities that the Group designates on initial recognition as being at FVTPL are recognized at fair value, with transaction costs being recognized in net income, and are subsequently measured at fair value. Gains and losses on financial liabilities that are designated as at FVTPL are recognized in net income as they arise.

c) Amortized cost:

All other financial liabilities are measured at amortized cost using the effective interest method.

3) Reclassifications

Held-for-trading and AFS financial assets that meet the definition of loans and receivables (non-derivative financial assets with fixed or determinable payments that are not quoted in an active market) may be reclassified to loans and receivables if the Group has the intention and ability to hold the financial asset for the foreseeable future or until maturity. The Group typically regards the foreseeable future as twelve months from the date of reclassification. Reclassifications are made at fair value. This fair value becomes the asset’s new cost or amortized cost as appropriate. Gains and losses recognized up to the date of reclassification are not reversed.

4) Derecognition of financial assets and liabilities

The Group derecognizes a financial asset when the contractual right to the cash flows from the asset is expired, or when it transfers the financial asset and substantially all the risks and rewards of ownership of the asset to another company. If the Group neither transfers nor retains substantially all the risks and rewards of ownership and continues to control the transferred asset, the Group recognizes its retained interest in the asset and an associated liability for amounts it may have to pay. If the Group retains substantially all the risks and rewards of ownership of a transferred financial asset, the Group continues to recognize the financial asset and also recognizes a collateralized borrowing for the proceeds received.

On derecognition of a financial asset in its entirety, the difference between the asset’s carrying amount and the sum of the consideration received and receivable and the cumulated gain or loss that had been recognized in other comprehensive income and accumulated in equity is recognized in profit or loss.

On derecognition of a financial assets other than in its entirety (e.g. when the Group retains an option to repurchase part of a transferred asset, or it retains a residual interest and such an retained interest indicates that the transferor has neither transferred nor retained substantially all the risks and rewards of ownership and has retained control of the transferred asset), the Group allocates the previous carrying amount of the financial asset between the part it continues to recognize under continuing involvement, and the part it no longer recognizes on the basis of the relative fair value of those parts on the date of the transfer. The difference between the carrying amount allocated to the part that is no longer recognized and the sum of the consideration received for the part that is no longer recognized and any cumulative gain or loss allocated to it that had been recognized in other comprehensive income is recognized in profit or loss. A cumulative gain or loss that had been recognized in other comprehensive income is allocated between the part that continues to be recognized and the part that is no longer recognized on the basis of the relative fair value of those parts.

The Group derecognizes the financial liability, when Group’s obligations are discharged, cancelled or expired. The difference between paid cost and the carrying amount of financial liabilities is recorded in profit or loss.

5) Fair value of financial assets and liabilities

Financial instruments classified as held-for-trading or designated as at FVTPL and financial assets classified as AFS are recognized in the financial statements at fair value. All derivatives are measured at fair value.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in and orderly transaction between market participants at the measurement date. Fair values are determined from quoted prices in active markets for identical financial assets or financial liabilities where these are available. The Group characterizes active markets as those in which transactions for the asset or liability take place with sufficient frequency and volume to provide pricing information on an ongoing basis.

Where a financial instrument is not in active market characterized by low transaction volumes, price quotations which vary substantially among market participants, or in which minimal information is released publicly, fair values are established using valuation techniques relying on alternative market data or internally developed models using significant inputs that are generally readily observable from objective sources. Market data includes prices of financial instruments with similar maturities and characteristics, duration, interest rate yield curves, and measures of volatility. The amount determined to be fair value may incorporate the management of the Group’s own assumptions (including assumptions that the Group believes market participants would use in valuing the financial instruments and assumptions relating to appropriate risk adjustments for nonperformance and lack of marketability).

The valuation techniques used to estimate the fair value of the financial instruments include market approach and income approach, each of which involves a significant degree of judgment. Under the market approach, fair value is determined by reference to a recent transaction involving the financial instruments or by reference to observable valuation measures for comparable companies or assets.

Under the income approach, fair value is determined by converting future amounts (e.g., cash flows or earnings) to a single present amount (discounted) using current market expectations about the future amounts. In determining value under this approach, the Group makes assumptions regarding, among other things, revenues, operating income, depreciation and amortization, capital expenditures, income taxes, working capital needs, and terminal value of the financial investments. These valuation techniques involve a degree of estimation, the extent of which depends on the instrument’s complexity and the availability of market-based data.

The following are descriptions of valuation methodologies used by the Group to measure various financial instruments at fair value.

a) Financial assets at FVTPL and AFS financial assets:

The fair value of the securities included in financial assets at FVTPL and AFS financial assets are recognized in the consolidated statements of financial position based on available quoted market prices. For debt securities traded in the OTC market, the Group generally determines fair value based on prices obtained from independent pricing services. Specifically, with respect to independent pricing services, the Group obtains three prices per instrument from reputable independent pricing services in Korea, and generally uses the lowest of the prices obtained from such services without further adjustment. For non-marketable equity securities, the Group obtains prices from the independent pricing services. The Group validates prices received from such independent pricing services using a variety of means, including verification of the qualification of the independent pricing services, corroboration of the pricing by comparing the prices among the independent pricing services and by reference to other available market data, and review of the pricing model and assumptions used by the independent pricing services by the Group’s personnel who are familiar with market-related conditions.

b) Derivative assets and liabilities:

Quoted market prices are used for the Group’s exchange-traded derivatives, such as certain interest rate futures and option contracts. All of the Group’s derivatives that are traded in OTC markets where quoted market prices are not readily available are valued using internal valuation techniques. Valuation techniques and inputs to internally developed models depend on the type of derivative and nature of the underlying rate, price or index upon which the derivative’s value is based. If the model inputs for certain derivatives are not observable in a liquid market, significant judgments on the level of inputs used for valuation techniques are required.

c) Valuation Adjustments:

By using derivatives, the Group is exposed to credit risk if counterparties to the derivative contracts do not perform as expected. If counterparty fails to perform, counterparty credit risk is equal to the amount reported as a derivative asset in the consolidated statements of financial position. The amounts reported as a derivative asset are derivative contracts in a gain position. Few of the Group’s derivatives are listed on an exchange. The majority of derivative positions are valued using internally developed models that use as their basis observable market inputs. Therefore, an adjustment is necessary to reflect the credit quality of each counterparty to arrive at fair value. Counterparty credit risk adjustments are applied to derivative assets, such as OTC derivative instruments, when the market inputs used in valuation models may not be indicative of the creditworthiness of the counterparty. Adjustments are also made when valuing financial liabilities to reflect the Group’s own credit standing.

The adjustment is based on probability of default of a counterparty and loss given default. The adjustment also takes into account contractual factors designed to reduce the Group’s credit exposure to each counterparty. To the extent derivative assets (liabilities) are subject to master netting arrangements, the exposure used to calculate the credit risk adjustment is net of derivatives in a loss (gain) position with the same counterparty and cash collateral received (paid).

6) Impairment of the financial assets

The Group assesses at the end of each reporting date whether there is any objective evidence that a financial asset or group of financial assets classified as AFS, HTM or loans and receivables is impaired. A financial asset or portfolio of financial assets is impaired and an impairment loss incurs if there is an objective evidence of impairment as result of one or more events that occurred after the initial recognition of an asset and that event (or events) has an impact on the estimated future cash flows of the financial asset.

a) Financial assets carried at amortized cost:

If there is an objective evidence that an impairment loss on a financial asset or group of financial assets classified as HTM investments or as loans and receivables has been incurred, the Group measures the amount of the loss as the difference between the carrying amount of the asset or group of assets and the present value of estimated future cash flows from the asset or group of assets discounted at the effective interest rate of the instrument at initial recognition. For collateralized loans and receivables, estimated future cash flows include cash flows that may result from foreclosure less the costs of obtaining and selling the collateral.

Impairment losses are assessed individually for financial assets that are individually significant and assessed either individually or collectively for assets that are not individually significant. In making collective assessment of impairment, financial assets are grouped into portfolios on the basis of similar risk characteristics. Future cash flows from these portfolios are estimated on the basis of the contractual cash flows and historical loss experience for assets with similar credit risk characteristics. Historical loss experience is adjusted, on the basis of observable data, to reflect current conditions not affecting the period of historical experience.

Impairment losses are recognized in net income and the carrying amount of the financial asset or group of financial assets is reduced by establishing a provision for impairment losses. If, in a subsequent period, the amount of the impairment loss reduces and the reduction can be ascribed to an event after the impairment was recognized, the previously recognized loss is reversed by adjusting the provision. Once an impairment loss has been recognized on a financial asset or group of financial assets, interest income is recognized on the carrying amount using the rate of interest at which estimated future cash flows were discounted in measuring impairment.

It is not the Group’s usual practice to write-off the asset at the time an impairment loss is recognized. Impaired loans and receivables are written off (i.e. the impairment provision is applied in writing down the loan’s carrying value in full) when the Group concludes that there is no longer any realistic prospect of recovery of part or the entire loan. Amounts recovered after a loan has been written off are reflected to the provision for the period in which they are received.

b) Financial assets carried at fair value:

When a decline in the fair value of a financial asset classified as AFS has been recognized directly in other comprehensive income and there is an objective evidence that the asset is impaired, the cumulative loss is removed from other comprehensive income and recognized in net income. The loss is measured as the difference between the amortized cost of the financial asset and its current fair value. Impairment losses on AFS equity instruments are not reversed through net income, but those on AFS debt instruments are reversed, if there is a decrease in the cumulative impairment loss that is objectively related to a subsequent event.

Offsetting financial instruments

(10) Offsetting financial instruments

Financial assets and liabilities are presented in net in the consolidated statements of financial position when the Group has an enforceable legal right to set off and an intention to settle on a net basis or to realize an asset and settle the liability simultaneously.

Investment properties

(11) Investment properties

The Group classifies a property held to earn rentals and/or for capital appreciation as an investment property. Investment properties are measured initially at cost, including transaction costs, less subsequent depreciation and impairment.

Subsequent costs are included in the carrying amount of the asset or recognized as a separate asset if it is probable that future economic benefits associated with the assets will flow into the Group and the cost of an asset can be measured reliably. Routine maintenance and repairs are expensed as incurred.

While land is not depreciated, all other investment properties are depreciated based on the respective assets’ estimated useful lives using the straight-line method. The estimated useful lives, residual values and depreciation method are reviewed at the end of each reporting period, with the effect of any change in estimate accounted for on a prospective basis.

An investment property is derecognized from the consolidated financial statements on disposal or when it is permanently withdrawn from use and no future economic benefits are expected even from its disposal. The gain or loss on derecognition of an investment property is calculated as the difference between the net disposal proceeds and the carrying amount of the property and is recognized in profit or loss in the period of the derecognition.

Premises and equipment

(12) Premises and equipment

Premises and equipment are stated at cost less subsequent accumulated depreciation and accumulated impairment losses. The cost of an item of premises and equipment is directly attributable to their purchase or construction, which includes any costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management. It also includes the initial estimate of the costs of dismantling and removing the item and restoring the site on which it is located.

Subsequent costs to replace part of the premises and equipment are recognized in carrying amount of an asset or as an asset if it is probable that the future economic benefits associated with the assets will flow into the Group and the cost of an asset can be measured reliably. Routine maintenance and repairs are expensed as incurred.

While land is not depreciated, for all other premises and equipment, depreciation is charged to net income on a straight-line basis on the estimated economic useful lives as follows:

	Useful life
Buildings used for business purpose	35 to 57 years
Structures in leased office	4 to 5 years
Properties for business purpose	4 to 5 years
Leased assets	Useful lives of the same kind or similar other premises and equipment

The Group reassesses the depreciation method, the estimated useful lives and residual values of premises and equipment at the end of each reporting period. If expectations differ from previous estimates, the changes are accounted for as a change in an accounting estimate. When the carrying amount of a fixed asset exceeds the estimated recoverable amount, the carrying amount of such asset is reduced to the recoverable amount.

Intangible assets and goodwill

(13) Intangible assets and goodwill

Intangible assets are stated at the manufacturing cost or acquisition cost plus additional incidental expenses less accumulated amortization and accumulated impairment losses. The Group’s intangible assets are amortized on a straight-line basis on the estimated economic useful lives as follows. The estimated useful life and amortization method are reviewed at the end of each reporting period. If expectations differ from previous estimates, the changes are accounted for as a change in an accounting estimate.

	Useful life
Patents	10 years
Development costs	5 years
Software and others	4 to 5 years

In addition, when an indicator that intangible assets are impaired is noted, and the carrying amount of the asset exceeds the estimated recoverable amount of the asset, the carrying amount of the asset is reduced to its recoverable amount immediately.

Goodwill acquired in a business combination is included in intangible assets. Goodwill is not amortized but tested for impairment annually to the extent of reporting unit and when there is any indication of impairment.

Goodwill acquired is allocated to each of the Group’s cash-generating units (“CGU”) expected to benefit from the synergies of the combination. A CGU to which goodwill has been allocated is tested for impairment annually, or more frequently when there is indication that the CGU may be impaired. If the recoverable amount of the CGU is less than its carrying amount, the impairment loss is allocated first to reduce the carrying amount of any goodwill allocated to the CGU and then to the other assets of the CGU on a pro-rata basis based on the carrying amount of each asset in the CGU. Any impairment loss for goodwill is recognized directly in net income in the consolidated statements of comprehensive income. An impairment loss recognized for goodwill is not reversed in subsequent periods.

Impairment of non-monetary assets

(14) Impairment of non-monetary assets

Intangible assets with indefinite useful lives such as goodwill and membership, or intangible assets that are not yet available for use are tested for impairment annually, regardless of whether or not there is any indication of impairment. All other assets are tested for impairment when there is an objective indication that the carrying amount may not be recoverable, and if the indication exists. The Group estimates the recoverable amount. Recoverable amount is the higher of value in use and net fair value less costs to sell. If the recoverable amount of an asset is estimated to be less than its carrying amount, the carrying amount of the asset is reduced to its recoverable amount and such impairment loss is recognized immediately in net income.

Leases

(15) Leases

Leases are classified as finance leases whenever the terms of the lease transfer substantially all the risks and rewards of ownership to the lessee. All other leases are classified as operating leases.

1) As a lessor

Amounts due from lessees under finance leases are recognized as receivables at the amount of the Group’s net investment in the leases being the minimum lease payments and any unguaranteed residual value discount interest rate implicit in the lease. Finance lease income is allocated to accounting periods so as to reflect a constant periodic rate of return on the Group’s net investment outstanding in respect of the leases.

Rental income from operating leases is recognized on a straight-line basis over the term of the relevant lease. Initial direct costs incurred in negotiating and arranging an operating lease are added to the carrying amount of the leased asset and recognized on a straight-line basis over the lease term. Operating lease assets are included within other assets and depreciated over their useful lives.

2) As a lessee

Assets held under finance leases are initially recognized as assets of the Group at their fair value at the inception of the lease or, if lower, at the present value of the minimum lease payments. The corresponding liability to the lessor is included in the consolidated statements of financial position as a finance lease obligation. Lease payments are apportioned between finance expenses and reduction of the lease obligation so as to achieve a constant rate of interest on the remaining balance of the liability. Contingent rentals arising under finance leases are recognized as expenses in the periods in which they are incurred.

Operating lease payments are recognized as an expense on a straight-line basis over the lease term, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased asset are consumed. Contingent rentals arising under operating leases are recognized as expenses in the period in which they are incurred.

Derivative instruments

(16) Derivative instruments

Derivative instruments are classified as forward, futures, option, and swap, depending on the types of transactions and are classified as either trading or hedging depending on the purpose. Derivatives are initially recognized at fair value at the date the derivative contract is entered into and are subsequently measured to their fair value at the end of each reporting period. The resulting gain or loss is recognized in net income immediately unless the derivative is designated and effective as a hedging instrument.

A derivative embedded in a contract is accounted for as a stand-alone derivative if its economic characteristics are not closely related to the economic characteristics of the host contract; unless the entire contract is measured at fair value with changes in fair value recognized in net income.

The Group designates certain hedging instruments to (a) hedge of the exposure to changes in fair value of a recognized asset or liability or an unrecognized firm commitment (fair value hedge); (b) hedge of the exposure to variability in cash flows that is attributable to a particular risk associated with a recognized asset or liability or a highly probable forecasted transaction (cash flow hedge); and (c) hedge of a net investment in a foreign operation.

At the inception of the hedge relationship, the Group documents the relationship between the hedging instrument and the hedged item, along with its risk management objectives and its strategy for undertaking various hedge transactions. Furthermore, at the inception of the hedge and on an ongoing basis, the Group documents whether the hedging instrument is highly effective in offsetting changes in fair values or cash flows of the hedged item.

1) Fair value hedge

Changes in the fair value of derivatives that are designated and qualified as fair value hedges are recognized in net income immediately, together with any changes in the fair value of the hedged asset or liability that are attributable to the hedged risk. Hedge accounting is discontinued when the Group revokes the hedging relationship or when the hedging instrument is no longer qualified for hedge accounting. If the hedging instrument no longer meets the criteria for hedge accounting, the fair value adjustment to the carrying amount of the hedged item is amortized to net income from that date to maturity using the effective interest method.

2) Cash flow hedge

The effective portion of changes in the fair value of derivatives that are designated and qualified as cash flow hedges is recognized in other comprehensive income. The gain or loss relating to the ineffective portion is recognized immediately in net income. Amounts previously recognized in other comprehensive income and accumulated in equity are reclassified to net income when the hedged item is recognized in net income.

Hedge accounting is discontinued when the hedging instrument is expired or sold, or it is no longer qualified for hedge accounting, and any cumulative gain or loss in other comprehensive income remains in equity until the forecast transaction is ultimately recognized in net income. When a forecasted transaction is no longer expected to occur, the gain or loss accumulated in equity is recognized immediately in net income.

3) Net investment hedge

Hedges of net investments in foreign operations are accounted for similarly to cash flow hedges. The effective portion of changes in the fair value of the hedging instrument is recognized in equity while the ineffective portion is recognized immediately in net income. The cumulated gain and loss in other comprehensive income is reclassified from equity to profit or loss on the disposal or partial disposal of the foreign operations.

Assets (or Disposal group) held for sale

(17) Assets (or Disposal group) held for sale

The Group classifies a non-current asset (or disposal group) as held for sale if its carrying amount will be recovered principally through a sale transaction rather than through continuing use. For this, the non-current asset (or disposal group) must be available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such assets (or disposal groups) and its sale must be highly probable. For the sale to be highly probable, the appropriate level of management must be committed to a plan to sell the asset (or disposal group), and an active programme to locate a buyer and complete the plan must have been initiated. In addition, the sale should be expected to qualify for recognition as a completed sale within one year from the date of classification.

When the Group is committed to a sale plan involving loss of control of a subsidiary, all of the assets and liabilities of that subsidiary are classified as held for sale when the criteria described above are met, regardless of whether the Group will retain a non-controlling interest in its former subsidiary after the sale.

When the Group is committed to a sale plan involving disposal of an investment, or a portion of an investment, in an associate or joint venture, the investment or the portion of the investment that will be disposed of is classified as held for sale when the criteria described above are met, and the Group discontinues the use of the equity method in relation to the portion that is classified a held for sale. Any retained portion of an investment in an associate or a joint venture that has not been classified as held for sale continues to be accounted for using the equity method. The Group discontinues the use of the equity method at the time of disposal when the disposal results in the Group losing significant influence over the associate or joint venture.

After the disposal takes place, the Group accounts for any retained interest in the associate or joint venture in accordance with IAS 39 Financial Instruments: Recognition and Measurement unless the retained interest continues to be an associate or a joint venture, in which case the Group uses the equity method.

Non-current assets (and disposal groups) classified as held for sale are measured at the lower of their previous carrying amount and fair value less costs to sell.

Provisions

(18) Provisions

The Group recognizes provision if it has a present or contractual obligations as a result of the past event, it is probable that an outflow of resources will be required to settle the obligation, and the amount of the obligation is reliably estimated. Provision is not recognized for the future operating losses.

The Group recognizes provision related to the unused portion of point rewards earned by credit card customers, payment guarantees, loan commitment and litigations. Where the Group is required to restore a leased property that is used as a branch, to an agreed condition after the contractual term expires, the present value of expected amounts to be used to dispose, decommission or repair the facilities is recognized as an asset retirement obligation.

Where there are a number of similar obligations, the probability that an outflow will be required in settlement is determined by considering the obligations as a whole. Although the likelihood of outflow for any one item may be small, if it is probable that some outflow of resources will be needed to settle the obligations as a whole, a provision is recognized.

Capital and compound financial instruments

(19) Capital and compound financial instruments

The Group classifies a financial instrument that it issues as a financial liability or an equity instrument in accordance with the substance of the contractual arrangement. An instrument is classified as a liability if it is a contractual obligation to deliver cash or another financial asset, or to exchange financial assets or financial liabilities on potentially unfavourable terms. An instrument is classified as equity if it evidences a residual interest in the assets of the Group after the deduction of liabilities. The components of a compound financial instrument issued by the Group are classified and accounted for separately as financial liabilities or equity as appropriate.

If the Group reacquires its own equity instruments, those instruments (“treasury shares”) are presented as a deduction from total equity. The gain or loss on the purchase, sale, issue, or cancellation of treasury shares is not recognized in net income but recognized directly in equity.

Financial guarantee contracts

(20) Financial guarantee contracts

Under a financial guarantee contract, the Group, in return for a fee, undertakes to meet a customer’s obligations under the terms of a debt instrument if the customer fails to do so.

A financial guarantee is recognized as a liability; initially at fair value and will be amortized, if not designated as at FVTPL, subsequently at the higher of its initial value less cumulative amortization and any provision under the contract measured in accordance with provision policy. Amortization is calculated so as to recognize fees receivable in profit or loss over the period of the guarantee.

Employee benefits and pensions

(21) Employee benefits and pensions

The Group recognizes the undiscounted amount of short-term employee benefits expecting payment in exchange for the services, when employee renders services. Also, the Group recognizes expenses and liabilities in the case of accumulating compensated absences, when the employees render service that increases their entitlement to future compensated absences. Though the Group may have no legal obligation to pay a bonus, considering some cases, the Group has a practice of paying bonuses. In such cases, the Group has a constructive obligation, and thus recognizes expenses and liabilities when the employees render service.

The Group is operating defined contribution retirement pension plans and defined benefit retirement pension plans. Contributions to defined contribution retirement pension plans are recognized as an expense when employees have rendered service entitling them to the contributions. For defined benefit retirement pension plans, the cost of providing benefits is determined using the Projected Unit Credit Method, with actuarial valuations being carried out at the end of each reporting period. Remeasurement, comprising actuarial gains and losses, the effect of the changes to the asset ceiling (if applicable) and the return on plan assets (excluding interest), is reflected immediately in the statement of financial position with a charge or credit recognized in other comprehensive income in the period in which they occur.

Remeasurement recognized in other comprehensive income is reflected immediately in retained earnings and will not be reclassified to profit or loss. Past service cost is recognized in profit or loss in the period of a plan amendment. Net interest is calculated by applying the discount rate at the beginning of the period to the net defined benefit liability or asset. Defined benefit costs are composed of service cost (including current service cost, past service cost, as well as gains and losses on curtailments and settlements), net interest expense (income), and remeasurement.

The Group presents the service cost and net interest expense (income) components in profit or loss, and the remeasurement component in other comprehensive income. Curtailment gains and losses are accounted for as past service costs.

The retirement benefit obligation recognized in the consolidated statement of financial position represents the actual deficit or surplus in the Group’s defined benefit plans. Any surplus resulting from this calculation is limited to the present value of any economic benefits available in the form of refunds from the plans or reductions in future contributions to the plans.

Liabilities for termination benefits are recognized at the earlier of either 1) when the Group has become not able to cancel its proposal for termination benefits, or 2) when the Group has recognized the cost of restructuring that accompanies the payment of termination benefits.

Income taxes

(22) Income taxes

Income tax expense represents the sum of the tax currently payable and deferred tax. Current income tax expense approximates taxes to be paid or refunded for the current period and deferred income tax expense is provided on an asset and liability method whereby deferred tax assets are recognized for deductible temporary differences, including operating losses and tax credit carryforwards, and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the carrying values of assets and liabilities for financial reporting purposes and their tax bases. Deferred income tax benefit or expense is then recognized for the change in deferred tax assets or liabilities between periods. Deferred tax assets and liabilities are measured at the tax rates on the date of enactment or substantive enactment that are expected to apply in the period in which the liability is settled or the asset realized. Deferred tax assets, including the carryforwards of unused tax losses, are recognized to the extent it is probable that the deferred tax assets will be realized.

Deferred income tax assets and liabilities are offset if, and only if the Group has a legally enforceable right to offset current tax assets against current tax liabilities, and the deferred tax assets and liabilities relate to income taxes levied by the same taxation authority on either the taxable entity or different taxable entities which intend either to settle current tax liabilities and assets on a net basis.

The carrying amount of deferred tax assets is reviewed at the end of each reporting period and reduced to the extent that it is no longer probable that sufficient taxable profits will be available to allow all or part of the asset to be recovered.

Deferred liabilities are not recognized if the temporary difference arises from goodwill. Deferred tax assets or liabilities are not recognized if they arise from the initial recognition (other than in a business combination) of other assets and liabilities in a transaction that affects neither the taxable profit nor the accounting profit.

Current and deferred tax are recognized in profit or loss, except when they relate to items that are recognized in other comprehensive income or directly in equity, in which case, the current and deferred tax are also recognized in other comprehensive income or directly in equity respectively.

Earnings per share

(23) Earnings per share (“EPS”)

Basic EPS is calculated by earnings subtracting the dividends paid to holders of preferred stock and hybrid securities from the net income attributable to ordinary shareholders from the statements of comprehensive income and dividing by the weighted average number of common shares outstanding. Diluted EPS is calculated by adjusting the earnings and number of shares for the effects of all dilutive potential common shares.

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Significant accounting estimates and assumptions (Policies)

12 Months Ended

Dec. 31, 2017

Disclosure Of Accounting Judgements And Estimates Explanatory [Abstract]

Description of accounting policy for estimates and assumptions on income taxes [Text block]

The significant accounting estimates and assumptions are continually evaluated and are based on historical experiences and various factors including expectations of future events that are considered to be reasonable. Actual results can differ from those estimates based on such definitions.

The significant judgments which management has made about the application of the Group’s accounting policies and key sources of uncertainty in estimate do not differ from those used in preparing the consolidated financial statements for the year ended December 31, 2016.

(1) Income taxes

The Group is subject to income taxes in numerous jurisdictions, which requires significant judgment in determining realization of deferred tax. Actual tax payment may be different from the provision estimate and such difference may affect the income tax expense. There are various transactions and calculations for which the ultimate tax determination is uncertain. Deferred tax assets relating to tax losses carried forward and deductible temporary differences are recognized, only to the extent that it is probable that future taxable profit will be available against which the tax losses carried forward and the deductible temporary differences can be utilized. This assessment requires significant management estimates and judgments. Future taxable profit is estimated based on, among other relevant factors, forecasted operating results, which are based on historical financial performance. In the event the Group was to determine that it would be able to realize its deferred income tax assets in the future at an amount different than their net recorded amount, the Group would make an adjustment to the provision for income taxes at such time.

Description of accounting policy for estimates and assumptions on valuation of financial instruments [Text block]

(2) Valuation of financial instruments

Financial instruments classified as held-for trading or designated as at FVTPL and financial instruments classified as AFS are recognized in the financial statements at fair value. All derivatives are measured at fair value. Financial instruments, which are not traded in active market will have less objective fair value and require broad judgment in liquidity, concentration, uncertainty in market factors and assumption in price determination and other risks. The fair value of those assets is established by using valuation techniques.

As described in the significant accounting policies in Note 2-(9)-5), ‘ Fair value of financial assets and liabilities’, a range of valuation techniques, which include market approach and income approach and internally developed models that incorporate various types of assumptions and variables, are used to determine the fair value of financial instruments.

Description of accounting policy for estimates and assumptions on impairment of loans and receivables [Text block]

(3) Impairment of loan and receivables

Impairment loss for loan and receivables carried at amortized cost is measured as the difference between such assets’ carrying value and the present value of estimated recoverable cash flows (excluding any future loss events that have not occurred) discounted by using the initial effective interest rate. In the event that the estimated cash flow of the financial asset is affected by one or more loss events occurred after initial recognition, it is determined that the financial asset is impaired.

The objective evidences that a financial asset is impaired incorporate below loss events:

1) Financial assets that are individually significant

• Delinquent loans

• Debt in restructuring

• Probable state of debtor’s bankruptcy or liquidation

• Occurrence of significant reduction in the value of securities

• Breach of limit or debt covenant

• Deterioration of operating performance

2) Financial assets that are not individually significant

• Repayment status of debtor or observable macro-economic indexes

The Group first assesses whether objective evidence of impairment exists individually for financial assets that are individually significant (individual evaluation of impairment), and individually or collectively for financial assets that are not individually significant. If the Group determines that no objective evidence of impairment exists for an individually assessed financial asset, it includes the asset in a group of financial assets with similar credit risk characteristics and collectively assesses them for impairment (collective evaluation of impairment).

There are two components to the Group’s loan impairment provisions (individual and collective).

Individual assessment of impairment losses are calculated by discounting the expected future cash flows of a loan at its original effective interest rate and comparing the resultant present value with the loan’s carrying amount. This process normally encompasses management’s best estimate, such as operating cash flow of debtor and net realizable value of any collateral held and the timing of anticipated receipts.

Collective assessment of impairment losses are established on a portfolio basis using the methodology based on historical loss experience. The methodology based on historical loss experience is used to estimate inherent incurred loss on groups of assets for collective evaluation of impairment. Such methodology incorporates factors such as type of product and debtors, credit rating, portfolio size, loss emergence period and recovery period and applies probability of default on each assets (or pool of assets) and loss given default by type of collateral. Also, consistent assumptions are applied to form a formula-based model in estimating inherent loss and to determine factors on the basis of historical loss experience and current condition. The methodology and assumptions used for estimating future cash flows are reviewed regularly to reduce any differences between loss estimates and actual loss experience.

Description of accounting policy for estimates and assumptions on defined benefit plan [Text block]

(4) Defined benefit plan

The Group operates defined benefit retirement pension plans. Defined benefit retirement pension plans are measured through actuarial valuation and the Group estimates discount rate, future wage growth rate, mortality rates to produce actuarial valuation. Defined benefit retirement pension plans contain significant uncertainty in these estimates due to their long-term characteristic.

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General (Tables)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Consolidated subsidiaries

The consolidated financial statements for Woori Bank and its subsidiaries (the “Group”) include the following subsidiaries:

			Percentage of ownership (%)
Subsidiaries	Main business		December 31, 2016		December 31, 2017
Woori Bank:
Woori FIS Co., Ltd.		System software development & maintenance		100.0		100.0
Woori Private Equity Asset Management Co., Ltd.		Finance		100.0		100.0
Woori Finance Research Institute Co., Ltd.		Other service business		100.0		100.0
Woori Card Co., Ltd.		Finance		100.0		100.0
Woori Investment Bank Co., Ltd.(*1)		Other credit finance business		58.2		59.8
Woori Credit Information Co., Ltd.		Credit information		100.0		100.0
Woori America Bank		Finance		100.0		100.0
Woori Global Markets Asia Limited		”		100.0		100.0
Woori Bank China Limited		”		100.0		100.0
AO Woori Bank		”		100.0		100.0
PT Bank Woori Saudara Indonesia 1906 Tbk(*1)		”		74.0		79.9
Banco Woori Bank do Brasil S.A.		”		100.0		100.0
Korea BTL Infrastructure Fund		”		99.9		99.9
Woori Fund Service Co., Ltd.		”		100.0		100.0
Woori Finance Cambodia PLC.		”		100.0		100.0
Woori Finance Myanmar Co., Ltd.		”		100.0		100.0
Wealth Development Bank		”		51.0		51.0
Woori Bank Vietnam Limited		”		100.0		100.0
Kumho Trust First Co., Ltd.(*2)		Asset securitization		0.0		0.0
Asiana Saigon Inc.(*2)		”		0.0		0.0
An-Dong Raja First Co., Ltd.(*6)		”		0.0		—
Consus Eighth Co., LLC(*2)		”		0.0		0.0
KAMCO Value Recreation First Securitization Specialty Co., Ltd.(*2)		”		15.0		15.0
Hermes STX Co., Ltd.(*2)		”		0.0		0.0
BWL First Co., LLC(*2)		”		0.0		0.0
Woori Poongsan Co., Ltd.(*6)		”		0.0		—
Deogi Dream Fourth Co., Ltd.(*2)		”		0.0		0.0
Jeonju Iwon Ltd.(*2)		”		0.0		0.0
Wonju I one Inc.(*2)		”		0.0		0.0
Heitz Third Co., Ltd.(*2)		”		0.0		0.0
Woorihansoop 1st Co., Ltd.(*2)		”		0.0		0.0
Electric Cable First Co., Ltd(*2)		”		0.0		0.0
Woori International First Co., Ltd.(*2)		”		0.0		0.0
Woori HJ First Co., Ltd.(*2)		”		0.0		0.0
Woori WEBST 1st Co., Ltd.(*2)		”		—		0.0
HNLD 1st Inc.(*2)		”		—		0.0
Wibihansoop 1st Co., Ltd.(*2)		”		—		0.0
Uri QS 1st Co., Ltd(*2)		”		—		0.0
Uri Display 1st Co., Ltd.(*2)		”		—		0.0
Tiger Eyes 2nd Co., Ltd.(*2)		”		—		0.0
Woori Serveone 1st Co., Ltd.(*2)		”		—		0.0
HeungkukWoori Tech Company Private Placement Investment Trust No.1 and 5 beneficiary certificates(*3)		Securities investment and others		—		—
Principle Guaranteed Trust(*4)		Trust		0.0		0.0
Principle and Interest Guaranteed Trust(*4)		”		0.0		0.0
Woori Bank and Woori Private Equity Asset Management Co., Ltd.:
Woori Private Equity Fund(*5)		Other financial business		31.9		—
Woori Private Equity Fund:
Woori EL Co., Ltd.(*5)		Other financial business		100.0		—
Woori Investment Bank:
Dongwoo First Securitization Specialty Co., Ltd.(*2)		Asset securitization		5.0		5.0
Seari First Securitization Specialty Co., Ltd.(*2)		Asset securitization		—		5.0
Namjong 1st Securitization Specialty Co., Ltd.(*2)		”		—		5.0
Bukgeum First Securitization Specialty Co., Ltd.(*2)		”		—		5.0
Woori Card Co., Ltd.:
TUTU Finance-WCI Myanmar Co., Ltd.		Finance		100.0		100.0
Woori Card one of 2017-1 Securitization Specialty Co., Ltd.(*2)		Asset securitization		—		0.5
Woori Card one of 2017-2 Securitization Specialty Co., Ltd.(*2)		”		—		0.5

(*1) The entity issued a rights offering that entitles its existing shareholders to buy additional shares directly from the entity in proportion to its existing holders. But, some shareholders opted not to buy the new share and Woori Bank was able to purchase more shares than they would be in accordance with their ownership percentage. This purchase resulted in the increase of its ownership percentage.

(*2) The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

(*3) The entity is a structured entity for the purpose of investment in securities and is in scope for consolidation, considering that the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

(*4) The entity is a money trust under the Financial Investment Services and Capital Markets Act and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

(*5) Due to liquidation of Woori Private Equity Asset Management Co., Ltd. during the year ended December 31, 2017 the entity was excluded from the scope for consolidation.

(*6) Due to liquidation during the year ended of December 31, 2017, the entity was excluded from the scope for consolidation.”

Unconsolidated companies with more than 50 Percent ownership interests

As of December 31, 2016 and 2017, despite having more than a 50% ownership interests, the Group has not consolidated the following companies as the Group do not have the ability to control following subsidiaries:

	As of December 31, 2016
Entities	Location	Main business	Percentage of ownership (%)
Golden Bridge NHN Online Private Equity Investment(*1)	Korea	Securities Investment		60.0
Mirae Asset Maps Clean Water Private Equity Investment Trust 7th(*1)	Korea	Securities Investment		59.7
Kiwoom Yonsei Private Equity Investment Trust(*1)	Korea	Securities Investment		88.9
Kiwoom Frontier Professional Investment Private Fund 6 (Bond)(*2)	Korea	Securities Investment		50.0
	As of December 31, 2017
Subsidiaries	Location	Main Business	Percentage of ownership (%)
Golden Bridge NHN Online Private Equity Investment(*1)	Korea	Securities Investment		60.0
Mirae Asset Maps Clean Water Private Equity Investment Trust 7th(*1)	Korea	Securities Investment		59.7
Kiwoom Yonsei Private Equity Investment Trust(*1)	Korea	Securities Investment		88.9
Hana Walmart Real Estate Investment Trust 41-1(*1)	Korea	Securities Investment		90.1
IGIS Global Private Placement Real Estate Fund No. 148-1(*1)	Korea	Securities Investment		75.0
IGIS Global Private Placement Real Estate Fund No. 148-2(*1)	Korea	Securities Investment		75.0

(*1) The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.

(*2) Due to redemption of the fund during 2017, the fund was excluded from the list as of December 31, 2017 above.

Condensed financial information of significant investments in subsidiaries

The summarized financial information before the elimination of intercompany transactions of the subsidiaries whose financial information were prepared under IFRS for the Group’s consolidated financial statements is as follows (Unit: Korean Won in millions):

	As of and for the year ended December 31, 2016
	Assets		Liabilities		Operating revenue		Net income (loss) attributable to owners			Comprehensive income (loss) attributable to owners
Woori FIS Co., Ltd.		141,329		105,821		244,783		1,048			1,432
Woori Private Equity Asset Management Co., Ltd.		97,338		53,244		2,154		312			219
Woori Finance Research Institute Co., Ltd.		3,710		334		4,445		108			100
Woori Card Co., Ltd.		7,606,108		6,180,893		1,555,373		109,393			116,381
Woori Investment Bank Co., Ltd.		1,576,627		1,404,566		178,572		23,872			23,897
Woori Credit Information		31,292		4,416		27,884		543			618
Woori America Bank		2,186,049		1,973,263		73,909		15,266			20,899
Woori Global Markets Asia Limited		272,008		147,581		7,255		1,863			5,582
Woori Bank (China) Limited		4,984,017		4,466,812		475,174		32,025			11,505
AO Woori Bank		239,860		188,474		16,221		5,650			15,553
PT Bank Woori Saudara Indonesia 1906 Tbk		2,089,822		1,693,111		179,014		24,573			48,542
Banco Woori Bank do Brasil S.A.		241,229		206,043		17,059		2,786			9,600
Korea BTL Infrastructure Fund		784,770		299		33,476		29,617			29,617
Woori Fund Service Co., Ltd.		11,386		1,372		7,787		1,011			1,011
Woori Finance Cambodia PLC.		32,405		24,751		4,545		1,250			1,494
Woori Finance Myanmar Co., Ltd.		4,305		2,651		380		(613	)		(569	)
Wealth Development Bank		209,779		174,446		12,519		1,248			1,876
Woori Bank Vietnam Limited		159,223		278		—		(346	)		3,545
Money trust under the FISCM Act(*)		1,525,145		1,495,815		55,540		697			697
Structured entity for the securitization of financial assets		487,431		895,824		29,480		6,912			7,138
Structured entity for the investments in securities		4,397,163		1,898,977		137,896		56,605			61,535

	As of and for the year ended December 31, 2017
	Assets		Liabilities		Operating revenue		Net income (loss) attributable to owners			Comprehensive income (loss) attributable to owners
Woori FIS Co., Ltd.		103,932		71,386		252,460		1,940			(2,963	)
Woori Private Equity Asset Management Co., Ltd.		42,894		2,670		7,257		(4,114	)		(4,074	)
Woori Finance Research Institute Co., Ltd.		3,790		350		4,733		83			64
Woori Card Co., Ltd.		8,605,993		6,973,705		1,771,157		101,214			107,321
Woori Investment Bank Co., Ltd.		1,880,157		1,588,610		183,376		20,023			20,210
Woori Credit Information Co., Ltd.		33,298		6,175		31,580		861			752
Woori America Bank		1,954,301		1,679,248		81,337		11,869			(16,833	)
Woori Global Markets Asia Limited		290,226		178,343		11,345		1,922			(12,544	)
Woori Bank (China) Limited		4,960,637		4,458,683		388,913		13,809			(15,252	)
AO Woori Bank		201,704		149,101		15,656		4,748			1,217
PT Bank Woori Saudara Indonesia 1906 Tbk		2,230,617		1,745,171		192,485		38,488			(18,689	)
Banco Woori Bank do Brasil S.A.		213,889		181,544		20,455		1,843			(2,840	)
Korea BTL Infrastructure Fund		786,480		301		30,240		26,390			26,390
Woori Fund Service Co., Ltd.		12,653		1,242		9,021		1,398			1,398
Woori Finance Cambodia PLC.		51,304		32,873		5,895		983			(473	)
Woori Finance Myanmar Co., Ltd.		18,236		5,307		2,506		791			15
Wealth Development Bank		191,049		156,808		13,632		1,323			(1,093	)
Woori Bank Vietnam Limited		775,758		632,160		29,698		2,436			(15,347	)
Money trust under the FISCM Act(*)		1,560,672		1,530,760		44,344		582			582
Structured entity for the securitization of financial assets		867,583		1,275,719		22,730		1,179			(2,800	)
Structured entity for the investments in securities		34,939		76		377		(475	)		(38,592	)

(*) FISCM Act: Financial Investment Services and Capital Markets Act

Financial informations Maximum exposure and Loss recognised of unconsolidated structured entities

Unconsolidated structured entities

The Group has entered into various agreements with structured entities such as asset securitization vehicles, and structured finance and investment funds. Where it is determined in accordance with IFRS 10 that the Group has no controlling power over such structured entities, the entities are not consolidated. The nature of interests, which the Group retains, and the risks, to which the Group is exposed, of the unconsolidated structured entities are as follows:

Asset securitization vehicle issues asset-backed securities and redeems the principal and interest or distributes dividends on asset-backed securities with profits from collecting cash flows or sale of securitized assets. The Group, as a secondary guarantor, provides purchase commitments for its asset-backed securities or guarantees to such asset securitization vehicle and recognizes commission income or interest income related to the commitment or guarantees. Therefore, the Group would be exposed to risks to purchases or pays back asset-backed securities issued by the vehicles when a primary guarantor fails to provide the financing asset securitization vehicles.

Structured finance includes investments in project financing on real estates, social overhead capital (“SOC”), infrastructure and shipping finance. They are formed as special purpose entity by funding through equity investments and loans from various investors. Investment decisions are made by the Group based on business outlook of such projects. In relation to such investments, the Group recognizes interest income on loans, gains or losses on valuation of equity investments or dividend income. The structured finance is secured by additional funding agreement, guarantee or credit facilities. However, the structured financing project would fail to return the capital of equity investments or principal of loans to the Group if it is discontinued or did not achieve business outcome.

Investment funds include trusts and private equity funds. A trust is formed by contributions from various investors, operated by a manager engaged to the trust and distributed proceeds from sales of investments to the investors. A private equity fund is established in order to acquire ownership interests in a portfolio company with exit strategy after implementing financial and operational restructuring of the company. The Group recognizes unrealized gains or losses on change in value of investments in proposition of ownership interests in investments. The Group would be exposed to risks of loss when the value of portfolio investment is decreased.

Total assets of the unconsolidated structured entities, the carrying value of the related items recorded, the maximum exposure to risks, and the loss recognized in conjunction with the unconsolidated structured entities as of December 31, 2016 and 2017 are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Asset securitization vehicle		Structured finance		Investment Funds
Total asset of the unconsolidated structured entities		8,426,713		61,324,862		9,131,362
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities		3,361,910		2,790,215		1,749,494
Loans and receivables		65,470		2,414,044		—
Financial assets held for trading		—		254,150		—
Available-for-sale financial assets		1,216,446		115,843		1,664,865
Held-to-maturity financial assets		2,079,648		—		—
Investments in joint ventures and associates		—		—		84,629
Derivative assets		346		6,178		—
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities		1,363		1,224		—
Derivative liabilities		201		362		—
Other liabilities (including provisions)		1,162		862		—
The maximum exposure to risks		4,263,993		3,802,210		1,749,494
Investments		3,361,910		2,790,215		1,749,494
Purchase agreements		28,000		—		—
Credit facilities		834,083		970,195		—
Other commitments		40,000		41,800		—
Loss recognized on unconsolidated structured entities		6,353		71,185		683

	December 31, 2017
	Asset securitization vehicle		Structured finance		Investment Funds
Total asset of the unconsolidated structured entities		7,295,601		40,172,830		13,641,135
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities		3,215,159		2,314,043		1,138,523
Loans and receivables		43,180		1,969,760		—
Financial assets held for trading		—		233,428		10,160
Available-for-sale financial assets		902,390		106,819		904,774
Held-to-maturity financial assets		2,269,451		—		—
Investments in joint ventures and associates		—		—		223,589
Derivative assets		138		4,036		—
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities		1,433		1,506		—
Derivative liabilities		575		968		—
Other liabilities (including provisions)		858		538		—
The maximum exposure to risks		4,032,531		2,918,448		1,138,523
Investments		3,215,159		2,314,043		1,138,523
Credit facilities		817,372		604,405		—
Loss recognized on unconsolidated structured entities		837		3,939		5,993

Non-controlling interests

Subsidiaries of which non-controlling interests are significant to the Group’s consolidated financial statements are as follows (Unit: Korean Won in millions):

1) Accumulated non-controlling interests at the end of the period

	December 31, 2016		December 31, 2017
Woori Investment Bank		73,986		119,111
PT Bank Woori Saudara Indonesia 1906 Tbk		70,249		64,877
Wealth Development Bank		16,983		16,778

2) Net income attributable to non-controlling interests

	For the year ended December 31, 2015		For the year ended December 31, 2016		For the year ended December 31, 2017
Woori Investment Bank		4,353		9,990		8,370
PT Bank Woori Saudara Indonesia 1906 Tbk		6,241		6,383		8,882
Wealth Development Bank		—		611		648

3) Dividends to non-controlling interests

	For the year ended December 31, 2015		For the year ended December 31, 2016		For the year ended December 31, 2017
PT Bank Woori Saudara Indonesia 1906 Tbk		778		1,242		1,513

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Significant Basis of Preparation and Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting policies [Abstract]

K-IFRS 1109 estimated impact of adopting K-IFRS 1109

The estimated impact on the classification and measurement of Group’s financial assets (except derivatives) as of year-end is presented as follows. The following information is constructed from the accounting system for financial instruments built for the purpose of adopting IFRS 9.

(Unit : Korean Won in millions)

Classification per IAS 39	Classification per IFRS 9	Carrying Amount per IAS 39		Carrying Amount per IFRS 9
Loans and receivables (Deposits)	Amortized cost		8,870,835		8,870,835
Financial assets at FVTPL (Deposits)	FVTPL		25,972		25,972
Financial assets at FVTPL (Debt securities)	FVTPL		2,654,027		2,654,027
AFS financial assets (Debt securities)	FVTPL		46,855		46,855
AFS financial assets (Debt securities)	FVTOCI		12,874,209		12,874,209
AFS financial assets (Debt securities)	Amortized cost		308,181		322,300
Held-to-maturity financial assets (Debt securities)	Amortized cost		16,749,296		16,749,296
Financial assets at FVTPL (Equity securities)	FVTPL		47,304		47,304
AFS financial assets (Equity securities)	FVTPL		1,273,498		1,274,716
AFS financial assets (Equity securities)	FVTOCI		850,207		850,207
Loans and receivables (Loans)	FVTPL		279,032		280,001
Loans and receivables (Loans)	Amortized cost		253,014,491		253,014,491
Loans and receivables (Other financial assets)	Amortized cost		6,772,088		6,772,088
Total financial assets except derivatives			303,765,995		303,782,301

K-IFRS 1109 Expected Impact on the allowance for credit losses of adopting K-IFRS 1109

The expected impact on the allowance for credit losses as of year-end using the Group’s system for allowances is as follows.

(Unit : Korean Won in millions)

	Allowance for credit losses per IAS 39 (A)		Allowance for credit losses per IFRS 9 (B)		Increases(B-A)
Deposits		2,458		3,092		634
Debt securities		—		9,331		9,331
AFS debt securities		—		4,253		4,253
Held-to-maturity debt securities		—		5,078		5,078
Loan receivables and other financial assets		1,827,785		2,075,752		247,967
Guarantees		183,247		192,376		9,129
Loan commitments		66,115		104,887		38,772
Total		2,079,605		2,385,438		305,833

Estimated economic useful lives for premises and equipment except for land

While land is not depreciated, for all other premises and equipment, depreciation is charged to net income on a straight-line basis on the estimated economic useful lives as follows:

	Useful life
Buildings used for business purpose	35 to 57 years
Structures in leased office	4 to 5 years
Properties for business purpose	4 to 5 years
Leased assets	Useful lives of the same kind or similar other premises and equipment

Estimated useful life for intangible assets

Intangible assets are stated at the manufacturing cost or acquisition cost plus additional incidental expenses less accumulated amortization and accumulated impairment losses. The Group’s intangible assets are amortized on a straight-line basis on the estimated economic useful lives as follows. The estimated useful life and amortization method are reviewed at the end of each reporting period. If expectations differ from previous estimates, the changes are accounted for as a change in an accounting estimate.

	Useful life
Patents	10 years
Development costs	5 years
Software and others	4 to 5 years

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Risk Management (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of risk management [Abstract]

Maximum exposure to credit risk

The maximum exposure to credit risk is as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Loans and receivables:
Korean treasury and government agencies		16,058,305		8,823,584
Banks		20,242,260		26,845,309
Corporates		88,985,566		90,570,551
Consumers		133,106,502		140,866,760
Sub-total		258,392,633		267,106,204
Financial assets at fair value through profit or loss (“FVTPL”):
Deposits indexed to gold prices		26,180		25,972
Debt securities held for trading		2,644,916		2,644,333
Designated at FVTPL		4,348		9,694
Derivative assets for trading		2,898,295		3,115,775
Sub-total		5,573,739		5,795,774
Available-for-sale (“AFS”) debt securities		16,541,888		13,229,244
Held-to-maturity (“HTM”) securities		13,910,251		16,749,296
Derivative assets for hedging		140,577		59,272
Off-balance sheet items:
Guarantees		14,761,784		12,859,715
Loan commitments		83,795,496		80,760,325
Sub-total		98,557,280		93,620,040
Total		393,116,368		396,559,830

Credit risk exposure by geographical areas [Table Text Block]

a) Credit risk exposure by geographical areas

The following tables analyze credit risk exposure by geographical areas (Unit: Korean Won in millions):

	December 31, 2016
	Korea		China		USA		UK		Japan		Others(*)		Total
Loans and receivables		241,380,250		4,286,018		2,792,088		895,874		323,470		8,714,933		258,392,633
Financial assets at FVTPL		5,205,849		6,525		—		261,547		81		99,737		5,573,739
AFS debt securities		16,155,290		13,845		137,861		—		—		234,892		16,541,888
HTM securities		13,758,863		—		20,336		—		—		131,052		13,910,251
Derivative assets for hedging		74,166		—		—		66,342		—		69		140,577
Off-balance sheet items		96,245,092		737,513		103,130		80,831		23,250		1,367,464		98,557,280
Total		372,819,510		5,043,901		3,053,415		1,304,594		346,801		10,548,147		393,116,368

	December 31, 2017
	Korea		China		USA		UK		Japan		Others(*)		Total
Loans and receivables		250,678,479		4,104,912		2,823,247		1,094,988		381,890		8,022,688		267,106,204
Financial assets at FVTPL		5,551,870		2,937		—		148,955		—		92,012		5,795,774
AFS debt securities		12,407,602		52,259		151,131		—		—		618,252		13,229,244
HTM securities		16,606,692		—		63,732		—		—		78,872		16,749,296
Derivative assets for hedging		16,590		—		—		42,682		—		—		59,272
Off-balance sheet items		91,603,852		529,193		172,570		66,974		25,039		1,222,412		93,620,040
Total		376,865,085		4,689,301		3,210,680		1,353,599		406,929		10,034,236		396,559,830

(*) Others consist of financial assets in Indonesia, Vietnam, Panama and the European countries and others.

Credit risk exposure by industries [Table Text Block]

b) Credit risk exposure by industries

The following tables analyze credit risk exposure by industries, which are service, manufacturing, finance and insurance, construction, individuals and others in accordance with the Korea Standard Industrial Classification Code (Unit: Korean Won in millions):

	December 31, 2016
	Service		Manufacturing		Finance and insurance		Construction		Individuals		Others		Total
Loans and receivables		46,040,278		35,652,974		37,711,983		3,789,670		125,558,637		9,639,091		258,392,633
Financial assets at FVTPL		77,198		360,881		4,093,567		24,140		993		1,016,960		5,573,739
AFS debt securities		1,092,279		57,781		9,568,151		63,166		—		5,760,511		16,541,888
HTM securities		1,673,971		—		8,290,451		251,599		—		3,694,230		13,910,251
Derivative assets for hedging		—		—		140,577		—		—		—		140,577
Off-balance sheet items		18,423,611		26,878,320		9,927,574		4,621,971		33,603,651		5,102,153		98,557,280
Total		67,307,337		62,949,956		69,732,303		8,750,546		159,163,281		25,212,945		393,116,368

	December 31, 2017
	Service		Manufacturing		Finance and insurance		Construction		Individuals		Others		Total
Loans and receivables		47,192,641		34,502,509		38,260,051		3,574,746		133,094,287		10,481,970		267,106,204
Financial assets at FVTPL		100,766		83,239		4,640,068		15,073		1,040		955,588		5,795,774
AFS debt securities		707,737		37,719		7,331,774		153,534		—		4,998,480		13,229,244
HTM securities		1,348,754		—		10,962,149		296,214		—		4,142,179		16,749,296
Derivative assets for hedging		—		—		59,272		—		—		—		59,272
Off-balance sheet items		16,892,926		21,427,378		9,841,379		3,842,479		36,928,554		4,687,324		93,620,040
Total		66,242,824		56,050,845		71,094,693		7,882,046		170,023,881		25,265,541		396,559,830

Schedule of loan portfolio [Table Text Block]

3) Credit risk of loans and receivables

The credit exposure of loans and receivables by customer and loan classification are as follows (Unit: Korean Won in millions):

	December 31, 2016
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Loans and receivables neither overdue nor impaired		16,062,399		20,258,860		49,815,352		31,520,617		7,142,440		88,478,409		132,195,005		256,994,673
Loans and receivables overdue but not impaired		—		—		48,294		57,245		—		105,539		765,829		871,368
Impaired loans and receivables		—		—		1,404,568		429,955		208,372		2,042,895		510,793		2,553,688
Gross loans and receivables		16,062,399		20,258,860		51,268,214		32,007,817		7,350,812		90,626,843		133,471,627		260,419,729
Allowance for credit losses		4,094		16,600		1,156,000		424,142		61,135		1,641,277		365,125		2,027,096
Total, net		16,058,305		20,242,260		50,112,214		31,583,675		7,289,677		88,985,566		133,106,502		258,392,633

	December 31, 2017
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Loans and receivables neither overdue nor impaired		8,825,767		26,861,286		50,463,112		34,107,547		5,547,950		90,118,609		139,886,407		265,692,069
Loans and receivables overdue but not impaired		8		—		65,616		63,067		—		128,683		878,406		1,007,097
Impaired loans and receivables		—		—		1,402,131		251,431		46,717		1,700,279		537,001		2,237,280
Gross loans and receivables		8,825,775		26,861,286		51,930,859		34,422,045		5,594,667		91,947,571		141,301,814		268,936,446
Allowance for credit losses		2,191		15,977		1,078,733		267,162		31,125		1,377,020		435,054		1,830,242
Total, net		8,823,584		26,845,309		50,852,126		34,154,883		5,563,542		90,570,551		140,866,760		267,106,204

Analysis of credit quality of neither past due nor impaired loans and receivables using internal credit grading system [Table Text Block]

a) Credit quality of loans and receivables

The Group manages credit quality of its loans and receivables, (neither overdue nor impaired, net of allowance) through an internal rating system. Segregation of credit quality is as follows (Unit: Korean Won in millions):

	December 31, 2016
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Upper grade(*1)		16,058,288		20,242,260		41,461,420		18,755,963		5,337,033		65,554,416		128,374,017		230,228,981
Lower grade(*2)		17		—		7,941,871		12,550,282		1,763,658		22,255,811		3,680,920		25,936,748
Total		16,058,305		20,242,260		49,403,291		31,306,245		7,100,691		87,810,227		132,054,937		256,165,729
Value of collateral(*3)		—		358,456		18,003,674		25,493,006		3,996,162		47,492,842		111,054,910		158,906,208
	December 31, 2017
					Corporates
	Korean treasury and government agencies		Banks		General business		Small and medium sized enterprise		Project financing and others		Sub-total		Consumers		Total
Upper grade(*1)		8,823,576		26,845,309		43,613,460		23,191,627		4,623,750		71,428,837		135,893,496		242,991,218
Lower grade(*2)		—		—		6,565,274		10,767,062		898,536		18,230,872		3,835,030		22,065,902
Total		8,823,576		26,845,309		50,178,734		33,958,689		5,522,286		89,659,709		139,728,526		265,057,120
Value of collateral(*3)		1,409		483,469		19,868,185		29,600,362		2,642,674		52,111,221		114,441,637		167,037,736

(*1) AAA~BBB for Corporates, and 1~6 level for Consumers

(*2) BBB- ~C for Corporates, and 7~10 level for Consumers

(*3) The value of collateral held is the recoverable amount when calculating the allowance for credit losses.

The total amount in the above table are net of allowances for credit losses, for loans and receivables neither overdue nor impaired, amounting to 828,944 million Won and 634,949 million Won as of December 31, 2016 and 2017, respectively.

Aging analysis of loans and receivables pastdue but not impaired net of allowance

b) Aging analysis of loans and receivables

Aging analysis of loans and receivables (overdue but not impaired, net of allowance) is as follows (Unit: Korean Won in millions):

	December 31, 2016
Past due	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Less than 30 days		—		—		45,255		41,329		—		86,584		584,995		671,579
30 to 59 days		—		—		1,553		8,933		—		10,486		90,296		100,782
60 to 89 days		—		—		337		2,123		—		2,460		49,151		51,611
Total		—		—		47,145		52,385		—		99,530		724,442		823,972
Value of collateral(*)		—		—		7,021		45,304		—		52,325		546,164		598,489

	December 31, 2017
Past due	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Less than 30 days		8		—		59,560		48,002		—		107,562		683,445		791,015
30 to 59 days		—		—		3,702		6,550		—		10,252		94,376		104,628
60 to 89 days		—		—		928		4,935		—		5,863		55,011		60,874
Total		8		—		64,190		59,487		—		123,677		832,832		956,517
Value of collateral(*)		—		—		4,619		46,513		—		51,132		619,867		670,999

(*) The value of collateral held is the recoverable amount used when calculating allowance for credit losses.

The total amounts in the above table are net of allowances for credit losses, for loans and receivables that are overdue but not impaired, amounting to 47,396 million Won and 50,580 million Won as of December 31, 2016 and 2017, respectively.

Aging analysis of loans and receivables pastdue and impaired net of allowance

c) Impaired loans and receivables

Impaired loans and receivables, net of allowance are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Impaired loans		—		—		661,778		225,045		188,986		1,075,809		327,123		1,402,932
Value of collateral(*)		—		—		482,680		236,954		42,166		761,800		250,583		1,012,383

	December 31, 2017
	Korean treasury and government agencies		Banks		Corporates								Consumers		Total
					General business		Small & medium sized enterprise		Project financing and others		Sub-total
Impaired loans		—		—		609,202		136,707		41,256		787,165		305,402		1,092,567
Value of collateral(*)		—		—		562,638		141,026		20,351		724,015		227,966		951,981

(*) The value of collateral held is the recoverable amount used when calculating allowance for credit losses.

The total amounts in the above table are net of allowances for credit losses, for impaired loans and receivables amounting to 1,150,756 million Won and 1,144,713 million Won as of December 31, 2016 and 2017, respectively.

Credit quality indicators related to securities [Table Text Block]

4) Credit risk of debt securities

The Group manages debt securities based on the credit rating. Credit soundness of debt securities on the basis of External Credit Assessment Institution (“ECAI”), Korea’s qualified external rating agency, is as follows (Unit: Korean Won in millions):

	December 31, 2016
	Financial assets at FVTPL(*)		AFS debt securities		HTM securities		Total
AAA		1,658,332		12,490,934		13,342,384		27,491,650
AA- ~ AA+		720,535		3,372,310		466,401		4,559,246
BBB- ~ A+		266,049		618,736		101,466		986,251
Below BBB-		4,348		59,908		—		64,256
Total		2,649,264		16,541,888		13,910,251		33,101,403

	December 31, 2017
	Financial assets at FVTPL(*)		AFS debt securities		HTM securities		Total
AAA		1,685,099		9,897,689		15,806,327		27,389,115
AA- ~ AA+		722,923		2,386,567		888,547		3,998,037
BBB- ~ A+		236,311		876,482		52,188		1,164,981
Below BBB-		9,694		68,506		2,234		80,434
Total		2,654,027		13,229,244		16,749,296		32,632,567

(*) Financial assets at FVTPL comprise debt securities held for trading and financial assets designated at FVTPL.

Schedule of va r by subsidiary [Table Text Block]

a) Trading activities

The minimum, maximum and average VaR for the year ended December 31, 2016 and 2017, respectively, and the VaR as of December 31, 2016 and 2017, respectively, are as follows (Unit: Korean Won in millions):

	As of December 31, 2016			For the year ended December 31, 2016									As of December 31, 2017			For the year ended December 31, 2017
Risk factor				Average			Maximum			Minimum						Average			Maximum			Minimum
Interest rate		3,250			2,844			6,430			1,367			4,183			3,799			4,918			2,467
Stock price		4,191			3,456			5,063			2,304			909			2,863			4,419			909
Foreign currencies		4,396			4,914			7,686			3,967			4,750			5,051			6,636			4,061
Commodity price		152			113			325			21			—			31			188			—
Diversification		(5,630	)		(5,355	)		(10,385	)		(4,034	)		(4,472	)		(4,621	)		(6,798	)		(2,067	)
Total VaR(*)		6,359			5,972			9,119			3,625			5,370			7,123			9,363			5,370

(*) VaR= Value at Risk

Net interest income and net portfolio value analysis according to interest changing scenario for assets and liabilities held by the bank [Table Text Block]

b) Non-trading activities

The NII and NPV are calculated for the assets and liabilities owned by the Bank, respectively, by using the simulation method. The scenario responding to interest rate (“IR”) changes are as follows (Unit: Korean Won in millions):

Name of scenario	December 31, 2016				December 31, 2017
	NII(*1)		NPV(*2)		NII(*1)		NPV(*2)
Base case		4,367,411		21,556,632		4,916,138		23,472,792
Base case (Prepay)		4,384,783		20,666,425		4,916,015		23,163,942
IR 100bp up		4,802,118		20,893,490		5,361,546		22,886,122
IR 100bp down		3,903,129		22,279,204		4,386,437		24,127,559
IR 200bp up		5,236,879		20,289,742		5,806,723		22,372,208
IR 200bp down		2,975,351		23,052,848		3,452,590		24,830,482
IR 300bp up		5,671,639		19,742,627		6,251,897		21,929,189
IR 300bp down		1,968,273		25,096,193		2,254,609		26,633,807

(*1) Net Interest Income

(*2) Net Portfolio Value

Interest earning at risk and interest value at risk based on bis framework for subsidiaries other than bank [Table Text Block]

The interest EaR and VaR are calculated based on the BIS Framework of other subsidiaries excluding the Bank are as follows (Unit: Korean Won in millions):

December 31, 2016		December 31, 2017
EaR	VaR	EaR	VaR
188,381	110,335	255,679	130,821

Cash flows of principal amounts and interests from interest bearing assets and liabilities by re-pricing date [Table Text Block]

The Group estimates and manages risks related to changes in interest rate due to the difference in the maturities of interest-bearing assets and the liabilities and discrepancies in the terms of interest rate. Cash flows of principal amounts and interests from interest bearing assets and liabilities by re-pricing date are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Within 3 months		4 to 6 months		7 to 9 months		10 to12 months		1 to 5 years		Over 5 years		Total
Asset:
Loans and receivables		148,237,350		42,032,667		8,064,502		7,757,087		55,838,192		35,245,734		297,175,532
AFS financial assets		3,165,094		2,946,992		2,854,514		2,915,226		5,029,918		713,596		17,625,340
HTM financial assets		2,770,079		1,515,213		1,246,503		1,143,170		6,853,951		892,030		14,420,946
Total		154,172,523		46,494,872		12,165,519		11,815,483		67,722,061		36,851,360		329,221,818
Liability:
Deposits due to customers		100,051,821		36,614,529		25,028,378		25,017,836		34,513,004		40,737		221,266,305
Borrowings		13,772,710		1,044,748		491,330		368,431		2,816,565		421,677		18,915,461
Debentures		2,109,235		2,077,681		860,455		1,545,943		14,613,799		4,143,773		25,350,886
Total		115,933,766		39,736,958		26,380,163		26,932,210		51,943,368		4,606,187		265,532,652

	December 31, 2017
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Asset:
Loans and receivables		161,653,892		41,671,530		7,614,159		6,411,841		54,150,998		26,272,958		297,775,378
AFS financial assets		2,150,708		2,500,103		2,016,711		2,367,762		4,229,000		601,735		13,866,019
HTM financial assets		2,286,179		2,161,467		1,433,425		1,687,362		9,369,794		345,868		17,284,095
Total		166,090,779		46,333,100		11,064,295		10,466,965		67,749,792		27,220,561		328,925,492
Liability:
Deposits due to customers		106,815,564		37,750,367		25,117,556		27,585,458		37,518,878		91,246		234,879,069
Borrowings		9,865,249		1,056,579		412,966		437,431		2,709,010		479,827		14,961,062
Debentures		1,955,902		2,452,240		1,018,563		1,752,847		19,770,538		2,869,766		29,819,856
Total		118,636,715		41,259,186		26,549,085		29,775,736		59,998,426		3,440,839		279,659,987

Foreign currency risk exposure of financial instruments in foreign currency

3) Currency risk

Currency risk arises from monetary financial instruments denominated in foreign currencies other than the functional currency. Therefore, no currency risk arises from non-monetary items or financial instruments denominated in the functional currency.

Financial instruments in foreign currencies exposed to currency risk are as follows (Unit: USD in millions, JPY in millions, CNY in millions, EUR in millions, and Korean Won in millions):

	December 31, 2016
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Asset:
Loans and receivables		22,868		27,635,970		108,944		1,129,539		23,194		4,018,678		1,548		1,962,856		4,382,990		39,130,033
Financial assets at FVTPL		66		79,386		57		589		—		—		30		37,562		34,124		151,661
AFS financial assets		898		1,085,108		—		—		80		13,844		—		570		144,799		1,244,321
HTM financial assets		17		20,517		—		—		—		—		—		—		143,535		164,052
Total		23,849		28,820,981		109,001		1,130,128		23,274		4,032,522		1,578		2,000,988		4,705,448		40,690,067
	December 31, 2016
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Liability:
Financial liabilities at FVTPL		75		90,908		253		2,621		—		—		88		111,098		115,980		320,607
Deposits due to customers		11,294		13,648,729		124,790		1,293,835		18,950		3,283,291		651		825,165		2,402,076		21,453,096
Borrowings		7,193		8,692,792		3,243		33,625		—		—		222		280,894		115,332		9,122,643
Debentures		2,931		3,541,769		—		—		700		121,282		—		—		228,720		3,891,771
Other financial liabilities		2,235		2,700,703		12,390		128,464		1,508		261,278		245		310,396		846,990		4,247,831
Total		23,728		28,674,901		140,676		1,458,545		21,158		3,665,851		1,206		1,527,553		3,709,098		39,035,948
Off-balance accounts		8,593		10,384,163		28,675		297,304		1,061		183,883		374		473,845		312,187		11,651,382
	December 31, 2017
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Asset:
Loans and receivables		23,000		24,642,900		126,944		1,204,843		25,224		4,127,936		1,156		1,479,351		3,937,733		35,392,763
Financial assets at FVTPL		32		34,303		25		238		—		—		27		34,583		104,892		174,016
AFS financial assets		1,966		2,105,972		—		—		319		52,259		—		590		302,801		2,461,622
HTM financial assets		111		118,868		—		—		—		—		—		—		78,175		197,043
Total		25,109		26,902,043		126,969		1,205,081		25,543		4,180,195		1,183		1,514,524		4,423,601		38,225,444
	December 31, 2017
	USD				JPY				CNY				EUR				Others		Total
	Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Foreign currency		Won equivalent		Won equivalent		Won equivalent
Liability:
Financial liabilities at FVTPL		41		43,423		79		752		—		—		19		24,878		69,977		139,030
Deposits due to customers		13,744		14,725,686		195,176		1,852,440		21,865		3,578,142		883		1,129,802		2,396,826		23,682,896
Borrowings		6,604		7,080,118		2,218		21,056		—		—		247		315,685		242,874		7,659,733
Debentures		3,467		3,714,411		—		—		700		114,555		—		—		375,749		4,204,715
Other financial liabilities		2,392		2,562,740		16,125		153,043		1,802		294,950		129		165,189		588,625		3,764,547
Total		26,248		28,126,378		213,598		2,027,291		24,367		3,987,647		1,278		1,635,554		3,674,051		39,450,921
Off-balance accounts		8,108		8,687,009		33,624		319,127		1,199		196,261		406		519,843		176,886		9,899,126

Cash flow from principal and interest payments of non derivative financial liabilities by remaining contractual maturities [Table Text Block]

a) Cash flows of principals and interests by remaining contractual maturities of non-derivative financial liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		678,813		1,529		94		47		154,325		—		834,808
Deposits due to customers		136,835,315		28,685,473		19,254,108		30,875,962		6,284,092		2,732,019		224,666,969
Borrowings		9,146,895		2,355,336		876,836		1,486,710		4,711,273		420,720		18,997,770
Debentures		2,108,780		2,077,387		860,596		1,518,524		14,641,016		4,116,768		25,323,071
Other financial liabilities		14,813,948		27,544		5,480		1,433		84,792		2,751,825		17,685,022
Total		163,583,751		33,147,269		20,997,114		33,882,676		25,875,498		10,021,332		287,507,640
	December 31, 2017
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		168,442		155,984		1,717		512		375		—		327,030
Deposits due to customers		148,008,777		29,563,310		18,175,348		32,468,110		7,409,118		2,624,594		238,249,257
Borrowings		6,115,732		1,893,173		1,489,272		1,178,107		3,924,681		479,568		15,080,533
Debentures		1,955,255		2,452,565		1,018,714		1,744,731		19,770,380		2,869,699		29,811,344
Other financial liabilities		7,121,342		162,871		825		1,003		128,940		2,730,001		10,144,982
Total		163,369,548		34,227,903		20,685,876		35,392,463		31,233,494		8,703,862		293,613,146

Cash flow from principal and interest payments of non derivative financial liabilities by estimated redemption or withdrawal [Table Text Block]

b) Cash flows of principals and interests of non-derivative financial liabilities by estimated redemption or withdrawal are as follows; (Unit: Korean Won in millions):

	December 31, 2016
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		678,813		1,529		94		47		154,325		—		834,808
Deposits due to customers		148,089,355		30,163,971		17,600,803		20,947,335		5,128,387		2,331,993		224,261,844
Borrowings		9,146,901		2,355,332		876,835		1,486,710		4,711,273		420,719		18,997,770
Debentures		2,108,780		2,077,387		860,596		1,518,524		14,641,016		4,116,768		25,323,071
Other financial liabilities		14,813,948		27,544		5,480		1,433		84,792		2,751,825		17,685,022
Total		174,837,797		34,625,763		19,343,808		23,954,049		24,719,793		9,621,305		287,102,515

	December 31, 2017
	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
Financial liabilities at FVTPL		168,442		155,984		1,717		512		375		—		327,030
Deposits due to customers		159,146,602		31,298,562		16,667,130		21,995,294		6,487,047		2,278,756		237,873,391
Borrowings		6,115,732		1,893,173		1,489,272		1,178,107		3,924,681		479,568		15,080,533
Debentures		1,955,255		2,452,565		1,018,714		1,744,731		19,770,380		2,869,699		29,811,344
Other financial liabilities		7,121,342		162,871		825		1,003		128,940		2,730,001		10,144,982
Total		174,507,373		35,963,155		19,177,658		24,919,647		30,311,423		8,358,024		293,237,280

Cash flow of derivative financial liabilities by maturities [Table Text Block]

The cash flow by the maturity of derivative financial liabilities as of December 31, 2016 and 2017 is as follows:

	Within 3 months		4 to 6 months		7 to 9 months		10 to 12 months		1 to 5 years		Over 5 years		Total
December 31, 2016		3,009,977		—		—		208		7,013		—		3,017,198
December 31, 2017		3,150,149		—		—		381		67,373		—		3,217,903

Maturity analysis of off balance accounts [Table Text Block]

4) Maturity analysis of off-balance accounts

The Group provides guarantees on behalf of customers. A financial guarantee represents an irrevocable undertaking that the Group will meet a customer’s obligations to third parties if the customer fails to do so. Under a loan commitment, the Group agrees to make funds available to a customer in the future. Loan commitments which are usually for a specified term may be unconditionally cancellable or may persist, provided all conditions in the loan facility are satisfied or waived. Commitments to lend include commercial standby facilities and credit lines, liquidity facilities to commercial paper conduits and utilized overdraft facilities. The maximum limit to be paid by the Group in accordance with guarantees and loan commitment only applies to principal amounts. There are contractual maturities for financial guarantees, such as guarantees for debentures issued or loans, loan commitments, and other guarantees, however, under the terms of the guarantees and loan commitments, funds should be paid upon demand from the counterparty. Details of off-balance accounts are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Guarantees		14,761,784		12,859,715
Loan commitments		83,795,496		80,760,325

Capital Ratio

(5) Capital management

The Group complies with the standard of capital adequacy provided by financial regulatory authorities. The capital adequacy ratio is based on Basel III of Basel Committee on Banking Supervision and Basel III was applied from the end of December, 2013. The capital adequacy ratio is calculated by dividing required capital by asset (weighted with a risk premium – risk weighted assets) based on the consolidated financial statements of the Group.

According to this regulation, the Group is required to meet the following new minimum requirements: 6.25% and 5.38% Common Equity Tier 1 capital ratio, 7.75% and 6.88% Tier 1 capital ratio and 9.75% and 8.88% total capital ratio as of December 31, 2017 and 2016, respectively. The details are as follows (Unit: Korean won in millions):

	December 31, 2016
Tier 1 capital		15,714,480
Other Tier 1 capital		3,275,496
Tier 2 capital		3,910,513
Total risk-adjusted capital		22,900,489
Risk-weighted assets for credit risk		138,018,500
Risk-weighted assets for market risk		2,277,809
Risk-weighted assets for operational risk		9,431,814
Total risk-weighted assets		149,728,123
Common Equity Tier 1 ratio		10.50	%
Tier 1 capital ratio		12.68	%
Total capital ratio		15.29	%

	December 31, 2017
Tier 1 capital		16,074,987
Other Tier 1 capital		3,041,664
Tier 2 capital		3,486,555
Total risk-adjusted capital		22,603,206
Risk-weighted assets for credit risk		134,767,711
Risk-weighted assets for market risk		2,316,938
Risk-weighted assets for operational risk		9,677,559
Total risk-weighted assets		146,762,208
Common Equity Tier 1 ratio		10.95	%
Tier 1 capital ratio		13.03	%
Total capital ratio		15.40	%

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Operating Segments (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of operating segments [Abstract]

Reconciliation of Operating Profit (Loss) from Segments to Consolidated

The details of operating income by each segment are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Consumer banking			Corporate banking			Investment banking			Capital market			Credit Card			Head- quarter and Others			Sub-total			Inter- segment transaction			Total
Net Interest income		1,289,088			1,699,913			5,601			40,913			378,019			743,092			4,156,626			605,274			4,761,900
Interest income		2,850,985			3,255,796			154,460			19,394			500,449			1,585,636			8,366,720			331,515			8,698,235
Interest expense		(1,227,921	)		(1,880,195	)		(18	)		(81	)		(122,430	)		(979,449	)		(4,210,094	)		273,759			(3,936,335	)
Inter-segment		(333,976	)		324,312			(148,841	)		21,600			—			136,905			—			—			—
Net non-interest income		554,957			513,686			115,111			18,015			98,034			279,437			1,579,240			(947,937	)		631,303
Non-interest income		886,057			503,321			489,659			5,760,567			871,486			3,245,543			11,756,633			(366,953	)		11,389,680
Non-interest expense		(353,032	)		(25,993	)		(374,548	)		(5,742,552	)		(773,452	)		(2,907,816	)		(10,177,393	)		(580,984	)		(10,758,377	)
Inter-segment		21,932			36,358			—			—			—			(58,290	)		—			—			—
Other expense		(1,790,292	)		(1,795,561	)		53,089			(44,187	)		(321,265	)		(470,592	)		(4,368,808	)		327,191			(4,041,617	)
Administrative expense		(1,782,234	)		(925,566	)		(14,933	)		(16,945	)		(124,362	)		(553,539	)		(3,417,579	)		267,192			(3,150,387	)
Impairment losses on credit loss and others		(8,058	)		(869,995	)		68,022			(27,242	)		(196,903	)		82,947			(951,229	)		59,999			(891,230	)
Operating income		53,753			418,038			173,801			14,741			154,788			551,937			1,367,058			(15,472	)		1,351,586
Non-operating income (expense)		(19,113	)		(2,189	)		43,728			197			(5,150	)		136,954			154,427			(54,067	)		100,360
Net income before income tax expense		34,640			415,849			217,529			14,938			149,638			688,891			1,521,485			(69,539	)		1,451,946
Income tax expense		(8,383	)		(98,886	)		(52,642	)		(3,615	)		(32,780	)		(136,891	)		(333,197	)		(43,357	)		(376,554	)
Net income		26,257			316,963			164,887			11,323			116,858			552,000			1,188,288			(112,896	)		1,075,392

	For the year ended December 31, 2016
	Consumer banking			Corporate banking			Investment banking			Capital market			Credit Card			Head- quarter and Others			Sub-total			Inter- segment transaction			Total
Net Interest income		1,484,233			1,741,140			14,613			48,826			428,095			713,678			4,430,585			588,959			5,019,544
Interest income		2,979,811			3,026,148			153,160			19,575			556,681			1,492,148			8,227,523			284,789			8,512,312
Interest expense		(1,023,290	)		(1,780,990	)		(225	)		(324	)		(128,586	)		(863,523	)		(3,796,938	)		304,170			(3,492,768	)
Inter-segment		(472,288	)		495,982			(138,322	)		29,575			—			85,053			—			—			—
Net non-interest income		557,410			550,194			160,885			4,033			79,713			302,800			1,655,035			(955,695	)		699,340
Non-interest income		923,810			535,514			605,026			7,590,087			986,147			4,563,280			15,203,864			(433,879	)		14,769,985
Non-interest expense		(405,912	)		(32,873	)		(444,141	)		(7,586,054	)		(906,434	)		(4,173,415	)		(13,548,829	)		(521,816	)		(14,070,645	)
Inter-segment		39,512			47,553			—			—			—			(87,065	)		—			—			—
Other expense		(1,875,579	)		(1,476,190	)		(110,863	)		(51,995	)		(364,137	)		(574,606	)		(4,453,370	)		308,692			(4,144,678	)
Administrative expense		(1,788,672	)		(966,878	)		(14,983	)		(17,964	)		(148,001	)		(793,978	)		(3,730,476	)		252,000			(3,478,476	)
Impairment losses on credit loss and others		(86,907	)		(509,312	)		(95,880	)		(34,031	)		(216,136	)		219,372			(722,894	)		56,692			(666,202	)
Operating income		166,064			815,144			64,635			864			143,671			441,872			1,632,250			(58,044	)		1,574,206
Non-operating income (expense)		(35,081	)		(1,619	)		46,559			(5,288	)		(1,504	)		55,291			58,358			(79,175	)		(20,817	)
Net income before income tax expense		130,983			813,525			111,194			(4,424	)		142,167			497,163			1,690,608			(137,219	)		1,553,389
Income tax expense		(31,698	)		(203,983	)		(26,909	)		1,071			(32,774	)		16,475			(277,818	)		1,962			(275,856	)
Net income		99,285			609,542			84,285			(3,353	)		109,393			513,638			1,412,790			(135,257	)		1,277,533

	For the year ended December 31, 2017
	Consumer banking			Corporate banking			Investment banking			Capital market			Credit Cards			Head- quarters and others			Sub-total			Inter- segment transaction			Total
Net Interest income		1,702,939			1,795,377			12,124			36,883			463,603			622,790			4,633,716			586,934			5,220,650
Interest income		3,149,625			2,964,813			148,500			18,834			599,550			1,360,734			8,242,056			308,631			8,550,687
Interest expense		(955,836	)		(1,681,652	)		(243	)		—			(135,947	)		(834,662	)		(3,608,340	)		278,303			(3,330,037	)
Inter-segment		(490,850	)		512,216			(136,133	)		18,049			—			96,718			—			—			—
Net non-interest income		649,950			571,336			152,168			69,671			73,537			389,004			1,905,666			(745,990	)		1,159,676
Non-interest income		802,387			680,778			366,523			9,548,399			1,163,575			2,683,407			15,245,069			(395,833	)		14,849,236
Non-interest expense		(253,961	)		(170,268	)		(214,355	)		(9,478,728	)		(1,090,038	)		(2,132,053	)		(13,339,403	)		(350,157	)		(13,689,560	)
Inter-segment		101,524			60,826			—			—			—			(162,350	)		—			—			—
Other income(expense)		(1,906,561	)		(1,149,288	)		(63,835	)		14,662			(398,652	)		(939,406	)		(4,443,080	)		219,496			(4,223,584	)
Administrative expense		(1,808,974	)		(832,429	)		(12,881	)		(16,567	)		(163,536	)		(954,238	)		(3,788,625	)		257,824			(3,530,801	)
Impairment losses due to credit loss and others		(97,587	)		(316,859	)		(50,954	)		31,229			(235,116	)		14,832			(654,455	)		(38,328	)		(692,783	)
Operating income		446,328			1,217,425			100,457			121,216			138,488			72,388			2,096,302			60,440			2,156,742
Non-operating income (expense)		(98,510	)		(3,153	)		39,350			—			(5,219	)		(112,734	)		(180,266	)		(26,970	)		(207,236	)
Net income before income tax expense		347,818			1,214,272			139,807			121,216			133,269			(40,346	)		1,916,036			33,470			1,949,506
Income tax expense		(84,172	)		(296,634	)		(33,834	)		(29,335	)		(32,055	)		63,396			(412,634	)		(6,784	)		(419,418	)
Net income		263,646			917,638			105,973			91,881			101,214			23,050			1,503,402			26,686			1,530,088

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Cash and cash equivalents (Tables)

12 Months Ended

Dec. 31, 2017

Cash and cash equivalents [Abstract]

Schedule of Cash and Cash Equivalents

(1) Details of cash and cash equivalents are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Cash		2,113,739		2,009,363
Foreign currencies		742,340		617,155
Demand deposits		4,238,956		3,423,355
Fixed deposits		496,289		858,413
Total		7,591,324		6,908,286

Schedule of Other Significant Noncash Transactions

(2) Significant transactions not involving cash inflows and outflows are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2016			2017
Changes in other comprehensive income (loss) due to valuation of AFS financial assets		12,586			(84,498	)
Changes in other comprehensive income (loss) of investment in associates		(7,937	)		612
Changes in other comprehensive income of foreign operations translation		28,712			(208,329	)
Changes in other comprehensive income related to valuation of cash flow hedging		10,371			777
Changes in other comprehensive income due to remeasurement of the net defined benefit liability		34,162			10,497
Changes in investments in associates due to equity swap and others		—			51,227
Changes in investments in associates due to accounts transfer		(156,708	)		(62,571	)
Changes in unpaid dividends of hybrid equity securities		5,187			(10,658	)

Liability adjustments from financing activities

(3) Adjustments of liabilities from financing activities in current year are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2017
	January 1, 2017		Issuances		Redemption			Not involving cash inflows and outflows								December 31, 2017
								Foreign Exchange			Variation of gains on valuation of hedged items			Others
Borrowings		18,769,515		9,057,999		(12,692,882	)		(350,429	)		—			503		14,784,706
Debentures		23,565,449		18,438,221		(13,620,520	)		(478,249	)		(39,373	)		4,123		27,869,651
Total		42,334,964		27,496,220		(26,313,402	)		(828,678	)		(39,373	)		4,626		42,654,357

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Financial Assets at Fair Value through Profit or Loss (Tables)

12 Months Ended

Dec. 31, 2017

Financial assets at fair value through profit or loss [Abstract]

Description of accounting policy for intangible assets and goodwill

(1) Financial assets at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Financial assets held for trading		5,633,724		5,820,787
Financial assets designated at FVTPL		17,000		22,290
Total		5,650,724		5,843,077

Disclosure of financial assets held for trading

(2) Financial assets held for trading are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Deposits:
Deposits indexed to gold prices		26,180		25,972
Securities:
Debt securities
Korean treasury and government agencies		519,337		540,438
Financial institutions		1,444,459		1,476,498
Corporates		681,120		627,397
Equity securities		35,983		21,666
Beneficiary certificates		23,891		13,041
Loaned securities		4,459		—
Sub-total		2,709,249		2,679,040
Derivatives instruments assets		2,898,295		3,115,775
Total		5,633,724		5,820,787

Disclosure of financial assets designated at fair value through profit or loss [Table Text Block]

(3) Financial assets designated at FVTPL as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Debt securities		4,348		9,694
Equity securities		12,652		12,596
Total		17,000		22,290

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Available for sale financial assets (Tables)

12 Months Ended

Dec. 31, 2017

Available-for-sale Financial Assets [Abstract]

Details of Available for sale financial assets

Details of AFS financial assets are as follows (Unit: Korean Won in millions):

	As of December 31, 2016
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Debt securities:
Korean treasury and government agencies		3,778,688		13,700		(3,758	)		3,788,630
Financial institutions		6,310,517		7,585		(3,904	)		6,314,198
Corporates		4,336,195		93,957		(20,966	)		4,409,186
Asset-backed securities		250,630		—		(1,427	)		249,203
Bond denominated in foreign currencies		1,226,893		1,076		(16,105	)		1,211,864
Other debt securities		73,360		1,871		(3	)		75,228
Sub-total		15,976,283		118,189		(46,163	)		16,048,309
Equity securities		1,034,299		420,038		(724	)		1,453,613
Beneficiary certificates		2,802,847		40,405		(21,170	)		2,822,082
Securities loaned		493,625		3,040		(3,086	)		493,579
Total		20,307,054		581,672		(71,143	)		20,817,583

	As of December 31, 2017
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Debt securities:
Korean treasury and government agencies		2,338,760		1,193		(9,386	)		2,330,567
Financial institutions		5,225,921		1,504		(10,159	)		5,217,266
Corporates		2,727,016		3,851		(5,635	)		2,725,232
Asset-backed securities		309,518		—		(1,337	)		308,181
Bond denominated in foreign currencies		2,449,954		3,100		(10,475	)		2,442,579
Other debt securities		35,154		21		(12	)		35,163
Sub-total		13,086,323		9,669		(37,004	)		13,058,988
Equity securities		982,393		430,921		(2,236	)		1,411,078
Beneficiary certificates		697,655		18,701		(3,728	)		712,628
Securities loaned		169,988		664		(396	)		170,256
Total		14,936,359		459,955		(43,364	)		15,352,950

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Held to maturity financial assets (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of held-to-maturity financial assets [Abstract]

Held-To-Maturity Financial Assets

9. HELD-TO-MATURITY FINANCIAL ASSETS

Details of HTM financial assets are as follows (Unit: Korean Won in millions):

	As of December 31, 2016
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Korean treasury and government agencies		3,754,356		26,366		(6,391	)		3,774,331
Financial institutions		5,168,487		9,236		(4,940	)		5,172,783
Corporates		4,823,356		58,176		(7,093	)		4,874,439
Bond denominated in foreign currencies		164,052		—		(428	)		163,624
Total		13,910,251		93,778		(18,852	)		13,985,177

	As of December 31, 2017
	Amortized cost		Unrealized gains		Unrealized losses			Fair value
Korean treasury and government agencies		3,994,857		6,944		(15,266	)		3,986,535
Financial institutions		7,245,426		2,923		(15,067	)		7,233,282
Corporates		5,311,970		12,367		(25,326	)		5,299,011
Bond denominated in foreign currencies		197,043		832		(1,024	)		196,851
Total		16,749,296		23,066		(56,683	)		16,715,679

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Loans and receivables (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Loans And Receivables [Abstract]

Schedule of loans and receivables [Table Text Block]

(1) Details of loans and receivables are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Due from banks		14,815,476		8,868,378
Loans		235,400,585		251,523,301
Other receivables		8,176,572		6,714,525
Total		258,392,633		267,106,204

Schedule of due from financial institutions [Table Text Block]

(2) Details of due from banks are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Due from banks in local currency:
Due from the Bank of Korea		11,395,162			6,246,496
Due from the depository banks		3			30,003
Due from non-monetary financial institutions		9,811			150
Due from the Korea Exchange		1,625			50,000
Others		73,283			97,365
Allowance for credit losses		(2,798	)		(1,541	)
Sub-total		11,477,086			6,422,473
Due from banks in foreign currencies:
Due from banks on demand		877,636			794,353
Due from banks on time		1,684,631			972,915
Others		778,418			679,554
Allowance for credit losses		(2,295	)		(917	)
Sub-total		3,338,390			2,445,905
Total		14,815,476			8,868,378

Restricted due from banks [Table Text Block]

(3) Details of restricted due from banks are as follows (Unit: Korean Won in millions):

Financial institution	Counterparty	December 31, 2016		Reason of restriction
Due from banks in local currency:
Due from the Bank of Korea	The Bank of Korea		11,395,162	Reserve deposits under BOK Act
Others	Samsung Investment & Securities Co., Ltd. and others		70,304	Reserve deposits of the futures, option and others
			11,465,466
Due from banks in foreign currencies:
Due from banks on demand	The Bank of Korea and others		854,612	Reserve deposits under BOK Act and others
Others	The People’s Bank of China and others		778,418	Reserve deposits and others
			1,633,030
			13,098,496

Financial institution	Counterparty	December 31, 2017		Reason of restriction
Due from banks in local currency:
Due from the Bank of Korea	The Bank of Korea		6,246,496	Reserve deposits under BOK Act
Others	the Korea Exchange and others		94,394	Central counter party KRW margin and others
			6,340,890
Due from banks in foreign currencies:
Due from banks on demand	The Bank of Korea and others		787,520	Reserve deposits under The BOK Act and others
Others	The People’s Bank of China and others		367,108	Reserve deposits and others
			1,154,628
			7,495,518

Schedule of loans [Table Text Block]

(4) Details of loans are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Loans in local currency		191,309,481			200,213,230
Loans in foreign currencies		14,101,839			13,147,888
Domestic banker’s letter of credit		3,754,030			2,516,907
Credit card accounts		6,673,765			6,827,295
Bills bought in foreign currencies		7,758,575			8,197,159
Bills bought in local currency		414,451			334,714
Factoring receivables		96,763			137,523
Advances for customers on guarantees		25,197			23,620
Privately placed bonds		328,405			362,319
Securitized loans		252,690			563,152
Call loans		2,985,077			3,003,455
Bonds purchased under resale agreements		8,854,753			16,859,064
Loan origination costs and fees		458,639			510,860
Others		251,635			607,325
Present value discount		(13,827	)		(10,988	)
Allowance for credit losses		(1,850,888	)		(1,770,222	)
Total		235,400,585			251,523,301

Schedule of other receivables [Table Text Block]

(5) Details of other receivables are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
CMA accounts		190,000			135,000
Receivables		5,417,676			4,459,318
Accrued income		1,080,489			1,026,273
Telex and telephone subscription rights and refundable deposits		1,019,577			984,620
Other debtors		639,945			166,877
Allowance for credit losses		(171,115	)		(57,563	)
Total		8,176,572			6,714,525

Changes in allowance for probable credit losses on loans and receivables

(6) Changes in allowance for probable credit losses on loans and receivables are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Consumers			Corporates			Credit card			Others			Total
Beginning balance		(326,435	)		(2,128,090	)		(129,117	)		(370,264	)		(2,953,906	)
Net provision		(103,166	)		(744,416	)		(180,563	)		(83,994	)		(1,112,139	)
Recoveries of written-off loans		(29,219	)		(198,089	)		(34,207	)		—			(261,515	)
Charge-off		240,541			1,139,102			198,077			592			1,578,312
Sales of loans and receivables		2,518			138,055			—			866			141,439
Unwinding effect		12,514			99,854			—			—			112,368
Others		(186	)		7,390			—			10,180			17,384
Ending balance		(203,433	)		(1,686,194	)		(145,810	)		(442,620	)		(2,478,057	)

	For the year ended December 31, 2016
	Consumers			Corporates			Credit card			Others			Total
Beginning balance		(203,433	)		(1,686,194	)		(145,810	)		(442,620	)		(2,478,057	)
Net provision		(73,356	)		(536,359	)		(207,730	)		(73,318	)		(890,763	)
Recoveries of written-off loans		(53,679	)		(192,183	)		(44,393	)		(19,233	)		(309,488	)
Charge-off		155,424			722,359			242,561			236,857			1,357,201
Sales of loans and receivables		2,055			113,177			—			91,800			207,032
Unwinding effect		10,319			66,901			—			—			77,220
Others		(1,188	)		13,457			—			(2,510	)		9,759
Ending balance		(163,858	)		(1,498,842	)		(155,372	)		(209,024	)		(2,027,096	)

	For the year ended December 31, 2017
	Consumers			Corporates			Credit card			Others			Total
Beginning balance		(163,858	)		(1,498,842	)		(155,372	)		(209,024	)		(2,027,096	)
Net provision		(131,275	)		(539,222	)		(203,968	)		12,192			(862,273	)
Recoveries of written-off loans		(45,060	)		(84,413	)		(51,366	)		(68	)		(180,907	)
Charge-off		142,099			453,249			228,640			63,181			887,169
Sales of loans and receivables		898			65,145			—			29,186			95,229
Unwinding effect		8,643			36,548			—			—			45,191
Others		908			211,729			1			(193	)		212,445
Ending balance		(187,645	)		(1,355,806	)		(182,065	)		(104,726	)		(1,830,242	)

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Fair value of financial assets and liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Fair Value Measurement [Abstract]

Schedule of fair value measurement of financial instruments [Table Text Block]

(2) Fair value hierarchy of financial assets and liabilities measured at fair value are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Level 1(*1)		Level 2(*1)		Level 3(*2)		Total
Financial assets:
Financial assets held for trading
Deposits		26,180		—		—		26,180
Debt securities		370,636		2,274,280		—		2,644,916
Equity securities		35,983		—		—		35,983
Beneficiary certificates		—		23,891		—		23,891
Loaned securities		4,459		—		—		4,459
Derivative instrument assets		3,233		2,871,909		23,153		2,898,295
Sub-total		440,491		5,170,080		23,153		5,633,724
Financial assets designed at FVTPL
Debt securities		—		—		4,348		4,348
Equity securities		—		—		12,652		12,652
Sub-total		—		—		17,000		17,000
AFS financial assets
Debt securities		2,288,917		13,759,392		—		16,048,309
Equity securities		428,678		—		1,024,935		1,453,613
Beneficiary certificates		—		2,291,571		530,511		2,822,082
Loaned securities		391,279		102,300		—		493,579
Sub-total		3,108,874		16,153,263		1,555,446		20,817,583
Derivative assets		—		140,478		99		140,577
Total		3,549,365		21,463,821		1,595,698		26,608,884
Financial liabilities:
Financial liabilities held for trading
Deposits		26,501		—		—		26,501
Derivative liabilities		1,750		2,974,703		33,524		3,009,977
Sub-total		28,251		2,974,703		33,524		3,036,478
Financial liabilities designated at FVTPL
Equity-linked securities		—		197		673,709		673,906
Debentures		—		92,974		—		92,974
Sub-total		—		93,171		673,709		766,880
Derivative liabilities		—		7,221		—		7,221
Total		28,251		3,075,095		707,233		3,810,579

	December 31, 2017
	Level 1(*1)		Level 2(*1)		Level 3(*2)		Total
Financial assets:
Financial assets held for trading
Deposits		25,972		—		—		25,972
Debt securities		405,942		2,238,391		—		2,644,333
Equity securities		21,666		—		—		21,666
Beneficiary certificates		—		13,041		—		13,041
Derivative assets		1,021		3,093,272		21,482		3,115,775
Sub-total		454,601		5,344,704		21,482		5,820,787
Financial assets designated at FVTPL
Debt securities		—		—		9,694		9,694
Equity securities		—		—		12,596		12,596
Sub-total		—		—		22,290		22,290
AFS financial assets
Debt securities		2,710,172		10,348,815		—		13,058,987
Equity securities		399,214		—		1,011,864		1,411,078
Beneficiary certificates		—		68,722		643,906		712,628
Securities loaned		69,778		100,478		—		170,256
Sub-total		3,179,164		10,518,015		1,655,770		15,352,949
Derivative assets		—		59,272		—		59,272
Total		3,633,765		15,921,991		1,699,542		21,255,298
Financial liabilities:
Financial liabilities held for trading
Deposits		25,964		—		—		25,964
Derivative liabilities		2,613		3,126,585		20,951		3,150,149
Securities sold		—		—		—		—
Sub-total		28,577		3,126,585		20,951		3,176,113
Financial liabilities designated at FVTPL
Equity-linked securities		—		—		160,057		160,057
Debentures		—		91,739		—		91,739
Sub-total		—		91,739		160,057		251,796
Derivative liabilities		—		67,754		—		67,754
Total		28,577		3,286,078		181,008		3,495,663

(*1) There was no transfers between level 1 and level 2 of financial assets and liabilities measured at fair value. The Group recognizes transfers between levels at the end of reporting period in which events have occurred or conditions have changed.

(*2) Certain AFS financial assets were measured at cost as of December 31, 2016 and 2017, that are amounting to 43,202 million Won and 37,092 million Won, respectively. These unquoted equity instruments mostly represent minority investments in special purpose entity vehicles such as asset securitization structures. They are measured at cost because (a) observable inputs of financial information to measure fair value was not available to obtain, or (b) there is a significant variance in likely estimated cash flows or (c) the probabilities for the various estimated cash flows could not be measured reliably. In addition, there were no indicators of impairments in these investments and the Group has no intention to dispose these investments in the foreseeable future.

Valuation techniques and inputs used in fair value measurement of financial instruments measured at fair value [Table Text Block]

Financial instruments are measured at fair value using a quoted market price in active markets. If there is no active market for a financial instrument, the Group determines the fair value using alternative assumptions and developing fair value measurement methods. Alternative assumptions and fair value measurement methods for each type of financial instruments are as follows:

	Fair value measurement methods	Input variables
Debt securities	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	Risk-free market rate, credit spread
Equity securities and Beneficiary certificates	Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.	Risk-free market rate, market risk premium, Beta, etc.
Derivatives	The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.	Risk-free market rate, forward rate, volatility, foreign exchange rate, stock prices, etc.
Equity-linked securities	The fair value of security linked to stock prices or derivatives is measured by the models such as DCF model, FDM, or Monte Carlo Simulation given the	Values of underlying assets, risk-free market rate, market rate, dividend and convenience yield, volatility, correlation
	natures of the securities or underlying assets.	coefficient, credit spread, and foreign exchange rate
Debentures	The fair value is measured by discounting the projected cash flows of a debenture by applying the market discount rate that is reflecting credit rating of the Group.	Risk-free market rate, forward rate

Schedule of significant unobservable inputs used in fair value measurement of financial assets and liabilities [Table Text Block]

Valuation methods of financial assets and liabilities measured at fair value and classified into Level 3 and significant but unobservable inputs are as follows:

	Fair value measurement technique	Input variable	Range	Impact of changes in significant unobservable inputs on fair value measurement
Derivative assets	Option valuation model and others	Correlation coefficient	0.900~0.980	Variation of fair value increases as correlation coefficient increases.
		Volatility of underlying asset	12.1%~28.1%	Variation of fair value increases as volatility increases.
Derivative liabilities	Option valuation model and others	Correlation coefficient	0.900~0.980	Variation of fair value increases as correlation coefficient increases.
		Volatility of underlying asset	12.1%~28.1%	Variation of fair value increases as volatility increases.
Equity linked securities	Monte Carlo Simulation and others	Correlation coefficient	0.363~0.694	Equity linked securities’ variation of fair value increases if both volatility and correlation coefficient increase. However when correlation coefficient decreases, despite the increase in volatility, the variation of fair value of equity linked securities may decrease.
		Volatility of underlying asset	6.8%~58.9%
Equity securities and Beneficiary certificates	External appraisal value and others	Expected growth rate	0.0%~1.0%	Fair value increases as expected growth rate increases.
		Volatility of real estate sale price	0%	Fair value increases as sale price Increases
		Discount rate of lease cash flow and others	8.31%~8.54%	Fair value increases as discount rate of lease cash flow decreases

Reconciliation of changes in financial assets and liabilities classified as level3 of fair value hierarchy [Table Text Block]

(3) Changes in financial assets and liabilities classified into level 3 are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	January 1, 2015		Net Income (loss)(*1)			Other comprehensive income (loss)			Purchases/ Issuances			Disposals/ Settlements			Transfer to or from level 3(*2)			December 31, 2015
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*5)		49,274		71,703			—			(8,166	)		(33,156	)		(979	)		78,676
Sub-total		49,274		71,703			—			(8,166	)		(33,156	)		(979	)		78,676
Financial assets designed at FVTPL
Equity-linked securities		6,066		—			—			—			(6,066	)		—			—
Debt securities		—		(14	)		—			1,000			—			—			986
Equity securities		10,567		1,042			—			—			—			—			11,609
Sub-total		16,633		1,028			—			1,000			(6,066	)		—			12,595
AFS financial assets
Equity securities(*3)		1,031,918		(57,373	)		105,290			105,930			(100,018	)		(92,379	)		993,368
Beneficiary certificates		355,694		3,905			(24,846	)		121,613			(79,296	)		—			377,070
Others		14,241		(7,064	)		1,370			—			(3,239	)		—			5,308
Sub-total		1,401,853		(60,532	)		81,814			227,543			(182,553	)		(92,379	)		1,375,746
Derivative assets		11,946		7,375			—			—			(13,348	)		—			5,973
Total		1,479,706		19,574			81,814			220,377			(235,123	)		(93,358	)		1,472,990
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*5)		41,711		58,565			—			4,008			(24,475	)		(1,202	)-		78,607
Financial liabilities designated at FVTPL
Equity-linked securities(*4)		361,993		(73,533	)		—			764,005			(304,917	)		(197	)		747,351
Total		403,704		(14,968	)		—			768,013			(329,392	)		(1,399	)		825,958

	For the year ended December 31, 2016
	January 1, 2016		Net Income (loss)(*1)			Other comprehensive income (loss)			Purchases/ Issuances		Disposals/ Settlements			Transfer to or from level 3(*2)			December 31, 2016
Financial assets:
Financial assets held for trading
Derivative instrument assets(*6)		78,676		(29,117	)		—			13,640		(39,506	)		(540	)		23,153
Financial assets designed at FVTPL
Debt securities		986		(161	)		—			4,509		(986	)		—			4,348
Equity securities		11,609		1,043			—			—		—			—			12,652
Sub-total		12,595		882			—			4,509		(986	)		—			17,000
AFS financial assets
Equity securities(*3)		993,368		(6,986	)		57,323			205,749		(205,348	)		(19,171	)		1,024,935
Beneficiary certificates		377,070		(868	)		5,794			174,024		(25,509	)		—			530,511
Others		5,308		594			(643	)		—		(5,259	)		—			—
Sub-total		1,375,746		(7,260	)		62,474			379,773		(236,116	)		(19,171	)		1,555,446
Derivative assets		5,973		3,877			—			—		(9,751	)		—			99
Total		1,472,990		(31,618	)		62,474			397,922		(286,359	)		(19,711	)		1,595,698
Financial liabilities:
Financial liabilities held for trading Derivative liabilities		78,607		(8,322	)		—			1,155		(37,916	)		—			33,524
Financial liabilities designated at FVTPL
Equity-linked securities		747,351		71,079			—			—		(144,721	)		—			673,709
Total		825,958		62,757			—			1,155		(182,637	)		—			707,233

	For the year ended December 31, 2017
	January 1, 2017		Net Income (loss)(*1)			Other comprehensive income			Purchases/ Issuances		Disposals/ Settlements			Transfer to or out of level 3(*2)		December 31, 2017
Financial assets:
Financial assets held for trading
Derivative assets		23,153		22,362			—			1,398		(25,431	)		—		21,482
Financial assets designated at FVTPL
Debt securities		4,348		346			—			5,000		—			—		9,694
Equity securities		12,652		(56	)		—			—		—			—		12,596
Sub-total		17,000		290			—			5,000		—			—		22,290
AFS financial assets
Equity securities		1,024,935		27,986			24,442			65,961		(131,460	)		—		1,011,864
Beneficiary certificates		530,511		212			(4,321	)		226,975		(109,471	)		—		643,906
Sub-total		1,555,446		28,198			20,121			292,936		(240,931	)		—		1,655,770
Derivative assets		99		329			—			—		(428	)		—		—
Total		1,595,698		51,179			20,121			299,334		(266,790	)		—		1,699,542
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities		33,524		24,866			—			500		(37,939	)		—		20,951
Financial liabilities designated at FVTPL
Equity-linked securities		673,709		112,015			—			—		(625,667	)		—		160,057
Total		707,233		136,881			—			500		(663,606	)		—		181,008

(*1) From financial assets and liabilities classified as Level 3 that the Group holds as at the end of the year, losses of 2,854 million Won, 94,238 million Won and 34,621 million Won for the year ended December 31 2015, 2016 and 2017, respectively, were recognized in net gain (loss) on financial instruments at FVTPL and net gain (loss) on AFS financial assets in the comprehensive income statements.

(*2) The Group recognizes transfers between levels at the end of reporting period within which events have occurred or conditions have changed.

(*3) AFS financial assets were transferred out of level 1 to level 3 upon the change of the fair value measurement method of the assets by using market the external valuation specialists from previously using quoted prices in the active market, in the opposite case, they were transferred out of level 3 to level 1.

(*4) Since the observable market data for equity-linked securities was available, such securities were transferred out of Level 3 into Level 2.

(*5) As the variables used for the valuation of interest rate and equity related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.

(*6) As the variables used for the valuation of currency related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.

Schedule of sensitivity analysis dueto one or more unobservable inputs on fair value of level3 financial instruments [Table Text Block]

The following table shows the sensitivity analysis to disclose the effect of reasonably possible volatility on the fair value of a level 3 financial instruments for the years ended December 31, 2015, 2016 and 2017. (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Net income (loss)					Other comprehensive income (loss)
	Favorable		Unfavorable			Favorable		Unfavorable
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*1)(*2)		10,674		(9,729	)		—		—
Financial assets designed at FVTPL
Equity securities(*6)		793		(739	)		—		—
AFS Financial Assets
Equity securities(*3)(*4)		—		—			37,648		(20,869	)
Beneficiary certificates(*4)		—		—			4,102		(3,875	)
Others(*5)		—		—			80		(80	)
Total		11,467		(10,468	)		41,830		(24,824	)
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*1)(*2)		13,469		(12,281	)		—		—
Financial liabilities designated at FVTPL
Equity-linked securities(*1)		2,289		(2,247	)		—		—
Total		15,758		(14,528	)		—		—

	For the year ended December 31, 2016
	Net income (loss)					Other comprehensive income (loss)
	Favorable		Unfavorable			Favorable		Unfavorable
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*1)(*2)		861		(2,248	)		—		—
Financial assets designed at FVTPL
Debt securities(*6)		19		(18	)		—		—
Equity securities(*6)		688		(639	)		—		—
AFS Financial Assets
Equity securities(*3)(*4)		—		—			31,412		(18,551	)
Beneficiary certificates(*4)		—		—			2,903		(2,571	)
Total		1,568		(2,905	)		34,315		(21,122	)
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*1)(*2)		4,892		(3,568	)		—		—
Financial liabilities designated at FVTPL
Equity-linked securities(*1)		905		(857	)		—		—
Total		5,797		(4,425	)		—		—

	For the year ended December 31, 2017
	Net income (loss)					Other comprehensive income (loss)
	Favorable		Unfavorable			Favorable		Unfavorable
Financial assets:
Financial assets held for trading
Derivatives instruments assets(*1)(*2)		1,234		(526	)		—		—
Financial assets designed at FVTPL
Debt securities(*6)		265		(309	)		—		—
Equity securities(*6)		670		(624	)		—		—
AFS Financial Assets
Equity securities(*3)(*4)		—		—			28,583		(15,246	)
Beneficiary certificates(*4)		—		—			1,861		(1,857	)
Total		2,169		(1,459	)		30,444		(17,103	)
Financial liabilities:
Financial liabilities held for trading
Derivative liabilities(*1)(*2)		5		(513	)		—		—
Financial liabilities designated at FVTPL
Equity-linked securities(*1)		8		(7	)		—		—
Total		13		(520	)		—		—

(*1) Fair value changes of equity related derivatives assets and liabilities and equity-linked securities are calculated by increasing or decreasing historical volatility of the stock price and correlation, which are major unobservable variables, by 10%, respectively. In the case of interest rate related derivative assets and liabilities, fair value changes are calculated by increasing or decreasing the volatility of interest rate, which are major unobservable variables, by 10%, respectively.

(*2) Both derivative assets and liabilities for held for trading and hedging are included.

(*3) Fair value changes of equity securities are calculated by increasing or decreasing growth rate (0~1%) and discount rate or liquidation value (-1~1%) and discount rate. The growth rate, discount rate, and liquidation value are major unobservable variables.

(*4) Among the equity securities, whereas the sensitivity analysis of the capital contributions and beneficiary certificates is not possible in practice, fair value changes of such securities whose major unobservable variables are composed of the real estate are calculated by increasing or decreasing price fluctuation of real estate which is underlying assets and discount rate by 1%.

(*5) Fair value changes of other securities are calculated by increasing or decreasing price fluctuation of trust property or real estate which is underlying assets and discount rate by 1%. The prices of trust property and real estates and discount rate are major unobservable variables.

(*6) Fair value changes are measured by increasing or decreasing the discount rate by 10%, which is major unobservable variable, respectively.

Schedule of fair value measurement of financial instruments measured at amortised costs [Table Text Block]

(5) Fair value and carrying amount of financial assets and liabilities that are recorded at amortized cost are as follows (Unit: Korean Won in millions):

	As of December 31, 2016
	Fair value								Book value
	Level 1		Level 2		Level 3		Total
Financial assets:
Held-to-maturity financial assets		741,880		13,243,297		—		13,985,177		13,910,251
Loans and receivables		—		—		259,565,952		259,565,952		258,392,633
Financial liabilities:
Deposits due to customers		—		221,001,466		—		221,001,466		221,020,411
Borrowings		—		18,785,325		—		18,785,325		18,769,515
Debentures		—		24,004,668		—		24,004,668		23,565,449
Other financial liabilities		—		21,984,171		—		21,984,171		21,985,086

	As of December 31, 2017
	Fair value								Book value
	Level 1		Level 2		Level 3		Total
Financial assets:
Held-to-maturity financial assets		1,206,292		15,509,387		—		16,715,679		16,749,296
Loans and receivables		—		—		265,570,649		265,570,649		267,106,204
Financial liabilities:
Deposits due to customers		—		234,682,775		—		234,682,775		234,695,084
Borrowings		—		14,754,506		—		14,754,506		14,784,706
Debentures		—		27,889,781		—		27,889,781		27,869,651
Other financial liabilities		—		13,890,789		—		13,890,789		13,892,461

Valuation techniques and inputs used in fair value measurement of financial instruments measured at amortised costs [Table Text Block]

The fair values of financial instruments are measured using quoted market price in active markets. In case there is no active market for financial instruments, the Group determines the fair value using alternative assumptions through developing fair value measurement methods. Alternative assumptions and fair value measurement methods for financial assets and liabilities that are measured at amortized costs are given as follows:

	Fair value measurement technique	Input variables
Debt securities	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	Risk-free market rate and credit spread
Loans and receivables	The fair value is measured by discounting the projected cash flows of loan products by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the debtor.	Risk-free market rate, credit spread and prepayment-rate
Deposit due to customers, borrowings, debentures, and other financial liabilities	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting credit rating of the Group.	Risk-free market rate and forward rate

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Derecognition and offset of financial instruments (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of derecognition and offsetting of financial assets and liabilities [Abstract]

Transferred financial assets that are derecognized in their entirety

1) The book value, fair value of, and maximum exposure to loss from the financial assets that were derecognized from the consolidated financial statements of the Group through disposals, but the Group still have continuous involvements are given as below:

2016

As of December 31

For the year ended December 31

Classification

Carrying amount of Continuing involvement

Fair value amount of Continuing involvement

Maximum exposure to loss

Gain(loss) recognized in the year

Accumulated Gain(loss) recognized

Asset

Liability

Asset

Liability

Conditional disposal of loans to KAMCO(*)

Off-balance item

—

—

—

—

701

—

—

2017

As of December 31

For the year ended December 31

Classification

Carrying amount of Continuing involvement

Fair value amount of Continuing involvement

Maximum exposure to loss

Gain(loss) recognized in the year

Accumulated Gain(loss) recognized

Asset

Liability

Asset

Liability

Conditional disposal of loans to KAMCO(*)

Off-balance item

—

—

—

—

—

—

—

(*) KAMCO is still in the process of collecting cash flows related to the transferred assets and the maximum exposure to loss represents the carrying amounts of the assets at the date when they were transferred to KAMCO. Under previous Korea Generally Accepted Accounting Principles (K-GAAP), the Group derecognized the transferred assets although the Group retains and continues to retain substantially all such risks and rewards and according to the transition exemptions in IFRS 1 “First-time adoption of International Financial Reporting Standard”, the Group did not reassess the derecognition criteria for these transfers. As the process of collecting cash flows is completed, there is no financial instruments that qualify for derecognition but the Group still has continuous involvement as of December 31, 2017.

Schedule of financial assets under repurchase agreement transferred during period which do not qualify for derecognition [Table Text Block]

Disposal of securities under repurchase agreement

The financial instruments that were disposed but the Group agreed to repurchase at the fixed amounts at the same time, so that they did not meet the conditions of derecognition, are as follows:

		December 31, 2016		December 31, 2017
Assets transferred	AFS financial assets		2,546,683		9,998
	HTM financial assets		7,133		5,436
	Total		2,553,816		15,434
Related liabilities	Bonds sold under repurchase agreements		2,004,905		3,173

Schedule of securities lent during period which do not qualify for derecognition [Table Text Block]

Loaned securities

When the Group loans its securities to outside parties, the legal ownerships of the securities are transferred, however, they should be returned at the end of lending period therefore the Group does not derecognize them from the consolidated financial statements as it owns majority of risks and benefits from the securities continuously regardless of the transfer of legal ownership.

		December 31, 2016		December 31, 2017		Loaned to
Financial assets at FVTPL	Equity securities- listed stock		4,459		—	Samsung Securities Co., Ltd. and others
AFS financial assets	Korean treasury and government agencies bonds		493,579		170,256	Korea Securities Depository and others
	Total		498,038		170,256

Financial instruments subject to offset enforceable master netting agreements or similar agreements

As at the end of reporting periods, the financial instruments to be set off and may be covered by master netting agreements and similar agreements are given as below:

	December 31, 2016
	Gross amounts of recognized financial assets		Gross amounts of recognized financial liabilities set off		Net amounts of financial assets presented		Related amounts not set off in the statement of financial position				Net amounts
							Offsetting     agreement		Cash collateral     received
Financial assets:
Derivative assets and others(*1)		2,962,969		8,442		2,954,527		6,546,232		69,834		1,016,550
Receivable spot exchange(*2)		4,678,089		—		4,678,089
Bonds purchased under resale agreements(*2)		8,854,753		—		8,854,753		8,854,753		—		—
Domestic exchanges receivable(*2)(*5)		31,456,123		30,883,281		572,842		—		—		572,842
Total		47,951,934		30,891,723		17,060,211		15,400,985		69,834		1,589,392

	December 31, 2016
	Gross amounts of recognized financial liabilities		Gross amounts of recognized financial assets set off		Net amounts of financial liabilities presented		Related amounts not set off in the statement of financial position				Net amounts
							Offsetting     agreement		Cash collateral     pledged
Financial liabilities:
Derivative liabilities and others(*1)		3,467,374		8,442		3,458,932		6,695,062		105,270		1,341,375
Payable spot exchange(*3)		4,682,775		—		4,682,775
Bonds sold under repurchase agreements(*4)		2,004,905		—		2,004,905		2,004,905		—		—
Domestic exchanges payable(*3)(*5)		39,345,524		30,883,281		8,462,243		6,161,151		—		2,301,092
Total		49,500,578		30,891,723		18,608,855		14,861,118		105,270		3,642,467

	December 31, 2017
	Gross amounts of recognized financial assets		Gross amounts of recognized financial assets set off		Net amounts of financial assets presented		Related amounts not set off in the consolidated statement of financial position				Net amounts
							Netting agreements and others		Cash collateral     received
Financial assets:
Derivative assets and others(*1)		2,992,476		1,710		2,990,766		5,787,448		174,415		796,629
Receivable spot exchange(*2)		3,767,726		—		3,767,726
Bonds purchased under resale agreements(*2)		16,859,064		—		16,859,064		16,859,064		—		—
Domestic exchanges receivable(*2)(*5)		39,050,227		38,985,354		64,873		—		—		64,873
Total		62,669,493		38,987,064		23,682,429		22,646,512		174,415		861,502

	December 31, 2017
	Gross amounts of recognized financial liabilities		Gross amounts of recognized financial liabilities set off		Net amounts of financial liabilities presented		Related amounts not set off in the consolidated statement of financial position				Net amounts
							Netting agreements and others		Cash collateral pledged
Financial liabilities:
Derivative liabilities and others(*1)		3,160,217		1,710		3,158,507		5,866,682		157,750		857,961
Payable spot exchange(*3)		3,723,886		—		3,723,886
Bonds sold under repurchase agreements(*4)		3,173		—		3,173		3,173		—		—
Domestic exchanges payable(*3)(*5)		40,284,515		38,985,354		1,299,161		1,293,931		—		5,230
Total		47,171,791		38,987,064		8,184,727		7,163,786		157,750		863,191

(*1) Others include derivatives held for trading, derivatives for hedging and equity linked securities related to derivatives.

(*2) Items are included in loans and receivables.

(*3) Items are included in other financial liabilities.

(*4) Items are included in borrowings.

(*5) Certain financial assets and liabilities are presented as offset.

XML

Investment in Joint Ventures and Associates (Tables)

12 Months Ended

Dec. 31, 2017

Equity Method Investments And Joint Ventures [Abstract]

Schedule of investments in associates and joint ventures accounted for using equity method [Table Text Block]

13. INVESTMENTS IN JOINT VENTURES AND ASSOCIATES

(1) Investments in joint ventures and associates accounted for using the equity method of accounting are as follows (Unit: Korean Won in millions):

		Percentage of ownership (%)				Financial statement used as of
Investors and investees	Main business	December 31, 2016		December 31, 2017
Woori Bank and Woori Private Equity Asset Management Co., Ltd.:
Woori Blackstone Korea Opportunity No.1 Private Equity Fund(*19)	Other finance business		26.4		—	—
Woori Bank:
Kumho Tire Co., Inc.(*1)(*2)	Manufacturing		14.2		14.2	September 30(*3)
Woori Service Networks Co., Ltd.(*4)	Freight & staffing services		4.9		4.9	November 30(*3)
Korea Credit Bureau Co., Ltd.(*5)	Credit information		9.9		9.9	December 31
Korea Finance Security Co., Ltd.(*4)	Security service		15.0		15.0	November 30(*3)
Chin Hung International Inc.(*2)(*9)	Construction		28.4		25.3	November 30(*3)
Poonglim Industrial Co., Ltd.(*6)(*12)(*14)	Construction		31.0		29.4	September 30(*3)
STX Engine Co., Ltd.(*1)(*2)(*20)	Manufacturing		29.2		29.2	—
Samho International Co., Ltd.(*2)(*18)	Construction		7.8		—	—
Force TEC Co., Ltd.(*6)(*15)	Freight & staffing services		34.4		—	—
STX Corporation(*1)(*2)(*6)(*13)	Wholesale of non-specialized goods		9.5		19.7	September 30(*3)
Saman Corporation(*5)	General construction Technology service		9.2		9.2	September 30(*3)
Dongwoo C & C Co., Ltd.(*6)	Construction		23.2		23.2	—
SJCO Co., Ltd.(*6)	Aggregate transportation and wholesale		26.5		26.5	—
G2 Collection Co., Ltd.(*6)	Wholesale and retail sales		28.9		28.9	—
The Base Enterprise Co., Ltd.(*6)	Manufacturing		48.4		48.4	—
Heungjiwon Co., Ltd.(*6)(*17)	Other printing		27.8		—	—
Kyesan Engineering Co., Ltd.(*6)	Construction		23.2		23.2	—
Good Software Lap Co., Ltd.(*6)	Service		28.9		28.9	—
Wongwang Co., Ltd.(*6)	Wholesale and real estate		29.0		29.0	—
Sejin Construction Co., Ltd.(*6)	Construction		29.6		29.6	—
Deokwon Food Co., Ltd.(*6)(*17)	Poultry processing and storage		27.3		—	—
QTS Shipping Co., Ltd.(*6)	Complex transportation brokerage		49.4		49.4	—
DAEA SNC Co., Ltd.(*6)	Wholesale and retail sales		24.0		24.0	—
ARES-TECH Co., Ltd.(*6)	Electronic component manufacturing		23.4		23.4	—
Reading Doctors Co., Ltd.(*6)(*10)	Other service business		—		35.4	—
PREXCO Co., Ltd.(*6)(*10)	Manufacturing		—		28.1	—
Hyunwoo International Co., Ltd.(*6)(*10)	Manufacturing		—		25.9	—
Jiwon Plating Co., Ltd.(*6)(*16)	Plating		—		20.5	—
Cultizm Korea LTD Co., Ltd.(*6)(*16)	Wholesale and retail sales		—		31.3	—
Gil Co.,Ltd.(*6)(*16)	Manufacturing		—		26.1	—
NK Eng Co., Ltd.(*6)(*10)	Manufacturing		—		23.1	—
Woori Growth Partnerships New Technology Private Equity Fund	Other financial business		23.1		23.1	December 31
2016KIF-IMM Woori Bank Technology Venture Fund	Other financial business		20.0		20.0	December 31
K BANK Co., Ltd.(*5)	Finance		13.0		13.8	November 30(*3)
Smart Private Equity Fund No.2(*11)	Other financial business		—		20.0	December 31
Woori Bank-Company K Korea Movie Asset Fund(*11)	Other financial business		—		25.0	December 31
Well to Sea No. 3 Private Equity Fund(*11)	Finance		—		50.0	September 30(*3)
Woori Private Equity Fund:
Woori Renaissance Holdings(*7)	Other financial business		51.6		—	—
Woori Private Equity Asset Management Co., Ltd.,:
Woori Columbus 1st Private Equity Fund(*8)	Other financial business		2.0		—	—
Woori Investment Bank Co., Ltd.
Nomura-Rifa Private Real Estate Investment Trust No.17(*11)	Other financial business		—		25.0	December 31

(*1) The Group has significant influence on these entities through its position in the creditors’ council which is the decision making body regarding to financial and operational policies of associates.

(*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won).

(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.

(*4) Most of the significant business transactions of associates are with the Group as of December 31, 2016 and 2017.

(*5) The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.

(*6) The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.

(*7) The Group owns over 50% ownership as of December 31, 2016. However, the investment in this entity was accounted for using equity method as the ownership and related contracts meet the definition of joint arrangement under IFRS 11 Joint Arrangements. As of December 31, 2017 the entity has been excluded from the range of associates as liquidated.

(*8) As a general partner of Woori Columbus 1st Private Equity Fund, the Group had significant influence over the entity’s operational and financial policy making process, including participating in making decision of dividend or other distribution. As such, the investment in this entity was accounted for using equity method as of December 31, 2016. The Woori Columbus 1st Private Equity Fund has been removed from the list of associated companies as it was liquidated during the current period.

(*9) Due to consolidation of stocks and debt-equity swap, the Group’s number of holding shares and ownership ratio have decreased.

(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.

(*11) Due to capital contribution by the Group during the years ended December 31, 2017, the entities were included in the investment in associates.

(*12) The Group has sold a part of shares of the associates so the number of shares holding has decreased during the years ended December 31, 2017.

(*13) Due to debt-equity swap capital stock, the Group ownership ratio has increased during the years ended December 31, 2017.

(*14) As the carrying amounts of certain investments in associates had been reduced to zero, the Group discontinued the use of the equity method in accounting for those investments, and unrecognized losses due to the restricted application of equity method amount to 612 million Won and 16,344 million Won as of December 31, 2016 and 2017, respectively.

(*15) Not in scope for the associates, because the Group does not have significant influence over the entity due to the fact that it is going through workout process under receivership as of December 31, 2017.

(*16) Due to debt-equity swap, the entity was included in the investment in associates during the years ended December 31, 2017.

(*17) As the Group sold its entire ownership interest of the entities, it was exclude from the investment in associates during the years ended December 31, 2017.

(*18) The entity was sold after it was transferred to assets held for sale and was excluded from the investment in associates.

(*19) It has been removed from the list of associated companies as it was liquidated during the current period.

(*20) The shares of STX Engine Co., Ltd. owned by the Group were reclassified as assets held for sale, as the creditor financial institutions committee entered into a contract with UAMCO.,Ltd during the current period to sell STX Engine Co., Ltd. shares.

Schedule of changes in carrying value of investments in associates and joint ventures accounted for using equity method [Table Text Block]

(2) Changes in the carrying value of investments in joint ventures and associates accounted for using the equity method of accounting are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Acquisition cost		January 1, 2015		Share of profits (losses)			Acquisi- tion(*3)		Disposal and others			Dividends			Change in Capital			Impairment			Other changes		December 31, 2015
Woori Blackstone Korea Opportunity Private Equity Fund No.1		81,608		100,436		9,266			—		(37,367	)		(16,291	)		—			—			—		56,044
Kumho Tire Co., Inc.		175,652		224,829		(11,979	)		—		—			—			1,201			—			—		214,051
Woori Service Networks Co., Ltd.		108		130		21			—		—			(12	)		—			—			—		139
Korea Credit Bureau Co., Ltd.		2,215		3,378		335			1,098		—			—			480			—			—		5,291
Korea Finance Security Co., Ltd.		3,337		4,272		(425	)		—		(81	)		(55	)		—			—			—		3,711
United PF 1st Corporate financial stability		191,617		203,418		3,350			—		(19,176	)		—			—			—			—		187,592
Chin Hung International Inc.		60,275		28,491		(14,489	)		29,451		—			—			482			—			—		43,935
Poonglim Industrial Co., Ltd.		13,917		—		10,643			—		—			—			(1	)		(22,472	)		17,143		5,313
STX Engine Co., Ltd.		47,008		2,293		(3,901	)		45,030		—			—			1,823			—			6,031		51,276
Samho Co., Ltd.		7,492		11,257		3,012			—		—			—			56			—			—		14,325
STX Corporation		42,215		14,347		(10,673	)		—		—			—			559			—			18		4,251
Osung LST Co., Ltd.		15,405		18,482		(4,322	)		—		—			—			4			(33,839	)		30,660		10,985
Saman Corporation		8,521		—		—			8,521		—			—			—			—			—		8,521
Phoenix Digital Tech Co., Ltd.		1,334		—		1,610			—		(1,610	)		—			—			—			—		—
Woori Renaissance Holdings		63,000		36,019		3,518			—		—			(2,416	)		—			—			—		37,121
Woori Columbus First PEF		1,200		1,084		222			—		—			—			—			—			—		1,306
Total		714,904		648,436		(13,812	)		84,100		(58,234	)		(18,774	)		4,604			(56,311	)		53,852		643,861

	For the year ended December 31, 2016
	Acquisition cost		January 1, 2016		Share of profits (losses)			Acquisi- tion(*1)		Disposal and others(*2)			Dividends			Change in Capital			Impairment			December 31, 2016
Woori Blackstone Korea Opportunity Private Equity Fund No.1		43,917		56,044		10,093			—		(37,036	)		(13,812	)		—			—			15,289
Kumho Tire Co., Inc.		175,652		214,050		(13,172	)		—		—			—			(546	)		—			200,332
Woori Service Networks Co., Ltd.		108		139		18			—		—			(12	)		—			—			145
Korea Credit Bureau Co., Ltd.		3,313		5,291		436			—		—			(135	)		—			—			5,592
Korea Finance Security Co., Ltd.		3,266		3,711		(281	)		—		—			(54	)		—			—			3,376
United PF 1st Corporate financial stability		172,441		187,592		3,265			—		(190,857	)		—			—			—			—
Chin Hung International Inc.		89,725		43,936		(996	)		—		—			—			92			—			43,032
Poonglim Industrial Co., Ltd.		13,916		5,313		(2,378	)		—		—			—			(2,935	)		—			—
STX Engine Co., Ltd.		92,038		51,276		(6,665	)		—		—			—			(1,575	)		—			43,036
Samho Co., Ltd.		7,492		14,325		5,392			—		—			—			12			—			19,729
STX Corporation		42,215		4,251		(4,222	)		—		—			—			(29	)		—			—
Osung LST Co., Ltd.		15,405		10,985		(2,903	)		—		(6,909	)		—			—			(1,173	)		—
Saman Corporation		8,521		8,521		252			—		—			—			(74	)		—			8,699
K-Growth crowd 2step Fund		800		—		(13	)		800		(787	)		—			—			—			—
Woori Growth Partnerships New Technology Private Equity Fund		13,602		—		(640	)		13,602		—			—			156			—			13,118
2016KIF-IMM Woori Bank Technology Venture Fund		1,800		—		—			1,800		—			—			—			—			1,800
K BANK Co.,Ltd.		32,500		—		(1,589	)		32,500		—			—			(469	)		—			30,442
Woori Renaissance Holdings		63,000		37,121		17,303			—		—			(2	)		—			—			54,422
Woori Columbus First PEF		1,200		1,306		(43	)		—		(1,065	)		(198	)		—			—			—
Total		780,911		643,861		3,857			48,702		(236,654	)		(14,213	)		(5,368	)		(1,173	)		439,012

	For the year ended December 31, 2017
	Acquisition cost		January 1, 2017		Share of profits (losses)			Acquisi- tion(*4)		Disposal and others(*5)			Dividends			Change in capital			Impairment			Others(*4)			December 31, 2017
Woori Blackstone Korea Opportunity No.1 Private Equity Fund		—		15,289		(4,617	)		—		(7,369	)		(3,303	)		—			—			—			—
Kumho Tire Co., Inc.		175,652		200,332		(102	)		—		—			—			1,545			(102,842	)		—			98,933
Woori Service Networks Co., Ltd.		108		145		21			—		—			(8	)		—			—			—			158
Korea Credit Bureau Co., Ltd.		3,313		5,592		371			—		—			(147	)		—			—			—			5,816
Korea Finance Security Co., Ltd.		3,266		3,376		197			—		—			(54	)		—			—			—			3,519
Chin Hung International Inc.		89,725		43,032		(14,375	)		41,053		—			—			1,535			—			(26,144	)		45,101
Poonglim Industrial Co., Ltd.		13,916		—		(6,733	)		—		—			—			—			—			6,733			—
STX Engine Co., Ltd.		92,038		43,036		(1,010	)		—		(46,217	)		—			4,191			—			—			—
Samho Co., Ltd.		7,492		19,729		2,021			—		(16,354	)		—			(73	)		(5,323	)		—			—
STX Corporation		42,215		—		(29,788	)		8,546		—			—			417			—			27,772			6,947
Saman Corporation		8,521		8,699		(733	)		—		—			—			26			(6,738	)		—			1,254
Woori Growth Partnerships New Technology Private Equity Fund		13,602		13,118		(582	)		15,729		(498	)		—			(156	)		—			—			27,611
2016KIF-IMM Woori Bank Technology Venture Fund		1,800		1,800		—			5,040		—			—			—			—			—			6,840
K BANK Co., Ltd.		32,500		30,442		(11,381	)		12,892		—			—			(245	)		—			27			31,735
Smart Private Equity Fund No.2		3,000		—		(68	)		3,000		—			—			—			—			—			2,932
Woori Bank-Company K Korea Movie Asset Fund		1,500		—		(43	)		3,000		—			—			—			—			—			2,957
Well to Sea No.3 Private Equity Fund		102,500		—		80,894			102,500		(508	)		—			(577	)		—			—			182,309
Woori Renaissance Holdings		—		54,422		(622	)		—		—			(57,109	)		—			—			3,309			—
Nomura-Rifa Private Real Estate Investment Trust No.17		1,000		—		(61	)		1,000		—			—			—			—			—			939
		592,148		439,012		13,389			192,760		(70,946	)		(60,621	)		6,663			(114,903	)		11,697			417,051

(*1) AFS financial assets decreased by 5,421 million Won due to transfers to investments in associates during the year ended December 31, 2016.

(*2) The transfers from investments in associates to AFS financial assets amounted to 155,220 million Won and the transfers from investments in associates to assets held for sale amounted to 6,909 million Won during the year ended December 31, 2016.

(*3) Investments in associates increased by 83,002 million Won due to transfers between accounts, such as loan-equity swap occurred during the year ended December 31, 2015.

(*4) Changes in investments in joint ventures and associates due to debt-equity swap is 51,227 million Won during the year ended December 31, 2017.

(*5) The Investments in Associates reclassified as assets held for sale amount to 62,571 million Won, of which 16,354 million Won was disposed of during the year ended December 31, 2017.

Reconciliation of summarised financial information of associates and joint ventures accounted for using equity method to carrying amount of interest in associates and joint ventures [Table Text Block]

(3) Financial information relating to investments in joint ventures and associates accounted for using the equity method of accounting is as follows (Unit: Korean Won in millions):

	December 31, 2016
	Assets		Liabilities		Operating revenue		Net income (loss)
Woori Blackstone Korea Opportunity No.1 Private Equity Fund		57,971		427		75,084		38,226
Kumho Tire Co., Inc.		5,079,740		3,914,306		2,156,667		(53,328	)
Woori Service Networks Co., Ltd.		4,722		1,782		14,875		801
Korea Credit Bureau Co., Ltd.		71,245		17,322		59,868		3,517
Korea Finance Security Co., Ltd.		32,262		9,759		52,657		700
Chin Hung International Inc.		421,710		354,995		578,640		794
Poonglim Industrial Co., Ltd.		304,718		323,765		156,770		(15,135	)
STX Engine Co., Ltd.		865,265		769,481		372,295		(22,978	)
Samho Co., Ltd.		740,786		489,130		909,927		68,077
STX Corporation		781,622		1,087,469		1,252,968		(378,782	)
Saman Corporation		83,380		47,175		72,850		2,746
Woori Growth Partnerships New Technology Private Equity Fund		57,339		493		37		(2,177	)
2016KIF-IMM Woori Bank Technology Venture Fund		9,005		254		5		(250	)
K BANK Co., Ltd.		239,806		5,633		2,927		(12,222	)
Woori Renaissance Holdings Inc.		127,411		26,703		37,206		33,508
Woori Columbus 1st Private Equity Fund		811		506		3,764		(450	)

	December 31, 2017
	Assets		Liabilities		Operating revenue		Net income (loss)
Kumho Tire Co., Inc.		5,105,107		3,928,327		2,136,569		(61,748	)
Woori Service Networks Co., Ltd.		4,982		1,780		14,887		1,003
Korea Credit Bureau Co., Ltd.		75,504		19,323		68,750		3,580
Korea Finance Security Co., Ltd.		33,915		10,461		55,610		1,071
Chin Hung International Inc.		341,284		259,454		513,285		28,698
Poonglim Industrial Co., Ltd.		241,063		309,925		107,360		(29,812	)
STX Corporation		595,348		543,458		1,371,272		342,869
Saman Corporation		98,435		69,929		76,135		(6,096	)
Woori Growth Partnerships New Technology Private Equity Fund		120,133		485		1,024		(3,199	)
2016KIF-IMM Woori Bank Technology Venture Fund		32,815		380		6		(1,515	)
K BANK Co., Ltd.		1,244,270		1,001,121		19,231		(74,403	)
Smart Private Equity Fund No.2		14,711		51		1		(340	)
Woori Bank-Company K Korea Movie Asset Fund		11,830		2		16		(172	)
Well to Sea No.3 Private Equity Fund		5,068,424		4,534,957		131,488		162,743
Nomura-Rifa Private Real Estate Investment Trust No.17		20,265		16,507		62		(242	)

Schedule of investments that were not accounted for using equity method [Table Text Block]

(4) The entities that the Group has not applied equity method of accounting although the Group’s ownership ratio is more than 20% as of December 31, 2016 and 2017, are as follows:

	As of December 31, 2016
	Number of shares owned		Ownership (%)
Orient Shipyard Co., Ltd.(*)		465,050		23.0	%
Saenuel Co., Ltd.(*)		3,531		37.4	%
E Mirae Tech Co., Ltd.(*)		7,696		41.0	%
Jehin Trading Co., Ltd.(*)		81,610		27.3	%
NK Eng Co., Ltd.(*)		697,033		23.1	%
The season Co., Ltd.(*)		18,187		30.1	%
Yuil PESC Co., Ltd.(*)		8,642		24.0	%
Youngdong Sea Food Co., Ltd.(*)		12,106		24.0	%
Sinseong Trading Co., Ltd.(*)		2,584		27.2	%
Reading Doctors Co., Ltd.(*)		7,398		35.4	%
PREXCO Co., Ltd.(*)		919,972		28.1	%
Hyunwoo International Co., Ltd.(*)		59,873		25.9	%

	As of December 31, 2017
	Number of shares owned		Ownership (%)
Orient Shipyard Co., Ltd.(*)		465,050		21.4	%
Saenuel Co., Ltd.(*)		3,531		37.4	%
E Mirae Tech Co., Ltd.(*)		7,696		41.0	%
Jehin Trading Co., Ltd.(*)		81,610		27.3	%
The season Co., Ltd.(*)		18,187		30.1	%
Yuil PESC Co., Ltd.(*)		8,642		24.0	%
Youngdong Sea Food Co., Ltd.(*)		12,106		24.0	%
Sinseong Trading Co., Ltd.(*)		2,584		27.2	%
CL Tech Co., Ltd.(*)		13,759		38.6	%
Force TEC Co., Ltd.(*)		4,780,907		25.8	%
Protronics Co., Ltd.(*)		95,921		48.1	%
Instern Co., Ltd.(*)		14,296		20.1	%

(*) Even though the Group’s ownership interest of the entity is more than 20%, the Group does not have significant influence over the entity since it is going through work-out process under receivership, thus it is excluded from the investment in associates.

Reconciliation from net assets of investments in associates and joint ventures accounted for using equity method to book value [Table Text Block]

(5) As of December 31, 2015, 2016 and 2017, the reconciliations from the net assets of associates based on the ownership ratio of the Group to its corresponding book value of investment in joint ventures and associates are as follows (Unit: Korean Won in millions except for ownership):

	As of December 31, 2015
	Total net asset			Ownership (%)		Net assets of associates (or joint ventures)			cost-book value differential(*1)		Impairment			Intercompany transaction and others			Book value
Woori Blackstone Korea Opportunity Private Equity Fund No.1		211,757			26.4		55,900			—		—			144			56,044
Kumho Tire Co., Inc.(*2)		1,152,161			14.2		163,042			48,459		—			2,549			214,050
Woori Service Networks Co., Ltd.		2,805			4.9		139			—		—			—			139
Korea Credit Bureau		50,884			9.9		5,043			248		—			—			5,291
Korea Finance Security Co., Ltd.		24,738			15.0		3,711			—		—			—			3,711
United PF 1st Corporate financial stability		1,057,935			17.7		187,538			—		—			54			187,592
Chin Hung International Inc.(*2)		68,132			28.4		19,374			24,566		—			(4	)		43,936
Poonglim Industrial Co., Ltd.(*2)		(58,065	)		30.7		(17,837	)		45,622		(22,472	)		—			5,313
STX Engine Co., Ltd.(*2)		123,969			29.2		36,230			14,927		—			119			51,276
SamHo Co., Ltd.		182,730			7.8		14,325			—		—			—			14,325
STX Corporation		50,421			15.0		7,552			24,610		(28,370	)		459			4,251
Osung LST Co., Ltd.		82,878			11.1		9,238			35,597		(33,839	)		(11	)		10,985
Saman Corporation		31,636			9.2		2,911			5,610		—			—			8,521
Woori Renaissance Holdings		67,203			51.6		34,677			—		(6,441	)		8,885			37,121
Woori Columbus First PEF		67,904			1.9		1,304			6		—			(4	)		1,306

	As of December 31, 2016
	Total net asset			Ownership (%)		Net assets of associates (or joint ventures)			cost-book value differential(*1)		Impairment			Intercompany transaction and others			Book Value
Woori Blackstone Korea Opportunity Private Equity Fund No.1		57,544			26.4		15,191			—		—			98			15,289
Kumho Tire Co., Inc.(*2)		1,055,219			14.2		149,324			48,459		—			2,549			200,332
Woori Service Networks Co., Ltd.		2,940			4.9		145			—		—			—			145
Korea Credit Bureau		53,923			9.9		5,344			248		—			—			5,592
Korea Finance Security Co., Ltd.		22,503			15.0		3,376			—		—			—			3,376
Chin Hung International Inc.(*2)		65,387			28.4		18,593			24,565		—			(126	)		43,032
Poonglim Industrial Co., Ltd.(*2)		(111,156	)		31.0		(34,463	)		54,149		(21,062	)		1,376			—
STX Engine Co., Ltd.		95,784			29.2		28,002			14,954		—			80			43,036
SamHo Co., Ltd.		251,656			7.8		19,729			—		—			—			19,729
STX Corporation(*2)		(250,018	)		9.5		(23,633	)		24,614		(27,904	)		26,923			—
Saman Corporation		36,205			9.2		3,326			5,373		—			—			8,699
Woori Growth Partnerships New Technology Private Equity Fund		56,846			23.1		13,118			—		—			—			13,118
2016KIF-IMM Woori Bank Technology Venture Fund		8,751			20.0		1,750			—		—			50			1,800
K BANK Co.,Ltd.		234,173			13.0		30,442			—		—			—			30,442
Woori Renaissance Holdings		100,708			51.6		51,965			—		(6,441	)		8,898			54,422
Woori Columbus First PEF		305			2.0		6			—		—			(6	)		—

	As of December 31, 2017
	Total net asset			Ownership (%)		Net assets of associates (or joint ventures)			Cost-book value differential(*1)		Impairment			Intercompany transaction and others			Book value
Kumho Tire Co., Inc.(*2 and *3)		1,065,421			14.2		150,767			48,459		(102,843	)		2,550			98,933
Woori Service Networks Co., Ltd.		3,202			4.9		158			—		—			—			158
Korea Credit Bureau Co., Ltd.		56,181			9.9		5,568			248		—			—			5,816
Korea Finance Security Co., Ltd.		23,454			15.0		3,519			—		—			—			3,519
Chin Hung International Inc.(*2)		81,686			25.3		20,671			24,565		—			(135	)		45,101
Poonglim Industrial Co., Ltd.(*2)		(168,154	)		29.4		(49,446	)		54,542		(20,504	)		15,408			—
STX Corporation		51,890			19.7		10,232			24,614		(27,904	)		5			6,947
Saman Corporation		28,506			9.2		2,619			5,373		(6,738	)		—			1,254
Woori Growth Partnerships New Technology Private Equity Fund		119,648			23.1		27,611			—		—			—			27,611
2016KIF-IMM Woori Bank Technology Venture Fund		32,435			20.0		6,487			—		—			353			6,840
K BANK Co., Ltd.		243,149			13.0		31,535			—		—			200			31,735
Smart Private Equity Fund No.2		14,660			20.0		2,932			—		—			—			2,932
Woori Bank-Company K Korea Movie Asset Fund		11,828			25.0		2,957			—		—			—			2,957
Well to Sea No.3 Private Equity Fund(*2)		364,909			50.0		182,366			—		—			(57	)		182,309
Nomura-Rifa Private Real Estate Investment Trust No.17		3,758			25.0		939			—		—			—			939

(*1) It is attributed as the difference between the acquisition cost and the corresponding net asset when the Group acquired the associates.

(*2) The net asset amount is after considering preferred stocks, debt-equity swap and others.

(*3) The Group recognized 102,843 million of impairment loss on the investment due to a significant and prolonged decline in the stock price of the investment below its book value.

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Investment Properties (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Investment Property [Abstract]

Carrying amount of investment property [Table Text Block]

(1) Investment properties are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Acquisition cost		387,675			404,741
Accumulated depreciation		(29,178	)		(33,440	)
Net carrying value		358,497			371,301

Reconciliation of changes in investment property [Table Text Block]

Changes in investment properties are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		357,550			351,496			358,497
Acquisition		—			4,428			9,872
Disposal		—			—			(458	)
Depreciation		(3,806	)		(3,762	)		(3,902	)
Transfer		(2,297	)		6,314			2,472
Classified to assets held for sale		—			—			(371	)
Foreign currencies translation adjustments		49			21			(324	)
Others		—			—			5,515
Ending balance		351,496			358,497			371,301

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Premises and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Property Plant And Equipment [Abstract]

Carrying amount of property plant and equipment [Table Text Block]

Premises and equipment are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Land		Building			Properties for business use			Structures in leased office			Construction in progress		Structures			Total
Acquisition cost		1,488,745		855,332			1,010,141			424,562			18,717		20			3,797,517
Accumulated depreciation		—		(163,633	)		(820,239	)		(355,604	)		—		(16	)		(1,339,492	)
Net carrying value		1,488,745		691,699			189,902			68,958			18,717		4			2,458,025

	December 31, 2017
	Land		Building			Properties for business use			Structures in leased office			Construction in progress		Structures			Total
Acquisition cost		1,487,278		867,804			1,024,186			429,665			64,559		20			3,873,512
Accumulated depreciation		—		(186,958	)		(844,114	)		(364,878	)		—		(17	)		(1,395,967	)
Net carrying value		1,487,278		680,846			180,072			64,787			64,559		3			2,477,545

Reconciliation of changes in property plant and equipment [Table Text Block]

Changes in premises and equipment are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Land			Building			Properties for business use			Structures in leased office			Construction in progress			Structures			Total
Beginning balance		1,514,698			706,524			209,588			70,185			102			5			2,501,102
Acquisition		2,628			21,127			69,230			35,304			757			—			129,046
Disposal		(10,780	)		(648	)		(847	)		(2,000	)		(313	)		—			(14,588	)
Depreciation		—			(24,846	)		(85,279	)		(36,740	)		—			(1	)		(146,866	)
Classified to assets held for sale		(5,109	)		(8,348	)		—			—			—			—			(13,457	)
Foreign currencies translation adjustment		(328	)		(333	)		265			515			(19	)		—			100
Transfer		(7,481	)		9,778			—			—			—			—			2,297
Others		—			763			334			12,480			(5	)		—			13,572
Ending balance		1,493,628			704,017			193,291			79,744			522			4			2,471,206

	For the year ended December 31, 2016
	Land			Building			Properties for business use			Structures in leased office			Construction in progress			Structures		Total
Beginning balance		1,493,628			704,017			193,291			79,744			522			4		2,471,206
Acquisition		—			15,939			74,336			19,615			21,231			—		131,121
Disposal		(30	)		(1,474	)		(233	)		(2,623	)		(102	)		—		(4,462	)
Depreciation		—			(24,887	)		(82,445	)		(48,587	)		—			—		(155,919	)
Classified to assets held for sale		(4,063	)		(251	)		—			—			—			—		(4,314	)
Foreign currencies translation adjustment		625			516			307			376			153			—		1,977
Acquisition through business combination		—			—			209			442			—			—		651
Transfer		(1,415	)		(1,557	)		—			—			(3,087	)		—		(6,059	)
Others		—			(604	)		4,437			19,991			—			—		23,824
Ending balance		1,488,745			691,699			189,902			68,958			18,717			4		2,458,025

	For the year ended December 31, 2017
	Land			Building			Properties for business use			Structures in leased office			Construction in progress			Structures			Total
Beginning balance		1,488,745			691,699			189,902			68,958			18,717			4			2,458,025
Acquisition		4,755			22,579			59,694			23,420			51,797			—			162,245
Disposal		(1,840	)		(2,593	)		(442	)		(1,231	)		—			—			(6,106	)
Depreciation		—			(26,156	)		(74,223	)		(31,728	)		—			(1	)		(132,108	)
Classified from(to) assets held for sale		(2,693	)		(1,059	)		549			—			—			—			(3,203	)
Foreign currencies translation adjustment		(1,493	)		(1,393	)		(2,023	)		(1,315	)		(402	)		—			(6,626	)
Transfer		(196	)		(2,134	)		5,411			—			(5,553	)		—			(2,472	)
Others		—			(97	)		1,204			6,683			—			—			7,790
Ending balance		1,487,278			680,846			180,072			64,787			64,559			3			2,477,545

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Intangible Assets and Goodwill (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Intangible Assets [Abstract]

Carrying amount of intangible assets and goodwill [Table Text Block]

Intangible assets are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Goodwill		Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Acquisition cost		124,803		185,202			714			299,031			622,540			26,884			1,259,174
Accumulated amortization		—		(149,725	)		(401	)		(160,335	)		(458,088	)		—			(768,549	)
Accumulated impairment losses		—		—			—			—			(88	)		(6,798	)		(6,886	)
Net carrying value		124,803		35,477			313			138,696			164,364			20,086			483,739

	December 31, 2017
	Goodwill		Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Acquisition cost		108,707		203,418			1,063			413,296			634,150			27,337			1,387,971
Accumulated amortization		—		(162,746	)		(524	)		(182,846	)		(516,467	)		—			(862,583	)
Accumulated impairment losses		—		—			—			—			(137	)		(6,652	)		(6,789	)
Net carrying value		108,707		40,672			539			230,450			117,546			20,685			518,599

Reconciliation of changes in intangible assets and goodwill [Table Text Block]

Changes in intangible assets are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Goodwill			Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Beginning balance		107,541			47,821			328			55,337			60,807			23,894			295,728
Acquisition		—			7,347			96			16,751			196,139			2,510			222,843
Disposal		—			(189	)		—			(1,500	)		(12	)		—			(1,701	)
Amortization		—			(16,809	)		(81	)		(19,233	)		(53,969	)		—			(90,092	)
Impairment losses		—			—			—			—			(9	)		(1,911	)		(1,920	)
Foreign currencies translation adjustment		(4,016	)		1			1			2			(476	)		147			(4,341	)
Others		—			—			—			—			(711	)		—			(711	)
Ending balance		103,525			38,171			344			51,357			201,769			24,640			419,806

	For the year ended December 31, 2016
	Goodwill		Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Beginning balance		103,525		38,171			344			51,357			201,769			24,640			419,806
Acquisition		—		8,708			64			92,969			30,842			2,306			134,889
Disposal		—		—			—			—			(23	)		(3,785	)		(3,808	)
Amortization		—		(15,795	)		(95	)		(18,657	)		(57,803	)		—			(92,350	)
Impairment losses		—		—			—			—			3,230			(1,585	)		1,645
Foreign currencies translation adjustment		7,338		16			—			—			853			50			8,257
Acquisition through business combination		7,857		162			—			—			—			43			8,062
Others		6,083		4,215			—			13,027			(14,504	)		(1,583	)		7,238
Ending balance		124,803		35,477			313			138,696			164,364			20,086			483,739

	For the year ended December 31, 2017
	Goodwill			Software			Industrial property rights			Development cost			Others			Membership deposit			Total
Beginning balance		124,803			35,477			313			138,696			164,364			20,086			483,739
Acquisition		105			9,722			349			122,849			22,531			1,867			157,423
Disposal		—			—			—			—			(37	)		(944	)		(981	)
Amortization		—			(16,258	)		(123	)		(22,534	)		(60,869	)		—			(99,784	)
Impairment losses		—			—			—			—			(78	)		(159	)		(237	)
Transfer		—			7,987			—			(7,987	)		—			—			—
Foreign currencies translation adjustment		(16,201	)		(952	)		—			(483	)		(2,742	)		(160	)		(20,538	)
Others		—			4,696			—			(91	)		(5,623	)		(5	)		(1,023	)
Ending balance		108,707			40,672			539			230,450			117,546			20,685			518,599

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Assets Held for sale (Tables)

12 Months Ended

Dec. 31, 2017

Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [Abstract]

Details of assets held for sale

Assets held for sale are as follows (Unit: Korean Won in millions):

	December 31, 2017		December 31, 2016
Investments in joint ventures and associates(*)		46,217		—
Premises and equipment		2,407		2,342
Total		48,624		2,342

(*) The shares of STX Engine Co., Ltd. owned by the Group are reclassified as assets held for sale, as the creditor financial institutions committee has entered into a contract with UAMCO., Ltd for the year ended December 31, 2017, to sell STX Engine Co., Ltd. shares.

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Assets Subject to Lien and Assets Acquired Through Foreclosures (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Collateral [Abstract]

Assets subjected to lien

18. ASSETS SUBJECT TO LIEN AND ASSETS ACQUIRED THROUGH FORECLOSURES

(1) Assets subjected to lien are as follows (Unit: Korean Won in millions):

		December 31, 2016
		Collateral given to	Amount		Reason for collateral
Loan and receivables	Due from banks in local currency	Samsung Securities and others		24,589	Margin deposit for futures and options and others
	Due from banks in foreign currencies	Korea Investment & Securities and others		227,249	Foreign margin deposit for future or option and others
Financial assets at FVTPL	Industrial and financial debt securities and others	Yuanta Securities and others		473,476	Substitute securities and others
AFS financial assets	Korean treasury and government agencies bonds	Korea Securities Depository and others		2,546,683	Related to bonds sold under repurchase agreements(*)
	Financial institutions debt securities and others	The BOK and others		836,522	Settlement risk and others
HTM financial assets	Korean treasury and government agencies bonds	Korea Securities Depository and others		7,133	Related to bonds sold under repurchase agreements(*)
	Korean treasury and government agencies bonds and others	The BOK and others		6,185,295	Settlement risk and others
Lands and buildings		Credit Counselling & Recovery Service and others		6,310	Leasehold rights and others
		Total		10,307,257

		December 31, 2017
		Collateral given to	Amount		Reason for collateral
Loan and receivables	Due from banks on time in local currency	Bank of China and others		6,629	Collaterals for issuing letter of guarantee and others
	Due from banks in local currency	Samsung Securities Co., Ltd. and others		10,809	Margin deposit for futures or option
	Due from banks in foreign currencies	Korea Investment & Securities Co., Ltd. and others		9,136	Foreign margin deposit for future or option and others
Financial assets at FVTPL	Financial institutions debt securities and others	Yuanta Securities Co., Ltd. and others		501,523	Substitute securities and others
AFS financial assets	Corporate bonds	Korea Securities Depository and others		9,998	Related to bonds sold under repurchase agreements(*)
	Korean treasury and government agencies bonds and others	The BOK and others		1,570,608	Settlement risk and others
HTM financial assets	Korean treasury and government agencies bonds	Korea Securities Depository		5,436	Related to bonds sold under repurchase agreements(*)
	Financial institutions debt securities and others	The BOK and others		7,605,292	Settlement risk and others
Lands and buildings	Land and building	Credit Counselling & Recovery Service and others		6,186	Leasehold rights and others
		Total		9,725,617

(*) The Group enters into the repurchase agreements at predetermined price or original sale price added with certain rate of return after the disposal of securities. In this regards, the securities are provided as collaterals, and the purchasers are eligible to dispose or provide them as collateral. Therefore, as such securities have been transferred but have not been derecognized, the Group recognizes the relevant amount as liability (bond sold under repurchase agreements).

Assets acquired through foreclosure [Table Text Block]

The carrying amounts of buildings acquired through foreclosure are as follow (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Land		4,138		332
Building		1,852		44
Properties not used in business		202		—
Total		6,192		376

Schedule of securities lent [Table Text Block]

(3) Loaned securities are as follows (Unit: Korean Won in millions):

		December 31, 2016		December 31, 2017		Loaned to
Financial assets at FVTPL	Korean Equity securities		4,459		—	Samsung Securities Co., Ltd. and others
AFS financial assets	Korean treasury and government agencies bonds and others		493,579		170,256	Korea Securities Depository and others
Total			498,038		170,256

Loaned securities are lending of specific securities to borrowers who agree to return the same quantity of the same security at the end of lending period. As the Group does not derecognize these securities, there are no liabilities related to loaned securities.

Collaterals held that can be disposed and re collateralized regardless of defaults of counterparties

(4) Collaterals held that can be disposed and re-collateralized regardless of defaults of counterparties

Fair values of collaterals held can be disposed and re-subjected to lien regardless of defaults of counterparties as of December 31, 2016 and 2017 are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Fair values of collaterals	Fair values of collaterals were disposed or re-subjected to lien
Securities	8,746,101	—

	December 31, 2017
	Fair values of collaterals	Fair values of collaterals were disposed or re-subjected to lien
Securities	17,671,490	—

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Other Assets (Tables)

12 Months Ended

Dec. 31, 2017

Miscellaneous assets [Abstract]

Details of other assets

Other assets are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Prepaid expenses		111,445		130,245
Advance payments		1,944		18,363
Non-operative assets		6,192		376
Others		9,265		9,420
Total		128,846		158,404

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Financial Liabilitiy at Fair Value Through Profit or Loss (Tables)

12 Months Ended

Dec. 31, 2017

Financial liabilities at fair value through profit or loss [Abstract]

Financial liabilities at fair value through profit or loss

Financial liabilities at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Financial liabilities held for trading		3,036,478		3,176,113
Financial liabilities designated at FVTPL		766,880		251,796
Total		3,803,358		3,427,909

Schedule of financial liabilities held for trading [Table Text Block]

Financial liabilities held for trading are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Deposits due to Customers:
Gold banking liabilities		26,501		25,964
Derivative liabilities		3,009,977		3,150,149
Total		3,036,478		3,176,113

Schedule of financial liabilities designated at fair value through profit or loss [Table Text Block]

Financial liabilities designated at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Equity linked securities index:
Equity linked securities index in short position		673,906		160,057
Debentures:
Debentures in local currency		92,974		91,739
Total		766,880		251,796

Schedule of changes in fair value of financial liability attributable to changes in credit risk of liability [Table Text Block]

(4) Credit risk adjustments to financial liabilities designated at FVTPL are as follows (Unit: Korean Won in millions):

	December 31, 2015			December 31, 2016			December 31, 2017
Financial liabilities designated at FVTPL subject to credit risk adjustments		854,862			766,880			251,796
Credit risk adjustments(*1)		(433	)		(8	)		(254	)
Accumulated changes in credit risk adjustments(*2)		311			349			133

(*1) The amounts in the tabular disclosure relating to Credit risk adjustments at 31 December 2016 and at 31 December 2015 have been restated by 811 million Won and 109 million Won, respectively, due to an error in the previous year’s disclosure.

(*2) The amounts in the tabular disclosure relating to Accumulated changes in credit risk adjustments at 31 December 2016 and at 31 December 2015 have been restated by 16,139 million Won and 15,327 million Won, respectively, due to an error in the previous year’s disclosure.

Difference between carrying amount of financial liabilities at fair value through profit or losss and amount contractually required to pay at maturity to holder of obligation [Table Text Block]

The differences between financial liabilities at FVTPL’s carrying amount and nominal amount at maturity are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Carrying amount		766,880			251,796
Nominal amount at maturity		902,375			255,408
Difference		(135,495	)		(3,612	)

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Deposits Due to Customers (Tables)

12 Months Ended

Dec. 31, 2017

Deposits from customers [Abstract]

Details of deposits sorted by interest type

Deposits sorted by interest type are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Deposits in local currency
Demand deposits		9,491,680			9,349,070
Time deposits		183,723,369			194,292,679
Mutual funds		37,128			34,055
Deposits on notes payables		943,446			1,323,679
Deposits on CMA		203,013			164,431
Certificate of deposits		3,836,430			4,436,443
Other deposits		1,360,176			1,451,841
Sub-total		199,595,242			211,052,198
Deposits in foreign currencies		21,453,096			23,682,896
Present value discount		(27,927	)		(40,010	)
Total		221,020,411			234,695,084

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Borrowings and Debentures (Tables)

12 Months Ended

Dec. 31, 2017

Borrowings [Abstract]

Details of borrowings

(1) Borrowings are as follows (Unit: Korean Won in millions):

	December 31, 2016
	Lenders	Interest rate (%)		Amount
Borrowings in local currency:
Borrowings from the Bank of Korea	The Bank of Korea		0.5 ~ 0.8		1,598,553
Borrowings from government funds	Small and Medium Business Corporation and others		0.0 ~ 3.5		1,534,807
Others	Seoul Metropolitan Government and others		0.0 ~ 3.8		3,922,878
Sub-total					7,056,238
Borrowings in foreign currencies:
Borrowings in foreign currencies	The Export-Import Bank of Korea and others		0.0 ~ 5.2		7,737,237
Offshore borrowings in foreign currencies	Wells Fargo		1.4		18,128
Sub-total					7,755,365
Bills sold	Others		0.0 ~ 1.6		26,895
Call money	Bank and others		0.0 ~ 5.1		1,926,779
Bonds sold under repurchase agreements	Other financial institutions		0.0 ~ 4.5		2,004,905
Present value discount					(667	)
Total					18,769,515

	December 31, 2017
	Lenders	Interest rate (%)		Amount
Borrowings in local currency:
Borrowings from The BOK	The BOK		0.5 ~ 0.8		1,404,087
Borrowings from government funds	Small Enterprise And Market Service and others		0.0 ~ 2.9		1,723,340
Others	The Korea Development Bank and others		0.0 ~ 3.2		3,957,421
Sub-total					7,084,848
Borrowings in foreign currencies:
Borrowings in foreign currencies	The Export-Import BOK and others		0.0 ~ 6.8		6,996,551
Offshore borrowings in foreign currencies	Commonwealth Bank		1.8		28,285
Sub-total					7,024,836
Bills sold	Others		0.0 ~ 1.2		36,953
Call money	Bank and others		1.5 ~ 2.7		635,061
Bonds sold under repurchase agreements	Other financial institutions		0.6 ~ 12.7		3,173
Present value discount					(165	)
Total					14,784,706

Schedule of debentures [Table Text Block]

(2) Debentures are as follows (Unit: Korean Won in millions):

	December 31, 2016					December 31, 2017
	Interest rate (%)		Amount			Interest rate (%)		Amount
Face value of bond(*)
Ordinary bonds		1.5 ~ 11.8		18,268,403			1.5 ~ 5.8		22,468,908
Subordinated bonds		3.0 ~ 12.6		5,327,335			3.4 ~ 12.6		4,781,301
Other bonds		17.0		4,006			1.6 ~ 17.0		649,615
Sub-total				23,599,744					27,899,824
Discounts on bond				(34,295	)				(30,173	)
Total				23,565,449					27,869,651

(*) Included debentures under fair value hedge relationships are 3,610,193 million Won and 3,102,386 million Won as of December 31, 2016 and 2017, respectively. Also, debentures under cash flow hedge amounting to 699,029 million Won are included as of December 31, 2017

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Provisions (Tables)

12 Months Ended

Dec. 31, 2017

Provisions [Abstract]

Schedule of provisions [Table Text Block]

(1) Provisions are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Asset retirement obligation		58,076		61,872
Provision for guarantee (*1)		238,117		183,247
Provision for loan commitments		87,909		66,115
Provisions for customer reward credits		22,093		40,445
Other provisions (*2)		22,282		58,791
Total		428,477		410,470

(*1) Provision for guarantee includes provision for financial guarantee of 67,557 million Won and 71,697 million Won as of December 31, 2016 and 2017, respectively.

(*2) Other provisions consist of provision for litigation, provision for loss recovery, and others.

Reconciliation of changes in other provisions [Table Text Block]

(2) Changes in provisions except for asset retirement obligation are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Provision for guarantees			Provision for loan commitments			Provisions for customer reward credits			Other provisions			Total
Beginning balance		509,320			90,449			5,548			56,959			662,276
Provisions provided		19,714			9,801			16,301			51,997			97,813
Provisions used and others		(25,262	)		41			(16,404	)		(86,308	)		(127,933	)
Reversal of unused amount		(160,032	)		(14,976	)		—			(43	)		(175,051	)
Others		20,401			(2	)		—			(24	)		20,375
Ending balance		364,141			85,313			5,445			22,581			477,480

	For the year ended December 31, 2016
	Provision for guarantees			Provision for loan commitments			Provisions for customer reward credits			Other provisions			Total
Beginning balance		364,141			85,313			5,445			22,581			477,480
Provisions provided		4,281			8,502			23,525			8,034			44,342
Provisions used and others		(80,017	)		22			(8,158	)		(11,323	)		(99,476	)
Reversal of unused amount		(64,061	)		(5,409	)		—			—			(69,470	)
Foreign currencies translation adjustments		—			—			—			2,990			2,990
Transfer(*1)		—			—			503			—			503
Others		13,773			(519	)		778			—			14,032
Ending balance		238,117			87,909			22,093			22,282			370,401

	For the year ended December 31, 2017
	Provision for guarantees			Provision for unused commitments			Provisions for customer reward credits			Other provisions			Total
Beginning balance		238,117			87,909			22,093			22,282			370,401
Provisions provided		4,876			2,028			62,593			42,042			111,539
Provisions used and others		(24,898	)		(68	)		(84,979	)		(8,014	)		(117,959	)
Reversal of unused amount		(60,300	)		(23,744	)		—			(77	)		(84,121	)
Foreign currencies translation adjustments		9			(10	)		—			(249	)		(250	)
Transfer(*2)		—			—			21,808			—			21,808
Others		25,443			—			18,930			2,807			47,180
Ending balance		183,247			66,115			40,445			58,791			348,598

(*1) As the credits of the affiliates were transferred to the Group, the allowance for the provisions for customer reward credits increased, for the year ended December 31, 2016.

(*2) According to contracts with the third parties, the Group ultimately will be reimbursed for which it has paid out on behalf of customers, which has incurred through their customer loyalty programs. Therefore, when such obligation incurs, the Group recognizes it as “transfer”, but there is no impact on the Group’s expense.

Reconciliation of changes in provision for decommissioning restoration and rehabilitation costs [Table Text Block]

(3) Changes in asset retirement obligation are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		29,733			39,121			58,076
Provisions provided		1,742			2,034			2,225
Provisions used		(1,316	)		(1,279	)		(1,283	)
Amortization		394			464			428
Reversal of unused amount		(179	)		(1	)		(733	)
Increase in restoration costs and others		8,747			17,737			3,159
Ending balance		39,121			58,076			61,872

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Net Defined Benefits Liability (Asset) (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of defined benefit plans [Abstract]

Net defined benefit liability (asset)

(1) The net defined benefit liability(asset) is as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Defined benefit obligation		984,381			1,071,170
Fair value of plan assets		(990,653	)		(1,027,906	)
Net defined benefit liability(asset)		(6,272	)		43,264

Schedule of defined benefit liability asset by major subsidiaries [Table Text Block]

The details of the net defined benefit liability (asset) per major subsidiaries as of December 31, 2017 is as follows:

	Woori Bank Co, Ltd.		Woori Card		Woori FIS		Others		Total
Net Defined Benefit Asset				1,487						1,487
Net Defined Benefit Liability(*)		14,284				28,883		1,584		44,751

(*) This number is before adjusting for internal transaction. As most entities other than Woori Bank Co, Ltd, deposit their plan asset to Woori Bank, adjusting internal transaction, the Group’s plan asset should be decreased by 43,113 million Won.

Changes in the carrying value of defined benefit obligation

(2) Changes in the carrying value of defined benefit obligation are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		683,961			901,219			984,381
Current service cost		132,710			153,660			146,750
Interest expense		21,377			24,326			26,629
Remeasurements		97,730			(52,402	)		(20,389	)
Foreign currencies translation adjustments		(8	)		80			(279	)
Retirement benefit paid		(26,516	)		(34,346	)		(55,552	)
Curtailment or settlement		(8,231	)		(9,536	)		(10,928	)
Others		196			1,380			558
Ending balance		901,219			984,381			1,071,170

Changes in the plan assets

(3) Changes in the plan assets are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		608,370			801,528			990,653
Interest income		21,965			25,038			30,601
Remeasurements		(5,444	)		(7,304	)		(14,125	)
Employer’s contributions		229,069			226,752			43,114
Retirement benefit paid		(22,860	)		(33,341	)		(51,877	)
Curtailment or liquidation		(8,240	)		(9,198	)		(11,052	)
Others		(21,332	)		(12,822	)		40,592
Ending balance		801,528			990,653			1,027,906

Analysis for the maturity which is not discounted of the defined benefit obligation of the Bank based on current wages

(6) The analysis for the maturity, which is not discounted, of the defined benefit obligation of the Bank based on current wages is as following(Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Less than 1 year		48,132		53,718
1 year ~ less than 2 years		60,316		70,962
2 years ~ less than 5 years		159,238		156,561
5 years ~ less than 10 years		214,650		258,642
More than 10 years		436,417		449,738

As of December 31, 2017, the estimated average period until the commencement of payment is around 12.7 years.

Schedule of defined benefit plan amounts recognized in profit loss and other comprehensive income loss [Table Text Block]

(7) Current service cost, net interest expense (income), past service cost, loss (gain) on the curtailment or settlement, and loss (gain) due to remeasurements recognized in the consolidated statements of net income and total comprehensive income are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Current service cost		132,710			153,660			146,750
Net interest income		(588	)		(712	)		(3,972	)
Gain (loss) on the curtailment or settlement		9			(339	)		124
Cost recognized in net income		132,131			152,609			142,902
Remeasurements(*)		103,174			(45,098	)		(6,264	)
Cost recognized in total comprehensive income		235,305			107,511			136,638

(*) This is an amount before considering the tax effects.

Recognized retirement benefit service costs related to defined contribution plans are 3,623 million Won, 3,747 million Won and 3,946 million Won for the years ended December 31, 2015, 2016 and 2017, respectively.

Key actuarial assumptions used in defined benefit liability assessment

(8) Key actuarial assumptions used in defined benefit liability assessment are as follows:

	December 31, 2015	December 31, 2016	December 31, 2017
Discount rate	2.83%	2.85%	3.18%
Future wage growth rate	6.35%	6.05%	6.18%
Retirement rate	Experience rate for each employment classification	Experience rate for each employment classification	Experience rate for each employment classification
Mortality rate	Issued by Korea Insurance Development Institute	Issued by Korea Insurance Development Institute	Issued by Korea Insurance Development Institute

Sensitivity to actuarial assumptions used in the assessment of defined benefit obligation

(9) The sensitivity to actuarial assumptions used in the assessment of defined benefit obligation is as follows (Unit: Korean Won in millions):

		Change of defined benefit obligation as of
		December 31, 2016			December 31, 2017
Discount rate	Increase by 1% point		(107,203	)		(116,405	)
	Decrease by 1% point		125,395			137,151
Future wage growth rate	Increase by 1% point		124,766			136,707
	Decrease by 1% point		(108,344	)		(117,765	)

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Other Financial Liabilities and Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Miscellaneous Liabilities [Abstract]

Schedule of miscellaneous other liabilities [Table Text Block]

Other financial liabilities and other liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Other financial liabilities:
Account payable		5,626,661			4,692,320
Accrued expenses		2,055,936			2,049,861
Borrowings from trust accounts		3,329,683			3,271,817
Agency business revenue		331,159			344,591
Foreign exchange payables		702,968			590,667
Domestic exchange payables		8,480,765			1,309,646
Other miscellaneous financial liabilities		1,458,747			1,635,156
Present value discount		(833	)		(1,597	)
Sub-total		21,985,086			13,892,461
Other liabilities:
Unearned Income		171,050			180,664
Other miscellaneous liabilities		128,326			103,317
Sub-total		299,376			283,981
Total		22,284,462			14,176,442

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Derivatives (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of detailed information about hedges [Abstract]

Details of derivative assets and derivative liabilities

(1) Derivative assets and derivative liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016
			Assets				Liabilities
	Notional amount		Fair value hedge		For trading		Fair value hedge		For trading
Interest rate:
Futures		54,785		—		—		—		—
Swaps		118,582,511		139,832		470,057		7,013		509,686
Purchase options		860,000		—		21,172		—		—
Written options		1,035,000		—		—		—		21,863
Currency:
Futures		493,733		—		—		—		—
Forwards		62,539,094		—		1,265,852		—		1,015,380
Swaps		39,782,049		—		1,022,969		—		1,221,959
Purchase options		1,120,949		—		42,126		—		—
Written options		907,211		—		—		—		8,589
Equity:
Futures		926,392		—		—		—		—
Swaps		15,000		—		92		—		88
Purchase options		3,007,969		745		73,261		—		—
Written options		4,460,233		—		—		208		228,900
Others:
Futures		5,105		—		—		—		—
Swaps		7,918		—		2,645		—		2,331
Purchase options		8,307		—		121		—		—
Written options		64,352		—		—		—		1,181
Total		233,870,608		140,577		2,898,295		7,221		3,009,977

	December 31, 2017
			Assets						Liabilities
	Nominal amount		For cash flow hedge		For fair value hedge		For trading		For cash flow hedge		For fair value hedge		For trading
Interest rate:
Futures		75,845		—		—		—		—		—		—
Swaps		130,197,378		—		59,272		223,935		—		12,103		253,972
Purchase options		630,000		—		—		12,346		—		—		—
Written options		795,000		—		—		—		—		—		12,869
Currency:
Futures		318,217		—		—		—		—		—		—
Forwards		72,526,956		—		—		1,314,369		—		—		1,375,799
Swaps		48,176,306		—		—		1,352,924		55,651		—		1,347,905
Purchase options		2,291,154		—		—		64,267		—		—		—
Written options		4,038,237		—		—		—		—		—		58,687
Equity:
Futures		91,436		—		—		—		—		—		—
Swaps		15,000		—		—		103		—		—		10
Purchase options		5,060,706		—		—		146,775		—		—		—
Written options		4,504,290		—		—		—		—		—		99,770
Others:
Futures		—		—		—		—		—		—		—
Swaps		7,805		—		—		1,056		—		—		1,037
Purchase options		—		—		—		—		—		—		—
Written options		5,000		—		—		—		—		—		100
Total		268,733,330		—		59,272		3,115,775		55,651		12,103		3,150,149

Derivatives held for trading purpose are classified into financial assets or liabilities at FVTPL (see Notes 7 and 20) and derivatives for hedging are stated as a separate line item in the consolidated statements of financial position.

Gains and losses from fair value hedge [Table Text Block]

(2) Gains or losses from valuation of financial instruments under hedge accounting are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Gains or losses from hedged items		(31,297	)		98,827			110,152
Gains or losses from hedging instruments		38,021			(98,851	)		(109,447	)

The maximum period that the Group is exposed to cash flow risk arising from the hedging transaction discussed above will be terminated by February 2021.

Among gain (loss) on valuation of derivatives that was included in the accumulated other comprehensive income, 56,676 million Won has been reclassified to loss, before reduction of income tax effect for the year ended December 31, 2017.

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Deferred Day 1 Profit or Loss (Tables)

12 Months Ended

Dec. 31, 2017

Deferred Day One Profit Or Loss [Abstract]

Changes in deferred day one profits or losses [Table Text Block]

Changes in details of deferred day 1 profits or losses are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015			For the year ended December 31, 2016			For the year ended December 31, 2017
Beginning balance		13,499			28,008			13,422
Acquisitions		26,762			1,337			500
Amounts recognized in profits or losses		(12,253	)		(15,923	)		(6,506	)
Ending balance		28,008			13,422			7,416

In case some variables to measure fair values of financial instruments were not observable or available in the market, valuation techniques were utilized to evaluate such financial instruments. Those financial instruments were recorded at the fair value produced by the valuation techniques as at the time of acquisition, even though there were difference noted between the transaction price and the fair value. The table above presents the difference yet to be realized as profit or losses.

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Capital Stock and Capital Surplus (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Issued Capital And Miscellaneous Equity [Abstract]

Number of authorized shares and others

(1) The number of authorized shares and others are as follows:

	December 31, 2016	December 31, 2017
Authorized shares of common stock	5,000,000,000 Shares	5,000,000,000 Shares
Par value	5,000 Won	5,000 Won
Issued shares of common stock	676,000,000 Shares	676,000,000 Shares
Capital stock	3,381,392 million Won	3,381,392 million Won

Changes in numbers of issued shares of common stock

(2) Changes in numbers of issued shares of common stock are as follows (Unit: Shares):

	December 31, 2015			December 31, 2016		December 31, 2017
Beginning balance		676,278,371			676,000,000		676,000,000
Retirement of treasury stock		(278,371	)		—		—
Ending balance		676,000,000			676,000,000		676,000,000

Disclosure of issued capital and capital surplus [Table Text Block]

(3) Details of capital surplus are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Capital in excess of par value		269,533		269,533
Other capital surplus		16,798		16,347
Total		286,331		285,880

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Hybrid Securities (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Other Equity Interest [Abstract]

Schedule of other equity interest [Table Text Block]

The bond-type hybrid securities classified as owner’s equity are as follows (Unit: Korean Won in millions):

	Issue date	Maturity	Interest rate (%)		December 31, 2016			December 31, 2017
Securities in local currency	June 20, 2008	June 20, 2038		7.7		255,000			255,000
	March 8, 2012	March 8, 2042		5.8		190,000			—
	April 25, 2013	April 25, 2043		4.4		500,000			500,000
	November 13, 2013	November 13, 2043		5.7		200,000			200,000
	December 12, 2014	December 12, 2044		5.2		160,000			160,000
	June 3, 2015	June 3, 2045		4.4		240,000			240,000
Securities in foreign currencies	May 2, 2007	May 2, 2037		6.2		930,900			—
	June 10, 2015	June 10, 2045		5.0		559,650			559,650
	September 27, 2016	—		4.5		553,450			553,450
	May 16, 2017	—		5.3		—			562,700
Issuance cost						(14,104	)		(12,912	)
Total						3,574,896			3,017,888

The hybrid securities mentioned above are either without a maturity date or its maturity can be extended indefinitely at the maturity date without change of terms. Further, if a resolution is passed not to pay dividends on common stock, interest payments on the hybrid securities may be skipped.

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Other Equity (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Other Equity [Abstract]

Details of other equity

(1) Details of other equity are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Other comprehensive income:
Gain on valuation of AFS financial assets		386,981			301,930
Share of other comprehensive loss of joint ventures and associates		(1,863	)		(1,251	)
Loss on foreign currencies translation for foreign operations		(48,353	)		(242,700	)
Remeasurement of the net defined benefit liability		(163,397	)		(152,624	)
Gain on valuation of cash flow hedges		—			777
Equity related to current assets held for sale		—			4,145
Sub-total		173,368			(89,723	)
Treasury shares		(34,113	)		(34,113	)
Other capital adjustments		(1,607,280	)		(1,815,438	)
Total		(1,468,025	)		(1,939,274	)

Reconciliation of changes in accumulated other comprehensive income [Table Text Block]

(2) Changes in the accumulated other comprehensive income are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Beginning balance			Increase (decrease) on valuation			Reclassification(*)			Income tax effect			Ending balance
Gain (loss) on valuation of available-for-sale financial assets		300,994			190,842			(101,439	)		(15,712	)		374,685
Share of other comprehensive income (loss) of joint ventures and associates		2,779			4,409			—			(1,114	)		6,074
Gain (loss) on foreign currency translation of foreign operations		(107,721	)		49,421			—			(12,489	)		(70,789	)
Remeasurement of the net defined benefit liability		(119,375	)		(102,467	)		—			24,263			(197,579	)
Loss on valuation of cash flow hedges		(10,371	)		—			—			—			(10,371	)
Total		66,306			142,205			(101,439	)		(5,052	)		102,020

	For the year ended December 31, 2016
	Beginning balance			Increase (decrease) on valuation			Reclassification(*)			Income tax effect			Ending balance
Gain (loss) on valuation of available-for-sale financial assets		374,685			114,617			(101,647	)		(674	)		386,981
Share of other comprehensive income (loss) of joint ventures and associates		6,074			(9,274	)		—			1,337			(1,863	)
Gain (loss) on foreign currency translation of foreign operations		(70,789	)		30,368			—			(7,932	)		(48,353	)
Remeasurement of the net defined benefit liability		(197,579	)		45,096			—			(10,914	)		(163,397	)
Gain (loss) on valuation of cash flow hedges		(10,371	)		10,371			—			—			—
Total		102,020			191,178			(101,647	)		(18,183	)		173,368

	For the year ended December 31, 2017
	Beginning balance			Increase (decrease) on valuation			Reclassification(*)			Income tax effect			Ending balance
Gain (loss) on valuation of available-for-sale financial assets		386,981			80,997			(164,803	)		(1,245	)		301,930
Share of other comprehensive income (loss) of joint ventures and associates		(1,863	)		2,516			—			(1,904	)		(1,251	)
Loss on foreign currency translation of foreign operations		(48,353	)		(193,272	)		—			(1,075	)		(242,700	)
Remeasurement gain (loss) related to defined benefit plan		(163,397	)		6,216			—			4,557			(152,624	)
Gain (loss) on valuation of cash flow hedges		—			1,025			—			(248	)		777
Transfer to non-current assets held for sale		—			4,145			—			—			4,145
Total		173,368			(98,373	)		(164,803	)		85			(89,723	)

(*) For the change in gain (loss) on valuation of AFS financial assets, “reclassification” is disposal or recognition of impairment losses on AFS financial assets.

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Retained Earnings (Tables)

12 Months Ended

Dec. 31, 2017

Retained Earnings Note Disclosure [Abstract]

Schedule of appropriated and unappropriated retained earnings [Table Text Block]

(1) Details of retained earnings are as follows (Unit: Korean Won in millions):

		December 31, 2016		December 31, 2017
Legal reserve	Earned surplus reserve		1,622,754		1,729,754
	Other legal reserve		44,634		45,668
	Sub-total		1,667,388		1,775,422
Voluntary reserve	Business rationalisation reserve		8,000		8,000
	Reserve for financial structure improvement		235,400		235,400
	Additional reserve		7,073,104		7,418,806
	Regulatory reserve for credit loss		2,255,252		2,438,191
	Revaluation reserve		753,908		751,964
	Other voluntary reserve		11,700		11,700
	Sub-total		10,337,364		10,864,061
Retained earnings before appropriation			2,606,814		2,980,523
	Total		14,611,566		15,620,006

Changes in retained earnings [Table Text Block]

(2) Changes in retained earnings are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Beginning balance		14,165,358			13,726,122			14,611,566
Net income attributable to owners		1,059,157			1,261,266			1,512,148
Dividends on common stock		(504,952	)		(168,317	)		(336,636	)
Dividends on hybrid securities		(183,320	)		(206,515	)		(167,072	)
Appreciation of merger losses		(806,640	)		—			—
Repayment of hybrid securities		—			(990	)		—
Retirement of treasury stock		(3,481	)		—			—
Ending balance		13,726,122			14,611,566			15,620,006

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Regulatory Reserve for Credit Loss (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Regulatory Capital Requirements Under Regulation On Supervision Of Banking Business [Abstract]

Schedule of regulatory capital requirements under regulation on supervision of banking business [Table Text Block]

(1) Balance of the planned regulatory reserve for credit loss is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2016		2017
Beginning balance		2,255,252		2,438,191
Planned provision of regulatory reserve for credit loss		182,939		140,266
Ending balance		2,438,191		2,578,457

Adjustments of regulatory reserves on net income and earnings per share [Table Text Block]

(2) Planned reserves provided, adjusted net income after the planned reserves provided and adjusted earnings per share after the planned reserves provided are as follows (Unit: Korean Won in millions, except for earnings per share amount):

	For the years ended December 31
	2015		2016		2017
Net income		1,075,392		1,277,533		1,530,088
Provision of regulatory reserve for credit loss		499,110		182,939		140,266
Adjusted net income after the provision of regulatory reserve		576,282		1,094,594		1,389,822
Adjusted EPS after the provision of regulatory reserve (Unit: Korean Won)		584		1,320		1,817

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Net Interest Income (Tables)

12 Months Ended

Dec. 31, 2017

Interest Revenue (Expense), Net [Abstract]

Details of interest income

(1) Interest income recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Financial assets at FVTPL		63,143		63,408		53,348
AFS financial assets		389,443		339,518		239,030
HTM financial assets		418,065		360,054		307,965
Loans and receivables:
Interest on due from banks		81,117		75,021		83,325
Interest on loans		7,700,475		7,635,791		7,835,957
Interest of other receivables		45,992		38,520		31,062
Sub-total		7,827,584		7,749,332		7,950,344
Total		8,698,235		8,512,312		8,550,687

Details of interest expense

(2) Interest expense recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Interest on deposits due to customers		2,888,529		2,547,142		2,380,263
Interest on borrowings		216,743		215,240		238,212
Interest on debentures		707,772		619,255		638,653
Interest expense on others		123,291		111,131		72,909
Total		3,936,335		3,492,768		3,330,037

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Net Fees and Commissions Income (Tables)

12 Months Ended

Dec. 31, 2017

Fee and commission income (expense) [Abstract]

Schedule of fee and commission income [Table Text Block]

(1) Fees and commissions income recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Banking fees(*)		676,114		660,556		673,582
Guarantee fees		78,922		66,549		65,779
Fees from project financing		15,521		20,213		13,394
Credit card fees		852,250		954,502		1,072,423
Brokerage fees		67,692		70,928		80,872
Others		66,841		92,722		163,148
Total		1,757,340		1,865,470		2,069,198

(*) Banking fees include agency commission, fees income from electronic finance, fees income related to loan, fees for import letter of credit dealing, commission received on foreign exchange and others.

Schedule of fee and commission expense [Table Text Block]

(2) Fees and commissions expense incurred is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Fees paid		133,909		162,170		164,834
Credit card commissions		643,524		760,913		828,363
Brokerage commissions		615		739		558
Others		2,496		4,517		4,977
Total		780,544		928,339		998,732

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Dividend Income (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Revenue From Dividends [Abstract]

Schedule of revenue from dividends [Table Text Block]

Dividend income recognized is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Dividend from financial assets at FVTPL		1,217		996		446
Dividend from AFS financial assets		101,706		183,514		124,546
Total		102,923		184,510		124,992

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Gains (Losses) on Financial Assets at Fair Value Through Profit or Loss (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Gains Losses On Financial Instruments At Fair Value Through Profit Or Loss [Abstract]

Schedule of gains losses on financial instruments at fair value through profit or loss [Table Text Block]

37. GAINS (LOSSES) ON FINANCIAL ASSETS AT FVTPL

(1) Details of gains or losses related to financial assets at FVTPL are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016			2017
Gains on financial assets held for trading		171,137		185,786			6,123
Gains (losses) of financial assets designated at FVTPL		69,205		(71,399	)		(110,950	)
Total		240,342		114,387			(104,827	)

Schedule of gains losses on financial instruments held for trading [Table Text Block]

(2) Gains (losses) on financial assets held for trading are as follows (Unit: Korean Won in millions):

			For the years ended December 31
			2015			2016			2017
Financial Assets at FVTPL	Securities	Gain on valuation		7,735			9,323			2,764
		Gain on disposals		32,780			24,509			20,528
		Loss on valuation		(13,663	)		(12,681	)		(13,757	)
		Loss on disposals		(22,771	)		(11,524	)		(6,466	)
		Sub-total		4,081			9,627			3,069
	Other financial assets	Gain on valuation		10,195			13,628			6,524
		Gain on disposals		442			2,404			2,353
		Loss on valuation		(10,189	)		(14,033	)		(7,885	)
		Loss on disposals		(208	)		(1,644	)		(619	)
		Sub-total		240			355			373
	Total			4,321			9,982			3,442
Derivatives (for trading)	Interest rates derivatives	Gain on transactions and valuation		1,240,353			1,423,606			1,088,192
		Loss on transactions and valuation		(1,251,673	)		(1,401,582	)		(1,043,312	)
		Sub-total		(11,320	)		22,024			44,880
	Currencies derivatives	Gain on transactions and valuation		4,241,317			5,804,420			7,253,426
		Loss on transactions and valuation		(3,987,856	)		(5,683,357	)		(7,408,741	)
		Sub-total		253,461			121,063			(155,315	)
	Equity derivatives	Gain on transactions and valuation		92,400			293,657			511,220
		Loss on transactions and valuation		(166,528	)		(259,280	)		(397,462	)
		Sub-total		(74,128	)		34,377			113,758
	Other derivatives	Gain on transactions and valuation		54,322			50,139			4,056
		Loss on transactions and valuation		(55,519	)		(51,799	)		(4,698	)
		Sub-total		(1,197	)		(1,660	)		(642	)
	Total			166,816			175,804			2,681
	Total			171,137			185,786			6,123

Schedule of gains losses on financial instruments designated at fair value through profit or loss [Table Text Block]

(3) Gains (losses) on financial assets designated at FVTPL are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Gain (loss) on equity-linked securities:
Gain (loss) on disposals of equity-linked securities		(22,363	)		(24,165	)		(79,965	)
Gain (loss) on valuation of equity-linked securities		89,863			(52,007	)		(32,511	)
Sub-total		67,500			(76,172	)		(112,476	)
Gain (loss) on securities:
Gain (loss) on disposals of securities		(62	)		14			—
Gain on valuation of securities		1,027			882			290
Sub-total		965			896			290
Gain on other financial instruments:
Gain on valuation of other financial instruments		740			3,877			1,236
Total		69,205			(71,399	)		(110,950	)

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Net Loss on Available For Sale Financial Assets (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of gains losses recognised in profit or loss available-for-sale securities [Abstract]

Gains losses recognised in profit or loss available-for-sale financial assets [Table Text Block]

Gains (losses) on AFS financial are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Gains on redemption of securities		1,089			721			47
Gains on transaction of securities		130,457			47,985			223,961
Impairment losses on securities		(134,827	)		(49,741	)		(31,300	)
Total		(3,281	)		(1,035	)		192,708

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Impairment Losses Due to Credit Loss (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of impairment loss and reversal of impairment loss [Abstract]

Impairment losses on loans and receivables guarantees and loan commitment recognized for credit loss

39. IMPAIRMENT LOSSES DUE TO CREDIT LOSS

Impairment losses on loans and receivables, guarantees and loan commitment recognized for credit loss are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Provision due to credit loss		(1,112,139	)		(890,763	)		(862,273	)
Reversal of provision on/(provision for) guarantees		140,318			59,780			55,424
Reversal of provision on/(provision for) loan commitment		5,175			(3,093	)		21,716
Total		(966,646	)		(834,076	)		(785,133	)

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General, Administrative, and Other Net Operating Incomes (Expenses) (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of General And Administrative Expense And Other Net Operating Income Expense [Abstract]

Details of administrative expenses

(1) Administrative expenses recognized are as follows (Unit: Korean Won in millions):

			For the years ended December 31
			2015		2016		2017
Employee benefits	Short term	Salaries		1,262,786		1,323,007		1,317,826
	employee benefits	Others		381,283		466,585		559,562
	Retirement benefit service costs(*)			135,754		156,356		146,848
	Termination			73,119		179,286		299,562
	Sub-total			1,852,942		2,125,234		2,323,798
Depreciation and amortization				236,958		248,269		183,601
Other general and administrative expenses	Rent			295,871		311,992		313,080
	Taxes and dues			103,580		102,531		111,248
	Service charges			233,860		244,543		198,828
	IT expenses			100,026		83,978		70,936
	Telephone and communication expenses			60,880		63,699		65,015
	Operating promotion expenses			46,638		48,115		43,850
	Advertising			58,914		76,153		68,942
	Printing			10,249		9,502		8,633
	Traveling expenses			9,601		11,681		13,064
	Supplies			6,822		6,827		6,795
	Insurance premium			7,236		8,092		8,548
	Reimbursement			23,779		26,846		27,516
	Maintenance			14,565		16,470		16,081
	Water, light and heating			15,205		15,006		14,165
	Vehicle maintenance			10,400		9,987		9,902
	Others			62,861		69,551		46,799
	Sub-total			1,060,487		1,104,973		1,023,402
	Total			3,150,387		3,478,476		3,530,801

(*) This includes the amount the Group paid for the Defined Contribution type pension plan of 3,946 million Won in addition to the expenses related to the Defined Benefit type pension plan of 142,902 million Won for the year ended December 31, 2017. For the details, please see Note 24 (7).

Schedule of other operating income [Table Text Block]

(2) Other operating incomes recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Gains on transaction of foreign exchange		3,352,318		4,791,772		3,391,095
Gains on disposal of loans and receivables		186,939		204,239		205,490
Gains on transactions of derivatives		59,003		130		122
Gains on fair value hedged items		25,235		99,302		53,532
Others(*)		158,806		112,079		86,159
Total		3,782,301		5,207,522		3,736,398

(*) Others include such incomes amounting to 137,187 million Won, 74,700 million Won and 29,336 million Won for the year ended December, 2015, 2016 and 2017, respectively, that the Group recognized for it is to receive from other creditor financial institutions in accordance with the creditor financial institutions committee agreement.

Schedule of other operating expense [Table Text Block]

(3) Other operating expenses recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Losses on transaction of foreign exchange		3,429,638		4,706,055		2,886,535
KDIC deposit insurance fees		266,031		298,804		304,055
Contribution to miscellaneous funds		343,703		295,601		286,000
Losses on disposal of loans and receivables		43,266		4,265		9,221
Losses related to derivatives		20,982		98,981		109,569
Losses on fair value hedged items		56,532		475		—
Others(*)		232,210		171,120		172,331
Total		4,392,362		5,575,301		3,767,711

(*) Others include such expenses amounting to 154,897 million Won, 109,063 million Won and 5,237 million Won for the year ended December 31, 2015, 2016 and 2017, respectively, that the Group recognized for it is to carry out a payment to other creditor financial institutions in accordance with the creditor financial institutions committee agreement. In addition, other expense for the year ended December 31, 2017 includes 48,292 million Won of intangible asset amortization expense.

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Other Net Non Operating Income (Tables)

12 Months Ended

Dec. 31, 2017

Other Nonoperating Income (Expense) [Abstract]

Share of profit loss of associates and joint ventures accounted for using equity method [Table Text Block]

(1) Details of gain or loss on valuation of investments in joint ventures and associates are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Gain on valuation		41,363			36,757			83,506
Loss on valuation		(55,176	)		(55,091	)		(70,117	)
Impairment loss		(56,311	)		(1,173	)		(114,903	)
Total		(70,124	)		(19,507	)		(101,514	)

Other non operating incomes and expenses

(2) Other non-operating income and expense recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Other non-operating income		272,610			132,272			84,361
Other non-operating expense		(102,126	)		(133,582	)		(190,083	)
Total		170,484			(1,310	)		(105,722	)

Schedule of other non-operating income [Table Text Block]

(3) Other non-operating incomes recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Rental fee income		8,225		7,291		6,973
Gains on disposal of investment in joint ventures and associates		61,653		23,457		39,932
Gains on disposal of premises and equipment and other assets		6,814		1,885		5,028
Reversal of impairment loss on premises and equipment and other assets		539		3,581		666
Others(*)		195,379		96,058		31,762
Total		272,610		132,272		84,361

(*) Others include the receipt of guaranteed payment, which was amounting to 132,784 million Won, during the year ended December 31, 2015 that the Group received in accordance with the final irrevocable verdict for the payment of commitment (Note 44).

Schedule of other non-operating expense [Table Text Block]

(4) Other non-operating expenses recognized are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015		2016		2017
Depreciation on investment properties		3,806		3,762		3,902
Interest expenses of rent leasehold deposits		688		496		459
Losses on disposal of investment in joint ventures and associates		10		15,060		38,713
Losses on disposal of premises and equipment and other assets		2,707		9,718		9,994
Impairment losses on premises and equipment and other assets		2,990		1,936		390
Donation		46,266		43,939		98,132
Others		45,659		58,671		38,493
Total		102,126		133,582		190,083

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Income Tax Expense (Tables)

12 Months Ended

Dec. 31, 2017

Major components of tax expense (income) [Abstract]

Details of income tax expenses

(1) Income tax expenses are as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Current tax expense
Current tax expense in respect of the current year		362,552			332,996			471,669
Adjustments recognized in the current period in relation to the current tax of prior periods		(27,038	)		(22,138	)		(5,209	)
Sub-total		335,514			310,858			466,460
Deferred tax expense
Deferred tax expense (benefit) relating to the origination and reversal of temporary differences		44,884			(18,766	)		(47,464	)
Less: Deferred tax charged directly to other comprehensive income		(3,844	)		(16,236	)		422
Sub-total		41,040			(35,002	)		(47,042	)
Income tax expense		376,554			275,856			419,418

Relationship between net income loss before income tax expense and Income tax expense benefit

(2) Income tax expense (benefit) can be reconciled to net income (loss) before income tax expense as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015			2016			2017
Net income before income tax expense		1,451,946			1,553,389			1,949,506
Income from continuing operations before income tax		1,451,946			1,553,389			1,949,506
Tax calculated at statutory tax rate(*)		350,909			375,458			471,318
Adjustments
Effect of income that is exempt from taxation		(56,247	)		(75,166	)		(55,983	)
Effect of expense that is not deductible in determining taxable profit		50,152			13,664			22,254
Adjustments recognized in the current period in relation to the current tax of prior periods		(27,038	)		(22,138	)		(5,209	)
Effect on deferred tax balances due to the change in income tax rate from 24.2% to 27.5% (effective January 1, 2018)		—			—			(35,987	)
Others		58,778			(15,962	)		23,025
Sub-total		25,645			(99,602	)		(51,900	)
Income tax expense		376,554			275,856			419,418
Effective tax rate
		25.93	%		17.76	%		21.51	%

(*) Applicable income tax rate; 1) 11% for below 200 million Won, 2) 22% for from 200 million Won to 20 billion Won, 3) 24.2% for above 20 billion Won.

Schedule of changes in deferred tax assets and liabilities [Table Text Block]

(3) Deferred tax assets and liabilities are as follows (Unit: Korean Won in millions):

	For the year ended December 31, 2015
	Beginning balance (*1)			Recognized as income (loss)			Recognized as other comprehensive income (loss)			Ending balance
Gain (loss) on financial assets at FVTPL		422,910			22,819			—			445,729
Gain (loss) on available-for-sale financial assets		(105,556	)		94			(16,074	)		(121,536	)
Gain (loss) on valuation using the equity method of accounting		21,156			(14,936	)		(1,114	)		5,106
Gain (loss) on valuation of derivatives		(48,438	)		8,664			—			(39,774	)
Accrued income		(75,094	)		(7,054	)		—			(82,148	)
Allowance for loan loss		(59,428	)		8,924			—			(50,504	)
Loan and receivables written off		6,921			47,304			—			54,225
Loan origination costs and fees		(88,476	)		(15,436	)		—			(103,912	)
Defined benefit liability		151,666			26,912			24,845			203,423
Deposits with employee retirement insurance trust		(135,474	)		(51,570	)		—			(187,044	)
Provision for guarantee		84,530			(15,305	)		—			69,225
Other provision		37,029			(9,131	)		—			27,898
Others		24,355			(42,324	)		(11,501	)		(29,470	)
Net deferred tax assets		236,101			(41,039	)		(3,844	)		191,218

	For the year ended December 31, 2016
	Beginning balance			Recognized as income (loss)			Recognized as other comprehensive income (loss)			Ending balance
Gain on financial assets at FVTPL		445,729			(18,524	)		—			427,205
Gain (loss) on AFS financial assets		(121,536	)		57			(666	)		(122,145	)
Gain (loss) on valuation using the equity method of accounting		5,106			26,500			1,337			32,943
Gain (loss) on valuation of derivatives		(39,774	)		(4,079	)		—			(43,853	)
Accrued income		(82,148	)		12,188			—			(69,960	)
Provision for loan losses		(50,504	)		3,693			—			(46,811	)
Loan and receivables written off		54,225			(310	)		—			53,915
Loan origination costs and fees		(103,912	)		(4,190	)		—			(108,102	)
Defined benefit liability		203,423			32,536			(10,914	)		225,045
Deposits with employee retirement insurance trust		(187,044	)		(39,277	)		—			(226,321	)
Provision for guarantee		69,225			(28,087	)		—			41,138
Other provision		27,898			4,494			—			32,392
Others		(29,470	)		50,001			(5,993	)		14,538
Net deferred tax assets		191,218			35,002			(16,236	)		209,984

(*1) The beginning balance incorporates the deferred tax assets (liabilities) from subsidiaries that were reclassified into disposal group held for sale and disposal groups held for distribution to owners.

	For the year ended December 31, 2017
	Beginning balance			Recognized as income (expense)			Recognized as other comprehensive income (expense)			Ending balance
Gain on financial assets at FVTPL		427,205			70,996			—			498,201
Gain (loss) on AFS financial assets		(122,145	)		1,011			(1,008	)		(122,142	)
Gain (loss) on valuation using the equity method of accounting		32,943			(6,473	)		(1,904	)		24,566
Gain (loss) on valuation of derivatives		(43,853	)		33,806			(248	)		(10,295	)
Accrued income		(69,960	)		8,972			—			(60,988	)
Provision for loan losses		(46,811	)		(886	)		—			(47,697	)
Loan and receivables written off		53,915			(44,138	)		—			9,777
Loan origination costs and fees		(108,102	)		(29,218	)		—			(137,320	)
Defined benefit liability		225,045			54,533			4,656			284,234
Deposits with employee retirement insurance trust		(226,321	)		(61,012	)		—			(287,333	)
Provision for guarantee		41,138			(10,536	)		—			30,602
Other provision		32,392			12,761			—			45,153
Others(*2)		14,538			17,227			(1,074	)		30,691
Net deferred tax assets		209,984			47,043			422			257,449

(*2) Among the deferred tax assets and liabilities classified as ‘Others,’ the deferred tax asset arising from accumulated deficit amounts to 15,652 million Won.

Unrecognized temporary differences

(4) Unrecognised temporary differences are as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Deductible temporary differences(*)		59,803			126,818
Unused tax losses		192,138			96,135
Taxable temporary differences(*)		(1,263,200	)		(1,298,586	)
Total		(1,011,259	)		(1,075,633	)

(*) The amounts in the tabular disclosure at 31 December 2016 have been restated by (164,649) million Won relating to Deductible temporary differences and (394,659) million Won relating to Taxable temporary differences, respectively, due to an error in the previous year’s disclosure.

Total

(5) Deferred tax charged directly to other comprehensive income is as follows (Unit: Korean Won in millions):

	December 31, 2016			December 31, 2017
Loss on available-for-sale financial assets		(113,161	)		(114,169	)
Share of other comprehensive gain (loss) of jointly controlled entities and associates		950			(954	)
Gain on foreign currency translation of foreign operations		16,930			15,855
Remeasurements		51,661			56,317
Loss on valuation of cash flow hedges		—			(248	)
Total		(43,620	)		(43,199	)

Schedule of current tax assets and liabilities [Table Text Block]

(6) Current tax assets and liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Current tax assets		6,229		4,722
Current tax liabilities		171,192		232,600

Deferred tax assets and liabilities

(7) Deferred tax assets and liabilities are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Deferred tax assets		232,007		280,130
Deferred tax liabilities		22,023		22,681
Net deferred tax assets		209,984		257,449

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Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings per share [Abstract]

Details of earnings per share

Basic EPS is calculated by dividing net income by weighted average number of common shares outstanding (Unit: Korean Won in millions except for EPS and number of shares):

	For the years ended December 31
	2015			2016			2017
Net income attributable to common shareholders		1,059,157			1,261,266			1,512,148
Dividends to hybrid securities		(183,320	)		(206,515	)		(167,072	)
Net income attributable to common shareholders		875,837			1,054,751			1,345,076
Weighted average number of common shares outstanding		673 million shares			673 million shares			673 million shares
Basic Earnings Per Share		1,301			1,567			1,999

Diluted EPS is equal to basic EPS because there is no dilution effect for the year ended December 31, 2015, 2016 and 2017.

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Contingent Liabilities and Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of contingent liabilities [Abstract]

Details of guarantees

(1) Details of guarantees are as follow (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Confirmed guarantees
Guarantee for loans		79,566		157,299
Acceptances		504,354		320,519
Letters of guarantees		97,606		108,238
Other confirmed guarantees		7,588,661		6,288,965
Total		8,270,187		6,875,021
Unconfirmed guarantees
Local letter of credit		397,588		383,117
Letter of credit		3,844,345		3,637,787
Other unconfirmed guarantees		859,768		505,689
Total		5,101,701		4,526,593
CP purchase commitments and others		1,389,896		1,458,101

Details of loan commitments and others

(2) Details of loan commitments and others are as follow (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
Loan commitments		83,795,496		80,760,325
Other commitments		4,840,593		4,546,090

Litigation case [Table Text Block]

(3) Litigation case

The Group had filed lawsuits as follows (Unit: Korean Won in millions except for number of cases):

	December 31, 2016				December 31, 2017
	As plaintiff		As defendant		As plaintiff		As defendant
Number of cases		88 cases		175 cases		83 cases		155 cases
Amount of litigation		308,848		246,465		413,267		244,767
Allowance for litigations				5,946				9,277

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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of transactions between related parties [Abstract]

Schedule of related party [Table Text Block]

(1) Related parties

Related parties
Associates	Kumho Tires Co., Inc., Woori Service Networks Co., Ltd., Korea Credit Bureau Co., Ltd., Korea Finance Security Co., Ltd., Chin Hung International Inc., Poonglim Industrial Co., Ltd., STX Engine Co., Ltd, STX Corporation, 2016KIF-IMM Woori Bank Technology Venture Fund, K BANK Co., Ltd., Well to Sea No. 3 Private Equity Fund, and Others (Dongwoo C & C Co., Ltd. and other 22 associates)

Schedule of due from to related party [Table Text Block]

(2) Assets and liabilities from transactions with related parties are as follows (Unit: Korean Won in millions):

Related party		A title of account	December 31, 2016			December 31, 2017
Corporation that have significant influence over the Group	KDIC(*1)	Loans		9			—
		Other assets		270,041			—
		Deposits due to customers		1,894,631			—
		Other liabilities		15,568			—
Associates	Kumho Tires Co., Inc.	Loans		299,523			170,917
		Allowance for credit loss		(715	)		(156,712	)
		Deposits due to customers		45,957			666
		Other liabilities		50			50
	Woori Blackstone Korea Opportunity Private Equity Fund No.1	Other assets		34			—
		Other liabilities		306			—
	Woori Service Networks Co., Ltd.	Loans		29			45
		Deposits due to customers		2,572			1,311
		Other liabilities		393			357
	Korea Credit Bureau Co., Ltd.	Loans		2			6
		Deposits due to customers		5,069			5,586
		Other liabilities		40			54
	Korea Finance Security Co., Ltd.	Loans		55			56
		Deposits due to customers		2,801			2,854
		Other liabilities		6			7
	Chin Hung International Inc.	Loans		4,320			408
		Allowance for credit loss		(4,287	)		(22	)
		Deposits due to customers		14,047			46,220
		Other liabilities		279			1,658
	Poonglim Industrial Co., Ltd.	Deposits due to customers		283			4
	STX Engine Co., Ltd.	Loans		107,974			106,176
		Allowance for credit loss		(89,531	)		(88,734	)
		Deposits due to customers		13,260			18,092
		Other liabilities		588			29
	Samho International Co., Ltd.(*2)	Loans		37,327			—
		Allowance for credit loss		(717	)		—
		Deposits due to customers		82,917			—
		Other liabilities		216			—
	STX Corporation	Loans		144,035			47,711
		Allowance for credit loss		(92,643	)		(31,210	)
		Deposits due to customers		14,412			77,555
		Other liabilities		90			80
	K BANK Co., Ltd.	Loans		—			212
		Other assets		325			—
	Well to Sea No.3 Private Equity Fund(*3)	Loans		—			73,810
		Allowance for credit loss		—			(39	)
		Deposits due to customers		—			61
		Other liabilities		—			27
	Others(*4)	Loans		619			499
		Allowance for credit loss		(253	)		(471	)
		Other assets		8			1
		Deposits due to customers		4,460			2,906
		Other liabilities		60			73

(*1) As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been excluded from the corporation that have significant influence over the Group.

(*2) As the Group sold its entire ownership interest of the entity, it is excluded from the investment in associates during the years ended December 31, 2017.

(*3) Due to capital contribution by the Group during the years ended December 31, 2017, the entity was included in the investment in associates.

(*4) Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2016 and 2017.

Schedule of profit and loss arising from related party transactions [Table Text Block]

(3) Gain or loss from transactions with related parties are as follows (Unit: Korean Won in millions):

			For the years ended December 31
Related party		A title of account	2015			2016			2017
Corporation that have significant influence over the group	KDIC(*3)	Interest income		22,237			11,778			—
		Interest expenses		23,584			20,966			15,331
		Impairment losses due to credit loss (reversal of allowance for credit loss)		29			—			—
Associates	Kumho Tires Co., Ltd.	Interest income		2,698			2,430			2,641
		Fees income		6			6			5
		Interest expenses		205			68			1
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(2,353	)		162			155,997
	Woori Blackstone Korea Opportunity Private Equity Fund No.1	Fees income		1,437			1,364			6,225
	Woori Service Networks Co., Ltd.	Other income		28			29			30
		Interest expenses		83			49			24
		Fees expenses		821			985			543
		Other expenses		228			222			507
		Impairment losses due to credit loss		2			—			—
	Korea Credit Bureau Co., Ltd.	Interest expenses		74			138			82
		Fees expenses		1,690			1,915			2,079
	Korea Finance Security Co., Ltd.	Interest expenses		39			10			12
		Fees expenses		93			110			—
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(3	)		—			—
	Chin Hung International Inc.	Interest income		807			240			364
		Fees income		1			1			1
		Interest expenses		35			28			27
		Reversal of allowance for credit loss		(534	)		(481	)		(4,265	)
	Poonglim Industrial Co., Ltd.	Interest expenses		11			2			—
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(1,565	)		(1,557	)		—
	Ansang Tech Co., Ltd.(*1)	Reversal of allowance for credit loss		(38	)		—			—
	STX Engine Co., Ltd.	Interest income		1,358			1,348			1,417
		Fees income		67			58			28
		Interest expenses		46			97			147
		Impairment losses due to credit loss		20,524			63,866			(797	)
Associates	Samho International Co., Ltd.(*4)	Interest income		1,015			916			486
		Fees income		3			5			5
		Interest expenses		981			525			334
		Reversal of allowance for credit loss		(2,098	)		(5,166	)		(717	)
	Force TEC C Co., Ltd.(*5)	Interest income		249			153			—
		Impairment losses due to credit loss (reversal of allowance for credit loss)		5,900			—			—
	Hana Engineering & Construction Co., Ltd.(*2)	Reversal of allowance for credit loss		(98	)		—			—
	STX Corporation	Interest income		1,729			1,039			219
		Fees income		89			75			30
		Interest expenses		6			7			4
		Impairment losses due to credit loss (reversal of allowance for credit loss)		(4,060	)		73,457			(61,432	)
	Osung LST Co., Ltd.(*2)	Interest income		226			170			—
		Interest expenses		16			1			—
		Reversal of allowance for credit loss		(223	)		(338	)		—
	Woori Columbus 1st Private Equity Fund	Fees income		546			308			272
	Ilyang Construction Co., Ltd.(*2)	Impairment losses due to credit loss		215			—			—
	K BANK Co., Ltd.(*6)	Fees income		—			296			—
		Other income		—			1,638			1,051
	Well to Sea No.3	Interest incomes		—			—			982
	Private Equity Fund(*7)	Interest expenses		—			—			4
		Impairment losses due to credit loss		—			—			39
	Others(*8)	Interest expenses		—			17			13
		Impairment losses due to credit loss		—			253			218

(*1) As the Group sold its ownership interests in the entities during the year ended December 31, 2015, these entities were excluded from the investment in associates.

(*2) As the Group sold its ownership interests in the entities during the year ended December 31, 2016, these entities were excluded from the investment in associates.

(*3) As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been exclude from the corporation that have significant influence over the Group.

(*4) As the Group sold its entire ownership interest of the entity, it is excluded from the investment in associates during the years ended December 31, 2017.

(*5) The entity is not in scope for the associates as of December 31, 2017, because the Group does not have significant influence over the entity due to the fact that it is going through workout process under receivership.

(*6) Due to capital contribution during the year ended December 31, 2016, the entity has been included in the investment in associates.

(*7) Due to capital contribution by the Group during the year ended December 31, 2017, the entity was included in the investment in associates.

(*8) Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2017, and Saman Corporation, Kyesan Engineering Co., Ltd., Gachi Staff Co., Ltd., QTS Shipping Co., Ltd., and others were included as of December 31, 2016, respectively.

Schedule of provision of guarantees or collateral to entity related party transactions [Table Text Block]

(4) Guarantees provided to the related parties are as follows (Unit: Korean Won in millions):

	December 31, 2016		December 31, 2017
KDIC(*1)		1,500,000		—	Loan commitment
Kumho Tires Co., Inc.		24,187		4,181	Letter of credit and others
		126,435		636	Loan commitment
Korea Finance Security Co., Ltd.		205		204	Loan commitment
Korea Credit Bureau Co., Ltd.		33		29	Loan commitment
Woori Service Networks Co., Ltd.		171		155	Loan commitment
Chin Hung International Inc.		40,904		31,891	Loan commitment
STX Engine Co., Ltd.		63,103		68,858	Letter of credit and others
		685		—	Loan commitment
SamHo Co., Ltd.(*2)		30,083		—	Loan commitment
STX corporation		24,316		17,557	Letter of credit and others
		71		53	Loan commitment
Well to Sea No.3 Private Equity Fund(*3)		—		236,190	Loan commitment

(*1) As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been exclude from the corporation that have significant influence over the Group.

(*2) As the Group sold its entire ownership interest of the entities during the year ended December 31, 2017, they are excluded from the investment in associates.

(*3) Due to capital contribution by the Group during the year ended December 31, 2017, the entity was included in the investment in associates.

For the guarantee provided to the related parties, the Group recognized provisions for guarantees amounting to 70,587 million Won and 71,459 million Won, as of December 31, 2016 and 2017, respectively.

Schedule of key management personnel compensation [Table Text Block]

(5) Compensation for key management is as follows (Unit: Korean Won in millions):

	For the years ended December 31
	2015(*)		2016		2017
Short term benefits		10,288		9,523		12,024
Severance payments		473		424		472
Total		10,761		9,947		12,496

(*) As the scope of the compensation for key management disclosure has changed, the comparative amounts are restated.

Key management includes registered executives and non-registered executives. Outstanding assets and liabilities from transactions with key management amount to 2,439 million Won and 6,309 million Won, respectively, as of December 31, 2017. With respect to the assets, the Group has not recognized any allowance, nor provision.

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Business Combination (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of detailed information about business combination [Abstract]

Acquisition accounting of business combination [Table Text Block]

(3) Acquisition accounting in 2016 (Unit: Korean Won in millions)

	Woori Wealth Bank in Philippines		Woori Bank Vietnam Limited		Total
I. Consideration
Cash and cash equivalents		25,675		155,400		181,075
II. Identifiable assets and liabilities
Cash and Cash equivalents		48,774		—		48,774
AFS financial assets		2,125		—		2,125
Loan and receivables		126,917		155,400		282,317
Property and equipment		651		—		651
Intangible assets		205		—		205
Other assets		8,792		—		8,792
Sub-total		187,464		155,400		342,864
Deposits		148,521		—		148,521
Allowance for credit losses		352		—		352
Other liabilities		3,655		—		3,655
Sub-total		152,528		—		152,528
Fair value of identifiable net asset		34,936		155,400		190,336
III. Non-controlling interest		17,118		—		17,118
IV. Goodwill		7,857		—		7,857

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General_General Information (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Disclosure of notes and other explanatory information [Abstract]
Name of reporting entity or other means of identification	Woori Bank and subsidiaries
Name of parent entity	Woori Bank
Description of entity incorporation	established in 1899
Description of nature of entitys operations and principal activities	engaged in the commercial banking business under the Banking Act, trust business under the Financial Investment Services and Capital Market Act, and foreign currencies exchange business with approval from the Bank of Korea (“BOK”) and the Ministry of Finance and Economy (“MOFE”)
Change of holding company	Previously, Woori Finance Holdings Co., Ltd., the former holding company of Woori Financial Group, established on March 27, 2001 held a 100% ownership of the Bank. Effective November 1, 2014, Woori Finance Holdings Co., Ltd. completed its merger with and into Woori Bank, its wholly-owned subsidiary, as contemplated by the merger agreement dated July 28, 2014, by and between Woori Finance Holdings Co., Ltd. and Woori Bank. Accordingly, the shares of the Bank, 597 million shares, prior to the merger, were reduced to nil in accordance with capital reduction procedure, and then, in accordance with the merger ratio, the Bank newly issued 676 million shares.
Information of listing on stock market	On June 24, 2002, Woori Finance Holdings Co., Ltd. listed its common shares on the Korea Exchange through public offering. In addition, on September 29, 2003, the holding company registered with the Securities and Exchange Commission in the United States of America and, on the same day, listed its American Depositary Shares on the New York Stock Exchange. As Woori Finance Holdings Co., Ltd. was merged into the Bank, the Bank, which is the existing company, succeeded such rights and obligations as a listed company on the Korea Exchange and the New York Stock Exchange.
Issued capital	₩ 3,381,392	$ 3,167,818	₩ 3,381,392
Information of incorporated subsidiaries	the Bank incorporated Woori Card Co., Ltd., Woori Investment Bank Co., Ltd., Woori FIS Co., Ltd., Woori Private Equity Asset Management Co., Ltd., and Woori Finance Research Institute Co., Ltd. as its subsidiaries.
Address of registered office of entity	The head office of the Bank is located in 51 Sogong-ro, Jung Gu, Seoul, Korea.
Description of additional information of number of branches and offices	The Bank has 876 branches and offices in Korea, and 23 branches and offices overseas as of December 31, 2017.
Description of approval date of financial Statements	Mar. 02, 2018

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General_Consolidated subsidiaries (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Woori FIS Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori FIS Co., Ltd.		Woori FIS Co., Ltd.
Main business		System software development & maintenance		System software development & maintenance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 103,932		₩ 141,329
Liabilities		71,386		105,821
Operating revenue		252,460		244,783
Net income (loss) attributable to owners		1,940		1,048
Comprehensive income (loss) attributable to owners		₩ (2,963)		₩ 1,432
Woori Private Equity Asset Management Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Private Equity Asset Management Co., Ltd.		Woori Private Equity Asset Management Co., Ltd.
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 42,894		₩ 97,338
Liabilities		2,670		53,244
Operating revenue		7,257		2,154
Net income (loss) attributable to owners		(4,114)		312
Comprehensive income (loss) attributable to owners		₩ (4,074)		₩ 219
Woori Finance Research Institute Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Finance Research Institute Co., Ltd.		Woori Finance Research Institute Co., Ltd.
Main business		Other service business		Other service business
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 3,790		₩ 3,710
Liabilities		350		334
Operating revenue		4,733		4,445
Net income (loss) attributable to owners		83		108
Comprehensive income (loss) attributable to owners		₩ 64		₩ 100
Woori Card Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Card Co., Ltd.		Woori Card Co., Ltd.
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 8,605,993		₩ 7,606,108
Liabilities		6,973,705		6,180,893
Operating revenue		1,771,157		1,555,373
Net income (loss) attributable to owners		101,214		109,393
Comprehensive income (loss) attributable to owners		₩ 107,321		₩ 116,381
Woori Investment Bank Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Investment Bank Co., Ltd.		Woori Investment Bank Co., Ltd.
Main business		Other credit finance business		Other credit finance business
Percentage of ownership		59.80%	[1]	58.20%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity issued a rights offering that entitles its existing shareholders to buy additional shares directly from the entity in proportion to its existing holders. But, some shareholders opted not to buy the new share and Woori Bank was able to purchase more shares than they would be in accordance with their ownership percentage. This purchase resulted in the increase of its ownership percentage.		The entity issued a rights offering that entitles its existing shareholders to buy additional shares directly from the entity in proportion to its existing holders. But, some shareholders opted not to buy the new share and Woori Bank was able to purchase more shares than they would be in accordance with their ownership percentage. This purchase resulted in the increase of its ownership percentage.
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 1,880,157		₩ 1,576,627
Liabilities		1,588,610		1,404,566
Operating revenue		183,376		178,572
Net income (loss) attributable to owners		20,023		23,872
Comprehensive income (loss) attributable to owners		₩ 20,210		₩ 23,897
Woori Credit Information Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Credit Information Co., Ltd.		Woori Credit Information Co., Ltd.
Main business		Credit information		Credit information
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 33,298		₩ 31,292
Liabilities		6,175		4,416
Operating revenue		31,580		27,884
Net income (loss) attributable to owners		861		543
Comprehensive income (loss) attributable to owners		₩ 752		₩ 618
Woori America Bank
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori America Bank		Woori America Bank
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 1,954,301		₩ 2,186,049
Liabilities		1,679,248		1,973,263
Operating revenue		81,337		73,909
Net income (loss) attributable to owners		11,869		15,266
Comprehensive income (loss) attributable to owners		₩ (16,833)		₩ 20,899
Woori Global Markets Asia Limited
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Global Markets Asia Limited		Woori Global Markets Asia Limited
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 290,226		₩ 272,008
Liabilities		178,343		147,581
Operating revenue		11,345		7,255
Net income (loss) attributable to owners		1,922		1,863
Comprehensive income (loss) attributable to owners		₩ (12,544)		₩ 5,582
Woori Bank China Limited
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Bank (China) Limited		Woori Bank (China) Limited
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 4,960,637		₩ 4,984,017
Liabilities		4,458,683		4,466,812
Operating revenue		388,913		475,174
Net income (loss) attributable to owners		13,809		32,025
Comprehensive income (loss) attributable to owners		₩ (15,252)		₩ 11,505
AO Woori Bank
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		AO Woori Bank		AO Woori Bank
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 201,704		₩ 239,860
Liabilities		149,101		188,474
Operating revenue		15,656		16,221
Net income (loss) attributable to owners		4,748		5,650
Comprehensive income (loss) attributable to owners		₩ 1,217		₩ 15,553
PT Bank Woori Saudara Indonesia 1906 Tbk
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		PT Bank Woori Saudara Indonesia 1906 Tbk		PT Bank Woori Saudara Indonesia 1906 Tbk
Main business		Finance		Finance
Percentage of ownership		79.90%	[1]	74.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity issued a rights offering that entitles its existing shareholders to buy additional shares directly from the entity in proportion to its existing holders. But, some shareholders opted not to buy the new share and Woori Bank was able to purchase more shares than they would be in accordance with their ownership percentage. This purchase resulted in the increase of its ownership percentage.		The entity issued a rights offering that entitles its existing shareholders to buy additional shares directly from the entity in proportion to its existing holders. But, some shareholders opted not to buy the new share and Woori Bank was able to purchase more shares than they would be in accordance with their ownership percentage. This purchase resulted in the increase of its ownership percentage.
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 2,230,617		₩ 2,089,822
Liabilities		1,745,171		1,693,111
Operating revenue		192,485		179,014
Net income (loss) attributable to owners		38,488		24,573
Comprehensive income (loss) attributable to owners		₩ (18,689)		₩ 48,542
Banco Woori Bank do Brasil S.A
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Banco Woori Bank do Brasil S.A.		Woori Brazil Bank
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 213,889		₩ 241,229
Liabilities		181,544		206,043
Operating revenue		20,455		17,059
Net income (loss) attributable to owners		1,843		2,786
Comprehensive income (loss) attributable to owners		₩ (2,840)		₩ 9,600
Korea BTL Infrastructure Fund
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Korea BTL Infrastructure Fund		Korea BTL Infrastructure Fund
Main business		Finance		Finance
Percentage of ownership		99.90%		99.90%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 786,480		₩ 784,770
Liabilities		301		299
Operating revenue		30,240		33,476
Net income (loss) attributable to owners		26,390		29,617
Comprehensive income (loss) attributable to owners		₩ 26,390		₩ 29,617
Woori Fund Service Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Fund Service Co., Ltd		Woori Fund Service Co., Ltd
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 12,653		₩ 11,386
Liabilities		1,242		1,372
Operating revenue		9,021		7,787
Net income (loss) attributable to owners		1,398		1,011
Comprehensive income (loss) attributable to owners		₩ 1,398		₩ 1,011
Woori Finance Cambodia PLC
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Finance Cambodia PLC.		Woori Finance Cambodia
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 51,304		₩ 32,405
Liabilities		32,873		24,751
Operating revenue		5,895		4,545
Net income (loss) attributable to owners		983		1,250
Comprehensive income (loss) attributable to owners		₩ (473)		₩ 1,494
Woori Finance Myanmar Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Finance Myanma Co., Ltd		Woori Finance Myanmar
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 18,236		₩ 4,305
Liabilities		5,307		2,651
Operating revenue		2,506		380
Net income (loss) attributable to owners		791		(613)
Comprehensive income (loss) attributable to owners		₩ 15		₩ (569)
Wealth Development Bank
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Wealth Development Bank		Wealth Development Bank
Main business		Finance		Finance
Percentage of ownership		51.00%		51.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 191,049		₩ 209,779
Liabilities		156,808		174,446
Operating revenue		13,632		12,519
Net income (loss) attributable to owners		1,323		1,248
Comprehensive income (loss) attributable to owners		₩ (1,093)		₩ 1,876
Woori Bank Vietnam Limited
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Bank Vietnam Limited		Woori Bank Vietnam Limited
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets		₩ 775,758		₩ 159,223
Liabilities		632,160		278
Operating revenue		29,698
Net income (loss) attributable to owners		2,436		(346)
Comprehensive income (loss) attributable to owners		₩ (15,347)		₩ 3,545
Kumho Trust First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Kumho Trust First Co., Ltd.		Kumho Trust First Co., Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Asiana Saigon Inc
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Asiana Saigon Inc.		Asiana Saigon Inc.
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
AnDong Raja First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		An-Dong Raja First Co., Ltd.	[3]	An-Dong Raja First Co., Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership				0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		Due to liquidation during the year ended of December 31, 2017, the entity was excluded from the scope for consolidation.		Due to liquidation during the year ended of December 31, 2017, the entity was excluded from the scope for consolidation.
Consus Eighth Co LLC
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Consus Eighth Co., LLC		Consus Eighth Co., LLC
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
KAMCO Value Recreation First Securitization Specialty Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		KAMCO Value Recreation First Securitization Specialty Co., Ltd.		KAMCO Value Recreation First Securitization Specialty Co., Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership		15.00%	[2]	15.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Hermes STX Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Hermes STX Co., Ltd.		Hermes STX Co., Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
BWL First Co LLC
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		BWL First Co., LLC		BWL First Co., LLC
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Woori Poongsan Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori Poongsan Co., Ltd.	[3]	Woori Poongsan Co., Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership				0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		Due to liquidation during the year ended of December 31, 2017, the entity was excluded from the scope for consolidation.		Due to liquidation during the year ended of December 31, 2017, the entity was excluded from the scope for consolidation.
Deogi Dream Fourth Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Deogi Dream Fourth Co., Ltd.		Deogi Dream Fourth Co., Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Jeonju Iwon Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Jeonju Iwon Ltd.		Jeonju Iwon Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Wonju I one Inc
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Wonju I one Inc.		Wonju I one Inc.
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Heitz Third Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Heitz Third Co., Ltd.		Heitz Third Co., Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Woorihansoop First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woorihansoop 1st Co., Ltd.		Woorihansoop 1st Co., Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Electric Cable First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Electric Cable First Co., Ltd		Electric Cable First Co., Ltd
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Woori International First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori International First Co., Ltd.		Woori International First Co., Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Woori HJ First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Woori HJ First Co., Ltd.		Woori HJ First Co., Ltd.
Main business		Asset securitization		Asset securitization
Percentage of ownership		0.00%	[2]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Woori WEBST First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank
Subsidiaries		Woori WEBST 1st Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	0.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
HNLD First Inc
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank
Subsidiaries		HNLD 1st Inc.
Main business		Asset securitization
Percentage of ownership	[2]	0.00%
Explanation of newly added subsidiaries to consolidation		TThe entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Wibihansoop First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank
Subsidiaries		Wibihansoop 1st Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	0.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Uri QS First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank
Subsidiaries		Uri QS 1st Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	0.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Uri Display First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank
Subsidiaries		Uri Display 1st Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	0.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Tiger Eyes Second Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank
Subsidiaries		Tiger Eyes 2nd Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	0.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Woori Serveone First Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank
Subsidiaries		Woori Serveone 1st Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	0.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
HeungkukWoori Tech Company Private Placement Investment Trust No.1 and 5 beneficiary certificates
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank
Subsidiaries	[4]	HeungkukWoori Tech Company Private Placement Investment Trust No.1 and 5 beneficiary certificates
Main business		Securities investment and others
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of investment in securities and is in scope for consolidation, considering that the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Principle Guaranteed Trust
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Principle Guaranteed Trust		Principle Guaranteed Trust
Main business		Trust		Trust
Percentage of ownership		0.00%	[5]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a money trust under the Financial Investment Services and Capital Markets Act and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a money trust under the Financial Investment Services and Capital Markets Act and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Principle and Interest Guaranteed Trust
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank		Woori Bank
Subsidiaries		Principle and Interest Guaranteed Trust		Principle and Interest Guaranteed Trust
Main business		Trust		Trust
Percentage of ownership		0.00%	[5]	0.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a money trust under the Financial Investment Services and Capital Markets Act and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a money trust under the Financial Investment Services and Capital Markets Act and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Woori Private Equity Fund
Significant investments in subsidiaries [Abstract]
Investor		Woori Bank and Woori Private Equity Asset Management Co., Ltd	[6]	Woori Bank and Woori Private Equity Co., Ltd
Subsidiaries		Woori Private Equity Fund		Woori Private Equity Fund
Main business		Other financial business		Other financial business
Percentage of ownership				31.90%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		Due to liquidation of Woori Private Equity Asset Management Co., Ltd. during the year ended December 31, 2017 the entity was excluded from the scope for consolidation.		Due to liquidation of Woori Private Equity Asset Management Co., Ltd. during the year ended December 31, 2017 the entity was excluded from the scope for consolidation.
Woori EL Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Private Equity Fund	[6]	Woori Private Equity Fund
Subsidiaries		Woori EL Co Ltd		Woori EL Co Ltd
Main business		Other financial business		Other financial business
Percentage of ownership				100.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		Due to liquidation of Woori Private Equity Asset Management Co., Ltd. during the year ended December 31, 2017 the entity was excluded from the scope for consolidation.		Due to liquidation of Woori Private Equity Asset Management Co., Ltd. during the year ended December 31, 2017 the entity was excluded from the scope for consolidation.
Dongwoo First Securitization Specialty Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Investment Bank		Woori Investment Bank
Subsidiaries		Dongwoo First Securitization Specialty Co Ltd		Dongwoo First Securitization Specialty Co Ltd
Main business		Asset securitization		Asset securitization
Percentage of ownership		5.00%	[2]	5.00%
Description of nature of relationship with subsidiary where parent has directly or indirectly less than half of voting power		The entity is a money trust under the Financial Investment Services and Capital Markets Act and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.		The entity is a money trust under the Financial Investment Services and Capital Markets Act and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Seari First Securitization Specialty Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Investment Bank
Subsidiaries		Seari First Securitization Specialty Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	5.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Namjong First Securitization Specialty Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Investment Bank
Subsidiaries		Namjong 1st Securitization Specialty Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	5.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Bukgeum First Securitization Specialty Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Investment Bank
Subsidiaries		Bukgeum First Securitization Specialty Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	5.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
TUTU FinanceWCI Myanmar Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Card Co., Ltd.		Woori Card Co., Ltd.
Subsidiaries		TUTU FinanceWCI Myanmar Co Ltd		TUTU FinanceWCI Myanmar Co Ltd
Main business		Finance		Finance
Percentage of ownership		100.00%		100.00%
Woori Card one of 2017-1 Securitization Specialty Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Card Co., Ltd.
Subsidiaries		Woori Card one of 2017-1 Securitization Specialty Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	5.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Woori Card one of 2017-2 Securitization Specialty Co Ltd
Significant investments in subsidiaries [Abstract]
Investor		Woori Card Co., Ltd.
Subsidiaries		Woori Card one of 2017-2 Securitization Specialty Co., Ltd.
Main business		Asset securitization
Percentage of ownership	[2]	5.00%
Explanation of newly added subsidiaries to consolidation		The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.
Money trust under the FISCM Act
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets	[7]	₩ 1,560,672		₩ 1,525,145
Liabilities	[7]	1,530,760		1,495,815
Operating revenue	[7]	44,344		55,540
Net income (loss) attributable to owners	[7]	582		697
Comprehensive income (loss) attributable to owners	[7]	582		697
Structured entity for the securitization of financial assets
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets	[8]	867,583		487,431
Liabilities	[8]	1,275,719		895,824
Operating revenue	[8]	22,730		29,480
Net income (loss) attributable to owners	[8]	1,179		6,912
Comprehensive income (loss) attributable to owners	[8]	(2,800)		7,138
Structured entity for the investments in securities
Disclosure of condensed financial information of significant investments in subsidiaries [Abstract]
Assets	[9]	34,939		4,397,163
Liabilities	[9]	76		1,898,977
Operating revenue	[9]	377		137,896
Net income (loss) attributable to owners	[9]	(475)		56,605
Comprehensive income (loss) attributable to owners	[9]	₩ (38,592)		₩ 61,535

[1] The entity issued a rights offering that entitles its existing shareholders to buy additional shares directly from the entity in proportion to its existing holders. But, some shareholders opted not to buy the new share and Woori Bank was able to purchase more shares than they would be in accordance with their ownership percentage. This purchase resulted in the increase of its ownership percentage.

[2] The entity is a structured entity for the purpose of asset securitization and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

[3] Due to liquidation during the year ended of December 31, 2017, the entity was excluded from the scope for consolidation.

[4] The entity is a structured entity for the purpose of investment in securities and is in scope for consolidation, considering that the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

[5] The entity is a money trust under the Financial Investment Services and Capital Markets Act and is in scope for consolidation. Although the Group is not a majority shareholder, the Group 1) has the power over the investee, 2) is exposed, or has rights, to variable returns from its involvement with the investee, and 3) has the ability to use its power to affect its returns.

[6] Due to liquidation of Woori Private Equity Asset Management Co., Ltd. during the year ended December 31, 2017 the entity was excluded from the scope for consolidation.

[7] The Group provides with financial guarantee of principal and interest or principal only to some of its trust products. Due to the financial guarantees, the Group may be obliged to supplement when the principal and interest or principal of the trust product sold is short of the guaranteed amount depending on the result of investment performance of the trust product.

[8] The structured entity is established for the purpose of securitization of project financing loans, corporate bonds, and other financial assets. The Group is involved with the structured entity through providing with credit facility over asset-backed commercial papers issued by the entity, originating loans directly to the structured entity, or purchasing 100% of the subordinated debts issued by the structured entity.

[9] The structured entity is established for the purpose of investments in securities. The Group acquires beneficiary certificates through its contribution of fund to the structured entity, and it is exposed to the risk that it may not be able to recover its fund depending on the result of investment performance of asset managers of the structured entity

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General_Unconsolidated companies with more than 50 Percent ownership interests (Details)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Golden Bridge NHN Online Private Equity Investment
Disclosure of information about unconsolidated subsidiaries [Line Items]
Name of subsidiary	[1]	Golden Bridge NHN Online Private Equity Investment	Golden Bridge NHN Online Private Equity Investment
Location		Korea	Korea
Main business		Securities Investment	Securities Investment
Percentage of ownership		60.00%	60.00%
Description of reason why entity with more than half of voting power directly or indirectly owned which is not subsidiary due to absence of control		The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.	The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.
Mirae Asset Maps Clean Water Private Equity Investment Trust Seventh
Disclosure of information about unconsolidated subsidiaries [Line Items]
Name of subsidiary	[1]	Mirae Asset Maps Clean Water Private Equity Investment Trust 7th	Mirae Asset Maps Clean Water Private Equity Investment Trust 7th
Location		Korea	Korea
Main business		Securities Investment	Securities Investment
Percentage of ownership		59.70%	59.70%
Description of reason why entity with more than half of voting power directly or indirectly owned which is not subsidiary due to absence of control		The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.	The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.
Hana Walmart Real Estate Investment Trust 41-1
Disclosure of information about unconsolidated subsidiaries [Line Items]
Name of subsidiary	[1]	Hana Walmart Real Estate Investment Trust 41-1
Location		Korea
Main business		Securities Investment
Percentage of ownership		90.10%
Description of reason why entity with more than half of voting power directly or indirectly owned which is not subsidiary due to absence of control		The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.
IGIS Global Private Placement Real Estate Fund No. 148-1
Disclosure of information about unconsolidated subsidiaries [Line Items]
Name of subsidiary	[1]	IGIS Global Private Placement Real Estate Fund No. 148-1
Location		Korea
Main business		Securities Investment
Percentage of ownership		75.00%
Description of reason why entity with more than half of voting power directly or indirectly owned which is not subsidiary due to absence of control		The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.
IGIS Global Private Placement Real Estate Fund No. 148-2
Disclosure of information about unconsolidated subsidiaries [Line Items]
Name of subsidiary	[1]	IGIS Global Private Placement Real Estate Fund No. 148-2
Location		Korea
Main business		Securities Investment
Percentage of ownership		75.00%
Description of reason why entity with more than half of voting power directly or indirectly owned which is not subsidiary due to absence of control		The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.
Kiwoom Yonsei Private Equity Investment Trust
Disclosure of information about unconsolidated subsidiaries [Line Items]
Name of subsidiary	[1]	Kiwoom Yonsei Private Equity Investment Trust	Kiwoom Yonsei Private Equity Investment Trust
Location		Korea	Korea
Main business		Securities Investment	Securities Investment
Percentage of ownership		88.90%	88.90%
Description of reason why entity with more than half of voting power directly or indirectly owned which is not subsidiary due to absence of control		The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.	The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.
Kiwoom Frontier Professional Investment Private Fund 6 (Bond)
Disclosure of information about unconsolidated subsidiaries [Line Items]
Name of subsidiary	[2]		Kiwoom Frontier Professional Investment Private Fund 6 (Bond)
Location			Korea
Main business			Securities Investment
Percentage of ownership			50.00%
Description of reason why entity with more than half of voting power directly or indirectly owned which is not subsidiary due to absence of control			The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.

[1] The Group owns the majority ownership interest in these structured entities, but has no power on the investees’ relevant activities. As results, it is deemed that the Group has no power or control on the structured entities.

[2] Due to redemption of the fund during 2017, the fund was excluded from the list as of December 31, 2017 above.

XML

General_Financial informations Maximum exposure and Loss recognised of unconsolidated structured entities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Asset securitization vehicle
Disclosure of unconsolidated structured entities [Line Items]
The maximum exposure to risks	₩ 4,032,531	₩ 4,263,993
Investments	3,215,159	3,361,910
Purchase agreements		28,000
Credit facilities	817,372	834,083
Other commitments		40,000
Loss recognized on unconsolidated structured entities	₩ 837	₩ 6,353
Disclosure of information about interests in structured entity	Asset securitization vehicle issues asset-backed securities and redeems the principal and interest or distributes dividends on asset-backed securities with profits from collecting cash flows or sale of securitized assets. The Group, as a secondary guarantor, provides purchase commitments for its asset-backed securities or guarantees to such asset securitization vehicle and recognizes commission income or interest income related to the commitment or guarantees. Therefore, the Group would be exposed to risks to purchases or pays back asset-backed securities issued by the vehicles when a primary guarantor fails to provide the financing asset securitization vehicles.	Asset securitization vehicle issues asset-backed securities and redeems the principal and interest or distributes dividends on asset-backed securities with profits from collecting cash flows or sale of securitized assets. The Group, as a secondary guarantor, provides purchase commitments for its asset-backed securities or guarantees to such asset securitization vehicle and recognizes commission income or interest income related to the commitment or guarantees. Therefore, the Group would be exposed to risks to purchases or pays back asset-backed securities issued by the vehicles when a primary guarantor fails to provide the financing asset securitization vehicles.
Asset securitization vehicle | Classes of assets [Domain]
Disclosure of unconsolidated structured entities [Line Items]
Total asset of the unconsolidated structured entities	₩ 7,295,601	₩ 8,426,713
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	3,215,159	3,361,910
Asset securitization vehicle | Loans and receivables
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	43,180	65,470
Asset securitization vehicle | Available-for-sale financial assets
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	902,390	1,216,446
Asset securitization vehicle | Held-to-maturity financial assets
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	2,269,451	2,079,648
Asset securitization vehicle | Derivative assets
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	138	346
Asset securitization vehicle | Liabilities [Domain]
Disclosure of unconsolidated structured entities [Line Items]
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities	1,433	1,363
Asset securitization vehicle | Derivative liabilities
Disclosure of unconsolidated structured entities [Line Items]
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities	575	201
Asset securitization vehicle | Other liabilities (including provisions)
Disclosure of unconsolidated structured entities [Line Items]
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities	858	1,162
Structured finance
Disclosure of unconsolidated structured entities [Line Items]
The maximum exposure to risks	2,918,448	3,802,210
Investments	2,314,043	2,790,215
Credit facilities	604,405	970,195
Other commitments		41,800
Loss recognized on unconsolidated structured entities	₩ 3,939	₩ 71,185
Disclosure of information about interests in structured entity	Structured finance includes investments in project financing on real estates, social overhead capital (“SOC”), infrastructure and shipping finance. They are formed as special purpose entity by funding through equity investments and loans from various investors. Investment decisions are made by the Group based on business outlook of such projects. In relation to such investments, the Group recognizes interest income on loans, gains or losses on valuation of equity investments or dividend income. The structured finance is secured by additional funding agreement, guarantee or credit facilities. However, the structured financing project would fail to return the capital of equity investments or principal of loans to the Group if it is discontinued or did not achieve business outcome.	Structured finance includes investments in project financing on real estates, social overhead capital (“SOC”), infrastructure and shipping finance. They are formed as special purpose entity by funding through equity investments and loans from various investors. Investment decisions are made by the Group based on business outlook of such projects. In relation to such investments, the Group recognizes interest income on loans, gains or losses on valuation of equity investments or dividend income. The structured finance is secured by additional funding agreement, guarantee or credit facilities. However, the structured financing project would fail to return the capital of equity investments or principal of loans to the Group if it is discontinued or did not achieve business outcome.
Structured finance | Classes of assets [Domain]
Disclosure of unconsolidated structured entities [Line Items]
Total asset of the unconsolidated structured entities	₩ 40,172,830	₩ 61,324,862
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	2,314,043	2,790,215
Structured finance | Loans and receivables
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	1,969,760	2,414,044
Structured finance | Financial assets held for trading
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	233,428	254,150
Structured finance | Available-for-sale financial assets
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	106,819	115,843
Structured finance | Derivative assets
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	4,036	6,178
Structured finance | Liabilities [Domain]
Disclosure of unconsolidated structured entities [Line Items]
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities	1,506	1,224
Structured finance | Derivative liabilities
Disclosure of unconsolidated structured entities [Line Items]
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities	968	362
Structured finance | Other liabilities (including provisions)
Disclosure of unconsolidated structured entities [Line Items]
Liabilities recognized in the consolidated financial statements related to the unconsolidated structured entities	538	862
Investment Funds
Disclosure of unconsolidated structured entities [Line Items]
The maximum exposure to risks	1,138,523	1,749,494
Investments	1,138,523	1,749,494
Loss recognized on unconsolidated structured entities	₩ 5,993	₩ 683
Disclosure of information about interests in structured entity	Investment funds include trusts and private equity funds. A trust is formed by contributions from various investors, operated by a manager engaged to the trust and distributed proceeds from sales of investments to the investors. A private equity fund is established in order to acquire ownership interests in a portfolio company with exit strategy after implementing financial and operational restructuring of the company. The Group recognizes unrealized gains or losses on change in value of investments in proposition of ownership interests in investments. The Group would be exposed to risks of loss when the value of portfolio investment is decreased.	Investment funds include trusts and private equity funds. A trust is formed by contributions from various investors, operated by a manager engaged to the trust and distributed proceeds from sales of investments to the investors. A private equity fund is established in order to acquire ownership interests in a portfolio company with exit strategy after implementing financial and operational restructuring of the company. The Group recognizes unrealized gains or losses on change in value of investments in proposition of ownership interests in investments. The Group would be exposed to risks of loss when the value of portfolio investment is decreased.
Investment Funds | Classes of assets [Domain]
Disclosure of unconsolidated structured entities [Line Items]
Total asset of the unconsolidated structured entities	₩ 13,641,135	₩ 9,131,362
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	1,138,523	1,749,494
Investment Funds | Financial assets held for trading
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	10,160
Investment Funds | Available-for-sale financial assets
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	904,774	1,664,865
Investment Funds | Investments in joint ventures and associates
Disclosure of unconsolidated structured entities [Line Items]
Assets recognized in the consolidated financial statements related to the unconsolidated structured entities	₩ 223,589	₩ 84,629

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General_Limitations on transfer of assets or the redemption of liabilities within the Group (Details)	12 Months Ended
	Dec. 31, 2017
Disclosure of nature and extent of significant restrictions on transfer of assets or redemption of liabilities [Abstract]
Description of nature and extent of significant restrictions on transfer of assets or redemption of liabilities	Some subsidiaries are regulated by the rules of the jurisdictions, in which they were incorporated, with regard to funding or management of deposits. Also, there is the limitation that they must have pre-approval from their regulators in case of remittance of earnings to the Group.

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General_Noncontrolling interests (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Woori Investment Bank
Disclosure of significant investments in subsidiaries [Line Items]
Accumulated non-controlling interests	₩ 119,111	₩ 73,986
Net income attributable to non-controlling interests	8,370	9,990	₩ 4,353
PT Bank Woori Saudara Indonesia 1906 Tbk
Disclosure of significant investments in subsidiaries [Line Items]
Accumulated non-controlling interests	64,877	70,249
Net income attributable to non-controlling interests	8,882	6,383	6,241
Dividends to non-controlling interests	1,513	1,242	₩ 778
Wealth Development Bank
Disclosure of significant investments in subsidiaries [Line Items]
Accumulated non-controlling interests	16,778	16,983
Net income attributable to non-controlling interests	₩ 648	₩ 611

XML

Significant Basis Of Preparation And Accounting Policies_Basis of presentation (Details)

12 Months Ended

Dec. 31, 2017

Accounting policies [Abstract]

Disclosure of basis of preparation of financial statements

(1) Basis of presentation

The Group’s consolidated financial statements are prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).

The Group operates primarily in Korea and its official accounting records are maintained in Korean Won. The United States dollar (“U.S. dollar” or “US$” or “USD”) amounts are provided herein as supplementary information solely for the convenience of readers outside Korea. Korean Won amounts are expressed in U.S. Dollars at the rate of 1,067.42 Korean Won to US$1.00, the noon buying exchange rate in effect on December 31, 2017, as quoted by the Federal Reserve Bank of New York in the United States. Such convenience translation into U.S. Dollars should not be construed as representations that Korean Won amounts have been, could have been, or could in the future be, converted at this or any other rate of exchange.

The significant accounting policies that have been applied for the preparation of the consolidated financial statements for the year ended December 31, 2017 are described below. There have not been changes to the significant accounting policies except for the impacts from the adoptions of accounting standards or interpretations which are explained below.

The Group’s consolidated financial statements have been prepared based on the historical cost method except for specific non-current assets and certain financial assets or liabilities reported at fair value. Historical cost is generally based on the fair value of the consideration given in exchange for goods and services.

The consolidated financial statements of the Group were approved by the board of directors on March 2, 2018.

1) The Group has newly adopted the following new standards and interpretations that affected the Group’s accounting policies.

Amendments to IAS 7—Statement of Cash Flows

The amendments require an entity to provide disclosures that enable users of financial statements to evaluate changes in liabilities arising from financing activities, including both cash and non-cash changes. Additional disclosure required related to the first time application of these amendments in the current year are in note 6. Consistent with the transition provisions of the amendments, the Group has not disclosed comparative information for the prior period. Apart from the additional disclosure in note 6, the application of these amendments has no material impact on the disclosures or the amounts recognized in the Group’s consolidated financial statements.

Amendments to IAS 12—Income Taxes

The amendments clarify that in evaluating the deferred tax assets arising from deductible temporary difference of debt instruments measured at fair value, the carrying amount of an asset does not limit the estimation of probable future taxable profits. The application of these amendments has no material impact on the disclosures or the amounts recognized in the Group’s consolidated financial statements.

Other than the amendment stated above, there are several annual improvements in the current period, but the application of the amendments has had no material effect on the Group’s consolidated financial statements.

2) The Group has not applied the following IFRSs that have been issued but are not yet effective:

Enactments to IFRS 9—Financial Instruments

IFRS 9 issued in November 2009 introduced new requirements for the classification and measurement of financial assets. IFRS 9 was subsequently amended in October 2010 to include requirements for the classification and measurement of financial liabilities and for derecognition, and in November 2013 to include the new requirements for general hedge accounting. Another revised version of IFRS 9 was issued in July 2014 mainly to include a) impairment requirements for financial assets and b) limited amendments to the classification and measurement requirements by introducing a ‘fair value through other comprehensive income’(FVTOCI) measurement category for certain simple debt instruments. This standards supersedes IAS 39—Financial Instruments: Recognition and Measurement, and will be applied for annual periods beginning on or after January 1, 2018.

In principle, IFRS 9 must be applied retrospectively. However, there are certain exemptions to the application of retroactive approach such as presenting comparative information on classification, measurement and impairment of financial instruments. In addition, IFRS 9 is applied prospectively for hedge accounting with exceptions such as accounting for the time value of options. The Group will apply the standard retrospectively, in accordance with IAS 8 “Accounting Policies, Changes in Accounting Estimates and Errors”, but will not restate previous periods provided that it is not possible to do so without the use of hindsight. Because of this, the Group will recognise any difference between the previous carrying amount and the carrying amount at the beginning of the annual reporting period that includes the date of initial application of IFRS 9 (January 1, 2018) in the opening retained earnings as of January 1, 2018.

The Group has completed the design and implementation of the internal controls and/or financial reporting processes related to the presentation of financial instruments in order to adopt IFRS 9. The Group has completed a financial impact analysis on the 2017 financial statements based on available information as of year-end in order to determine the impact of adopting IFRS 9 for the first time. The expected financial impact of each key issue on the financial statement, is as follows.

a) Classification and Measurement of Financial Instruments

When IFRS 9 is adopted, all recognized financial assets that in scope are subsequently measured at either amortized cost, fair value through other comprehensive income (FVTOCI), or fair value through profit or loss (FVTPL) as shown below, based on the business model for managing financial assets and based on the nature of contractual cash flows arising from the financial assets. Also, when hybrid contracts contain financial asset as its host contract, the embedded derivative will not be bifurcated as the whole hybrid contract would be classified as a financial asset.

	Business Model
Nature of the contractual cash flow	Collection of the contractual cashflow	Collection of the contractual cashflow and sale of asset	Sale of asset, others
Principal and Interest only	Amortized Cost(*1)	FVTOCI(*1)	FVTPL
Other than the above		FVTPL(*2)

(*1) An irrevocable election is available to designate a financial asset to be classified as FVTPL, for the purpose of eliminating or reducing accounting discrepancies.

(*2) For equity securities held for purposes other than short-term trading, an irrevocable election is available to designate them as FVTOCI financial assets.

As the requirements to classify a financial asset as either amortized cost or FVTOCI are more stringent in IFRS 9 than in IAS 39, the variability of net income may increase as the amount of FVTPL financial assets is increased due to the adoption of IFRS 9.

As of year-end the Group currently holds loans and receivables amounting to 267,106,204 million Won, held-to-maturity financial assets amounting to 16,749,296 million Won. This amount includes 51,653 million Won of hybrid contracts in which the host contract, after separating the embedded derivatives, is a debt security. In addition, The group also holds available-for-sale financial assets amounting to 15,352,950 million Won, and FVTPL financial assets (except derivatives) amounting to 2,727,302 million Won as of year end in accordance with IAS 39.

According to IFRS 9, a financial asset may be measured at amortized cost only when its cashflows are solely principal and interest on specified dates on the contract and when the purpose of holding such asset is only to receive the contractual cashflows.

The estimated impact on the classification and measurement of Group’s financial assets (except derivatives) as of year-end is presented as follows. The following information is constructed from the accounting system for financial instruments built for the purpose of adopting IFRS 9.

(Unit : Korean Won in millions)

Classification per IAS 39	Classification per IFRS 9	Carrying Amount per IAS 39		Carrying Amount per IFRS 9
Loans and receivables (Deposits)	Amortized cost		8,870,835		8,870,835
Financial assets at FVTPL (Deposits)	FVTPL		25,972		25,972
Financial assets at FVTPL (Debt securities)	FVTPL		2,654,027		2,654,027
AFS financial assets (Debt securities)	FVTPL		46,855		46,855
AFS financial assets (Debt securities)	FVTOCI		12,874,209		12,874,209
AFS financial assets (Debt securities)	Amortized cost		308,181		322,300
Held-to-maturity financial assets (Debt securities)	Amortized cost		16,749,296		16,749,296
Financial assets at FVTPL (Equity securities)	FVTPL		47,304		47,304
AFS financial assets (Equity securities)	FVTPL		1,273,498		1,274,716
AFS financial assets (Equity securities)	FVTOCI		850,207		850,207
Loans and receivables (Loans)	FVTPL		279,032		280,001
Loans and receivables (Loans)	Amortized cost		253,014,491		253,014,491
Loans and receivables (Other financial assets)	Amortized cost		6,772,088		6,772,088
Total financial assets except derivatives			303,765,995		303,782,301

Among the financial assets measured at amortized cost, loans and receivables and held-to-maturity financial assets amounting to 279,032 million Won and AFS financial assets amounting to 1,320,353 million Won would be reclassified to FVTPL financial assets as a result of adopting IFRS 9.

b) Classification and Measurement of Financial Liabilities

According to the IFRS 9, the amount of changes in the fair value of financial liabilities measured at FVTPL due to changes in credit risk is presented as part of other comprehensive income, and such amount is not recycled subsequently in profit or loss. However, when recognizing the fair value changes in other comprehensive income causes or magnifies accounting discrepancies, the amount is recognized in profit or loss instead.

As of year-end the Group holds financial liabilities amounting to 294,809,262 million Won, and out of this amount 251,796 million Won has been designated as FVTPL financial liabilities. In relation to these financial liabilities, the increase in fair value amounting to 31,275 million Won has been recognized as losses for the year ended 2017 in accordance with IAS 39.

The results of the analysis conducted to determine the financial impact of applying IFRS 9 on FVTPL financial liabilities as of year-end show that the cumulative changes in fair value of FVTPL financial liabilities as a result of changes in credit risk amounted to 133 million Won.

c) Impairment: Financial assets and Contract assets

IFRS 9 requires the recognition of allowance for expected credit losses for debt instruments, lease receivables, contract assets, loan commitments and financial guarantee contracts measured at either amortized cost or FVTOCI.

The allowance to be recognized under IFRS 9 is the amount of expected 12-month credit loss or the expected lifetime credit loss, according to the 3 stages of credit risk deterioration since initial recognition as shown below.

	Stage 1	Stage 2	Stage 3
	Credit risk has not significantly increased since initial recognition(*)	Credit risk has significantly increased since initial recognition	Credit has been impaired
Allowance for expected credit losses	Expected 12-month credit losses: Expected credit losses due to possible defaults on financial instruments within 12-month period from the year-end.	Expected lifetime credit losses: Expected credit losses from all possible defaults during the expected lifetime of the financial instruments.

(*) Credit risk may be considered to not have been significantly increased when credit risk is low at the reporting date. The Group considers that a financial asset’s credit risk is low when its credit risk rating is equivalent to the generally understood definition of “investment grade”.

Meanwhile, for purchased or originated credit impaired assets, the allowance for expected credit losses per IFRS 9 is the amount of cumulative changes in the expected lifetime credit losses after its initial recognition.

Determining a significant increase in credit risk since initial recognition

The Group assess when a significant increase in credit risk has occurred based on quantitative and qualitative assessments. For the financial assets subject to the impairment provision of IFRS 9, it is considered to have a significant increase in credit risk and are moved to stage 2 when the following indicator exists:

• Credit rating decrease by more than the agreed threshold relative to the credit rating at initial recognition

• Accounts that is classified as precautious level defined by Financial Supervisory Service

• Borrower has financial difficulties or has early warning signal as defined by the Group

• Backstop criteria—accounts that are 30 calendar days or more past due.

Forward-looking information

Credit losses are the expected cash shortfalls from what is contractually due over the expected life of the financial instrument, discounted at the original effective interest rate. Expected credit losses (ECL) are the unbiased probability-weighted credit losses determined by evaluating a range of possible outcomes and considering future economic conditions. The Group incorporated forward-looking information by using statistical analysis on various macroeconomic variables. The Group has integrated such results in modelling probability of default (PD)

Modeling techniques

ECL are calculated by multiplying three main components, being the PD, loss given default and the exposure at default, discounted at the original effective interest rate. ECL is measured at the individual financial instrument level, however a collective approach where financial instruments with similar risk characteristics are grouped together, with apportionment to individual financial instruments, is used where effects can only be seen at collective level.

For the IFRS 9 impairment assessment, the Group developed models are used to determine the probability of default, loss given default and exposure at default. For stage 2 and 3, the Group applies lifetime PDs but uses 12 month PDs for stage 1. The ECL drivers of PD, exposure at default and loss given default are modelled at an account level which considers historical data available by the Group.

As of year-end the Group holds loans and receivables amounting to 267,106,204 million Won in accordance with IAS 39. In relation to this amount, the Group has recognized allowance for credit losses amounting to 1,830,242 million Won.

The expected impact on the allowance for credit losses as of year-end using the Group’s system for allowances is as follows.

(Unit : Korean Won in millions)

	Allowance for credit losses per IAS 39 (A)		Allowance for credit losses per IFRS 9 (B)		Increases(B-A)
Deposits		2,458		3,092		634
Debt securities		—		9,331		9,331
AFS debt securities		—		4,253		4,253
Held-to-maturity debt securities		—		5,078		5,078
Loan receivables and other financial assets		1,827,785		2,075,752		247,967
Guarantees		183,247		192,376		9,129
Loan commitments		66,115		104,887		38,772
Total		2,079,605		2,385,438		305,833

d) Hedge accounting

The requirements for hedge accounting in IFRS 9 has become more lenient as compared to IAS 39. That is, more financial instruments may now be considered to be a hedged item and/or a hedging instrument, the quantitative basis for evaluating high hedge effectiveness (80~125%) has been abolished, and the retroactive assessment requirement has also been abolished. These allow the firms to concentrate on hedging activities.

There are no significant impacts to the Group’s financial statements related to hedge accounting as a result of adopting IFRS 9.

e) Effect on regulatory capital ratios

Based on the analysis on IFRS 9, there are no significant impacts to the regulatory capital ratios.

Enactments to IFRS 15—Revenue from Contracts with Customers

The core principle under IFRS 15 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendments introduces a 5-step approach to revenue recognition and measurement: 1) Identify the contract with a customer, 2) Identify the performance obligations in the contract, 3) Determine the transaction price, 4) Allocate the transaction price to the performance obligations in the contract, 5) Recognize revenue when (or as) the entity satisfies a performance obligation. This standard will supersede IAS 11—Construction Contracts, IAS 18- Revenue, IFRIC 13—Customer Loyalty Programmes, IFRIC 15—Agreements for the Construction of Real Estate, IFRIC 18—Transfers of Assets from Customers, and SIC 31—Revenue-Barter Transactions Involving Advertising Services. The enactment is effective for annual periods beginning on or after 1 January 2018. The Group does not expect the enactments to have a significant impact on the consolidated financial statements.

Enactments to IFRS 16—Leases

IFRS 16 introduces a comprehensive model for the identification of lease arrangements and accountings treatments for both lessors and lessees. IFRS 16 will supersede the current lease guidance including IAS 17 Leases and the related interpretations. The enactments are effective for annual periods beginning on or after 1 January 2019.

IFRS 16 distinguishes leases and service contracts on the basis of whether an identified asset is controlled by a customer. Distinctions of operating leases and finance leases are removed for lessee accounting and is replaced by model where a right-of-use asset and corresponding liability have to be recognized for all leases by lessees except for short-term leases and leases of low value assets.

The right-of-use asset is initially measured at cost and subsequently measured at cost (subject to certain exceptions) less accumulated depreciation and impairment losses, adjusted for any remeasurement of the lease liability. The lease liability is initially measured at the present value of the lease payments that are not paid at that date. Subsequently, the lease liability is adjusted for interest and lease payments, as well as the impact of lease modifications, amongst others. Furthermore, the classification of cash flows will also be affected as operating lease payments under IAS 17 are presented as operating cash flows; whereas under the IFRS 16 model, the lease payments will be split into a principal and an interest portion which will be presented as financing and operating cash flows respectively.

In contrast to lessee accounting, IFRS 16 substantially carries forward the lessor accounting requirements in IAS 17, and continues to require a lessor to classify a lease either as an operating lease or a finance lease. Furthermore, extensive disclosures are required by IFRS 16.

In contrast, 1) for finance leases where the Group is a lessee and 2) in cases where the Group is a lessor, the Group do not anticipate that the application of IFRS 16 will have a significant impact on the amounts recognized in the Group’s consolidated financial statements.

Amendments to IFRS 2—Share-based Payment

The amendments include: 1) when measuring the fair value of share-based payment, the effects of vesting and non-vesting conditions on the measurement of cash-settled share-based payment should be consistent with the measurement of equity-settled share-based payment, 2) Share-based payment transaction in which the Group settles the share-based payment arrangement net by withholding a specified portion of the equity instruments per statutory tax withholding requirements would be classified as equity-settled in its entirety, if otherwise would be classified as equity-settled without the net settlement feature, and 3) when a cash-settled share-based payment changes to an equity-settled share-based payment because of modifications of the terms and conditions, the original liability recognized is derecognized and the equity-settled share-based payment is recognized at the modification date fair value. Any difference between the carrying amount of the liability at the modification date and the amount recognized in equity at the same date would be recognized in profit and loss immediately. The amendments are effective for annual periods beginning on or after January 1, 2018. The Group does not expect the amendments to have a significant impact on the consolidated financial statements.

Amendments to IAS 40—Transfers of Investment Property

The amendments clarify that a transfer to, or from, investment property necessitates an assessment of whether a property meets, or has ceased to meet, the definition of investment property, supported by observable evidence that a change in use has occurred. The amendments further clarify that situations other than the ones listed in IAS 40 may evidence a change in use, and that a change in use is possible for properties under construction (i.e. a change in use is not limited to completed properties).

The amendments are effective for annual periods beginning on or after January 1, 2018 with earlier application permitted. Entities can apply the amendments either retrospectively (if this is possible without the use of hindsight) or prospectively. The Group does not expect the amendments to have a significant impact on the consolidated financial statements.

Enactments to IFRIC 22—Foreign Currency Transactions and Advance Consideration

The interpretation addresses how to determine the ‘date of transaction’ for the purpose of determining the exchange rate to use on initial recognition of an asset, expense or income, when consideration for that item has been paid or received in advance in a foreign currency which resulted in the recognition of a non-monetary asset or non-monetary liability (e.g. a non-refundable deposit or deferred revenue).

The interpretation specifies that the date of transaction is the date on which the entity initially recognizes the non-monetary asset on non-monetary liability arising from the payment or receipt of advance consideration. If there are multiple payments or receipts in advance, the interpretation requires an entity to determine the date of transaction for each payment or receipt of advance consideration. The Group does not expect the enactments to have a significant impact on the consolidated financial statements.

The interpretation is effective for annual periods beginning on or after January 1, 2018 with earlier application permitted. Entities can apply the interpretation either retrospectively or prospectively. Specific transition provisions apply to prospective application.

Description of nature of financial statements

Consolidated Financial Statements

Description of approval date of financial statements

Mar. 02, 2018

Explanation of body of authorisation

the Board of Directors

Date of end of reporting period

Dec. 31, 2017

Period covered by financial statements

For the years ended December 31 2017

Description of presentation currency

Korean Won

Description of functional currency

Korean Won

Level of rounding used in financial statements

in millions of Won

Description of accounting policy for functional currency

The Group operates primarily in Korea and its official accounting records are maintained in Korean Won

Methods of translation used to determine supplementary information

The United States dollar (“U.S. dollar” or “US$” or “USD”) amounts are provided herein as supplementary information solely for the convenience of readers outside Korea. Korean Won amounts are expressed in U.S. Dollars at the rate of 1,067.42 Korean Won to US$1.00, the noon buying exchange rate in effect on December 31, 2017, as quoted by the Federal Reserve Bank of New York in the United States. Such convenience translation into U.S. Dollars should not be construed as representations that Korean Won amounts have been, could have been, or could in the future be, converted at this or any other rate of exchange.

Explanation of measurement bases used in preparing financial statements

The Group’s consolidated financial statements have been prepared based on the historical cost method except for specific non-current assets and certain financial assets or liabilities reported at fair value. Historical cost is generally based on the fair value of the consideration given in exchange for goods and services.

XML

Significant Basis Of Preparation And Accounting Policies_Newly adopted standards and interpretations that affected the Groups accounting policies (Details)	12 Months Ended
	Dec. 31, 2017
Amendments to IAS 7 Statement of Cash Flows
Disclosure of voluntary change in accounting policy [Line Items]
Description of nature of voluntary change in accounting policy	The amendments require an entity to provide disclosures that enable users of financial statements to evaluate changes in liabilities arising from financing activities, including both cash and non-cash changes. Additional disclosure required related to the first time application of these amendments in the current year are in note 6. Consistent with the transition provisions of the amendments, the Group has not disclosed comparative information for the prior period.
Description of reasons why applying new accounting policy provides reliable and more relevant information	Apart from the additional disclosure in note 6, the application of these amendments has no material impact on the disclosures or the amounts recognized in the Group’s consolidated financial statements.
Amendments to IAS 12 Income Taxes
Disclosure of voluntary change in accounting policy [Line Items]
Description of nature of voluntary change in accounting policy	The amendments clarify that in evaluating the deferred tax assets arising from deductible temporary difference of debt instruments measured at fair value, the carrying amount of an asset does not limit the estimation of probable future taxable profits. The application of these amendments has no material impact on the disclosures or the amounts recognized in the Group’s consolidated financial statements.
Description of reasons why applying new accounting policy provides reliable and more relevant information	There are several annual improvements in the current period, but the application of the amendments has had no material effect on the Group’s consolidated financial statements.

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Significant Basis Of Preparation And Accounting Policies_Not applied IFRS issued but are not yet effective (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Description of financial instruments exposed to expected impact of initial application of amendments to i f r s nine [Abstract]
Loans and receivables	₩ 267,106,204	$ 250,235,337	₩ 258,392,633
Held-to-maturity investments	16,749,296	15,691,383	13,910,251
Hybrid contracts in which the host contract, after separating the embedded derivatives, is a debt security	51,653
Financial assets available-for-sale	15,352,950	$ 14,383,232	20,817,583
Financial assets at FVTPL except derivatives	2,727,302
Financial liabilities designated at FVTPL	₩ 251,796		₩ 766,880	₩ 854,862
Enactments to IFRS 9 Financial Instruments
Description of expected impact of initial application of new standards or interpretations [Line Items]
Title of new IFRS	Financial Instruments
Explanation of not applied new standards or interpretations	The Group has not applied the above IFRSs that have been issued but are not yet effective
Description of nature of impending change in accounting policy	IFRS 9 issued in November 2009 introduced new requirements for the classification and measurement of financial assets. IFRS 9 was subsequently amended in October 2010 to include requirements for the classification and measurement of financial liabilities and for derecognition, and in November 2013 to include the new requirements for general hedge accounting. Another revised version of IFRS 9 was issued in July 2014 mainly to include a) impairment requirements for financial assets and b) limited amendments to the classification and measurement requirements by introducing a ‘fair value through other comprehensive income’(FVTOCI) measurement category for certain simple debt instruments. This standards supersedes IAS 39—Financial Instruments: Recognition and Measurement, and will be applied for annual periods beginning on or after January 1, 2018. In principle, IFRS 9 must be applied retrospectively. However, there are certain exemptions to the application of retroactive approach such as presenting comparative information on classification, measurement and impairment of financial instruments. In addition, IFRS 9 is applied prospectively for hedge accounting with exceptions such as accounting for the time value of options. The Group will apply the standard retrospectively, in accordance with IAS 8 “Accounting Policies, Changes in Accounting Estimates and Errors”, but will not restate previous periods provided that it is not possible to do so without the use of hindsight. Because of this, the Group will recognise any difference between the previous carrying amount and the carrying amount at the beginning of the annual reporting period that includes the date of initial application of IFRS 9 (January 1, 2018) in the opening retained earnings as of January 1, 2018. The Group has completed design and implementation the internal controls and/or financial reporting processes related to the presentation of financial instruments in order to adopt IFRS 9. The Group has completed a financial impact analysis on the 2017 financial statements based on available information as of year-end in order to determine the impact of adopting IFRS 9 for the first time.
Date by which application of new IFRS is required	Jan. 01, 2018
Date as at which entity plans to apply new IFRS initially	Jan. 01, 2018
Description of fact that impact of initial application of new IFRS is not known or reasonably estimable	Among the financial assets measured at amortized cost, loans and receivables and held-to-maturity financial assets amounting to 279,032 million Won and AFS financial assets amounting to 1,320,353 million Won would be reclassified to FVTPL financial assets as a result of adopting IFRS 9. As of year-end the Group holds financial liabilities amounting to 294,809,262 million Won, and out of this amount 251,796 million Won has been designated as FVTPL financial liabilities. In relation to these financial liabilities, the increase in fair value amounting to 31,275 million Won has been recognized as losses for the year ended 2017 in accordance with IAS 39. The results of the analysis conducted to determine the financial impact of applying IFRS 9 on FVTPL financial liabilities as of year-end show that the cumulative changes in fair value of FVTPL financial liabilities as a result of changes in credit risk amounted to 133 million Won.
Enactments to IFRS 15 Revenue from Contracts with Customers
Description of expected impact of initial application of new standards or interpretations [Line Items]
Title of new IFRS	Revenue from Contracts with Customers
Explanation of not applied new standards or interpretations	The Group has not applied the above IFRSs that have been issued but are not yet effective
Description of nature of impending change in accounting policy	The core principle under IFRS 15 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendments introduces a 5-step approach to revenue recognition and measurement: 1) Identify the contract with a customer, 2) Identify the performance obligations in the contract, 3) Determine the transaction price, 4) Allocate the transaction price to the performance obligations in the contract, 5) Recognize revenue when (or as) the entity satisfies a performance obligation. This standard will supersede IAS 11 - Construction Contracts, IAS 18- Revenue, IFRIC 13 - Customer Loyalty Programmes, IFRIC 15-Agreements for the Construction of Real Estate, IFRIC 18 - Transfers of Assets from Customers, and SIC 31-Revenue-Barter Transactions Involving Advertising Services.
Date by which application of new IFRS is required	Jan. 01, 2018
Date as at which entity plans to apply new IFRS initially	Jan. 01, 2018
Enactments to IFRS 16 Leases
Description of expected impact of initial application of new standards or interpretations [Line Items]
Title of new IFRS	Leases
Explanation of not applied new standards or interpretations	The Group has not applied the above IFRSs that have been issued but are not yet effective
Description of nature of impending change in accounting policy	IFRS 16 introduces a comprehensive model for the identification of lease arrangements and accountings treatments for both lessors and lessees. IFRS 16 will supersede the current lease guidance including IAS 17 Leases and the related interpretations.
Date by which application of new IFRS is required	Jan. 01, 2019
Date as at which entity plans to apply new IFRS initially	Jan. 01, 2019
Amendments to IFRS 2 Share-based Payment
Description of expected impact of initial application of new standards or interpretations [Line Items]
Title of new IFRS	Share-based Payment
Explanation of not applied new standards or interpretations	The Group has not applied the above IFRSs that have been issued but are not yet effective
Description of nature of impending change in accounting policy	The amendments include: 1) when measuring the fair value of share-based payment, the effects of vesting and non-vesting conditions on the measurement of cash-settled share-based payment should be consistent with the measurement of equity-settled share-based payment, 2) Share-based payment transaction in which the Group settles the share-based payment arrangement net by withholding a specified portion of the equity instruments per statutory tax withholding requirements would be classified as equity-settled in its entirety, if otherwise would be classified as equity-settled without the net settlement feature, and 3) when a cash-settled share-based payment changes to an equity-settled share-based payment because of modifications of the terms and conditions, the original liability recognized is derecognized and the equity-settled share-based payment is recognized at the modification date fair value. Any difference between the carrying amount of the liability at the modification date and the amount recognized in equity at the same date would be recognized in profit and loss immediately.
Date by which application of new IFRS is required	Jan. 01, 2018
Date as at which entity plans to apply new IFRS initially	Jan. 01, 2018
Amendments to IAS 40 Transfers of Investment Property
Description of expected impact of initial application of new standards or interpretations [Line Items]
Title of new IFRS	Transfers of Investment Property
Explanation of not applied new standards or interpretations	The Group has not applied the above IFRSs that have been issued but are not yet effective
Description of nature of impending change in accounting policy	The amendments clarify that a transfer to, or from, investment property necessitates an assessment of whether a property meets, or has ceased to meet, the definition of investment property, supported by observable evidence that a change in use has occurred. The amendments further clarify that situations other than the ones listed in IAS 40 may evidence a change in use, and that a change in use is possible for properties under construction (i.e. a change in use is not limited to completed properties).
Date by which application of new IFRS is required	Jan. 01, 2018
Date as at which entity plans to apply new IFRS initially	Jan. 01, 2018
Enactments to IFRIC 22 Foreign Currency Transactions and Advance Consideration
Description of expected impact of initial application of new standards or interpretations [Line Items]
Title of new IFRS	Foreign Currency Transactions and Advance Consideration
Explanation of not applied new standards or interpretations	The Group has not applied the above IFRSs that have been issued but are not yet effective
Description of nature of impending change in accounting policy	The interpretation addresses how to determine the ‘date of transaction’ for the purpose of determining the exchange rate to use on initial recognition of an asset, expense or income, when consideration for that item has been paid or received in advance in a foreign currency which resulted in the recognition of a non-monetary asset or non-monetary liability (e.g. a non-refundable deposit or deferred revenue). The interpretation specifies that the date of transaction is the date on which the entity initially recognizes the non-monetary asset on non-monetary liability arising from the payment or receipt of advance consideration. If there are multiple payments or receipts in advance, the interpretation requires an entity to determine the date of transaction for each payment or receipt of advance consideration.
Date by which application of new IFRS is required	Jan. 01, 2018
Date as at which entity plans to apply new IFRS initially	Jan. 01, 2018

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Significant Basis Of Preparation And Accounting Policies_K-IFRS 1109_estimated impact of adopting K-IFRS 1109 (Detail) ₩ in Millions	Dec. 31, 2017 KRW (₩)
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	₩ 303,765,995
Carrying Amount per IFRS 9	303,782,301
Loans and receivables (Deposits) | Amortized Cost
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	8,870,835
Carrying Amount per IFRS 9	8,870,835
Loans and receivables (Loans) | FVTPL
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	279,032
Carrying Amount per IFRS 9	280,001
Loans and receivables (Loans) | Amortized Cost
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	253,014,491
Carrying Amount per IFRS 9	253,014,491
Loans and receivables (Other financial assets) | Amortized Cost
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	6,772,088
Carrying Amount per IFRS 9	6,772,088
Financial assets at FVTPL (Deposits) | FVTPL
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	25,972
Carrying Amount per IFRS 9	25,972
Financial assets at FVTPL (Debt securities) | FVTPL
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	2,654,027
Carrying Amount per IFRS 9	2,654,027
Financial assets at FVTPL (Equity securities) | FVTPL
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	47,304
Carrying Amount per IFRS 9	47,304
AFS financial assets (Debt securities) | FVTPL
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	46,855
Carrying Amount per IFRS 9	46,855
AFS financial assets (Debt securities) | FVTOCI
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	12,874,209
Carrying Amount per IFRS 9	12,874,209
AFS financial assets (Debt securities) | Amortized Cost
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	308,181
Carrying Amount per IFRS 9	322,300
AFS financial assets (Equity securities) | FVTPL
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	1,273,498
Carrying Amount per IFRS 9	1,274,716
AFS financial assets (Equity securities) | FVTOCI
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	850,207
Carrying Amount per IFRS 9	850,207
Held-to-maturity financial assets (Debt securities) | Amortized Cost
Disclosure of the estimated impact on the classification and measurement of financial assets [Line Items]
Carrying Amount per IAS 39	16,749,296
Carrying Amount per IFRS 9	₩ 16,749,296

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Significant Basis Of Preparation And Accounting Policies_K-IFRS 1109_Expected Impact on the allowance for credit losses of adopting K-IFRS 1109 (Detail) ₩ in Millions	Dec. 31, 2017 KRW (₩)
Disclosure of the expected impact on the allowance for credit losses [Line Items]
Allowance for credit losses per IAS 39 (A)	₩ 2,079,605
Allowance for credit losses per IFRS 9 (B)	2,385,438
Increases (B-A)	305,833
Deposits
Disclosure of the expected impact on the allowance for credit losses [Line Items]
Allowance for credit losses per IAS 39 (A)	2,458
Allowance for credit losses per IFRS 9 (B)	3,092
Increases (B-A)	634
Debt securities
Disclosure of the expected impact on the allowance for credit losses [Line Items]
Allowance for credit losses per IFRS 9 (B)	9,331
Increases (B-A)	9,331
Available for sale debt securities
Disclosure of the expected impact on the allowance for credit losses [Line Items]
Allowance for credit losses per IFRS 9 (B)	4,253
Increases (B-A)	4,253
Held to maturity securities
Disclosure of the expected impact on the allowance for credit losses [Line Items]
Allowance for credit losses per IFRS 9 (B)	5,078
Increases (B-A)	5,078
Loan receivables and other financial assets
Disclosure of the expected impact on the allowance for credit losses [Line Items]
Allowance for credit losses per IAS 39 (A)	1,827,785
Allowance for credit losses per IFRS 9 (B)	2,075,752
Increases (B-A)	247,967
Guarantees
Disclosure of the expected impact on the allowance for credit losses [Line Items]
Allowance for credit losses per IAS 39 (A)	183,247
Allowance for credit losses per IFRS 9 (B)	192,376
Increases (B-A)	9,129
Loan commitments
Disclosure of the expected impact on the allowance for credit losses [Line Items]
Allowance for credit losses per IAS 39 (A)	66,115
Allowance for credit losses per IFRS 9 (B)	104,887
Increases (B-A)	₩ 38,772

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Significant Basis Of Preparation And Accounting Policies_Estimated economic useful lives for premises and equipment except for land (Details)	12 Months Ended
	Dec. 31, 2017
Buildings used for business purpose
Disclosure of property plant and equipment [Line Items]
Useful Life for property plant and equipment	35 to 57 years
Structures in leased office
Disclosure of property plant and equipment [Line Items]
Useful Life for property plant and equipment	4 to 5 years
Properties for business purpose
Disclosure of property plant and equipment [Line Items]
Useful Life for property plant and equipment	4 to 5 years
Leased assets
Disclosure of property plant and equipment [Line Items]
Useful Life for property plant and equipment	Useful lives of the same kind or similar other premises and equipment

XML

Significant Basis Of Preparation And Accounting Policies_Estimated useful life for intangible assets (Details)	12 Months Ended
	Dec. 31, 2017
Patents
Disclosure of intangible assets with indefinite useful life [Line Items]
Description and carrying amount of intangible assets with indefinite useful life	10 years
Development costs
Disclosure of intangible assets with indefinite useful life [Line Items]
Description and carrying amount of intangible assets with indefinite useful life	5 years
Software and others
Disclosure of intangible assets with indefinite useful life [Line Items]
Description and carrying amount of intangible assets with indefinite useful life	4 to 5 years

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Risk Management Maximum Exposure To Credit Risk (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial instruments [Line Items]
Total	₩ 396,559,830	₩ 393,116,368
Loans and receivables
Disclosure of financial instruments [Line Items]
Total	267,106,204	258,392,633
Korean treasury and government agencies
Disclosure of financial instruments [Line Items]
Total	8,823,584	16,058,305
Banks
Disclosure of financial instruments [Line Items]
Total	26,845,309	20,242,260
Corporates
Disclosure of financial instruments [Line Items]
Total	90,570,551	88,985,566
Consumers
Disclosure of financial instruments [Line Items]
Total	140,866,760	133,106,502
Financial assets at FVTPL
Disclosure of financial instruments [Line Items]
Total	5,795,774	5,573,739
Deposits indexed to gold prices
Disclosure of financial instruments [Line Items]
Total	25,972	26,180
Debt securities held for trading
Disclosure of financial instruments [Line Items]
Total	2,644,333	2,644,916
Financial assets designated at FVTPL
Disclosure of financial instruments [Line Items]
Total	9,694	4,348
Derivative assets for trading
Disclosure of financial instruments [Line Items]
Total	3,115,775	2,898,295
Available for sale debt securities
Disclosure of financial instruments [Line Items]
Total	13,229,244	16,541,888
Held to maturity securities
Disclosure of financial instruments [Line Items]
Total	16,749,296	13,910,251
Derivative assets for hedging
Disclosure of financial instruments [Line Items]
Total	59,272	140,577
Off balance sheet items
Disclosure of financial instruments [Line Items]
Total	93,620,040	98,557,280
Guarantees
Disclosure of financial instruments [Line Items]
Total	12,859,715	14,761,784
Loan commitments
Disclosure of financial instruments [Line Items]
Total	₩ 80,760,325	₩ 83,795,496

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Risk Management Credit risk exposure by geographical areas (Details) $ in Thousands, ₩ in Millions		Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Financial Assets Credit Exposure By Geographical Areas [Line Items]
Total		₩ 396,559,830		₩ 393,116,368
Categories of financial assets [Abstract]
Loans and receivables		267,106,204	$ 250,235,337	258,392,633
Financial assets at FVTPL		5,795,774		5,573,739
AFS debt securities		13,229,244		16,541,888
HTM securities		16,749,296	$ 15,691,383	13,910,251
Derivative assets for hedging		59,272		140,577
Off balance sheet item [Abstract]
Off-balance sheet items		93,620,040		98,557,280
Korea
Financial Assets Credit Exposure By Geographical Areas [Line Items]
Total		376,865,085		372,819,510
Categories of financial assets [Abstract]
Loans and receivables		250,678,479		241,380,250
Financial assets at FVTPL		5,551,870		5,205,849
AFS debt securities		12,407,602		16,155,290
HTM securities		16,606,692		13,758,863
Derivative assets for hedging		16,590		74,166
Off balance sheet item [Abstract]
Off-balance sheet items		91,603,852		96,245,092
China
Financial Assets Credit Exposure By Geographical Areas [Line Items]
Total		4,689,301		5,043,901
Categories of financial assets [Abstract]
Loans and receivables		4,104,912		4,286,018
Financial assets at FVTPL		2,937		6,525
AFS debt securities		52,259		13,845
Off balance sheet item [Abstract]
Off-balance sheet items		529,193		737,513
USA
Financial Assets Credit Exposure By Geographical Areas [Line Items]
Total		3,210,680		3,053,415
Categories of financial assets [Abstract]
Loans and receivables		2,823,247		2,792,088
AFS debt securities		151,131		137,861
HTM securities		63,732		20,336
Off balance sheet item [Abstract]
Off-balance sheet items		172,570		103,130
UK
Financial Assets Credit Exposure By Geographical Areas [Line Items]
Total		1,353,599		1,304,594
Categories of financial assets [Abstract]
Loans and receivables		1,094,988		895,874
Financial assets at FVTPL		148,955		261,547
Derivative assets for hedging		42,682		66,342
Off balance sheet item [Abstract]
Off-balance sheet items		66,974		80,831
Japan
Financial Assets Credit Exposure By Geographical Areas [Line Items]
Total		406,929		346,801
Categories of financial assets [Abstract]
Loans and receivables		381,890		323,470
Financial assets at FVTPL				81
Off balance sheet item [Abstract]
Off-balance sheet items		25,039		23,250
Others
Financial Assets Credit Exposure By Geographical Areas [Line Items]
Total	[1]	10,034,236		10,548,147
Categories of financial assets [Abstract]
Loans and receivables	[1]	8,022,688		8,714,933
Financial assets at FVTPL	[1]	92,012		99,737
AFS debt securities	[1]	618,252		234,892
HTM securities	[1]	78,872		131,052
Derivative assets for hedging	[1]			69
Off balance sheet item [Abstract]
Off-balance sheet items	[1]	₩ 1,222,412		₩ 1,367,464

[1] Others consist of financial assets in Indonesia, Vietnam, Panama and the European countries and others.

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Risk Management - Credit risk exposure by industries (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Financial Assets Credit Exposure By Industries [Line Items]
Total	₩ 396,559,830		₩ 393,116,368
Categories of financial assets [Abstract]
Loans and receivables	267,106,204	$ 250,235,337	258,392,633
Financial assets at FVTPL	5,795,774		5,573,739
AFS debt securities	13,229,244		16,541,888
HTM securities	16,749,296	$ 15,691,383	13,910,251
Derivative assets for hedging	59,272		140,577
Off balance sheet item [Abstract]
Off-balance sheet items	93,620,040		98,557,280
Service
Financial Assets Credit Exposure By Industries [Line Items]
Total	66,242,824		67,307,337
Categories of financial assets [Abstract]
Loans and receivables	47,192,641		46,040,278
Financial assets at FVTPL	100,766		77,198
AFS debt securities	707,737		1,092,279
HTM securities	1,348,754		1,673,971
Off balance sheet item [Abstract]
Off-balance sheet items	16,892,926		18,423,611
Manufacturing
Financial Assets Credit Exposure By Industries [Line Items]
Total	56,050,845		62,949,956
Categories of financial assets [Abstract]
Loans and receivables	34,502,509		35,652,974
Financial assets at FVTPL	83,239		360,881
AFS debt securities	37,719		57,781
Off balance sheet item [Abstract]
Off-balance sheet items	21,427,378		26,878,320
Finance and insurance
Financial Assets Credit Exposure By Industries [Line Items]
Total	71,094,693		69,732,303
Categories of financial assets [Abstract]
Loans and receivables	38,260,051		37,711,983
Financial assets at FVTPL	4,640,068		4,093,567
AFS debt securities	7,331,774		9,568,151
HTM securities	10,962,149		8,290,451
Derivative assets for hedging	59,272		140,577
Off balance sheet item [Abstract]
Off-balance sheet items	9,841,379		9,927,574
Construction
Financial Assets Credit Exposure By Industries [Line Items]
Total	7,882,046		8,750,546
Categories of financial assets [Abstract]
Loans and receivables	3,574,746		3,789,670
Financial assets at FVTPL	15,073		24,140
AFS debt securities	153,534		63,166
HTM securities	296,214		251,599
Off balance sheet item [Abstract]
Off-balance sheet items	3,842,479		4,621,971
Individuals
Financial Assets Credit Exposure By Industries [Line Items]
Total	170,023,881		159,163,281
Categories of financial assets [Abstract]
Loans and receivables	133,094,287		125,558,637
Financial assets at FVTPL	1,040		993
Off balance sheet item [Abstract]
Off-balance sheet items	36,928,554		33,603,651
Others
Financial Assets Credit Exposure By Industries [Line Items]
Total	25,265,541		25,212,945
Categories of financial assets [Abstract]
Loans and receivables	10,481,970		9,639,091
Financial assets at FVTPL	955,588		1,016,960
AFS debt securities	4,998,480		5,760,511
HTM securities	4,142,179		3,694,230
Off balance sheet item [Abstract]
Off-balance sheet items	₩ 4,687,324		₩ 5,102,153

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Risk Management Credit exposure of loans and receivables by customer and loan classification (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Composition of loans and receivables [Line Items]
Total net	₩ 267,106,204	$ 250,235,337	₩ 258,392,633
Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	268,936,446		260,419,729
Allowance for credit losses
Composition of loans and receivables [Line Items]
Total net	1,830,242		2,027,096
Loans and receivables neither overdue nor impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	265,692,069		256,994,673
Loans and receivables overdue but not impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	1,007,097		871,368
Impaired loans and receivables | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	2,237,280		2,553,688
Korean treasury and government agencies
Composition of loans and receivables [Line Items]
Total net	8,823,584		16,058,305
Korean treasury and government agencies | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	8,825,775		16,062,399
Korean treasury and government agencies | Allowance for credit losses
Composition of loans and receivables [Line Items]
Total net	2,191		4,094
Korean treasury and government agencies | Loans and receivables neither overdue nor impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	8,825,767		16,062,399
Korean treasury and government agencies | Loans and receivables overdue but not impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	8
Banks
Composition of loans and receivables [Line Items]
Total net	26,845,309		20,242,260
Banks | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	26,861,286		20,258,860
Banks | Allowance for credit losses
Composition of loans and receivables [Line Items]
Total net	15,977		16,600
Banks | Loans and receivables neither overdue nor impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	26,861,286		20,258,860
Corporates
Composition of loans and receivables [Line Items]
Total net	90,570,551		88,985,566
Corporates | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	91,947,571		90,626,843
Corporates | Allowance for credit losses
Composition of loans and receivables [Line Items]
Total net	1,377,020		1,641,277
Corporates | Loans and receivables neither overdue nor impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	90,118,609		88,478,409
Corporates | Loans and receivables overdue but not impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	128,683		105,539
Corporates | Impaired loans and receivables | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	1,700,279		2,042,895
General business
Composition of loans and receivables [Line Items]
Total net	50,852,126		50,112,214
General business | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	51,930,859		51,268,214
General business | Allowance for credit losses
Composition of loans and receivables [Line Items]
Total net	1,078,733		1,156,000
General business | Loans and receivables neither overdue nor impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	50,463,112		49,815,352
General business | Loans and receivables overdue but not impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	65,616		48,294
General business | Impaired loans and receivables | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	1,402,131		1,404,568
Small and medium sized enterprise
Composition of loans and receivables [Line Items]
Total net	34,154,883		31,583,675
Small and medium sized enterprise | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	34,422,045		32,007,817
Small and medium sized enterprise | Allowance for credit losses
Composition of loans and receivables [Line Items]
Total net	267,162		424,142
Small and medium sized enterprise | Loans and receivables neither overdue nor impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	34,107,547		31,520,617
Small and medium sized enterprise | Loans and receivables overdue but not impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	63,067		57,245
Small and medium sized enterprise | Impaired loans and receivables | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	251,431		429,955
Project financing and others
Composition of loans and receivables [Line Items]
Total net	5,563,542		7,289,677
Project financing and others | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	5,594,667		7,350,812
Project financing and others | Allowance for credit losses
Composition of loans and receivables [Line Items]
Total net	31,125		61,135
Project financing and others | Loans and receivables neither overdue nor impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	5,547,950		7,142,440
Project financing and others | Impaired loans and receivables | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	46,717		208,372
Consumers
Composition of loans and receivables [Line Items]
Total net	140,866,760		133,106,502
Consumers | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	141,301,814		133,471,627
Consumers | Allowance for credit losses
Composition of loans and receivables [Line Items]
Total net	435,054		365,125
Consumers | Loans and receivables neither overdue nor impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	139,886,407		132,195,005
Consumers | Loans and receivables overdue but not impaired | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	878,406		765,829
Consumers | Impaired loans and receivables | Gross loans and receivables
Composition of loans and receivables [Line Items]
Total net	₩ 537,001		₩ 510,793

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Risk Management Credit quality of loans and receivables under internal rating system by customer (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2017	Dec. 31, 2016
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired		₩ 265,057,120	₩ 256,165,729
Value of collateral	[1]	167,037,736	158,906,208
Allowance account for credit losses of financial assets loans and receivables neither past due nor impaired		634,949	828,944
Upper grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[2]	242,991,218	230,228,981
Lower grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[3]	22,065,902	25,936,748
Korean treasury and government agencies
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired		8,823,576	16,058,305
Value of collateral	[1]	1,409
Korean treasury and government agencies | Upper grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[2]	8,823,576	16,058,288
Korean treasury and government agencies | Lower grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[3]		17
Banks
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired		26,845,309	20,242,260
Value of collateral	[1]	483,469	358,456
Banks | Upper grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[2]	26,845,309	20,242,260
Corporates
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired		89,659,709	87,810,227
Value of collateral	[1]	52,111,221	47,492,842
Corporates | Upper grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[2]	71,428,837	65,554,416
Corporates | Lower grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[3]	18,230,872	22,255,811
General business
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired		50,178,734	49,403,291
Value of collateral	[1]	19,868,185	18,003,674
General business | Upper grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[2]	43,613,460	41,461,420
General business | Lower grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[3]	6,565,274	7,941,871
Small and medium sized enterprise
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired		33,958,689	31,306,245
Value of collateral	[1]	29,600,362	25,493,006
Small and medium sized enterprise | Upper grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[2]	23,191,627	18,755,963
Small and medium sized enterprise | Lower grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[3]	10,767,062	12,550,282
Project financing and others
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired		5,522,286	7,100,691
Value of collateral	[1]	2,642,674	3,996,162
Project financing and others | Upper grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[2]	4,623,750	5,337,033
Project financing and others | Lower grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[3]	898,536	1,763,658
Consumers
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired		139,728,526	132,054,937
Value of collateral	[1]	114,441,637	111,054,910
Consumers | Upper grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[2]	135,893,496	128,374,017
Consumers | Lower grade
Loans and receivables neither past due nor impaired [Line Items]
Total loans and receivables neither overdue nor impaired	[3]	₩ 3,835,030	₩ 3,680,920

[1] The value of collateral is the allocated collateral amount when estimating the allowance for credit losses.

[2] AAA~BBB for Corporates, and 1~6 level for Consumers

[3] BBB- ~C for Corporates, and 7~10 level for Consumers

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Risk Management_Aging analysis of loans and receivables pastdue but not impaired net of allowance (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2017	Dec. 31, 2016
Total [Line Items]
Value of collateral		₩ 956,517	₩ 823,972
Securities held as collateral at fair value for loans and receivables past due but not impaired	[1]	670,999	598,489
Allowance account for credit losses of financial assets loans and receivables past due but not impaired		50,580	47,396
Less than 30 days
Total [Line Items]
Value of collateral		791,015	671,579
30 to 59 days
Total [Line Items]
Value of collateral		104,628	100,782
60 to 89 days
Total [Line Items]
Value of collateral		60,874	51,611
Korean treasury and government agencies
Total [Line Items]
Value of collateral		8
Korean treasury and government agencies | Less than 30 days
Total [Line Items]
Value of collateral		8
Corporates
Total [Line Items]
Value of collateral		123,677	99,530
Securities held as collateral at fair value for loans and receivables past due but not impaired	[1]	51,132	52,325
Corporates | Less than 30 days
Total [Line Items]
Value of collateral		107,562	86,584
Corporates | 30 to 59 days
Total [Line Items]
Value of collateral		10,252	10,486
Corporates | 60 to 89 days
Total [Line Items]
Value of collateral		5,863	2,460
General business
Total [Line Items]
Value of collateral		64,190	47,145
Securities held as collateral at fair value for loans and receivables past due but not impaired	[1]	4,619	7,021
General business | Less than 30 days
Total [Line Items]
Value of collateral		59,560	45,255
General business | 30 to 59 days
Total [Line Items]
Value of collateral		3,702	1,553
General business | 60 to 89 days
Total [Line Items]
Value of collateral		928	337
Small and medium sized enterprise
Total [Line Items]
Value of collateral		59,487	52,385
Securities held as collateral at fair value for loans and receivables past due but not impaired	[1]	46,513	45,304
Small and medium sized enterprise | Less than 30 days
Total [Line Items]
Value of collateral		48,002	41,329
Small and medium sized enterprise | 30 to 59 days
Total [Line Items]
Value of collateral		6,550	8,933
Small and medium sized enterprise | 60 to 89 days
Total [Line Items]
Value of collateral		4,935	2,123
Consumers
Total [Line Items]
Value of collateral		832,832	724,442
Securities held as collateral at fair value for loans and receivables past due but not impaired	[1]	619,867	546,164
Consumers | Less than 30 days
Total [Line Items]
Value of collateral		683,445	584,995
Consumers | 30 to 59 days
Total [Line Items]
Value of collateral		94,376	90,296
Consumers | 60 to 89 days
Total [Line Items]
Value of collateral		₩ 55,011	₩ 49,151

[1] The value of collateral held is the recoverable amount used when calculating allowance for credit losses.

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Risk Management_Details of loans and receivables pastdue and impaired net of allowance (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2017	Dec. 31, 2016
Loans and receivable impaired [Line Items]
Impaired loans		₩ 1,092,567	₩ 1,402,932
Value of collateral	[1]	951,981	1,012,383
Allowance account for credit losses of financial assets loans and receivables that are individually determined to be impaired		1,144,713	1,150,756
Corporates
Loans and receivable impaired [Line Items]
Impaired loans		787,165	1,075,809
Value of collateral	[1]	724,015	761,800
General business
Loans and receivable impaired [Line Items]
Impaired loans		609,202	661,778
Value of collateral	[1]	562,638	482,680
Small and medium sized enterprise
Loans and receivable impaired [Line Items]
Impaired loans		136,707	225,045
Value of collateral	[1]	141,026	236,954
Project financing and others
Loans and receivable impaired [Line Items]
Impaired loans		41,256	188,986
Value of collateral	[1]	20,351	42,166
Consumers
Loans and receivable impaired [Line Items]
Impaired loans		305,402	327,123
Value of collateral	[1]	₩ 227,966	₩ 250,583

[1] The value of collateral held is the recoverable amount used when calculating allowance for credit losses.

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Risk Management_Credit soundness of debt securities (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Financial assets of debt securities [Line Items]
Financial assets at FVTPL	[1]	₩ 2,654,027	₩ 2,649,264
AFS debt securities		13,229,244	16,541,888
HTM securities		16,749,296	13,910,251
Total		₩ 32,632,567	₩ 33,101,403
Description of rating agencies used		External Credit Assessment Institution (“ECAI”), Korea’s qualified external rating agency	External Credit Assessment Institution (“ECAI”), Korea’s qualified external rating agency
AAA
Financial assets of debt securities [Line Items]
Financial assets at FVTPL	[1]	₩ 1,685,099	₩ 1,658,332
AFS debt securities		9,897,689	12,490,934
HTM securities		15,806,327	13,342,384
Total		27,389,115	27,491,650
From AA minus to AA plus
Financial assets of debt securities [Line Items]
Financial assets at FVTPL	[1]	722,923	720,535
AFS debt securities		2,386,567	3,372,310
HTM securities		888,547	466,401
Total		3,998,037	4,559,246
From BBB minus to A plus
Financial assets of debt securities [Line Items]
Financial assets at FVTPL	[1]	236,311	266,049
AFS debt securities		876,482	618,736
HTM securities		52,188	101,466
Total		1,164,981	986,251
Below BBB minus
Financial assets of debt securities [Line Items]
Financial assets at FVTPL	[1]	9,694	4,348
AFS debt securities		68,506	59,908
HTM securities		2,234
Total		₩ 80,434	₩ 64,256

[1] Financial assets at FVTPL comprise debt securities held for trading and financial assets designated at FVTPL.

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Risk Management_Sensitivity Analysis of Market Risk (Details)	12 Months Ended
	Dec. 31, 2017
Sensitivity analysis for market risk [Abstract]
Methods used in preparing sensitivity analysis reflecting interdependencies between risk variables	The Group performs the sensitivity analyses both for trading and for non-trading activities. For the trading activities, the Group uses a VaR model that uses certain assumptions of possible fluctuations in market conditions and, by conducting simulations of gains and losses, under which the model estimates the maximum losses that may occur. For the non-trading activities, interest rate Earning at Risk (“EaR”) and interest rate VaR, which is based on the simulations of the Net Interest Income (“NII”) and Net Present Value (“NPV”), are calculated for the Bank, and the risks for all other subsidiaries are measured and managed by the interest rate EaR and the interest rate VaR calculations based on the Bank for International Settlements (“BIS”) Framework.
Limitations that may result in information not fully reflecting fair value of assets and liabilities involved	A VaR model predicts based on statistics of possible losses on the portfolio at a certain period currently or in the future. It indicates the maximum expected loss with at least 99% credibility. In short, there exists a one percent possibility that the actual loss might exceed the predicted loss generated from the VaR calculation. The actual results are periodically monitored to examine the validity of the assumptions and variables and factors that are used in VaR calculations. However, this approach cannot prevent the loss when the market fluctuation exceeds expectation.
Methods and assumptions used in preparing sensitivity analysis	A VaR model predicts based on statistics of possible losses on the portfolio at a certain period currently or in the future. It indicates the maximum expected loss with at least 99% credibility. NII is a profit based indicator for displaying profit changes in the short term due to short term interest changes. It will be estimated as subtracting interest expenses of liabilities from the interest income of assets. NPV is an indicator for displaying risks in economic view according to unfavorable changes related to interest rate. It will be estimated as subtracting the present value of liabilities from the present value of assets. EaR shows the maximum profit-loss amount, which indicates the maximum deduction amount caused by the unfavorable changes related to the interest rate of a certain period (i.e. 1 year). Interest rate VaR shows the potential maximum loss generated by the unfavorable changes during a certain period of time in the present or future.

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Risk Management_Value at risk analysis for trading activities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair value concentration of risk market risk management reporting date value at risk [Member]
Value at risk [Line Items]
Total VaR	₩ 5,370	₩ 6,359
Fair value concentration of risk market risk management value at risk during year [Member] | Average
Value at risk [Line Items]
Total VaR	7,123	5,972
Fair value concentration of risk market risk management value at risk during year [Member] | Maximum
Value at risk [Line Items]
Total VaR	9,363	9,119
Fair value concentration of risk market risk management value at risk during year [Member] | Minimum
Value at risk [Line Items]
Total VaR	5,370	3,625
Interest rate | Fair value concentration of risk market risk management reporting date value at risk [Member]
Value at risk [Line Items]
Total VaR	4,183	3,250
Interest rate | Fair value concentration of risk market risk management value at risk during year [Member] | Average
Value at risk [Line Items]
Total VaR	3,799	2,844
Interest rate | Fair value concentration of risk market risk management value at risk during year [Member] | Maximum
Value at risk [Line Items]
Total VaR	4,918	6,430
Interest rate | Fair value concentration of risk market risk management value at risk during year [Member] | Minimum
Value at risk [Line Items]
Total VaR	2,467	1,367
Stock price | Fair value concentration of risk market risk management reporting date value at risk [Member]
Value at risk [Line Items]
Total VaR	909	4,191
Stock price | Fair value concentration of risk market risk management value at risk during year [Member] | Average
Value at risk [Line Items]
Total VaR	2,863	3,456
Stock price | Fair value concentration of risk market risk management value at risk during year [Member] | Maximum
Value at risk [Line Items]
Total VaR	4,419	5,063
Stock price | Fair value concentration of risk market risk management value at risk during year [Member] | Minimum
Value at risk [Line Items]
Total VaR	909	2,304
Foreign currencies | Fair value concentration of risk market risk management reporting date value at risk [Member]
Value at risk [Line Items]
Total VaR	4,750	4,396
Foreign currencies | Fair value concentration of risk market risk management value at risk during year [Member] | Average
Value at risk [Line Items]
Total VaR	5,051	4,914
Foreign currencies | Fair value concentration of risk market risk management value at risk during year [Member] | Maximum
Value at risk [Line Items]
Total VaR	6,636	7,686
Foreign currencies | Fair value concentration of risk market risk management value at risk during year [Member] | Minimum
Value at risk [Line Items]
Total VaR	4,061	3,967
Commodity price | Fair value concentration of risk market risk management reporting date value at risk [Member]
Value at risk [Line Items]
Total VaR		152
Commodity price | Fair value concentration of risk market risk management value at risk during year [Member] | Average
Value at risk [Line Items]
Total VaR	31	113
Commodity price | Fair value concentration of risk market risk management value at risk during year [Member] | Maximum
Value at risk [Line Items]
Total VaR	188	325
Commodity price | Fair value concentration of risk market risk management value at risk during year [Member] | Minimum
Value at risk [Line Items]
Total VaR		21
Diversification | Fair value concentration of risk market risk management reporting date value at risk [Member]
Value at risk [Line Items]
Total VaR	(4,472)	(5,630)
Diversification | Fair value concentration of risk market risk management value at risk during year [Member] | Average
Value at risk [Line Items]
Total VaR	(4,621)	(5,355)
Diversification | Fair value concentration of risk market risk management value at risk during year [Member] | Maximum
Value at risk [Line Items]
Total VaR	(6,798)	(10,385)
Diversification | Fair value concentration of risk market risk management value at risk during year [Member] | Minimum
Value at risk [Line Items]
Total VaR	₩ (2,067)	₩ (4,034)

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Risk Management_Net Interest Income and Net Portfolio Value Analysis according to interest changing scenario for assets and liabilities held by the Bank (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Base case
Sensitivity analysis of market risk for non trading activities [Line Items]
NII	₩ 4,916,138	₩ 4,367,411
NPV	23,472,792	21,556,632
Base case (Prepay)
Sensitivity analysis of market risk for non trading activities [Line Items]
NII	4,916,015	4,384,783
NPV	23,163,942	20,666,425
IR 100bp up
Sensitivity analysis of market risk for non trading activities [Line Items]
NII	5,361,546	4,802,118
NPV	22,886,122	20,893,490
IR 100bp down
Sensitivity analysis of market risk for non trading activities [Line Items]
NII	4,386,437	3,903,129
NPV	24,127,559	22,279,204
IR 200bp up
Sensitivity analysis of market risk for non trading activities [Line Items]
NII	5,806,723	5,236,879
NPV	22,372,208	20,289,742
IR 200bp down
Sensitivity analysis of market risk for non trading activities [Line Items]
NII	3,452,590	2,975,351
NPV	24,830,482	23,052,848
IR 300bp up
Sensitivity analysis of market risk for non trading activities [Line Items]
NII	6,251,897	5,671,639
NPV	21,929,189	19,742,627
IR 300bp down
Sensitivity analysis of market risk for non trading activities [Line Items]
NII	2,254,609	1,968,273
NPV	₩ 26,633,807	₩ 25,096,193

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Risk Management_Interest Earning at Risk and Interest Value at Risk based on BIS Framework for subsidiaries other than bank (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of sensitivity analysis of market risk for non trading activities of subsidiaries other than bank [Abstract]
EaR	₩ 255,679	₩ 188,381
VaR	₩ 130,821	₩ 110,335

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Risk Management_Cash flows of principal amounts and interests from interest bearing assets and liabilities by repricing date (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Asset
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	₩ 328,925,492	₩ 329,221,818
Loans and receivables
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	297,775,378	297,175,532
AFS financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	13,866,019	17,625,340
HTM financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	17,284,095	14,420,946
Liability
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	279,659,987	265,532,652
Deposits due to customers
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	234,879,069	221,266,305
Borrowings
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	14,961,062	18,915,461
Debentures
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	29,819,856	25,350,886
Within 3 months | Asset
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	166,090,779	154,172,523
Within 3 months | Loans and receivables
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	161,653,892	148,237,350
Within 3 months | AFS financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	2,150,708	3,165,094
Within 3 months | HTM financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	2,286,179	2,770,079
Within 3 months | Liability
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	118,636,715	115,933,766
Within 3 months | Deposits due to customers
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	106,815,564	100,051,821
Within 3 months | Borrowings
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	9,865,249	13,772,710
Within 3 months | Debentures
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	1,955,902	2,109,235
4 to 6 months | Asset
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	46,333,100	46,494,872
4 to 6 months | Loans and receivables
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	41,671,530	42,032,667
4 to 6 months | AFS financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	2,500,103	2,946,992
4 to 6 months | HTM financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	2,161,467	1,515,213
4 to 6 months | Liability
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	41,259,186	39,736,958
4 to 6 months | Deposits due to customers
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	37,750,367	36,614,529
4 to 6 months | Borrowings
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	1,056,579	1,044,748
4 to 6 months | Debentures
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	2,452,240	2,077,681
7 to 9 months | Asset
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	11,064,295	12,165,519
7 to 9 months | Loans and receivables
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	7,614,159	8,064,502
7 to 9 months | AFS financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	2,016,711	2,854,514
7 to 9 months | HTM financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	1,433,425	1,246,503
7 to 9 months | Liability
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	26,549,085	26,380,163
7 to 9 months | Deposits due to customers
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	25,117,556	25,028,378
7 to 9 months | Borrowings
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	412,966	491,330
7 to 9 months | Debentures
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	1,018,563	860,455
10 to 12 months | Asset
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	10,466,965	11,815,483
10 to 12 months | Loans and receivables
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	6,411,841	7,757,087
10 to 12 months | AFS financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	2,367,762	2,915,226
10 to 12 months | HTM financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	1,687,362	1,143,170
10 to 12 months | Liability
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	29,775,736	26,932,210
10 to 12 months | Deposits due to customers
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	27,585,458	25,017,836
10 to 12 months | Borrowings
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	437,431	368,431
10 to 12 months | Debentures
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	1,752,847	1,545,943
1 to 5 years | Asset
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	67,749,792	67,722,061
1 to 5 years | Loans and receivables
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	54,150,998	55,838,192
1 to 5 years | AFS financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	4,229,000	5,029,918
1 to 5 years | HTM financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	9,369,794	6,853,951
1 to 5 years | Liability
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	59,998,426	51,943,368
1 to 5 years | Deposits due to customers
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	37,518,878	34,513,004
1 to 5 years | Borrowings
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	2,709,010	2,816,565
1 to 5 years | Debentures
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	19,770,538	14,613,799
Over 5 years | Asset
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	27,220,561	36,851,360
Over 5 years | Loans and receivables
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	26,272,958	35,245,734
Over 5 years | AFS financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	601,735	713,596
Over 5 years | HTM financial assets
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing assets	345,868	892,030
Over 5 years | Liability
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	3,440,839	4,606,187
Over 5 years | Deposits due to customers
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	91,246	40,737
Over 5 years | Borrowings
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	479,827	421,677
Over 5 years | Debentures
Cash flows of principal and interests from interest baring assets and liabilities [Line Items]
Cash flows of principal and interests from interest bearing liabilities	₩ 2,869,766	₩ 4,143,773

XML

Risk Management_Foreign currency risk exposure of financial instruments in foreign currency (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Won equivalent | Asset
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	₩ 38,225,444	₩ 40,690,067
Won equivalent | Loans and receivables
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	35,392,763	39,130,033
Won equivalent | Financial assets at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	174,016	151,661
Won equivalent | AFS financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	2,461,622	1,244,321
Won equivalent | HTM financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	197,043	164,052
Won equivalent | Liability
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	39,450,921	39,035,948
Won equivalent | Financial liabilities at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	139,030	320,607
Won equivalent | Deposits due to customer
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	23,682,896	21,453,096
Won equivalent | Borrowings
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	7,659,733	9,122,643
Won equivalent | Debentures
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	4,204,715	3,891,771
Won equivalent | Other financial liabilities
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	3,764,547	4,247,831
Won equivalent | Off-balance accounts
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Off balance accounts	9,899,126	11,651,382
USD | Foreign currency | Asset
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	25,109	23,849
USD | Foreign currency | Loans and receivables
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	23,000	22,868
USD | Foreign currency | Financial assets at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	32	66
USD | Foreign currency | AFS financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	1,966	898
USD | Foreign currency | HTM financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	111	17
USD | Foreign currency | Liability
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	26,248	23,728
USD | Foreign currency | Financial liabilities at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	41	75
USD | Foreign currency | Deposits due to customer
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	13,744	11,294
USD | Foreign currency | Borrowings
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	6,604	7,193
USD | Foreign currency | Debentures
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	3,467	2,931
USD | Foreign currency | Other financial liabilities
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	2,392	2,235
USD | Foreign currency | Off-balance accounts
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Off balance accounts	8,108	8,593
USD | Won equivalent | Asset
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	26,902,043	28,820,981
USD | Won equivalent | Loans and receivables
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	24,642,900	27,635,970
USD | Won equivalent | Financial assets at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	34,303	79,386
USD | Won equivalent | AFS financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	2,105,972	1,085,108
USD | Won equivalent | HTM financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	118,868	20,517
USD | Won equivalent | Liability
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	28,126,378	28,674,901
USD | Won equivalent | Financial liabilities at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	43,423	90,908
USD | Won equivalent | Deposits due to customer
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	14,725,686	13,648,729
USD | Won equivalent | Borrowings
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	7,080,118	8,692,792
USD | Won equivalent | Debentures
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	3,714,411	3,541,769
USD | Won equivalent | Other financial liabilities
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	2,562,740	2,700,703
USD | Won equivalent | Off-balance accounts
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Off balance accounts	8,687,009	10,384,163
JPY | Foreign currency | Asset
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	126,969	109,001
JPY | Foreign currency | Loans and receivables
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	126,944	108,944
JPY | Foreign currency | Financial assets at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	25	57
JPY | Foreign currency | Liability
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	213,598	140,676
JPY | Foreign currency | Financial liabilities at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	79	253
JPY | Foreign currency | Deposits due to customer
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	195,176	124,790
JPY | Foreign currency | Borrowings
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	2,218	3,243
JPY | Foreign currency | Other financial liabilities
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	16,125	12,390
JPY | Foreign currency | Off-balance accounts
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Off balance accounts	33,624	28,675
JPY | Won equivalent | Asset
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	1,205,081	1,130,128
JPY | Won equivalent | Loans and receivables
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	1,204,843	1,129,539
JPY | Won equivalent | Financial assets at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	238	589
JPY | Won equivalent | Liability
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	2,027,291	1,458,545
JPY | Won equivalent | Financial liabilities at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	752	2,621
JPY | Won equivalent | Deposits due to customer
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	1,852,440	1,293,835
JPY | Won equivalent | Borrowings
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	21,056	33,625
JPY | Won equivalent | Other financial liabilities
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	153,043	128,464
JPY | Won equivalent | Off-balance accounts
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Off balance accounts	319,127	297,304
CNY | Foreign currency | Asset
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	25,543	23,274
CNY | Foreign currency | Loans and receivables
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	25,224	23,194
CNY | Foreign currency | AFS financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	319	80
CNY | Foreign currency | Liability
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	24,367	21,158
CNY | Foreign currency | Deposits due to customer
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	21,865	18,950
CNY | Foreign currency | Debentures
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	700	700
CNY | Foreign currency | Other financial liabilities
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	1,802	1,508
CNY | Foreign currency | Off-balance accounts
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Off balance accounts	1,199	1,061
CNY | Won equivalent | Asset
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	4,180,195	4,032,522
CNY | Won equivalent | Loans and receivables
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	4,127,936	4,018,678
CNY | Won equivalent | AFS financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	52,259	13,844
CNY | Won equivalent | Liability
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	3,987,647	3,665,851
CNY | Won equivalent | Deposits due to customer
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	3,578,142	3,283,291
CNY | Won equivalent | Debentures
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	114,555	121,282
CNY | Won equivalent | Other financial liabilities
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	294,950	261,278
CNY | Won equivalent | Off-balance accounts
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Off balance accounts	196,261	183,883
EUR | Foreign currency | Asset
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	1,183	1,578
EUR | Foreign currency | Loans and receivables
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	1,156	1,548
EUR | Foreign currency | Financial assets at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	27	30
EUR | Foreign currency | Liability
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	1,278	1,206
EUR | Foreign currency | Financial liabilities at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	19	88
EUR | Foreign currency | Deposits due to customer
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	883	651
EUR | Foreign currency | Borrowings
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	247	222
EUR | Foreign currency | Other financial liabilities
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	129	245
EUR | Foreign currency | Off-balance accounts
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Off balance accounts	406	374
EUR | Won equivalent | Asset
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	1,514,524	2,000,988
EUR | Won equivalent | Loans and receivables
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	1,479,351	1,962,856
EUR | Won equivalent | Financial assets at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	34,583	37,562
EUR | Won equivalent | AFS financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	590	570
EUR | Won equivalent | Liability
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	1,635,554	1,527,553
EUR | Won equivalent | Financial liabilities at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	24,878	111,098
EUR | Won equivalent | Deposits due to customer
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	1,129,802	825,165
EUR | Won equivalent | Borrowings
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	315,685	280,894
EUR | Won equivalent | Other financial liabilities
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	165,189	310,396
EUR | Won equivalent | Off-balance accounts
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Off balance accounts	519,843	473,845
Others | Won equivalent | Asset
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	4,423,601	4,705,448
Others | Won equivalent | Loans and receivables
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	3,937,733	4,382,990
Others | Won equivalent | Financial assets at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	104,892	34,124
Others | Won equivalent | AFS financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	302,801	144,799
Others | Won equivalent | HTM financial assets
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial assets denominated in foregin currencies	78,175	143,535
Others | Won equivalent | Liability
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	3,674,051	3,709,098
Others | Won equivalent | Financial liabilities at FVTPL
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	69,977	115,980
Others | Won equivalent | Deposits due to customer
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	2,396,826	2,402,076
Others | Won equivalent | Borrowings
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	242,874	115,332
Others | Won equivalent | Debentures
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	375,749	228,720
Others | Won equivalent | Other financial liabilities
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Financial liabilities denominated in foregin currencies	588,625	846,990
Others | Won equivalent | Off-balance accounts
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]
Off balance accounts	₩ 176,886	₩ 312,187

XML

Risk Management_Cash flow from principal and interest payments of nonderivative financial liabilities by remaining contractual maturities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities by remaining contractual maturity [Line Items]
Nonderivative financial liabilities undiscounted cash flows by remaining contractual maturity	₩ 293,613,146	₩ 287,507,640
Financial liabilities at FVTPL	327,030	834,808
Deposits due to customers	238,249,257	224,666,969
Borrowings	15,080,533	18,997,770
Debentures	29,811,344	25,323,071
Other financial liabilities	10,144,982	17,685,022
Within 3 months
Disclosure of maturity analysis for derivative financial liabilities by remaining contractual maturity [Line Items]
Nonderivative financial liabilities undiscounted cash flows by remaining contractual maturity	163,369,548	163,583,751
Financial liabilities at FVTPL	168,442	678,813
Deposits due to customers	148,008,777	136,835,315
Borrowings	6,115,732	9,146,895
Debentures	1,955,255	2,108,780
Other financial liabilities	7,121,342	14,813,948
4 to 6 months
Disclosure of maturity analysis for derivative financial liabilities by remaining contractual maturity [Line Items]
Nonderivative financial liabilities undiscounted cash flows by remaining contractual maturity	34,227,903	33,147,269
Financial liabilities at FVTPL	155,984	1,529
Deposits due to customers	29,563,310	28,685,473
Borrowings	1,893,173	2,355,336
Debentures	2,452,565	2,077,387
Other financial liabilities	162,871	27,544
7 to 9 months
Disclosure of maturity analysis for derivative financial liabilities by remaining contractual maturity [Line Items]
Nonderivative financial liabilities undiscounted cash flows by remaining contractual maturity	20,685,876	20,997,114
Financial liabilities at FVTPL	1,717	94
Deposits due to customers	18,175,348	19,254,108
Borrowings	1,489,272	876,836
Debentures	1,018,714	860,596
Other financial liabilities	825	5,480
10 to 12 months
Disclosure of maturity analysis for derivative financial liabilities by remaining contractual maturity [Line Items]
Nonderivative financial liabilities undiscounted cash flows by remaining contractual maturity	35,392,463	33,882,676
Financial liabilities at FVTPL	512	47
Deposits due to customers	32,468,110	30,875,962
Borrowings	1,178,107	1,486,710
Debentures	1,744,731	1,518,524
Other financial liabilities	1,003	1,433
1 to 5 years
Disclosure of maturity analysis for derivative financial liabilities by remaining contractual maturity [Line Items]
Nonderivative financial liabilities undiscounted cash flows by remaining contractual maturity	31,233,494	25,875,498
Financial liabilities at FVTPL	375	154,325
Deposits due to customers	7,409,118	6,284,092
Borrowings	3,924,681	4,711,273
Debentures	19,770,380	14,641,016
Other financial liabilities	128,940	84,792
Over 5 years
Disclosure of maturity analysis for derivative financial liabilities by remaining contractual maturity [Line Items]
Nonderivative financial liabilities undiscounted cash flows by remaining contractual maturity	8,703,862	10,021,332
Deposits due to customers	2,624,594	2,732,019
Borrowings	479,568	420,720
Debentures	2,869,699	4,116,768
Other financial liabilities	₩ 2,730,001	₩ 2,751,825

XML

Risk Management_Cash flow from principal and interest payments of nonderivative financial liabilities by estimated redemption or withdrawal (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities by estimated redemption or withdrawal [Line Items]
Nonderivative financial liabilities undiscounted cash flows by estimated redemption or withdrawal	₩ 293,237,280	₩ 287,102,515
Financial liabilities at FVTPL	327,030	834,808
Deposits due to customers	237,873,391	224,261,844
Borrowings	15,080,533	18,997,770
Debentures	29,811,344	25,323,071
Other financial liabilities	10,144,982	17,685,022
Within 3 months
Disclosure of maturity analysis for derivative financial liabilities by estimated redemption or withdrawal [Line Items]
Nonderivative financial liabilities undiscounted cash flows by estimated redemption or withdrawal	174,507,373	174,837,797
Financial liabilities at FVTPL	168,442	678,813
Deposits due to customers	159,146,602	148,089,355
Borrowings	6,115,732	9,146,901
Debentures	1,955,255	2,108,780
Other financial liabilities	7,121,342	14,813,948
4 to 6 months
Disclosure of maturity analysis for derivative financial liabilities by estimated redemption or withdrawal [Line Items]
Nonderivative financial liabilities undiscounted cash flows by estimated redemption or withdrawal	35,963,155	34,625,763
Financial liabilities at FVTPL	155,984	1,529
Deposits due to customers	31,298,562	30,163,971
Borrowings	1,893,173	2,355,332
Debentures	2,452,565	2,077,387
Other financial liabilities	162,871	27,544
7 to 9 months
Disclosure of maturity analysis for derivative financial liabilities by estimated redemption or withdrawal [Line Items]
Nonderivative financial liabilities undiscounted cash flows by estimated redemption or withdrawal	19,177,658	19,343,808
Financial liabilities at FVTPL	1,717	94
Deposits due to customers	16,667,130	17,600,803
Borrowings	1,489,272	876,835
Debentures	1,018,714	860,596
Other financial liabilities	825	5,480
10 to 12 months
Disclosure of maturity analysis for derivative financial liabilities by estimated redemption or withdrawal [Line Items]
Nonderivative financial liabilities undiscounted cash flows by estimated redemption or withdrawal	24,919,647	23,954,049
Financial liabilities at FVTPL	512	47
Deposits due to customers	21,995,294	20,947,335
Borrowings	1,178,107	1,486,710
Debentures	1,744,731	1,518,524
Other financial liabilities	1,003	1,433
1 to 5 years
Disclosure of maturity analysis for derivative financial liabilities by estimated redemption or withdrawal [Line Items]
Nonderivative financial liabilities undiscounted cash flows by estimated redemption or withdrawal	30,311,423	24,719,793
Financial liabilities at FVTPL	375	154,325
Deposits due to customers	6,487,047	5,128,387
Borrowings	3,924,681	4,711,273
Debentures	19,770,380	14,641,016
Other financial liabilities	128,940	84,792
Over 5 years
Disclosure of maturity analysis for derivative financial liabilities by estimated redemption or withdrawal [Line Items]
Nonderivative financial liabilities undiscounted cash flows by estimated redemption or withdrawal	8,358,024	9,621,305
Deposits due to customers	2,278,756	2,331,993
Borrowings	479,568	420,719
Debentures	2,869,699	4,116,768
Other financial liabilities	₩ 2,730,001	₩ 2,751,825

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Risk Management_Cash flow of derivative financial liabilities by maturities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Cash flow to be paid of total settlement derivatives	₩ 3,217,903	₩ 3,017,198
Within 3 months
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Cash flow to be paid of total settlement derivatives	3,150,149	3,009,977
10 to 12 months
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Cash flow to be paid of total settlement derivatives	381	208
1 to 5 years
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Cash flow to be paid of total settlement derivatives	₩ 67,373	₩ 7,013

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Risk Management_Maturity analysis of Offbalance accounts (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of maturity analysis for off balance sheet item [Abstract]
Guarantees	₩ 12,859,715	₩ 14,761,784
Loan commitments	₩ 80,760,325	₩ 83,795,496

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Risk Management_Capital Ratio (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of objectives policies and processes for managing capital [Abstract]
Minimum common equity tier one ratio	6.25%	5.38%
Minimum tier one ratio	7.75%	6.88%
Minimum total regulatory capital ratio	9.75%	8.88%
Summary of quantitative data about what entity manages as capital	the Group is required to meet the following new minimum requirements: 6.25% and 5.38%, a minimum Tier 1 ratio of 7.75% and 6.88% and a minimum total regulatory capital of 9.75% and 8.88% as of December 31, 2017 and 2016, respectively.	the Group is required to meet the following new minimum requirements: 6.25% and 5.38%, a minimum Tier 1 ratio of 7.75% and 6.88% and a minimum total regulatory capital of 9.75% and 8.88% as of December 31, 2017 and 2016, respectively.
Tier one risk based capital [Abstract]
Tier 1 capital	₩ 16,074,987	₩ 15,714,480
Other Tier 1 capital	3,041,664	3,275,496
Tier 2 capital	3,486,555	3,910,513
Total risk adjusted capital	22,603,206	22,900,489
Risk weighted assets for credit risk	134,767,711	138,018,500
Risk weighted assets for market risk	2,316,938	2,277,809
Risk weighted assets for operational risk	9,677,559	9,431,814
Total risk weighted assets	₩ 146,762,208	₩ 149,728,123
Common Equity Tier 1 ratio	10.95%	10.50%
Tier 1 capital ratio	13.03%	12.68%
Total capital ratio	15.40%	15.29%

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Operating Segments_Segment by types of customers (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Inter segment transaction [Line Items]
Net interest income	₩ 5,220,650	$ 4,890,904	₩ 5,019,544	₩ 4,761,900
Interest income	8,550,687	8,010,611	8,512,312	8,698,235
Interest expense	(3,330,037)	(3,119,707)	(3,492,768)	(3,936,335)
Net non-interest income	1,159,676		699,340	631,303
Non-interest income	14,849,236		14,769,985	11,389,680
Non-interest expense	(13,689,560)		(14,070,645)	(10,758,377)
Other income(expense)	(4,223,584)		(4,144,678)	(4,041,617)
General and administrative expenses	(3,530,801)	(3,307,789)	(3,478,476)	(3,150,387)
Impairment losses due to credit loss and others	(692,783)		(666,202)	(891,230)
Operating income	2,156,742	2,020,518	1,574,206	1,351,586
Non operating income(expense)	(207,236)	(194,146)	(20,817)	100,360
Net income before income tax expense	1,949,506	1,826,372	1,553,389	1,451,946
Income tax expense	(419,418)	(392,927)	(275,856)	(376,554)
Net income	₩ 1,530,088	$ 1,433,445	₩ 1,277,533	₩ 1,075,392
Factors used to identify entitys reportable segments	The Group’s reporting segments comprise the following customers: consumer banking, corporate banking, investment banking, capital market, credit card and headquarters and others. The reportable segments are classified based on the target customers for whom the service is being provided.	The Group’s reporting segments comprise the following customers: consumer banking, corporate banking, investment banking, capital market, credit card and headquarters and others. The reportable segments are classified based on the target customers for whom the service is being provided.	The Group’s reporting segments comprise the following customers: consumer banking, corporate banking, investment banking, capital market, credit card and headquarters and others. The reportable segments are classified based on the target customers for whom the service is being provided.	The Group’s reporting segments comprise the following customers: consumer banking, corporate banking, investment banking, capital market, credit card and headquarters and others. The reportable segments are classified based on the target customers for whom the service is being provided.
Operating segments [Member]
Inter segment transaction [Line Items]
Net interest income	₩ 4,633,716		₩ 4,430,585	₩ 4,156,626
Interest income	8,242,056		8,227,523	8,366,720
Interest expense	(3,608,340)		(3,796,938)	(4,210,094)
Net non-interest income	1,905,666		1,655,035	1,579,240
Non-interest income	15,245,069		15,203,864	11,756,633
Non-interest expense	(13,339,403)		(13,548,829)	(10,177,393)
Other income(expense)	(4,443,080)		(4,453,370)	(4,368,808)
General and administrative expenses	(3,788,625)		(3,730,476)	(3,417,579)
Impairment losses due to credit loss and others	(654,455)		(722,894)	(951,229)
Operating income	2,096,302		1,632,250	1,367,058
Non operating income(expense)	(180,266)		58,358	154,427
Net income before income tax expense	1,916,036		1,690,608	1,521,485
Income tax expense	(412,634)		(277,818)	(333,197)
Net income	1,503,402		1,412,790	1,188,288
Consumer banking
Inter segment transaction [Line Items]
Net interest income	1,702,939		1,484,233	1,289,088
Interest income	3,149,625		2,979,811	2,850,985
Interest expense	(955,836)		(1,023,290)	(1,227,921)
Inter-segment	(490,850)		(472,288)	(333,976)
Net non-interest income	649,950		557,410	554,957
Non-interest income	802,387		923,810	886,057
Non-interest expense	(253,961)		(405,912)	(353,032)
Inter-segment	101,524		39,512	21,932
Other income(expense)	(1,906,561)		(1,875,579)	(1,790,292)
General and administrative expenses	(1,808,974)		(1,788,672)	(1,782,234)
Impairment losses due to credit loss and others	(97,587)		(86,907)	(8,058)
Operating income	446,328		166,064	53,753
Non operating income(expense)	(98,510)		(35,081)	(19,113)
Net income before income tax expense	347,818		130,983	34,640
Income tax expense	(84,172)		(31,698)	(8,383)
Net income	₩ 263,646		₩ 99,285	₩ 26,257
Factors used to identify entitys reportable segments	• Consumer banking: Loans/deposits and financial services for consumers, etc.	• Consumer banking: Loans/deposits and financial services for consumers, etc.	• Consumer banking: Loans/deposits and financial services for consumers, etc.	• Consumer banking: Loans/deposits and financial services for consumers, etc.
Corporate banking
Inter segment transaction [Line Items]
Net interest income	₩ 1,795,377		₩ 1,741,140	₩ 1,699,913
Interest income	2,964,813		3,026,148	3,255,796
Interest expense	(1,681,652)		(1,780,990)	(1,880,195)
Inter-segment	512,216		495,982	324,312
Net non-interest income	571,336		550,194	513,686
Non-interest income	680,778		535,514	503,321
Non-interest expense	(170,268)		(32,873)	(25,993)
Inter-segment	60,826		47,553	36,358
Other income(expense)	(1,149,288)		(1,476,190)	(1,795,561)
General and administrative expenses	(832,429)		(966,878)	(925,566)
Impairment losses due to credit loss and others	(316,859)		(509,312)	(869,995)
Operating income	1,217,425		815,144	418,038
Non operating income(expense)	(3,153)		(1,619)	(2,189)
Net income before income tax expense	1,214,272		813,525	415,849
Income tax expense	(296,634)		(203,983)	(98,886)
Net income	₩ 917,638		₩ 609,542	₩ 316,963
Factors used to identify entitys reportable segments	• Corporate banking: Loans/deposits and export/import, financial services for corporations, etc.	• Corporate banking: Loans/deposits and export/import, financial services for corporations, etc.	• Corporate banking: Loans/deposits and export/import, financial services for corporations, etc.	• Corporate banking: Loans/deposits and export/import, financial services for corporations, etc.
Investment banking
Inter segment transaction [Line Items]
Net interest income	₩ 12,124		₩ 14,613	₩ 5,601
Interest income	148,500		153,160	154,460
Interest expense	(243)		(225)	(18)
Inter-segment	(136,133)		(138,322)	(148,841)
Net non-interest income	152,168		160,885	115,111
Non-interest income	366,523		605,026	489,659
Non-interest expense	(214,355)		(444,141)	(374,548)
Other income(expense)	(63,835)		(110,863)	53,089
General and administrative expenses	(12,881)		(14,983)	(14,933)
Impairment losses due to credit loss and others	(50,954)		(95,880)	68,022
Operating income	100,457		64,635	173,801
Non operating income(expense)	39,350		46,559	43,728
Net income before income tax expense	139,807		111,194	217,529
Income tax expense	(33,834)		(26,909)	(52,642)
Net income	₩ 105,973		₩ 84,285	₩ 164,887
Factors used to identify entitys reportable segments	• Investment banking: Domestic/foreign investment, structured finance, M&A, Equity & fund investment related business, venture advisory related tasks, real estate SOC development practices etc.	• Investment banking: Domestic/foreign investment, structured finance, M&A, Equity & fund investment related business, venture advisory related tasks, real estate SOC development practices etc.	• Investment banking: Domestic/foreign investment, structured finance, M&A, Equity & fund investment related business, venture advisory related tasks, real estate SOC development practices etc.	• Investment banking: Domestic/foreign investment, structured finance, M&A, Equity & fund investment related business, venture advisory related tasks, real estate SOC development practices etc.
Capital market
Inter segment transaction [Line Items]
Net interest income	₩ 36,883		₩ 48,826	₩ 40,913
Interest income	18,834		19,575	19,394
Interest expense			(324)	(81)
Inter-segment	18,049		29,575	21,600
Net non-interest income	69,671		4,033	18,015
Non-interest income	9,548,399		7,590,087	5,760,567
Non-interest expense	(9,478,728)		(7,586,054)	(5,742,552)
Other income(expense)	14,662		(51,995)	(44,187)
General and administrative expenses	(16,567)		(17,964)	(16,945)
Impairment losses due to credit loss and others	31,229		(34,031)	(27,242)
Operating income	121,216		864	14,741
Non operating income(expense)			(5,288)	197
Net income before income tax expense	121,216		(4,424)	14,938
Income tax expense	(29,335)		1,071	(3,615)
Net income	₩ 91,881		₩ (3,353)	₩ 11,323
Factors used to identify entitys reportable segments	• Capital market: Fund management, investment securities and derivatives business, etc.	• Capital market: Fund management, investment securities and derivatives business, etc.	• Capital market: Fund management, investment securities and derivatives business, etc.	• Capital market: Fund management, investment securities and derivatives business, etc.
Credit Card
Inter segment transaction [Line Items]
Net interest income	₩ 463,603		₩ 428,095	₩ 378,019
Interest income	599,550		556,681	500,449
Interest expense	(135,947)		(128,586)	(122,430)
Net non-interest income	73,537		79,713	98,034
Non-interest income	1,163,575		986,147	871,486
Non-interest expense	(1,090,038)		(906,434)	(773,452)
Other income(expense)	(398,652)		(364,137)	(321,265)
General and administrative expenses	(163,536)		(148,001)	(124,362)
Impairment losses due to credit loss and others	(235,116)		(216,136)	(196,903)
Operating income	138,488		143,671	154,788
Non operating income(expense)	(5,219)		(1,504)	(5,150)
Net income before income tax expense	133,269		142,167	149,638
Income tax expense	(32,055)		(32,774)	(32,780)
Net income	₩ 101,214		₩ 109,393	₩ 116,858
Factors used to identify entitys reportable segments	• Credit Card: Credit card, cash service and card loan, etc. and	• Credit Card: Credit card, cash service and card loan, etc. and	• Credit Card: Credit card, cash service and card loan, etc. and	• Credit Card: Credit card, cash service and card loan, etc. and
Headquarter and Others
Inter segment transaction [Line Items]
Net interest income	₩ 622,790		₩ 713,678	₩ 743,092
Interest income	1,360,734		1,492,148	1,585,636
Interest expense	(834,662)		(863,523)	(979,449)
Inter-segment	96,718		85,053	136,905
Net non-interest income	389,004		302,800	279,437
Non-interest income	2,683,407		4,563,280	3,245,543
Non-interest expense	(2,132,053)		(4,173,415)	(2,907,816)
Inter-segment	(162,350)		(87,065)	(58,290)
Other income(expense)	(939,406)		(574,606)	(470,592)
General and administrative expenses	(954,238)		(793,978)	(553,539)
Impairment losses due to credit loss and others	14,832		219,372	82,947
Operating income	72,388		441,872	551,937
Non operating income(expense)	(112,734)		55,291	136,954
Net income before income tax expense	(40,346)		497,163	688,891
Income tax expense	63,396		16,475	(136,891)
Net income	₩ 23,050		₩ 513,638	₩ 552,000
Factors used to identify entitys reportable segments	• Headquarter and others: Segments that do not belong to above operating segments	• Headquarter and others: Segments that do not belong to above operating segments	• Headquarter and others: Segments that do not belong to above operating segments	• Headquarter and others: Segments that do not belong to above operating segments
Inter segment transaction
Inter segment transaction [Line Items]
Net interest income	₩ 586,934		₩ 588,959	₩ 605,274
Interest income	308,631		284,789	331,515
Interest expense	278,303		304,170	273,759
Net non-interest income	(745,990)		(955,695)	(947,937)
Non-interest income	(395,833)		(433,879)	(366,953)
Non-interest expense	(350,157)		(521,816)	(580,984)
Other income(expense)	219,496		308,692	327,191
General and administrative expenses	257,824		252,000	267,192
Impairment losses due to credit loss and others	(38,328)		56,692	59,999
Operating income	60,440		(58,044)	(15,472)
Non operating income(expense)	(26,970)		(79,175)	(54,067)
Net income before income tax expense	33,470		(137,219)	(69,539)
Income tax expense	(6,784)		1,962	(43,357)
Net income	₩ 26,686		₩ (135,257)	₩ (112,896)

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Operating Segments_Information on products and services (Details)	12 Months Ended
	Dec. 31, 2017
Disclosure of products and services [Abstract]
Description of information on products and services	The products of the Group are classified as interest-bearing products such as loans, deposits and debt securities and non-interest bearing products such as loan commitment, credit commitment, equity securities, and credit card service. This classification of products has been reflected in the segment information presenting interest income and non-interest income.

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Operating Segments_Information on geographical areas (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Domestic customers
Disclosure of geographical areas [Line Items]
Revenue	₩ 22,279,666	₩ 22,265,508	₩ 18,974,359
Non-current assets	3,550,764	3,498,327
Foreign customers
Disclosure of geographical areas [Line Items]
Revenue	1,120,257	1,016,788	₩ 1,113,556
Non-current assets	₩ 233,732	₩ 240,946

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Cash And Cash Equivalents Details of Cash and Cash Equivalents (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 KRW (₩)	Dec. 31, 2014 KRW (₩)
Cash and cash equivalents [Abstract]
Cash	₩ 2,009,363		₩ 2,113,739
Foreign currencies	617,155		742,340
Demand deposits	3,423,355		4,238,956
Fixed deposits	858,413		496,289
Total	₩ 6,908,286	$ 6,471,947	₩ 7,591,324	$ 7,111,843	₩ 6,644,055	₩ 5,962,861

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Cash And Cash Equivalents Significant Noncash Transactions (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Cash flow noncash investing and financing activities disclosure [Abstract]
Changes in other comprehensive income (loss) due to valuation of AFS financial assets	₩ (84,498)	$ (79,161)	₩ 12,586	₩ 72,297
Changes in other comprehensive income (loss) of investment in associates	612	574	(7,937)	3,295
Changes in other comprehensive income of foreign operations translation	(208,329)	(195,171)	28,712	33,837
Changes in other comprehensive income related to valuation of cash flow hedging	777	728	10,371
Changes in other comprehensive income due to remeasurement of the net defined benefit liability	10,497	$ 9,834	34,162	₩ (78,267)
Changes in investments in associates due to equity swap and others	51,227
Changes in investments in associates due to accounts transfer	(62,571)		(156,708)
Changes in unpaid dividends of hybrid equity securities	₩ (10,658)		₩ 5,187

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Cash And Cash Equivalents Liability Adjustments from Financing Activities (Details)	12 Months Ended
	Dec. 31, 2017 KRW (₩)
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
January 1,2017	₩ 42,334,964,000,000
Changes in liabilities arising from financing activities [Abstract]
Issuances	27,496,220,000,000
Redemption	(26,313,402,000,000)
Not involving cash inflows and outflows
Foreign Exchange	(828,678,000,000)
Variation of gains on valuation of hedged items	(39,373,000,000)
Others	4,626,000,000
December 31,2017	42,654,357,000,000
Borrowings
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
January 1,2017	18,769,515,000,000
Changes in liabilities arising from financing activities [Abstract]
Issuances	9,057,999,000,000
Redemption	(12,692,882,000,000)
Not involving cash inflows and outflows
Foreign Exchange	(350,429,000,000)
Others	503,000,000
December 31,2017	14,784,706,000,000
Debentures
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
January 1,2017	23,565,449,000,000
Changes in liabilities arising from financing activities [Abstract]
Issuances	18,438,221,000,000
Redemption	(13,620,520,000,000)
Not involving cash inflows and outflows
Foreign Exchange	(478,249,000,000)
Variation of gains on valuation of hedged items	(39,373,000,000)
Others	4,123,000,000
December 31,2017	₩ 27,869,651,000,000

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Financial Assets At Fair Value Through Profit Or Loss_Financial assets held for trading and Financial assets designated at fair value through profit or loss (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading	₩ 5,820,787		₩ 5,633,724
Financial assets designed at FVTPL	22,290		17,000
Financial assets at FVTPL	5,843,077	$ 5,474,019	5,650,724
Financial assets at fair value through profit or loss classified as held for trading category [Member]
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading	5,820,787		5,633,724
Deposits indexed to gold prices
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading	25,972		26,180
Securities
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading	2,679,040		2,709,249
Korean treasury and government agencies
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading	540,438		519,337
Financial institutions
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading	1,476,498		1,444,459
Corporates
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading	627,397		681,120
Equity securities
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading	21,666		35,983
Beneficiary certificates
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading	13,041		23,891
Loaned securities
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading			4,459
Derivatives instruments assets
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets held for trading	3,115,775		2,898,295
Financial assets at fair value through profit or loss designated upon initial recognition category [Member]
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets designed at FVTPL	22,290		17,000
Debt securities
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets designed at FVTPL	9,694		4,348
Equity securities
Disclosure of financial assets at fair value through profit or loss [Line Items]
Financial assets designed at FVTPL	₩ 12,596		₩ 12,652

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Available For Sale Financial Assets_Details of Availableforsale financial assets (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2017 USD ($)
Inter segment transaction [Line Items]
Amortized cost	₩ 14,936,359	₩ 20,307,054
Unrealized gains	459,955	581,672
Unrealized losses	(43,364)	(71,143)
Fair value	15,352,950	20,817,583	$ 14,383,232
Debt securities
Inter segment transaction [Line Items]
Amortized cost	13,086,323	15,976,283
Unrealized gains	9,669	118,189
Unrealized losses	(37,004)	(46,163)
Fair value	13,058,988	16,048,309
Korean treasury and government agencies
Inter segment transaction [Line Items]
Amortized cost	2,338,760	3,778,688
Unrealized gains	1,193	13,700
Unrealized losses	(9,386)	(3,758)
Fair value	2,330,567	3,788,630
Financial institutions
Inter segment transaction [Line Items]
Amortized cost	5,225,921	6,310,517
Unrealized gains	1,504	7,585
Unrealized losses	(10,159)	(3,904)
Fair value	5,217,266	6,314,198
Corporates
Inter segment transaction [Line Items]
Amortized cost	2,727,016	4,336,195
Unrealized gains	3,851	93,957
Unrealized losses	(5,635)	(20,966)
Fair value	2,725,232	4,409,186
Asset-backed securities
Inter segment transaction [Line Items]
Amortized cost	309,518	250,630
Unrealized losses	(1,337)	(1,427)
Fair value	308,181	249,203
Bond denominated in foreign currencies
Inter segment transaction [Line Items]
Amortized cost	2,449,954	1,226,893
Unrealized gains	3,100	1,076
Unrealized losses	(10,475)	(16,105)
Fair value	2,442,579	1,211,864
Other debt securities
Inter segment transaction [Line Items]
Amortized cost	35,154	73,360
Unrealized gains	21	1,871
Unrealized losses	(12)	(3)
Fair value	35,163	75,228
Equity securities
Inter segment transaction [Line Items]
Amortized cost	982,393	1,034,299
Unrealized gains	430,921	420,038
Unrealized losses	(2,236)	(724)
Fair value	1,411,078	1,453,613
Beneficiary certificates
Inter segment transaction [Line Items]
Amortized cost	697,655	2,802,847
Unrealized gains	18,701	40,405
Unrealized losses	(3,728)	(21,170)
Fair value	712,628	2,822,082
Securities loaned
Inter segment transaction [Line Items]
Amortized cost	169,988	493,625
Unrealized gains	664	3,040
Unrealized losses	(396)	(3,086)
Fair value	₩ 170,256	₩ 493,579

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Held To Maturity Financial Assets_Details of held to maturity financial assets (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2017 USD ($)
Schedule of held to maturity securities [Line Items]
Amortized cost	₩ 16,749,296	₩ 13,910,251	$ 15,691,383
Unrealized gains	23,066	93,778
Unrealized losses	(56,683)	(18,852)
Fair value	16,715,679	13,985,177
Korean treasury and government agencies
Schedule of held to maturity securities [Line Items]
Amortized cost	3,994,857	3,754,356
Unrealized gains	6,944	26,366
Unrealized losses	(15,266)	(6,391)
Fair value	3,986,535	3,774,331
Financial institutions
Schedule of held to maturity securities [Line Items]
Amortized cost	7,245,426	5,168,487
Unrealized gains	2,923	9,236
Unrealized losses	(15,067)	(4,940)
Fair value	7,233,282	5,172,783
Corporates
Schedule of held to maturity securities [Line Items]
Amortized cost	5,311,970	4,823,356
Unrealized gains	12,367	58,176
Unrealized losses	(25,326)	(7,093)
Fair value	5,299,011	4,874,439
Bond denominated in foreign currencies
Schedule of held to maturity securities [Line Items]
Amortized cost	197,043	164,052
Unrealized gains	832
Unrealized losses	(1,024)	(428)
Fair value	₩ 196,851	₩ 163,624

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Loans And Receivables Details of loans and receivables (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Disclosure Of Loans And Receivables [Abstract]
Due from banks	₩ 8,868,378		₩ 14,815,476
Loans	251,523,301		235,400,585
Other receivables	6,714,525		8,176,572
Total	₩ 267,106,204	$ 250,235,337	₩ 258,392,633

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Loans And Receivables Details of due from banks (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Cashand cash equivalents [Line Items]
Total	₩ 8,868,378	₩ 14,815,476
Due from banks in local currency
Cashand cash equivalents [Line Items]
Total	6,422,473	11,477,086
Due from banks in local currency | Allowance for credit losses
Cashand cash equivalents [Line Items]
Total	(1,541)	(2,798)
Due from banks in local currency | Due from the Bank of Korea | Gross carrying amount [Member]
Cashand cash equivalents [Line Items]
Total	6,246,496	11,395,162
Due from banks in local currency | Due from the depository banks | Gross carrying amount [Member]
Cashand cash equivalents [Line Items]
Total	30,003	3
Due from banks in local currency | Due from non-monetary financial institutions | Gross carrying amount [Member]
Cashand cash equivalents [Line Items]
Total	150	9,811
Due from banks in local currency | Due from the Korea Exchange | Gross carrying amount [Member]
Cashand cash equivalents [Line Items]
Total	50,000	1,625
Due from banks in local currency | Others | Gross carrying amount [Member]
Cashand cash equivalents [Line Items]
Total	97,365	73,283
Due from banks in foreign currencies
Cashand cash equivalents [Line Items]
Total	2,445,905	3,338,390
Due from banks in foreign currencies | Allowance for credit losses
Cashand cash equivalents [Line Items]
Total	(917)	(2,295)
Due from banks in foreign currencies | Due from banks on demand | Gross carrying amount [Member]
Cashand cash equivalents [Line Items]
Total	794,353	877,636
Due from banks in foreign currencies | Due from banks on time | Gross carrying amount [Member]
Cashand cash equivalents [Line Items]
Total	972,915	1,684,631
Due from banks in foreign currencies | Others | Gross carrying amount [Member]
Cashand cash equivalents [Line Items]
Total	₩ 679,554	₩ 778,418

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Loans And Receivables Details of restricted due from banks (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Restricted due from financial institutions [Line Items]
Total	₩ 7,495,518	₩ 13,098,496
Due from banks in local currency
Restricted due from financial institutions [Line Items]
Total	6,340,890	11,465,466
Due from banks in local currency | Due from the Bank of Korea
Restricted due from financial institutions [Line Items]
Total	₩ 6,246,496	₩ 11,395,162
Reason of restriction	Reserve deposits under BOK Act	Reserve deposits under BOK Act
Counterparty	The Bank of Korea	The Bank of Korea
Due from banks in local currency | Others
Restricted due from financial institutions [Line Items]
Total	₩ 94,394	₩ 70,304
Reason of restriction	Central counter party KRW margin and others	Reserve deposits of the futures, option and others
Counterparty	the Korea Exchange and others	Samsung Investment & Securities Co., Ltd. and others
Due from banks in foreign currencies
Restricted due from financial institutions [Line Items]
Total	₩ 1,154,628	₩ 1,633,030
Due from banks in foreign currencies | Others
Restricted due from financial institutions [Line Items]
Total	₩ 367,108	₩ 778,418
Reason of restriction	Reserve deposits and others	Reserve deposits and others
Counterparty	The People’s Bank of China and others	The People’s Bank of China and others
Due from banks in foreign currencies | Due from banks on demand
Restricted due from financial institutions [Line Items]
Total	₩ 787,520	₩ 854,612
Reason of restriction	Reserve deposits under The BOK Act and others	Reserve deposits under The BOK Act and others
Counterparty	The Bank of Korea and others	The Bank of Korea and others

XML

Loans And Receivables Details of Loans (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of loans other than banks [Line Items]
Total	₩ 251,523,301	₩ 235,400,585
Present value discount
Disclosure of loans other than banks [Line Items]
Total	(10,988)	(13,827)
Allowance for credit losses
Disclosure of loans other than banks [Line Items]
Total	(1,770,222)	(1,850,888)
Loans in local currency | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	200,213,230	191,309,481
Loans in foreign currencies | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	13,147,888	14,101,839
Domestic banker’s letter of credit | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	2,516,907	3,754,030
Credit card accounts | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	6,827,295	6,673,765
Bills bought in foreign currencies | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	8,197,159	7,758,575
Bills bought in local currency | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	334,714	414,451
Factoring receivables | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	137,523	96,763
Advances for customers on guarantees | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	23,620	25,197
Privately placed bonds | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	362,319	328,405
Securitized loans | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	563,152	252,690
Call loans | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	3,003,455	2,985,077
Bonds purchased under resale agreements | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	16,859,064	8,854,753
Loan origination costs and fees | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	510,860	458,639
Others | Gross carrying amount [Member]
Disclosure of loans other than banks [Line Items]
Total	₩ 607,325	₩ 251,635

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Loans And Receivables Details of Other Receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of other financial assets [Line Items]
Other receivables	₩ 6,714,525	₩ 8,176,572
Allowance for credit losses
Disclosure of other financial assets [Line Items]
Other receivables	(57,563)	(171,115)
CMA accounts | Gross carrying amount [Member]
Disclosure of other financial assets [Line Items]
Other receivables	135,000	190,000
Receivables | Gross carrying amount [Member]
Disclosure of other financial assets [Line Items]
Other receivables	4,459,318	5,417,676
Accrued income | Gross carrying amount [Member]
Disclosure of other financial assets [Line Items]
Other receivables	1,026,273	1,080,489
Telex and telephone subscription rights and refundable deposits | Gross carrying amount [Member]
Disclosure of other financial assets [Line Items]
Other receivables	984,620	1,019,577
Other debtors | Gross carrying amount [Member]
Disclosure of other financial assets [Line Items]
Other receivables	₩ 166,877	₩ 639,945

XML

Loans And Receivables Changes in allowance for probable credit losses on loans and receivables (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	₩ (2,027,096)	₩ (2,478,057)	₩ (2,953,906)
Changes in allowance account for credit losses of financial assets [Abstract]
Net provision	(862,273)	(890,763)	(1,112,139)
Recoveries of written-off loans	(180,907)	(309,488)	(261,515)
Charge-off	887,169	1,357,201	1,578,312
Sales of loans and receivables	95,229	207,032	141,439
Unwinding effect	45,191	77,220	112,368
Others	212,445	9,759	17,384
Ending balance	(1,830,242)	(2,027,096)	(2,478,057)
Consumers
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	(163,858)	(203,433)	(326,435)
Changes in allowance account for credit losses of financial assets [Abstract]
Net provision	(131,275)	(73,356)	(103,166)
Recoveries of written-off loans	(45,060)	(53,679)	(29,219)
Charge-off	142,099	155,424	240,541
Sales of loans and receivables	898	2,055	2,518
Unwinding effect	8,643	10,319	12,514
Others	908	(1,188)	(186)
Ending balance	(187,645)	(163,858)	(203,433)
Corporates
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	(1,498,842)	(1,686,194)	(2,128,090)
Changes in allowance account for credit losses of financial assets [Abstract]
Net provision	(539,222)	(536,359)	(744,416)
Recoveries of written-off loans	(84,413)	(192,183)	(198,089)
Charge-off	453,249	722,359	1,139,102
Sales of loans and receivables	65,145	113,177	138,055
Unwinding effect	36,548	66,901	99,854
Others	211,729	13,457	7,390
Ending balance	(1,355,806)	(1,498,842)	(1,686,194)
Credit card
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	(155,372)	(145,810)	(129,117)
Changes in allowance account for credit losses of financial assets [Abstract]
Net provision	(203,968)	(207,730)	(180,563)
Recoveries of written-off loans	(51,366)	(44,393)	(34,207)
Charge-off	228,640	242,561	198,077
Others	1
Ending balance	(182,065)	(155,372)	(145,810)
Others
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	(209,024)	(442,620)	(370,264)
Changes in allowance account for credit losses of financial assets [Abstract]
Net provision	12,192	(73,318)	(83,994)
Recoveries of written-off loans	(68)	(19,233)
Charge-off	63,181	236,857	592
Sales of loans and receivables	29,186	91,800	866
Others	(193)	(2,510)	10,180
Ending balance	₩ (104,726)	₩ (209,024)	₩ (442,620)

XML

Fair Value Of Financial Assets And Liabilities Fair value hierarchy of financial assets and liabilities measured at fair value (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 KRW (₩)
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		₩ 5,820,787,000,000	₩ 5,633,724,000,000
Financial assets designed at FVTPL		22,290,000,000	17,000,000,000
Financial assets at fair value through profit or loss		5,843,077,000,000	5,650,724,000,000	$ 5,474,019
Available-for-sale financial assets		15,352,950,000,000	20,817,583,000,000	14,383,232
Derivative financial assets		59,272,000,000	140,577,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		3,176,113,000,000	3,036,478,000,000
Financial liabilities designated at FVTPL		251,796,000,000	766,880,000,000		₩ 854,862,000,000
Financial liabilities at fair value through profit or loss		3,427,909,000,000	3,803,358,000,000	$ 3,211,397
Derivative financial liabilities		₩ 67,754,000,000	₩ 7,221,000,000
Description of valuation processes used in fair value measurement assets		Financial instruments are measured at fair value using a quoted market price in active markets. If there is no active market for a financial instrument, the Group determines the fair value using alternative assumptions and developing fair value measurement methods	Financial instruments are measured at fair value using a quoted market price in active markets. If there is no active market for a financial instrument, the Group determines the fair value using alternative assumptions and developing fair value measurement methods
Description of valuation processes used in fair value measurement liabilities		Financial instruments are measured at fair value using a quoted market price in active markets. If there is no active market for a financial instrument, the Group determines the fair value using alternative assumptions and developing fair value measurement methods	Financial instruments are measured at fair value using a quoted market price in active markets. If there is no active market for a financial instrument, the Group determines the fair value using alternative assumptions and developing fair value measurement methods
Financial assets
Financial assets at fair value through profit or loss [Abstract]
Total		₩ 21,255,298,000,000	₩ 26,608,884,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Carrying amount from disposal of financial assets measured at cost		1,266,000,000
Gains and losses from disposal of financial assets measured at cost		657,000,000
Financial assets | Level 1
Financial assets at fair value through profit or loss [Abstract]
Total		3,633,765,000,000	3,549,365,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Financial assets | Level 2
Financial assets at fair value through profit or loss [Abstract]
Total		15,921,991,000,000	21,463,821,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Financial assets | Level 3
Financial assets at fair value through profit or loss [Abstract]
Total		1,699,542,000,000	1,595,698,000,000
Financial assets held for trading
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		5,820,787,000,000	5,633,724,000,000
Financial assets held for trading | Level 1
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		454,601,000,000	440,491,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Financial assets held for trading | Level 2
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		5,344,704,000,000	5,170,080,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Financial assets held for trading | Level 3
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		21,482,000,000	23,153,000,000
Deposits
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		25,972,000,000	26,180,000,000
Deposits | Level 1
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		25,972,000,000	26,180,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Debt securities
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		₩ 2,644,333,000,000	₩ 2,644,916,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Fair value measurement methods		The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.
Alternative assumptions		Risk-free market rate, credit spread	Risk-free market rate, credit spread
Debt securities | Level 1
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		₩ 405,942,000,000	₩ 370,636,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Debt securities | Level 2
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		2,238,391,000,000	2,274,280,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Equity securities
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		₩ 21,666,000,000	₩ 35,983,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Fair value measurement methods		Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.	Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.
Alternative assumptions		Risk-free market rate, market risk premium, Beta, etc.	Risk-free market rate, market risk premium, Beta, etc.
Equity securities | Level 1
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		₩ 21,666,000,000	₩ 35,983,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Beneficiary certificates
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		₩ 13,041,000,000	₩ 23,891,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Fair value measurement methods		Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.	Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.
Alternative assumptions		Risk-free market rate, market risk premium, Beta, etc.	Risk-free market rate, market risk premium, Beta, etc.
Beneficiary certificates | Level 2
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		₩ 13,041,000,000	₩ 23,891,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Loaned securities
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading			4,459,000,000
Loaned securities | Level 1
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading			4,459,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]		0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]		0
Derivative assets
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		₩ 3,115,775,000,000	₩ 2,898,295,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Fair value measurement methods		The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.	The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.
Alternative assumptions		Risk-free market rate, forward rate, volatility, foreign exchange rate, stock prices, etc.	Risk-free market rate, Forward Rate, Volatility, Foreign Exchange Rate, Stock Prices, etc.
Derivative assets | Level 1
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		₩ 1,021,000,000	₩ 3,233,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Derivative assets | Level 2
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		3,093,272,000,000	2,871,909,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Derivative assets | Level 3
Financial assets at fair value through profit or loss [Abstract]
Financial assets held for trading		21,482,000,000	23,153,000,000
Financial assets designated at FVTPL
Financial assets at fair value through profit or loss [Abstract]
Financial assets designed at FVTPL		22,290,000,000	17,000,000,000
Financial assets designated at FVTPL | Level 3
Financial assets at fair value through profit or loss [Abstract]
Financial assets designed at FVTPL		22,290,000,000	17,000,000,000
Debt securities
Financial assets at fair value through profit or loss [Abstract]
Financial assets designed at FVTPL		₩ 9,694,000,000	₩ 4,348,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Fair value measurement methods		The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.
Alternative assumptions		Risk-free market rate, credit spread	Risk-free market rate, credit spread
Debt securities | Level 3
Financial assets at fair value through profit or loss [Abstract]
Financial assets designed at FVTPL		₩ 9,694,000,000	₩ 4,348,000,000
Equity securities
Financial assets at fair value through profit or loss [Abstract]
Financial assets designed at FVTPL		₩ 12,596,000,000	₩ 12,652,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Fair value measurement methods		Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.	Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.
Alternative assumptions		Risk-free market rate, market risk premium, Beta, etc.	Risk-free market rate, market risk premium, Beta, etc.
Equity securities | Level 3
Financial assets at fair value through profit or loss [Abstract]
Financial assets designed at FVTPL		₩ 12,596,000,000	₩ 12,652,000,000
AFS financial assets
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		15,352,949,000,000	20,817,583,000,000
AFS financial assets | Level 1
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		3,179,164,000,000	3,108,874,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
AFS financial assets | Level 2
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		10,518,015,000,000	16,153,263,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
AFS financial assets | Level 3
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets	[2]	₩ 1,655,770,000,000	₩ 1,555,446,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Description of financial instruments measured at cost		These unquoted equity instruments mostly represent minority investments in special purpose entity vehicles such as asset securitization structures They are measured at cost because observable inputs of financial information to measure fair value was not available to obtain or there is a significant variance in likely estimated cash flows or the probabilities for the various estimated cash flows could not be measured reliably In addition there were no indicators of impairments in these investments and the Group has no intention to dispose these investments in the foreseeable future	These unquoted equity instruments mostly represent minority investments in special purpose entity vehicles such as asset securitization structures. They are measured at cost because (a) observable inputs of financial information to measure fair value was not available to obtain, or (b) there is a significant variance in likely estimated cash flows or (c) the probabilities for the various estimated cash flows could not be measured reliably. In addition, there were no indicators of impairments in these investments and the Group has no intention to dispose these investments in the foreseeable future.
Equity securities of financial assets available-for-sale measured at cost		₩ 37,092,000,000	₩ 43,202,000,000
Debt securities
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		₩ 13,058,987,000,000	₩ 16,048,309,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Fair value measurement methods		The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.
Alternative assumptions		Risk-free market rate, credit spread	Risk-free market rate, credit spread
Debt securities | Level 1
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		₩ 2,710,172,000,000	₩ 2,288,917,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Debt securities | Level 2
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		10,348,815,000,000	13,759,392,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Equity securities
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		₩ 1,411,078,000,000	₩ 1,453,613,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Fair value measurement methods		Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.	Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.
Alternative assumptions		Risk-free market rate, market risk premium, Beta, etc.	Risk-free market rate, market risk premium, Beta, etc.
Equity securities | Level 1
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		₩ 399,214,000,000	₩ 428,678,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Equity securities | Level 3
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets	[2]	1,011,864,000,000	1,024,935,000,000
Beneficiary certificates
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		₩ 712,628,000,000	₩ 2,822,082,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Fair value measurement methods		Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.	Among DCF (Discounted Cash Flow) Model, FCFE (Free Cash Flow to Equity) Model, Comparable Company Analysis, Dividend Discount Model, Risk-adjusted Rate of Return Method, and Net Asset Value Method, more than one method is used given the characteristic of the subject of fair value measurement.
Alternative assumptions		Risk-free market rate, market risk premium, Beta, etc.	Risk-free market rate, market risk premium, Beta, etc.
Beneficiary certificates | Level 2
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		₩ 68,722,000,000	₩ 2,291,571,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Beneficiary certificates | Level 3
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets	[2]	643,906,000,000	530,511,000,000
Securities loaned
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		170,256,000,000	493,579,000,000
Securities loaned | Level 1
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		69,778,000,000	391,279,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Securities loaned | Level 2
Financial assets at fair value through profit or loss [Abstract]
Available-for-sale financial assets		100,478,000,000	102,300,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Derivative assets
Financial assets at fair value through profit or loss [Abstract]
Derivative financial assets		₩ 59,272,000,000	₩ 140,577,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Fair value measurement methods		The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.	The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.
Alternative assumptions		Risk-free market rate, Forward Rate, Volatility, Foreign Exchange Rate, Stock Prices, etc.	Risk-free market rate, Forward Rate, Volatility, Foreign Exchange Rate, Stock Prices, etc.
Derivative assets | Level 2
Financial assets at fair value through profit or loss [Abstract]
Derivative financial assets		₩ 59,272,000,000	₩ 140,478,000,000
Financial liabilities at fair value through profit or loss [Abstract]
Transfers out of level1 into level2 of fair value hierarchy assets	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy assets	[1]	0	0
Derivative assets | Level 3
Financial assets at fair value through profit or loss [Abstract]
Derivative financial assets			99,000,000
Financial liabilities
Financial liabilities at fair value through profit or loss [Abstract]
Total		3,495,663,000,000	3,810,579,000,000
Financial liabilities | Level 1
Financial liabilities at fair value through profit or loss [Abstract]
Total		28,577,000,000	28,251,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	0	0
Financial liabilities | Level 2
Financial liabilities at fair value through profit or loss [Abstract]
Total		3,286,078,000,000	3,075,095,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	0	0
Financial liabilities | Level 3
Financial liabilities at fair value through profit or loss [Abstract]
Total		181,008,000,000	707,233,000,000
Financial liabilities held for trading
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		3,176,113,000,000	3,036,478,000,000
Financial liabilities held for trading | Level 1
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		28,577,000,000	28,251,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	0	0
Financial liabilities held for trading | Level 2
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		3,126,585,000,000	2,974,703,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	0	0
Financial liabilities held for trading | Level 3
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		20,951,000,000	33,524,000,000
Deposits
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		25,964,000,000	26,501,000,000
Deposits | Level 1
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		25,964,000,000	26,501,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	0	0
Derivative liabilities
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		₩ 3,150,149,000,000	₩ 3,009,977,000,000
Fair value measurement methods		The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.	The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.
Alternative assumptions		Risk-free market rate, Forward Rate, Volatility, Foreign Exchange Rate, Stock Prices, etc.	Risk-free market rate, Forward Rate, Volatility, Foreign Exchange Rate, Stock Prices, etc.
Derivative liabilities | Level 1
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		₩ 2,613,000,000	₩ 1,750,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	0	0
Derivative liabilities | Level 2
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		3,126,585,000,000	2,974,703,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	0	0
Derivative liabilities | Level 3
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities held for trading		20,951,000,000	33,524,000,000
Financial liabilities designated at FVTPL
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities designated at FVTPL		251,796,000,000	766,880,000,000
Financial liabilities designated at FVTPL | Level 2
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities designated at FVTPL		91,739,000,000	93,171,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	0	0
Financial liabilities designated at FVTPL | Level 3
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities designated at FVTPL		160,057,000,000	673,709,000,000
Equity-linked securities
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities designated at FVTPL		₩ 160,057,000,000	₩ 673,906,000,000
Fair value measurement methods		The fair value of security linked to stock prices or derivatives is measured by the models such as DCF model, FDM, or Monte Carlo Simulation given the natures of the securities or underlying assets.	The fair value of security linked to stock prices or derivatives is measured by the models such as DCF model, FDM, or Monte Carlo Simulation given the natures of the securities or underlying assets.
Alternative assumptions		Values of underlying assets, Risk-free market rate, Market rate, Dividend and convenience yield, Correlation, Volatility, Credit spread, and Foreign Exchange rate	Values of underlying assets, Risk-free market rate, Market rate, Dividend and convenience yield, Correlation, Volatility, Credit spread, and Foreign Exchange rate
Equity-linked securities | Level 2
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities designated at FVTPL			₩ 197,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	₩ 0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	0	0
Equity-linked securities | Level 3
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities designated at FVTPL		160,057,000,000	673,709,000,000
Debentures
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities designated at FVTPL		₩ 91,739,000,000	₩ 92,974,000,000
Fair value measurement methods		The fair value is measured by discounting the projected cash flows of a debenture by applying the market discount rate that is reflecting credit rating of the Group.	The fair value is measured by discounting the projected cash flows of a debenture by applying the market discount rate that is reflecting credit rating of the Group.
Alternative assumptions		Risk-free market rate, Forward rate	Risk-free market rate, Forward rate
Debentures | Level 2
Financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities designated at FVTPL		₩ 91,739,000,000	₩ 92,974,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	0	0
Derivative Liabilities
Financial liabilities at fair value through profit or loss [Abstract]
Derivative financial liabilities		₩ 67,754,000,000	₩ 7,221,000,000
Fair value measurement methods		The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.	The in-house developed model which is based on the models that are used by market participants in the valuation of general OTC derivative products, such as options, interest rate swaps, currency swap and currency forward that are based on inputs observable in the market. However, for some complicated financial instruments of which valuation should be based on some assumptions since some significant or all inputs to be used in the model are not observable in the market, the in-house derived model which is developed from the general valuation models, such as Finite Difference Method (“FDM”) or Monte Carlo Simulation.
Alternative assumptions		Risk-free market rate, Forward Rate, Volatility, Foreign Exchange Rate, Stock Prices, etc.	Risk-free market rate, Forward Rate, Volatility, Foreign Exchange Rate, Stock Prices, etc.
Derivative Liabilities | Level 2
Financial liabilities at fair value through profit or loss [Abstract]
Derivative financial liabilities		₩ 67,754,000,000	₩ 7,221,000,000
Transfers out of level1 into level2 of fair value hierarchy liabilities	[1]	0	0
Transfers out of level2 into level1 of fair value hierarchy liabilities	[1]	₩ 0	₩ 0

[1] There was no transfers between level 1 and level 2 of financial assets and liabilities measured at fair value. The Group recognizes transfers between levels at the end of reporting period in which events have occurred or conditions have changed.

[2] Certain AFS financial assets were measured at cost as of December 31, 2016 and 2017, that are amounting to 43,202 million Won and 37,092 million Won, respectively. These unquoted equity instruments mostly represent minority investments in special purpose entity vehicles such as asset securitization structures. They are measured at cost because (a) observable inputs of financial information to measure fair value was not available to obtain, or (b) there is a significant variance in likely estimated cash flows or (c) the probabilities for the various estimated cash flows could not be measured reliably. In addition, there were no indicators of impairments in these investments and the Group has no intention to dispose these investments in the foreseeable future.

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Fair Value Of Financial Assets And Liabilities financial assets and liabilities classified into level three (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Gains losses from financial assets and liabilities classified as level3 that the group holds as at the end of the year		₩ (34,621)		₩ (94,238)		₩ (2,854)
Changes in unobservable inputs financial assets liabilities recognition in other comprehensive income [Abstract]
Unfavorable changes in unobservable inputs in other comprehensive income		The sensitivity analysis of the financial instruments has been performed by classifying with favorable and unfavorable changes based on how changes in unobservable assumptions would have effects on the fluctuations of financial instruments’ value When the fair value of a financial instrument is affected by more than one unobservable assumption the below table reflects the most favorable or the most unfavorable changes which resulted from varying the assumptions individually The sensitivity analysis was performed for two types of level 3 financial instruments interest rate related derivatives currency related derivatives equity related derivatives and equity linked securities of which fair value changes are recognized as net income; equity securities and beneficiary certificates of which fair value changes are recognized as other comprehensive income Equity securities classified as level 3 but measured at costs are excluded from sensitivity analysis		The sensitivity analysis of the financial instruments has been performed by classifying with favorable and unfavorable changes based on how changes in unobservable assumptions would have effects on the fluctuations of financial instruments’ value When the fair value of a financial instrument is affected by more than one unobservable assumption the below table reflects the most favorable or the most unfavorable changes which resulted from varying the assumptions individually The sensitivity analysis was performed for two types of level 3 financial instruments interest rate related derivatives currency related derivatives equity related derivatives and equity linked securities of which fair value changes are recognized as net income; equity securities and beneficiary certificates of which fair value changes are recognized as other comprehensive income Equity securities classified as level 3 but measured at costs are excluded from sensitivity analysis		The sensitivity analysis of the financial instruments has been performed by classifying with favorable and unfavorable changes based on how changes in unobservable assumptions would have effects on the fluctuations of financial instruments’ value When the fair value of a financial instrument is affected by more than one unobservable assumption the below table reflects the most favorable or the most unfavorable changes which resulted from varying the assumptions individually The sensitivity analysis was performed for two types of level 3 financial instruments interest rate related derivatives currency related derivatives equity related derivatives and equity linked securities of which fair value changes are recognized as net income; equity securities and beneficiary certificates of which fair value changes are recognized as other comprehensive income Equity securities classified as level 3 but measured at costs are excluded from sensitivity analysis
Financial assets
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 1,595,698		₩ 1,472,990		₩ 1,479,706
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)		51,179		(31,618)		19,574
Other comprehensive income(loss)		20,121		62,474		81,814
Purchases Issuances		299,334		397,922		220,377
Disposals Settlements		(266,790)		(286,359)		(235,123)
Transfer to or from level 3	[1]			(19,711)		(93,358)
Ending balance		1,699,542		1,595,698		1,472,990
Changes in unobservable inputs financial assets liabilities recognition in profit or loss [Abstract]
Favorable changes in unobservable inputs in net income(loss)		2,169		1,568		11,467
Unfavorable changes in unobservable inputs in net income(loss)		(1,459)		(2,905)		(10,468)
Changes in unobservable inputs financial assets liabilities recognition in other comprehensive income [Abstract]
Favorable changes in unobservable inputs in other comprehensive income(loss)		30,444		34,315		41,830
Unfavorable changes in unobservable inputs in other comprehensive income(loss)		₩ (17,103)		₩ (21,122)		₩ (24,824)
Derivative assets
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Fair value measurement technique		Option valuation model and others		Option valuation model and others		Option valuation model and others
Input variable		Correlation coefficient Volatility of underlying asset		Correlation coefficient Volatility of underlying asset		Correlation coefficient Volatility of underlying asset
Impact of changes in significant unobservable inputs on fair value measurement		Variation of fair value increases as correlation coefficient increases. Variation of fair value increases as volatility increases.		Variation of fair value increases as correlation coefficient increases. Variation of fair value increases as volatility increases.		Variation of fair value increases as correlation coefficient increases. Variation of fair value increases as volatility increases.
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 23,153		₩ 78,676		₩ 49,274
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)		22,362		(29,117)		71,703
Purchases Issuances		1,398		13,640		(8,166)
Disposals Settlements		(25,431)		(39,506)		(33,156)
Transfer to or from level 3	[1]			(540)	[2]	(979)	[3]
Ending balance		21,482		₩ 23,153		₩ 78,676
Description of reasons for transfers out of level3 of fair value hierarchy assets				As the variables used for the valuation of currency related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.		As the variables used for the valuation of interest rate and equity related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.
Changes in unobservable inputs financial assets liabilities recognition in profit or loss [Abstract]
Favorable changes in unobservable inputs in net income(loss)	[4],[5]	1,234		₩ 861		₩ 10,674
Unfavorable changes in unobservable inputs in net income(loss)	[4],[5]	₩ (526)		₩ (2,248)		₩ (9,729)
Derivative assets | Bottom of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		12.10%		12.10%		12.10%
Range		90.00%		90.00%		90.00%
Derivative assets | Top of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		28.10%		28.10%		28.10%
Range		98.00%		98.00%		98.00%
Financial assets designated at FVTPL
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 17,000		₩ 12,595		₩ 16,633
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)		290	[6]	882	[6]	1,028
Purchases Issuances		5,000		4,509		1,000
Disposals Settlements				(986)		(6,066)
Ending balance		22,290		17,000		₩ 12,595
Equity-linked securities
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Fair value measurement technique						Monte Carlo Simulation and others
Input variable						Correlation coefficient Volatility of underlying asset
Impact of changes in significant unobservable inputs on fair value measurement						Equity linked securities’ variation of fair value increases if both volatility and correlation coefficient increase. However when correlation coefficient decreases, despite the increase in volatility, the variation of fair value of equity linked securities may decrease.
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance						₩ 6,066
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Disposals Settlements						₩ (6,066)
Equity-linked securities | Bottom of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range						6.80%
Range						36.30%
Equity-linked securities | Top of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range						58.90%
Range						69.40%
Debt securities
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		4,348		986
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)	[6]	346		(161)		₩ (14)
Purchases Issuances		5,000		4,509		1,000
Disposals Settlements				(986)
Ending balance		9,694		4,348		₩ 986
Changes in unobservable inputs financial assets liabilities recognition in profit or loss [Abstract]
Favorable changes in unobservable inputs in net income(loss)	[7]	265		19
Unfavorable changes in unobservable inputs in net income(loss)	[7]	₩ (309)		₩ (18)
Equity securities
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Fair value measurement technique		External appraisal value and others		External appraisal value and others		External appraisal value and others
Input variable		Expected growth rate Volatility of real estate sale price Discount rate of lease cash flow and others		Expected growth rate Volatility of real estate sale price Discount rate of lease cash flow and others		Expected growth rate Volatility of real estate sale price Discount rate of lease cash flow and others
Impact of changes in significant unobservable inputs on fair value measurement		Fair value increases as expected growth rate increases. Fair value increases as sale price Increases Fair value increases as discount rate of lease cash flow decreases		Fair value increases as expected growth rate increases. Fair value increases as sale price Increases Fair value increases as discount rate of lease cash flow decreases		Fair value increases as expected growth rate increases. Fair value increases as sale price Increases Fair value increases as discount rate of lease cash flow decreases
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 12,652		₩ 11,609		₩ 10,567
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)	[6]	(56)		1,043		1,042
Ending balance		12,596		12,652		11,609
Changes in unobservable inputs financial assets liabilities recognition in profit or loss [Abstract]
Favorable changes in unobservable inputs in net income(loss)	[7]	670		688		793
Unfavorable changes in unobservable inputs in net income(loss)	[7]	₩ (624)		₩ (639)		₩ (739)
Equity securities | Bottom of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		0.00%		0.00%		0.00%
Range		8.31%		8.31%		8.31%
Equity securities | Top of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		1.00%		1.00%		1.00%
Range		0.00%		0.00%		0.00%
Range		8.54%		8.54%		8.54%
AFS financial assets
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 1,555,446		₩ 1,375,746		₩ 1,401,853
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)	[6]	28,198		(7,260)		(60,532)
Other comprehensive income(loss)		20,121		62,474		81,814
Purchases Issuances		292,936		379,773		227,543
Disposals Settlements		(240,931)		(236,116)		(182,553)
Transfer to or from level 3	[1],[8]			(19,171)		(92,379)
Ending balance		₩ 1,655,770		₩ 1,555,446		₩ 1,375,746
Equity securities
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Fair value measurement technique		External appraisal value and others		External appraisal value and others		External appraisal value and others
Input variable		Expected growth rate Volatility of real estate sale price Discount rate of lease cash flow and others		Expected growth rate Volatility of real estate sale price Discount rate of lease cash flow and others		Expected growth rate Volatility of real estate sale price Discount rate of lease cash flow and others
Impact of changes in significant unobservable inputs on fair value measurement		Fair value increases as expected growth rate increases. Fair value increases as sale price Increases Fair value increases as discount rate of lease cash flow decreases		Fair value increases as expected growth rate increases. Fair value increases as sale price Increases Fair value increases as discount rate of lease cash flow decreases		Fair value increases as expected growth rate increases. Fair value increases as sale price Increases Fair value increases as discount rate of lease cash flow decreases
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 1,024,935		₩ 993,368		₩ 1,031,918
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)	[6]	27,986		(6,986)		(57,373)
Other comprehensive income(loss)		24,442		57,323		105,290
Purchases Issuances		65,961		205,749		105,930
Disposals Settlements		(131,460)		(205,348)		(100,018)
Transfer to or from level 3	[1],[8]			(19,171)		(92,379)
Ending balance		1,011,864		₩ 1,024,935		₩ 993,368
Description of reasons for transfers into level3 of fair value hierarchy assets				AFS financial assets were transferred out of level 1 to level 3 upon the change of the fair value measurement method of the assets by using market the external valuation specialists from previously using quoted prices in the active market, in the opposite case, they were transferred out of level 3 to level 1.		AFS financial assets were transferred out of level 1 to level 3 upon the change of the fair value measurement method of the assets by using market the external valuation specialists from previously using quoted prices in the active market, in the opposite case, they were transferred out of level 3 to level 1.
Description of reasons for transfers out of level3 of fair value hierarchy assets				AFS financial assets were transferred out of level 1 to level 3 upon the change of the fair value measurement method of the assets by using market the external valuation specialists from previously using quoted prices in the active market, in the opposite case, they were transferred out of level 3 to level 1.		AFS financial assets were transferred out of level 1 to level 3 upon the change of the fair value measurement method of the assets by using market the external valuation specialists from previously using quoted prices in the active market, in the opposite case, they were transferred out of level 3 to level 1.
Changes in unobservable inputs financial assets liabilities recognition in other comprehensive income [Abstract]
Favorable changes in unobservable inputs in other comprehensive income(loss)	[9],[10]	28,583		₩ 31,412		₩ 37,648
Unfavorable changes in unobservable inputs in other comprehensive income(loss)	[9],[10]	₩ (15,246)		₩ (18,551)		₩ (20,869)
Equity securities | Bottom of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		0.00%		0.00%		0.00%
Range		8.31%		8.31%		8.31%
Equity securities | Top of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		1.00%		1.00%		1.00%
Range		0.00%		0.00%		0.00%
Range		8.54%		8.54%		8.54%
Beneficiary certificates
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Fair value measurement technique		External appraisal value and others		External appraisal value and others		External appraisal value and others
Input variable		Expected growth rate Volatility of real estate sale price Discount rate of lease cash flow and others		Expected growth rate Volatility of real estate sale price Discount rate of lease cash flow and others		Expected growth rate Volatility of real estate sale price Discount rate of lease cash flow and others
Impact of changes in significant unobservable inputs on fair value measurement		Fair value increases as expected growth rate increases. Fair value increases as sale price Increases Fair value increases as discount rate of lease cash flow decreases		Fair value increases as expected growth rate increases. Fair value increases as sale price Increases Fair value increases as discount rate of lease cash flow decreases		Fair value increases as expected growth rate increases. Fair value increases as sale price Increases Fair value increases as discount rate of lease cash flow decreases
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 530,511		₩ 377,070		₩ 355,694
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)	[6]	212		(868)		3,905
Other comprehensive income(loss)		(4,321)		5,794		(24,846)
Purchases Issuances		226,975		174,024		121,613
Disposals Settlements		(109,471)		(25,509)		(79,296)
Ending balance		643,906		530,511		377,070
Changes in unobservable inputs financial assets liabilities recognition in other comprehensive income [Abstract]
Favorable changes in unobservable inputs in other comprehensive income(loss)		1,861		2,903		4,102
Unfavorable changes in unobservable inputs in other comprehensive income(loss)		₩ (1,857)		₩ (2,571)		₩ (3,875)
Beneficiary certificates | Bottom of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		0.00%		0.00%		0.00%
Range		8.31%		8.31%		8.31%
Beneficiary certificates | Top of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		1.00%		1.00%		1.00%
Range		0.00%		0.00%		0.00%
Range		8.54%		8.54%		8.54%
Others
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance				₩ 5,308		₩ 14,241
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)	[6]			594		(7,064)
Other comprehensive income(loss)				(643)		1,370
Disposals Settlements				₩ (5,259)		(3,239)
Ending balance						5,308
Changes in unobservable inputs financial assets liabilities recognition in other comprehensive income [Abstract]
Favorable changes in unobservable inputs in other comprehensive income(loss)	[11]					80
Unfavorable changes in unobservable inputs in other comprehensive income(loss)	[11]					₩ (80)
Derivative assets
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Fair value measurement technique		Option valuation model and others		Option valuation model and others		Option valuation model and others
Input variable		Correlation coefficient Volatility of underlying asset		Correlation coefficient Volatility of underlying asset		Correlation coefficient Volatility of underlying asset
Impact of changes in significant unobservable inputs on fair value measurement		Variation of fair value increases as correlation coefficient increases. Variation of fair value increases as volatility increases.		Variation of fair value increases as correlation coefficient increases. Variation of fair value increases as volatility increases.		Variation of fair value increases as correlation coefficient increases. Variation of fair value increases as volatility increases.
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 99		₩ 5,973		₩ 11,946
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)		329		3,877		7,375
Disposals Settlements		₩ (428)		(9,751)		(13,348)
Ending balance				₩ 99		₩ 5,973
Derivative assets | Bottom of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		12.10%		12.10%		12.10%
Range		90.00%		90.00%		90.00%
Derivative assets | Top of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		28.10%		28.10%		28.10%
Range		98.00%		98.00%		98.00%
Financial liabilities
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 707,233		₩ 825,958		₩ 403,704
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)		136,881		62,757		(14,968)
Purchases Issuances		500		1,155		768,013
Disposals Settlements		(663,606)		(182,637)		(329,392)
Transfer to or from level 3	[1]					(1,399)
Ending balance		181,008		707,233		825,958
Changes in unobservable inputs financial assets liabilities recognition in profit or loss [Abstract]
Favorable changes in unobservable inputs in net income(loss)		13		5,797		15,758
Unfavorable changes in unobservable inputs in net income(loss)		₩ (520)		₩ (4,425)		₩ (14,528)
Derivative liabilities
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Fair value measurement technique		Option valuation model and others		Option valuation model and others		Option valuation model and others
Input variable		Correlation coefficient Volatility of underlying asset		Correlation coefficient Volatility of underlying asset		Correlation coefficient Volatility of underlying asset
Impact of changes in significant unobservable inputs on fair value measurement		Variation of fair value increases as correlation coefficient increases. Variation of fair value increases as volatility increases.		Variation of fair value increases as correlation coefficient increases. Variation of fair value increases as volatility increases.		Variation of fair value increases as correlation coefficient increases. Variation of fair value increases as volatility increases.
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 33,524		₩ 78,607		₩ 41,711
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)		24,866		(8,322)		58,565
Purchases Issuances		500		1,155		4,008
Disposals Settlements		(37,939)		(37,916)		(24,475)
Transfer to or from level 3	[1],[3]					(1,202)
Ending balance		20,951		33,524		₩ 78,607
Description of reasons for transfers out of level3 of fair value hierarchy assets						As the variables used for the valuation of interest rate and equity related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.
Changes in unobservable inputs financial assets liabilities recognition in profit or loss [Abstract]
Favorable changes in unobservable inputs in net income(loss)	[4],[5]	5		4,892		₩ 13,469
Unfavorable changes in unobservable inputs in net income(loss)	[4],[5]	₩ (513)		₩ (3,568)		₩ (12,281)
Derivative liabilities | Bottom of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		12.10%		12.10%		12.10%
Range		90.00%		90.00%		90.00%
Derivative liabilities | Top of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		28.10%		28.10%		28.10%
Range		98.00%		98.00%		98.00%
Equity-linked securities
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Fair value measurement technique		Monte Carlo Simulation and others		Monte Carlo Simulation and others		Monte Carlo Simulation and others
Input variable		Correlation coefficient Volatility of underlying asset		Correlation coefficient Volatility of underlying asset		Correlation coefficient Volatility of underlying asset
Impact of changes in significant unobservable inputs on fair value measurement		Equity linked securities’ variation of fair value increases if both volatility and correlation coefficient increase. However when correlation coefficient decreases, despite the increase in volatility, the variation of fair value of equity linked securities may decrease.		Equity linked securities’ variation of fair value increases if both volatility and correlation coefficient increase. However when correlation coefficient decreases, despite the increase in volatility, the variation of fair value of equity linked securities may decrease.		Equity linked securities’ variation of fair value increases if both volatility and correlation coefficient increase. However when correlation coefficient decreases, despite the increase in volatility, the variation of fair value of equity linked securities may decrease.
Reconciliation of changes in level3 of fair value hierarchy [Abstract]
Beginning balance		₩ 673,709		₩ 747,351		₩ 361,993
Changes in financial assets liabilities measured at fair value level3 of the fair value hierarchy [Abstract]
Net Income(loss)	[6]	112,015		71,079		(73,533)
Purchases Issuances						764,005
Disposals Settlements		(625,667)		(144,721)		(304,917)
Transfer to or from level 3	[1],[12]					(197)
Ending balance		160,057		673,709		₩ 747,351
Description of reasons for transfers out of level3 of fair value hierarchy assets						Since the observable market data for equity-linked securities was available, such securities were transferred out of Level 3 into Level 2.
Changes in unobservable inputs financial assets liabilities recognition in profit or loss [Abstract]
Favorable changes in unobservable inputs in net income(loss)	[5]	8		905		₩ 2,289
Unfavorable changes in unobservable inputs in net income(loss)	[5]	₩ (7)		₩ (857)		₩ (2,247)
Equity-linked securities | Bottom of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		6.80%		6.80%		6.80%
Range		36.30%		36.30%		36.30%
Equity-linked securities | Top of range [Member]
Disclosure of significant unobservable inputs used in fair value measurement of financial instruments [Abstract]
Range		58.90%		58.90%		58.90%
Range		69.40%		69.40%		69.40%

[1] The Group recognizes transfers between levels at the end of reporting period within which events have occurred or conditions have changed.

[2] As the variables used for the valuation of currency related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.

[3] As the variables used for the valuation of interest rate and equity related derivatives became observable in the market, such derivatives were transferred out of Level 3 to Level 2.

[4] Both derivative assets and liabilities for held for trading and hedging are included.

[5] Fair value changes of equity related derivatives assets and liabilities and equity-linked securities are calculated by increasing or decreasing historical volatility of the stock price and correlation, which are major unobservable variables, by 10%, respectively. In the case of interest rate related derivative assets and liabilities, fair value changes are calculated by increasing or decreasing the volatility of interest rate, which are major unobservable variables, by 10%, respectively.

[6] From financial assets and liabilities classified as Level 3 that the Group holds as at the end of the year, losses of 2,854 million Won, 94,238 million Won and 34,621 million Won for the year ended December 31 2015, 2016 and 2017, respectively, were recognized in net gain (loss) on financial instruments at FVTPL and net gain (loss) on AFS financial assets in the comprehensive income statements.

[7] Fair value changes are measured by increasing or decreasing the discount rate by 10%, which is major unobservable variable, respectively.

[8] AFS financial assets were transferred out of level 1 to level 3 upon the change of the fair value measurement method of the assets by using market the external valuation specialists from previously using quoted prices in the active market, in the opposite case, they were transferred out of level 3 to level 1.

[9] Among the equity securities, whereas the sensitivity analysis of the capital contributions and beneficiary certificates is not possible in practice, fair value changes of such securities whose major unobservable variables are composed of the real estate are calculated by increasing or decreasing price fluctuation of real estate which is underlying assets and discount rate by 1%.

[10] Fair value changes of equity securities are calculated by increasing or decreasing growth rate (0~1%) and discount rate or liquidation value (-1~1%) and discount rate. The growth rate, discount rate, and liquidation value are major unobservable variables.

[11] Fair value changes of other securities are calculated by increasing or decreasing price fluctuation of trust property or real estate which is underlying assets and discount rate by 1%. The prices of trust property and real estates and discount rate are major unobservable variables.

[12] Since the observable market data for equity-linked securities was available, such securities were transferred out of Level 3 into Level 2.

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Fair Value Of Financial Assets And Liabilities Fair value and carrying amount of financial assets and liabilities measured at amortized cost (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2017 USD ($)
Fair value of financial assets liabilities measured at amortised cost [Abstract]
Held-to-maturity financial assets	₩ 16,715,679	₩ 13,985,177
Loans and receivables	265,570,649	259,565,952
Deposits due to customers	234,682,775	221,001,466
Borrowings	14,754,506	18,785,325
Debentures	27,889,781	24,004,668
Other financial liabilities	13,890,789	21,984,171
Carrying value of financial assets liabilities measured at amortised cost [Abstract]
Held-to-maturity financial assets	16,749,296	13,910,251	$ 15,691,383
Loans and receivables	267,106,204	258,392,633	250,235,337
Deposits due to customers	234,695,084	221,020,411	219,871,357
Borrowings	14,784,706	18,769,515	13,850,880
Debentures	27,869,651	23,565,449	26,109,358
Other financial liabilities	13,892,461	21,985,086	$ 13,014,991
HTM financial assets | Level 1
Fair value of financial assets liabilities measured at amortised cost [Abstract]
Held-to-maturity financial assets	₩ 1,206,292	₩ 741,880
Disclosure of financial assets liabilities measured at amortised [Abstract]
Fair value measurement technique	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.
Input variables	Risk-free market rate, Credit spread	Risk-free market rate, Credit spread
HTM financial assets | Level 2
Fair value of financial assets liabilities measured at amortised cost [Abstract]
Held-to-maturity financial assets	₩ 15,509,387	₩ 13,243,297
Disclosure of financial assets liabilities measured at amortised [Abstract]
Fair value measurement technique	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.	The fair value is measured by discounting the projected cash flows of debt securities by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the issuers of the securities.
Input variables	Risk-free market rate, Credit spread	Risk-free market rate, Credit spread
Loans and receivables | Level 3
Fair value of financial assets liabilities measured at amortised cost [Abstract]
Loans and receivables	₩ 265,570,649	₩ 259,565,952
Disclosure of financial assets liabilities measured at amortised [Abstract]
Fair value measurement technique	The fair value is measured by discounting the projected cash flows of loan products by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the debtor.	The fair value is measured by discounting the projected cash flows of loan products by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the debtor.
Input variables	Risk-free market rate, Credit spread, Prepayment-rate	Risk-free market rate, Credit spread, Prepayment-rate
Deposits due to customers | Level 2
Fair value of financial assets liabilities measured at amortised cost [Abstract]
Deposits due to customers	₩ 234,682,775	₩ 221,001,466
Disclosure of financial assets liabilities measured at amortised [Abstract]
Fair value measurement technique	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting the credit rating of the Group.	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting the credit rating of the Group.
Input variables	Risk-free market rate, Forward rate	Risk-free market rate, Forward rate
Borrowings | Level 2
Fair value of financial assets liabilities measured at amortised cost [Abstract]
Borrowings	₩ 14,754,506	₩ 18,785,325
Disclosure of financial assets liabilities measured at amortised [Abstract]
Fair value measurement technique	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting the credit rating of the Group.	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting the credit rating of the Group.
Input variables	Risk-free market rate, Forward rate	Risk-free market rate, Forward rate
Debentures | Level 2
Fair value of financial assets liabilities measured at amortised cost [Abstract]
Debentures	₩ 27,889,781	₩ 24,004,668
Disclosure of financial assets liabilities measured at amortised [Abstract]
Fair value measurement technique	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting the credit rating of the Group.	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting the credit rating of the Group.
Input variables	Risk-free market rate, Forward rate	Risk-free market rate, Forward rate
Other financial liabilities | Level 2
Fair value of financial assets liabilities measured at amortised cost [Abstract]
Other financial liabilities	₩ 13,890,789	₩ 21,984,171
Disclosure of financial assets liabilities measured at amortised [Abstract]
Fair value measurement technique	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting the credit rating of the Group.	The fair value is measured by discounting the projected cash flows of debt products by applying the market discount rate that is reflecting the credit rating of the Group.
Input variables	Risk-free market rate, Forward rate	Risk-free market rate, Forward rate

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Derecognition And Offset Of Financial Instruments Transferred financial assets that are derecognized in their entirety (Details) - Conditional disposal of loans to KAMCO - KRW (₩)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Disclosure of continuing involvement in derecognised financial assets [Line Items]
Classification		Off-balance Item		Off-balance Item
Carrying amount of Continuing involvement Asset	[1]	₩ 0		₩ 0
Carrying amount of Continuing involvement Liability	[1]	0		0
Fair value amount of Continuing involvement Asset	[1]	0		0
Fair value amount of Continuing involvement Liability	[1]	0		0
Maximum exposure to loss		₩ 0	[1]	₩ 701,000,000
Line items of recognised assets and liabilities representing continuing involvement in derecognised financial assets		KAMCO is still in the process of collecting cash flows related to the transferred assets and the maximum exposure to loss represents the carrying amounts of the assets at the date when they were transferred to KAMCO. Under previous K-GAAP, the Group derecognized the transferred assets although the Group retains and continues to retain substantially all such risks and rewards and according to the transition exemptions in IFRS 1 “First-time adoption of International Financial Reporting Standard”, the Group did not reassess the derecognition criteria for these transfers. As the process of collecting cash flows is completed, there is no financial instruments that qualify for derecognition but the Group still has continuous involvement as of December 31, 2017		KAMCO is still in the process of collecting cash flows related to the transferred assets and the maximum exposure to loss represents the carrying amounts of the assets at the date when they were transferred to KAMCO. Under previous K-GAAP, the Group derecognized the transferred assets although the Group retains and continues to retain substantially all such risks and rewards and according to the transition exemptions in IFRS 1 “First-time adoption of International Financial Reporting Standard”, the Group did not reassess the derecognition criteria for these transfers. As the process of collecting cash flows is completed, there is no financial instruments that qualify for derecognition but the Group still has continuous involvement as of December 31, 2017

[1] KAMCO is still in the process of collecting cash flows related to the transferred assets and the maximum exposure to loss represents the carrying amounts of the assets at the date when they were transferred to KAMCO. Under previous Korea Generally Accepted Accounting Principles (K-GAAP), the Group derecognized the transferred assets although the Group retains and continues to retain substantially all such risks and rewards and according to the transition exemptions in IFRS 1 “First-time adoption of International Financial Reporting Standard”, the Group did not reassess the derecognition criteria for these transfers. As the process of collecting cash flows is completed, there is no financial instruments that qualify for derecognition but the Group still has continuous involvement as of December 31, 2017.

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Derecognition And Offset Of Financial Instruments Transferred financial assets that are not derecognized in their entirety (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disposal of securities under repurchase agreements
Disclosure of financial assets transferred during period which do not qualify for derecognition [Line Items]
Nature of financial assets transferred during period which do not qualify for derecognition	The financial instruments that were disposed but the Group agreed to repurchase at the fixed amounts at the same time, so that they did not meet the conditions of derecognition	The financial instruments that were disposed but the Group agreed to repurchase at the fixed amounts at the same time, so that they did not meet the conditions of derecognition
Assets that entity continues to recognise	₩ 15,434	₩ 2,553,816
Associated liabilities that entity continues to recognise	3,173	2,004,905
AFS financial assets
Disclosure of financial assets transferred during period which do not qualify for derecognition [Line Items]
Assets that entity continues to recognise	9,998	2,546,683
HTM financial assets
Disclosure of financial assets transferred during period which do not qualify for derecognition [Line Items]
Assets that entity continues to recognise	₩ 5,436	₩ 7,133
Loaned securities
Disclosure of financial assets transferred during period which do not qualify for derecognition [Line Items]
Nature of financial assets transferred during period which do not qualify for derecognition	When the Group loans its securities to outside parties, the legal ownerships of the securities are transferred, however, they should be returned at the end of lending period therefore the Group does not derecognize them from the consolidated financial statements as it owns majority of risks and benefits from the securities continuously regardless of the transfer of legal ownership.	When the Group loans its securities to outside parties, the legal ownerships of the securities are transferred, however, they should be returned at the end of lending period therefore the Group does not derecognize them from the consolidated financial statements as it owns majority of risks and benefits from the securities continuously regardless of the transfer of legal ownership.
Assets that entity continues to recognise	₩ 170,256	₩ 498,038
Equity securities- listed stock | Samsung Securities Co Ltd and others
Disclosure of financial assets transferred during period which do not qualify for derecognition [Line Items]
Assets that entity continues to recognise		4,459
Korean treasury and government agencies bonds | Korea Securities Depository and others
Disclosure of financial assets transferred during period which do not qualify for derecognition [Line Items]
Assets that entity continues to recognise	₩ 170,256	₩ 493,579

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Derecognition And Offset Of Financial Instruments Financial assets subject to offset enforceable master netting agreements or similar agreements (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Net financial assets subject to offsetting enforceable master netting arrangements or similar agreements in statement of financial position [Abstract]
Gross amounts of recognized financial assets		₩ 62,669,493	₩ 47,951,934
Gross amounts of recognized financial assets set off		38,987,064	30,891,723
Net amounts of financial assets presented		23,682,429	17,060,211
Related amounts not set off in the consolidated statement of financial position
Netting agreements and others		22,646,512	15,400,985
Cash collateral received		174,415	69,834
Net amounts		₩ 861,502	₩ 1,589,392
Description of rights of setoff associated with financial assets subject to enforceable master netting arrangement or similar agreement		The Group has the right to offset certain derivatives assets and liabilities (including corresponding cash collateral placed or received) as well as certain spot foreign exchange receivables in case of default, insolvency or bankruptcy by one of the counterparties. These agreements do not qualify for offsetting on the Group’s balance sheet under IAS 32. The Group has entered into a sale under repurchase agreements and accounted it as collateralized borrowing. Also, the Group has entered into a purchase under resale agreement and accounted it as secured loans. The repurchase and resale agreement can have the offsetting right only under the trading party’s default, insolvency, or bankruptcy which do not satisfy the offsetting criteria of IAS 32, the Group recorded the collateralized borrowings in borrowings and the secured loans in loans and receivables. The Group under the repurchase agreements has offsetting right only upon the counter-party’s default, insolvency or bankruptcy, thus the repurchase agreements are applied by the TBMA/ISMA Global Master Repurchase Agreement of which do not satisfy the offsetting criteria of IAS 32. The Group disclosed bonds sold (purchased) under repurchase agreements as borrowings (loans and receivables).	The Group has the right to offset certain derivatives assets and liabilities (including corresponding cash collateral placed or received) as well as certain spot foreign exchange receivables in case of default, insolvency or bankruptcy by one of the counterparties. These agreements do not qualify for offsetting on the Group’s balance sheet under IAS 32. The Group has entered into a sale under repurchase agreements and accounted it as collateralized borrowing. Also, the Group has entered into a purchase under resale agreement and accounted it as secured loans. The repurchase and resale agreement can have the offsetting right only under the trading party’s default, insolvency, or bankruptcy which do not satisfy the offsetting criteria of IAS 32, the Group recorded the collateralized borrowings in borrowings and the secured loans in loans and receivables. The Group under the repurchase agreements has offsetting right only upon the counter-party’s default, insolvency or bankruptcy, thus the repurchase agreements are applied by the TBMA/ISMA Global Master Repurchase Agreement of which do not satisfy the offsetting criteria of IAS 32. The Group disclosed bonds sold (purchased) under repurchase agreements as borrowings (loans and receivables).
Derivative assets and others
Net financial assets subject to offsetting enforceable master netting arrangements or similar agreements in statement of financial position [Abstract]
Gross amounts of recognized financial assets	[1]	₩ 2,992,476	₩ 2,962,969
Gross amounts of recognized financial assets set off	[1]	1,710	8,442
Net amounts of financial assets presented	[1]	2,990,766	2,954,527
Receivable spot exchange
Net financial assets subject to offsetting enforceable master netting arrangements or similar agreements in statement of financial position [Abstract]
Gross amounts of recognized financial assets	[1]	3,767,726	4,678,089
Net amounts of financial assets presented	[1]	3,767,726	4,678,089
Derivative financial instruments assets and receivable spot exchange [Member]
Related amounts not set off in the consolidated statement of financial position
Netting agreements and others		5,787,448	6,546,232
Cash collateral received		174,415	69,834
Net amounts		796,629	1,016,550
Bonds purchased under resale agreements
Net financial assets subject to offsetting enforceable master netting arrangements or similar agreements in statement of financial position [Abstract]
Gross amounts of recognized financial assets	[1]	16,859,064	8,854,753
Net amounts of financial assets presented	[1]	16,859,064	8,854,753
Related amounts not set off in the consolidated statement of financial position
Netting agreements and others		16,859,064	8,854,753
Domestic exchanges receivable
Net financial assets subject to offsetting enforceable master netting arrangements or similar agreements in statement of financial position [Abstract]
Gross amounts of recognized financial assets	[1],[2]	39,050,227	31,456,123
Gross amounts of recognized financial assets set off	[1],[2]	38,985,354	30,883,281
Net amounts of financial assets presented	[1],[2]	64,873	572,842
Related amounts not set off in the consolidated statement of financial position
Net amounts		₩ 64,873	₩ 572,842

[1] Others include derivatives held for trading, derivatives for hedging and equity linked securities related to derivatives.

[2] Certain financial assets and liabilities are presented as offset.

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Derecognition And Offset Of Financial Instruments Financial liabilities subject to offset enforceable master netting agreements or similar agreements (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Net financial liabilities subject to offsetting enforceable master netting arrangements or similar agreements in statement of financial position [Abstract]
Gross amounts of recognized financial liabilities		₩ 47,171,791	₩ 49,500,578
Gross amounts of recognized financial liabilities set off		38,987,064	30,891,723
Net amounts of financial liabilities presented		8,184,727	18,608,855
Related amounts not set off in the consolidated statement of financial position
Netting agreements and others		7,163,786	14,861,118
Cash collateral pledged		157,750	105,270
Net amounts		₩ 863,191	₩ 3,642,467
Description of rights of setoff associated with financial liabilities subject to enforceable master netting arrangement or similar agreement		The Group has the right to offset certain derivatives assets and liabilities (including corresponding cash collateral placed or received) as well as certain spot foreign exchange receivables in case of default, insolvency or bankruptcy by one of the counterparties. These agreements do not qualify for offsetting on the Group’s balance sheet under IAS 32. The Group has entered into a sale under repurchase agreements and accounted it as collateralized borrowing. Also, the Group has entered into a purchase under resale agreement and accounted it as secured loans. The repurchase and resale agreement can have the offsetting right only under the trading party’s default, insolvency, or bankruptcy which do not satisfy the offsetting criteria of IAS 32, the Group recorded the collateralized borrowings in borrowings and the secured loans in loans and receivables. The Group under the repurchase agreements has offsetting right only upon the counter-party’s default, insolvency or bankruptcy, thus the repurchase agreements are applied by the TBMA/ISMA Global Master Repurchase Agreement of which do not satisfy the offsetting criteria of IAS 32. The Group disclosed bonds sold (purchased) under repurchase agreements as borrowings (loans and receivables).	The Group has the right to offset certain derivatives assets and liabilities (including corresponding cash collateral placed or received) as well as certain spot foreign exchange receivables in case of default, insolvency or bankruptcy by one of the counterparties. These agreements do not qualify for offsetting on the Group’s balance sheet under IAS 32. The Group has entered into a sale under repurchase agreements and accounted it as collateralized borrowing. Also, the Group has entered into a purchase under resale agreement and accounted it as secured loans. The repurchase and resale agreement can have the offsetting right only under the trading party’s default, insolvency, or bankruptcy which do not satisfy the offsetting criteria of IAS 32, the Group recorded the collateralized borrowings in borrowings and the secured loans in loans and receivables. The Group under the repurchase agreements has offsetting right only upon the counter-party’s default, insolvency or bankruptcy, thus the repurchase agreements are applied by the TBMA/ISMA Global Master Repurchase Agreement of which do not satisfy the offsetting criteria of IAS 32. The Group disclosed bonds sold (purchased) under repurchase agreements as borrowings (loans and receivables).
Derivative liabilities and others
Net financial liabilities subject to offsetting enforceable master netting arrangements or similar agreements in statement of financial position [Abstract]
Gross amounts of recognized financial liabilities	[1]	₩ 3,160,217	₩ 3,467,374
Gross amounts of recognized financial liabilities set off	[1]	1,710	8,442
Net amounts of financial liabilities presented	[1]	3,158,507	3,458,932
Payable spot exchange
Net financial liabilities subject to offsetting enforceable master netting arrangements or similar agreements in statement of financial position [Abstract]
Gross amounts of recognized financial liabilities	[2]	3,723,886	4,682,775
Net amounts of financial liabilities presented	[2]	3,723,886	4,682,775
Derivative financial instruments liabilities and payable spot exchange [Member]
Related amounts not set off in the consolidated statement of financial position
Netting agreements and others		5,866,682	6,695,062
Cash collateral pledged		157,750	105,270
Net amounts		857,961	1,341,375
Bonds sold under repurchase agreements
Net financial liabilities subject to offsetting enforceable master netting arrangements or similar agreements in statement of financial position [Abstract]
Gross amounts of recognized financial liabilities	[3]	3,173	2,004,905
Net amounts of financial liabilities presented	[3]	3,173	2,004,905
Related amounts not set off in the consolidated statement of financial position
Netting agreements and others		3,173	2,004,905
Domestic exchange payable
Net financial liabilities subject to offsetting enforceable master netting arrangements or similar agreements in statement of financial position [Abstract]
Gross amounts of recognized financial liabilities	[2],[4]	40,284,515	39,345,524
Gross amounts of recognized financial liabilities set off	[2],[4]	38,985,354	30,883,281
Net amounts of financial liabilities presented	[2],[4]	1,299,161	8,462,243
Related amounts not set off in the consolidated statement of financial position
Netting agreements and others		1,293,931	6,161,151
Net amounts		₩ 5,230	₩ 2,301,092

[1] Others include derivatives held for trading, derivatives for hedging and equity linked securities related to derivatives.

[2] Items are included in other financial liabilities.

[3] Items are included in borrowings.

[4] Certain financial assets and liabilities are presented as offset.

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Investment In Joint Ventures And Associates Investments in joint ventures and associates accounted for using the equity method of accounting (Details) - KRW (₩)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Disclosure of investments in associates and joint ventures [Line Items]
Description of reasons why presumption that interest of more than twenty per cent in associate is overcome		Even though the Group’s ownership interest of the entity is more than 20%, the Group does not have significant influence over the entity since it is going through work-out process under receivership, thus it is excluded from the investment in associates.		Even though the Group’s ownership interest of the entity is more than 20%, the Group does not have significant influence over the entity since it is going through work-out process under receivership, thus it is excluded from the investment in associates.
Woori Blackstone Korea Opportunity Private Equity Fund No.1
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Other finance business		Other finance business
Proportion of ownership interest in associates and joint ventures				26.40%	[1]	26.40%
Description of nature of entitys relationship with associate		(*19) It has been removed from the list of associated companies as it was liquidated during the current period.	[1]	(*19) It has been removed from the list of associated companies as it was liquidated during the current period.
Kumho Tire Co Inc
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Manufacturing		Manufacturing
Proportion of ownership interest in associates and joint ventures		14.20%	[2],[3]	14.20%	[2],[3]	14.20%
Financial statements as of 2017	[4]	Sep. 30, 2017		Sep. 30, 2016
Description of reason why using different reporting date or period for associate		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.
Description of nature of entitys relationship with associate		(*1) The Group has significant influence on these entities through its position in the creditors' council which is the decision making body regarding to financial and operational policies of associates. (*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won).		(*1) The Group has significant influence on these entities through its position in the creditors' council which is the decision making body regarding to financial and operational policies of associates. (*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won).
Fair value of investments in associates for which there are quoted market prices	[3]	₩ 4,425		₩ 8,480
Woori Service Networks Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Freight & staffing services		Freight & staffing services
Proportion of ownership interest in associates and joint ventures		4.90%	[5]	4.90%	[5]	4.90%
Financial statements as of 2017	[4]	Nov. 30, 2017		Nov. 30, 2016
Description of reason why using different reporting date or period for associate		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.
Description of nature of entitys relationship with associate		(*4) Most of the significant business transactions of associates are with the Group as of December 31, 2017 and 2016.		(*4) Most of the significant business transactions of associates are with the Group as of December 31, 2017 and 2016.
Korea Credit Bureau Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Credit information		Credit information
Proportion of ownership interest in associates and joint ventures		9.90%	[6]	9.90%	[6]	9.90%
Financial statements as of 2017		Dec. 31, 2017		Dec. 31, 2016
Description of nature of entitys relationship with associate		(*5) The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.		(*5) The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.
Korea Finance Security Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Security service		Security service
Proportion of ownership interest in associates and joint ventures		15.00%	[5]	15.00%	[5]	15.00%
Financial statements as of 2017	[4]	Nov. 30, 2017		Nov. 30, 2016
Description of reason why using different reporting date or period for associate		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.
Description of nature of entitys relationship with associate		(*4) Most of the significant business transactions of associates are with the Group as of December 31, 2017 and 2016.		(*4) Most of the significant business transactions of associates are with the Group as of December 31, 2017 and 2016.
Chin Hung International Inc
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Construction		Construction
Proportion of ownership interest in associates and joint ventures		25.30%	[3],[7]	28.40%	[3],[7]	28.40%
Financial statements as of 2017	[4]	Nov. 30, 2017		Nov. 30, 2016
Description of reason why using different reporting date or period for associate		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.
Description of nature of entitys relationship with associate		(*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won). (*9) Due to consolidation of stocks and debt-equity swap, the Group’s number of holding shares and ownership ratio have decreased.		(*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won). (*9) Due to consolidation of stocks and debt-equity swap, the Group’s number of holding shares and ownership ratio have decreased.
Fair value of investments in associates for which there are quoted market prices	[3]	₩ 1,915		₩ 2,090
Poonglim Industrial Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Construction		Construction
Proportion of ownership interest in associates and joint ventures		29.40%	[8],[9],[10]	31.00%	[8],[9],[10]	30.70%
Financial statements as of 2017	[4]	Sep. 30, 2017		Sep. 30, 2016
Description of reason why using different reporting date or period for associate		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*12) The Group has sold a part of shares of the associates so the number of shares holding has decreased during the years ended December 31, 2017. (*14) As the carrying amounts of certain investments in associates had been reduced to zero, the Group discontinued the use of the equity method in accounting for those investments, and unrecognized losses due to the restricted application of equity method amount to 16,344 million Won and 612 million Won as of December 31, 2017 and 2016, respectively.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*12) The Group has sold a part of shares of the associates so the number of shares holding has decreased during the years ended December 31, 2017. (*14) As the carrying amounts of certain investments in associates had been reduced to zero, the Group discontinued the use of the equity method in accounting for those investments, and unrecognized losses due to the restricted application of equity method amount to 16,344 million Won and 612 million Won as of December 31, 2017 and 2016, respectively.
Unrecognised share of losses of associates		₩ 16,344,000,000		₩ 612,000,000
STX Engine Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Manufacturing		Manufacturing
Proportion of ownership interest in associates and joint ventures		29.20%	[2],[3],[11]	29.20%	[2],[3]	29.20%
Description of nature of entitys relationship with associate		(*1) The Group has significant influence on these entities through its position in the creditors' council which is the decision making body regarding to financial and operational policies of associates. (*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won). (*20) The shares of STX Engine Co., Ltd. owned by the Group were reclassified as assets held for sale, as the creditor financial institutions committee entered into a contract with UAMCO.,Ltd during the current period to sell STX Engine Co., Ltd. shares.		(*1) The Group has significant influence on these entities through its position in the creditors' council which is the decision making body regarding to financial and operational policies of associates. (*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won). (*20) The shares of STX Engine Co., Ltd. owned by the Group were reclassified as assets held for sale, as the creditor financial institutions committee entered into a contract with UAMCO.,Ltd during the current period to sell STX Engine Co., Ltd. shares.
Fair value of investments in associates for which there are quoted market prices		₩ 9,150	[3]	₩ 6,630
Samho International Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Construction		Construction
Proportion of ownership interest in associates and joint ventures				7.80%	[3],[12]	7.80%
Description of nature of entitys relationship with associate		(*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won). (*18) The entity was sold after it was transferred to assets held for sale and was excluded from the investment in associates.	[12]	(*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won). (*18) The entity was sold after it was transferred to assets held for sale and was excluded from the investment in associates.
Fair value of investments in associates for which there are quoted market prices	[3]			₩ 16,900
Force TEC Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Freight & staffing services		Freight & staffing services
Proportion of ownership interest in associates and joint ventures	[10],[13]			34.40%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*15) Not in scope for the associates, because the Group does not have significant influence over the entity due to the fact that it is going through workout process under receivership as of December 31, 2017.	[13]	(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*15) Not in scope for the associates, because the Group does not have significant influence over the entity due to the fact that it is going through workout process under receivership as of December 31, 2017.
STX Corporation
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Wholesale of non-specialized goods		Wholesale of non-specialized goods
Proportion of ownership interest in associates and joint ventures		19.70%	[2],[3],[14]	9.50%	[2],[3],[10]	15.00%
Financial statements as of 2017	[4]	Sep. 30, 2017		Sep. 30, 2016
Description of reason why using different reporting date or period for associate		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.
Description of nature of entitys relationship with associate		(*1) The Group has significant influence on these entities through its position in the creditors' council which is the decision making body regarding to financial and operational policies of associates. (*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won). (*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*13) Due to debt-equity swap capital stock, the Group ownership ratio has increased during the years ended December 31, 2017.		(*1) The Group has significant influence on these entities through its position in the creditors' council which is the decision making body regarding to financial and operational policies of associates. (*2) The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won). (*6) The carrying values of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017 and those of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2017 and 2016. (*13) Due to debt-equity swap capital stock, the Group ownership ratio has increased during the years ended December 31, 2017.
Fair value of investments in associates for which there are quoted market prices	[3]			₩ 1,660
Saman Corporation
Disclosure of investments in associates and joint ventures [Line Items]
Main business		General construction Technology service		General construction Technology service
Proportion of ownership interest in associates and joint ventures		9.20%	[6]	9.20%	[6]	9.20%
Financial statements as of 2017	[4]	Sep. 30, 2017		Sep. 30, 2016
Description of reason why using different reporting date or period for associate		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.
Description of nature of entitys relationship with associate		(*5) The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.		(*5) The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.
Dongwoo C and C Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Construction		Construction
Proportion of ownership interest in associates and joint ventures	[10]	23.20%		23.20%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
SJCO Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Aggregate transportation and wholesale		Aggregate transportation and wholesale
Proportion of ownership interest in associates and joint ventures	[10]	26.50%		26.50%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
G2 Collection Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Wholesale and retail sales		Wholesale and retail sales
Proportion of ownership interest in associates and joint ventures	[10]	28.90%		28.90%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
The Base Enterprise Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Manufacturing		Manufacturing
Proportion of ownership interest in associates and joint ventures	[10]	48.40%		48.40%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
Heungjiwon Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Other printing		Other printing
Proportion of ownership interest in associates and joint ventures	[10],[15]			27.80%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*17) As the Group sold its entire ownership interest of the entities, it was exclude from the investment in associates during the years ended December 31, 2017.	[16]	(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*17) As the Group sold its entire ownership interest of the entities, it was exclude from the investment in associates during the years ended December 31, 2017.
Kyesan engineering Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Construction		Construction
Proportion of ownership interest in associates and joint ventures	[10]	23.20%		23.20%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6) The carrying values of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017 and those of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2017 and 2016.
Good software lab Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Service		Service
Proportion of ownership interest in associates and joint ventures	[10]	28.90%		28.90%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
Wongwang Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Wholesale and real estate		Wholesale and real estate
Proportion of ownership interest in associates and joint ventures	[10]	29.00%		29.00%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
Sejin construction Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Construction		Construction
Proportion of ownership interest in associates and joint ventures	[10]	29.60%		29.60%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
Deokwon food Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Poultry processing and storage		Poultry processing and storage
Proportion of ownership interest in associates and joint ventures	[10],[16]			27.30%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*17) As the Group sold its entire ownership interest of the entities, it was exclude from the investment in associates during the years ended December 31, 2017.	[16]	(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*17) As the Group sold its entire ownership interest of the entities, it was exclude from the investment in associates during the years ended December 31, 2017.
QTS shipping Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Complex transportation brokerage		Complex transportation brokerage
Proportion of ownership interest in associates and joint ventures	[10]	49.40%		49.40%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
DAEA SNC Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Wholesale and retail sales		Wholesale and retail sales
Proportion of ownership interest in associates and joint ventures	[10]	24.00%		24.00%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
ARES TECH Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Electronic component manufacturing		Electronic component manufacturing
Proportion of ownership interest in associates and joint ventures	[10]	23.40%		23.40%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
Reading Doctors Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Other service business
Proportion of ownership interest in associates and joint ventures	[10],[17]	35.40%
Description of reasons why presumption that interest of more than twenty per cent in associate is overcome		(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
PREXCO Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Manufacturing
Proportion of ownership interest in associates and joint ventures	[10],[17]	28.10%
Description of reasons why presumption that interest of more than twenty per cent in associate is overcome		(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
Hyunwoo International Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Manufacturing
Proportion of ownership interest in associates and joint ventures	[10],[17]	25.90%
Description of reasons why presumption that interest of more than twenty per cent in associate is overcome		(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*16) Due to debt-equity swap, the entity was included in the investment in associates during the years ended December 31, 2017.
Jiwon Plating Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Plating
Proportion of ownership interest in associates and joint ventures	[10],[18]	20.50%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*16) Due to debt-equity swap, the entity was included in the investment in associates during the years ended December 31, 2017.
Cultizm Korea LTD Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Wholesale and retail sales
Proportion of ownership interest in associates and joint ventures	[10],[18]	31.30%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*16) Due to debt-equity swap, the entity was included in the investment in associates during the years ended December 31, 2017.
Gil Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Manufacturing
Proportion of ownership interest in associates and joint ventures	[10],[18]	26.10%
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017. (*16) Due to debt-equity swap, the entity was included in the investment in associates during the years ended December 31, 2017.
Nk Eng Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Manufacturing
Proportion of ownership interest in associates and joint ventures	[10],[17]	23.10%
Description of reasons why presumption that interest of more than twenty per cent in associate is overcome		(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.
Description of nature of entitys relationship with associate		(*6)The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.
Woori Growth Partnerships New Technology Private Equity Fund
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Other financial business		Other financial business
Proportion of ownership interest in associates and joint ventures		23.10%		23.10%
Financial statements as of 2017		Dec. 31, 2017		Dec. 31, 2016
2016KIF-IMM Woori Bank Technology Venture Fund
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Other financial business		Other financial business
Proportion of ownership interest in associates and joint ventures		20.00%		20.00%
Financial statements as of 2017		Dec. 31, 2017		Dec. 31, 2016
K BANK Co Ltd
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Finance		Finance
Proportion of ownership interest in associates and joint ventures	[6]	13.80%		13.00%
Financial statements as of 2017	[4]	Nov. 30, 2017		Nov. 30, 2016
Description of reason why using different reporting date or period for associate		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.
Description of nature of entitys relationship with associate		(*5) The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.		(*5) The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.
Smart Private Equity Fund No.2
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Other financial business
Proportion of ownership interest in associates and joint ventures	[19]	20.00%
Financial statements as of 2017		Dec. 31, 2017
Description of nature of entitys relationship with associate		(*11) Due to capital contribution by the Group during the years ended December 31, 2017, the entities were included in the investment in associates.
Woori Bank-Company K Korea Movie Asset Fund
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Other financial business
Proportion of ownership interest in associates and joint ventures	[19]	25.00%
Financial statements as of 2017		Dec. 31, 2017
Description of nature of entitys relationship with associate		(*11) Due to capital contribution by the Group during the years ended December 31, 2017, the entities were included in the investment in associates.
Well to Sea No.3 Private Equity Fund
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Finance
Proportion of ownership interest in associates and joint ventures	[19]	50.00%
Financial statements as of 2017	[4]	Sep. 30, 2017
Description of reason why using different reporting date or period for associate		(*3) The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.
Description of nature of entitys relationship with associate		(*11) Due to capital contribution by the Group during the years ended December 31, 2017, the entities were included in the investment in associates.
Woori Renaissance Holdings Inc
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Other financial business		Other financial business
Proportion of ownership interest in associates and joint ventures				51.60%	[20]	51.60%
Description of nature of entitys relationship with associate		(*7) The Group owns over 50% ownership as of December 31, 2016. However, the investment in this entity was accounted for using equity method as the ownership and related contracts meet the definition of joint arrangement under K-IFRS 1111 Joint Arrangements. As of December 31, 2017 the entity has been excluded from the range of associates as liquidated.	[20]	(*7) The Group owns over 50% ownership as of December 31, 2016. However, the investment in this entity was accounted for using equity method as the ownership and related contracts meet the definition of joint arrangement under K-IFRS 1111 Joint Arrangements. As of December 31, 2017 the entity has been excluded from the range of associates as liquidated.
Woori Columbus First Private Equity Fund
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Other financial business		Other financial business
Proportion of ownership interest in associates and joint ventures				0.20%	[21]	1.90%
Description of nature of entitys relationship with associate		(*8) As a general partner of Woori Columbus 1st Private Equity Fund, the Group had significant influence over the entity’s operational and financial policy making process, including participating in making decision of dividend or other distribution. As such, the investment in this entity was accounted for using equity method as of December 31, 2016. The Woori Columbus 1st Private Equity Fund has been removed from the list of associated companies as it was liquidated during the current period.	[21]	(*8) As a general partner of Woori Columbus 1st Private Equity Fund, the Group had significant influence over the entity’s operational and financial policy making process, including participating in making decision of dividend or other distribution. As such, the investment in this entity was accounted for using equity method as of December 31, 2016. The Woori Columbus 1st Private Equity Fund has been removed from the list of associated companies as it was liquidated during the current period.
Nomura-Rifa Private Real Estate Investment Trust No.17
Disclosure of investments in associates and joint ventures [Line Items]
Main business		Other financial business
Proportion of ownership interest in associates and joint ventures	[19]	25.00%
Financial statements as of 2017		Dec. 31, 2017
Description of nature of entitys relationship with associate		(*11) Due to capital contribution by the Group during the years ended December 31, 2017, the entities were included in the investment in associates.

[1] It has been removed from the list of associated companies as it was liquidated during the current period.

[2] The Group has significant influence on these entities through its position in the creditors' council which is the decision making body regarding to financial and operational policies of associates.

[3] The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won).

[4] The significant transactions and events between the end of reporting period of the associates and the Group have been properly incorporated.

[5] Most of the significant business transactions of associates are with the Group as of December 31, 2016 and 2017.

[6] The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.

[7] Due to consolidation of stocks and debt-equity swap, the Group’s number of holding shares and ownership ratio have decreased.

[8] As the carrying amounts of certain investments in associates had been reduced to zero, the Group discontinued the use of the equity method in accounting for those investments, and unrecognized losses due to the restricted application of equity method amount to 612 million Won and 16,344 million Won as of December 31, 2016 and 2017, respectively.

[9] The Group has sold a part of shares of the associates so the number of shares holding has decreased during the years ended December 31, 2017.

[10] The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.

[11] The shares of STX Engine Co., Ltd. owned by the Group were reclassified as assets held for sale, as the creditor financial institutions committee entered into a contract with UAMCO.,Ltd during the current period to sell STX Engine Co., Ltd. shares.

[12] The entity was sold after it was transferred to assets held for sale and was excluded from the investment in associates.

[13] Not in scope for the associates, because the Group does not have significant influence over the entity due to the fact that it is going through workout process under receivership as of December 31, 2017.

[14] Due to debt-equity swap capital stock, the Group ownership ratio has increased during the years ended December 31, 2017.

[15] As the Group sold its ownership interests in the entities during the year ended December 31, 2016, these entities were excluded from the investment in associates.

[16] As the Group sold its entire ownership interest of the entities, it was exclude from the investment in associates during the years ended December 31, 2017.

[17] Even though the Group’s ownership interest of the entity is more than 20%, the Group does not have significant influence over the entity since it is going through work-out process under receivership, thus it is excluded from the investment in associates.

[18] Due to debt-equity swap, the entity was included in the investment in associates during the years ended December 31, 2017.

[19] Due to capital contribution by the Group during the years ended December 31, 2017, the entities were included in the investment in associates.

[20] The Group owns over 50% ownership as of December 31, 2016. However, the investment in this entity was accounted for using equity method as the ownership and related contracts meet the definition of joint arrangement under IFRS 11 Joint Arrangements. As of December 31, 2017 the entity has been excluded from the range of associates as liquidated.

[21] As a general partner of Woori Columbus 1st Private Equity Fund, the Group had significant influence over the entity’s operational and financial policy making process, including participating in making decision of dividend or other distribution. As such, the investment in this entity was accounted for using equity method as of December 31, 2016. The Woori Columbus 1st Private Equity Fund has been removed from the list of associated companies as it was liquidated during the current period.

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Investment In Joint Ventures And Associates Changes in the carrying value of investments in joint ventures and associates accounted for using the equity method of accounting (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		₩ 439,012		₩ 643,861		₩ 648,436
Acquisition cost		592,148		780,911		714,904
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		13,389		3,857		(13,812)
Acquisition		192,760		48,702		84,100	[1]
Disposal and others		(70,946)	[2]	(236,654)	[3]	(58,234)
Dividends		(60,621)		(14,213)		(18,774)
Change in capital		6,663		(5,368)		4,604
Impairment		(114,903)		(1,173)		(56,311)
Others		11,697	[4]			53,852
Ending		417,051		439,012		643,861
Woori Blackstone Korea Opportunity No.1 Private Equity Fund
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		15,289		56,044		100,436
Acquisition cost				43,917		81,608
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(4,617)		10,093		9,266
Disposal and others		(7,369)	[2]	(37,036)	[3]	(37,367)
Dividends		(3,303)		(13,812)		(16,291)
Ending				15,289		56,044
Kumho Tire Co Inc
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		200,332		214,051		224,829
Acquisition cost		175,652		175,652		175,652
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(102)		(13,172)		(11,979)
Change in capital		1,545		(546)		1,201
Impairment		(102,842)
Ending		98,933		200,332		214,051
Woori Service Networks Co Ltd
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		145		139		130
Acquisition cost		108		108		108
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		21		18		21
Dividends		(8)		(12)		(12)
Ending		158		145		139
Korea Credit Bureau Co Ltd
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		5,592		5,291		3,378
Acquisition cost		3,313		3,313		2,215
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		371		436		335
Acquisition	[1]					1,098
Dividends		(147)		(135)
Change in capital						480
Ending		5,816		5,592		5,291
Korea Finance Security Co Ltd
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		3,376		3,711		4,272
Acquisition cost		3,266		3,266		3,337
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		197		(281)		(425)
Disposal and others						(81)
Dividends		(54)		(54)		(55)
Ending		3,519		3,376		3,711
United PF First corporate financial stability
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning				187,592		203,418
Acquisition cost				172,441		191,617
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)				3,265		3,350
Disposal and others				(190,857)	[3]	(19,176)
Ending						187,592
Chin Hung International Inc
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		43,032		43,935		28,491
Acquisition cost		89,725		89,725		60,275
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(14,375)		(996)		(14,489)
Acquisition		41,053	[4]			29,451	[1]
Change in capital		1,535		92		482
Others	[4]	(26,144)
Ending		45,101		43,032		43,935
Poonglim Industrial Co Ltd
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning				5,313
Acquisition cost		13,916		13,916		13,917
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(6,733)		(2,378)		10,643
Change in capital				(2,935)		(1)
Impairment						(22,472)
Others		6,733	[4]			17,143
Ending						5,313
STX Engine Co Ltd
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		43,036		51,276		2,293
Acquisition cost		92,038		92,038		47,008
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(1,010)		(6,665)		(3,901)
Acquisition	[1]					45,030
Disposal and others	[2]	(46,217)
Change in capital		4,191		(1,575)		1,823
Others						6,031
Ending				43,036		51,276
Samho Co Ltd
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		19,729		14,325		11,257
Acquisition cost		7,492		7,492		7,492
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		2,021		5,392		3,012
Disposal and others	[2]	(16,354)
Change in capital		(73)		12		56
Impairment		(5,323)
Ending				19,729		14,325
STX Corporation
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning				4,251		14,347
Acquisition cost		42,215		42,215		42,215
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(29,788)		(4,222)		(10,673)
Acquisition	[4]	8,546
Change in capital		417		(29)		559
Others		27,772	[4]			18
Ending		6,947				4,251
Osung LST Co Ltd
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning				10,985		18,482
Acquisition cost				15,405		15,405
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)				(2,903)		(4,322)
Disposal and others	[3]			(6,909)
Change in capital						4
Impairment				(1,173)		(33,839)
Others						30,660
Ending						10,985
Saman Corporation
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		8,699		8,521
Acquisition cost		8,521		8,521		8,521
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(733)		252
Acquisition	[1]					8,521
Change in capital		26		(74)
Impairment		(6,738)
Ending		1,254		8,699		8,521
K-Growth crowd 2step fund
Disclosure of changes in investments in associates and joint ventures [Line Items]
Acquisition cost				800
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)				(13)
Acquisition	[5]			800
Disposal and others	[3]			(787)
Woori Growth Partnerships New Technology Private Equity Fund
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		13,118
Acquisition cost		13,602		13,602
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(582)		(640)
Acquisition		15,729	[4]	13,602	[5]
Disposal and others	[2]	(498)
Change in capital		(156)		156
Ending		27,611		13,118
2016KIF-IMM Woori Bank Technology Venture Fund
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		1,800
Acquisition cost		1,800		1,800
Changes in investments in associates and joint ventures [Abstract]
Acquisition		5,040	[4]	1,800	[5]
Ending		6,840		1,800
K BANK Co Ltd
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		30,442
Acquisition cost		32,500		32,500
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(11,381)		(1,589)
Acquisition		12,892	[4]	32,500
Change in capital		(245)		(469)
Others	[4]	27
Ending		31,735		30,442
Smart Private Equity Fund No.2
Disclosure of changes in investments in associates and joint ventures [Line Items]
Acquisition cost		3,000
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(68)
Acquisition	[4]	3,000
Ending		2,932
Woori Bank-Company K Korea Movie Asset Fund
Disclosure of changes in investments in associates and joint ventures [Line Items]
Acquisition cost		1,500
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(43)
Acquisition	[4]	3,000
Ending		2,957
Well to Sea No.3 Private Equity Fund
Disclosure of changes in investments in associates and joint ventures [Line Items]
Acquisition cost		102,500
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		80,894
Acquisition	[4]	102,500
Disposal and others	[2]	(508)
Change in capital		(577)
Ending		182,309
Woori Renaissance Holdings
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning		54,422		37,121		36,019
Acquisition cost				63,000		63,000
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(622)		17,303		3,518
Dividends		(57,109)		(2)		(2,416)
Others	[4]	3,309
Ending				54,422		37,121
Woori Columbus First Private Equity Fund
Disclosure of changes in investments in associates and joint ventures [Line Items]
Beginning				1,306		1,084
Acquisition cost				1,200		1,200
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)				(43)		222
Disposal and others	[3]			(1,065)
Dividends				₩ (198)
Ending						1,306
Nomura-Rifa Private Real Estate Investment Trust No.17
Disclosure of changes in investments in associates and joint ventures [Line Items]
Acquisition cost		1,000
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)		(61)
Acquisition	[4]	1,000
Ending		₩ 939
Phoenix Digital Tech Co Ltd
Disclosure of changes in investments in associates and joint ventures [Line Items]
Acquisition cost						1,334
Changes in investments in associates and joint ventures [Abstract]
Share of profits(losses)						1,610
Disposal and others						₩ (1,610)

[1] Investments in associates increased by 83,002 million Won due to transfers between accounts, such as loan-equity swap occurred during the year ended December 31, 2015

[2] The Investments in Associates reclassified as assets held for sale amount to 62,571 million Won, of which 16,354 million Won was disposed of during the year ended December 31, 2017.

[3] The transfers from investments in associates to AFS financial assets amounted to 155,220 million Won and the transfers from investments in associates to assets held for sale amounted to 6,909 million Won during the year ended December 31, 2016.

[4] Changes in investments in joint ventures and associates due to debt-equity swap is 51,227 million Won during the year ended December 31, 2017.

[5] AFS financial assets decreased by 5,421 million Won due to transfers to investments in associates during the year ended December 31, 2016.

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Investment In Joint Ventures And Associates_Financial information relating to investments in joint ventures and associates accounted for using the equity method of accounting (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Woori Blackstone Korea Opportunity No.1 Private Equity Fund
Equity method investment summarized financial information [Line Items]
Assets		₩ 57,971
Liabilities		427
Operating revenue		75,084
Net income(loss)		38,226
Kumho Tire Co Inc
Equity method investment summarized financial information [Line Items]
Assets	₩ 5,105,107	5,079,740
Liabilities	3,928,327	3,914,306
Operating revenue	2,136,569	2,156,667
Net income(loss)	(61,748)	(53,328)
Woori Service Networks Co Ltd
Equity method investment summarized financial information [Line Items]
Assets	4,982	4,722
Liabilities	1,780	1,782
Operating revenue	14,887	14,875
Net income(loss)	1,003	801
Korea Credit Bureau Co Ltd
Equity method investment summarized financial information [Line Items]
Assets	75,504	71,245
Liabilities	19,323	17,322
Operating revenue	68,750	59,868
Net income(loss)	3,580	3,517
Korea Finance Security Co Ltd
Equity method investment summarized financial information [Line Items]
Assets	33,915	32,262
Liabilities	10,461	9,759
Operating revenue	55,610	52,657
Net income(loss)	1,071	700
Chin Hung International Inc
Equity method investment summarized financial information [Line Items]
Assets	341,284	421,710
Liabilities	259,454	354,995
Operating revenue	513,285	578,640
Net income(loss)	28,698	794
Poonglim Industrial Co Ltd
Equity method investment summarized financial information [Line Items]
Assets	241,063	304,718
Liabilities	309,925	323,765
Operating revenue	107,360	156,770
Net income(loss)	(29,812)	(15,135)
STX Engine Co Ltd
Equity method investment summarized financial information [Line Items]
Assets		865,265
Liabilities		769,481
Operating revenue		372,295
Net income(loss)		(22,978)
Samho Co Ltd
Equity method investment summarized financial information [Line Items]
Assets		740,786
Liabilities		489,130
Operating revenue		909,927
Net income(loss)		68,077
STX Corporation
Equity method investment summarized financial information [Line Items]
Assets	595,348	781,622
Liabilities	543,458	1,087,469
Operating revenue	1,371,272	1,252,968
Net income(loss)	342,869	(378,782)
Saman Corporation
Equity method investment summarized financial information [Line Items]
Assets	98,435	83,380
Liabilities	69,929	47,175
Operating revenue	76,135	72,850
Net income(loss)	(6,096)	2,746
Woori Growth Partnerships New Technology Private Equity Fund
Equity method investment summarized financial information [Line Items]
Assets	120,133	57,339
Liabilities	485	493
Operating revenue	1,024	37
Net income(loss)	(3,199)	(2,177)
2016KIF-IMM Woori Bank Technology Venture Fund
Equity method investment summarized financial information [Line Items]
Assets	32,815	9,005
Liabilities	380	254
Operating revenue	6	5
Net income(loss)	(1,515)	(250)
K BANK Co Ltd
Equity method investment summarized financial information [Line Items]
Assets	1,244,270	239,806
Liabilities	1,001,121	5,633
Operating revenue	19,231	2,927
Net income(loss)	(74,403)	(12,222)
Woori Renaissance Holdings Inc
Equity method investment summarized financial information [Line Items]
Assets		127,411
Liabilities		26,703
Operating revenue		37,206
Net income(loss)		33,508
Woori Columbus First Private Equity Fund
Equity method investment summarized financial information [Line Items]
Assets		811
Liabilities		506
Operating revenue		3,764
Net income(loss)		₩ (450)
Smart Private Equity Fund No.2
Equity method investment summarized financial information [Line Items]
Assets	14,711
Liabilities	51
Operating revenue	1
Net income(loss)	(340)
Woori Bank-Company K Korea Movie Asset Fund
Equity method investment summarized financial information [Line Items]
Assets	11,830
Liabilities	2
Operating revenue	16
Net income(loss)	(172)
Well to Sea No.3 Private Equity Fund
Equity method investment summarized financial information [Line Items]
Assets	5,068,424
Liabilities	4,534,957
Operating revenue	131,488
Net income(loss)	162,743
Nomura-Rifa Private Real Estate Investment Trust No.17
Equity method investment summarized financial information [Line Items]
Assets	20,265
Liabilities	16,507
Operating revenue	62
Net income(loss)	₩ (242)

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Investment In Joint Ventures And Associates Entities not applied for equity method of accounting with ownership ratio exceeding twenty percent (Details) - shares		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Description of reasons why presumption that interest of more than twenty per cent in associate is overcome		Even though the Group’s ownership interest of the entity is more than 20%, the Group does not have significant influence over the entity since it is going through work-out process under receivership, thus it is excluded from the investment in associates.	Even though the Group’s ownership interest of the entity is more than 20%, the Group does not have significant influence over the entity since it is going through work-out process under receivership, thus it is excluded from the investment in associates.
Orient Shipyard Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		465,050	465,050
Ownership	[1]	21.40%	23.00%
Saenuel Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		3,531	3,531
Ownership	[1]	37.40%	37.40%
E mirae Tech Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		7,696	7,696
Ownership	[1]	41.00%	41.00%
Jehin Trading Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		81,610	81,610
Ownership	[1]	27.30%	27.30%
Nk Eng Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned			697,033
Ownership	[1]		23.10%
Description of reasons why presumption that interest of more than twenty per cent in associate is overcome		(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.
The season Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		18,187	18,187
Ownership	[1]	30.10%	30.10%
Yuil PESC Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		8,642	8,642
Ownership	[1]	24.00%	24.00%
Youngdong Sea Food Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		12,106	12,106
Ownership	[1]	24.00%	24.00%
Sinseong Trading Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		2,584	2,584
Ownership	[1]	27.20%	27.20%
Reading Doctors Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned			7,398
Ownership	[1]		35.40%
Description of reasons why presumption that interest of more than twenty per cent in associate is overcome		(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.
PREXCO Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned			919,972
Ownership	[1]		28.10%
Description of reasons why presumption that interest of more than twenty per cent in associate is overcome		(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.
Hyunwoo International Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned			59,873
Ownership	[1]		25.90%
Description of reasons why presumption that interest of more than twenty per cent in associate is overcome		(*10) Even though the Group’s ownership ratio of the entity was more than 20% as of December 31, 2016, the Group did not have significant influence over the entity due to the fact that the entity was going through workout process under receivership, and thus the entity was excluded from the investment in associates. However, as the workout process was completed during the years ended December 31, 2017, it has been included in the investment in associates.
CL Tech Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		13,759
Ownership	[1]	38.60%
Force TEC Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		4,780,907
Ownership	[1]	25.80%
Protronics Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		95,921
Ownership	[1]	48.10%
Instern Co Ltd
Disclosure of entities not applied for equity method of accounting with ownership ratio exceeding twenty percent [Line Items]
Number of shares owned		14,296
Ownership	[1]	20.10%

[1] Even though the Group’s ownership interest of the entity is more than 20%, the Group does not have significant influence over the entity since it is going through work-out process under receivership, thus it is excluded from the investment in associates.

XML

Investment In Joint Ventures And Associates Reconciliations from the net assets of associates based on the ownership ratio to corresponding book value of investment in joint ventures and associates (Details)] - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Book value		₩ 417,051		₩ 439,012		₩ 643,861		₩ 648,436
Woori Blackstone Korea Opportunity Private Equity Fund No.1
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset				₩ 57,544		₩ 211,757
Ownership				26.40%	[1]	26.40%
Net assets of associates(or joint ventures)				₩ 15,191		₩ 55,900
Intercompany transaction and others				98		144
Book value				15,289		56,044		100,436
Kumho Tire Co Inc
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ 1,065,421	[2]	₩ 1,055,219	[3]	₩ 1,152,161	[3]
Ownership		14.20%	[4],[5]	14.20%	[4],[5]	14.20%
Net assets of associates(or joint ventures)		₩ 150,767		₩ 149,324		₩ 163,042
Cost-book value differential	[6]	48,459		48,459		48,459
Impairment	[7]	(102,843)
Intercompany transaction and others		2,550		2,549		2,549
Book value		98,933		200,332		214,051		224,829
Woori Service Networks Co Ltd
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ 3,202	[2]	₩ 2,940		₩ 2,805
Ownership		4.90%	[8]	4.90%	[8]	4.90%
Net assets of associates(or joint ventures)		₩ 158		₩ 145		₩ 139
Book value		158		145		139		130
Korea Credit Bureau Co Ltd
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ 56,181	[2]	₩ 53,923		₩ 50,884
Ownership		9.90%	[9]	9.90%	[9]	9.90%
Net assets of associates(or joint ventures)		₩ 5,568		₩ 5,344		₩ 5,043
Cost-book value differential	[6]	248		248		248
Book value		5,816		5,592		5,291		3,378
Korea Finance Security Co Ltd
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ 23,454	[2]	₩ 22,503		₩ 24,738
Ownership		15.00%	[8]	15.00%	[8]	15.00%
Net assets of associates(or joint ventures)		₩ 3,519		₩ 3,376		₩ 3,711
Book value		3,519		3,376		3,711		4,272
United PF First corporate financial stability
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset						₩ 1,057,935
Ownership						17.70%
Net assets of associates(or joint ventures)						₩ 187,538
Intercompany transaction and others						54
Book value						187,592		203,418
Chin Hung International Inc
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ 81,686	[2]	₩ 65,387	[3]	₩ 68,132	[3]
Ownership		25.30%	[5],[10]	28.40%	[5],[10]	28.40%
Net assets of associates(or joint ventures)		₩ 20,671		₩ 18,593		₩ 19,374
Cost-book value differential	[6]	24,565		24,565		24,566
Intercompany transaction and others		(135)		(126)		(4)
Book value		45,101		43,032		43,935		28,491
Poonglim Industrial Co Ltd
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ (168,154)	[2]	₩ (111,156)	[3]	₩ (58,065)	[3]
Ownership		29.40%	[11],[12],[13]	31.00%	[11],[12],[13]	30.70%
Net assets of associates(or joint ventures)		₩ (49,446)		₩ (34,463)		₩ (17,837)
Cost-book value differential	[6]	54,542		54,149		45,622
Impairment		(20,504)		(21,062)		(22,472)
Intercompany transaction and others		₩ 15,408		1,376
Book value						5,313
STX Engine Co Ltd
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset	[3]			₩ 95,784		₩ 123,969
Ownership		29.20%	[4],[5],[14]	29.20%	[4],[5]	29.20%
Net assets of associates(or joint ventures)				₩ 28,002		₩ 36,230
Cost-book value differential	[6]			14,954		14,927
Intercompany transaction and others				80		119
Book value				43,036		51,276		2,293
Samho Co Ltd
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset				₩ 251,656		₩ 182,730
Ownership				7.80%	[5],[15]	7.80%
Net assets of associates(or joint ventures)				₩ 19,729		₩ 14,325
Book value				19,729		14,325		11,257
STX Corporation
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ 51,890	[2]	₩ (250,018)		₩ 50,421
Ownership		19.70%	[4],[5],[16]	9.50%	[4],[5],[13]	15.00%
Net assets of associates(or joint ventures)		₩ 10,232		₩ (23,633)		₩ 7,552
Cost-book value differential		24,614	[6]	24,614	[6]	24,610
Impairment		(27,904)		(27,904)		(28,370)
Intercompany transaction and others		5		26,923		459
Book value		6,947				4,251		14,347
Osung LST Co Ltd
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset						₩ 82,878
Ownership						11.10%
Net assets of associates(or joint ventures)						₩ 9,238
Cost-book value differential						35,597
Impairment						(33,839)
Intercompany transaction and others						(11)
Book value						10,985		18,482
Saman Corporation
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ 28,506	[2]	₩ 36,205		₩ 31,636
Ownership		9.20%	[9]	9.20%	[9]	9.20%
Net assets of associates(or joint ventures)		₩ 2,619		₩ 3,326		₩ 2,911
Cost-book value differential	[6]	5,373		5,373		5,610
Impairment		(6,738)
Book value		1,254		8,699		8,521
Woori Growth Partnerships New Technology Private Equity Fund
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ 119,648	[2]	₩ 56,846
Ownership		23.10%		23.10%
Net assets of associates(or joint ventures)		₩ 27,611		₩ 13,118
Book value		27,611		13,118
2016KIF-IMM Woori Bank Technology Venture Fund
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ 32,435	[2]	₩ 8,751
Ownership		20.00%		20.00%
Net assets of associates(or joint ventures)		₩ 6,487		₩ 1,750
Intercompany transaction and others		353		50
Book value		6,840		1,800
K BANK Co Ltd
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset		₩ 243,149	[2]	₩ 234,173
Ownership	[9]	13.80%		13.00%
Net assets of associates(or joint ventures)		₩ 31,535		₩ 30,442
Intercompany transaction and others		200
Book value		31,735		30,442
Woori Renaissance Holdings Inc
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset				₩ 100,708		₩ 67,203
Ownership				51.60%	[17]	51.60%
Net assets of associates(or joint ventures)				₩ 51,965		₩ 34,677
Impairment				(6,441)		(6,441)
Intercompany transaction and others				8,898		8,885
Book value				54,422		37,121		36,019
Woori Columbus First Private Equity Fund
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset				₩ 305		₩ 67,904
Ownership				0.20%	[18]	1.90%
Net assets of associates(or joint ventures)				₩ 6		₩ 1,304
Cost-book value differential	[6]					6
Intercompany transaction and others				₩ (6)		(4)
Book value						₩ 1,306		₩ 1,084
Smart Private Equity Fund No.2
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset	[2]	₩ 14,660
Ownership	[19]	20.00%
Net assets of associates(or joint ventures)		₩ 2,932
Book value		2,932
Woori Bank-Company K Korea Movie Asset Fund
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset	[2]	₩ 11,828
Ownership	[19]	25.00%
Net assets of associates(or joint ventures)		₩ 2,957
Book value		2,957
Well to Sea No.3 Private Equity Fund
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset	[2]	₩ 364,909
Ownership	[19]	50.00%
Net assets of associates(or joint ventures)		₩ 182,366
Intercompany transaction and others		(57)
Book value		182,309
Nomura-Rifa Private Real Estate Investment Trust No.17
Reconciliations from the net assets of associates and joint ventures based on the ownership ratio to corresponding book value of investment in associates and joint ventures [Line Items]
Total net asset	[2]	₩ 3,758
Ownership	[19]	25.00%
Net assets of associates(or joint ventures)		₩ 939
Book value		₩ 939

[1] It has been removed from the list of associated companies as it was liquidated during the current period.

[2] The net asset amount is after reflecting debt-equity swap and others

[3] The net asset amount is after considering preferred stocks and others.

[4] The Group has significant influence on these entities through its position in the creditors' council which is the decision making body regarding to financial and operational policies of associates.

[5] The investments in associates that have quoted market prices are Kumho Tire Co., Ltd. (current period: 4,425 Korean Won, previous year: 8,480 Korean Won), Chin Hung International Inc. (current period: 1,915 Korean Won, previous year: 2,090 Korean Won), STX Engine Co., Ltd. (current period: 9,150 Korean Won, previous year: 6,630 Korean Won), Samho International Co., Ltd. (previous year: 16,900 Korean Won), STX Corporation. (previous year: 1,660 Korean Won).

[6] It is attributed as the difference between the acquisition cost and the corresponding net asset when the Group acquired the associates.

[7] The Group recognized 102,843 million of impairment loss on the investment due to a significant and prolonged decline in the stock price of the investment below its book value.

[8] Most of the significant business transactions of associates are with the Group as of December 31, 2016 and 2017.

[9] The Group can participate in decision-making body and exercise significant influence over associates through business partnerships.

[10] Due to consolidation of stocks and debt-equity swap, the Group’s number of holding shares and ownership ratio have decreased.

[11] As the carrying amounts of certain investments in associates had been reduced to zero, the Group discontinued the use of the equity method in accounting for those investments, and unrecognized losses due to the restricted application of equity method amount to 612 million Won and 16,344 million Won as of December 31, 2016 and 2017, respectively.

[12] The Group has sold a part of shares of the associates so the number of shares holding has decreased during the years ended December 31, 2017.

[13] The carrying values of investments in Force TEC Co., Ltd., STX Corporation and Deokwon Food Co., Ltd. are nil as of December 31, 2016 and those of investments in Reading Doctors Co., Ltd., PREXCO Co., Ltd., Hyunwoo International Co., Ltd., Jiwon Plating Co., Ltd., Cultizm Korea LTD Co., Ltd., Gil Co., Ltd. and NK Eng Co., Ltd. are nil as of December 31, 2017. Furthermore, those of investments in Poonglim Industrial Co., Ltd., Dongwoo C&C Co., Ltd., SJCO Co., Ltd., G2 collection Co., Ltd., The Base Enterprise Co., Ltd., Heungjiwon Co., Ltd., Kyesan Engineering Co., Ltd., Good Software Lab Co., Ltd., Wongwang Co., Ltd., Sejin Construction Co., Ltd., QTS Shipping Co., Ltd., DAEA SNC Co., Ltd. and ARES-TECH Co., Ltd. are nil as of both December 31, 2016 and 2017.

[14] The shares of STX Engine Co., Ltd. owned by the Group were reclassified as assets held for sale, as the creditor financial institutions committee entered into a contract with UAMCO.,Ltd during the current period to sell STX Engine Co., Ltd. shares.

[15] The entity was sold after it was transferred to assets held for sale and was excluded from the investment in associates.

[16] Due to debt-equity swap capital stock, the Group ownership ratio has increased during the years ended December 31, 2017.

[17] The Group owns over 50% ownership as of December 31, 2016. However, the investment in this entity was accounted for using equity method as the ownership and related contracts meet the definition of joint arrangement under IFRS 11 Joint Arrangements. As of December 31, 2017 the entity has been excluded from the range of associates as liquidated.

[18] As a general partner of Woori Columbus 1st Private Equity Fund, the Group had significant influence over the entity’s operational and financial policy making process, including participating in making decision of dividend or other distribution. As such, the investment in this entity was accounted for using equity method as of December 31, 2016. The Woori Columbus 1st Private Equity Fund has been removed from the list of associated companies as it was liquidated during the current period.

[19] Due to capital contribution by the Group during the years ended December 31, 2017, the entities were included in the investment in associates.

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Investment Properties Details of investment properties (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)	Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Disclosure of investment property [Line Items]
Net carrying value	₩ 371,301	$ 347,849	₩ 358,497	₩ 351,496	₩ 371,301	₩ 358,497	₩ 351,496
Reconciliation of changes in investment property [Abstract]
Beginning balance	358,497		351,496	357,550
Changes in investment property [Abstract]
Acquisition	9,872		4,428
Disposal	(458)
Depreciation	(3,902)		(3,762)	(3,806)
Transfer					2,472	6,314	₩ (2,297)
Classified to assets held for sale	(371)
Foreign currencies translation adjustments	(324)		21	49
Others	5,515
Ending balance	₩ 371,301	$ 347,849	₩ 358,497	₩ 351,496
Fair value of investment properties					396,587	382,370
Description of extent to which fair value of investment property is based on valuation by independent value	The fair value of investment property, based on the assessment that was independently performed by external appraisal agencies	The fair value of investment property, based on the assessment that was independently performed by external appraisal agencies	The fair value of investment property, based on the assessment that was independently performed by external appraisal agencies
Description of investment property of level of fair value hierarchy within which fair value measurement is categorised	The fair value of investment property is classified as level 3 on the fair value hierarchy	The fair value of investment property is classified as level 3 on the fair value hierarchy	The fair value of investment property is classified as level 3 on the fair value hierarchy
Acquisition cost
Disclosure of investment property [Line Items]
Net carrying value	₩ 404,741		₩ 387,675		404,741	387,675
Reconciliation of changes in investment property [Abstract]
Beginning balance	387,675
Changes in investment property [Abstract]
Ending balance	404,741		387,675
Accumulated depreciation
Disclosure of investment property [Line Items]
Net carrying value	(33,440)		(29,178)		₩ (33,440)	₩ (29,178)
Reconciliation of changes in investment property [Abstract]
Beginning balance	(29,178)
Changes in investment property [Abstract]
Ending balance	₩ (33,440)		₩ (29,178)

XML

Investment Properties Rental fee earned from investment properties (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Rental income from investment property net of direct operating expense [Abstract]
Rental fee earned from investment properties	₩ 4,579	₩ 5,027	₩ 5,629

XML

Premises And Equipment Details of premises and equipment (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)	Dec. 31, 2017 USD ($)
Disclosure of property plant and equipment [Line Items]
Net carrying value	₩ 2,477,545	₩ 2,458,025	₩ 2,501,102	$ 2,321,059
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	2,458,025	2,471,206	2,501,102
Changes in property plant and equipment [Abstract]
Acquisition	162,245	131,121	129,046
Disposal	(6,106)	(4,462)	(14,588)
Depreciation	(132,108)	(155,919)	(146,866)
Classified to assets held for sale	(3,203)	(4,314)	(13,457)
Transfer	(2,472)	(6,059)	2,297
Foreign currencies translation adjustment	(6,626)	1,977	100
Acquisition through business combination		651
Others	7,790	23,824	13,572
Ending balance	2,477,545	2,458,025	2,471,206
Acquisition cost
Disclosure of property plant and equipment [Line Items]
Net carrying value	3,797,517	3,797,517
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	3,797,517
Changes in property plant and equipment [Abstract]
Ending balance	3,873,512	3,797,517
Accumulated depreciation
Disclosure of property plant and equipment [Line Items]
Net carrying value	(1,339,492)	(1,339,492)
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	(1,339,492)
Changes in property plant and equipment [Abstract]
Ending balance	(1,395,967)	(1,339,492)
Land
Disclosure of property plant and equipment [Line Items]
Net carrying value	1,488,745	1,493,628	1,514,698
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	1,488,745	1,493,628	1,514,698
Changes in property plant and equipment [Abstract]
Acquisition	4,755		2,628
Disposal	(1,840)	(30)	(10,780)
Classified to assets held for sale	(2,693)	(4,063)	(5,109)
Transfer	(196)	(1,415)	(7,481)
Foreign currencies translation adjustment	(1,493)	625	(328)
Ending balance	1,487,278	1,488,745	1,493,628
Land | Acquisition cost
Disclosure of property plant and equipment [Line Items]
Net carrying value	1,488,745	1,488,745
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	1,488,745
Changes in property plant and equipment [Abstract]
Ending balance	1,487,278	1,488,745
Building
Disclosure of property plant and equipment [Line Items]
Net carrying value	691,699	704,017	706,524
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	691,699	704,017	706,524
Changes in property plant and equipment [Abstract]
Acquisition	22,579	15,939	21,127
Disposal	(2,593)	(1,474)	(648)
Depreciation	(26,156)	(24,887)	(24,846)
Classified to assets held for sale	(1,059)	(251)	(8,348)
Transfer	(2,134)	(1,557)	9,778
Foreign currencies translation adjustment	(1,393)	516	(333)
Others	(97)	(604)	763
Ending balance	680,846	691,699	704,017
Building | Acquisition cost
Disclosure of property plant and equipment [Line Items]
Net carrying value	855,332	855,332
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	855,332
Changes in property plant and equipment [Abstract]
Ending balance	867,804	855,332
Building | Accumulated depreciation
Disclosure of property plant and equipment [Line Items]
Net carrying value	(163,633)	(163,633)
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	(163,633)
Changes in property plant and equipment [Abstract]
Ending balance	(186,958)	(163,633)
Properties for business use
Disclosure of property plant and equipment [Line Items]
Net carrying value	189,902	193,291	209,588
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	189,902	193,291	209,588
Changes in property plant and equipment [Abstract]
Acquisition	59,694	74,336	69,230
Disposal	(442)	(233)	(847)
Depreciation	(74,223)	(82,445)	(85,279)
Classified to assets held for sale	549
Transfer	5,411
Foreign currencies translation adjustment	(2,023)	307	265
Acquisition through business combination		209
Others	1,204	4,437	334
Ending balance	180,072	189,902	193,291
Properties for business use | Acquisition cost
Disclosure of property plant and equipment [Line Items]
Net carrying value	1,010,141	1,010,141
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	1,010,141
Changes in property plant and equipment [Abstract]
Ending balance	1,024,186	1,010,141
Properties for business use | Accumulated depreciation
Disclosure of property plant and equipment [Line Items]
Net carrying value	(820,239)	(820,239)
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	(820,239)
Changes in property plant and equipment [Abstract]
Ending balance	(844,114)	(820,239)
Structures in leased office
Disclosure of property plant and equipment [Line Items]
Net carrying value	68,958	79,744	70,185
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	68,958	79,744	70,185
Changes in property plant and equipment [Abstract]
Acquisition	23,420	19,615	35,304
Disposal	(1,231)	(2,623)	(2,000)
Depreciation	(31,728)	(48,587)	(36,740)
Foreign currencies translation adjustment	(1,315)	376	515
Acquisition through business combination		442
Others	6,683	19,991	12,480
Ending balance	64,787	68,958	79,744
Structures in leased office | Acquisition cost
Disclosure of property plant and equipment [Line Items]
Net carrying value	424,562	424,562
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	424,562
Changes in property plant and equipment [Abstract]
Ending balance	429,665	424,562
Structures in leased office | Accumulated depreciation
Disclosure of property plant and equipment [Line Items]
Net carrying value	(355,604)	(355,604)
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	(355,604)
Changes in property plant and equipment [Abstract]
Ending balance	(364,878)	(355,604)
Construction in progress
Disclosure of property plant and equipment [Line Items]
Net carrying value	18,717	522	102
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	18,717	522	102
Changes in property plant and equipment [Abstract]
Acquisition	51,797	21,231	757
Disposal		(102)	(313)
Transfer	(5,553)	(3,087)
Foreign currencies translation adjustment	(402)	153	(19)
Others			(5)
Ending balance	64,559	18,717	522
Construction in progress | Acquisition cost
Disclosure of property plant and equipment [Line Items]
Net carrying value	18,717	18,717
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	18,717
Changes in property plant and equipment [Abstract]
Ending balance	64,559	18,717
Structures
Disclosure of property plant and equipment [Line Items]
Net carrying value	4	4	5
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	4	4	5
Changes in property plant and equipment [Abstract]
Depreciation	(1)		(1)
Ending balance	3	4	₩ 4
Structures | Acquisition cost
Disclosure of property plant and equipment [Line Items]
Net carrying value	20	20
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	20
Changes in property plant and equipment [Abstract]
Ending balance	20	20
Structures | Accumulated depreciation
Disclosure of property plant and equipment [Line Items]
Net carrying value	(16)	(16)
Reconciliation of changes in property plant and equipment [Abstract]
Beginning balance	(16)
Changes in property plant and equipment [Abstract]
Ending balance	₩ (17)	₩ (16)

XML

Intangible Assets And Goodwill Details of intangible assets (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)	Dec. 31, 2017 USD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	₩ 518,599	₩ 483,739	₩ 419,806	$ 485,844
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	483,739	419,806	295,728
Changes in intangible assets and goodwill [Abstract]
Acquisition	157,423	134,889	222,843
Disposal	(981)	(3,808)	(1,701)
Amortization	(99,784)	(92,350)	(90,092)
Impairment losses	(237)	1,645	(1,920)
Foreign currencies translation adjustment	(20,538)	8,257	(4,341)
Others	(1,023)	7,238	(711)
Acquisition through business combination		8,062
Ending balance	518,599	483,739	419,806
Acquisition cost
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	1,259,174	1,259,174
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	1,259,174
Changes in intangible assets and goodwill [Abstract]
Ending balance	1,387,971	1,259,174
Accumulated amortization
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	(768,549)	(768,549)
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	(768,549)
Changes in intangible assets and goodwill [Abstract]
Ending balance	(862,583)	(768,549)
Accumulated impairment losses
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	(6,886)	(6,886)
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	(6,886)
Changes in intangible assets and goodwill [Abstract]
Ending balance	(6,789)	(6,886)
Goodwill
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	108,707	103,525	103,525
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	124,803	103,525	107,541
Changes in intangible assets and goodwill [Abstract]
Acquisition	105
Foreign currencies translation adjustment	(16,201)	7,338	(4,016)
Others		6,083
Acquisition through business combination		7,857
Ending balance	108,707	124,803	103,525
Goodwill | Acquisition cost
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	124,803	124,803
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	124,803
Changes in intangible assets and goodwill [Abstract]
Ending balance	108,707	124,803
Software
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	40,672	38,171	38,171
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	35,477	38,171	47,821
Changes in intangible assets and goodwill [Abstract]
Acquisition	9,722	8,708	7,347
Disposal			(189)
Amortization	(16,258)	(15,795)	(16,809)
Transfer	7,987
Foreign currencies translation adjustment	(952)	16	1
Others	4,696	4,215
Acquisition through business combination		162
Ending balance	40,672	35,477	38,171
Software | Acquisition cost
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	185,202	185,202
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	185,202
Changes in intangible assets and goodwill [Abstract]
Ending balance	203,418	185,202
Software | Accumulated amortization
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	(149,725)	(149,725)
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	(149,725)
Changes in intangible assets and goodwill [Abstract]
Ending balance	(162,746)	(149,725)
Industrial property rights
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	539	344	344
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	313	344	328
Changes in intangible assets and goodwill [Abstract]
Acquisition	349	64	96
Amortization	(123)	(95)	(81)
Foreign currencies translation adjustment			1
Ending balance	539	313	344
Industrial property rights | Acquisition cost
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	714	714
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	714
Changes in intangible assets and goodwill [Abstract]
Ending balance	1,063	714
Industrial property rights | Accumulated amortization
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	(401)	(401)
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	(401)
Changes in intangible assets and goodwill [Abstract]
Ending balance	(524)	(401)
Development costs
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	230,450	51,357	51,357
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	138,696	51,357	55,337
Changes in intangible assets and goodwill [Abstract]
Acquisition	122,849	92,969	16,751
Disposal			(1,500)
Amortization	(22,534)	(18,657)	(19,233)
Transfer	(7,987)
Foreign currencies translation adjustment	(483)		2
Others	(91)	13,027
Ending balance	230,450	138,696	51,357
Development costs | Acquisition cost
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	299,031	299,031
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	299,031
Changes in intangible assets and goodwill [Abstract]
Ending balance	413,296	299,031
Development costs | Accumulated amortization
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	(160,335)	(160,335)
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	(160,335)
Changes in intangible assets and goodwill [Abstract]
Ending balance	(182,846)	(160,335)
Others
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	117,546	201,769	201,769
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	164,364	201,769	60,807
Changes in intangible assets and goodwill [Abstract]
Acquisition	22,531	30,842	196,139
Disposal	(37)	(23)	(12)
Amortization	(60,869)	(57,803)	(53,969)
Impairment losses	(78)	3,230	(9)
Foreign currencies translation adjustment	(2,742)	853	(476)
Others	(5,623)	(14,504)	(711)
Ending balance	117,546	164,364	201,769
Others | Acquisition cost
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	622,540	622,540
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	622,540
Changes in intangible assets and goodwill [Abstract]
Ending balance	634,150	622,540
Others | Accumulated amortization
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	(458,088)	(458,088)
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	(458,088)
Changes in intangible assets and goodwill [Abstract]
Ending balance	(516,467)	(458,088)
Others | Accumulated impairment losses
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	(88)	(88)
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	(88)
Changes in intangible assets and goodwill [Abstract]
Ending balance	(137)	(88)
Membership deposit
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	20,685	24,640	24,640
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	20,086	24,640	23,894
Changes in intangible assets and goodwill [Abstract]
Acquisition	1,867	2,306	2,510
Disposal	(944)	(3,785)
Impairment losses	(159)	(1,585)	(1,911)
Foreign currencies translation adjustment	(160)	50	147
Others	(5)	(1,583)
Acquisition through business combination		43
Ending balance	20,685	20,086	₩ 24,640
Membership deposit | Acquisition cost
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	26,884	26,884
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	26,884
Changes in intangible assets and goodwill [Abstract]
Ending balance	27,337	26,884
Membership deposit | Accumulated impairment losses
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Net carrying value	(6,798)	(6,798)
Reconciliation of changes in intangible assets and goodwill [Abstract]
Beginning balance	(6,798)
Changes in intangible assets and goodwill [Abstract]
Ending balance	₩ (6,652)	₩ (6,798)

XML

Assets Held For Sale Details of assets held for sale (Details) $ in Thousands, ₩ in Millions		Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Noncurrent assets or disposal groups classified as held for sale [Line Items]
Total		₩ 48,624	$ 45,553	₩ 2,342
Investments in joint ventures and associates
Noncurrent assets or disposal groups classified as held for sale [Line Items]
Total	[1]	46,217
Premises and equipment
Noncurrent assets or disposal groups classified as held for sale [Line Items]
Total		₩ 2,407		₩ 2,342

[1] The shares of STX Engine Co., Ltd. owned by the Group are reclassified as assets held for sale, as the creditor financial institutions committee has entered into a contract with UAMCO., Ltd for the year ended December 31, 2017, to sell STX Engine Co., Ltd. shares.

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Assets Subject To Lien And Assets Acquired Through Foreclosures Assets subjected to lien (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Financial instruments owned and pledged as collateral [Line Items]
Amount		₩ 9,725,617	₩ 10,307,257
Due from the depository banks | KRW [Member] | Bank of China and others
Financial instruments owned and pledged as collateral [Line Items]
Amount		₩ 6,629
Nature of assets pledged as collateral description		Collaterals for issuing letter of guarantee and others
Due from the depository banks | KRW [Member] | Samsung Securities Co Ltd and others
Financial instruments owned and pledged as collateral [Line Items]
Amount		₩ 10,809	₩ 24,589
Nature of assets pledged as collateral description		Margin deposit for futures and options and others	Margin deposit for futures and options and others
Due from the depository banks | Foreign Currencies Others [Member] | Korea Investment and Securities Co Ltd and others
Financial instruments owned and pledged as collateral [Line Items]
Amount		₩ 9,136	₩ 227,249
Nature of assets pledged as collateral description		Foreign margin deposit for future or option and others	Foreign margin deposit for future or option and others
Financial institutions debt securities and others | Yuanta Securities Co Ltd and others
Financial instruments owned and pledged as collateral [Line Items]
Amount		₩ 501,523	₩ 473,476
Nature of assets pledged as collateral description		Substitute securities and others	Substitute securities and others
Korean treasury and government agencies bonds | Korea Securities Depository and others
Financial instruments owned and pledged as collateral [Line Items]
Amount		₩ 9,998	₩ 2,546,683
Nature of assets pledged as collateral description	[1]	Related to bonds sold under repurchase agreements	Related to bonds sold under repurchase agreements
Financial institutions debt securities and others | The BOK and others
Financial instruments owned and pledged as collateral [Line Items]
Amount		₩ 1,570,608	₩ 836,522
Nature of assets pledged as collateral description		Settlement risk and others	Settlement risk and others
Korean treasury and government agencies bonds | Korea Securities Depository and others
Financial instruments owned and pledged as collateral [Line Items]
Amount		₩ 5,436	₩ 7,133
Nature of assets pledged as collateral description	[1]	Related to bonds sold under repurchase agreements	Related to bonds sold under repurchase agreements
Korean treasury and government agencies bonds and others | The BOK and others
Financial instruments owned and pledged as collateral [Line Items]
Amount		₩ 7,605,292	₩ 6,185,295
Nature of assets pledged as collateral description		Settlement risk and others	Settlement risk and others
Premises and equipment | Credit Counselling & Recovery Service and others
Financial instruments owned and pledged as collateral [Line Items]
Amount		₩ 6,186	₩ 6,310
Nature of assets pledged as collateral description		Leasehold rights and others	Leasehold rights and others

[1] The Group enters into the repurchase agreements at predetermined price or original sale price added with certain rate of return after the disposal of securities. In this regards, the securities are provided as collaterals, and the purchasers are eligible to dispose or provide them as collateral. Therefore, as such securities have been transferred but have not been derecognized, the Group recognizes the relevant amount as liability (bond sold under repurchase agreements).

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Assets Subject To Lien And Assets Acquired Through Foreclosures Carrying amounts of buildings acquired through foreclosure (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclsoure of carrying amounts o assets acquired through foreclosure [Abstract]
Land	₩ 332	₩ 4,138
Buildings	44	1,852
Properties not used in business		202
Total	₩ 376	₩ 6,192

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Assets Subject To Lien And Assets Acquired Through Foreclosures Details of securities lent (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loaned securities
Disclosure of financial assets transferred during period which do not qualify for derecognition [Line Items]
Assets that entity continues to recognise	₩ 170,256	₩ 498,038
Nature of financial assets transferred during period which do not qualify for derecognition	When the Group loans its securities to outside parties, the legal ownerships of the securities are transferred, however, they should be returned at the end of lending period therefore the Group does not derecognize them from the consolidated financial statements as it owns majority of risks and benefits from the securities continuously regardless of the transfer of legal ownership.	When the Group loans its securities to outside parties, the legal ownerships of the securities are transferred, however, they should be returned at the end of lending period therefore the Group does not derecognize them from the consolidated financial statements as it owns majority of risks and benefits from the securities continuously regardless of the transfer of legal ownership.
Korean Equity securities | Samsung Securities Co Ltd and others
Disclosure of financial assets transferred during period which do not qualify for derecognition [Line Items]
Assets that entity continues to recognise		₩ 4,459
Korean treasury and government agencies bonds and others | Korea Securities Depository and others
Disclosure of financial assets transferred during period which do not qualify for derecognition [Line Items]
Assets that entity continues to recognise	₩ 170,256	₩ 493,579

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Assets Subject To Lien And Assets Acquired Through Foreclosures Collaterals held that can be disposed and recollateralized regardless of defaults of counterparties (Details) - KRW (₩)	Dec. 31, 2017	Dec. 31, 2016
Fair value of collateral available to sell or repledge and collateral sold or repledged [Line Items]
Fair values of collaterals	₩ 17,671,490,000,000	₩ 8,746,101,000,000
Fair values of collaterals were disposed or re-subjected to lien	₩ 0	₩ 0

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Other Assets Details of other assets (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Other assests [Line Items]
Total	₩ 158,404	$ 148,399	₩ 128,846
Prepaid expenses
Other assests [Line Items]
Total	130,245		111,445
Advance payments
Other assests [Line Items]
Total	18,363		1,944
Non-operative assets
Other assests [Line Items]
Total	376		6,192
Others
Other assests [Line Items]
Total	₩ 9,420		₩ 9,265

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Financial Liabilitiy At Fair Value Through Profit Or Loss Details of financial liabilities at fair value through profit or loss (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Disclosure of financial liabilities at fair value through profit or loss [Line Items]
Financial liabilities held for trading	₩ 3,176,113		₩ 3,036,478
Financial liabilities designated at FVTPL	251,796		766,880	₩ 854,862
Financial liabilities at FVTPL	3,427,909	$ 3,211,397	3,803,358
Financial liabilities held for trading
Disclosure of financial liabilities at fair value through profit or loss [Line Items]
Financial liabilities held for trading	3,176,113		3,036,478
Gold banking liabilities
Disclosure of financial liabilities at fair value through profit or loss [Line Items]
Financial liabilities held for trading	25,964		26,501
Derivative liabilities
Disclosure of financial liabilities at fair value through profit or loss [Line Items]
Financial liabilities held for trading	3,150,149		3,009,977
Financial liabilities designated at FVTPL
Disclosure of financial liabilities at fair value through profit or loss [Line Items]
Financial liabilities designated at FVTPL	251,796		766,880
Equity linked securities index in short position
Disclosure of financial liabilities at fair value through profit or loss [Line Items]
Financial liabilities designated at FVTPL	160,057		673,906
Debentures in local currency
Disclosure of financial liabilities at fair value through profit or loss [Line Items]
Financial liabilities designated at FVTPL	₩ 91,739		₩ 92,974

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Financial Liabilitiy At Fair Value Through Profit Or Loss Credit risk adjustments to financial liabilities designated at fair value through profit or loss (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Designated financial liabilities at fair value through profit or loss [Abstract]
Financial liabilities designated at FVTPL subject to credit risk adjustments		₩ 251,796	₩ 766,880	₩ 854,862
Credit risk adjustments	[1]	(254)	(8)	(433)
Accumulated changes in credit risk adjustments	[2]	₩ 133	₩ 349	₩ 311
Additional information about credit risk adjustments		Credit risk adjustments are applied to reflect the Group’s own credit risk when measuring the fair value of derivative liabilities. The methodology to determine the adjustment incorporates the Group’s credit spread as observed through credit ratings.	Credit risk adjustments are applied to reflect the Group’s own credit risk when measuring the fair value of derivative liabilities. The methodology to determine the adjustment incorporates the Group’s credit spread as observed through credit ratings.	Credit risk adjustments are applied to reflect the Group’s own credit risk when measuring the fair value of derivative liabilities. The methodology to determine the adjustment incorporates the Group’s credit spread as observed through credit ratings.

[1] The amounts in the tabular disclosure relating to Credit risk adjustments at 31 December 2016 and at 31 December 2015 have been restated by 811 million Won and 109 million Won, respectively, due to an error in the previous year’s disclosure.

[2] The amounts in the tabular disclosure relating to Accumulated changes in credit risk adjustments at 31 December 2016 and at 31 December 2015 have been restated by 16,139 million Won and 15,327 million Won, respectively, due to an error in the previous year’s disclosure.

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Financial Liabilitiy At Fair Value Through Profit Or Loss Difference between carrying amount and nominal amount at maturity of financial liabilities at fair value through profit or loss (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of difference between carrying amount and nominal amountat maturityof financial liabilities at fair value through profit or loss designated as upon initial recognition [Abstract]
Carrying amount	₩ 251,796	₩ 766,880	₩ 854,862
Nominal amount at maturity	255,408	902,375
Difference	₩ (3,612)	₩ (135,495)

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Deposits Due To Customers Details of deposits sorted by interest type (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Disclosure of deposits from customers [Line Items]
Total	₩ 234,695,084	$ 219,871,357	₩ 221,020,411
Present value discount
Disclosure of deposits from customers [Line Items]
Total	(40,010)		(27,927)
Deposits in foreign currencies | Gross carrying amount [Member]
Disclosure of deposits from customers [Line Items]
Total	23,682,896		21,453,096
KRW [Member] | Gross carrying amount [Member]
Disclosure of deposits from customers [Line Items]
Total	211,052,198		199,595,242
KRW [Member] | Demand deposits | Gross carrying amount [Member]
Disclosure of deposits from customers [Line Items]
Total	9,349,070		9,491,680
KRW [Member] | Time deposits | Gross carrying amount [Member]
Disclosure of deposits from customers [Line Items]
Total	194,292,679		183,723,369
KRW [Member] | Mutual funds | Gross carrying amount [Member]
Disclosure of deposits from customers [Line Items]
Total	34,055		37,128
KRW [Member] | Deposits on notes payables | Gross carrying amount [Member]
Disclosure of deposits from customers [Line Items]
Total	1,323,679		943,446
KRW [Member] | Deposits on CMA | Gross carrying amount [Member]
Disclosure of deposits from customers [Line Items]
Total	164,431		203,013
KRW [Member] | Certificate of deposits | Gross carrying amount [Member]
Disclosure of deposits from customers [Line Items]
Total	4,436,443		3,836,430
KRW [Member] | Other deposits | Gross carrying amount [Member]
Disclosure of deposits from customers [Line Items]
Total	₩ 1,451,841		₩ 1,360,176

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Borrowings And Debentures Details of borrowings (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2017 USD ($)
Disclosure of detailed information about borrowings [Line Items]
Total	₩ 14,784,706	₩ 18,769,515	$ 13,850,880
Present value discount
Disclosure of detailed information about borrowings [Line Items]
Total	(165)	(667)
Borrowings in local currency
Disclosure of detailed information about borrowings [Line Items]
Total	7,084,848	7,056,238
Borrowings from The BOK | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total	₩ 1,404,087	₩ 1,598,553
Lenders	The BOK	The BOK
Borrowings from The BOK | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	0.50%	0.50%	0.50%
Borrowings from The BOK | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	0.80%	0.80%	0.80%
Small Enterprise And Market Service and others | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total	₩ 1,723,340
Lenders	Small Enterprise And Market Service and others
Small Enterprise And Market Service and others | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	0.00%		0.00%
Small Enterprise And Market Service and others | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	2.90%		2.90%
Small and Medium Business Corporation and others | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total		₩ 1,534,807
Lenders		Small and Medium Business Corporation and others
Small and Medium Business Corporation and others | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate		0.00%
Small and Medium Business Corporation and others | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate		3.50%
The Korea Development Bank and others | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total	₩ 3,957,421
Lenders	The Korea Development Bank and others
The Korea Development Bank and others | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	0.00%		0.00%
The Korea Development Bank and others | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	3.20%		3.20%
Seoul Metropolitan Government and others | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total		₩ 3,922,878
Lenders		Seoul Metropolitan Government and others
Seoul Metropolitan Government and others | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate		0.00%
Seoul Metropolitan Government and others | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate		3.80%
Borrowings in foreign currency
Disclosure of detailed information about borrowings [Line Items]
Total	₩ 7,024,836	₩ 7,755,365
The Export-Import BOK and others | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total	₩ 6,996,551	₩ 7,737,237
Lenders	The Export-Import BOK and others	The Export-Import BOK and others
The Export-Import BOK and others | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	0.00%	0.00%	0.00%
The Export-Import BOK and others | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	6.80%	5.20%	6.80%
Commonwealth Bank | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total	₩ 28,285
Lenders	Commonwealth Bank
Commonwealth Bank | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	1.80%		1.80%
Wells Fargo | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total		₩ 18,128
Lenders		Wells Fargo
Wells Fargo | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate		1.40%
Bills sold | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total	₩ 36,953	₩ 26,895
Lenders	Others	Others
Bills sold | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	0.00%	0.00%	0.00%
Bills sold | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	1.20%	1.60%	1.20%
Call money | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total	₩ 635,061	₩ 1,926,779
Lenders	Bank and others	Bank and others
Call money | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	1.50%	0.00%	1.50%
Call money | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	2.70%	5.10%	2.70%
Bonds sold under repurchase agreements | Gross carrying amount [Member]
Disclosure of detailed information about borrowings [Line Items]
Total	₩ 3,173	₩ 2,004,905
Lenders	Other financial institutions	Other financial institutions
Bonds sold under repurchase agreements | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	0.60%	0.00%	0.60%
Bonds sold under repurchase agreements | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate	12.70%	4.50%	12.70%

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Borrowings And Debentures Details of debentures (Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2017 USD ($)
Disclosure of detailed information about debentures [Line Items]
Total		₩ 27,869,651	₩ 23,565,449	$ 26,109,358
Fair value hedged amount of debentures	[1]	3,102,386	3,610,193
Cash flow hedged amount of debentures	[1]	699,029
Discounts on bond
Disclosure of detailed information about debentures [Line Items]
Total		(30,173)	(34,295)
Face value of bond | Gross carrying amount [Member]
Disclosure of detailed information about debentures [Line Items]
Total		27,899,824	23,599,744
Ordinary bonds | Gross carrying amount [Member]
Disclosure of detailed information about debentures [Line Items]
Total		₩ 22,468,908	₩ 18,268,403
Ordinary bonds | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about debentures [Line Items]
Interest rate		1.50%	1.50%
Ordinary bonds | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about debentures [Line Items]
Interest rate		5.80%	11.80%
Subordinated bonds | Gross carrying amount [Member]
Disclosure of detailed information about debentures [Line Items]
Total		₩ 4,781,301	₩ 5,327,335
Subordinated bonds | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about debentures [Line Items]
Interest rate		3.40%	3.00%
Subordinated bonds | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about debentures [Line Items]
Interest rate		12.60%	12.60%
Other bonds | Gross carrying amount [Member]
Disclosure of detailed information about debentures [Line Items]
Total		₩ 649,615	₩ 4,006
Other bonds | Gross carrying amount [Member] | Bottom of range [Member]
Disclosure of detailed information about debentures [Line Items]
Interest rate		1.60%
Other bonds | Gross carrying amount [Member] | Top of range [Member]
Disclosure of detailed information about debentures [Line Items]
Interest rate		17.00%	17.00%

[1] Included debentures under fair value hedge relationships are 3,610,193 million Won 3,102,386 million Won as of December 31, 2016 and 2017, respectively. Also, debentures under cash flow hedge amounting to 699,029 million Won are included as of December 31, 2017

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Provisions Details of provisions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 KRW (₩)		Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)		Dec. 31, 2015 KRW (₩)	Dec. 31, 2017 KRW (₩)		Dec. 31, 2016 KRW (₩)
Disclosure of other provisions [Line Items]
Total	₩ 410,470,000,000		$ 384,544	₩ 428,477,000,000			₩ 410,470,000,000		₩ 428,477,000,000
Changes in provisions
Beginning balance	428,477,000,000
Changes in other provisions [Abstract]
Ending balance	410,470,000,000		$ 384,544	428,477,000,000
Provisions except for provision for decommissioning restoration and rehabilitation costs [Member]
Disclosure of other provisions [Line Items]
Total	348,598,000,000			370,401,000,000		₩ 477,480,000,000	348,598,000,000		370,401,000,000
Changes in provisions
Beginning balance	370,401,000,000			477,480,000,000		662,276,000,000
Changes in other provisions [Abstract]
Provisions provided	111,539,000,000			44,342,000,000		97,813,000,000
Provisions used and others	(117,959,000,000)			(99,476,000,000)		(127,933,000,000)
Reversal of unused amount	(84,121,000,000)			(69,470,000,000)		(175,051,000,000)
Foreign currencies translation adjustments	(250,000,000)			2,990,000,000
Transfer	21,808,000,000	[1]		503,000,000	[2]
Others	47,180,000,000			14,032,000,000		20,375,000,000
Ending balance	₩ 348,598,000,000			₩ 370,401,000,000		477,480,000,000
Description of nature of transfer amount	According to contracts with the third parties, the Group ultimately will be reimbursed for which it has paid out on behalf of customers, which has incurred through their customer loyalty programs. Therefore, when such obligation incurs, the Group recognizes it as “transfer”, but there is no impact on the Group’s expense.		According to contracts with the third parties, the Group ultimately will be reimbursed for which it has paid out on behalf of customers, which has incurred through their customer loyalty programs. Therefore, when such obligation incurs, the Group recognizes it as “transfer”, but there is no impact on the Group’s expense.	As the credits of the affiliates were transferred to the Group, the allowance for the provisions for customer reward credits increased, for the year ended December 31, 2016.
Provision for guarantee
Disclosure of other provisions [Line Items]
Total	₩ 183,247,000,000	[3]		₩ 238,117,000,000	[3]	364,141,000,000	183,247,000,000	[3]	238,117,000,000	[3]
Changes in provisions
Beginning balance	238,117,000,000	[3]		364,141,000,000		509,320,000,000
Changes in other provisions [Abstract]
Provisions provided	4,876,000,000			4,281,000,000		19,714,000,000
Provisions used and others	(24,898,000,000)			(80,017,000,000)		(25,262,000,000)
Reversal of unused amount	(60,300,000,000)			(64,061,000,000)		(160,032,000,000)
Foreign currencies translation adjustments	9,000,000
Others	25,443,000,000			13,773,000,000		20,401,000,000
Ending balance	₩ 183,247,000,000	[3]		₩ 238,117,000,000	[3]	364,141,000,000
Description of nature of provisions for guarantee	Provision for guarantee includes provision for financial guarantee of 67,557 million Won and 71,697 million Won as of December 31, 2016 and 2017, respectively.		Provision for guarantee includes provision for financial guarantee of 67,557 million Won and 71,697 million Won as of December 31, 2016 and 2017, respectively.	Provision for guarantee includes provision for financial guarantee of 67,557 million Won and 71,697 million Won as of December 31, 2016 and 2017, respectively.
Provision for financial guarantee contract							71,697,000,000		67,557,000,000
Provision for loan commitments
Disclosure of other provisions [Line Items]
Total	₩ 66,115,000,000			₩ 87,909,000,000		85,313,000,000	66,115,000,000		87,909,000,000
Changes in provisions
Beginning balance	87,909,000,000			85,313,000,000		90,449,000,000
Changes in other provisions [Abstract]
Provisions provided	2,028,000,000			8,502,000,000		9,801,000,000
Provisions used and others	(68,000,000)			22,000,000		41,000,000
Reversal of unused amount	(23,744,000,000)			(5,409,000,000)		(14,976,000,000)
Foreign currencies translation adjustments	(10,000,000)
Others				(519,000,000)		(2,000,000)
Ending balance	66,115,000,000			87,909,000,000		85,313,000,000
Provisions for customer reward credits
Disclosure of other provisions [Line Items]
Total	40,445,000,000			22,093,000,000		5,445,000,000	40,445,000,000		22,093,000,000
Changes in provisions
Beginning balance	22,093,000,000			5,445,000,000		5,548,000,000
Changes in other provisions [Abstract]
Provisions provided	62,593,000,000			23,525,000,000		16,301,000,000
Provisions used and others	(84,979,000,000)			(8,158,000,000)		(16,404,000,000)
Transfer	21,808,000,000	[1]		503,000,000	[2]
Others	18,930,000,000			778,000,000
Ending balance	₩ 40,445,000,000			₩ 22,093,000,000		5,445,000,000
Description of nature of transfer amount	According to contracts with the third parties, the Group ultimately will be reimbursed for which it has paid out on behalf of customers, which has incurred through their customer loyalty programs. Therefore, when such obligation incurs, the Group recognizes it as “transfer”, but there is no impact on the Group’s expense.		According to contracts with the third parties, the Group ultimately will be reimbursed for which it has paid out on behalf of customers, which has incurred through their customer loyalty programs. Therefore, when such obligation incurs, the Group recognizes it as “transfer”, but there is no impact on the Group’s expense.	As the credits of the affiliates were transferred to the Group, the allowance for the provisions for customer reward credits increased, for the year ended December 31, 2016.
Other provisions
Disclosure of other provisions [Line Items]
Total	₩ 58,791,000,000	[4]		₩ 22,282,000,000	[4]	22,581,000,000	58,791,000,000	[4]	22,282,000,000	[4]
Changes in provisions
Beginning balance	22,282,000,000	[4]		22,581,000,000		56,959,000,000
Changes in other provisions [Abstract]
Provisions provided	42,042,000,000			8,034,000,000		51,997,000,000
Provisions used and others	(8,014,000,000)			(11,323,000,000)		(86,308,000,000)
Reversal of unused amount	(77,000,000)					(43,000,000)
Foreign currencies translation adjustments	(249,000,000)			2,990,000,000
Others	2,807,000,000					(24,000,000)
Ending balance	₩ 58,791,000,000	[4]		₩ 22,282,000,000	[4]	22,581,000,000
Description of nature of miscellaneous other provisions	Other provisions consist of provision for litigation, provision for loss recovery, and others.		Other provisions consist of provision for litigation, provision for loss recovery, and others.	Other provisions consist of provision for litigation, provision for loss recovery, and others.
Asset retirement obligation
Disclosure of other provisions [Line Items]
Total	₩ 61,872,000,000			₩ 58,076,000,000		39,121,000,000	₩ 61,872,000,000		₩ 58,076,000,000
Changes in provisions
Beginning balance	58,076,000,000			39,121,000,000		29,733,000,000
Changes in other provisions [Abstract]
Provisions provided	2,225,000,000			2,034,000,000		1,742,000,000
Provisions used and others	(1,283,000,000)			(1,279,000,000)		(1,316,000,000)
Reversal of unused amount	(733,000,000)			(1,000,000)		(179,000,000)
Amortization	428,000,000			464,000,000		394,000,000
Increase in restoration costs and others	3,159,000,000			17,737,000,000		8,747,000,000
Ending balance	₩ 61,872,000,000			₩ 58,076,000,000		₩ 39,121,000,000

[1] According to contracts with the third parties, the Group ultimately will be reimbursed for which it has paid out on behalf of customers, which has incurred through their customer loyalty programs. Therefore, when such obligation incurs, the Group recognizes it as “transfer”, but there is no impact on the Group’s expense.

[2] As the credits of the affiliates were transferred to the Group, the allowance for the provisions for customer reward credits increased, for the year ended December 31, 2016.

[3] Provision for guarantee includes provision for financial guarantee of 67,557 million Won and 71,697 million Won as of December 31, 2016 and 2017, respectively.

[4] Other provisions consist of provision for litigation, provision for loss recovery, and others.

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Net Defined Benefits Liability Asset Net defined benefit liability asset of group (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [Abstract]
Description of type of retirement benefit plan	Employees and directors with one or more years of service are entitled to receive a payment upon retirement of their employment, based on their length of service and rate of pay at the time of retirement.	Employees and directors with one or more years of service are entitled to receive a payment upon retirement of their employment, based on their length of service and rate of pay at the time of retirement.
Description of nature of benefits provided by plan	The assets of the plans are measured at their fair value at the end of reporting date.	The assets of the plans are measured at their fair value at the end of reporting date.
Description of significant actuarial assumptions made and method used to calculate actuarial present value of promised retirement benefits	The plan liabilities are measured using the projected unit method, which takes account of projected earnings increases, using actuarial assumptions that give the best estimate of the future cash flows that will arise under the plan liabilities.	The plan liabilities are measured using the projected unit method, which takes account of projected earnings increases, using actuarial assumptions that give the best estimate of the future cash flows that will arise under the plan liabilities.
Description of risks to which plan exposes entity	Most of Defined Benefit Retirement Pension Plans are from local subsidiaries in South Korea. The Group is exposed to various risks through defined benefit retirement pension plan, and the most significant risks are as follows: Volatility of Asset The defined benefit obligation was estimated with a discount rate which is calculated based on the yield of blue chip corporate bonds in Korea. A deficit may occur if the rate of return on plan assets falls short of the discount rate. The plan assets include equity instruments and are exposed to the related volatility and risks. Decrease in Yield of Blue Chip Bonds A decrease in yield of blue chip bonds may result in increase in defined benefit liability although the increase in the value of some debt securities in the defined benefit plan would set it off partially. Risk of Inflation Defined benefit obligations are correlated to the inflation rate; the higher the inflation rate is, the more the liabilities are recognized mainly due to the fact that inflation rate would result in increase of employee salary growth rate. As a result, a deficit may occur in the plan. However, the plan assets are less impacted since the plan assets consist of mainly debt securities with fixed rates and of equity instruments.	Most of Defined Benefit Retirement Pension Plans are from local subsidiaries in South Korea. The Group is exposed to various risks through defined benefit retirement pension plan, and the most significant risks are as follows: Volatility of Asset The defined benefit obligation was estimated with a discount rate which is calculated based on the yield of blue chip corporate bonds in Korea. A deficit may occur if the rate of return on plan assets falls short of the discount rate. The plan assets include equity instruments and are exposed to the related volatility and risks. Decrease in Yield of Blue Chip Bonds A decrease in yield of blue chip bonds may result in increase in defined benefit liability although the increase in the value of some debt securities in the defined benefit plan would set it off partially. Risk of Inflation Defined benefit obligations are correlated to the inflation rate; the higher the inflation rate is, the more the liabilities are recognized mainly due to the fact that inflation rate would result in increase of employee salary growth rate. As a result, a deficit may occur in the plan. However, the plan assets are less impacted since the plan assets consist of mainly debt securities with fixed rates and of equity instruments.
Surplus deficit in plan [Abstract]
Defined benefit obligation	₩ 1,071,170	₩ 984,381
Fair value of plan assets	(1,027,906)	(990,653)
Net defined benefit liability (asset)	₩ 43,264	₩ (6,272)

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Net Defined Benefits Liability Asset Net defined benefit liability asset of major subsidiaries (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)
Disclosure of net defined benefit liability asset of major subsidiaries [Line Items]
Net Defined Benefit Asset	₩ 1,487
Net Defined Benefit Liability(*)	₩ 44,751
Description of adjustments for internal transactions for net defined benefit liability of major subsidiaries	This number is before adjusting for internal transaction. As most entities other than Woori Bank Co, Ltd, deposit their plan asset to Woori Bank, adjusting internal transaction, the Group’s plan asset should be decreased by 43,113 million Won.
Woori Bank Co Ltd
Disclosure of net defined benefit liability asset of major subsidiaries [Line Items]
Net Defined Benefit Liability(*)	₩ 14,284
Woori Card
Disclosure of net defined benefit liability asset of major subsidiaries [Line Items]
Net Defined Benefit Asset	1,487
Woori FIS
Disclosure of net defined benefit liability asset of major subsidiaries [Line Items]
Net Defined Benefit Liability(*)	28,883
Others
Disclosure of net defined benefit liability asset of major subsidiaries [Line Items]
Net Defined Benefit Liability(*)	₩ 1,584

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Net Defined Benefits Liability Asset Changes in the carrying value of defined benefit liability asset (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of net defined benefit liability asset [Line Items]
Beginning balance		₩ (6,272)
Changes in net defined benefit liability asset [Abstract]
Current service cost		146,750	₩ 153,660	₩ 132,710
Interest expense(income)		(3,972)	(712)	(588)
Remeasurements	[1]	6,264	45,098	(103,174)
Curtailment or liquidation		(124)	339	(9)
Ending balance		43,264	(6,272)
Present value of defined benefit obligation
Disclosure of net defined benefit liability asset [Line Items]
Beginning balance		984,381	901,219	683,961
Changes in net defined benefit liability asset [Abstract]
Current service cost		146,750	153,660	132,710
Interest expense(income)		26,629	24,326	21,377
Remeasurements		(20,389)	(52,402)	97,730
Foreign currencies translation adjustments		(279)	80	(8)
Retirement benefit paid		(55,552)	(34,346)	(26,516)
Curtailment or liquidation		(10,928)	(9,536)	(8,231)
Others		558	1,380	196
Ending balance		1,071,170	984,381	901,219
Fair value of plan assets
Disclosure of net defined benefit liability asset [Line Items]
Beginning balance		990,653	801,528	608,370
Changes in net defined benefit liability asset [Abstract]
Interest expense(income)		30,601	25,038	21,965
Remeasurements		(14,125)	(7,304)	(5,444)
Employer’s contributions		43,114	226,752	229,069
Retirement benefit paid		(51,877)	(33,341)	(22,860)
Curtailment or liquidation		(11,052)	(9,198)	(8,240)
Others		40,592	(12,822)	(21,332)
Ending balance		₩ 1,027,906	₩ 990,653	₩ 801,528

[1] This is an amount before considering the tax effects.

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Net Defined Benefits Liability Asset Fair value of plan assets (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of fair value of plan assets [Abstract]
Return on plan assets, net defined benefit liability (asset)	₩ 16,476	₩ 17,734	₩ 16,521

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Net Defined Benefits Liability Asset Contributions to the plans (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)
Disclosure of estimate of contributions expected to be paid to plan [Abstract]
Percentage of bank estimate of contributions expected to be paid to plan	92.40%
Estimate of contributions expected to be paid to plan	₩ 125,818
Description of methods used and assumptions made to estimate of contributions expected to be paid to plan	The expected contribution is calculated by actuaries based on prudent assessments of the amounts needed to fund the plans in accordance with local regulations.

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Net Defined Benefits Liability Asset Analysis for the maturity which is not discounted of the defined benefit obligation of the Bank based on current wages (Details) ₩ in Millions		12 Months Ended
		Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)
Disclosure of expected maturity analysis [Line Items]
Estimated average period until the commencement of payment	[1]	12.7
Less than 1 year
Disclosure of expected maturity analysis [Line Items]
Undiscounted pension benefits including expected future benefits		₩ 53,718	₩ 48,132
1 year ~ less than 2 years
Disclosure of expected maturity analysis [Line Items]
Undiscounted pension benefits including expected future benefits		70,962	60,316
2 years ~ less than 5 years
Disclosure of expected maturity analysis [Line Items]
Undiscounted pension benefits including expected future benefits		156,561	159,238
5 years ~ less than 10 years
Disclosure of expected maturity analysis [Line Items]
Undiscounted pension benefits including expected future benefits		258,642	214,650
More than 10 years
Disclosure of expected maturity analysis [Line Items]
Undiscounted pension benefits including expected future benefits		₩ 449,738	₩ 436,417

[1] As of December 31, 2017, the estimated average period until the commencement of payment is around 12.7 years.

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Net Defined Benefits Liability Asset Current service cost net interest expense income past service cost loss gain on the curtailment or settlement and loss gain due to remeasurements (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Postemployment benefit expense defined benefit plans [Abstract]
Current service cost		₩ 146,750	₩ 153,660	₩ 132,710
Net interest income		(3,972)	(712)	(588)
Gain (loss) on the curtailment or settlement		124	(339)	9
Cost recognized in net income		142,902	152,609	132,131
Remeasurements	[1]	(6,264)	(45,098)	103,174
Cost recognized in total comprehensive income		136,638	₩ 107,511	₩ 235,305
Postemployment benefit expense defined contribution plans		₩ 3,946

[1] This is an amount before considering the tax effects.

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Net Defined Benefits Liability Asset Key actuarial assumptions used in defined benefit liability assessment (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of actuarial assumptions [Abstract]
Discount rate	3.18%	2.85%	2.83%
Future wage growth rate	6.18%	6.05%	6.35%
Mortality rate	Issued by Korea Insurance Development Institute	Issued by Korea Insurance Development Institute	Issued by Korea Insurance Development Institute
Retirement rate	Experience rate for each employment classification	Experience rate for each employment classification	Experience rate for each employment classification

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Net Defined Benefits Liability Asset Sensitivity to actuarial assumptions used in the assessment of defined benefit obligation (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Discount rate | Increase by 1% point
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase decrease in defined benefit obligation due to reasonably possible increase in actuarial assumption	₩ (116,405)	₩ (107,203)
Discount rate | Decrease by 1% point
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase decrease in defined benefit obligation due to reasonably possible decrease in actuarial assumption	137,151	125,395
Future wage growth rate | Increase by 1% point
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase decrease in defined benefit obligation due to reasonably possible increase in actuarial assumption	136,707	124,766
Future wage growth rate | Decrease by 1% point
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase decrease in defined benefit obligation due to reasonably possible decrease in actuarial assumption	₩ (117,765)	₩ (108,344)

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Other Financial Liabilities And Other Liabilities Details of other financial liabilities and other liabilities (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Other financial liabilities and other liabilities [Line Items]
Total of other financial liabilities	₩ 13,892,461	$ 13,014,991	₩ 21,985,086
Other liabilities	283,981	$ 266,041	299,376
Total of other financial liabilities and other liabilities	14,176,442		22,284,462
Present value discount
Other financial liabilities and other liabilities [Line Items]
Total of other financial liabilities	(1,597)		(833)
Account payables | Gross carrying amount [Member]
Other financial liabilities and other liabilities [Line Items]
Total of other financial liabilities	4,692,320		5,626,661
Accrued expenses | Gross carrying amount [Member]
Other financial liabilities and other liabilities [Line Items]
Total of other financial liabilities	2,049,861		2,055,936
Borrowings from trust accounts | Gross carrying amount [Member]
Other financial liabilities and other liabilities [Line Items]
Total of other financial liabilities	3,271,817		3,329,683
Agency business revenue | Gross carrying amount [Member]
Other financial liabilities and other liabilities [Line Items]
Total of other financial liabilities	344,591		331,159
Foreign exchange payables | Gross carrying amount [Member]
Other financial liabilities and other liabilities [Line Items]
Total of other financial liabilities	590,667		702,968
Domestic exchange payables | Gross carrying amount [Member]
Other financial liabilities and other liabilities [Line Items]
Total of other financial liabilities	1,309,646		8,480,765
Other miscellaneous financial liabilities | Gross carrying amount [Member]
Other financial liabilities and other liabilities [Line Items]
Total of other financial liabilities	1,635,156		1,458,747
Unearned Income | Gross carrying amount [Member]
Other financial liabilities and other liabilities [Line Items]
Other liabilities	180,664		171,050
Other miscellaneous liabilities | Gross carrying amount [Member]
Other financial liabilities and other liabilities [Line Items]
Other liabilities	₩ 103,317		₩ 128,326

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Derivatives Details of derivative assets and derivative liabilities (Details) - KRW (₩)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	₩ 268,733,330,000,000	₩ 233,870,608,000,000
Derivative assets for cash flow hedge	0
Derivative assets for fair value hedge	59,272,000,000	140,577,000,000
Derivative assets for trading	3,115,775,000,000	2,898,295,000,000
Derivative liabilities for cash flow hedge	55,651,000,000
Derivative liabilities for fair value hedge	12,103,000,000	7,221,000,000
Derivative liabilities for trading	₩ 3,150,149,000,000	₩ 3,009,977,000,000
Description of other information of derivatives held for trading and hedging	Derivatives held for trading purpose are classified into financial assets or liabilities at FVTPL (see Notes 7 and 20) and derivatives for hedging are stated as a separate line item in the consolidated statements of financial position.	Derivatives held for trading purpose are classified into financial assets or liabilities at FVTPL (see Notes 7 and 20) and derivatives for hedging are stated as a separate line item in the consolidated statements of financial position.
Futures
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	₩ 75,845,000,000	₩ 54,785,000,000
Futures | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Swaps
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	130,197,378,000,000	118,582,511,000,000
Swaps | For fair value hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for fair value hedge	59,272,000,000	139,832,000,000
Derivative liabilities for fair value hedge	12,103,000,000	7,013,000,000
Swaps | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Swaps | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for trading	223,935,000,000	470,057,000,000
Derivative liabilities for trading	253,972,000,000	509,686,000,000
Purchase options
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	630,000,000,000	860,000,000,000
Purchase options | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Purchase options | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for trading	12,346,000,000	21,172,000,000
Written options
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	795,000,000,000	1,035,000,000,000
Written options | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Written options | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative liabilities for trading	12,869,000,000	21,863,000,000
Futures
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	318,217,000,000	493,733,000,000
Futures | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Forwards
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	72,526,956,000,000	62,539,094,000,000
Forwards | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Forwards | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for trading	1,314,369,000,000	1,265,852,000,000
Derivative liabilities for trading	1,375,799,000,000	1,015,380,000,000
Swaps
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	48,176,306,000,000	39,782,049,000,000
Swaps | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Derivative liabilities for cash flow hedge	55,651,000,000
Swaps | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for trading	1,352,924,000,000	1,022,969,000,000
Derivative liabilities for trading	1,347,905,000,000	1,221,959,000,000
Purchase options
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	2,291,154,000,000	1,120,949,000,000
Purchase options | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Purchase options | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for trading	64,267,000,000	42,126,000,000
Written options
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	4,038,237,000,000	907,211,000,000
Written options | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Written options | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative liabilities for trading	58,687,000,000	8,589,000,000
Futures
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	91,436,000,000	926,392,000,000
Futures | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Swaps
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	15,000,000,000	15,000,000,000
Swaps | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Swaps | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for trading	103,000,000	92,000,000
Derivative liabilities for trading	10,000,000	88,000,000
Purchase options
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	5,060,706,000,000	3,007,969,000,000
Purchase options | For fair value hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for fair value hedge		745,000,000
Purchase options | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Purchase options | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for trading	146,775,000,000	73,261,000,000
Written options
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	4,504,290,000,000	4,460,233,000,000
Written options | For fair value hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative liabilities for fair value hedge		208,000,000
Written options | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Written options | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative liabilities for trading	99,770,000,000	228,900,000,000
Futures
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	0	5,105,000,000
Futures | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Swaps
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	7,805,000,000	7,918,000,000
Swaps | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Swaps | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for trading	1,056,000,000	2,645,000,000
Derivative liabilities for trading	1,037,000,000	2,331,000,000
Purchase options
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	0	8,307,000,000
Purchase options | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Purchase options | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for trading		121,000,000
Written options
Disclosure of detailed information about hedging instruments [Line Items]
Nominal amount	5,000,000,000	64,352,000,000
Written options | For cash flow hedge
Disclosure of detailed information about hedging instruments [Line Items]
Derivative assets for cash flow hedge	0
Written options | For trading
Disclosure of detailed information about hedging instruments [Line Items]
Derivative liabilities for trading	₩ 100,000,000	₩ 1,181,000,000

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Derivatives Gains or losses from valuation of financial instruments under hedge accounting (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [Abstract]
Gains or losses from hedged items	₩ 110,152	₩ 98,827	₩ (31,297)
Gains or losses from hedging instruments	₩ (109,447)	₩ (98,851)	₩ 38,021
Description of periods when cash flows expected to occur	Among gain (loss) on valuation of derivatives that was included in the accumulated other comprehensive income, the amount has been reclassified to loss is 56,676 million Won, before reduction of income tax effect during the year ended December 31, 2017.
Reclassification adjustments on cash flow hedges before tax	₩ 56,676

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Deferred Day 1 Profit Or Loss Changes of deferred day 1 profits or losses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of aggregate difference between fair value at initial recognition and amount determined using valuation technique yet to be recognised [Abstract]
Beginning balance	₩ 13,422	₩ 28,008	₩ 13,499
Changes in aggregate difference between fair value at initial recognition and amount determined using valuation technique yet to be recognised [Abstract]
Acquisitions	500	1,337	26,762
Amounts recognized in profits or losses	(6,506)	(15,923)	(12,253)
Ending balance	₩ 7,416	₩ 13,422	₩ 28,008
Description of accounting policy for recognising difference between fair value at initial recognition and amount determined using valuation technique	In case some variables to measure fair values of financial instruments were not observable or available in the market, valuation techniques were utilized to evaluate such financial instruments. Those financial instruments were recorded at the fair value produced by the valuation techniques as at the time of acquisition, even though there were difference noted between the transaction price and the fair value. The table above presents the difference yet to be realized as profit or losses.	In case some variables to measure fair values of financial instruments were not observable or available in the market, valuation techniques were utilized to evaluate such financial instruments. Those financial instruments were recorded at the fair value produced by the valuation techniques as at the time of acquisition, even though there were difference noted between the transaction price and the fair value. The table above presents the difference yet to be realized as profit or losses.	In case some variables to measure fair values of financial instruments were not observable or available in the market, valuation techniques were utilized to evaluate such financial instruments. Those financial instruments were recorded at the fair value produced by the valuation techniques as at the time of acquisition, even though there were difference noted between the transaction price and the fair value. The table above presents the difference yet to be realized as profit or losses.

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Capital Stock And Capital Surplus Details of share capital (Details) ₩ / shares in Units, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares	Dec. 31, 2017 KRW (₩) ₩ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 KRW (₩) ₩ / shares shares
Disclosure of classes of share capital [Line Items]
Authorized shares of common stock				5,000,000,000	5,000,000,000	5,000,000,000
Par value | ₩ / shares				₩ 5,000		₩ 5,000
Issued shares of common stock	676,000,000	676,000,000	676,000,000	676,000,000	676,000,000	676,000,000
Capital stock				₩ 3,381,392	$ 3,167,818	₩ 3,381,392
Changes in outstanding shares
Beginning balance	676,000,000	676,000,000	676,278,371
Changes in number of shares outstanding [Abstract]
Retirement of treasury stock	0	0	(278,371)
Ending balance	676,000,000	676,000,000	676,000,000

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Capital Stock And Capital Surplus Details of capital surplus (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Miscellaneous equity [Abstract]
Capital in excess of par value	₩ 269,533		₩ 269,533
Other capital surplus	16,347		16,798
Total	₩ 285,880	$ 267,824	₩ 286,331

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Hybrid Securities Details of hybrid securities classified as owners equity (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2017 USD ($)
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Hybrid securities	₩ 3,017,888	₩ 3,574,896	$ 2,827,273
Description of nature of bond type hybrid securities of other equity interest classified as owners equity	The hybrid securities mentioned above are either without a maturity date or its maturity can be extended indefinitely at the maturity date without change of terms. Further, if a resolution is passed not to pay dividends on common stock, interest payments on the hybrid securities may be skipped.	The hybrid securities mentioned above are either without a maturity date or its maturity can be extended indefinitely at the maturity date without change of terms. Further, if a resolution is passed not to pay dividends on common stock, interest payments on the hybrid securities may be skipped.
Hybrid securities of other equity interest in local currency issued in 200801
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Issue date	Jun. 20, 2008	Jun. 20, 2008
Maturity	Jun. 20, 2038	Jun. 20, 2038
Interest rate (%)	7.70%	7.70%
Hybrid securities	₩ 255,000	₩ 255,000
Hybrid securities of other equity interest in local currency issued in 201201
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Issue date	Mar. 08, 2012	Mar. 08, 2012
Maturity	Mar. 08, 2042	Mar. 08, 2042
Interest rate (%)	5.80%	5.80%
Hybrid securities		₩ 190,000
Hybrid securities of other equity interest in local currency issued in 201301
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Issue date	Apr. 25, 2013	Apr. 25, 2013
Maturity	Apr. 25, 2043	Apr. 25, 2043
Interest rate (%)	4.40%	4.40%
Hybrid securities	₩ 500,000	₩ 500,000
Hybrid securities of other equity interest in local currency issued in 201302
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Issue date	Nov. 13, 2013	Nov. 13, 2013
Maturity	Nov. 13, 2043	Nov. 13, 2043
Interest rate (%)	5.70%	5.70%
Hybrid securities	₩ 200,000	₩ 200,000
Hybrid securities of other equity interest in local currency issued in 201401
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Issue date	Dec. 12, 2014	Dec. 12, 2014
Maturity	Dec. 12, 2044	Dec. 12, 2044
Interest rate (%)	5.20%	5.20%
Hybrid securities	₩ 160,000	₩ 160,000
Hybrid securities of other equity interest in local currency issued in 201501
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Issue date	Jun. 03, 2015	Jun. 03, 2015
Maturity	Jun. 03, 2045	Jun. 03, 2045
Interest rate (%)	4.40%	4.40%
Hybrid securities	₩ 240,000	₩ 240,000
Hybrid securities of other equity interest in foreign currency issued in 200701
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Issue date	May 02, 2007	May 02, 2007
Maturity	May 02, 2037	May 02, 2037
Interest rate (%)	6.20%	6.20%
Hybrid securities		₩ 930,900
Hybrid securities of other equity interest in foreign currency issued in 201501
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Issue date	Jun. 10, 2015	Jun. 10, 2015
Maturity	Jun. 10, 2045	Jun. 10, 2045
Interest rate (%)	5.00%	5.00%
Hybrid securities	₩ 559,650	₩ 559,650
Hybrid securities of other equity interest in foreign currency issued in 201601
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Issue date	Sep. 27, 2016	Sep. 27, 2016
Interest rate (%)	4.50%	4.50%
Hybrid securities	₩ 553,450	₩ 553,450
Hybrid securities of other equity interest in foreign currency issued in 201701
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Issue date	May 16, 2017
Interest rate (%)	5.30%
Hybrid securities	₩ 562,700
Issuance cost
Disclosure of bond type hybrid securities of other equity interest classified as owner’ s equity [Line Items]
Hybrid securities	₩ (12,912)	₩ (14,104)

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Other Equity Details of other equity (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)	Dec. 31, 2014 KRW (₩)
Accumulated other comprehensive income [Abstract]
Gain on valuation of AFS financial assets	₩ 301,930		₩ 386,981
Share of other comprehensive loss of joint ventures and associates	(1,251)		(1,863)
Loss on foreign currencies translation of foreign operations	(242,700)		(48,353)
Remeasurement of the net defined benefit liability	(152,624)		(163,397)
Gain on valuation of cash flow hedges	777
Equity related to assets held for sale	4,145
Sub-total	(89,723)		173,368	₩ 102,020	₩ 66,306
Treasury shares	(34,113)		(34,113)
Other capital adjustments	(1,815,438)		(1,607,280)
Total	₩ (1,939,274)	$ (1,816,787)	₩ (1,468,025)

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Other Equity Changes in the accumulated other comprehensive income (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of analysis of other comprehensive income by item [Line Items]
Beginning balance		₩ 173,368	₩ 102,020	₩ 66,306
Changes in accumulated other comprehensive income [Abstract]
Increase (decrease)		(98,373)	191,178	142,205
Reclassification adjustments	[1]	(164,803)	(101,647)	(101,439)
Income tax effect		85	(18,183)	(5,052)
Ending balance		(89,723)	173,368	102,020
Gain (loss) on valuation of available-for-sale financial assets
Disclosure of analysis of other comprehensive income by item [Line Items]
Beginning balance		386,981	374,685	300,994
Changes in accumulated other comprehensive income [Abstract]
Increase (decrease)		80,997	114,617	190,842
Reclassification adjustments	[1]	(164,803)	(101,647)	(101,439)
Income tax effect		(1,245)	(674)	(15,712)
Ending balance		301,930	386,981	374,685
Share of other comprehensive income (loss) of joint ventures and associates
Disclosure of analysis of other comprehensive income by item [Line Items]
Beginning balance		(1,863)	6,074	2,779
Changes in accumulated other comprehensive income [Abstract]
Increase (decrease)		2,516	(9,274)	4,409
Income tax effect		(1,904)	1,337	(1,114)
Ending balance		(1,251)	(1,863)	6,074
Gain (loss) on foreign currency translation of foreign operations
Disclosure of analysis of other comprehensive income by item [Line Items]
Beginning balance		(48,353)	(70,789)	(107,721)
Changes in accumulated other comprehensive income [Abstract]
Increase (decrease)		(193,272)	30,368	49,421
Income tax effect		(1,075)	(7,932)	(12,489)
Ending balance		(242,700)	(48,353)	(70,789)
Remeasurement gain (loss) related to defined benefit plan
Disclosure of analysis of other comprehensive income by item [Line Items]
Beginning balance		(163,397)	(197,579)	(119,375)
Changes in accumulated other comprehensive income [Abstract]
Increase (decrease)		6,216	45,096	(102,467)
Income tax effect		4,557	(10,914)	24,263
Ending balance		(152,624)	(163,397)	(197,579)
Gain (loss) on valuation of cash flow hedges
Disclosure of analysis of other comprehensive income by item [Line Items]
Beginning balance			(10,371)	(10,371)
Changes in accumulated other comprehensive income [Abstract]
Increase (decrease)		1,025	₩ 10,371
Income tax effect		(248)
Ending balance		777		₩ (10,371)
Transfer to non-current assets held for sale
Changes in accumulated other comprehensive income [Abstract]
Increase (decrease)		4,145
Ending balance		₩ 4,145

[1] For the change in gain (loss) on valuation of AFS financial assets, “reclassification” is disposal or recognition of impairment losses on AFS financial assets.

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Retained Earnings Details of retained earnings (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Disclosure of changes in retained earnings [Line Items]
Beginning balance	₩ 14,611,566		₩ 13,726,122	₩ 14,165,358
Net income attributable to owners	1,512,148	$ 1,416,638	1,261,266	1,059,157
Dividends on common stock	(336,636)		(168,317)	(504,952)
Dividends on hybrid securities	(167,072)		(206,515)	(183,320)
Appreciation of merger losses				(806,640)
Repayment of hybrid securities			(990)
Retirement of treasury stock				(3,481)
Ending balance	15,620,006	$ 14,633,421	14,611,566	13,726,122
Sub-total	1,775,422		1,667,388
Sub-total	10,864,061		10,337,364
Retained earnings before appropriation	2,980,523		2,606,814
Legal reserve
Disclosure of changes in retained earnings [Line Items]
Sub-total	1,775,422		1,667,388
Earned surplus reserve
Disclosure of changes in retained earnings [Line Items]
Sub-total	₩ 1,729,754		₩ 1,622,754
Description of nature and purpose of legal reserves within equity	In accordance with the Banking Act, legal reserve are appropriated at least one tenth of the earnings after tax on every dividend declaration, not exceeding the paid in capital. This reserve may not be used other than for offsetting a deficit or transferring to capital.	In accordance with the Banking Act, legal reserve are appropriated at least one tenth of the earnings after tax on every dividend declaration, not exceeding the paid in capital. This reserve may not be used other than for offsetting a deficit or transferring to capital.	In accordance with the Banking Act, legal reserve are appropriated at least one tenth of the earnings after tax on every dividend declaration, not exceeding the paid in capital. This reserve may not be used other than for offsetting a deficit or transferring to capital.
Other legal reserve
Disclosure of changes in retained earnings [Line Items]
Sub-total	₩ 45,668		₩ 44,634
Description of nature and purpose of legal reserves within equity	Other legal reserves are appropriated in the branches located in Japan, Vietnam and Bangladesh according to the banking laws of Japan, Vietnam and Bangladesh, respectively, and may be used to offset any deficit incurred in those branches	Other legal reserves are appropriated in the branches located in Japan, Vietnam and Bangladesh according to the banking laws of Japan, Vietnam and Bangladesh, respectively, and may be used to offset any deficit incurred in those branches	Other legal reserves are appropriated in the branches located in Japan, Vietnam and Bangladesh according to the banking laws of Japan, Vietnam and Bangladesh, respectively, and may be used to offset any deficit incurred in those branches
Voluntary reserve
Disclosure of changes in retained earnings [Line Items]
Sub-total	₩ 10,864,061		₩ 10,337,364
Business rationalization reserve
Disclosure of changes in retained earnings [Line Items]
Sub-total	₩ 8,000		₩ 8,000
Description of nature and purpose of voluntary reserves within equity	Pursuant to the Restriction of Special Taxation Act, the Group was previously required to appropriate, as a reserve for business rationalization, amounts equal to tax reductions arising from tax exemptions and tax credits up to December 31, 2001. The requirement was no longer effective from 2002.	Pursuant to the Restriction of Special Taxation Act, the Group was previously required to appropriate, as a reserve for business rationalization, amounts equal to tax reductions arising from tax exemptions and tax credits up to December 31, 2001. The requirement was no longer effective from 2002.	Pursuant to the Restriction of Special Taxation Act, the Group was previously required to appropriate, as a reserve for business rationalization, amounts equal to tax reductions arising from tax exemptions and tax credits up to December 31, 2001. The requirement was no longer effective from 2002.
Reserve for financial structure improvement
Disclosure of changes in retained earnings [Line Items]
Sub-total	₩ 235,400		₩ 235,400
Description of nature and purpose of voluntary reserves within equity	From 2002 to 2014, the Finance Supervisory Services recommended banks in Korea to appropriate at least ten percent of net income after accumulated deficit for financial structure improvement, until tangible common equity ratio equals 5.5 percent. But this reserve is not available for payment of cash dividends; however, it can be used to reduce a deficit or be transferred to capital. Since 2015, reservation and appropriation became an autonomous judgment matter of the Group.	From 2002 to 2014, the Finance Supervisory Services recommended banks in Korea to appropriate at least ten percent of net income after accumulated deficit for financial structure improvement, until tangible common equity ratio equals 5.5 percent. But this reserve is not available for payment of cash dividends; however, it can be used to reduce a deficit or be transferred to capital. Since 2015, reservation and appropriation became an autonomous judgment matter of the Group.	From 2002 to 2014, the Finance Supervisory Services recommended banks in Korea to appropriate at least ten percent of net income after accumulated deficit for financial structure improvement, until tangible common equity ratio equals 5.5 percent. But this reserve is not available for payment of cash dividends; however, it can be used to reduce a deficit or be transferred to capital. Since 2015, reservation and appropriation became an autonomous judgment matter of the Group.
Additional reserve
Disclosure of changes in retained earnings [Line Items]
Sub-total	₩ 7,418,806		₩ 7,073,104
Description of nature and purpose of voluntary reserves within equity	Both of Additional reserve and other voluntary reserve are appropriated for capital adequacy and other management purpose.	Both of Additional reserve and other voluntary reserve are appropriated for capital adequacy and other management purpose.	Both of Additional reserve and other voluntary reserve are appropriated for capital adequacy and other management purpose.
Regulatory reserve for credit loss
Disclosure of changes in retained earnings [Line Items]
Sub-total	₩ 2,438,191		₩ 2,255,252
Description of nature and purpose of voluntary reserves within equity	In accordance with Article 29 of the Regulation on Supervision of Banking Business (“RSBB”), if provisions for credit losses under IFRS for the accounting purpose are lower than provisions under RSBB, the Group discloses such shortfall amount as regulatory reserve for credit loss.	In accordance with Article 29 of the Regulation on Supervision of Banking Business (“RSBB”), if provisions for credit losses under IFRS for the accounting purpose are lower than provisions under RSBB, the Group discloses such shortfall amount as regulatory reserve for credit loss.	In accordance with Article 29 of the Regulation on Supervision of Banking Business (“RSBB”), if provisions for credit losses under IFRS for the accounting purpose are lower than provisions under RSBB, the Group discloses such shortfall amount as regulatory reserve for credit loss.
Revaluation reserve
Disclosure of changes in retained earnings [Line Items]
Sub-total	₩ 751,964		₩ 753,908
Description of nature and purpose of voluntary reserves within equity	Revaluation reserve is the amount of limited dividends set by the board of directors to be the recognized as complementary capital when the gain or loss occurred in the property revaluation by adopting IFRS.	Revaluation reserve is the amount of limited dividends set by the board of directors to be the recognized as complementary capital when the gain or loss occurred in the property revaluation by adopting IFRS.	Revaluation reserve is the amount of limited dividends set by the board of directors to be the recognized as complementary capital when the gain or loss occurred in the property revaluation by adopting IFRS.
Other voluntary reserve
Disclosure of changes in retained earnings [Line Items]
Sub-total	₩ 11,700		₩ 11,700
Description of nature and purpose of voluntary reserves within equity	Revaluation reserve is the amount of limited dividends set by the board of directors to be the recognized as complementary capital when the gain or loss occurred in the property revaluation by adopting IFRS.	Revaluation reserve is the amount of limited dividends set by the board of directors to be the recognized as complementary capital when the gain or loss occurred in the property revaluation by adopting IFRS.	Revaluation reserve is the amount of limited dividends set by the board of directors to be the recognized as complementary capital when the gain or loss occurred in the property revaluation by adopting IFRS.
Retained earnings before appropriation
Disclosure of changes in retained earnings [Line Items]
Beginning balance	₩ 14,611,566		₩ 13,726,122	14,165,358
Net income attributable to owners	1,512,148		1,261,266	1,059,157
Dividends on common stock	(336,636)		(168,317)	(504,952)
Dividends on hybrid securities	(167,072)		(206,515)	(183,320)
Appreciation of merger losses				(806,640)
Repayment of hybrid securities			(990)
Retirement of treasury stock				(3,481)
Ending balance	15,620,006		14,611,566	₩ 13,726,122
Sub-total	1,775,422		1,667,388
Sub-total	10,864,061		10,337,364
Retained earnings before appropriation	₩ 2,980,523		₩ 2,606,814

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Regulatory Reserve For Credit Loss Details of planned regulatory reserve for credit loss (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of regulatory reserve for credit loss [Abstract]
Beginning balance	₩ 2,438,191	₩ 2,255,252
Planned provision of regulatory reserve for credit loss	140,266	182,939	₩ 499,110
Ending balance	₩ 2,578,457	₩ 2,438,191	₩ 2,255,252
Description of other regulatory limitations	In accordance with Paragraph 1 and 2 of Article 29 of the Regulation on Supervision of Banking Business (“RSBB”), if the estimated provisions for credit loss under IFRS for the accounting purpose are lower than those in accordance with the provisions under the RSBB, the Group shall disclose the difference as the planned regulatory reserve for credit loss.	In accordance with Paragraph 1 and 2 of Article 29 of the Regulation on Supervision of Banking Business (“RSBB”), if the estimated provisions for credit loss under IFRS for the accounting purpose are lower than those in accordance with the provisions under the RSBB, the Group shall disclose the difference as the planned regulatory reserve for credit loss.	In accordance with Paragraph 1 and 2 of Article 29 of the Regulation on Supervision of Banking Business (“RSBB”), if the estimated provisions for credit loss under IFRS for the accounting purpose are lower than those in accordance with the provisions under the RSBB, the Group shall disclose the difference as the planned regulatory reserve for credit loss.

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Regulatory Reserve For Credit Loss Details of adjusted net income and earning loss per share with planned reserves (Details) ₩ / shares in Units, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩) ₩ / shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩) ₩ / shares	Dec. 31, 2015 KRW (₩) ₩ / shares
Disclosure of adjusted earnings per share after provision reversal of regulatory reserve for credit loss [Abstract]
Net income (loss)	₩ 1,530,088	$ 1,433,445	₩ 1,277,533	₩ 1,075,392
Provision of regulatory reserve for credit loss	140,266		182,939	499,110
Adjusted net income after the provision of regulatory reserve	₩ 1,389,822		₩ 1,094,594	₩ 576,282
Adjusted EPS after the provision of regulatory reserve (Unit: Korean Won) | ₩ / shares	₩ 1,817		₩ 1,320	₩ 584

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Dividends Details of dividend paid and to be approved (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Dividends [Abstract]
Dividend paid	₩ 67,328	₩ 269,308
Dividend paid per share	₩ 100	₩ 400
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners	₩ 336,636
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share	₩ 500

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Net Interest Income Details of interest income (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Disclosure of interest income operating [Abstract]
Financial assets at FVTPL	₩ 53,348		₩ 63,408	₩ 63,143
AFS financial assets	239,030		339,518	389,443
HTM financial assets	307,965		360,054	418,065
Loans and receivables
Interest on due from banks	83,325		75,021	81,117
Interest on loans	7,835,957		7,635,791	7,700,475
Interest of other receivables	31,062		38,520	45,992
Sub-total	7,950,344		7,749,332	7,827,584
Total	₩ 8,550,687	$ 8,010,611	₩ 8,512,312	₩ 8,698,235

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Net Interest Income Details of interest expense (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Interest expense [Abstract]
Interest on deposits due to customers	₩ 2,380,263		₩ 2,547,142	₩ 2,888,529
Interest on borrowings	238,212		215,240	216,743
Interest on debentures	638,653		619,255	707,772
Interest expense on others	72,909		111,131	123,291
Total	₩ 3,330,037	$ 3,119,707	₩ 3,492,768	₩ 3,936,335

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Net Fees And Commissions Income Details of fees and commissions income recognized (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Fee and commission income [Abstract]
Banking fees	₩ 673,582		₩ 660,556	₩ 676,114
Guarantee fees	65,779		66,549	78,922
Fees from project financing	13,394		20,213	15,521
Credit card fees	1,072,423		954,502	852,250
Brokerage fees	80,872		70,928	67,692
Others	163,148		92,722	66,841
Total	₩ 2,069,198	$ 1,938,504	₩ 1,865,470	₩ 1,757,340
Disclosure of composition of banking fees	Banking fees include agency commission, fees income from electronic finance, fees income related to loan, fees for import letter of credit dealing, commission received on foreign exchange and others.	Banking fees include agency commission, fees income from electronic finance, fees income related to loan, fees for import letter of credit dealing, commission received on foreign exchange and others.	Banking fees include agency commission, fees income from electronic finance, fees income related to loan, fees for import letter of credit dealing, commission received on foreign exchange and others.	Banking fees include agency commission, fees income from electronic finance, fees income related to loan, fees for import letter of credit dealing, commission received on foreign exchange and others.

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Net Fees And Commissions Income Details of fees and commissions expense incurred (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Fee and commission expense [Abstract]
Fees paid	₩ 164,834		₩ 162,170	₩ 133,909
Credit card commissions	828,363		760,913	643,524
Brokerage commissions	558		739	615
Others	4,977		4,517	2,496
Total	₩ 998,732	$ 935,651	₩ 928,339	₩ 780,544

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Dividend Income Details of dividend income (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Disclosure Of Revenue From Dividends [Abstract]
Dividend from financial assets at FVTPL	₩ 446		₩ 996	₩ 1,217
Dividend from AFS financial assets	124,546		183,514	101,706
Total	₩ 124,992	$ 117,097	₩ 184,510	₩ 102,923

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Gains Losses On Financial Assets At Fair Value Through Profit Or Loss Details of gains or losses related to financial assets at fair value through profit or loss (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Gains Losses On Financial Instruments At Fair Value Through Profit Or Loss [Abstract]
Gains on financial assets held for trading	₩ 6,123	₩ 185,786	₩ 171,137
Gains (losses) of financial assets designated at FVTPL	(110,950)	(71,399)	69,205
Total	₩ (104,827)	₩ 114,387	₩ 240,342

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Gains Losses On Financial Assets At Fair Value Through Profit Or Loss Gains or losses on financial assets held for trading (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	₩ 6,123	₩ 185,786	₩ 171,137
Financial instruments held for trading
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	3,442	9,982	4,321
Securities
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	3,069	9,627	4,081
Other financial assets
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	373	355	240
Derivatives (for trading)
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	2,681	175,804	166,816
Interest rates derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	44,880	22,024	(11,320)
Currencies derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	(155,315)	121,063	253,461
Equity derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	113,758	34,377	(74,128)
Other derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	(642)	(1,660)	(1,197)
Gain on valuation | Securities
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	2,764	9,323	7,735
Gain on valuation | Other financial assets
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	6,524	13,628	10,195
Gain on disposals | Securities
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	20,528	24,509	32,780
Gain on disposals | Other financial assets
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	2,353	2,404	442
Gain on transactions and valuation | Interest rates derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	1,088,192	1,423,606	1,240,353
Gain on transactions and valuation | Currencies derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	7,253,426	5,804,420	4,241,317
Gain on transactions and valuation | Equity derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	511,220	293,657	92,400
Gain on transactions and valuation | Other derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	4,056	50,139	54,322
Loss on valuation | Securities
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	(13,757)	(12,681)	(13,663)
Loss on valuation | Other financial assets
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	(7,885)	(14,033)	(10,189)
Loss on disposals | Securities
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	(6,466)	(11,524)	(22,771)
Loss on disposals | Other financial assets
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	(619)	(1,644)	(208)
Loss on transactions and valuation | Interest rates derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	(1,043,312)	(1,401,582)	(1,251,673)
Loss on transactions and valuation | Currencies derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	(7,408,741)	(5,683,357)	(3,987,856)
Loss on transactions and valuation | Equity derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	(397,462)	(259,280)	(166,528)
Loss on transactions and valuation | Other derivatives
Gains losses on financial instruments held for trading [Line Items]
Total net gains and losses on financial assets held for trading	₩ (4,698)	₩ (51,799)	₩ (55,519)

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Gains Losses On Financial Assets At Fair Value Through Profit Or Loss Gains or losses on financial assets designated at fair value through profit or loss (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gains losses on financial instruments at fair value through profit or loss designated as upon initial recognition [Line Items]
Total net gains and losses on financial assets designated at FVTPL	₩ (110,950)	₩ (71,399)	₩ 69,205
Equity-linked securities
Gains losses on financial instruments at fair value through profit or loss designated as upon initial recognition [Line Items]
Total net gains and losses on financial assets designated at FVTPL	(112,476)	(76,172)	67,500
Securities
Gains losses on financial instruments at fair value through profit or loss designated as upon initial recognition [Line Items]
Total net gains and losses on financial assets designated at FVTPL	290	896	965
Other financial instruments
Gains losses on financial instruments at fair value through profit or loss designated as upon initial recognition [Line Items]
Total net gains and losses on financial assets designated at FVTPL	1,236	3,877	740
Net gains and losses on disposals | Equity-linked securities
Gains losses on financial instruments at fair value through profit or loss designated as upon initial recognition [Line Items]
Total net gains and losses on financial assets designated at FVTPL	(79,965)	(24,165)	(22,363)
Net gains and losses on disposals | Securities
Gains losses on financial instruments at fair value through profit or loss designated as upon initial recognition [Line Items]
Total net gains and losses on financial assets designated at FVTPL		14	(62)
Net gains and losses on valuation | Equity-linked securities
Gains losses on financial instruments at fair value through profit or loss designated as upon initial recognition [Line Items]
Total net gains and losses on financial assets designated at FVTPL	(32,511)	(52,007)	89,863
Net gains and losses on valuation | Securities
Gains losses on financial instruments at fair value through profit or loss designated as upon initial recognition [Line Items]
Total net gains and losses on financial assets designated at FVTPL	290	882	1,027
Net gains and losses on valuation | Other financial instruments
Gains losses on financial instruments at fair value through profit or loss designated as upon initial recognition [Line Items]
Total net gains and losses on financial assets designated at FVTPL	₩ 1,236	₩ 3,877	₩ 740

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Net Loss On Available For Sale Financial Assets Gains or losses on Availableforsale financial (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of gains losses recognised in profit or loss availableforsale financial assets [Abstract]
Gains on redemption of securities	₩ 47	₩ 721	₩ 1,089
Gains on transaction of securities	223,961	47,985	130,457
Impairment losses on securities	(31,300)	(49,741)	(134,827)
Total	₩ 192,708	₩ (1,035)	₩ (3,281)

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Impairment Losses Due To Credit Loss Impairment losses on loans and receivables guarantees and loan commitment recognized for credit loss (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Disclosure of impairment losses due to credit loss [Abstract]
Provision due to credit loss	₩ (862,273)		₩ (890,763)	₩ (1,112,139)
Reversal of provision on (provision for) guarantees	55,424		59,780	140,318
Reversal of provision on (provision for) loan commitment	21,716		(3,093)	5,175
Total	₩ (785,133)	$ (735,543)	₩ (834,076)	₩ (966,646)

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General Administrative And Other Net Operating Incomes Expenses Details of administrative expenses (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Employee benefits
Salaries	₩ 1,317,826		₩ 1,323,007	₩ 1,262,786
Employee benefits	559,562		466,585	381,283
Retirement benefit service costs	146,848		156,356	135,754
Termination	299,562		179,286	73,119
Sub total	2,323,798		2,125,234	1,852,942
Depreciation and amortisation expense [Abstract]
Depreciation and amortization	183,601		248,269	236,958
Other general and administrative expense [Abstract]
Rent	313,080		311,992	295,871
Taxes and dues	111,248		102,531	103,580
Service charges	198,828		244,543	233,860
IT expenses	70,936		83,978	100,026
Telephone and communication	65,015		63,699	60,880
Operating promotion expenses	43,850		48,115	46,638
Advertising	68,942		76,153	58,914
Printing	8,633		9,502	10,249
Traveling expenses	13,064		11,681	9,601
Supplies	6,795		6,827	6,822
Insurance premium	8,548		8,092	7,236
Reimbursement	27,516		26,846	23,779
Maintenance	16,081		16,470	14,565
Water, light and heating	14,165		15,006	15,205
Vehicle maintenance	9,902		9,987	10,400
Others	46,799		69,551	62,861
Sub total	1,023,402		1,104,973	1,060,487
Total	3,530,801	$ 3,307,789	3,478,476	3,150,387
Paid amount for defined contribution type pension plan	3,946
Expenses related to defined benefit type pension plan	₩ 142,902		₩ 152,609	₩ 132,131

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General Administrative And Other Net Operating Incomes Expenses Details of other operating incomes (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other operating income [Abstract]
Gains on transaction of foreign exchange	₩ 3,391,095	₩ 4,791,772	₩ 3,352,318
Gains on disposal of loans and receivables	205,490	204,239	186,939
Gains on transactions of derivatives	122	130	59,003
Gains on fair value hedged items	53,532	99,302	25,235
Others	86,159	112,079	158,806
Total	3,736,398	5,207,522	3,782,301
Income for payment to other creditor financial institutions	₩ 29,336	₩ 74,700	₩ 137,187

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General Administrative And Other Net Operating Incomes Expenses Details of other operating expenses (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other operating expenses [Abstract]
Losses on transaction of foreign exchange		₩ 2,886,535	₩ 4,706,055	₩ 3,429,638
KDIC deposit insurance fees		304,055	298,804	266,031
Contribution to miscellaneous funds		286,000	295,601	343,703
Losses on disposal of loans and receivables		9,221	4,265	43,266
Losses related to derivatives		109,569	98,981	20,982
Losses on fair value hedged items			475	56,532
Others	[1]	172,331	171,120	232,210
Total		3,767,711	5,575,301	4,392,362
Expenses for payment to other creditor financial institutions		₩ 5,237	₩ 109,063	₩ 154,897

[1] Others include such expenses amounting to 154,897 million Won, 109,063 million Won and 5,237 million Won for the year ended December 31, 2015, 2016 and 2017, respectively, that the Group recognized for it is to carry out a payment to other creditor financial institutions in accordance with the creditor financial institutions committee agreement. In addition, other expense for the year ended December 31, 2017 includes 48,292 million Won of intangible asset amortization expense.

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Other Net Non Operating Income Details of non operating incomes and expenses (Details) $ in Thousands, ₩ in Millions		12 Months Ended
		Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Gain or loss on valuation of investments in associates and joint ventures
Gain on valuation		₩ 83,506		₩ 36,757	₩ 41,363
Loss on valuation		(70,117)		(55,091)	(55,176)
Impairment loss		(114,903)		(1,173)	(56,311)
Total		(101,514)	$ (95,102)	(19,507)	(70,124)
Other income disclosure nonoperating [Abstract]
Rental fee income		6,973		7,291	8,225
Gains on disposal of investment in joint ventures and associates		39,932		23,457	61,653
Gains on disposal of premises and equipment and other assets		5,028		1,885	6,814
Reversal of impairment loss on premises and equipment and other assets		666		3,581	539
Others		31,762		96,058	195,379	[1]
Total		84,361		132,272	272,610
Other expense disclosure nonoperating [Abstract]
Depreciation on investment properties		3,902		3,762	3,806
Interest expenses of rent leasehold deposits		459		496	688
Losses on disposal of investment in joint ventures and associates		38,713		15,060	10
Losses on disposal of premises and equipment and other assets		9,994		9,718	2,707
Impairment losses on premises and equipment and other assets		390		1,936	2,990
Donation		98,132		43,939	46,266
Others		38,493		58,671	45,659
Total		190,083		133,582	102,126
Total		₩ (105,722)	$ (99,044)	₩ (1,310)	170,484
Gains losses on litigation settlements	[2]				₩ 132,784

[1] Others include the receipt of guaranteed payment, which was amounting to 132,784 million Won, during the year ended December 31, 2015 that the Group received in accordance with the final irrevocable verdict for the payment of commitment (Note 44).

[2] Others include the receipt of guaranteed payment, which was amounting to 132,784 million Won, during the year ended December 31, 2015 that the Group received in accordance with the final irrevocable verdict for the payment of commitment (Note 44).

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Income Tax Expense Details of income tax expenses (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Current tax expense
Current tax expense in respect of the current year	₩ 471,669		₩ 332,996	₩ 362,552
Adjustments recognized in the current period in relation to the current tax of prior periods	(5,209)		(22,138)	(27,038)
Sub total	466,460		310,858	335,514
Deferred tax expense
Deferred tax expense (benefit) relating to the origination and reversal of temporary differences	(47,464)		(18,766)	44,884
Deferred tax charged directly to other comprehensive income	422		(16,236)	(3,844)
Sub total	(47,042)		(35,002)	41,040
Income tax expense	₩ 419,418	$ 392,927	₩ 275,856	₩ 376,554

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Income Tax Expense Relationship between net income loss before income tax expense and Income tax expense benefit (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Reconciliation of accounting profit multiplied by applicable tax rates [Abstract]
Net income before income tax expense	₩ 1,949,506	$ 1,826,372	₩ 1,553,389	₩ 1,451,946
Tax calculated at statutory tax rate	471,318		375,458	350,909
Adjustments:
Effect of income that is exempt from taxation	(55,983)		(75,166)	(56,247)
Effect of expense that is not deductible in determining taxable profit	22,254		13,664	50,152
Adjustments recognized in the current period in relation to the current tax of prior periods	(5,209)		(22,138)	(27,038)
Effect on deferred tax balances due to the change in income tax rate from 24.2% to 27.5% (effective January 1, 2018)	(35,987)
Others	23,025		(15,962)	58,778
Sub total	(51,900)		(99,602)	25,645
Income tax expense	₩ 419,418		₩ 275,856	₩ 376,554
Effective tax rate	21.51%	21.51%	17.76%	25.93%
Description of applicable tax rate by taxable income	Applicable income tax rate; 1) 11% for below 200 million Won, 2) 22% for from 200 million Won to 20 billion Won, 3) 24.2% for above 20 billion Won.	Applicable income tax rate; 1) 11% for below 200 million Won, 2) 22% for from 200 million Won to 20 billion Won, 3) 24.2% for above 20 billion Won.	Applicable income tax rate; 1) 11% for below 200 million Won, 2) 22% for from 200 million Won to 20 billion Won, 3) 24.2% for above 20 billion Won.	Applicable income tax rate; 1) 11% for below 200 million Won, 2) 22% for from 200 million Won to 20 billion Won, 3) 24.2% for above 20 billion Won.

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Income Tax Expense Details of Temporary differences unused tax losses and credits (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	₩ 209,984		₩ 191,218	₩ 236,101	[1]
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	47,043		35,002	(41,039)
Recognized as other comprehensive income (expense)	422		(16,236)	(3,844)
Ending balance	₩ 257,449		209,984	191,218
Description of composition of other termporary differences	Among the deferred tax assets and liabilities classified as ‘Others,’ the deferred tax asset arising from accumulated deficit amounts to 15,652 million Won
Gain (loss) on financial assets at FVTPL
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	₩ 427,205		445,729	422,910
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	70,996		(18,524)	22,819
Ending balance	498,201		427,205	445,729
Gain (loss) on available for sale financial assets
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	(122,145)		(121,536)	(105,556)
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	1,011		57	94
Recognized as other comprehensive income (expense)	(1,008)		(666)	(16,074)
Ending balance	(122,142)		(122,145)	(121,536)
Gain (loss) on valuation using the equity method of accounting
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	32,943		5,106	21,156
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	(6,473)		26,500	(14,936)
Recognized as other comprehensive income (expense)	(1,904)		1,337	(1,114)
Ending balance	24,566		32,943	5,106
Gain (loss) on valuation of derivatives
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	(43,853)		(39,774)	(48,438)
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	33,806		(4,079)	8,664
Recognized as other comprehensive income (expense)	(248)
Ending balance	(10,295)		(43,853)	(39,774)
Accrued income
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	(69,960)		(82,148)	(75,094)
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	8,972		12,188	(7,054)
Ending balance	(60,988)		(69,960)	(82,148)
Provision for loan losses
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	(46,811)		(50,504)	(59,428)
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	(886)		3,693	8,924
Ending balance	(47,697)		(46,811)	(50,504)
Loan and receivables written off
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	53,915		54,225	6,921
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	(44,138)		(310)	47,304
Ending balance	9,777		53,915	54,225
Loan origination costs and fees
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	(108,102)		(103,912)	(88,476)
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	(29,218)		(4,190)	(15,436)
Ending balance	(137,320)		(108,102)	(103,912)
Defined benefit liability
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	225,045		203,423	151,666
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	54,533		32,536	26,912
Recognized as other comprehensive income (expense)	4,656		(10,914)	24,845
Ending balance	284,234		225,045	203,423
Deposits with employee retirement insurance trust
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	(226,321)		(187,044)	(135,474)
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	(61,012)		(39,277)	(51,570)
Ending balance	(287,333)		(226,321)	(187,044)
Provision for guarantee
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	41,138		69,225	84,530
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	(10,536)		(28,087)	(15,305)
Ending balance	30,602		41,138	69,225
Other provisions
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	32,392		27,898	37,029
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	12,761	[2]	4,494	(9,131)
Ending balance	45,153	[2]	32,392	27,898
Others
Reconciliation of changes in deferred tax liability asset [Abstract]
Beginning balance	14,538		(29,470)	24,355
Changes in deferred tax liability asset [Abstract]
Recognized as income (expense)	17,227		50,001	(42,324)
Recognized as other comprehensive income (expense)	(1,074)		(5,993)	(11,501)
Ending balance	₩ 30,691		₩ 14,538	₩ (29,470)

[1] The beginning balance incorporates the deferred tax assets (liabilities) from subsidiaries that were reclassified into disposal group held for sale and disposal groups held for distribution to owners.

[2] Among the deferred tax assets and liabilities classified as ‘Others,’ the deferred tax asset arising from accumulated deficit amounts to 15,652 million Won.

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Income Tax Expense Unrecognized temporary differences (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2017	Dec. 31, 2016
Disclosure of unrecognized temporary difference unused tax losses and unused tax credits [Abstract]
Deductible temporary differences	[1]	₩ 126,818	₩ 59,803
Unused tax losses		96,135	192,138
Taxable temporary differences	[1]	(1,298,586)	(1,263,200)
Total		₩ (1,075,633)	₩ (1,011,259)

[1] The amounts in the tabular disclosure at 31 December 2016 have been restated by (164,649) million Won relating to Deductible temporary differences and (394,659) million Won relating to Taxable temporary differences, respectively, due to an error in the previous year’s disclosure.

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Income Tax Expense Deferred tax charged directly to other comprehensive income (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of deferred tax relating to items charged or credited directly to equity [Abstract]
Loss on available for sale financial assets	₩ (114,169)	₩ (113,161)
Share of other comprehensive gain (loss) of joint ventures and associates	(954)	950
Gain on foreign operations translation	15,855	16,930
Remeasurements	56,317	51,661
Loss on valuation of cash flow hedges	(248)
Total	₩ (43,199)	₩ (43,620)

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Income Tax Expense Current tax assets and liabilities (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)
Disclosure of current tax assets liabilities [Abstract]
Current tax assets	₩ 4,722	$ 4,424	₩ 6,229
Current tax liabilities	₩ 232,600	$ 217,909	₩ 171,192

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Income Tax Expense Deferred tax assets and liabilities (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)	Dec. 31, 2014 KRW (₩)	[1]
Deferred tax assets and liabilities [Abstract]
Deferred tax assets	₩ 280,130	$ 262,436	₩ 232,007
Deferred tax liabilities	22,681	$ 21,249	22,023
Net deferred tax assets	₩ 257,449		₩ 209,984	₩ 191,218	₩ 236,101

[1] The beginning balance incorporates the deferred tax assets (liabilities) from subsidiaries that were reclassified into disposal group held for sale and disposal groups held for distribution to owners.

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Earnings Per Share Details of earnings per share (Details) ₩ / shares in Units, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩) ₩ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 KRW (₩) ₩ / shares shares	Dec. 31, 2015 KRW (₩) ₩ / shares shares
Basic earnings per share [Abstract]
Net income attributable to common shareholders	₩ 1,512,148	$ 1,416,638	₩ 1,261,266	₩ 1,059,157
Dividends to hybrid securities	(167,072)		(206,515)	(183,320)
Net income attributable to common shareholders	₩ 1,345,076		₩ 1,054,751	₩ 875,837
Weighted average number of common shares outstanding | shares	673,000,000	673,000,000	673,000,000	673,000,000
Basic Earnings Per Share | ₩ / shares	₩ 1,999		₩ 1,567	₩ 1,301

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Contingent Liabilities And Commitments Details of contingent liabilities (Details) ₩ in Millions		12 Months Ended
		Dec. 31, 2017 KRW (₩)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2015 KRW (₩)
Disclosure of contingent liabilities [Line Items]
Loan commitments		₩ 80,760,325	₩ 83,795,496
Gains and losses on litigation settlements	[1]			₩ 132,784
Description of gain related to litigation settlement				The Group (Woori Bank), along with other 13 financial institutions including the Seoul Guarantee Insurance, filed a lawsuit against Samsung Group and its associates as a defendant in respect to the return of the fund that was guaranteed for the filing of court administration of Samsung Motors. With respect to the lawsuit, on January 29, 2015, the Supreme Court of Korea made the final judgment that the dependant should pay the guaranteed funds to the Group and other financial institutions. The Group recognized 132,784 million Won, as a gain for the year ended December 31, 2015, in accordance with IAS 37 – Provisions, Contingent liabilities and Contingent assets.
Confirmed guarantees
Disclosure of contingent liabilities [Line Items]
Total of confirmed guarantees		6,875,021	8,270,187
Guarantee for loans
Disclosure of contingent liabilities [Line Items]
Total of confirmed guarantees		157,299	79,566
Acceptances
Disclosure of contingent liabilities [Line Items]
Total of confirmed guarantees		320,519	504,354
Letters of guarantees
Disclosure of contingent liabilities [Line Items]
Total of confirmed guarantees		108,238	97,606
Other confirmed guarantees
Disclosure of contingent liabilities [Line Items]
Total of confirmed guarantees		6,288,965	7,588,661
Unconfirmed guarantees
Disclosure of contingent liabilities [Line Items]
Total of unconfirmed guarantees		4,526,593	5,101,701
Local letter of credit
Disclosure of contingent liabilities [Line Items]
Total of unconfirmed guarantees		383,117	397,588
Letter of credit
Disclosure of contingent liabilities [Line Items]
Total of unconfirmed guarantees		3,637,787	3,844,345
Other unconfirmed guarantees
Disclosure of contingent liabilities [Line Items]
Total of unconfirmed guarantees		505,689	859,768
CP purchase commitments and others
Disclosure of contingent liabilities [Line Items]
Commercial paper puchase and others commitments		1,458,101	1,389,896
Loan commitments
Disclosure of contingent liabilities [Line Items]
Loan commitments		80,760,325	83,795,496
Other commitments
Disclosure of contingent liabilities [Line Items]
Other commitments		₩ 4,546,090	₩ 4,840,593
Law suits as plaintiff in the normal course of the business [Member]
Disclosure of contingent liabilities [Line Items]
Number of cases as plaintiffs		83	88
Amount of litigation as plaintiff		₩ 413,267	₩ 308,848
Law suits as defendant in the normal course of the business [Member]
Disclosure of contingent liabilities [Line Items]
Number of cases as defendants		155	175
Amount of litigation as defendant		₩ 244,767	₩ 246,465
Allowance for litigations		₩ 9,277	₩ 5,946
Other
Disclosure of contingent liabilities [Line Items]
Indication of uncertainties of amount or timing of outflows contingent liabilities		The Group provides clearance services for payments in Korean Won in order to facilitate trade transactions between Korea and Iran. In connection with these services, the Group is currently being investigated by US government agencies including US prosecutors(United States Attorney’s Office and New York State Attorney General’s Office) as to whether the Group has violated United States laws by participating in prohibited transactions involving countries sanctioned by the US. The Group has decided not to disclose the required disclosures stated in IAS 37 ‘Provisions, Contingent Liabilities and Contingent Assets’ as such information may adversely affect the current investigation against the Group.

[1] Others include the receipt of guaranteed payment, which was amounting to 132,784 million Won, during the year ended December 31, 2015 that the Group received in accordance with the final irrevocable verdict for the payment of commitment (Note 44).

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Related Party Transactions Details of related parties transactions (Details) - KRW (₩)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Payment guarantees to related parties		₩ 71,459,000,000		₩ 70,587,000,000
KDIC
Outstanding balances for related party transactions [Abstract]
Loans		0		9,000,000
Other assets		0		270,041,000,000
Deposits due to customers		0		1,894,631,000,000
Other liabilities		0		15,568,000,000
Related party transactions [Abstract]
Interest income		0		11,778,000,000		₩ 22,237,000,000
Interest expenses		₩ 15,331,000,000		20,966,000,000		23,584,000,000
Impairment losses due to credit loss						₩ 29,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Loan commitment				₩ 1,500,000,000,000
Description of nature of related party relationship		Corporation that have significant influence over the group		Corporation that have significant influence over the group		Corporation that have significant influence over the group
Description of changes of ownership interest of related party	[1]	As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been excluded from the corporation that have significant influence over the Group.
Kumho Tires Co Inc
Outstanding balances for related party transactions [Abstract]
Loans		₩ 170,917,000,000		₩ 299,523,000,000
Allowance for credit loss		(156,712,000,000)		(715,000,000)
Deposits due to customers		666,000,000		45,957,000,000
Other liabilities		50,000,000		50,000,000
Related party transactions [Abstract]
Interest income		2,641,000,000		2,430,000,000		₩ 2,698,000,000
Interest expenses		1,000,000		68,000,000		205,000,000
Fees income		5,000,000		6,000,000		6,000,000
Impairment losses due to credit loss		155,997,000,000		162,000,000		₩ (2,353,000,000)
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Loan commitment		636,000,000		126,435,000,000
Letter of credit and others		₩ 4,181,000,000		₩ 24,187,000,000
Description of nature of related party relationship		Associates		Associates		Associates
Woori Blackstone Korea Opportunity Private Equity Fund No.1
Outstanding balances for related party transactions [Abstract]
Other assets		₩ 0		₩ 34,000,000
Other liabilities		0		306,000,000
Related party transactions [Abstract]
Fees income		₩ 6,225,000,000		₩ 1,364,000,000		₩ 1,437,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Description of nature of related party relationship		Associates		Associates		Associates
Woori Service Networks Co Ltd
Outstanding balances for related party transactions [Abstract]
Loans		₩ 45,000,000		₩ 29,000,000
Deposits due to customers		1,311,000,000		2,572,000,000
Other liabilities		357,000,000		393,000,000
Related party transactions [Abstract]
Interest expenses		24,000,000		49,000,000		₩ 83,000,000
Fees expenses		543,000,000		985,000,000		821,000,000
Impairment losses due to credit loss						2,000,000
Other income		30,000,000		29,000,000		28,000,000
Other expenses		507,000,000		222,000,000		₩ 228,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Loan commitment		₩ 155,000,000		₩ 171,000,000
Description of nature of related party relationship		Associates		Associates		Associates
Korea Credit Bureau Co Ltd
Outstanding balances for related party transactions [Abstract]
Loans		₩ 6,000,000		₩ 2,000,000
Deposits due to customers		5,586,000,000		5,069,000,000
Other liabilities		54,000,000		40,000,000
Related party transactions [Abstract]
Interest expenses		82,000,000		138,000,000		₩ 74,000,000
Fees expenses		2,079,000,000		1,915,000,000		₩ 1,690,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Loan commitment		₩ 29,000,000		₩ 33,000,000
Description of nature of related party relationship		Associates		Associates		Associates
Korea Finance Security Co Ltd
Outstanding balances for related party transactions [Abstract]
Loans		₩ 56,000,000		₩ 55,000,000
Deposits due to customers		2,854,000,000		2,801,000,000
Other liabilities		7,000,000		6,000,000
Related party transactions [Abstract]
Interest expenses		12,000,000		10,000,000		₩ 39,000,000
Fees expenses		0		110,000,000		93,000,000
Impairment losses due to credit loss						₩ (3,000,000)
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Loan commitment		₩ 204,000,000		₩ 205,000,000
Description of nature of related party relationship		Associates		Associates		Associates
Chin Hung International Inc
Outstanding balances for related party transactions [Abstract]
Loans		₩ 408,000,000		₩ 4,320,000,000
Allowance for credit loss		(22,000,000)		(4,287,000,000)
Deposits due to customers		46,220,000,000		14,047,000,000
Other liabilities		1,658,000,000		279,000,000
Related party transactions [Abstract]
Interest income		364,000,000		240,000,000		₩ 807,000,000
Interest expenses		27,000,000		28,000,000		35,000,000
Fees income		1,000,000		1,000,000		1,000,000
Impairment losses due to credit loss		(4,265,000,000)		(481,000,000)		₩ (534,000,000)
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Loan commitment		₩ 31,891,000,000		₩ 40,904,000,000
Description of nature of related party relationship		Associates		Associates		Associates
Poonglim Industrial Co Ltd
Outstanding balances for related party transactions [Abstract]
Deposits due to customers		₩ 4,000,000		₩ 283,000,000
Related party transactions [Abstract]
Interest expenses		0		2,000,000		₩ 11,000,000
Impairment losses due to credit loss		₩ 0		₩ (1,557,000,000)		₩ (1,565,000,000)
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Description of nature of related party relationship		Associates		Associates		Associates
STX Engine Co Ltd
Outstanding balances for related party transactions [Abstract]
Loans		₩ 106,176,000,000		₩ 107,974,000,000
Allowance for credit loss		(88,734,000,000)		(89,531,000,000)
Deposits due to customers		18,092,000,000		13,260,000,000
Other liabilities		29,000,000		588,000,000
Related party transactions [Abstract]
Interest income		1,417,000,000		1,348,000,000		₩ 1,358,000,000
Interest expenses		147,000,000		97,000,000		46,000,000
Fees income		28,000,000		58,000,000		67,000,000
Impairment losses due to credit loss		(797,000,000)		63,866,000,000		₩ 20,524,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Loan commitment				685,000,000
Letter of credit and others		₩ 68,858,000,000		₩ 63,103,000,000
Description of nature of related party relationship		Associates		Associates		Associates
Samho International Co Ltd
Outstanding balances for related party transactions [Abstract]
Loans		₩ 0		₩ 37,327,000,000
Allowance for credit loss		0		(717,000,000)
Deposits due to customers		0		82,917,000,000
Other liabilities		0		216,000,000
Related party transactions [Abstract]
Interest income		486,000,000		916,000,000		₩ 1,015,000,000
Interest expenses		334,000,000		525,000,000		981,000,000
Fees income		5,000,000		5,000,000		3,000,000
Impairment losses due to credit loss		₩ (717,000,000)		(5,166,000,000)		₩ (2,098,000,000)
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Loan commitment				₩ 30,083,000,000
Description of nature of related party relationship		Associates		Associates		Associates
Description of changes of ownership interest of related party	[2]	As the Group sold its entire ownership interest of the entity, it is excluded from the investment in associates during the years ended December 31, 2017.
Force TEC Co Ltd
Related party transactions [Abstract]
Interest income		₩ 0		₩ 153,000,000		₩ 249,000,000
Impairment losses due to credit loss						₩ 5,900,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Description of nature of related party relationship		Associates	[3]	Associates		Associates
Hana Engineering and Construction Co Ltd
Related party transactions [Abstract]
Impairment losses due to credit loss						₩ (98,000,000)
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Description of nature of related party relationship		Associates	[4]	Associates		Associates
Description of changes of ownership interest of related party				As the Group sold its ownership interests in the entities during the year ended December 31, 2016, these entities were excluded from the investment in associates.
STX Corporation
Outstanding balances for related party transactions [Abstract]
Loans		₩ 47,711,000,000		₩ 144,035,000,000
Allowance for credit loss		(31,210,000,000)		(92,643,000,000)
Deposits due to customers		77,555,000,000		14,412,000,000
Other liabilities		80,000,000		90,000,000
Related party transactions [Abstract]
Interest income		219,000,000		1,039,000,000		₩ 1,729,000,000
Interest expenses		4,000,000		7,000,000		6,000,000
Fees income		30,000,000		75,000,000		89,000,000
Impairment losses due to credit loss		(61,432,000,000)		73,457,000,000		₩ (4,060,000,000)
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Loan commitment		53,000,000		71,000,000
Letter of credit and others		₩ 17,557,000,000		₩ 24,316,000,000
Description of nature of related party relationship		Associates		Associates		Associates
Osung LST Co Ltd
Outstanding balances for related party transactions [Abstract]
Loans		₩ 0		₩ 0
Allowance for credit loss		0		0
Related party transactions [Abstract]
Interest income		0		170,000,000		₩ 226,000,000
Interest expenses		0		1,000,000		16,000,000
Impairment losses due to credit loss		₩ 0		₩ (338,000,000)		₩ (223,000,000)
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Description of nature of related party relationship		Associates	[4]	Associates		Associates
Description of changes of ownership interest of related party				As the Group sold its ownership interests in the entities during the year ended December 31, 2016, these entities were excluded from the investment in associates.
Ilyang Construction Co Ltd
Related party transactions [Abstract]
Impairment losses due to credit loss						₩ 215,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Description of nature of related party relationship		Associates	[4]	Associates		Associates
Description of changes of ownership interest of related party				As the Group sold its ownership interests in the entities during the year ended December 31, 2016, these entities were excluded from the investment in associates.
Woori Columbus First Private Equity Fund
Related party transactions [Abstract]
Fees income		₩ 272,000,000		₩ 308,000,000		₩ 546,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Description of nature of related party relationship		Associates		Associates		Associates
K BANK Co Ltd
Outstanding balances for related party transactions [Abstract]
Loans		₩ 212,000,000
Other assets		0		₩ 325,000,000
Related party transactions [Abstract]
Fees income		0		296,000,000
Other income		₩ 1,051,000,000		₩ 1,638,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Description of nature of related party relationship		Associates		Associates		Associates
Description of changes of ownership interest of related party	[5]			Due to capital contribution during the year ended December 31, 2016, the entity has been included in the investment in associates.
Well to Sea No.3 Private Equity Fund
Outstanding balances for related party transactions [Abstract]
Loans		₩ 73,810,000,000
Allowance for credit loss		(39,000,000)
Deposits due to customers		61,000,000
Other liabilities		27,000,000
Related party transactions [Abstract]
Interest income		982,000,000
Interest expenses		4,000,000
Impairment losses due to credit loss		39,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Loan commitment		₩ 236,190,000,000
Description of nature of related party relationship		Associates		Associates		Associates
Description of changes of ownership interest of related party	[6]	Due to capital contribution by the Group during the year ended December 31, 2017, the entity was included in the investment in associates.
Others
Outstanding balances for related party transactions [Abstract]
Loans		₩ 499,000,000		₩ 619,000,000
Allowance for credit loss		(471,000,000)		(253,000,000)
Other assets		1,000,000		8,000,000
Deposits due to customers		2,906,000,000		4,460,000,000
Other liabilities		73,000,000		60,000,000
Related party transactions [Abstract]
Interest expenses		13,000,000		17,000,000
Impairment losses due to credit loss		₩ 218,000,000		₩ 253,000,000
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Description of nature of related party relationship		Associates		Associates		Associates
Description of other related parties with outstanding balances		Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2016 and 2017	[7]	Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2016 and 2017	[8]
Description of other related parties with transactions		Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2017, and Saman Corporation, Kyesan Engineering Co., Ltd., Gachi Staff Co., Ltd., QTS Shipping Co., Ltd., and others were included as of December 31, 2016, respectively.	[8]	Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2017, and Saman Corporation, Kyesan Engineering Co., Ltd., Gachi Staff Co., Ltd., QTS Shipping Co., Ltd., and others were included as of December 31, 2016, respectively.
Ansang Tech Co Ltd
Related party transactions [Abstract]
Impairment losses due to credit loss						₩ (38,000,000)
Disclosure of outstanding commitments made by entity related party transactions [Abstract]
Description of nature of related party relationship		Associates	[9]	Associates		Associates

[1] As its ownership interest in the Group is lower than 20% as of December 31, 2017, it has been excluded from the corporation that have significant influence over the Group.

[2] As the Group sold its entire ownership interest of the entity, it is excluded from the investment in associates during the years ended December 31, 2017.

[3] The entity is not in scope for the associates as of December 31, 2017, because the Group does not have significant influence over the entity due to the fact that it is going through workout process under receivership.

[4] As the Group sold its ownership interests in the entities during the year ended December 31, 2016, these entities were excluded from the investment in associates.

[5] Due to capital contribution during the year ended December 31, 2016, the entity has been included in the investment in associates.

[6] Due to capital contribution by the Group during the year ended December 31, 2017, the entity was included in the investment in associates.

[7] Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2016 and 2017

[8] Others include Saman Corporation, Kyesan Engineering Co., Ltd., Hyunwoo International Co., Ltd., DAEA SNC Co., Ltd. and others as of December 31, 2017, and Saman Corporation, Kyesan Engineering Co., Ltd., Gachi Staff Co., Ltd., QTS Shipping Co., Ltd., and others were included as of December 31, 2016, respectively.

[9] As the Group sold its ownership interests in the entities during the year ended December 31, 2015, these entities were excluded from the investment in associates.

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Related Party Transactions Compensation for key management (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [Abstract]
Short term benefits	₩ 12,024	₩ 9,523	₩ 10,288	[1]
Severance payments	472	424	473	[1]
Total	₩ 12,496	₩ 9,947	₩ 10,761	[1]
Description of nature of key management personnel		Key management includes registered executives and non-registered executives.	Key management includes registered executives and non-registered executives.
Description of provisions to outstanding balances of key management personnel	Outstanding assets and liabilities from transactions with key management amount to 2,439 million Won and 6,309 million Won, respectively, as of December 31, 2017. With respect to the assets, the Group has not recognized any allowance, nor provision.

[1] As the scope of the compensation for key management disclosure has changed, the comparative amounts are restated.

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Business Combination Details of Business combination (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2016 KRW (₩)
Business combination in 2016
Disclosure of business combinations [Line Items]
Name of acquirer
I. Consideration
Cash and Cash equivalents	₩ 181,075
II. Identifiable assets and liabilities
Cash and Cash equivalents	48,774
AFS financial assets	2,125
Loan and receivables	282,317
Property and equipment	651
Intangible assets	205
Other assets	8,792
Sub-total	342,864
Deposits	148,521
Allowance for credit losses	352
Other liabilities	3,655
Sub-total	152,528
Fair value of identifiable net asset	190,336
III. Non-controlling interest	17,118
IV. Goodwill	₩ 7,857
Woori Wealth Bank in Philippines
Disclosure of business combinations [Line Items]
Name of acquirer	Woori Bank
Name of acquiree	Wealth Development Bank, a savings bank in Philippines
Description of acquiree	The Group acquired 51% interest ownership in Wealth Development Bank, a savings bank in Philippines, in October 2016. As the residual shares of 49% is owned by Viscal group, which operates retail businesses.
Date of acquisition	Oct-16
Percentage of voting equity interests acquired	51.00%
Description of primary reasons for business combination	The Group plans to expand its business operation through retail channels of Viscal group.
I. Consideration
Cash and Cash equivalents	₩ 25,675
II. Identifiable assets and liabilities
Cash and Cash equivalents	48,774
AFS financial assets	2,125
Loan and receivables	126,917
Property and equipment	651
Intangible assets	205
Other assets	8,792
Sub-total	187,464
Deposits	148,521
Allowance for credit losses	352
Other liabilities	3,655
Sub-total	152,528
Fair value of identifiable net asset	34,936
III. Non-controlling interest	17,118
IV. Goodwill	₩ 7,857
Woori Bank Vietnam Limited
Disclosure of business combinations [Line Items]
Name of acquirer	Woori Bank
Name of acquiree	Woori Bank Vietnam Limited
Description of acquiree	The Group established Woori Bank Vietnam (capitalized at 3 trillion VND) in October 2016, upon the approval from Vietnam Central Bank and commenced its operation on January 3, 2017.
Date of acquisition	Oct-16
Description of primary reasons for business combination	The Group has been operating two branches in Hanoi and Ho Chi Minh, and newly established the subsidiary in order for further expansion of its retail banking business in Vietnam.
I. Consideration
Cash and Cash equivalents	₩ 155,400
II. Identifiable assets and liabilities
Loan and receivables	155,400
Sub-total	155,400
Fair value of identifiable net asset	₩ 155,400

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Subsequent Event Description of subsequent events after reporting periods (Details)	12 Months Ended
	Dec. 31, 2017
Disclosure of non-adjusting events after reporting period [Abstract]
Disclosure of nonadjusting events after reporting period	There have been no significant events between December 31, 2017 and the date of issuance of these consolidated financial statements which would require a change to or additional disclosure in the accounts.