10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

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

For the quarterly period ended September 30, 2018

or

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

For the transition period from ___________ to ___________

COMMISSION FILE NUMBER 001-12307

ZIONS BANCORPORATION, NATIONAL ASSOCIATION

(Exact name of registrant as specified in its charter)

UNITED STATES OF AMERICA	87-0189025
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
One South Main Salt Lake City, Utah	84133
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (801) 844-7637

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  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate 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  ý    No  ¨

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

Large accelerated filer	ý	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	¨
		Emerging growth company	¨

If an emerging growth company, 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. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Common Stock ($0.001 par value) outstanding at October 31, 2018 192,185,109 shares

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

Table of Contents

		Page
PART  I. FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited)	35
	Consolidated Balance Sheets	35
	Consolidated Statements of Income	36
	Consolidated Statements of Comprehensive Income	37
	Consolidated Statements of Changes in Shareholders’ Equity	38
	Consolidated Statements of Cash Flows	39
	Notes to Consolidated Financial Statements	40
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	3
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	77
Item 4.	Controls and Procedures	77
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	78
Item 1A.	Risk Factors	78
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	78
Item 6.	Exhibits	79
Signatures		80

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

PART I. FINANCIAL INFORMATION

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

FORWARD-LOOKING INFORMATION

This Quarterly Report on Form 10-Q includes forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. Statements in this Quarterly Report on Form 10-Q that are based on other than historical information, or that express the Bank’s expectations regarding future events or determinations, are forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements provide current expectations or forecasts of future events and include, among others:

• statements with respect to the beliefs, plans, objectives, goals, targets, commitments, designs, guidelines, expectations, anticipations, and future financial condition, results of operations and performance of Zions Bancorporation, National Association and its subsidiaries (collectively “Zions Bancorporation, N.A.,” “the Bank,” “we,” “our,” “us”); and

• statements preceded by, followed by, or that include the words “may,” “could,” “should,” “would,” “believe,” “anticipate,” “estimate,” “expect,” “intend,” “target,” “commit,” “design,” “plan,” “projects,” and the negative thereof and similar words and expressions.

Zions Bancorporation, National Association is the successor to the merger of Zions Bancorporation into ZB, N.A. on September 30, 2018. References to “Zions Bancorporation, N.A.,” “the Bank,” “we,” “our,” and “us” are intended to refer to Zions Bancorporation and its subsidiaries for periods prior to the merger and to Zions Bancorporation, National Association, and its subsidiaries for periods on and after the merger.

These forward-looking statements are not guarantees of future performance, nor should they be relied upon as representing management’s views as of any subsequent date. Forward-looking statements by their nature address matters that are, to different degrees, uncertain, including without limitation, future financial and operating results. Actual results may differ materially from those presented, either expressed or implied, including, but not limited to, those presented in Management’s Discussion and Analysis. Important risk factors that may cause such material differences include, but are not limited to:

• the Bank’s ability to successfully execute its business plans, manage its risks, and achieve its objectives, including its operating leverage goals and its capital plan;

• risks and uncertainties related to the ability to obtain shareholder and regulatory approvals, or the possibility that such approvals may be delayed;

• changes in local, national and international political and economic conditions, including without limitation the political and economic effects of the economic and fiscal imbalance in the United States (“U.S.”) and other countries, potential or actual downgrades in ratings of sovereign debt issued by the United States and other countries, and other major developments, including wars, military actions, and terrorist attacks;

• changes in financial and commodity market prices and conditions, either internationally, nationally or locally in areas in which the Bank conducts its operations, including without limitation rates of business formation and growth, commercial and residential real estate development, real estate prices, agricultural-related commodity prices, and oil and gas-related commodity prices;

• changes in markets for equity, fixed income, commercial paper and other securities, commodities, including availability, market liquidity levels, and pricing;

• any impairment of our goodwill or other intangibles, or any adjustment of valuation allowances on our deferred tax assets due to adverse changes in the economic environment, declining operations of the reporting unit, or a change to the corporate statutory tax rate or other similar changes if and as implemented by local and national governments, or other factors;

• changes in interest rates, the quality and composition of the loan and securities portfolios, demand for loan products, deposit flows and competition;

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

• the rate of change of the Bank’s interest-sensitive assets and liabilities relative to changes in benchmark interest rates;

• the impact of acquisitions, dispositions, and corporate restructurings;

• increases in the levels of losses, customer bankruptcies, bank failures, claims, and assessments;

• changes in fiscal, monetary, regulatory, trade and tax policies and laws, and regulatory assessments and fees, including policies of the United States Department of Treasury, the Office of the Comptroller of the Currency (“OCC”), the Board of Governors of the Federal Reserve System, the Federal Deposit Insurance Corporation (“FDIC”), the Securities and Exchange Commission, and the Consumer Financial Protection Bureau (“CFPB”);

• the impact of executive compensation rules under the Dodd-Frank Wall Street Reform and Consumer Protection Act (“Dodd-Frank Act”) and banking regulations, which may impact the ability of the Bank and other American financial institutions to retain and recruit executives and other personnel necessary for their businesses and competitiveness;

• the impact of the Dodd-Frank Act and Basel III, and rules and regulations thereunder, on our required regulatory capital and liquidity levels, governmental assessments on us, the scope of business activities in which we may engage, the manner in which we engage in such activities, the fees we may charge for certain products and services, and other matters affected by the Dodd-Frank Act and these international standards;

• new legal claims against the Bank, including litigation, arbitration and proceedings brought by governmental or self-regulatory agencies, or changes in existing legal matters;

• success in gaining regulatory approvals, when required;

• changes in consumer spending and savings habits;

• increased competitive challenges and expanding product and pricing pressures among financial institutions;

• economies of scale attendant to the development of digital and other technologies by much larger bank and non-bank competitors, and the possible entry of very large technology “platform” companies into the financial services business;

• inflation and deflation;

• the Bank’s implementation of new technologies;

• the Bank’s ability to develop and maintain secure and reliable information technology systems;

• legislation or regulatory changes which adversely affect the Bank’s operations or business;

• the Bank’s ability to comply with applicable laws and regulations;

• changes in accounting policies or procedures as may be required by the Financial Accounting Standards Board or regulatory agencies; and

• costs of deposit insurance and changes with respect to FDIC insurance coverage levels.

Except to the extent required by law, the Bank specifically disclaims any obligation to update any factors or to publicly announce the result of revisions to any of the forward-looking statements included herein to reflect future events or developments.

GLOSSARY OF ACRONYMS

ACL	Allowance for Credit Losses	ATM	Automated Teller Machine
AFS	Available-for-Sale	bps	basis points
ALCO	Asset/Liability Committee	CB&T	California Bank & Trust, a division of Zions Bancorporation, National Association
ALLL	Allowance for Loan and Lease Losses	CFPB	Consumer Financial Protection Bureau
Amegy	Amegy Bank, a division of Zions Bancorporation, National Association	CLTV	Combined Loan-to-Value Ratio
AOCI	Accumulated Other Comprehensive Income	CRE	Commercial Real Estate
ASC	Accounting Standards Codification	Dodd-Frank Act	Dodd-Frank Wall Street Reform and Consumer Protection Act
ASU	Accounting Standards Update	DTA	Deferred Tax Asset

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

EaR	Earnings at Risk	OREO	Other Real Estate Owned
ERM	Enterprise Risk Management	OTTI	Other-Than-Temporary Impairment
EVE	Economic Value of Equity at Risk	PAGA	Private Attorney General Act
FAMC	Federal Agricultural Mortgage Corporation, or “Farmer Mac”	PEI	Private Equity Investment
FDIC	Federal Deposit Insurance Corporation	PPNR	Pre-provision Net Revenue
FTP	Funds Transfer Pricing	ROC	Risk Oversight Committee
FHLB	Federal Home Loan Bank	RULC	Reserve for Unfunded Lending Commitments
FRB	Federal Reserve Board	S&P	Standard and Poor's
GAAP	Generally Accepted Accounting Principles	SBA	Small Business Administration
HECL	Home Equity Credit Line	SBIC	Small Business Investment Company
HTM	Held-to-Maturity	TARP	Troubled Asset Relief Program
IMG	International Manufacturing Group	TCBW	The Commerce Bank of Washington, a division of Zions Bancorporation, National Association
LIBOR	London Interbank Offered Rate	TDR	Troubled Debt Restructuring
Municipalities	State and Local Governments	Tier 1	Common Equity Tier 1 (Basel III)
NASDAQ	National Association of Securities Dealers Automated Quotations	Topic 606	ASC Topic 606, “Revenue from Contracts with Customers”
NBAZ	National Bank of Arizona, a division of Zions Bancorporation, National Association	U.S.	United States
NIM	Net Interest Margin	Vectra	Vectra Bank Colorado, a division of Zions Bancorporation, National Association
NSB	Nevada State Bank, a division of Zions Bancorporation, National Association	Zions Bancorporation, N.A.	Zions Bancorporation, National Association
OCC	Office of the Comptroller of the Currency	Zions Bank	Zions Bank, a division of Zions Bancorporation, National Association
OCI	Other Comprehensive Income

CRITICAL ACCOUNTING POLICIES AND SIGNIFICANT ESTIMATES

The Bank has made no significant changes in its critical accounting policies and significant estimates from those disclosed in its 2017 Annual Report on Form 10-K.

GAAP to NON-GAAP RECONCILIATIONS

This Form 10-Q presents non-GAAP financial measures, in addition to generally accepted accounting principles (“GAAP”) financial measures, to provide investors with additional information. The adjustments to reconcile from the applicable GAAP financial measures to the non-GAAP financial measures are presented in the following schedules. The Bank considers these adjustments to be relevant to ongoing operating results and provide a meaningful base for period-to-period and company-to-company comparisons. These non-GAAP financial measures are used by management to assess the performance and financial position of the Bank and for presentations of Bank performance to investors. The Bank further believes that presenting these non-GAAP financial measures will permit investors to assess the performance of the Bank on the same basis as that applied by management.

Non-GAAP financial measures have inherent limitations, and are not required to be uniformly applied by individual entities. Although non-GAAP financial measures are frequently used by stakeholders to evaluate a company, they have limitations as an analytical tool and should not be considered in isolation or as a substitute for analysis of results reported under GAAP.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

The following are non-GAAP financial measures presented in this Form 10-Q and a discussion of why management uses these non-GAAP measures:

Return on Average Tangible Common Equity – this schedule also includes “net earnings applicable to common shareholders, excluding the effects of the adjustment, net of tax” and “average tangible common equity.” Return on average tangible common equity is a non-GAAP financial measure that management believes provides useful information about the Bank’s use of shareholders’ equity. Management believes the use of ratios that utilize tangible equity provides additional useful information because they present measures of those assets that can generate income.

Tangible Equity Ratio, Tangible Common Equity Ratio, and Tangible Book Value per Common Share – this schedule also includes “tangible equity,” “tangible common equity,” and “tangible assets.” Tangible equity ratio, tangible common equity ratio, and tangible book value per common share are non-GAAP financial measures that management believes provides additional useful information about the levels of tangible assets and tangible equity between each other and in relation to outstanding shares of common stock. Management believes the use of ratios that utilize tangible equity provides additional useful information because they present measures of those assets that can generate income.

Efficiency Ratio – this schedule also includes “adjusted noninterest expense,” “taxable-equivalent net interest income,” “adjusted taxable-equivalent revenue,” and “adjusted pre-provision net revenue (“PPNR”).” The methodology of determining the efficiency ratio may differ among companies. Management makes adjustments to exclude certain items as identified in the subsequent schedule which it believes allows for more consistent comparability among periods. Management believes the efficiency ratio provides useful information regarding the cost of generating revenue. Adjusted noninterest expense provides a measure as to how well the Bank is managing its expenses, and adjusted PPNR enables management and others to assess the Bank’s ability to generate capital to cover credit losses through a credit cycle. Taxable-equivalent net interest income allows management to assess the comparability of revenue arising from both taxable and tax-exempt sources.

RETURN ON AVERAGE TANGIBLE COMMON EQUITY (NON-GAAP)

		Three Months Ended
(Dollar amounts in millions)		September 30, 2018			June 30, 2018			March 31, 2018			September 30, 2017
Net earnings applicable to common shareholders (GAAP)		$	215		$	187		$	231		$	152
Adjustment, net of tax:
Amortization of core deposit and other intangibles		—			—			—			1
Net earnings applicable to common shareholders, excluding the effects of the adjustment, net of tax (non-GAAP)	(a)	$	215		$	187		$	231		$	153
Average common equity (GAAP)		$	7,024		$	7,072		$	7,061		$	7,230
Average goodwill and intangibles		(1,015		)	(1,016		)	(1,016		)	(1,018		)
Average tangible common equity (non-GAAP)	(b)	$	6,009		$	6,056		$	6,045		$	6,212
Number of days in quarter	(c)	92			91			90			92
Number of days in year	(d)	365			365			365			365
Return on average tangible common equity (non-GAAP)	(a/b/c)*d	14.2		%	12.4		%	15.5		%	9.8		%

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

TANGIBLE EQUITY (NON-GAAP) AND TANGIBLE COMMON EQUITY (NON-GAAP)

(Dollar amounts in millions, except per share amounts)		September 30, 2018			June 30, 2018			March 31, 2018			September 30, 2017
Total shareholders’ equity (GAAP)		$	7,553		$	7,621		$	7,644		$	7,761
Goodwill and intangible		(1,015		)	(1,015		)	(1,016		)	(1,017		)
Tangible equity (non-GAAP)	(a)	6,538			6,606			6,628			6,744
Preferred stock		(566		)	(566		)	(566		)	(566		)
Tangible common equity (non-GAAP)	(b)	$	5,972		$	6,040		$	6,062		$	6,178
Total assets (GAAP)		$	66,731		$	66,457		$	66,481		$	65,564
Goodwill and intangible		(1,015		)	(1,015		)	(1,016		)	(1,017		)
Tangible assets (non-GAAP)	(c)	$	65,716		$	65,442		$	65,465		$	64,547
Common shares outstanding (thousands)	(d)	192,169			195,392			197,050			199,712
Tangible equity ratio (non-GAAP)	(a/c)	9.95		%	10.09		%	10.12		%	10.45		%
Tangible common equity ratio (non-GAAP)	(b/c)	9.09		%	9.23		%	9.26		%	9.57		%
Tangible book value per common share (non-GAAP)	(b/d)	$	31.08		$	30.91		$	30.76		$	30.93

EFFICIENCY RATIO (NON-GAAP) AND ADJUSTED PRE-PROVISION NET REVENUE (NON-GAAP)

(Dollar amounts in millions)		Three Months Ended									Nine Months Ended						Year Ended
		September 30, 2018			June 30, 2018			September 30, 2017			September 30, 2018			September 30, 2017			December 31, 2017
Noninterest expense (GAAP)	(a)	$	420		$	428		$	413		$	1,259		$	1,232		$	1,649
Adjustments:
Severance costs		2			1			1			1			6			7
Other real estate expense, net		1			—			(1		)	1			(1		)	(1		)
Provision for unfunded lending commitments		—			7			(4		)	—			(6		)	(7		)
Amortization of core deposit and other intangibles		—			—			2			1			5			6
Restructuring costs		1			—			1			1			3			4
Total adjustments	(b)	4			8			(1		)	4			7			9
Adjusted noninterest expense (non-GAAP)	(a-b)= (c)	$	416		$	420		$	414		$	1,255		$	1,225		$	1,640
Net interest income (GAAP)	(d)	$	565		$	548		$	522		$	1,654		$	1,539		$	2,065
Fully taxable-equivalent adjustments	(e)	5			5			9			16			26			35
Taxable-equivalent net interest income (non-GAAP)1	(d+e)=f	570			553			531			1,670			1,565			2,100
Noninterest income (GAAP)	g	136			138			139			412			404			544
Combined income (non-GAAP)	(f+g)= (h)	706			691			670			2,082			1,969			2,644
Adjustments:
Fair value and nonhedge derivative income (loss)		—			—			—			2			(1		)	(2		)
Securities gains (losses), net		(1		)	1			5			(1		)	13			14
Total adjustments	(i)	(1		)	1			5			1			12			12
Adjusted taxable-equivalent revenue (non-GAAP)	(h-i)= (j)	$	707		$	690		$	665		$	2,081		$	1,957		$	2,632
Pre-provision net revenue (PPNR)	(h)-(a)	$	286		$	263		$	257		$	823		$	737		$	995
Adjusted PPNR (non-GAAP)	(j-c)	291			270			251			826			732			992
Efficiency ratio (non-GAAP)	(c/j)	58.8		%	60.9		%	62.3		%	60.3		%	62.6		%	62.3		%

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

RESULTS OF OPERATIONS

Executive Summary

The Bank reported net earnings applicable to common shareholders of $215 million, or $1.04 per diluted common share for the third quarter of 2018, compared with net earnings applicable to common shareholders of $152 million, or $0.72 per diluted common share for the third quarter of 2017, and $187 million, or $0.89 per diluted common share for the second quarter of 2018. The financial performance in the third quarter of 2018 reflects strong net interest income, moderate customer-related fee income growth, progress on key initiatives, including expense control, continued strong credit quality; and modest linked-quarter loan growth.

Net income in the third quarter of 2018 increased from the third quarter of 2017 primarily due to a $43 million increase in net interest income, a $16 million decrease in the provision for loan losses, and a $14 million decrease in income taxes, partially offset by a $7 million increase in noninterest expense. The market value of the Bank’s Small Business Investment Company (“SBIC”) decreased by $7 million from the third quarter of 2017 to the third quarter of 2018.

Net interest income increased from the third quarter of 2017 to the third quarter of 2018 due to increases in short-term interest rates that positively impacted loan yields and growth in our lending portfolio, partially offset by an increase in interest expense. The provision for loan losses decreased from $5 million in the third quarter of 2017 to a provision of $(11) million in the third quarter of 2018 primarily due to continued credit quality improvement. When comparing the third quarter of 2018 to the third quarter of 2017, customer-related fees increased by 2%.

Highlights from the Third Quarter of 2018

Net interest income, which is more than three-quarters of our revenue, improved by $43 million from $522 million in the third quarter of 2017, and by $17 million from $548 million in the second quarter of 2018, to $565 million in the third quarter of 2018. The increase from both prior periods was due to increases in short-term interest rates that positively impacted loan yields and growth in consumer and commercial loans, partially offset by an increase in interest expense. Net Interest Margin (“NIM”) was 3.63% in the third quarter of 2018 compared with 3.45% in the third quarter of 2017 and 3.56% in the second quarter of 2018. For more discussion on the changes in net interest income and NIM, including the positive impact of interest income recoveries, see “Net Interest Income” and “Net Interest Margin and Interest Rate Spreads.”

Adjusted PPNR of $291 million for the third quarter of 2018 was up $40 million, or 16%, from the third quarter of 2017. The current year period included $3 million of interest income recoveries of at least $1 million per loan, while there were no such recoveries in the same prior year period. Adjusted for these interest income recoveries, the increase in adjusted PPNR would be 15%. The increase in PPNR reflects operating leverage improvement resulting from moderate loan growth and increases in short-term interest rates, partially offset by increased interest expense and noninterest expense primarily from increased salaries and employee benefits. See “Noninterest Expense” for a discussion regarding the increased salary and employee benefits expense. The Bank’s efficiency ratio was 58.8% in the third quarter of 2018 compared with 62.3% in the third quarter of 2017 and 60.9% in the second quarter of 2018. See “GAAP to Non-GAAP Reconciliations” on page 5 for more information regarding the calculation of adjusted PPNR.

Our average loan portfolio increased $1.5 billion, or 4%, since the third quarter of 2017. We have seen widespread growth across most products and geographies, with particular strength in 1-4 family residential, municipal, and owner-occupied lending. Term commercial real estate (“CRE”) loans continued to decline slightly from the prior year, reflecting heightened levels of payoffs and underwriting restraint in a highly competitive lending market.

Asset quality has continued to improve during the past several quarters. Credit quality in the oil and gas-related portfolio continues to strengthen and it has remained strong in the rest of the lending portfolio. Overall, from the third quarter of 2017 to the third quarter of 2018, criticized, classified, and nonaccrual loans declined by $585 million, $464 million, and $177 million, respectively.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

In a rising interest rate environment, our average noninterest-bearing demand deposits increased $0.4 billion from $23.6 billion in the second quarter of 2018 to $24.0 billion in the third quarter of 2018, and comprised approximately 45% of average total deposits for both the second and third quarters of 2018.

We continue to increase the return on- and of- capital. Return on average tangible common equity was 14.2% for the third quarter of 2018, up 440 basis points (“bps”) from the same prior year period. Our return on average assets increased by 36 bps during the same period. Regarding the return of capital, during the third quarter of 2018, the Bank repurchased 3.5 million shares of common stock for $185 million, which is equivalent to 1.8% of common stock outstanding as of June 30, 2018. During the last 12 months the Bank has repurchased a total of 10.1 million shares of common stock for $535 million, which is equivalent to 5.1% of common stock outstanding as of September 30, 2017. Dividends per common share were $0.30 in the third quarter of 2018, compared with $0.12 for the third quarter of 2017. In October 2018, the Bank announced that its board of directors declared a regular quarterly dividend of $0.30 per common share, payable November 21, 2018 to shareholders of record on November 14, 2018. Additionally, the Board approved a plan to repurchase $250 million of common shares during the fourth quarter of 2018. See “Capital Management” on page 32 for more information regarding the Bank’s capital plan.

On September 30, 2018, the Bank completed the merger of Zions Bancorporation, its former bank holding company, with, and into, the Bank formerly known as ZB, N.A., in order to further reduce organizational complexity. The restructuring eliminated the bank holding company structure and associated regulatory framework, and resulted in ZB, N.A. being renamed Zions Bancorporation, National Association and becoming the top-level entity within our corporate structure. The merger is expected to result in the elimination of duplicative regulatory efforts, leaving the OCC as the Bank’s primary regulator. As a result of the Financial Stability Oversight Council’s action on September 12, 2018 and the merger of the holding company on September 30, 2018, the Bank is no longer considered a systemically important financial institution under the Dodd-Frank Act. See “Capital Management” on page 32 for more information regarding the merger.

Areas of focus for 2018

In 2018, we are focused on ongoing initiatives related to Bank profitability, including returns on equity. Both our profitability and returns on equity have improved in the third quarter of 2018 when compared with the third quarter of 2017 and the second quarter of 2018. We continue to implement technology upgrades and process simplification to ensure current and future performance. See “Areas of focus for 2018” in our 2017 Annual Report on Form 10-K for a discussion of the major areas of emphasis in 2018.

Net Interest Income

Net interest income is the difference between interest earned on interest-earning assets and interest paid on interest-bearing liabilities. Net interest income increased to $565 million in the third quarter of 2018 from $522 million in the third quarter of 2017. The $43 million, or 8%, increase in net interest income was primarily due to a $69 million increase in interest and fees on loans, resulting from increases in short-term interest rates and loan growth in consumer and commercial loans, partially offset by an increase in interest expense. Interest income in the third quarter of 2018 was positively impacted by $3 million of interest income recoveries of at least $1 million per loan, while there were no such recoveries in the same prior year period. Adjusting for these interest income recoveries, net interest income would have increased by $40 million.

Interest expense increased $31 million from the third quarter of 2017 to the third quarter of 2018 due to a $23 million increase in interest on deposits due to higher rates paid and an $8 million increase in interest on short- and long-term borrowings. We have remained disciplined in our deposit pricing, as over the past twelve months the Federal Reserve has increased the overnight benchmark Federal Funds rate by 100 bps, while the rate paid on the Bank’s interest-bearing deposits increased 31 bps and the rate paid on total deposits increased 16 bps.

Net Interest Margin and Interest Rate Spreads

The NIM was 3.63% and 3.45% for the third quarters of 2018 and 2017, respectively, and 3.56% for the second quarter of 2018. Excluding the effect of the previously mentioned interest income recoveries and adjusting for the

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

effect of the change to the corporate tax rate on fully taxable-equivalent yields, the NIM would have been 3.61% for the third quarter of 2018 compared with 3.42% for the third quarter of 2017 and 3.55% for the second quarter of 2018. The NIM for the third quarter of 2018, compared with the same prior year period, benefited from the recent increases in short-term interest rates and deposit pricing discipline.

Average interest-earning assets increased $1.1 billion from the third quarter of 2017 to the third quarter of 2018, with average rates improving 39 bps. Adjusting for the same items as mentioned previously, the yield on interest-earning assets would have increased 40 bps from the same prior year period.

Average interest-bearing liabilities increased $1.0 billion in the third quarter of 2018 compared with the third quarter of 2017 as a result of increased interest-bearing deposits and long-term debt. During the third quarter of 2018 the Bank issued $500 million of senior long-term debt to fund some of its balance sheet growth. The average rate on interest-bearing liabilities increased 36 bps during from the third quarter of 2017 to the third quarter of 2018 due to rising interest rates and increased rates paid on deposits.

The average loan portfolio increased $1.5 billion, or 4%, between the third quarter of 2017 and the third quarter of 2018. Most of this growth was in 1-4 family residential, municipal, and owner-occupied loans. The average loan yield increased 44 bps over the same period, with increases in the average rates for commercial, CRE, and consumer loans of 52 bps, 55 bps, and 21 bps, respectively. Benchmark interest rates have increased several times beginning in the fourth quarter of 2015, which has had a positive impact on NIM and spreads, as our earning assets generally reprice quicker than our funding sources. A portion of our variable-rate loans were not affected by these changes primarily due to having longer reset frequencies, or because a substantial portion of our earning assets are tied to longer-term rate indices. The longer-term rates were impacted by a relatively flat yield curve during the last several quarters. We expect overall loan growth to be slightly to moderately increasing.

Average available-for-sale (“AFS”) securities balances decreased $0.6 billion from the third quarter of 2017 to the third quarter of 2018. Yields on average AFS securities increased slightly by 8 bps over the same period. The increased yield was a result of rising market interest rates on variable-rate and recently purchased fixed-rate agency mortgage-backed securities.

Average noninterest-bearing demand deposits provided us with low cost funding and comprised approximately 45% and 46% of average total deposits for the third quarters of 2018 and 2017, respectively. Average total deposits were $53.6 billion for the third quarter of 2018 compared with $51.9 billion for the third quarter of 2017. Average interest-bearing deposits were $29.6 billion in the third quarter of 2018, compared with $28.1 billion for the same prior year period, and the average rate paid increased 31 bps, which was generally a modest increase when compared with the industry. Although we consider a wide variety of sources when determining our funding needs, we benefit from access to deposits from a significant number of small to mid-sized business customers, particularly noninterest-bearing deposits, that provide us with a low cost of funds and have a positive impact on our NIM. Further information regarding deposit assumptions is discussed in “Interest Rate and Market Risk Management” on page 26.

Average short-term borrowings decreased $0.7 billion compared with the same prior year period and the average interest rate paid increased by 92 bps as a result of rising short-term interest rates. During the third quarter of 2018 we issued $500 million of senior long-term debt which reduced the need for short-term borrowing.

The rate paid on total deposits and interest-bearing liabilities increased 22 bps from 0.23% for the third quarter of 2017 to 0.45% for the third quarter of 2018. Also, the total cost of deposits for the third quarter of 2018 was 0.28%, compared with 0.12% for the third quarter of 2017. These increases were primarily due to increases in short-term interest rates.

The NIM was 3.59% and 3.45% for the first nine months of 2018 and 2017, respectively. The increase in the year-to-date NIM was also due to the recent increases in short-term interest rates and deposit pricing discipline.

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The spread on average interest-bearing funds was 3.29% and 3.26% for the third quarters of 2018 and 2017, respectively, and 3.29% and 3.28% for the first nine months of 2018 and 2017, respectively. The spread on average interest-bearing funds for these periods was affected by the same factors that had an impact on the NIM.

We expect the mix of interest-earning assets to continue to change over the next several quarters primarily due to growth in commercial loans, including municipal loans, and modest growth in CRE construction loans.

Interest rate spreads and margin are impacted by the mix of assets we hold, the composition of our loan and securities portfolios and the type of funding used. Assuming no additional increases in the Federal Funds rate or prepayment speeds of securities purchased at a premium, we expect the yield on the securities portfolio to increase slightly, as the cash flow from the portfolio is redeployed into securities with yields that are accretive to the overall portfolio.

Our estimates of the Bank’s interest rate risk position are highly dependent upon a number of assumptions regarding the repricing behavior of various deposit and loan types in response to changes in both short-term and long-term interest rates, balance sheet composition, and other modeling assumptions, as well as the actions of competitors and customers in response to those changes. Further detail on interest rate risk is discussed in “Interest Rate and Market Risk Management” on page 26.

The following schedule summarizes the average balances, the amount of interest earned or incurred, and the applicable yields for interest-earning assets and the costs of interest-bearing liabilities that generate taxable-equivalent net interest income.

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CONSOLIDATED AVERAGE BALANCE SHEETS, YIELDS AND RATES

(Unaudited)

	Three Months Ended September 30, 2018							Three Months Ended September 30, 2017
(Dollar amounts in millions)	Average balance			Amount of interest 1		Average yield/rate		Average balance			Amount of interest 1		Average yield/rate
ASSETS
Money market investments	$	1,327		$	8	2.25	%	$	1,246		$	5	1.44	%
Securities:
Held-to-maturity	848			7		3.52		750			7		3.96
Available-for-sale	14,592			81		2.20		15,197			81		2.12
Trading account	65			1		3.43		43			—		3.73
Total securities 2	15,505			89		2.28		15,990			88		2.21
Loans held for sale	53			1		4.82		52			1		4.29
Loans and leases 3
Commercial	23,263			286		4.88		22,261			245		4.36
Commercial real estate	11,009			139		5.01		11,192			126		4.46
Consumer	11,096			113		4.07		10,379			101		3.86
Total loans and leases	45,368			538		4.71		43,832			472		4.27
Total interest-earning assets	62,253			636		4.06		61,120			566		3.67
Cash and due from banks	516							767
Allowance for loan losses	(489		)					(540		)
Goodwill and intangibles	1,015							1,018
Other assets	3,079							2,974
Total assets	$	66,374						$	65,339
LIABILITIES AND SHAREHOLDERS’ EQUITY
Interest-bearing deposits:
Savings and money market	$	25,483		23		0.36	%	$	25,190		10		0.16	%
Time	4,118			15		1.49		2,933			5		0.70
Total interest-bearing deposits	29,601			38		0.52		28,123			15		0.21
Borrowed funds:
Federal funds purchased and other short-term borrowings	3,917			21		2.09		4,609			14		1.17
Long-term debt	572			7		4.91		383			6		5.71
Total borrowed funds	4,489			28		2.45		4,992			20		1.52
Total interest-bearing liabilities	34,090			66		0.77		33,115			35		0.41
Noninterest-bearing deposits	23,974							23,798
Total deposits 4 and interest-bearing liabilities	58,064			66		0.45		56,913			35		0.23
Other liabilities	720							630
Total liabilities	58,784							57,543
Shareholders’ equity:
Preferred equity	566							566
Common equity	7,024							7,230
Total shareholders’ equity	7,590							7,796
Total liabilities and shareholders’ equity	$	66,374						$	65,339
Spread on average interest-bearing funds						3.29	%						3.26	%
Taxable-equivalent net interest income and net yield on interest-earning assets				$	570	3.63	%				$	531	3.45	%

¹  Rates are calculated using amounts in thousands and taxable-equivalent rates used where applicable. The taxable-equivalent rates used are the rates that were applicable at the time of each respective reporting period.

²  Quarter-to-date interest on total securities includes $35 million and $34 million of taxable equivalent premium amortization, as of September 30, 2018 and September 30, 2017, respectively.

³  Net of unearned income and fees, net of related costs. Loans include nonaccrual and restructured loans.

⁴ The total cost of deposits, annualized, for September 30, 2018 and September 30, 2017 was 0.28% and 0.12%, respectively.

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	Nine Months Ended September 30, 2018							Nine Months Ended September 30, 2017
(Dollar amounts in millions)	Average balance			Amount of interest 1		Average yield/rate		Average balance			Amount of interest 1		Average yield/rate
ASSETS
Money market investments	$	1,379		$	20	1.98	%	$	1,598		$	14	1.15	%
Securities:
Held-to-maturity	806			22		3.55		795			23		3.94
Available-for-sale	14,760			240		2.17		14,873			236		2.12
Trading account	116			3		3.92		61			2		3.61
Total securities 2	15,682			265		2.26		15,729			261		2.22
Loans held for sale	59			2		4.31		95			2		3.42
Loans and leases 3
Commercial	23,193			825		4.75		21,920			712		4.34
Commercial real estate	11,049			403		4.88		11,222			377		4.49
Consumer	10,917			326		4.00		10,076			289		3.84
Total loans and leases	45,159			1,554		4.60		43,218			1,378		4.26
Total interest-earning assets	62,279			1,841		3.95		60,640			1,655		3.65
Cash and due from banks	551							844
Allowance for loan losses	(497		)					(551		)
Goodwill and intangibles	1,016							1,020
Other assets	3,066							2,967
Total assets	$	66,415						$	64,920
LIABILITIES AND SHAREHOLDERS’ EQUITY
Interest-bearing deposits:
Savings and money market	$	25,420		51		0.27	%	$	25,515		28		0.15	%
Time	3,738			36		1.27		2,946			15		0.65
Total interest-bearing deposits	29,158			87		0.40		28,461			43		0.20
Borrowed funds:
Federal funds purchased and other short-term borrowings	4,844			66		1.82		3,951			29		0.98
Long-term debt	447			18		5.42		428			18		5.81
Total borrowed funds	5,291			84		2.12		4,379			47		1.45
Total interest-bearing liabilities	34,449			171		0.66		32,840			90		0.37
Noninterest-bearing deposits	23,669							23,694
Total deposits 4 and interest-bearing liabilities	58,118			171		0.39		56,534			90		0.21
Other liabilities	679							609
Total liabilities	58,797							57,143
Shareholders’ equity:
Preferred equity	566							653
Common equity	7,052							7,124
Total shareholders’ equity	7,618							7,777
Total liabilities and shareholders’ equity	$	66,415						$	64,920
Spread on average interest-bearing funds						3.29	%						3.28	%
Taxable-equivalent net interest income and net yield on interest-earning assets				$	1,670	3.59	%				$	1,565	3.45	%

¹  Rates are calculated using amounts in thousands and taxable-equivalent rates used where applicable. The taxable-equivalent rates used are the rates that were applicable at the time of each respective reporting period.

²  Year-to-date interest on total securities includes $104 million and $101 million of taxable equivalent premium amortization, as of September 30, 2018 and September 30, 2017, respectively.

³  Net of unearned income and fees, net of related costs. Loans include nonaccrual and restructured loans.

⁴ The total cost of deposits, annualized, for September 30, 2018 and September 30, 2017 was 0.22% and 0.11%, respectively.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

Provision for Credit Losses

The provision for credit losses is the combination of both the provision for loan losses and the provision for unfunded lending commitments. Note 6 of our 2017 Annual Report on Form 10-K and “Credit Risk Management” on page 20 contains information on how we determine the appropriate level for the allowance for loan and lease losses (“ALLL”) and the reserve for unfunded lending commitments (“RULC”).

The provision for loan losses was $(11) million in the third quarter of 2018, compared with $5 million in both the same prior year period and the second quarter of 2018. The $(11) million provision primarily reflects net recoveries and ongoing improvements of credit quality metrics in the entire loan portfolio, partially offset by increases in qualitative adjustments mostly related to economic uncertainty arising from tariffs and their impact on trade. Asset quality during the third quarter of 2018 continued to improve for the entire loan portfolio when compared with the third quarter of 2017, primarily due to continued improvements in the oil and gas-related portfolio. Classified and nonaccrual loans in the total portfolio declined by $464 million and $177 million, respectively, from the third quarter of 2017. During the third quarter of 2018, there were net recoveries of $1 million, compared with net charge-offs of $8 million during the third quarter of 2017.

The provision for loan losses was $(46) million during the first nine months of 2018, compared with $35 million during the first nine months of 2017. This decrease was primarily as a result of the previously mentioned improving credit quality, particularly in the oil and gas-related portfolio, and net recoveries.

During the third quarter of 2018, we did not record a provision for unfunded lending commitments, compared with a $(4) million provision in the third quarter of 2017. This increase was due to increased unfunded lending commitments, partially offset by credit quality improvement in the oil and gas-related portfolio. From quarter to quarter, the provision for unfunded lending commitments may be subject to sizable fluctuations due to changes in the timing and volume of loan commitments, originations, fundings, and changes in credit quality.

The allowance for credit losses (“ACL”), which is the combination of both the ALLL and the RULC, decreased $62 million, when compared with the third quarter of 2017. This was mainly due to the credit quality improvements described previously.

Noninterest Income

Noninterest income represents revenues we earn for products and services that have no associated interest rate or yield. We believe a subtotal of customer-related fees provides a better view of income over which we have more direct control. It excludes items such as dividends, insurance-related income, mark-to-market adjustments on certain derivatives, and securities gains and losses. For the third quarter of 2018, noninterest income decreased $3 million, or 2%, compared with the third quarter of 2017, primarily due to a $6 million decrease in net securities gains. The following schedule presents a comparison of the major components of noninterest income.

NONINTEREST INCOME

	Three Months Ended September 30,					Amount change			Percent change		Nine Months Ended September 30,					Amount change			Percent change
(Dollar amounts in millions)	2018			2017							2018			2017
Service charges and fees on deposit accounts	$	42		$	42	$	—		—	%	$	125		$	127	$	(2	)	(2	)%
Other service charges, commissions and fees	59			55		4			7		168			160		8			5
Wealth management and trust income	12			11		1			9		38			30		8			27
Loan sales and servicing income	5			6		(1		)	(17	)	18			19		(1		)	(5	)
Capital markets and foreign exchange	7			8		(1		)	(13	)	23			21		2			10
Customer-related fees	125			122		3			2		372			357		15			4
Dividends and other investment income	11			9		2			22		34			31		3			10
Securities gains (losses), net	(1		)	5		(6		)	(120	)	(1		)	13		(14		)	(108	)
Other	1			3		(2		)	(67	)	7			3		4			133
Total noninterest income	$	136		$	139	$	(3	)	(2	)	$	412		$	404	$	8		2

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

In the third quarter of 2017 the Bank’s SBIC investments increased in market value compared with a slight decline in market value in the third quarter of 2018. This decrease in noninterest income was partially offset by a $3 million, or 2%, increase in customer-related fees, primarily related to increased loan syndication fees, bankcard fees, corporate investment services and wealth management income. Improvements in platform and product simplifications contributed to this increase. We have experienced a decrease in mortgage fees due to higher interest rates resulting in lower origination and mortgage-related activity.

Customer-related fees increased $15 million, or 4% from the first nine months of 2017 to the first nine months of 2018. This increase was a result of the same factors as the increase from the third quarter of 2017 to the third quarter of 2018. Relative to third quarter of 2018 results, we expect customer-related fees to increase slightly over the next twelve months.

Noninterest Expense

Noninterest expense increased by $7 million, or 2%, from the third quarter of 2017 to the third quarter of 2018. The Bank remains focused on expense control efforts, while continuing to invest in technology and simplification initiatives. This 2% increase is within our targeted growth rate of low single-digit percentage range relative to the prior year.

The following schedule presents a comparison of the major components of noninterest expense.

NONINTEREST EXPENSE

	Three Months Ended September 30,					Amount change			Percent change		Nine Months Ended September 30,					Amount change			Percent change
(Dollar amounts in millions)	2018		2017								2018		2017
Salaries and employee benefits	$	264	$	251		$	13		5	%	$	800	$	753		$	47		6	%
Occupancy, net	33		35			(2		)	(6	)	96		101			(5		)	(5	)
Furniture, equipment and software, net	30		32			(2		)	(6	)	95		96			(1		)	(1	)
Other real estate expense, net	1		(1		)	2			200		1		(1		)	2			200
Credit-related expense	5		7			(2		)	(29	)	19		23			(4		)	(17	)
Provision for unfunded lending commitments	—		(4		)	4			100		—		(6		)	6			100
Professional and legal services	12		15			(3		)	(20	)	37		43			(6		)	(14	)
Advertising	8		6			2			33		20		17			3			18
FDIC premiums	18		15			3			20		44		40			4			10
Other	49		57			(8		)	(14	)	147		166			(19		)	(11	)
Total noninterest expense	$	420	$	413		$	7		2		$	1,259	$	1,232		$	27		2
Adjusted noninterest expense 1	$	416	$	414		$	2		—		$	1,255	$	1,225		$	30		2

¹ For information on non-GAAP financial measures see “GAAP to Non-GAAP Reconciliations” on page 5

Salary and employee benefits expense was up $13 million in the third quarter of 2018 compared with the third quarter of 2017 primarily due to an $8 million increase in base salaries due to increased headcount and annual merit increases and a $2 million increase in incentive compensation. The provision for unfunded lending commitments increased by $4 million, primarily due to increased unfunded lending commitments that was partially offset by credit quality improvement in the oil and gas-related portfolio. For further information see “Provision for Credit Losses” on page 14. FDIC premiums increased due to a $4 million expense in the third quarter of 2018 that represents the cumulative effect of an adjustment related to the estimated uninsured deposits since the consolidation of bank charters. These increases in noninterest expense were partially offset by a $8 million decrease in other noninterest expense, primarily due to reduced operational losses, lower regulatory fees, and other miscellaneous expenses in the third quarter of 2018.

Net occupancy decreased by $5 million from the first nine months of 2017 to the first nine months of 2018 as additional rental income was received on a newly constructed building in Houston. Over the same year-to-date period, credit-related fees decreased by $4 million as a result of lower fees related to repossessions and professional and legal services decreased by $6 million as a result of a decrease in consulting fees. Other changes between the

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

first nine months of 2018 and 2017 are due to the same factors as for the changes between the third quarters of 2018 and 2017.

In October 2018, the Bank decided to terminate its pension plan subject to obtaining necessary regulatory approval. Completion of this termination is expected in early 2020. Plan participant benefits will not be disadvantaged because of this decision. At the time of final liquidation additional noninterest expense will be recognized for pension amounts remaining in other comprehensive income (“OCI”), as well as expense related to purchasing annuities for participants who elect that distribution method. The qualified pension OCI balance at September 30, 2018 was a $28 million loss before adjusting for tax effects. The expense related to purchasing annuities is highly dependent on individual participant elections between lump-sum distribution options and an annuity option, in addition to market competitiveness in the annuity bid process. The current estimate of this expense is $5 to $15 million, and is subject to change depending upon the previously mentioned factors.

Adjusted noninterest expense for the third quarter of 2018 increased $2 million, or less than 1%, to $416 million, compared with $414 million for the same prior year period. To arrive at adjusted noninterest expense, GAAP noninterest expense is adjusted to exclude certain expense items, which are the same as those items excluded in arriving at the efficiency ratio (see “GAAP to Non-GAAP Reconciliations” on page 5 for more information regarding the calculation of the efficiency ratio). Adjusted noninterest expense for the first nine months of 2018 increased by 2% from the first nine months of 2017 and we still expect adjusted noninterest expense for 2018 to experience an increase in the low single-digit percentage range relative to the prior year.

Income Taxes

Income tax expense for the third quarter of 2018 was $69 million compared with $83 million for the same prior year period. The effective income tax rates were 23.6% and 34.2% for the third quarters of 2018 and 2017, respectively. Income tax expense for the first nine months of 2018 was $195 million compared with $207 million for the first nine months of 2017. The effective tax rates for these year-to-date periods were 22.9% and 30.6%, respectively. Note 12 of the Notes to Consolidated Financial Statements contains additional information about the factors that influenced the income tax rates and information about deferred income tax assets and liabilities. The effective tax rate for 2018 is expected to be approximately 23%, including the effects of stock-based compensation.

Preferred Dividends

Preferred dividends were $8 million during both the third quarter of 2018 and the third quarter of 2017. Preferred dividends for the first nine months of 2018 decreased by $5 million compared with the first nine months of 2017. This decrease was a result of our redemption of all outstanding shares of our 7.9% Series F preferred stock during the third quarter of 2017. The total one-time reduction to net earnings applicable to common shareholders associated with the preferred stock redemption was $3 million.

BALANCE SHEET ANALYSIS

Interest-Earning Assets

Interest-earning assets are those assets that have interest rates or yields associated with them. One of our goals is to maintain a high level of interest-earning assets relative to total assets while keeping nonearning assets at a minimum. Interest-earning assets consist of money market investments, securities, loans, and leases.

Another goal is to maintain a higher-yielding mix of interest-earning assets, such as loans, relative to lower-yielding assets, while maintaining adequate levels of highly liquid assets. As a result of this goal we redeployed funds from lower-yielding money market investments, in addition to using wholesale borrowings, to purchase agency securities.

For information regarding the average balances of our interest-earning assets, the amount of revenue generated by them, and their respective yields, see the average balance sheet on page 12.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

Average interest-earning assets were $62.3 billion for the first nine months of 2018, compared with $60.6 billion for the first nine months of 2017. Average interest-earning assets as a percentage of total average assets for the first nine months of 2018 and 2017 were 94% and 93%, respectively.

Average loans were $45.2 billion and $43.2 billion for the first nine months of 2018 and 2017, respectively. Average loans as a percentage of total average assets for the first nine months of 2018 were 68%, compared with 67% in the same prior year period.

Average money market investments, consisting of interest-bearing deposits, federal funds sold, and security resell agreements, decreased by 14% to $1.4 billion for the first nine months of 2018, compared with $1.6 billion for the first nine months of 2017. Average securities remained stable for the first nine months of 2018, compared with the first nine months of 2017.

Investment Securities Portfolio

We invest in securities to actively manage liquidity and interest rate risk, in addition to generating revenue for the Bank. Refer to the “Liquidity Risk Management” section on page 30 for additional information on management of liquidity and funding. The following schedule presents a profile of our investment securities portfolio. The amortized cost amounts represent the original cost of the investments, adjusted for related accumulated amortization or accretion of any yield adjustments, and for impairment losses, including credit-related impairment. The estimated fair value measurement levels and methodology are discussed in Note 3of our 2017 Annual Report on Form 10-K.

INVESTMENT SECURITIES PORTFOLIO

	September 30, 2018						December 31, 2017
(In millions)	Par value		Amortized cost		Estimated fair value		Par value		Amortized cost		Estimated fair value
Held-to-maturity
Municipal securities	$	751	$	751	$	734	$	771	$	770	$	762
Available-for-sale
U.S. Treasury securities	25		25		25		25		25		25
U.S. Government agencies and corporations:
Agency securities	1,482		1,480		1,448		1,830		1,830		1,818
Agency guaranteed mortgage-backed securities	10,004		10,159		9,824		9,605		9,798		9,666
Small Business Administration loan-backed securities	1,888		2,069		2,020		2,007		2,227		2,222
Municipal securities	1,182		1,313		1,284		1,193		1,336		1,334
Other debt securities	25		25		24		25		25		24
Total available-for-sale debt securities	14,606		15,071		14,625		14,685		15,241		15,089
Money market mutual funds and other	—		—		—		72		72		72
Total available-for-sale	14,606		15,071		14,625		14,757		15,313		15,161
Total	$	15,357	$	15,822	$	15,359	$	15,528	$	16,083	$	15,923

The amortized cost of investment securities at September 30, 2018 decreased by 2% from the balances at December 31, 2017.

The investment securities portfolio includes $465 million of net premium that is distributed across various asset classes as illustrated in the preceding schedule. The purchase premiums and discounts for both held-to-maturity (“HTM”) and AFS securities are amortized and accreted at a constant effective yield to the contractual maturity date and no assumption is made concerning prepayments. As principal prepayments occur, the portion of the unamortized premium or discount associated with the principal reduction is recognized as interest income in the period the principal is reduced. For the nine months ended September 30, 2018, premium amortization reduced the yield on securities by 94 bps compared with a 90 bps impact for the same period in 2017.

As of September 30, 2018, under the GAAP fair value accounting hierarchy, 0.2% of the $14.6 billion fair value of the AFS securities portfolio was valued at Level 1, 99.8% was valued at Level 2, and there were no Level 3 AFS

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

securities. At December 31, 2017, 1% of the $15.2 billion fair value of AFS securities portfolio was valued at Level 1, 99% was valued at Level 2, and there were no Level 3 AFS securities. See Note 3 of our 2017 Annual Report on Form 10-K for further discussion of fair value accounting.

Exposure to State and Local Governments

We provide multiple products and services to state and local governments (referred to collectively as “municipalities”), including deposit services, loans, and investment banking services, and we invest in securities issued by the municipalities.

The following schedule summarizes our exposure to state and local municipalities:

MUNICIPALITIES

(In millions)	September 30, 2018		December 31, 2017
Loans and leases	$	1,563	$	1,271
Held-to-maturity – municipal securities	751		770
Available-for-sale – municipal securities	1,285		1,334
Trading account – municipal securities	47		146
Unfunded lending commitments	147		152
Total direct exposure to municipalities	$	3,793	$	3,673

At September 30, 2018, one municipal loan with a balance of $1 million was on nonaccrual. A significant amount of the municipal loan and lease portfolio is secured by real estate and equipment, and 78% of the outstanding loans and leases were originated by California Bank & Trust (“CB&T”), Zions Bank, and Vectra Bank Colorado (“Vectra”). See Note 6 of the Notes to Consolidated Financial Statements for additional information about the credit quality of these municipal loans.

Foreign Exposure and Operations

Our credit exposure to foreign sovereign risks and total foreign credit exposure is not significant. We also do not have significant foreign exposure to derivative counterparties. We had no foreign deposits at September 30, 2018 and December 31, 2017.

Loan Portfolio

For the first nine months of 2018 and 2017, average loans accounted for 68% and 67%, respectively, of total average assets. As presented in the following schedule, the largest category was commercial and industrial loans, which constituted 31% of our loan portfolio at September 30, 2018.

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LOAN PORTFOLIO

	September 30, 2018				December 31, 2017
(Dollar amounts in millions)	Amount		% of total loans		Amount		% of total loans
Commercial:
Commercial and industrial	$	14,096	31	%	$	14,003	31	%
Leasing	332		1		364		1
Owner-occupied	7,548		17		7,288		16
Municipal	1,563		3		1,271		3
Total commercial	23,539		52		22,926		51
Commercial real estate:
Construction and land development	2,295		5		2,021		5
Term	8,752		19		9,103		20
Total commercial real estate	11,047		24		11,124		25
Consumer:
Home equity credit line	2,884		6		2,777		6
1-4 family residential	7,039		16		6,662		15
Construction and other consumer real estate	644		1		597		1
Bankcard and other revolving plans	483		1		509		1
Other	174		—		185		1
Total consumer	11,224		24		10,730		24
Total net loans	$	45,810	100	%	$	44,780	100	%

Loan portfolio growth during the first nine months of 2018 was widespread across loan products and geographies with particular strength in 1-4 family residential, municipal, construction and land development, and owner-occupied loans. The impact of these increases was partially offset by a decrease in the CRE term portfolio.

Commercial owner-occupied loans increased during the first nine months of 2018; however, we experienced continued runoff and attrition of the National Real Estate portfolio. The National Real Estate business is a wholesale business that depends on loan referrals from other community banking institutions. Due to generally soft loan demand nationally, many community banking institutions are retaining, rather than selling, their loan production.

Other Noninterest-Bearing Investments

During the first nine months of 2018, the Bank decreased its short-term borrowings with the Federal Home Loan Bank (“FHLB”) by $700 million. This decrease also led to a decline in FHLB activity stock, which consequently decreased by $28 million during the year. Aside from this decrease, other noninterest-bearing investments remained relatively stable as set forth in the following schedule.

OTHER NONINTEREST-BEARING INVESTMENTS

(In millions)	September 30, 2018		December 31, 2017
Bank-owned life insurance	$	516	$	506
Federal Home Loan Bank stock	126		154
Federal Reserve stock	185		184
Farmer Mac stock	52		43
SBIC investments	134		127
Non-SBIC investment funds	11		12
Other	3		3
Total other noninterest-bearing investments	$	1,027	$	1,029

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Premises, Equipment, and Software

Net premises, equipment, and software increased $17 million, or 1.6%, during the first nine months of 2018. The Bank continues to capitalize certain costs related to its technology initiatives, but associated depreciation has also increased approximately $2 million per quarter following the successful implementation, in 2017, of the first phase of our core lending and deposit systems replacement project, which replaced the Bank’s primary consumer lending systems. The second phase of the project, which replaces the Bank’s primary commercial lending systems, is expected to be complete in the first half of 2019. The third phase would replace the Bank’s deposit systems, and is still in the preliminary stages of development and a decision to move forward with this phase will be made in the first half of 2019. The total core replacement project spend amount is comprised of both capitalized amounts and amounts that are expensed as incurred. The useful life for most of the capitalized costs is 10 years. The following schedule shows the total amount of costs capitalized by phase for the core replacement project.

	September 30, 2018
(In millions)	Phase 1		Phase 2		Phase 3		Total
Core replacement project costs
Total amount capitalized	$	78	$	70	$	30	$	178

Deposits

Deposits, both interest-bearing and noninterest-bearing, are a primary source of funding for the Bank. Average total deposits for the first nine months of 2018 increased by 1.3%, compared with the first nine months of 2017, with average interest-bearing deposits increasing by 2.4% and average noninterest-bearing deposits decreasing by 0.1%. The average interest rate paid for interest-bearing deposits was 20 bps higher during the first nine months of 2018, compared with the first nine months of 2017.

Demand and savings and money market deposits were 92% and 94% of total deposits at September 30, 2018 and December 31, 2017, respectively. At September 30, 2018 and December 31, 2017, total deposits included $2.3 billion and $1.6 billion, respectively, of brokered deposits.

See “Liquidity Risk Management” on page 30 for additional information on funding and borrowed funds.

RISK ELEMENTS

Since risk is inherent in substantially all of the Bank’s operations, management of risk is an integral part of its operations and is also a key determinant of its overall performance. The Board of Directors has appointed a Risk Oversight Committee (“ROC”) that consists of appointed Board members who oversee the Bank’s risk management processes. The ROC meets on a regular basis to monitor and review Enterprise Risk Management (“ERM”) activities. As required by its charter, the ROC performs oversight for various ERM activities and approves ERM policies and activities as detailed in the ROC charter.

Management applies various strategies to reduce the risks to which the Bank’s operations are exposed, including credit, interest rate and market, liquidity, and operational risks. These risks are overseen by the various management committees of which the Enterprise Risk Management Committee is the focal point for the monitoring and review of enterprise risk.

Credit Risk Management

Credit risk is the possibility of loss from the failure of a borrower, guarantor, or another obligor to fully perform under the terms of a credit-related contract. Credit risk arises primarily from our lending activities, as well as from off-balance sheet credit instruments. For a more comprehensive discussion of credit risk management, see “Credit Risk Management” in our 2017 Annual Report on Form 10-K.

Government Agency Guaranteed Loans

We participate in various guaranteed lending programs sponsored by U.S. government agencies, such as the Small Business Administration (“SBA”), Federal Housing Authority, Veterans’ Administration, Export-Import Bank of the

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U.S., and the U.S. Department of Agriculture. As of September 30, 2018, the principal balance of these loans was $565 million, and the guaranteed portion of these loans was $429 million. Most of these loans were guaranteed by the SBA.

The following schedule presents the composition of government agency guaranteed loans.

GOVERNMENT GUARANTEES

(Dollar amounts in millions)	September 30, 2018		Percent guaranteed		December 31, 2017		Percent guaranteed
Commercial	$	544	76	%	$	507	75	%
Commercial real estate	13		77		14		75
Consumer	8		100		16		92
Total loans	$	565	76		$	537	76

Commercial Lending

The following schedule provides selected information regarding lending concentrations to certain industries in our commercial lending portfolio.

COMMERCIAL LENDING BY INDUSTRY GROUP

	September 30, 2018				December 31, 2017
(Dollar amounts in millions)	Amount		Percent		Amount		Percent
Real estate, rental and leasing	$	2,563	11	%	$	2,807	12	%
Retail trade 1	2,403		10		2,257		10
Manufacturing	2,178		9		2,116		9
Finance and insurance	1,910		8		2,026		9
Healthcare and social assistance	1,648		7		1,556		7
Wholesale trade	1,573		7		1,543		7
Transportation and warehousing	1,332		6		1,343		6
Construction	1,227		5		1,094		5
Mining, quarrying, and oil and gas extraction	1,144		5		1,010		4
Utilities2	1,015		4		905		4
Hospitality and food services	953		4		932		4
Other Services (except Public Administration)	890		4		896		4
Professional, scientific, and technical services	858		4		879		4
Other 3	3,845		16		3,562		15
Total	$	23,539	100	%	$	22,926	100	%

¹  At September 30, 2018, 84% of retail trade consist of motor vehicle and parts dealers, gas stations, grocery stores, building material suppliers, and direct-to-consumer retailers.

²  Includes primarily utilities, power, and renewable energy.

³  No other industry group exceeds 3.5%.

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Commercial Real Estate Loans

Selected information indicative of credit quality regarding our CRE loan portfolio is presented in the following schedule.

COMMERCIAL REAL ESTATE PORTFOLIO BY LOAN TYPE AND COLLATERAL LOCATION

(Dollar amounts in millions)		Collateral Location
Loan type	As of date	Arizona			California			Colorado			Nevada			Texas			Utah/ Idaho			Wash-ington			Other 1			Total			% of  total CRE
Commercial term
Balance outstanding	9/30/2018	$	1,109		$	2,874		$	496		$	562		$	1,429		$	1,393		$	395		$	494		$	8,752		79.2	%
% of loan type		12.7		%	32.9		%	5.7		%	6.4		%	16.3		%	15.9		%	4.5		%	5.6		%	100.0		%
Delinquency rates 2:
30-89 days	9/30/2018	—		%	0.1		%	0.4		%	—		%	0.8		%	0.1		%	—		%	—		%	0.2		%
	12/31/2017	0.2		%	0.1		%	0.1		%	0.2		%	—		%	0.2		%	—		%	0.8		%	0.1		%
≥ 90 days	9/30/2018	—		%	0.1		%	0.4		%	—		%	0.1		%	0.1		%	—		%	—		%	0.1		%
	12/31/2017	0.2		%	0.1		%	0.1		%	—		%	—		%	0.1		%	—		%	0.7		%	0.1		%
Accruing loans past due 90 days or more	9/30/2018	$	—		$	1		$	2		$	—		$	—		$	—		$	—		$	—		$	3
	12/31/2017	1			1			—			—			—			—			—			—			2
Nonaccrual loans	9/30/2018	$	2		$	9		$	—		$	—		$	13		$	5		$	—		$	17		$	46
	12/31/2017	4			7			1			2			17			1			—			4			36
Residential construction and land development
Balance outstanding	9/30/2018	$	39		$	316		$	71		$	3		$	202		$	51		$	2		$	4		$	688		6.2	%
% of loan type		5.7		%	45.9		%	10.3		%	0.4		%	29.4		%	7.4		%	0.3		%	0.6		%	100.0		%
Delinquency rates 2:
30-89 days	9/30/2018	—		%	—		%	—		%	—		%	—		%	—		%	—		%	—		%	—		%
	12/31/2017	—		%	—		%	0.2		%	—		%	0.7		%	—		%	—		%	—		%	0.2		%
≥ 90 days	9/30/2018	—		%	—		%	—		%	—		%	—		%	—		%	—		%	—		%	—		%
	12/31/2017	—		%	—		%	—		%	—		%	0.1		%	—		%	—		%	—		%	—		%
Accruing loans past due 90 days or more	9/30/2018	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—
	12/31/2017	—			—			—			—			—			—			—			—			—
Nonaccrual loans	9/30/2018	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—
	12/31/2017	—			—			—			—			—			—			—			—			—
Commercial construction and land development
Balance outstanding	9/30/2018	$	202		$	273		$	54		$	82		$	457		$	373		$	131		$	35		$	1,607		14.6	%
% of loan type		12.5		%	17.0		%	3.4		%	5.1		%	28.4		%	23.2		%	8.2		%	2.2		%	100.0		%
Delinquency rates 2:
30-89 days	9/30/2018	—		%	—		%	—		%	—		%	—		%	—		%	—		%	—		%	—		%
	12/31/2017	0.1		%	0.2		%	—		%	—		%	0.2		%	0.1		%	—		%	—		%	0.1		%
≥ 90 days	9/30/2018	—		%	—		%	—		%	—		%	—		%	—		%	—		%	—		%	—		%
	12/31/2017	—		%	—		%	—		%	—		%	—		%	1.3		%	—		%	—		%	0.3		%
Accruing loans past due 90 days or more	9/30/2018	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—
	12/31/2017	—			—			—			—			—			—			—			—			—
Nonaccrual loans	9/30/2018	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—
	12/31/2017	—			—			—			—			—			4			—			—			4
Total construction and land development	9/30/2018	$	241		$	589		$	125		$	85		$	659		$	424		$	133		$	39		$	2,295
Total commercial real estate	9/30/2018	$	1,350		$	3,463		$	621		$	647		$	2,088		$	1,817		$	528		$	533		$	11,047		100.0	%

¹  No other geography exceeds $91 million for all three loan types.

²  Delinquency rates include nonaccrual loans.

Approximately 15% of the CRE term loans consist of mini-perm loans as of September 30, 2018. For such loans, construction has been completed and the project has stabilized to a level that supports the granting of a mini-perm loan in accordance with our underwriting standards. Mini-perm loans generally have initial maturities of three to

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seven years. The remaining 85% of CRE loans are term loans with initial maturities generally of 5 to 20 years. The stabilization criteria for a project to qualify for a term loan differ by product type and include criteria related to the cash flow generated by the project, loan-to-value ratio, and occupancy rates.

Approximately $172 million, or 11%, of the commercial construction and land development portfolio at September 30, 2018 consists of acquisition and development loans. Most of these acquisition and development loans are secured by specific retail, apartment, office, or other projects.

For a more comprehensive discussion of commercial real estate loans, see the “Commercial Real Estate Loans” section in our 2017 Annual Report on Form 10-K.

Consumer Loans

We have mainly been an originator of first and second mortgages, generally considered to be of prime quality. We generally hold variable-rate loans in our portfolio and sell “conforming” fixed-rate loans to third parties, including Federal National Mortgage Association and Federal Home Loan Mortgage Corporation, for which we make representations and warranties that the loans meet certain underwriting and collateral documentation standards.

We are also engaged in Home Equity Credit Line (“HECL”) lending. At September 30, 2018 and December 31, 2017, our HECL portfolio totaled $2.9 billion and $2.8 billion, respectively. The following schedule describes the composition of our HECL portfolio by lien status.

HECL PORTFOLIO BY LIEN STATUS

(In millions)	September 30, 2018		December 31, 2017
Secured by first deeds of trust	$	1,455	$	1,406
Secured by second (or junior) liens	1,429		1,371
Total	$	2,884	$	2,777

At September 30, 2018, loans representing less than 1% of the outstanding balance in the HECL portfolio were estimated to have combined loan-to-value ratios (“CLTV”) above 100%. An estimated CLTV ratio is the ratio of our loan plus any prior lien amounts divided by the estimated current collateral value. At origination, underwriting standards for the HECL portfolio generally include a maximum 80% CLTV with high credit scores at origination.

Approximately 91% of our HECL portfolio is still in the draw period, and approximately 24% of those loans are scheduled to begin amortizing within the next five years. We regularly analyze the risk of borrower default in the event of a loan becoming fully amortizing and the risk of higher interest rates. The analysis indicates that the risk of loss from this factor is minimal in the current economic environment. The ratio of net charge-offs to average balances for the first nine months of 2018 and 2017 for the HECL portfolio was (0.02)% and (0.01)%, respectively. See Note 6 of the Notes to Consolidated Financial Statements for additional information on the credit quality of this portfolio.

Nonperforming Assets

Nonperforming assets as a percentage of loans and leases and other real estate owned (“OREO”) decreased to 0.64% at September 30, 2018, compared with 0.93% at December 31, 2017.

Total nonaccrual loans at September 30, 2018 decreased $126 million from December 31, 2017, primarily in the commercial and industrial loan portfolio. However, nonaccrual loans slightly increased in the commercial real estate term loan portfolio. The largest total decrease in nonaccrual loans occurred at Amegy Bank (“Amegy”), mainly due to improvements in the oil and gas-related portfolio.

The balance of nonaccrual loans can decrease due to paydowns, charge-offs, and the return of loans to accrual status under certain conditions. If a nonaccrual loan is refinanced or restructured, the new note is immediately placed on nonaccrual. If a restructured loan performs under the new terms for at least a period of six months, the loan can be considered for return to accrual status. See “Restructured Loans” following for more information. Bank policy does

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not allow for the conversion of nonaccrual construction and land development loans to CRE term loans. See Note 6 of the Notes to Consolidated Financial Statements for more information on nonaccrual loans.

The following schedule sets forth our nonperforming assets:

NONPERFORMING ASSETS

(Dollar amounts in millions)	September 30, 2018			December 31, 2017
Nonaccrual loans 1	$	288		$	414
Other real estate owned	4			4
Total nonperforming assets	$	292		$	418
Ratio of nonperforming assets to net loans and leases1 and other real estate owned	0.64		%	0.93		%
Accruing loans past due 90 days or more	$	12		$	22
Ratio of accruing loans past due 90 days or more to loans and leases1	0.03		%	0.05		%
Nonaccrual loans and accruing loans past due 90 days or more	$	300		$	436
Ratio of nonaccrual loans and accruing loans past due 90 days or more to loans and leases1	0.65		%	0.97		%
Accruing loans past due 30-89 days	$	87		$	120
Nonaccrual loans1 current as to principal and interest payments	57.4		%	65.9		%

¹ Includes loans held for sale.

Restructured Loans

Troubled debt restructurings (“TDRs”) are loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for whom we have granted a concession that we would not otherwise consider. TDRs decreased $22 million, or 10%, during the first nine months of 2018. Commercial loans may be modified to provide the borrower more time to complete the project, to achieve a higher lease-up percentage, to sell the property, or for other reasons. Consumer loan TDRs represent loan modifications in which a concession has been granted to the borrower who is unable to refinance the loan with another lender, or who is experiencing economic hardship. Such consumer loan TDRs may include first-lien residential mortgage loans and home equity loans.

If the restructured loan performs for at least six months according to the modified terms, and an analysis of the customer’s financial condition indicates that we are reasonably assured of repayment of the modified principal and interest, the loan may be returned to accrual status. The borrower’s payment performance prior to and following the restructuring is taken into account to determine whether a loan should be returned to accrual status.

ACCRUING AND NONACCRUING TROUBLED DEBT RESTRUCTURED LOANS

(In millions)	September 30, 2018		December 31, 2017
Restructured loans – accruing	$	114	$	139
Restructured loans – nonaccruing	90		87
Total	$	204	$	226

In the periods following the calendar year in which a loan was restructured, a loan may no longer be reported as a TDR if it is on accrual, is in compliance with its modified terms, and yields a market rate (as determined and documented at the time of the modification or restructure). See Note 6 of the Notes to Consolidated Financial Statements for additional information regarding TDRs.

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TROUBLED DEBT RESTRUCTURED LOANS ROLLFORWARD

	Three Months Ended September 30,						Nine Months Ended September 30,
(In millions)	2018			2017			2018			2017
Balance at beginning of period	$	181		$	304		$	226		$	251
New identified TDRs and principal increases	46			7			115			163
Payments and payoffs	(19		)	(45		)	(107		)	(117		)
Charge-offs	(1		)	(4		)	(4		)	(17		)
No longer reported as TDRs	(2		)	—			(20		)	(4		)
Sales and other	(1		)	(14		)	(6		)	(28		)
Balance at end of period	$	204		$	248		$	204		$	248

Allowance for Credit Losses

In analyzing the adequacy of the ALLL, we utilize a comprehensive loan grading system to determine the risk potential in the portfolio and also consider the results of independent internal credit reviews. To determine the adequacy of the allowance, our loan and lease portfolio is broken into segments based on loan type.

The following schedule shows the changes in the allowance for loan losses and a summary of loan loss experience:

SUMMARY OF LOAN LOSS EXPERIENCE

(Dollar amounts in millions)	Nine Months Ended September 30, 2018			Twelve Months Ended December 31, 2017			Nine Months Ended September 30, 2017
Loans and leases outstanding (net of unearned income)	$	45,810		$	44,780		$	44,156
Average loans and leases outstanding (net of unearned income)	$	45,159		$	43,501		$	43,218
Allowance for loan losses:
Balance at beginning of period	$	518		$	567		$	567
Provision for loan losses	(46		)	24			35
Charge-offs:
Commercial	38			118			98
Commercial real estate	5			9			6
Consumer	13			17			13
Total	56			144			117
Recoveries:
Commercial	50			46			36
Commercial real estate	8			14			12
Consumer	6			11			8
Total	64			71			56
Net loan and lease charge-offs (recoveries)	(8		)	73			61
Balance at end of period	$	480		$	518		$	541
Ratio of annualized net charge-offs to average loans and leases	(0.02		)%	0.17		%	0.19		%
Ratio of allowance for loan losses to net loans and leases, at period end	1.05		%	1.16		%	1.23		%
Ratio of allowance for loan losses to nonaccrual loans, at period end	167		%	129		%	120		%
Ratio of allowance for loan losses to nonaccrual loans and accruing loans past due 90 days or more, at period end	160		%	122		%	112		%

The total ALLL decreased during the first nine months of 2018 by $38 million as a result of continued credit quality improvements in the total loan portfolio.

The RULC represents a reserve for potential losses associated with off-balance sheet commitments and standby letters of credit. The reserve is separately shown in the balance sheet and any related increases or decreases in the

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reserve are shown separately in the statement of income. At September 30, 2018, the reserve remained the same as at December 31, 2017, and decreased by $1 million from September 30, 2017.

See Note 6 of the Notes to Consolidated Financial Statements for additional information related to the ACL and credit trends experienced in each portfolio segment.

Interest Rate and Market Risk Management

Interest rate and market risk are managed centrally. Interest rate risk is the potential for reduced net interest income and other rate sensitive income resulting from adverse changes in the level of interest rates. Market risk is the potential for loss arising from adverse changes in the fair value of fixed income securities, equity securities, other earning assets, and derivative financial instruments as a result of changes in interest rates or other factors. As a financial institution that engages in transactions involving an array of financial products, we are exposed to both interest rate risk and market risk.

The Bank’s Board of Directors is responsible for approving the overall policies relating to the management of the financial risk of the Bank, including interest rate and market risk management. The Board has established the Asset/Liability Committee (“ALCO”) consisting of members of management, to which it has delegated the responsibility of managing interest rate and market risk for the Bank. ALCO establishes and periodically revises policy limits and reviews with the ROC the limits and limit exceptions reported by management.

Interest Rate Risk

Interest rate risk is one of the most significant risks to which we are regularly exposed. In general, our goal in managing interest rate risk is to manage balance sheet sensitivity to reduce net income volatility due to changes in interest rates.

Over the course of the last several years, we have actively reduced the level of asset-sensitivity through the purchase of short-to-medium duration agency pass-through securities and funding these purchases by reducing money market investments and increasing short-term borrowings. This repositioning of the investment portfolio has increased current net interest income while dampening the impact of higher rates on net interest income growth. We continue to anticipate moderately higher net interest income in a rising rate environment as our assets reprice more quickly than our liabilities.

Interest Rate Risk Measurement

We monitor interest rate risk through the use of two complementary measurement methods: net interest income simulation, or Earnings at Risk (“EaR”), and Economic Value of Equity at Risk (“EVE”). EaR analyzes the expected change in near term (one year) net interest income in response to changes in interest rates. In the EVE method, we measure the expected changes in the fair value of equity in response to changes in interest rates.

EaR is an estimate of the change in total net interest income that would be recognized under different rate environments over a one-year period. EaR is measured simulating net interest income under several different scenarios including parallel and nonparallel interest rate shifts across the yield curve, taking into account deposit repricing assumptions and estimates of the possible exercise of embedded options within the portfolio (e.g., a borrower’s ability to refinance a loan under a lower-rate environment). Our policy contains a trigger for a 10% decline in rate sensitive income as well as a risk capacity of a 13% decline if rates were to immediately rise or fall in parallel by 200 bps.

EVE is calculated as the fair value of all assets minus the fair value of liabilities. We measure changes in the dollar amount of EVE for parallel shifts in interest rates. Due to embedded optionality and asymmetric rate risk, changes in EVE can be useful in quantifying risks not apparent for small rate changes. Examples of such risks may include out-of-the-money interest rate caps (or limits) on loans, which have little effect under small rate movements but may become important if large rate changes were to occur, or substantial prepayment deceleration for low-rate mortgages in a higher-rate environment. Our policy contains a trigger for an 8% decline in EVE as well as a risk capacity of a 10% decline if rates were to immediately rise or fall in parallel by 200 bps. Exceptions to the EVE limits are subject to notification and approval by the ROC.

Estimating the impact on net interest income and EVE requires that we assess a number of variables and make various assumptions in managing our exposure to changes in interest rates. The assessments address deposit withdrawals and deposit product migration (e.g., customers moving money from checking accounts to certificates of deposit), competitive pricing (e.g., existing loans and deposits are assumed to roll into new loans and deposits at

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

similar spreads relative to benchmark interest rates), loan and security prepayments, and the effects of other similar embedded options. As a result of uncertainty about the maturity and repricing characteristics of both deposits and loans, we also calculate the sensitivity of EaR and EVE results to key assumptions. As most of our liabilities are comprised of indeterminate maturity and managed rate deposits, the modeled results are highly sensitive to the assumptions used for these deposits, such as checking, savings and money market accounts, and also to prepayment assumptions used for loans with prepayment options. We use historical regression analysis as a guide for setting such assumptions; however, due to the current low interest rate environment, which has little historical precedent, estimated deposit behavior may not reflect actual future results. Additionally, competition for funding in the marketplace has and may again result in changes to deposit pricing on interest-bearing accounts that are greater or less than changes in benchmark interest rates such as the London Interbank Offered Rate (“LIBOR”) or the federal funds rate.

Under most rising interest rate environments, we would expect some customers to move balances from demand deposits to interest-bearing accounts such as money market, savings, or certificates of deposit. The models are particularly sensitive to the assumption about the rate of such migration.

In addition, we assume certain correlation rates, often referred to as a “deposit beta,” of interest-bearing deposits, wherein the rates paid to customers change at a different pace when compared with changes in benchmark interest rates. Generally, certificates of deposit are assumed to have a high correlation rate, while interest-on-checking accounts are assumed to have a lower correlation rate. Actual results may differ materially due to factors including competitive pricing, money supply, credit worthiness of the Bank, and so forth; however, we use our historical experience as well as industry data to inform our assumptions.

The aforementioned migration and correlation assumptions result in deposit durations presented in the following schedule.

DEPOSIT ASSUMPTIONS

	September 30, 2018
Product	Effective duration (unchanged)		Effective duration (+200 bps)
Demand deposits	2.9	%	2.9	%
Money market	1.4	%	1.2	%
Savings and interest-on-checking	2.6	%	2.3	%

As of the dates indicated and incorporating the assumptions previously described, the following schedule shows EaR, or percentage change in net interest income, based on a static balance sheet size, in the first year after the interest rate change if interest rates were to sustain immediate parallel changes ranging from -100 bps to +300 bps.

INCOME SIMULATION – CHANGE IN NET INTEREST INCOME

	September 30, 2018
	Parallel shift in rates (in bps)1
Repricing scenario	-100		0		+100		+200		+300
Earnings at Risk	(2.8	)%	—	%	2.5	%	4.8	%	7.2	%

¹  Assumes rates cannot go below zero in the negative rate shift.

For non-maturity interest-bearing deposits, the weighted average modeled beta is 37%. If the weighted average deposit beta increased to 47% it would decrease the EaR in the +200bps shock from 4.8% to 2.5%.

The EaR analysis focuses on parallel rate shocks across the term structure of rates. The yield curve typically does not move in a parallel manner. During the past year, an increase in short-term rates has led to a flatter yield curve as longer-term rates have not increased at the same pace as short-term rates. If we consider a flattening rate shock

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

where the short-term rate moves +200bps but the ten-year rate only moves +30bps, the increase in earnings is 35% lower over 12 months compared with the parallel +200bps rate shock.

For comparative purposes, the December 31, 2017 measures are presented in the following schedule.

	December 31, 2017
	Parallel shift in rates (in bps)1
Repricing scenario	-100		0		+100		+200		+300
Earnings at Risk	(2.7	)%	—	%	2.8	%	5.4	%	7.8	%

¹  Assumes rates cannot go below zero in the negative rate shift.

The asset-sensitivity as measured by EaR decreased slightly quarter-over-quarter due to changes in the investment securities and funding compositions.

CHANGES IN ECONOMIC VALUE OF EQUITY

As of the dates indicated, the following schedule shows our estimated percentage change in EVE under parallel interest rate changes ranging from -100 bps to +300 bps. For non-maturity interest-bearing deposits, the weighted average modeled beta is 37%. If the weighted average deposit beta increased to 47% it would decrease the EVE in the +200bps shock from -4.3% to -6.3%.

	September 30, 2018
	Parallel shift in rates (in bps)1
Repricing scenario	-100		0		+100		+200		+300
Economic Value of Equity	1.1	%	—	%	(2.4	)%	(4.3	)%	(6.1	)%

¹  Assumes rates cannot go below zero in the negative rate shift.

For comparative purposes, the December 31, 2017 measures are presented in the following schedule. The changes in EVE measures from December 31, 2017 are driven by increases in interest rates which increase the expected life of certain assets and decrease the expected life of certain liabilities.

	December 31, 2017
	Parallel shift in rates (in bps)1
Repricing scenario	-100 bps		0 bps		+100 bps		+200 bps		+300 bps
Economic Value of Equity	0.2	%	—	%	0.5	%	0.3	%	0.2	%

¹  Assumes rates cannot go below zero in the negative rate shift.

Our focus on business banking also plays a significant role in determining the nature of the Bank’s asset-liability management posture. At September 30, 2018, $20 billion of the Bank’s commercial lending and CRE loan balances were scheduled to reprice in the next six months. Of these variable-rate loans approximately 97% are tied to either the prime rate or LIBOR. For these variable-rate loans we have executed $713 million of cash flow hedges by receiving fixed rates on interest rate swaps. Additionally, asset-sensitivity is reduced due to $68 million of variable-rate loans being priced at floored rates at September 30, 2018, which were above the “index plus spread” rate by an average of 60 bps. At September 30, 2018, we also had $3.3 billion of variable-rate consumer loans scheduled to reprice in the next six months. Of these variable-rate consumer loans approximately $13 million were priced at floored rates, which were above the “index plus spread” rate by an average of 87 bps.

See Notes 3 and 7 of the Notes to Consolidated Financial Statements for additional information regarding derivative instruments.

Market Risk – Fixed Income

We engage in the underwriting and trading of municipal securities. This trading activity exposes us to a risk of loss arising from adverse changes in the prices of these fixed income securities.

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At September 30, 2018, we had a relatively small amount, $176 million, of trading assets and $49 million of securities sold, not yet purchased, compared with $148 million and $95 million, respectively, at December 31, 2017.

We are exposed to market risk through changes in fair value. We are also exposed to market risk for interest rate swaps used to hedge interest rate risk. Changes in the fair value of AFS securities and in interest rate swaps that qualify as cash flow hedges are included in accumulated other comprehensive income (“AOCI”) for each financial reporting period. During the third quarter of 2018, the after-tax change in AOCI attributable to AFS securities decreased by $46 million, due largely to changes in the interest rate environment, compared with a $8 million decrease in the same prior year period.

Market Risk – Equity Investments

Through our equity investment activities, we own equity securities that are publicly-traded. In addition, we own equity securities in companies and governmental entities, e.g., the Federal Reserve Bank and an FHLB, that are not publicly-traded. The accounting for equity investments may use the cost, fair value, equity, or full consolidation methods of accounting, depending on our ownership position and degree of involvement in influencing the investees’ affairs. Regardless of the accounting method, the value of our investment is subject to fluctuation. Because the fair value of these securities may fall below our investment costs, we are exposed to the possibility of loss. Equity investments in private and public companies are approved, monitored and evaluated by the Bank’s Equity Investment Committee consisting of members of management.

We hold both direct and indirect investments in predominantly pre-public companies, primarily through various SBIC venture capital funds. Our equity exposure to these investments was approximately $134 million and $127 million at September 30, 2018 and December 31, 2017, respectively. On occasion, some of the companies within our SBIC investments may issue an initial public offering. In this case, the fund is generally subject to a lockout period before liquidating the investment, which can introduce additional market risk.

Additionally, Amegy has an alternative investments portfolio. These investments are primarily directed towards equity buyout and mezzanine funds with a key strategy of deriving ancillary commercial banking business from the portfolio companies. Early stage venture capital funds are generally not a part of the strategy because the underlying companies are typically not creditworthy. The carrying value of Amegy’s equity investments was $11 million and $12 million at September 30, 2018 and December 31, 2017, respectively.

These private equity investments (“PEIs”) are subject to the provisions of the Dodd-Frank Act. The Volcker Rule of the Dodd-Frank Act prohibits banks and bank holding companies from holding PEIs, except for SBIC funds and certain other permitted exclusions, beyond a required deadline. The Federal Reserve Board (“FRB”) announced in December 2016 that it would allow banks to apply for an additional five-year extension beyond the July 21, 2017 deadline to comply with the Dodd-Frank Act requirement for these investments. The Bank applied for and was granted an extension for its eligible PEIs. All positions in the remaining portfolio of PEIs are subject to the extended deadline or other applicable exclusions.

As of September 30, 2018, such prohibited PEIs amounted to $3 million, with an additional $2 million of unfunded commitments (see Note 5 of the Notes to Consolidated Financial Statements for more information). We currently do not believe that this divestiture requirement will ultimately have a material impact on our financial statements.

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Liquidity Risk Management

Overview

Liquidity refers to our capacity to meet our cash and collateral obligations and to manage both expected and unexpected cash flows without adversely impacting the operations or financial strength of the Bank. Sources of liquidity include both unencumbered assets, such as marketable loans and securities, and traditional forms of funding, such as deposits, borrowings and equity. At September 30, 2018, our investment securities portfolio of $15.6 billion and cash and money market investments of $1.7 billion collectively comprised 26% of total assets. At September 30, 2018, assets that are considered high-quality liquid assets, including eligible cash, decreased to $12.0 billion, compared with $12.3 billion at December 31, 2017.

Liquidity Regulation

Upon passage of the Economic Growth, Regulatory Relief, and Consumer Protection Act, the Bank is no longer subject to the Enhanced Prudential Standards for liquidity management (Reg. YY). However, the Bank continues to perform liquidity stress tests and assess its portfolio of highly liquid assets (sufficient to cover 30-day funding needs under the stress scenarios).

Liquidity Management Actions

The Bank’s consolidated cash, interest-bearing deposits held as investments, and security resell agreements was $1.5 billion at September 30, 2018 compared to $1.6 billion at December 31, 2017 and $1.7 billion at September 30, 2017. During the first nine months of 2018, uses of cash were primarily from (1) repayment of short-term debt, (2) loan originations, (3) repurchases of our common stock, and (4) dividends on common and preferred stock. The primary sources of cash during the same period were from (1) a net increase in deposits, (2) net cash provided by operating activities, (3) the issuance of long-term debt and (4) a net decrease in investment securities.

The Bank’s loan to total deposit ratio has remained consistent at 85% for the periods ending September 30, 2018, December 31, 2017, and September 30, 2017. The Bank’s core deposits, consisting of noninterest-bearing demand deposits, savings and money market deposits, and time deposits under $250,000, was $50.9 billion at September 30, 2018 compared with $50.7 billion at December 31, 2017.

Total deposits were $53.8 billion at September 30, 2018, compared with $52.6 billion at December 31, 2017 and $52.1 billion at September 30, 2017. The increase for the first nine months of 2018 was a result of a $1.1 billion and $181 million increase in time deposits and noninterest-bearing demand deposits, respectively, partially offset by a $158 million decrease in savings and money market deposits.

During the third quarter of 2018, the Bank issued a $500 million senior note with an interest rate of 3.5% and a maturity date of August 27, 2021. At September 30, 2018, maturities of our long-term senior and subordinated debt ranged from August 2021 to September 2028. In October 2018, the Board of Directors approved the call, on the November 15, 2018 call date, of $162 million of subordinated notes maturing November 15, 2023.

The Bank’s cash payments for interest, reflected in operating expenses, increased to $157 million during the first nine months of 2018 from $79 million during the first nine months of 2017 primarily due to an increase in interest rates and deposits, which was partially offset by a decrease in short-term borrowings. Additionally, the Bank paid approximately $172 million of total dividends on preferred stock and common stock for the first nine months of 2018 compared with $89 million for the first nine months of 2017. Dividends paid per common share have increased gradually from $0.12 in the third quarter of 2017 to $0.30 in the third quarter of 2018. In October 2018, the Board approved a quarterly common dividend of $0.30 per share.

General financial market and economic conditions impact our access to, and cost of, external financing. Access to funding markets for the Bank is also directly affected by the credit ratings received from various rating agencies. The ratings not only influence the costs associated with the borrowings, but can also influence the sources of the

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

borrowings. All of the credit rating agencies rate the Bank’s debt at an investment-grade level. The Bank’s credit ratings have continued to improve during 2018 and are presented in the following schedule.

CREDIT RATINGS
as of October 31, 2018:
Rating agency	Outlook	Long-term issuer/senior debt rating	Subordinated debt rating	Short-term debt rating
S&P	Stable	BBB+	BBB-	A-2
Moody’s	Positive	Baa3		P-2
Kroll	Stable	A-	BBB	K2

The FHLB system and Federal Reserve Banks have been and are a source of back-up liquidity, and from time to time, have been a significant source of funding. Zions Bancorporation, N.A. is a member of the FHLB of Des Moines. The FHLB allows member banks to borrow against their eligible loans and securities to satisfy liquidity and funding requirements. The Bank is required to invest in FHLB and Federal Reserve stock to maintain their borrowing capacity.

At September 30, 2018, the amount available for additional FHLB and Federal Reserve borrowings was approximately $14.9 billion, compared with $14.7 billion at December 31, 2017. Loans with a carrying value of approximately $23.4 billion at September 30, 2018 have been pledged at the FHLB of Des Moines and the Federal Reserve as collateral for current and potential borrowings compared with $25.6 billion at December 31, 2017. At September 30, 2018, we had $2.9 billion of short-term FHLB borrowings outstanding and no long-term FHLB or Federal Reserve borrowings outstanding, compared with $3.6 billion of short-term FHLB borrowings and no long-term FHLB or Federal Reserve borrowings outstanding at December 31, 2017. At September 30, 2018, our total investment in FHLB and Federal Reserve stock was $126 million and $185 million, respectively, compared with $154 million and $184 million at December 31, 2017.

Our investment activities can provide or use cash, depending on the asset-liability management posture taken. During the first nine months of 2018, HTM and AFS investment securities’ activities resulted in a net decrease in investment securities and a net $155 million increase in cash, compared with a net $2.1 billion decrease in cash for the first nine months of 2017.

Maturing balances in the Bank’s loan portfolios also provide additional flexibility in managing cash flows. Lending activity for the first nine months of 2018 resulted in a net cash outflow of $981 million compared with a net cash outflow of $1.5 billion for the first nine months of 2017.

We may also, from time to time, issue additional preferred stock, senior or subordinated notes or other forms of capital or debt instruments, depending on our capital, funding, asset-liability management or other needs as market conditions warrant and subject to any required regulatory approvals. Management believes that the sources of available liquidity are adequate to meet all reasonably foreseeable short-term and intermediate-term demands. A more comprehensive discussion of liquidity risk management, including liquidity risk oversight, liquidity regulation, and certain contractual obligations, is contained in our 2017 Annual Report on Form 10-K.

Operational Risk Management

Operational risk is the risk to current or anticipated earnings or capital arising from inadequate or failed internal processes or systems, human errors or misconduct, or adverse external events. In our ongoing efforts to identify and manage operational risk, we have an ERM department whose responsibility is to help employees, management and the Board of Directors to assess, understand, measure, manage, and monitor risk in accordance with our Risk Appetite Framework. We have documented both controls and the Control Self-Assessment related to financial reporting under the 2013 framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and the Federal Deposit Insurance Corporation Improvement Act.

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Periodic reviews, which include aspects of operational risk, are conducted by the Bank’s Compliance Risk Management, Internal Audit and Credit Examination departments on a regular basis, and the Data Governance department also provide key data integrity and availability oversight. We are continually improving our oversight of operational risk, including enhancement of risk identification, risk and control self-assessments, and antifraud measures, which are reported on a regular basis to enterprise management committees. As part of this process, and as a result of the number and sophistication of attempts to disrupt or penetrate our critical systems, we have designated cyber risk a level one risk in our risk taxonomy, which places it at the highest level of oversight with our other top risks. For a more comprehensive discussion of operational risk management see our 2017 Annual Report on Form 10-K.

CAPITAL MANAGEMENT

We believe that a strong capital position is vital to continued profitability and to promoting depositor and investor confidence.

Merger of Bank Holding Company into Bank

On September 30, 2018, the Bank completed the merger of Zions Bancorporation, its former bank holding company, with, and into the Bank, formerly known as ZB, N.A. in order to reduce organizational complexity. The restructuring eliminated the bank holding company structure and associated regulatory framework, and resulted in ZB, N.A. being renamed Zions Bancorporation, National Association and becoming the top-level entity within our corporate structure. The Bank’s primary regulator is now the OCC. The Bank continues to be subject to examinations by the CFPB with respect to consumer financial regulations.

Stress Testing

As a result of the Financial Stability Oversight Council’s action on September 12, 2018 and the merger of the holding company on September 30, 2018, the Bank is no longer considered a systemically important financial institution under the Dodd-Frank Act. The Bank expects to have greater flexibility in the active management of shareholders’ equity. The Bank expects to continue to utilize stress testing as the primary mechanism to inform its decisions on the appropriate level of capital, based upon actual and hypothetically-stressed economic conditions. Therefore, the timing and amount of capital actions will be subject to various factors, including the Bank's financial performance and prevailing and anticipated economic conditions.

Capital Management Actions

During the third quarter of 2018, the Bank repurchased 3.5 million shares of common stock for $185 million, and has repurchased a total of 10.1 million shares of common stock for $535 million over the last 12 months at an average price of $52.86 per share. In October 2018, the Bank announced that the Board approved a plan to repurchase $250 million of common stock during the fourth quarter of 2018 and begun the repurchases. However, the timing and amount of additional common share repurchases will be subject to various factors, including the Bank's financial performance, business needs, and prevailing economic conditions. Shares may be repurchased occasionally in the open market, through privately negotiated transactions, utilizing Rule 10b5-1 plans or otherwise.

As planned, our quarterly dividend on common stock increased to $0.30 per share during the third quarter of 2018. We paid $145 million in dividends on common stock during the first nine months of 2018 compared with $57 million during the first nine months of 2017. In October 2018, the Board of Directors declared a quarterly dividend of $0.30 per common share payable on November 21, 2018 to shareholders of record on November 14, 2018. We paid dividends on preferred stock of $27 million for the first nine months of 2018 compared with $32 million during the first nine months of 2017. See Note 8 for additional detail about capital management transactions during the first nine months of 2018.

Total shareholders’ equity has decreased slightly and was $7.6 billion at September 30, 2018 compared with $7.7 billion at December 31, 2017 and $7.8 billion at September 30, 2017. Total shareholders’ equity decreased from December 31, 2017 by (1) $420 million from repurchases of Bank common stock, (2) $222 million from a decrease

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

in the fair value of our AFS securities due largely to changes in the interest rate environment, and (3) $172 million from common and preferred dividends paid. These decreases were partially offset by net income of $658 million.

Weighted average diluted shares decreased by 3.3 million compared with the third quarter of 2017, primarily due to share repurchases, partially offset by the dilutive impact of an increased common share price on warrants that have been outstanding since 2008 (Troubled Asset Relief Program or “TARP” warrants - NASDAQ: ZIONZ) and 2010 (NASDAQ: ZIONW) and employee equity grants. During 2017 and the first nine months of 2018, the market price of our common stock was higher than the exercise price of common stock warrants on our common stock and had a dilutive effect upon earnings per share. During the first nine months of 2018, 1.3 million shares of common stock were issued from the cashless exercise of 3.9 million common stock warrants which would have expired on November 14, 2018. As of September 30, 2018, the Bank had 1.9 million and 29.3 million warrants outstanding of ZIONZ (TARP) and ZIONW warrants, respectively. The ZIONZ warrants expire on November 14, 2018 and the ZIONW warrants expire on May 22, 2020.

The following schedule presents the diluted shares from the remaining common stock warrants at various Zions Bancorporation, N.A. common stock market prices as of October 31, 2018, excluding the effect of changes in exercise cost and warrant share multiplier from the future payment of common stock dividends.

IMPACT OF COMMON STOCK WARRANTS

Assumed Zions Bancorporation, N.A. Common Stock Market Price		Diluted Shares (000s)
$	35.00	0
40.00		5,154
45.00		8,196
50.00		10,630
55.00		12,621
60.00		14,281
65.00		15,685

See Note 8 of the Notes to Consolidated Financial Statements for more information on our common stock warrants.

Basel III

In 2013, the FRB, FDIC, and OCC published final rules (the “Basel III Capital Rules”) establishing a new comprehensive capital framework for U.S. banking organizations. The rules implemented the Basel Committee’s December 2010 framework, commonly referred to as Basel III, for strengthening international capital standards as well as certain provisions of the Dodd-Frank Act. The Basel III capital rules became effective for the Bank on January 1, 2015 and were subject to phase-in periods for certain of their components. In November 2017, the FRB, FDIC and OCC published a final rule for non-advanced approaches banks that extends the regulatory capital treatment applicable during 2017 under the regulatory capital rules for certain items.

A detailed discussion of Basel III requirements, including implications for the Bank, is contained on page 9 in “Capital Standards – Basel Framework” under Part 1, Item 1 in our 2017 Annual Report on Form 10-K.

We met all capital adequacy requirements under the Basel III Capital Rules based upon phase-in rules as of September 30, 2018, and believe that we would meet all capital adequacy requirements on a fully phased-in basis if such requirements were currently effective.

Capital Ratios

Banking organizations are required by capital regulations to maintain adequate levels of capital as measured by several regulatory capital ratios. Zions will continue to utilize stress testing as its primary mechanism to inform its decisions on the appropriate level of capital, based upon actual and hypothetically-stressed economic conditions.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

The following schedule shows the Bank’s capital and performance ratios as of September 30, 2018, December 31, 2017 and September 30, 2017.

CAPITAL RATIOS

	September 30, 2018		December 31, 2017		September 30, 2017
Tangible common equity ratio1	9.1	%	9.3	%	9.6	%
Tangible equity ratio1	9.9	%	10.2	%	10.4	%
Average equity to average assets (three months ended)	11.4	%	11.9	%	11.9	%
Basel III risk-based capital ratios2:
Common equity tier 1 capital	12.1	%	12.1	%	12.2	%
Tier 1 leverage	10.5	%	10.5	%	10.6	%
Tier 1 risk-based	13.1	%	13.2	%	13.3	%
Total risk-based	14.6	%	14.8	%	15.0	%
Return on average common equity (three months ended)	12.1	%	6.3	%	8.3	%
Return on average tangible common equity (three months ended)1	14.2	%	7.4	%	9.8	%

¹  See “GAAP to Non-GAAP Reconciliations” on page 5 for more information regarding these ratios.

²  Based on the applicable phase-in periods.

At September 30, 2018, Basel III regulatory tier 1 risk-based capital and total risk-based capital was $6.9 billion and $7.7 billion, respectively, compared with $6.8 billion and $7.6 billion, respectively, at December 31, 2017. A more comprehensive discussion of our capital management is contained in our 2017 Annual Report on Form 10-K.

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ITEM 1. FINANCIAL STATEMENTS (Unaudited)

ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS
(In millions, shares in thousands)	September 30, 2018			December 31, 2017
	(Unaudited)
ASSETS
Cash and due from banks	$	517		$	548
Money market investments:
Interest-bearing deposits	590			782
Federal funds sold and security resell agreements	560			514
Investment securities:
Held-to-maturity, at amortized cost (approximate fair value $734 and $762)	751			770
Available-for-sale, at fair value	14,625			15,161
Trading account, at fair value	176			148
Total investment securities	15,552			16,079
Loans held for sale	61			44
Loans and leases, net of unearned income and fees	45,810			44,780
Less allowance for loan losses	480			518
Loans held for investment, net of allowance	45,330			44,262
Other noninterest-bearing investments	1,027			1,029
Premises, equipment and software, net	1,111			1,094
Goodwill and intangibles	1,015			1,016
Other real estate owned	4			4
Other assets	964			916
Total Assets	$	66,731		$	66,288
LIABILITIES AND SHAREHOLDERS’ EQUITY
Deposits:
Noninterest-bearing demand	$	24,067		$	23,886
Interest-bearing:
Savings and money market	25,462			25,620
Time	4,256			3,115
Total deposits	53,785			52,621
Federal funds purchased and other short-term borrowings	3,780			4,976
Long-term debt	879			383
Reserve for unfunded lending commitments	58			58
Other liabilities	676			571
Total liabilities	59,178			58,609
Shareholders’ equity:
Preferred stock, without par value; authorized 4,400 shares	566			566
Common stock ($0.001 par value; authorized 350,000 shares; issued and outstanding 192,169 and 197,532 shares)	—			4,445
Additional paid-in capital	4,052			—
Retained earnings	3,296			2,807
Accumulated other comprehensive income (loss)	(361		)	(139		)
Total shareholders’ equity	7,553			7,679
Total liabilities and shareholders’ equity	$	66,731		$	66,288

See accompanying notes to consolidated financial statements.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME (Unaudited)
(In millions, except shares and per share amounts)	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Interest income:
Interest and fees on loans	$	537		$	468		$	1,548		$	1,370
Interest on money market investments	8			5			20			14
Interest on securities	86			84			257			246
Total interest income	631			557			1,825			1,630
Interest expense:
Interest on deposits	38			15			87			43
Interest on short- and long-term borrowings	28			20			84			48
Total interest expense	66			35			171			91
Net interest income	565			522			1,654			1,539
Provision for loan losses	(11		)	5			(46		)	35
Net interest income after provision for loan losses	576			517			1,700			1,504
Noninterest income:
Service charges and fees on deposit accounts	42			42			125			127
Other service charges, commissions and fees	59			55			168			160
Wealth management and trust income	12			11			38			30
Loan sales and servicing income	5			6			18			19
Capital markets and foreign exchange	7			8			23			21
Customer-related fees	125			122			372			357
Dividends and other investment income	11			9			34			31
Securities gains (losses), net	(1		)	5			(1		)	13
Other	1			3			7			3
Total noninterest income	136			139			412			404
Noninterest expense:
Salaries and employee benefits	264			251			800			753
Occupancy, net	33			35			96			101
Furniture, equipment and software, net	30			32			95			96
Other real estate expense, net	1			(1		)	1			(1		)
Credit-related expense	5			7			19			23
Provision for unfunded lending commitments	—			(4		)	—			(6		)
Professional and legal services	12			15			37			43
Advertising	8			6			20			17
FDIC premiums	18			15			44			40
Other	49			57			147			166
Total noninterest expense	420			413			1,259			1,232
Income before income taxes	292			243			853			676
Income taxes	69			83			195			207
Net income	223			160			658			469
Preferred stock dividends	(8		)	(8		)	(25		)	(30		)
Preferred stock redemption	—			—			—			(3		)
Net earnings applicable to common shareholders	$	215		$	152		$	633		$	436
Weighted average common shares outstanding during the period:
Basic shares (in thousands)	192,973			200,332			195,079			201,493
Diluted shares (in thousands)	205,765			209,106			208,657			209,366
Net earnings per common share:
Basic	$	1.11		$	0.75		$	3.22		$	2.14
Diluted	1.04			0.72			3.01			2.06

See accompanying notes to consolidated financial statements.

36

ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)
	Three Months Ended September 30,						Nine Months Ended September 30,
(In millions)	2018			2017			2018			2017
Net income for the period	$	223		$	160		$	658		$	469
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) on investment securities	(45		)	(8		)	(221		)	65
Net unrealized gains on other noninterest-bearing investments	—			—			3			2
Net unrealized holding gains (losses) on derivative instruments	(1		)	—			(6		)	—
Reclassification adjustment for increase in interest income recognized in earnings on derivative instruments	1			—			2			(2		)
Other comprehensive income (loss)	(45		)	(8		)	(222		)	65
Comprehensive income	$	178		$	152		$	436		$	534

See accompanying notes to consolidated financial statements.

37

ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (Unaudited)
(In millions, except shares and per share amounts)	Preferred stock			Common stock					Accumulated paid-in capital		Retained earnings			Accumulated other comprehensive income (loss)				Total shareholders’ equity
				Shares (in thousands)		Amount
Balance at December 31, 2017	$	566		197,532		$	4,445		$	—	$	2,807			$	(139	)	$	7,679
Net income for the period											658							658
Other comprehensive income (loss), net of tax															(222		)	(222		)
Cumulative effect adjustment, adoption of ASU 2014-09, Revenue from Contracts with Customers											1							1
Bank common stock repurchased				(8,050	)	(434		)										(434		)
Net shares issued from stock warrant exercises				1,278
Net activity under employee plans and related tax benefits				1,409		41												41
Dividends on preferred stock											(25		)					(25		)
Dividends on common stock, $0.74 per share											(145		)					(145		)
Merger of bank holding company into bank						(4,052		)	4,052
Balance at September 30, 2018	$	566		192,169		$	—		$	4,052	$	3,296			$	(361	)	$	7,553
Balance at December 31, 2016	$	710		203,085		$	4,725		$	—	$	2,321			$	(122	)	$	7,634
Net income for the period											469							469
Other comprehensive income (loss), net of tax															65			65
Preferred stock redemption	(144		)			2					(2		)					(144		)
Bank common stock repurchased				(4,975	)	(217		)										(217		)
Net activity under employee plans and related tax benefits				1,602		42												42
Dividends on preferred stock											(30		)					(30		)
Dividends on common stock, $0.28 per share											(58		)					(58		)
Balance at September 30, 2017	$	566		199,712		$	4,552		$	—	$	2,700			$	(57	)	$	7,761

See accompanying notes to consolidated financial statements.

38

ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)
(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$	223		$	160		$	658		$	469
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(11		)	1			(46		)	29
Depreciation and amortization	49			47			141			131
Share-based compensation	4			4			22			21
Deferred income tax expense (benefit)	(6		)	(4		)	(4		)	4
Net decrease (increase) in trading securities	31			5			(28		)	59
Net decrease (increase) in loans held for sale	2			(18		)	(32		)	71
Change in other liabilities	20			84			105			63
Change in other assets	79			(42		)	27			(9		)
Other, net	(4		)	(10		)	(18		)	(35		)
Net cash provided by operating activities	387			227			825			803
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease in money market investments	106			363			146			748
Proceeds from maturities and paydowns of investment securities held-to-maturity	170			83			284			249
Purchases of investment securities held-to-maturity	(43		)	(54		)	(265		)	(127		)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	992			615			2,396			1,775
Purchases of investment securities available-for-sale	(1,084		)	(535		)	(2,260		)	(4,001		)
Net change in loans and leases	(550		)	(475		)	(981		)	(1,511		)
Net change in other noninterest-bearing investments	33			14			29			(89		)
Purchases of premises and equipment	(36		)	(39		)	(90		)	(133		)
Other, net	2			4			2			12
Net cash used in investing activities	(410		)	(24		)	(739		)	(3,077		)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	204			(278		)	1,169			(1,136		)
Net change in short-term funds borrowed	(377		)	(718		)	804			1,297
Proceeds from debt over 90 days and up to one year	—			1,850			—			3,600
Repayments of debt over 90 days and up to one year	—			(850		)	(2,000		)	(1,100		)
Cash paid for preferred stock redemption	—			—			—			(144		)
Proceeds from the issuance of long-term debt	497			—			497			—
Repayment of long-term debt	—			—			—			(153		)
Proceeds from the issuance of common stock	2			2			19			20
Dividends paid on common and preferred stock	(68		)	(34		)	(172		)	(89		)
Bank common stock repurchased	(186		)	(115		)	(434		)	(217		)
Net cash provided by (used in) financing activities	72			(143		)	(117		)	2,078
Net increase (decrease) in cash and due from banks	49			60			(31		)	(196		)
Cash and due from banks at beginning of period	468			481			548			737
Cash and due from banks at end of period	$	517		$	541		$	517		$	541
Cash paid for interest	$	57		$	27		$	157		$	79
Net cash paid for income taxes	51			84			142			206
Noncash activities are summarized as follows:
Loans held for investment transferred to other real estate owned	—			1			6			5
Loans held for investment reclassified to loans held for sale, net	(1		)	3			38			14

See accompanying notes to consolidated financial statements.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

September 30, 2018

1. BASIS OF PRESENTATION

The accompanying unaudited consolidated financial statements of Zions Bancorporation, National Association and its majority-owned subsidiaries (collectively “Zions Bancorporation, N.A.,” “the Bank,” “we,” “our,” “us”) have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board, are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force.

Operating results for the nine months endedSeptember 30, 2018 and 2017 are not necessarily indicative of the results that may be expected in future periods. In preparing the consolidated financial statements, we are required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The consolidated balance sheet at December 31, 2017 is from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Bank’s 2017 Annual Report on Form 10-K. Certain prior period amounts have been reclassified to conform with the current period presentation. These reclassifications did not affect net income or shareholders’ equity.

Zions Bancorporation, N.A. is a commercial bank headquartered in Salt Lake City, Utah. The Bank provides a full range of banking and related services in 11 Western and Southwestern states through 7 separately managed and branded units as follows: Zions Bank, in Utah, Idaho and Wyoming; Amegy Bank (“Amegy”), in Texas; California Bank & Trust (“CB&T”); National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“Vectra”), in Colorado and New Mexico; and The Commerce Bank of Washington (“TCBW”) which operates under that name in Washington and under the name The Commerce Bank of Oregon in Oregon.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

2. RECENT ACCOUNTING PRONOUNCEMENTS

Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards not yet adopted by the Bank
ASU 2016-02, Leases (Topic 842) and subsequent related ASUs	The standard requires that a lessee recognize assets and liabilities for leases on the balance sheet. For leases with a term of 12 months or less, however, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee will depend primarily on its classification as a finance or operating lease. The standard also requires disclosures to better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements.	January 1, 2019	Upon adoption of the standard, we currently estimate the right-of-use asset to be between $200-$250 million. This estimate may change depending on the Bank’s lease activity. The implementation team is working on gathering all key lease data elements to meet the requirements of the new guidance. Additionally, we are implementing new lease software that will accommodate the new accounting requirements.
ASU 2017-08, Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities	The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium. The standard requires the premium to be amortized to the earliest call date. The update does not change the accounting for securities held at a discount.	January 1, 2019	Our analysis suggests this guidance will not have a material impact on the Bank’s financial statements, but we will continue to monitor its impact as we move closer to implementation.
ASU 2016-13, Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	The standard significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The standard replaces today’s “incurred loss” approach with an “expected loss” model for instruments such as loans and held-to-maturity (“HTM”) securities that are measured at amortized cost. The standard requires credit losses relating to available-for-sale (“AFS”) debt securities to be recorded through an allowance for credit loss (“ACL”) rather than a reduction of the carrying amount. It also changes the accounting for purchased credit-impaired debt securities and loans. The standard retains many of the current disclosure requirements in U.S. GAAP and expands certain disclosure requirements. Early adoption of the guidance is permitted as of January 1, 2019.	January 1, 2020	We have formed an implementation team led jointly by Credit, Treasury, and the Corporate Controller’s group, that also includes other lines of business and functions within the Bank. The implementation team is developing models that can meet the requirements of the new guidance. While this standard may potentially have a material impact on the Bank’s financial statements, we are still in process of conducting our evaluation.
ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	The standard eliminates the requirement to calculate the implied fair value of goodwill (i.e. Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, entities would record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current guidance). The standard does not change the guidance on completing Step 1 of the goodwill impairment test. The standard also continues to allow entities to perform the optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The standard is effective for the Bank as of January 1, 2020. Early adoption is allowed for any goodwill impairment test performed after January 1, 2017.	January 1, 2020	We do not currently expect this guidance will have a material impact on the Bank’s financial statements since the fair values of our reporting units were not lower than their respective carrying amounts at the time of our goodwill impairment analysis for 2017.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards not yet adopted by the Bank (continued)
ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement	The purpose of this standard is to improve the effectiveness of disclosures in the notes to the financial statements. The update outlines removals, modifications, and additions to the disclosure requirements on fair value measurement.	January 1, 2020	This standard will not have a material impact to the financial statements as its only impact is to the disclosure requirements for fair value measurement. We will update the impacted disclosures at the effective date.
ASU 2018-15, Intangibles – Goodwill and Other-Internal-Use Software (Topic 350-40): Customer’s Accounting for Implementation Cost Incurred in a Cloud Computing Arrangement That Is a Service Contract	The standard provides revised accounting guidance related to the accounting for implementation costs associated with cloud computing arrangements that meet the criteria for a service contract. Some of the main provisions include: -Implementation costs will be recognized as an asset or expense when incurred on the basis of existing GAAP, specifically guidance already provided around internal-use software. The amortization period will be the noncancelable hosting contract term plus any expected renewal periods. Entity in a hosting arrangement that is a service contract must provide certain qualitative and quantitative disclosures. Disclosures would also include implementation costs incurred for internal-use software. For transition there is an option to either apply guidance retrospectively or prospectively.	January 1, 2020	We are currently evaluating the potential impact of this new guidance on the Bank’s financial statements.
Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards adopted by the Bank
ASU 2014-09, Revenue from Contracts with Customers (Topic 606) and subsequent related ASUs	The core principle of the new guidance is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The banking industry does not expect significant changes because major sources of revenue are from financial instruments that have been excluded from the scope of the new standard, (including loans, derivatives, debt and equity securities, etc.). However, these new standards affect other fees charged by banks, such as asset management fees, credit card interchange fees, deposit account fees, etc. Adoption may be made on a full retrospective basis with practical expedients, or on a modified retrospective basis with a cumulative effect adjustment. Additionally, the new guidance significantly increases the disclosures related to revenue recognition practices.	January 1, 2018	We adopted this guidance using the modified retrospective transition method. There was no material impact at adoption to the Bank’s consolidated financial statements. New disclosures are found in Footnote 10.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards adopted by the Bank (continued)
ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	The standard provides revised accounting guidance related to the accounting for and reporting of financial instruments. Some of the main provisions include: – Equity investments that do not result in consolidation and are not accounted for under the equity method would be measured at fair value through net income. – Changes in instrument-specific credit risk for financial liabilities that are measured under the fair value option would be recognized in other comprehensive income (“OCI”). – Elimination of the requirement to disclose the methods and significant assumptions used to estimate the fair value of financial instruments carried at amortized cost. However, it will require the use of exit price when measuring the fair value of financial instruments measured at amortized cost for disclosure purposes.	January 1, 2018	The transition adjustment upon adoption of this guidance was not material. We refined our valuation models to better account for an exit price, which does not impact our financial statements, but does have an impact on our disclosures, as provided in Footnote 3.
ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities	The purpose of this standard is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. The standard is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. The standard requires a modified retrospective transition method that requires recognition of the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption.	January 1, 2018	We early adopted this guidance in the first quarter. The adoption of this guidance did not have a material impact on our consolidated financial statements at transition.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

3. FAIR VALUE

Fair Value Measurement

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. For a discussion of the Bank’s valuation methodologies for assets and liabilities measured at fair value and the fair value hierarchy, see Note 3 of our 2017 Annual Report on Form 10-K.

Quantitative Disclosure by Fair Value Hierarchy

Assets and liabilities measured at fair value by class on a recurring basis are summarized as follows:

(In millions)	September 30, 2018
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	25	$	13,292	$	—	$	13,317
Municipal securities			1,284				1,284
Other debt securities			24				24
Total Available-for-sale	25		14,600		—		14,625
Trading account	119		57				176
Other noninterest-bearing investments:
Bank-owned life insurance			516				516
Private equity investments					103		103
Other assets:
Agriculture loan servicing and interest-only strips					18		18
Deferred compensation plan assets	108						108
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			18				18
Foreign currency exchange contracts	4						4
Total Assets	$	256	$	15,192	$	121	$	15,569
LIABILITIES
Securities sold, not yet purchased	$	49	$	—	$	—	$	49
Other liabilities:
Deferred compensation plan obligations	108						108
Derivatives:
Interest rate swaps for customers			73				73
Foreign currency exchange contracts	3						3
Total Liabilities	$	160	$	73	$	—	$	233

¹We used a third-party pricing service to measure fair value for approximately 95% of our AFS Level 2 securities.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

(In millions)	December 31, 2017
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	25	$	13,706	$	—	$	13,731
Municipal securities			1,334				1,334
Other debt securities			24				24
Money market mutual funds and other	71		1				72
Total Available-for-sale	96		15,065		—		15,161
Trading account			148				148
Other noninterest-bearing investments:
Bank-owned life insurance			507				507
Private equity investments					95		95
Other assets:
Agriculture loan servicing and interest-only strips					18		18
Deferred compensation plan assets	102						102
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			28				28
Foreign currency exchange contracts	9						9
Total Assets	$	207	$	15,749	$	113	$	16,069
LIABILITIES
Securities sold, not yet purchased	$	95	$	—	$	—	$	95
Other liabilities:
Deferred compensation plan obligations	102						102
Derivatives:
Interest rate swaps for customers			33				33
Foreign currency exchange contracts	7						7
Total Liabilities	$	204	$	33	$	—	$	237

¹We used a third-party pricing service to measure fair value for approximately 92% of our AFS Level 2 securities.

Level 3 Valuations

Private Equity Investments

Private equity investments (“PEIs”) are generally measured under Level 3. Certain investments that have converted to being publicly-traded are measured under Level 1. The majority of these PEIs are held in the Bank’s Small Business Investment Company (“SBIC”) and are early-stage venture investments. The fair value measurements of these investments are updated at least on a quarterly basis, including whenever a new round of financing occurs. Certain of these investments are measured using multiples of operating performance. The fair value measurements of PEIs are reviewed on a quarterly basis by the Securities Valuation Committee. The Equity Investments Committee, consisting of executives familiar with the investments, reviews periodic financial information, including audited financial statements when available.

Certain valuation analytics may be employed that include current and projected financial performance, recent financing activities, economic and market conditions, market comparables, market liquidity, sales restrictions, and other factors. A significant change in the expected performance of the individual investment would result in a change in the fair value measurement of the investment. The amount of unfunded commitments to invest is disclosed in Note 5. Certain restrictions apply for the redemption of these investments and certain investments are prohibited by the Volcker Rule. See discussions in Note 5.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

Agriculture Loan Servicing

This asset results from our servicing of agriculture loans approved and funded by Federal Agricultural Mortgage Corporation (“FAMC”). We provide this servicing under an agreement with FAMC for loans they own. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies.

Interest-Only Strips

Interest-only strips are created as a by-product of the securitization process. When the guaranteed portions of Small Business Administration (“SBA”) 7(a) loans are pooled, interest-only strips may be created in the pooling process. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies.

Reconciliation of Level 3 Fair Value Measurements

The following reconciles the beginning and ending balances of assets and liabilities that are measured at fair value by class on a recurring basis using Level 3 inputs:

	Level 3 Instruments
	Three Months Ended									Nine Months Ended
	September 30, 2018					September 30, 2017				September 30, 2018				September 30, 2017
(In millions)	Private equity investments			Ag loan svcg and int-only strips		Private equity investments		Ag loan svcg and int-only strips		Private equity investments		Ag loan svcg and int-only strips		Private equity investments			Ag loan svcg and int-only strips
Balance at beginning of period	$	102		$	18	$	82	$	19	$	95	$	18	$	73		$	20
Securities gains (losses), net	(1		)	—		5		—		—		—		7			—
Other noninterest income	—			—		—		—		—		—		—			(1		)
Purchases	2			—		6		—		8		—		18			—
Redemptions and paydowns	—			—		—		—		—		—		(5		)	—
Balance at end of period	$	103		$	18	$	93	$	19	$	103	$	18	$	93		$	19

No transfers of assets or liabilities occurred among Levels 1, 2 or 3 for the three and nine months ended September 30, 2018 and 2017.

The reconciliation of Level 3 instruments includes the following realized gains and losses in the statement of income:

(In millions)	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018			2017
Securities gains (losses), net	$	—	$	—	$	(3	)	$	3

Nonrecurring Fair Value Measurements

Included in the balance sheet amounts are the following amounts of assets that had fair value changes measured on a nonrecurring basis.

(In millions)	Fair value at September 30, 2018								Fair value at December 31, 2017
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS
Private equity investments	$	—	$	—	$	—	$	—	$	—	$	—	$	1	$	1
Impaired loans	—		23		—		23		—		9		—		9
Other real estate owned	—		1		—		1		—		—		—		—
Total	$	—	$	24	$	—	$	24	$	—	$	9	$	1	$	10

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

The previous fair values may not be current as of the dates indicated, but rather as of the date the fair value change occurred, such as a charge for impairment. Accordingly, carrying values may not equal current fair value.

	Gains (losses) from fair value changes
(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
ASSETS
Private equity investments	$	—		$	—		$	—		$	(1	)
Impaired loans	(9		)	(1		)	(15		)	(8		)
Other real estate owned	—			—			(1		)	—
Total	$	(9	)	$	(1	)	$	(16	)	$	(9	)

During the three months ended September 30, we recognized an insignificant amount of net gains in 2018 and $1 million2017 from the sale of other real estate owned (“OREO”) properties. During the nine months endedSeptember 30, we recognized approximately $1 million of net gains in 2018 and $2 million in 2017 from the sale of OREO properties that had a carrying value at the time of sale of approximately $3 million and $5 million during the nine months endedSeptember 30, 2018 and 2017, respectively. Previous to their sale in these periods, we recognized impairment on these properties of an insignificant amount in 2018 and 2017.

Private equity investments carried at cost were measured at fair value for impairment purposes according to the methodology previously discussed for these investments. Amounts of PEIs carried at cost were $11 million at September 30, 2018 and $10 million at December 31, 2017. Amounts of other noninterest-bearing investments carried at cost were $311 million at September 30, 2018 and $338 million at December 31, 2017, which were comprised of Federal Reserve and Federal Home Loan Bank (“FHLB”) stock. Private equity investments accounted for using the equity method were $34 million at September 30, 2018 and $36 million at December 31, 2017.

Impaired (or nonperforming) loans that are collateral-dependent were measured at fair value based on the fair value of the collateral. OREO was measured initially at fair value based on collateral appraisals at the time of transfer and subsequently at the lower of cost or fair value. For additional information regarding the measurement of fair value for impaired loans, collateral-dependent loans, and OREO, see Note 3 of our 2017 Annual Report on Form 10-K.

Fair Value of Certain Financial Instruments

Following is a summary of the carrying values and estimated fair values of certain financial instruments:

	September 30, 2018					December 31, 2017
(In millions)	Carrying value		Estimated fair value		Level	Carrying value		Estimated fair value		Level
Financial assets:
HTM investment securities	$	751	$	734	2	$	770	$	762	2
Loans and leases (including loans held for sale), net of allowance	45,391		44,452		3	44,306		44,226		3
Financial liabilities:
Time deposits	4,256		4,231		2	3,115		3,099		2
Other short-term borrowings	2,900		2,900		2	3,600		3,600		2
Long-term debt	879		885		2	383		402		2

This summary excludes financial assets and liabilities for which carrying value approximates fair value and financial instruments that are recorded at fair value on a recurring basis. With the adoption of ASU 2016-01, we have updated our process for estimating the fair value for our loans and leases, net of allowance. Our updated process identifies an exit price using current origination rates, making certain adjustments based on credit and utilizing publicly available rates and indices. For additional information regarding the financial instruments within the scope of this disclosure, and the methods and significant assumptions used to estimate their fair value, see Note 3 of our 2017 Annual Report on Form 10-K.

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4. OFFSETTING ASSETS AND LIABILITIES

Gross and net information for selected financial instruments in the balance sheet is as follows:

	September 30, 2018
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	781	$	(221	)	$	560	$	—		$	—		$	560
Derivatives (included in other assets)	23		—			23		(13		)	(8		)	2
Total assets	$	804	$	(221	)	$	583	$	(13	)	$	(8	)	$	562
Liabilities:
Federal funds and other short-term borrowings	$	4,001	$	(221	)	$	3,780	$	—		$	—		$	3,780
Derivatives (included in other liabilities)	76		—			76		(13		)	—			63
Total Liabilities	$	4,077	$	(221	)	$	3,856	$	(13	)	$	—		$	3,843

	December 31, 2017
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	809	$	(295	)	$	514	$	—		$	—		$	514
Derivatives (included in other assets)	38		—			38		(9		)	(1		)	28
Total assets	$	847	$	(295	)	$	552	$	(9	)	$	(1	)	$	542
Liabilities:
Federal funds and other short-term borrowings	$	5,271	$	(295	)	$	4,976	$	—		$	—		$	4,976
Derivatives (included in other liabilities)	40		—			40		(9		)	(6		)	25
Total Liabilities	$	5,311	$	(295	)	$	5,016	$	(9	)	$	(6	)	$	5,001

Security repurchase and reverse repurchase (“resell”) agreements are offset, when applicable, in the balance sheet according to master netting agreements. Security repurchase agreements are included with “Federal funds and other short-term borrowings.” Derivative instruments may be offset under their master netting agreements; however, for accounting purposes, we present these items on a gross basis in the Bank’s balance sheet. See Note 7 for further information regarding derivative instruments.

5. INVESTMENTS

Investment Securities

Securities are classified as HTM, AFS or trading. HTM securities, which management has the intent and ability to hold until maturity, are carried at amortized cost. AFS securities are carried at fair value and unrealized gains and losses are reported as net increases or decreases to accumulated other comprehensive income (“AOCI”). Realized gains and losses on AFS securities are determined by using the cost basis of each individual security. Trading securities are carried at fair value with gains and losses recognized in current period earnings. The purchase premiums and discounts for both HTM and AFS securities are amortized and accreted at a constant effective yield to the contractual maturity date and no assumption is made concerning prepayments. As principal prepayments occur, the portion of the unamortized premium or discount associated with the principal reduction is recognized in interest

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income in the period the principal is reduced. Note 3 of our 2017 Annual Report on Form 10-K discusses the process to estimate fair value for investment securities.

	September 30, 2018
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	751	$	4	$	21	$	734
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,480		—		32		1,448
Agency guaranteed mortgage-backed securities	10,159		6		341		9,824
Small Business Administration loan-backed securities	2,069		1		50		2,020
Municipal securities	1,313		1		30		1,284
Other debt securities	25		—		1		24
Total available-for-sale	15,071		8		454		14,625
Total investment securities	$	15,822	$	12	$	475	$	15,359

	December 31, 2017
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	770	$	5	$	13	$	762
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,830		1		13		1,818
Agency guaranteed mortgage-backed securities	9,798		9		141		9,666
Small Business Administration loan-backed securities	2,227		10		15		2,222
Municipal securities	1,336		9		11		1,334
Other debt securities	25		—		1		24
Total available-for-sale debt securities	15,241		29		181		15,089
Money market mutual funds and other	72		—		—		72
Total available-for-sale	15,313		29		181		15,161
Total investment securities	$	16,083	$	34	$	194	$	15,923

Maturities

The amortized cost and estimated fair value of investment debt securities are shown subsequently as of September 30, 2018, by expected timing of principal payments. Actual principal payments may differ from contractual or expected principal payments because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	September 30, 2018
	Held-to-maturity				Available-for-sale
(In millions)	Amortized cost		Estimated fair value		Amortized cost		Estimated fair value
Due in one year or less	$	201	$	199	$	1,572	$	1,528
Due after one year through five years	356		349		4,874		4,733
Due after five years through ten years	139		135		4,650		4,509
Due after ten years	55		51		3,975		3,855
Total	$	751	$	734	$	15,071	$	14,625

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The following is a summary of the amount of gross unrealized losses for debt securities and the estimated fair value by length of time the securities have been in an unrealized loss position:

	September 30, 2018
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	4	$	227	$	17	$	343	$	21	$	570
Available-for-sale
U.S. Treasury securities	—		25		—		—		—		25
U.S. Government agencies and corporations:
Agency securities	20		970		12		354		32		1,324
Agency guaranteed mortgage-backed securities	92		3,821		249		5,354		341		9,175
Small Business Administration loan-backed securities	25		1,414		25		559		50		1,973
Municipal securities	15		834		15		331		30		1,165
Other	—		—		1		14		1		14
Total available-for-sale	152		7,064		302		6,612		454		13,676
Total	$	156	$	7,291	$	319	$	6,955	$	475	$	14,246

	December 31, 2017
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value
Held-to-maturity
Municipal securities	$	3	$	263	$	10	$	292	$	13	$	555
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	6		808		7		808		13		1,616
Agency guaranteed mortgage-backed securities	29		3,609		112		4,721		141		8,330
Small Business Administration loan-backed securities	3		408		12		649		15		1,057
Municipal securities	6		554		5		230		11		784
Other	—		—		1		14		1		14
Total available-for-sale	44		5,379		137		6,422		181		11,801
Total	$	47	$	5,642	$	147	$	6,714	$	194	$	12,356

At September 30, 2018 and December 31, 2017, respectively, 676 and 667 HTM and 3,018 and 2,262 AFS investment securities were in an unrealized loss position.

Other-Than-Temporary Impairment

The Bank did not recognize any other-than-temporary impairment (“OTTI”) on its investment securities portfolio during the first nine months of 2018. We review investment securities on a quarterly basis for the presence of OTTI. Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At September 30, 2018, we did not have an intent to sell identified securities with unrealized losses or initiate such sales, and we believe it is not more likely than not we would be required to sell such securities before recovery of their amortized cost basis. For additional information on our policy and evaluation process relating to OTTI, see Note 5 of our 2017 Annual Report on Form 10-K.

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The following summarizes gains and losses that were recognized in the statement of income:

	Three Months Ended September 30,									Nine Months Ended September 30,
	2018					2017				2018					2017
(In millions)	Gross gains		Gross losses			Gross gains		Gross losses		Gross gains		Gross losses			Gross gains		Gross losses
Investment securities:
Other noninterest-bearing investments	$	4	$	5		$	5	$	—	$	9	$	10		$	20	$	7
Net gains (losses) 1			$	(1	)			$	5			$	(1	)			$	13

¹ Net gains (losses) were recognized in securities gains (losses), net in the statement of income.

Interest income by security type is as follows:

	Three Months Ended September 30,
(In millions)	2018						2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	3	$	4	$	7	$	2	$	3	$	5
Available-for-sale	73		6		79		72		6		78
Trading	—		—		—		1		—		1
Total	$	76	$	10	$	86	$	75	$	9	$	84

	Nine Months Ended September 30,
(In millions)	2018						2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	8	$	11	$	19	$	7	$	10	$	17
Available-for-sale	216		19		235		209		18		227
Trading	3		—		3		2		—		2
Total	$	227	$	30	$	257	$	218	$	28	$	246

Investment securities with a carrying value of $2.1 billion at both September 30, 2018 andDecember 31, 2017 were pledged to secure public and trust deposits, advances, and for other purposes as required by law. Securities are also pledged as collateral for security repurchase agreements.

Private Equity Investments

Effect of Volcker Rule

The Bank’s PEIs are subject to the provisions of the Dodd-Frank Wall Street Reform and Consumer Protection Act (“Dodd-Frank Act”). The Volcker Rule of the Dodd-Frank Act prohibits banks from holding PEIs, except for SBIC funds and certain other permitted exclusions, beyond a required deadline. Of the recorded PEIs of $148 million at September 30, 2018, approximately $3 million remain prohibited by the Volcker Rule. At September 30, 2018, we have $31 million of unfunded commitments for PEIs, of which approximately $2 million relate to prohibited PEIs. We currently do not believe that this divestiture requirement will ultimately have a material impact on our financial statements. See other discussions related to private equity investments in Note 3.

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6. LOANS AND ALLOWANCE FOR CREDIT LOSSES

Loans and Loans Held for Sale

Loans are summarized as follows according to major portfolio segment and specific loan class:

(In millions)	September 30, 2018		December 31, 2017
Loans held for sale	$	61	$	44
Commercial:
Commercial and industrial	$	14,096	$	14,003
Leasing	332		364
Owner-occupied	7,548		7,288
Municipal	1,563		1,271
Total commercial	23,539		22,926
Commercial real estate:
Construction and land development	2,295		2,021
Term	8,752		9,103
Total commercial real estate	11,047		11,124
Consumer:
Home equity credit line	2,884		2,777
1-4 family residential	7,039		6,662
Construction and other consumer real estate	644		597
Bankcard and other revolving plans	483		509
Other	174		185
Total consumer	11,224		10,730
Total loans 1	$	45,810	$	44,780

¹Loans are presented net of unearned income, unamortized purchase discounts and premiums, and net deferred loan fees and costs totaling $42 million and $43 million at September 30, 2018 and December 31, 2017, respectively.

Municipal loans generally include loans to state and local governments (“municipalities”) with the debt service being repaid from general funds or pledged revenues of the municipal entity, or to private commercial entities or 501(c)(3) not-for-profit entities utilizing a pass-through municipal entity to achieve favorable tax treatment.

Land development loans included in the construction and land development loan class were $224 million at September 30, 2018 and $220 million at December 31, 2017.

Loans with a carrying value of approximately $23.4 billion at September 30, 2018 and $25.6 billion at December 31, 2017 have been pledged at the Federal Reserve or the FHLB of Des Moines as collateral for current and potential borrowings.

We sold loans totaling $152 million and $464 million for the three and nine months endedSeptember 30, 2018 and $146 million and $696 million for the three and nine months endedSeptember 30, 2017, respectively, that were classified as loans held for sale. The sold loans were derecognized from the balance sheet. Loans classified as loans held for sale primarily consist of conforming residential mortgages and the guaranteed portion of SBA loans. The loans are mainly sold to U.S. government agencies or participated to third parties. At times, we have continuing involvement in the transferred loans in the form of servicing rights or a guarantee from the respective issuer. Amounts added to loans held for sale during these same periods was $184 million and $584 million for the three and nine months endedSeptember 30, 2018 and $176 million and $640 million for the three and nine months endedSeptember 30, 2017, respectively. See Note 5 for further information regarding guaranteed securities.

The principal balance of sold loans for which we retain servicing was approximately $2.2 billion at both September 30, 2018 and December 31, 2017. Income from loans sold, excluding servicing, was $3 million and $10

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million for the three and nine months endedSeptember 30, 2018, and $1 million and $9 million for the three and nine months endedSeptember 30, 2017, respectively.

Allowance for Credit Losses

The allowance for credit losses (“ACL”) consists of the allowance for loan and lease losses (“ALLL”) and the reserve for unfunded lending commitments (“RULC”). The ALLL represents our estimate of probable and estimable losses inherent in the loan and lease portfolio as of the balance sheet date. We also estimate a reserve for potential losses associated with off-balance sheet commitments, including standby letters of credit. We determine the RULC using the same procedures and methodologies that we use for the ALLL.

For additional information regarding our policies and methodologies used to estimate the ACL, see Note 6 of our 2017 Annual Report on Form 10-K.

Changes in the allowance for credit losses are summarized as follows:
	Three Months Ended September 30, 2018
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	321		$	122		$	47	$	490
Provision for loan losses	(11		)	(5		)	5		(11		)
Gross loan and lease charge-offs	8			5			4		17
Recoveries	12			3			3		18
Net loan and lease charge-offs (recoveries)	(4		)	2			1		(1		)
Balance at end of period	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments
Balance at beginning of period	$	43		$	15		$	—	$	58
Provision for unfunded lending commitments	(1		)	1			—		—
Balance at end of period	$	42		$	16		$	—	$	58
Total allowance for credit losses at end of period
Allowance for loan losses	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments	42			16			—		58
Total allowance for credit losses	$	356		$	131		$	51	$	538

	Nine Months Ended September 30, 2018
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	371		$	103		$	44	$	518
Provision for loan losses	(69		)	9			14		(46		)
Gross loan and lease charge-offs	38			5			13		56
Recoveries	50			8			6		64
Net loan and lease charge-offs (recoveries)	(12		)	(3		)	7		(8		)
Balance at end of period	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments
Balance at beginning of period	$	48		$	10		$	—	$	58
Provision for unfunded lending commitments	(6		)	6			—		—
Balance at end of period	$	42		$	16		$	—	$	58
Total allowance for credit losses at end of period
Allowance for loan losses	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments	42			16			—		58
Total allowance for credit losses	$	356		$	131		$	51	$	538

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	Three Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	393		$	116		$	35	$	544
Provision for loan losses	(4		)	(7		)	16		5
Gross loan and lease charge-offs	16			4			5		25
Recoveries	12			2			3		17
Net loan and lease charge-offs (recoveries)	4			2			2		8
Balance at end of period	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	53		$	10		$	—	$	63
Provision for unfunded lending commitments	(4		)	—			—		(4		)
Balance at end of period	$	49		$	10		$	—	$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments	49			10			—		59
Total allowance for credit losses	$	434		$	117		$	49	$	600

	Nine Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	420		$	116		$	31	$	567
Provision for loan losses	27			(15		)	23		35
Gross loan and lease charge-offs	98			6			13		117
Recoveries	36			12			8		56
Net loan and lease charge-offs (recoveries)	62			(6		)	5		61
Balance at end of period	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	54		$	11		$	—	$	65
Provision for unfunded lending commitments	(5		)	(1		)	—		(6		)
Balance at end of period	$	49		$	10		$	—	$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments	49			10			—		59
Total allowance for credit losses	$	434		$	117		$	49	$	600

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The ALLL and outstanding loan balances according to the Bank’s impairment method are summarized as follows:
	September 30, 2018
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	10	$	1	$	3	$	14
Collectively evaluated for impairment	304		114		48		466
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	314	$	115	$	51	$	480
Outstanding loan balances:
Individually evaluated for impairment	$	201	$	65	$	74	$	340
Collectively evaluated for impairment	23,338		10,982		11,150		45,470
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	23,539	$	11,047	$	11,224	$	45,810

	December 31, 2017
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	26	$	1	$	4	$	31
Collectively evaluated for impairment	345		102		40		487
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	371	$	103	$	44	$	518
Outstanding loan balances:
Individually evaluated for impairment	$	314	$	69	$	76	$	459
Collectively evaluated for impairment	22,598		11,048		10,648		44,294
Purchased loans with evidence of credit deterioration	14		7		6		27
Total	$	22,926	$	11,124	$	10,730	$	44,780

Nonaccrual and Past Due Loans

Loans are generally placed on nonaccrual status when payment in full of principal and interest is not expected, or the loan is 90 days or more past due as to principal or interest, unless the loan is both well secured and in the process of collection. For further discussion of our policies and processes regarding nonaccrual and past due loans, see Note 6 of our 2017 Annual Report on Form 10-K.

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Nonaccrual loans are summarized as follows:
(In millions)	September 30, 2018		December 31, 2017
Loans held for sale	$	—	$	12
Commercial:
Commercial and industrial	$	112	$	195
Leasing	2		8
Owner-occupied	66		90
Municipal	1		1
Total commercial	181		294
Commercial real estate:
Construction and land development	—		4
Term	46		36
Total commercial real estate	46		40
Consumer:
Home equity credit line	13		13
1-4 family residential	47		55
Construction and other consumer real estate	—		—
Bankcard and other revolving plans	1		—
Other	—		—
Total consumer loans	61		68
Total	$	288	$	402

Past due loans (accruing and nonaccruing) are summarized as follows:
	September 30, 2018
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	61	$	—	$	—	$	—	$	61	$	—	$	—
Commercial:
Commercial and industrial	$	14,006	$	40	$	50	$	90	$	14,096	$	6	$	63
Leasing	331		—		1		1		332		—		1
Owner-occupied	7,500		26		22		48		7,548		2		41
Municipal	1,563		—		—		—		1,563		—		1
Total commercial	23,400		66		73		139		23,539		8		106
Commercial real estate:
Construction and land development	2,295		—		—		—		2,295		—		—
Term	8,728		16		8		24		8,752		3		32
Total commercial real estate	11,023		16		8		24		11,047		3		32
Consumer:
Home equity credit line	2,872		5		7		12		2,884		—		4
1-4 family residential	7,008		15		16		31		7,039		—		23
Construction and other consumer real estate	634		10		—		10		644		—		—
Bankcard and other revolving plans	478		3		2		5		483		1		—
Other	173		1		—		1		174		—		—
Total consumer loans	11,165		34		25		59		11,224		1		27
Total	$	45,588	$	116	$	106	$	222	$	45,810	$	12	$	165

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	December 31, 2017
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	44	$	—	$	—	$	—	$	44	$	—	$	12
Commercial:
Commercial and industrial	$	13,887	$	60	$	56	$	116	$	14,003	$	13	$	146
Leasing	363		1		—		1		364		—		8
Owner-occupied	7,219		29		40		69		7,288		4		49
Municipal	1,271		—		—		—		1,271		—		1
Total commercial	22,740		90		96		186		22,926		17		204
Commercial real estate:
Construction and land development	2,014		3		4		7		2,021		—		—
Term	9,079		13		11		24		9,103		2		25
Total commercial real estate	11,093		16		15		31		11,124		2		25
Consumer:
Home equity credit line	2,763		9		5		14		2,777		—		5
1-4 family residential	6,621		16		25		41		6,662		1		27
Construction and other consumer real estate	590		6		1		7		597		1		—
Bankcard and other revolving plans	506		2		1		3		509		1		—
Other	184		1		—		1		185		—		—
Total consumer loans	10,664		34		32		66		10,730		3		32
Total	$	44,497	$	140	$	143	$	283	$	44,780	$	22	$	261

¹  Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Credit Quality Indicators

In addition to the past due and nonaccrual criteria, we also analyze loans using loan risk-grading systems, which vary based on the size and type of credit risk exposure. The internal risk grades assigned to loans follow our definitions of Pass, Special Mention, Sub-standard, and Doubtful, which are consistent with published definitions of regulatory risk classifications. For further discussion of our policies and processes regarding credit quality indicators and internal loan risk-grading, see Note 6 of our 2017 Annual Report on Form 10-K.

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Outstanding loan balances (accruing and nonaccruing) categorized by these credit quality classifications are summarized as follows:

	September 30, 2018
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	13,416	$	311	$	369	$	—	$	14,096
Leasing	318		10		4		—		332
Owner-occupied	7,253		84		211		—		7,548
Municipal	1,536		4		23		—		1,563
Total commercial	22,523		409		607		—		23,539		$	314
Commercial real estate:
Construction and land development	2,284		11		—		—		2,295
Term	8,631		18		103		—		8,752
Total commercial real estate	10,915		29		103		—		11,047		115
Consumer:
Home equity credit line	2,866		—		18		—		2,884
1-4 family residential	6,988		—		51		—		7,039
Construction and other consumer real estate	642		—		2		—		644
Bankcard and other revolving plans	480		—		3		—		483
Other	174		—		—		—		174
Total consumer loans	11,150		—		74		—		11,224		51
Total	$	44,588	$	438	$	784	$	—	$	45,810	$	480

	December 31, 2017
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	13,001	$	395	$	606	$	1	$	14,003
Leasing	342		6		16		—		364
Owner-occupied	6,920		93		275		—		7,288
Municipal	1,257		13		1		—		1,271
Total commercial	21,520		507		898		1		22,926		$	371
Commercial real estate:
Construction and land development	2,002		15		4		—		2,021
Term	8,816		138		149		—		9,103
Total commercial real estate	10,818		153		153		—		11,124		103
Consumer:
Home equity credit line	2,759		—		18		—		2,777
1-4 family residential	6,602		—		60		—		6,662
Construction and other consumer real estate	596		—		1		—		597
Bankcard and other revolving plans	507		—		2		—		509
Other	185		—		—		—		185
Total consumer loans	10,649		—		81		—		10,730		44
Total	$	42,987	$	660	$	1,132	$	1	$	44,780	$	518

Impaired Loans

Loans are considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due in accordance with the contractual terms of the loan agreement, including scheduled interest payments. Payments received on impaired loans that are accruing are recognized in interest income, according to the contractual loan agreement. Payments received on impaired loans that are on nonaccrual are not recognized in interest income, but are applied as a reduction to the principal outstanding. The amount of interest

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income recognized on a cash basis during the time the loans were impaired within the three months ended September 30, 2018 and 2017 was not significant. For additional information regarding our policies and methodologies used to evaluate impaired loans, see Note 6 of our 2017 Annual Report on Form 10-K.

Information on impaired loans individually evaluated is summarized as follows, including the average recorded investment and interest income recognized for the three and nine months endedSeptember 30, 2018 and 2017:

	September 30, 2018
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	170	$	72	$	47	$	119	$	8
Owner-occupied	66		39		21		60		2
Municipal	1		1		—		1		—
Total commercial	237		112		68		180		10
Commercial real estate:
Construction and land development	1		—		1		1		—
Term	59		44		5		49		—
Total commercial real estate	60		44		6		50		—
Consumer:
Home equity credit line	16		12		2		14		3
1-4 family residential	70		33		26		59		—
Construction and other consumer real estate	2		1		—		1		—
Other	—		—		—		—		—
Total consumer loans	88		46		28		74		3
Total	$	385	$	202	$	102	$	304	$	13

	December 31, 2017
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	293	$	80	$	142	$	222	$	24
Owner-occupied	120		79		23		102		2
Municipal	1		1		—		1		—
Total commercial	414		160		165		325		26
Commercial real estate:
Construction and land development	8		4		2		6		—
Term	56		36		12		48		—
Total commercial real estate	64		40		14		54		—
Consumer:
Home equity credit line	25		13		9		22		—
1-4 family residential	67		28		29		57		4
Construction and other consumer real estate	2		1		1		2		—
Other	1		1		—		1		—
Total consumer loans	95		43		39		82		4
Total	$	573	$	243	$	218	$	461	$	30

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	Three Months Ended September 30, 2018				Nine Months Ended September 30, 2018
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	124	$	—	$	108	$	—
Owner-occupied	51		—		46		8
Municipal	1		—		1		—
Total commercial	176		—		155		8
Commercial real estate:
Construction and land development	1		—		1		—
Term	49		—		50		1
Total commercial real estate	50		—		51		1
Consumer:
Home equity credit line	14		—		13		—
1-4 family residential	58		—		53		—
Construction and other consumer real estate	1		—		1		—
Other	—		—		—		—
Total consumer loans	73		—		67		—
Total	$	299	$	—	$	273	$	9

	Three Months Ended September 30, 2017				Nine Months Ended September 30, 2017
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	356	$	1	$	311	$	5
Owner-occupied	104		2		101		5
Municipal	1		—		1		—
Total commercial	461		3		413		10
Commercial real estate:
Construction and land development	10		—		11		—
Term	53		1		58		11
Total commercial real estate	63		1		69		11
Consumer:
Home equity credit line	21		—		21		1
1-4 family residential	53		1		53		1
Construction and other consumer real estate	2		—		2		—
Other	1		—		1		—
Total consumer loans	77		1		77		2
Total	$	601	$	5	$	559	$	23

Modified and Restructured Loans

Loans may be modified in the normal course of business for competitive reasons or to strengthen the Bank’s position. Loan modifications and restructurings may also occur when the borrower experiences financial difficulty and needs temporary or permanent relief from the original contractual terms of the loan. Loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for which the Bank has granted a concession that it would not otherwise consider, are considered troubled debt restructurings (“TDRs”). For further discussion of our policies and processes regarding TDRs, see Note 6 of our 2017 Annual Report on Form 10-K.

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Selected information on TDRs that includes the recorded investment on an accruing and nonaccruing basis by loan class and modification type is summarized in the following schedules:

	September 30, 2018
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	4	$	—	$	—	$	15	$	7	$	26
Owner-occupied	1		2		—		—		1		16		20
Municipal	—		—		—		—		—		—		—
Total commercial	1		6		—		—		16		23		46
Commercial real estate:
Construction and land development	—		—		—		—		—		1		1
Term	4		2		—		1		—		6		13
Total commercial real estate	4		2		—		1		—		7		14
Consumer:
Home equity credit line	—		2		8		—		—		3		13
1-4 family residential	1		1		6		—		2		30		40
Construction and other consumer real estate	—		—		—		—		—		1		1
Total consumer loans	1		3		14		—		2		34		54
Total accruing	6		11		14		1		18		64		114
Nonaccruing
Commercial:
Commercial and industrial	—		6		1		1		12		38		58
Owner-occupied	1		2		—		1		1		5		10
Municipal	—		—		—		—		—		1		1
Total commercial	1		8		1		2		13		44		69
Commercial real estate:
Term	3		—		—		2		4		1		10
Total commercial real estate	3		—		—		2		4		1		10
Consumer:
Home equity credit line	—		—		1		—		—		—		1
1-4 family residential	—		—		1		—		1		8		10
Total consumer loans	—		—		2		—		1		8		11
Total nonaccruing	4		8		3		4		18		53		90
Total	$	10	$	19	$	17	$	5	$	36	$	117	$	204

¹ Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

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	December 31, 2017
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	2	$	—	$	—	$	12	$	33	$	47
Owner-occupied	1		1		—		—		7		14		23
Total commercial	1		3		—		—		19		47		70
Commercial real estate:
Construction and land development	—		—		—		—		—		2		2
Term	6		—		—		1		—		7		14
Total commercial real estate	6		—		—		1		—		9		16
Consumer:
Home equity credit line	—		2		9		—		1		3		15
1-4 family residential	1		—		6		1		2		26		36
Construction and other consumer real estate	—		1		—		—		—		1		2
Total consumer loans	1		3		15		1		3		30		53
Total accruing	8		6		15		2		22		86		139
Nonaccruing
Commercial:
Commercial and industrial	—		3		5		2		28		24		62
Owner-occupied	1		2		—		1		1		5		10
Municipal	—		1		—		—		—		—		1
Total commercial	1		6		5		3		29		29		73
Commercial real estate:
Term	2		—		—		—		—		3		5
Total commercial real estate	2		—		—		—		—		3		5
Consumer:
Home equity credit line	—		—		1		—		—		—		1
1-4 family residential	—		—		2		—		1		5		8
Total consumer loans	—		—		3		—		1		5		9
Total nonaccruing	3		6		8		3		30		37		87
Total	$	11	$	12	$	23	$	5	$	52	$	123	$	226

¹  Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

Unfunded lending commitments on TDRs amounted to approximately $5 million at September 30, 2018 and $22 million at December 31, 2017.

The total recorded investment of all TDRs in which interest rates were modified below market was $90 million at September 30, 2018 and $120 million at December 31, 2017. These loans are included in the previous schedule in the columns for interest rate below market and multiple modification types.

The net financial impact on interest income due to interest rate modifications below market for accruing TDRs for the three and nine months endedSeptember 30, 2018 and 2017 was not significant.

On an ongoing basis, we monitor the performance of all TDRs according to their restructured terms. Subsequent payment default is defined in terms of delinquency, when principal or interest payments are past due 90 days or more for commercial loans, or 60 days or more for consumer loans.

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The recorded investment of accruing and nonaccruing TDRs that had a payment default during the period listed below (and are still in default at period end) and are within 12 months or less of being modified as TDRs is as follows:

	Three Months Ended September 30, 2018						Nine Months Ended September 30, 2018
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing		Total
Commercial:
Commercial and industrial	$	—	$	1	$	1	$	—	$	5	$	5
Owner-occupied	—		—		—		—		1		1
Total commercial	—		1		1		—		6		6
Commercial real estate:
Term	2		—		2		2		—		2
Total commercial real estate	2		—		2		2		—		2
Total	$	2	$	1	$	3	$	2	$	6	$	8

	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing		Total
Commercial:
Commercial and industrial	$	—	$	1	$	1	$	—	$	1	$	1
Owner-occupied	—		—		—		—		1		1
Total commercial	—		1		1		—		2		2
Total	$	—	$	1	$	1	$	—	$	2	$	2

Note: Total loans modified as TDRs during the 12 months previous to September 30, 2018 and 2017 were $99 millionand $84 million, respectively.

At September 30, 2018 and December 31, 2017, the amount of foreclosed residential real estate property held by the Bank was approximately $2 million and less than $1 million, and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure was approximately $10 million for both periods, respectively.

Concentrations of Credit Risk

Credit risk is the possibility of loss from the failure of a borrower, guarantor, or another obligor to fully perform under the terms of a credit-related contract. We perform an ongoing analysis of our loan portfolio to evaluate whether there is any significant exposure to any concentrations of credit risk. See Note 6 of our 2017 Annual Report on Form 10-K for further discussion of our evaluation of credit risk concentrations. See also Note 7 of our 2017 Annual Report on Form 10-K for a discussion of counterparty risk associated with the Bank’s derivative transactions.

7. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Objectives and Accounting

The Bank is exposed to certain risk arising from both its business operations and economic conditions. Our objectives in using derivatives are to add stability to interest income or expense, to modify the duration of specific assets or liabilities as we consider advisable, to manage exposure to interest rate movements or other identified risks, and/or to directly offset derivatives sold to our customers. For a detailed discussion of the use of and accounting policies regarding derivative instruments, see Note 7 of our 2017 Annual Report on Form 10-K.

Collateral and Credit Risk

Exposure to credit risk arises from the possibility of nonperformance by counterparties. No significant losses on derivative instruments have occurred as a result of counterparty nonperformance. For a more detailed discussion of collateral and credit risk related to our derivative contracts, see Note 7 of our 2017 Annual Report on Form 10-K.

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Our derivative contracts require us to pledge collateral for derivatives that are in a net liability position at a given balance sheet date. Certain of these derivative contracts contain credit-risk-related contingent features that include the requirement to maintain a minimum debt credit rating. We may be required to pledge additional collateral if a credit-risk-related feature were triggered, such as a downgrade of our credit rating. However, in past situations, not all counterparties have demanded that additional collateral be pledged when provided for by the contractual terms. At September 30, 2018, the fair value of our derivative liabilities was $76 million, for which we were required to pledge cash collateral of approximately $38 million in the normal course of business. If our credit rating were downgraded one notch by either Standard & Poor’s or Moody’s at September 30, 2018, there would likely be no additional collateral required to be pledged. As a result of the Dodd-Frank Act, all newly eligible derivatives entered into are cleared through a central clearinghouse. Derivatives that are centrally cleared do not have credit-risk-related features that require additional collateral if our credit rating were downgraded.

Derivative Amounts

Selected information with respect to notional amounts and recorded gross fair values at September 30, 2018 and December 31, 2017, and the related gain (loss) of derivative instruments for the three and nine months endedSeptember 30, 2018 and 2017 is summarized as follows:

	September 30, 2018						December 31, 2017
	Notional amount		Fair value				Notional amount		Fair value
(In millions)			Other assets		Other liabilities				Other assets		Other liabilities
Derivatives designated as hedging instruments:
Cash flow hedges:
Interest rate swaps	$	713	$	—	$	—	$	1,138	$	—	$	—
Fair value hedges:
Interest rate swaps	500		—		—		—		—		—
Total derivatives designated as hedging instruments	1,213		—		—		1,138		—		—
Derivatives not designated as hedging instruments:
Interest rate swaps and forwards	237		1		—		223		1		—
Interest rate swaps for customers 1	5,345		18		73		4,550		28		33
Foreign exchange	324		4		3		913		9		7
Total derivatives not designated as hedging instruments	5,906		23		76		5,686		38		40
Total derivatives	$	7,119	$	23	$	76	$	6,824	$	38	$	40

¹ Notional amounts include both the customer swaps and the offsetting derivative contracts.

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2018										Nine Months Ended September 30, 2018
(In millions)	OCI			Reclassified from AOCI to interest income			Noninterest income (expense)		Offset to interest expense		OCI			Reclassified from AOCI to interest income			Noninterest income (expense)		Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	(1	)	$	(1	)					$	(8	)	$	(3	)
Derivatives not designated as hedging instruments:
Interest rate swaps for customers							$	8									$	12
Foreign exchange							6										13
Total derivatives	$	(1	)	$	(1	)	$	14	$	—	$	(8	)	$	(3	)	$	25	$	—

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	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2017								Nine Months Ended September 30, 2017
(In millions)	OCI		Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense		OCI		Reclassified from AOCI to interest income		Noninterest income (expense)			Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	—	$	—					$	—	$	3
Derivatives not designated as hedging instruments:
Interest rate swaps and forward contracts					$	—							$	(1	)
Interest rate swaps for customers					4								8
Foreign exchange					4								12
Total derivatives	$	—	$	—	$	8	$	—	$	—	$	3	$	19		$	—

Note: These schedules are not intended to present at any given time the Bank’s long/short position with respect to its derivative contracts.

¹  Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2018, we estimate that $(6) million will be reclassified from AOCI into interest income

The following schedule presents derivatives used in fair value hedge accounting relationships, as well as pre-tax gains/(losses) recorded on such derivatives and the related hedged items for the periods presented.

	Gain/(loss) recorded in income
	Three Months Ended September 30, 2018							Three Months Ended September 30, 2017
(In millions)	Derivatives		Hedged items			Total income statement impact		Derivatives		Hedged items		Total income statement impact
Interest rate swaps1	$	1	$	(1	)	$	—	$	—	$	—	$	—

	Gain/(loss) recorded in income
	Nine Months Ended September 30, 2018							Nine Months Ended September 30, 2017
(In millions)	Derivatives		Hedged items			Total income statement impact		Derivatives		Hedged items		Total income statement impact
Interest rate swaps1	$	1	$	(1	)	$	—	$	—	$	—	$	—

¹  Consists of hedges of benchmark interest rate risk of fixed-rate long-term debt. Gains and losses were recorded in net interest income.

The following schedule provides selected information regarding the long-term debt in the statement of financial position in which the hedged item is included.

	Carrying amount of the hedged assets/(liabilities)					Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)
(In millions)	2018			2017		2018		2017
Long-term debt	$	(499	)	$	—	$	1	$	—

The fair value of derivative assets was reduced by a net credit valuation adjustment of $1 million and $4 million at September 30, 2018 and 2017, respectively. The adjustment for derivative liabilities was a decrease of $2 million and $1 million at September 30, 2018 and 2017, respectively. These adjustments are required to reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk.

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8. LONG-TERM DEBT AND SHAREHOLDERS’ EQUITY

Long-Term Debt

Long-term debt is summarized as follows:

(In millions)	September 30, 2018		December 31, 2017
Subordinated notes	$	247	$	247
Senior notes	632		135
Capital lease obligations	—		1
Total	$	879	$	383

The preceding carrying values represent the par value of the debt adjusted for any unamortized premium or discount or unamortized debt issuance costs as well as valuation adjustments for fair value swaps. During the third quarter of 2018, the Bank issued a $500 million senior note with an interest rate of 3.5% and a maturity date of August 27, 2021. The Bank intends to call, on the November 15, 2018 call date, $162 million of subordinated notes that mature on November 15, 2023.

Common Stock

On September 30, 2018, the Bank completed the merger of Zions Bancorporation, its former bank holding company, with, and into its subsidiary bank, formerly known as ZB, N.A. As a result of this merger, the Bank’s common stock now has a 0.001 par value, and is $192,169 at September 30, 2018.

Repurchases of Bank Common Stock

During the third quarter of 2018, we continued our common stock buyback program and repurchased 3.5 million shares of common stock outstanding with a fair value of $185 million at an average price of $52.86 per share. During the first nine months of 2018, we repurchased 7.8 million common shares outstanding with a fair value of $420 million at an average price of $53.84 per share. During the first nine months of 2017, we repurchased 4.7 million shares of common stock outstanding with a fair value of $205 million, at an average price of $43.72 per share. In October 2018, the Bank announced that the Board approved a plan to repurchase $250 million of common stock during the fourth quarter of 2018 and subsequently began the repurchases.

Common Stock Warrants

During the first nine months of 2018, 1.3 million shares of common stock were issued from the cashless exercise of 3.9 million common stock ZIONZ warrants. As of September 30, 2018, 1.9 million common stock ZIONZ warrants with an exercise price of $36.27 per share, were outstanding. These warrants expire on November 14, 2018 and were associated with the preferred stock issued under the Troubled Asset Relief Program, which was redeemed in 2012. Additionally, as of September 30, 2018, 29.3 million common stock ZIONW warrants, with an exercise price of $35.03, were outstanding. These warrants expire on May 22, 2020.

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Accumulated Other Comprehensive Income

Accumulated other comprehensive income (loss) was $(361) million at September 30, 2018 compared with $(139) million at December 31, 2017. Changes in AOCI by component are as follows:

(In millions)	Net unrealized gains (losses) on investment securities			Net unrealized gains (losses) on derivatives and other			Pension and post-retirement			Total
Nine Months Ended September 30, 2018
Balance at December 31, 2017	$	(114	)	$	(2	)	$	(23	)	$	(139	)
OCI (loss) before reclassifications, net of tax	(221		)	(3		)	—			(224		)
Amounts reclassified from AOCI, net of tax	—			2			—			2
OCI (loss)	(221		)	(1		)	—			(222		)
Balance at September 30, 2018	$	(335	)	$	(3	)	$	(23	)	$	(361	)
Income tax benefit included in OCI (loss)	$	(73	)	$	—		$	—		$	(73	)
Nine Months Ended September 30, 2017
Balance at December 31, 2016	$	(93	)	$	2		$	(31	)	$	(122	)
OCI before reclassifications, net of tax	65			2			—			67
Amounts reclassified from AOCI, net of tax	—			(2		)	—			(2		)
OCI	65			—			—			65
Balance at September 30, 2017	$	(28	)	$	2		$	(31	)	$	(57	)
Income tax expense included in OCI	$	40		$	—		$	—		$	40

	Amounts reclassified from AOCI 1					Amounts reclassified from AOCI 1					Statement of income (SI) Balance sheet (BS)
(In millions)	Three Months Ended September 30,					Nine Months Ended September 30,
Details about AOCI components	2018			2017		2018			2017			Affected line item
Net unrealized gains on derivative instruments	$	(1	)	$	—	$	(3	)	$	3	SI	Interest and fees on loans
Income tax expense	—			—		(1		)	1
Amounts Reclassified from AOCI	$	(1	)	$	—	$	(2	)	$	2

¹  Positive reclassification amounts indicate increases to earnings in the statement of income and decreases to balance sheet assets.

9. COMMITMENTS, GUARANTEES AND CONTINGENT LIABILITIES

Commitments and Guarantees

Contractual amounts of off-balance sheet financial instruments used to meet the financing needs of our customers are as follows:

(In millions)	September 30, 2018		December 31, 2017
Net unfunded commitments to extend credit 1	$	20,999	$	19,583
Standby letters of credit:
Financial	673		721
Performance	196		196
Commercial letters of credit	20		31
Total unfunded lending commitments	$	21,888	$	20,531

¹  Net of participations

The Bank’s 2017 Annual Report on Form 10-K contains further information about these commitments and guarantees including their terms and collateral requirements. At September 30, 2018, the Bank had recorded

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approximately $5 million as a liability for the guarantees associated with the standby letters of credit, which consisted of $1 million attributable to the RULC and $4 million of deferred commitment fees.

At September 30, 2018, we had unfunded commitments for PEIs of approximately $31 million. These obligations have no stated maturity. PEIs related to these commitments that are prohibited by the Volcker Rule were $2 million at September 30, 2018. See related discussions about these investments in Note 5.

Legal Matters

We are subject to litigation in court and arbitral proceedings, as well as proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies. Litigation may relate to lending, deposit and other customer relationships, vendor and contractual issues, employee matters, intellectual property matters, personal injuries and torts, regulatory and legal compliance, and other matters. While most matters relate to individual claims, we are also subject to putative class action claims and similar broader claims. Proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies may relate to our banking, investment advisory, trust, securities, and other products and services; our customers’ involvement in money laundering, fraud, securities violations and other illicit activities or our policies and practices relating to such customer activities; and our compliance with the broad range of banking, securities and other laws and regulations applicable to us. At any given time, we may be in the process of responding to subpoenas, requests for documents, data and testimony relating to such matters and engaging in discussions to resolve the matters.

As of September 30, 2018, we were subject to the following material litigation or governmental inquiries:

• a civil suit, Shou-En Wang v. CB&T, brought against us in the Superior Court for Los Angeles County, Central District in April 2016. The case relates to our depositor relationships with customers who were promoters of an investment program that allegedly misappropriated investors’ funds. This case is in an early phase, with initial motion practice and discovery having been completed, with additional motion practice and expert witness phases being underway.

• a civil suit, McFarland as Trustee for International Manufacturing Group v. CB&T, et. al., brought against us in the United States Bankruptcy Court for the Eastern District of California in May 2016. The Trustee seeks to recover loan payments previously repaid to us by our customer, International Manufacturing Group (“IMG”), alleging that IMG, along with its principal, obtained loans and made loan repayments in furtherance of an alleged Ponzi scheme. Initial motion practice has been completed and discovery is underway.

• a civil suit, JTS Communities, Inc. et. al v. CB&T, Jun Enkoji and Dawn Satow, brought against us in the Superior Court for Sacramento County, California in June 2017. In this case four investors in IMG seek to hold us liable for losses arising from their investments in that company, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi scheme. This case is in an early phase with initial motion practice having been completed and discovery is underway.

• a civil class action lawsuit, Evans v. CB&T, brought against us in the United States District Court for the Eastern District of California in May 2017. This case was filed on behalf of a class of up to 50 investors in IMG and seeks to hold us liable for losses of class members arising from their investments in IMG, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi scheme. In December 2017, the District Court dismissed all claims against the Bank. In January 2018, the plaintiff filed an appeal with the Court of Appeals for the Ninth Circuit. The appellate briefing process has been completed with a ruling anticipated in 2019.

• a Private Attorney General Act (“PAGA”) claim under California law, Lawson v. CB&T, brought against us in the Superior Court for the County of San Diego, California, in February 2016. In this case, the plaintiff alleges, on behalf of herself and other current or former employees of the Bank who worked in California on a non-exempt basis, violations by the Bank of California wage and hour laws. The case remains in the early stages of motion practice, to date mainly involving questions of venue and scope of employees covered by the PAGA claims. In March 2018, the Supreme Court of California granted review of an appeal from the intermediate

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appellate court decision requiring all aspects of the case to be heard in state court, rather than in arbitration. The appellate briefing process has been completed with a ruling anticipated in 2019.

• a civil case, Lifescan Inc. and Johnson & Johnson Health Care Services v. Jeffrey Smith, et al., brought against us in the United States District Court for the District of New Jersey in December 2017. In this case, certain manufacturers and distributors of medical products seek to hold us liable for allegedly fraudulent practices of a borrower of the Bank which filed for bankruptcy protection in 2017. The case is in early phase, with initial motion practice and discovery underway.

At least quarterly, we review outstanding and new legal matters, utilizing then available information. In accordance with applicable accounting guidance, if we determine that a loss from a matter is probable and the amount of the loss can be reasonably estimated, we establish an accrual for the loss. In the absence of such a determination, no accrual is made. Once established, accruals are adjusted to reflect developments relating to the matters.

In our review, we also assess whether we can determine the range of reasonably possible losses for significant matters in which we are unable to determine that the likelihood of a loss is remote. Because of the difficulty of predicting the outcome of legal matters, discussed subsequently, we are able to meaningfully estimate such a range only for a limited number of matters. Based on information available as of September 30, 2018, we estimated that the aggregate range of reasonably possible losses for those matters to be from $0 millionto roughly $15 million in excess of amounts accrued. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from this estimate. Those matters for which a meaningful estimate is not possible are not included within this estimated range and, therefore, this estimated range does not represent our maximum loss exposure.

Based on our current knowledge, we believe that our current estimated liability for litigation and other legal actions and claims, reflected in our accruals and determined in accordance with applicable accounting guidance, is adequate and that liabilities in excess of the amounts currently accrued, if any, arising from litigation and other legal actions and claims for which an estimate as previously described is possible, will not have a material impact on our financial condition, results of operations, or cash flows. However, in light of the significant uncertainties involved in these matters, and the very large or indeterminate damages sought in some of these matters, an adverse outcome in one or more of these matters could be material to our financial condition, results of operations, or cash flows for any given reporting period.

Any estimate or determination relating to the future resolution of litigation, arbitration, governmental or self-regulatory examinations, investigations or actions or similar matters is inherently uncertain and involves significant judgment. This is particularly true in the early stages of a legal matter, when legal issues and facts have not been well articulated, reviewed, analyzed, and vetted through discovery, preparation for trial or hearings, substantive and productive mediation or settlement discussions, or other actions. It is also particularly true with respect to class action and similar claims involving multiple defendants, matters with complex procedural requirements or substantive issues or novel legal theories, and examinations, investigations and other actions conducted or brought by governmental and self-regulatory agencies, in which the normal adjudicative process is not applicable. Accordingly, we usually are unable to determine whether a favorable or unfavorable outcome is remote, reasonably likely, or probable, or to estimate the amount or range of a probable or reasonably likely loss, until relatively late in the course of a legal matter, sometimes not until a number of years have elapsed. Accordingly, our judgments and estimates relating to claims will change from time to time in light of developments and actual outcomes will differ from our estimates. These differences may be material.

10. REVENUE RECOGNITION

Adoption of ASC Topic 606, “Revenue from Contracts with Customers”

On January 1, 2018, we adopted the accounting guidance in ASC Topic 606, “Revenue from Contracts with Customers” (“Topic 606”) using the modified retrospective method applied to those contracts with customers which were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts are not adjusted and continue to be reported in accordance

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with our historic accounting under Topic 605, “Revenue Recognition.” Upon adoption, the Bank has elected to use the following optional exemptions that are permitted under the Topic 606, which have been applied consistently to all contracts within all reporting periods presented:

• The Bank recognizes the incremental cost of obtaining a contract as an expense, when incurred, if the amortization period of the asset that the Bank would have recognized is one year or less.

• For performance obligations satisfied over time, if the Bank has a right to consideration from a customer in an amount that corresponds directly with the value to the customer of the Bank’s performance completed to date, the Bank will generally recognize revenue in the amount to which the Bank has a right to invoice.

• The Bank does not generally disclose information about its remaining performance obligations for those performance obligations that have an original expected duration of one year or less, or where the Bank recognizes revenue in the amount to which the Bank has a right to invoice.

The cumulative effect of adopting Topic 606 did not have a material impact to retained earnings as of January 1, 2018. The adoption of Topic 606 resulted in changes to our accounting policies, business processes, and internal controls to support the recognition, measurement and disclosure requirements under Topic 606.

Revenue Recognition

We derive our revenue primarily from Interest Income on Loans and Securities, which was more than three-quarters of our revenue in the third quarter of 2018. Only noninterest income is considered to be revenue from contracts with customers in scope of ASC 606. Revenue from contracts with customers is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. In addition, U.S. GAAP requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The following is a description of revenue from contracts with customers:

Service charges and fees on deposit accounts

Service charges and fees on deposit accounts typically consist of fees charged for providing customers with deposit services. These fees are primarily comprised of account analysis fees, insufficient funds fees, and other various fees on deposit accounts. Service charges on deposit accounts include fees earned in lieu of compensating balances, and fees earned for performing cash management services and other deposit account services. Service charges on deposit accounts in this revenue category are recognized over the period in which the related service is provided. Treasury Management fees are billed monthly based on services rendered for the month.

Other Service charges, commissions, and fees

Other service charges, commissions, and fees primarily consist of credit and debit card interchange fees, automated teller machine (“ATM”) services, and various account services such as wires, safe deposit box, check issuance and cashing services. Revenue is recognized as the services are rendered or upon completion of services.

The Bank’s card fee income includes interchange income from credit and debit cards and net fees earned from processing card transactions for merchants. Card income is recognized as earned. Reward program costs are recorded when the rewards are earned by the customer and presented as a reduction to interchange income.

The following schedule provides the major income categories within “Other Service charges, commissions and fees” that are in scope of ASC 606 for the three and nine months endedSeptember 30, 2018:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2018		2017		2018		2017
Card Fee Income	$	36	$	34	$	103	$	101
ATM Fees	2		2		7		7
Other service charges	4		4		11		11
Other Commissions and fees	5		4		15		11
Ending balance	$	47	$	44	$	136	$	130

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Wealth management and trust income

Wealth management and trust income is comprised of a variety of products, including but not limited to: corporate and personal trust income, wealth management commissions, portfolio services, and advisory services. Revenue is recognized as the services are rendered or upon completion of services. Financial planning and estate services typically have performance obligations that are greater than 12 months, although the amount of future performance obligations are not significant.

Capital markets and foreign exchange

Capital markets and foreign exchange fees primarily consist of mutual fund distribution fees, municipal advisory services, and foreign exchange services provided to customers. Revenue is recognized as the services are rendered or upon completion of services.

Other noninterest income from contracts with customers

Other noninterest income from customers primarily consists of trust operations outsourcing and other various income streams. Revenue is recognized as the services are rendered or upon completion of services.

Disaggregation of Revenue

We provide services across different geographical areas, primarily in 11 Western U.S. States, under banking operations that have their own individual brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. The operating segment listed as “Other” includes Zions Management Services Company, certain nonbank financial services subsidiaries, centralized back-office functions, and eliminations of transactions between the segments.

The following schedule sets forth the noninterest income and net revenue by operating segments for the three months endedSeptember 30, 2018 and 2017:

	Zions Bank				Amegy						CB&T
(In millions)	2018		2017		2018			2017			2018		2017
Service charges and fees on deposit accounts	$	14	$	16	$	11		$	9		$	7	$	7
Other service charges, commissions, and fees	19		18		9			9			6		6
Wealth management and trust income	4		4		3			2			1		1
Capital markets and foreign exchange	1		1		(1		)	(1		)	1		1
Total noninterest income from contracts with customers (ASC 606)	38		39		22			19			15		15
Other noninterest income (Non-ASC 606 customer related)	—		—		9			9			4		4
Total customer-related fees	38		39		31			28			19		19
Other noninterest income (non-customer related)	—		—		—			—			—		1
Total non-interest income	38		39		31			28			19		20
Other real estate owned gain from sale	—		—		—			—			—		1
Net interest income	177		165		133			122			138		120
Total income less interest expense	$	215	$	204	$	164		$	150		$	157	$	141

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	NBAZ				NSB				Vectra
(In millions)	2018		2017		2018		2017		2018		2017
Service charges and fees on deposit accounts	$	3	$	3	$	4	$	4	$	2	$	2
Other service charges, commissions, and fees	3		4		3		3		2		3
Wealth management and trust income	—		—		1		1		—		—
Capital markets and foreign exchange	—		—		—		—		—		—
Total noninterest income from contracts with customers (ASC 606)	6		7		8		8		4		5
Other noninterest income (Non-ASC 606 customer related)	3		2		2		2		2		2
Total customer-related fees	9		9		10		10		6		7
Other noninterest income (non-customer related)	1		1		—		1		—		—
Total non-interest income	10		10		10		11		6		7
Other real estate owned gain from sale	—		—		—		—		—		—
Net interest income	59		53		38		33		35		32
Total income less interest expense	$	69	$	63	$	48	$	44	$	41	$	39

	TCBW				Other						Consolidated Bank
(In millions)	2018		2017		2018			2017			2018		2017
Service charges and fees on deposit accounts	$	—	$	—	$	1		$	1		$	42	$	42
Other service charges, commissions, and fees	1		1		4			—			47		44
Wealth management and trust income	—		—		3			3			12		11
Capital markets and foreign exchange	—		—		2			2			3		3
Total noninterest income from contracts with customers (ASC 606)	1		1		10			6			104		100
Other noninterest income (Non-ASC 606 customer related)	—		—		1			3			21		22
Total customer-related fees	1		1		11			9			125		122
Other noninterest income (non-customer related)	—		—		10			14			11		17
Total non-interest income	1		1		21			23			136		139
Other real estate owned gain from sale	—		—		—			—			—		1
Net interest income	14		12		(29		)	(15		)	565		522
Total income less interest expense	$	15	$	13	$	(8	)	$	8		$	701	$	662

The following schedule sets forth the noninterest income and net revenue by operating segments for the nine months endedSeptember 30, 2018 and 2017:

	Zions Bank						Amegy						CB&T
(In millions)	2018			2017			2018			2017			2018		2017
Service charges and fees on deposit accounts	$	43		$	47		$	33		$	31		$	21	$	21
Other service charges, commissions, and fees	54			53			28			28			18		18
Wealth management and trust income	11			11			8			6			3		2
Capital markets and foreign exchange	4			3			(4		)	(4		)	3		3
Total noninterest income from contracts with customers (ASC 606)	112			114			65			61			45		44
Other noninterest income (Non-ASC 606 customer related)	(2		)	(1		)	30			27			12		11
Total customer-related fees	110			113			95			88			57		55
Other noninterest income (non-customer related)	1			(1		)	—			(1		)	2		1
Total non-interest income	111			112			95			87			59		56
Other real estate owned gain from sale	—			—			—			—			—		1
Net interest income	516			475			385			360			399		355
Total income less interest expense	$	627		$	587		$	480		$	447		$	458	$	412

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	NBAZ				NSB				Vectra
(In millions)	2018		2017		2018		2017		2018		2017
Service charges and fees on deposit accounts	$	9	$	10	$	10	$	11	$	7	$	6
Other service charges, commissions, and fees	9		9		9		9		5		5
Wealth management and trust income	1		1		3		2		1		1
Capital markets and foreign exchange	—		—		1		—		—		1
Total noninterest income from contracts with customers (ASC 606)	19		20		23		22		13		13
Other noninterest income (Non-ASC 606 customer related)	7		7		7		7		5		5
Total customer-related fees	26		27		30		29		18		18
Other noninterest income (non-customer related)	3		2		—		1		—		1
Total non-interest income	29		29		30		30		18		19
Other real estate owned gain from sale	—		—		—		—		—		—
Net interest income	170		152		111		96		101		94
Total income less interest expense	$	199	$	181	$	141	$	126	$	119	$	113

	TCBW				Other						Consolidated Bank
(In millions)	2018		2017		2018			2017			2018		2017
Service charges and fees on deposit accounts	$	1	$	1	$	1		$	—		$	125	$	127
Other service charges, commissions, and fees	2		2		11			6			136		130
Wealth management and trust income	—		—		11			7			38		30
Capital markets and foreign exchange	—		—		4			4			8		7
Total noninterest income from contracts with customers (ASC 606)	3		3		27			17			307		294
Other noninterest income (Non-ASC 606 customer related)	1		—		5			7			65		63
Total customer-related fees	4		3		32			24			372		357
Other noninterest income (non-customer related)	—		—		34			44			40		47
Total non-interest income	4		3		66			68			412		404
Other real estate owned gain from sale	—		—		1			1			1		2
Net interest income	38		34		(66		)	(27		)	1,654		1,539
Total income less interest expense	$	42	$	37	$	1		$	42		$	2,067	$	1,945

Revenue from contracts with customers did not generate significant contract assets and liabilities. Contract receivables are included in Other Assets. Payment terms vary by services offered, and the timing between completion of performance obligations and payment is typically not significant.

11. RETIREMENT PLANS

The following discloses the net periodic benefit cost (credit) and its components for the Bank’s pension and other retirement plans:

(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Interest cost	$	1		$	2		$	4		$	5
Expected return on plan assets	(3		)	(3		)	(9		)	(9		)
Partial settlement loss	1			1			2			2
Amortization of net actuarial loss	—			1			1			4
Net periodic benefit cost (benefit)	$	(1	)	$	1		$	(2	)	$	2

As disclosed in our 2017 Annual Report on Form 10-K, the Bank has frozen its participation and benefit accruals for the pension plan and its contributions for individual benefit payments in the postretirement benefit plan. In October 2018, the Bank has decided to terminate its pension plan subject to obtaining necessary regulatory

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approval. Completion of this termination is expected in early 2020. Plan participant benefits will not be disadvantaged because of this decision.

12. INCOME TAXES

The effective income tax rate of 23.6% for the third quarter of 2018 was lower than the 2017third quarter rate of 34.2%. The effective tax rates for the first nine months of 2018 and 2017 were 22.9% and 30.6%, respectively. The tax rates for 2018 and 2017 were reduced by nontaxable municipal interest income and nontaxable income from certain bank-owned life insurance. The income tax rate for 2018 was positively impacted by the decrease in the corporate federal income tax rate to 21% from 35% due to the Tax Cuts and Jobs Act, which was effective January 1, 2018. This rate benefit was partially reduced by the non-deductibility of Federal Deposit Insurance Corporation (“FDIC”) premiums, certain executive compensation and other fringe benefits as enacted by the new tax law. The tax rate for 2017 was also impacted by a one-time $14 million benefit to tax expense related to state tax adjustments and a one-time $4 million benefit due to changes in the carrying value of various state deferred tax items.

We had a net deferred tax asset (“DTA”) balance of $170 million at September 30, 2018, compared with $93 million at December 31, 2017. The increase in the net DTA resulted primarily from the increase of accrued compensation and unrealized losses in OCI related to securities, and the decrease in deferred tax liabilities related to the deferred gain on a prior period debt exchange. Net charge-offs exceeding the provision for loan losses and an increase in deferred loan fees offset some of the overall increase in DTA.

13. NET EARNINGS PER COMMON SHARE

Basic and diluted net earnings per common share based on the weighted average outstanding shares are summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except shares and per share amounts)	2018		2017		2018		2017
Basic:
Net income	$	223	$	160	$	658	$	469
Less common and preferred dividends	66		32		170		89
Undistributed earnings	157		128		488		380
Less undistributed earnings applicable to nonvested shares	1		1		4		4
Undistributed earnings applicable to common shares	156		127		484		376
Distributed earnings applicable to common shares	58		24		144		56
Total earnings applicable to common shares	$	214	$	151	$	628	$	432
Weighted average common shares outstanding (in thousands)	192,973		200,332		195,079		201,493
Net earnings per common share	$	1.11	$	0.75	$	3.22	$	2.14
Diluted:
Total earnings applicable to common shares	$	214	$	151	$	628	$	432
Weighted average common shares outstanding (in thousands)	192,973		200,332		195,079		201,493
Dilutive effect of common stock warrants (in thousands)	11,880		7,729		12,555		6,783
Dilutive effect of stock options (in thousands)	912		1,045		1,023		1,090
Weighted average diluted common shares outstanding (in thousands)	205,765		209,106		208,657		209,366
Net earnings per common share	$	1.04	$	0.72	$	3.01	$	2.06

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The following schedule presents the weighted average shares of stock awards that were anti-dilutive and not included in the calculation of diluted earnings per share.

	Three Months Ended September 30,		Nine Months Ended September 30,
(In thousands)	2018	2017	2018	2017
Restricted stock and restricted stock units	1,490	1,779	1,651	1,997

14. OPERATING SEGMENT INFORMATION

We manage our operations and prepare management reports and other information with a primary focus on geographical area. Our banking operations are managed under their own individual brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. Performance assessment and resource allocation are based upon this geographical structure. We use an internal funds transfer pricing (“FTP”) allocation system to report results of operations for business segments. This process continues to be refined. Prior period amounts have been reclassified to reflect these changes. Total average loans and deposits presented for the banking segments do not include intercompany amounts between banking segments, but may include deposits with the Other segment.

As of September 30, 2018, our banking business is conducted through 7 locally managed and branded segments in distinct geographical areas. Zions Bank operates 97 branches in Utah, 23 branches in Idaho, and one branch in Wyoming. Amegy operates 73 branches in Texas. CB&T operates 90 branches in California. NBAZ operates 58 branches in Arizona. NSB operates 50 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates one branch in Washington and one branch in Oregon.

The operating segment identified as “Other” includes certain nonbank financial service subsidiaries, centralized back-office functions, and eliminations of transactions between segments. The major components of net interest income at the Bank’s back-office include the revenue associated with the investments securities portfolio and the offset of the FTP costs and benefits provided to the business segments.

The following schedule does not present total assets or income tax expense for each operating segment, but instead presents average loans, average deposits and income before income taxes because these are the metrics that management uses when evaluating performance and making decisions pertaining to the operating segments. The Bank’s net interest income includes interest expense on borrowed funds. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment.

The accounting policies of the individual operating segments are the same as those of the Bank. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

The following schedule presents selected operating segment information for the three months ended September 30, 2018 and 2017:

(In millions)	Zions Bank					Amegy					CB&T
	2018		2017			2018			2017		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	177	$	165		$	133		$	122	$	138	$	120
Provision for loan losses	2		(15		)	(16		)	33		3		(4		)
Net interest income after provision for loan losses	175		180			149			89		135		124
Noninterest income	38		39			31			28		19		20
Noninterest expense	118		107			84			86		77		74
Income (loss) before income taxes	$	95	$	112		$	96		$	31	$	77	$	70
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	12,607	$	12,543		$	11,328		$	11,170	$	9,985	$	9,575
Total average deposits	15,845		15,773			11,185			10,862		11,335		11,021

(In millions)	NBAZ						NSB					Vectra
	2018			2017			2018		2017			2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	59		$	53		$	38	$	33		$	35	$	32
Provision for loan losses	(1		)	(8		)	—		(3		)	1		—
Net interest income after provision for loan losses	60			61			38		36			34		32
Noninterest income	10			10			10		11			6		7
Noninterest expense	39			38			35		35			26		25
Income (loss) before income taxes	$	31		$	33		$	13	$	12		$	14	$	14
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	4,591		$	4,267		$	2,408	$	2,347		$	2,969	$	2,683
Total average deposits	5,008			4,816			4,302		4,276			2,789		2,757

(In millions)	TCBW				Other						Consolidated Bank
	2018		2017		2018			2017			2018			2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	14	$	12	$	(29	)	$	(15	)	$	565		$	522
Provision for loan losses	—		3		—			(1		)	(11		)	5
Net interest income after provision for loan losses	14		9		(29		)	(14		)	576			517
Noninterest income	1		1		21			23			136			139
Noninterest expense	6		5		35			43			420			413
Income (loss) before income taxes	$	9	$	5	$	(43	)	$	(34	)	$	292		$	243
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	1,136	$	939	$	344		$	308		$	45,368		$	43,832
Total average deposits	1,086		1,098		2,025			1,318			53,575			51,921

76

ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

The following schedule presents selected operating segment information for the nine months ended September 30, 2018 and 2017:

(In millions)	Zions Bank				Amegy					CB&T
	2018		2017		2018			2017		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	516	$	475	$	385		$	360	$	399	$	355
Provision for loan losses	3		18		(72		)	41		7		(10		)
Net interest income after provision for loan losses	513		457		457			319		392		365
Noninterest income	111		112		95			87		59		56
Noninterest expense	350		327		254			259		231		225
Income (loss) before income taxes	$	274	$	242	$	298		$	147	$	220	$	196
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	12,565	$	12,505	$	11,362		$	10,890	$	9,941	$	9,453
Total average deposits	15,847		16,001		11,022			11,131		11,213		10,953

(In millions)	NBAZ					NSB					Vectra
	2018		2017			2018		2017			2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	170	$	152		$	111	$	96		$	101	$	94
Provision for loan losses	8		(7		)	—		(8		)	5		—
Net interest income after provision for loan losses	162		159			111		104			96		94
Noninterest income	29		29			30		30			18		19
Noninterest expense	115		111			108		105			79		75
Income (loss) before income taxes	$	76	$	77		$	33	$	29		$	35	$	38
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	4,591	$	4,258		$	2,369	$	2,352		$	2,882	$	2,607
Total average deposits	4,912		4,747			4,280		4,240			2,762		2,758

(In millions)	TCBW				Other						Consolidated Bank
	2018		2017		2018			2017			2018			2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	38	$	34	$	(66	)	$	(27	)	$	1,654		$	1,539
Provision for loan losses	2		2		1			(1		)	(46		)	35
Net interest income after provision for loan losses	36		32		(67		)	(26		)	1,700			1,504
Noninterest income	4		3		66			68			412			404
Noninterest expense	16		16		106			114			1,259			1,232
Income (loss) before income taxes	$	24	$	19	$	(107	)	$	(72	)	$	853		$	676
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	1,113	$	909	$	336		$	244		$	45,159		$	43,218
Total average deposits	1,069		1,098		1,722			1,227			52,827			52,155

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest rate and market risks are among the most significant risks regularly undertaken by us, and they are closely monitored as previously discussed. A discussion regarding our management of interest rate and market risk is included in the section entitled “Interest Rate and Market Risk Management” in this Form 10-Q.

ITEM 4. CONTROLS AND PROCEDURES

The Bank’s management, with the participation of the Bank’s Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the Bank’s disclosure controls and procedures as of September 30, 2018. Based on that evaluation, the Bank’s Chief Executive Officer and Chief Financial Officer concluded that the Bank’s disclosure controls and procedures were effective as of September 30, 2018. There were no changes in the Bank’s

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

internal control over financial reporting during the third quarter of 2018 that have materially affected, or are reasonably likely to materially affect, the Bank’s internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

The information contained in Note 9 of the Notes to Consolidated Financial Statements is incorporated by reference herein.

ITEM 1A. RISK FACTORS

We believe there have been no material changes in the risk factors included in Zions Bancorporation, National Association’s 2017 Annual Report on Form 10-K.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following schedule summarizes the Bank’s share repurchases for the third quarter of 2018:

SHARE REPURCHASES

Period	Total number of shares repurchased 1		Average price paid per share		Total number of shares purchased as part of publicly announced plans or programs		Approximate dollar value of shares that may yet be  purchased under the plan
July		1,001,554	$	51.93		1,000,000		$	133,072,690
August		2,506,052	53.23			2,500,120		325
September		855	53.05					325
Third quarter		3,508,461	52.86			3,500,120

¹  Represents common shares acquired from employees in connection with our stock compensation plan in addition to shares acquired under previously reported share repurchase plans. Shares were acquired from employees to pay for their payroll taxes and stock option exercise cost upon the vesting of restricted stock and restricted stock units, and the exercise of stock options, under provisions of an employee share-based compensation plan.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

ITEM 6. EXHIBITS

a)Exhibits

Exhibit Number	Description
2.1	Amended and Restated Agreement and Plan of Merger, dated as of July 10, 2018, by and between Zions Bancorporation and ZB, National Association, incorporated by reference to Exhibit 2.1 of Form 8-K filed on October 2, 2018.	*
3.1	Second Amended and Restated Articles of Association of Zions Bancorporation, National Association, incorporated by reference to Exhibit 3.1 of Form 8-K filed on October 2, 2018.	*
3.2	Amended and Restated Bylaws of Zions Bancorporation, National Association, incorporated by reference to Exhibit 3.2 of Form 8-K filed on October 2, 2018.	*
4.1	Second Supplemental Indenture, dated as of September 30, 2018, by and among The Bank of New York Mellon Trust Company, N.A., as Trustee, ZB, National Association and Zions Bancorporation, incorporated by reference to Exhibit 4.1 of Form 8-K filed on October 2, 2018.	*
4.2	Fourth Supplemental Indenture, dated as of September 30, 2018, by and among The Bank of New York Mellon Trust Company, N.A., as Trustee, ZB, National Association and Zions Bancorporation, incorporated by reference to Exhibit 4.2 of Form 8-K filed on October 2, 2018.	*
4.3	First Amendment to Warrant Agreement, dated as of September 30, 2018, by and between Zions Bancorporation and ZB, National Association (filed herewith).
10.1	Third Amendment to the Zions Bancorporation Pension Plan, dated October 30, 2017 (filed herewith).
10.2	Seventh Amendment to the Trust Agreement between Fidelity Management Trust Company and Zions Bancorporation for the Deferred Compensation Plans, effective September 30, 2018 (filed herewith).
10.3	Eighth Amendment to the Trust Agreement between Fidelity Management Trust Company and Zions Bancorporation for the Payshelter 401(k) and Employee Stock Ownership Plan, effective September 30, 2018 (filed herewith).
31.1	Certification by Chief Executive Officer required by Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934 (filed herewith).
31.2	Certification by Chief Financial Officer required by Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934 (filed herewith).
32	Certification by Chief Executive Officer and Chief Financial Officer required by Sections 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934 (15 U.S.C. 78m) and 18 U.S.C. Section 1350 (furnished herewith).
101	Interactive data files pursuant to Rule 405 of Regulation S-T: (i) the Consolidated Balance Sheets as of September 30, 2018 and December 31, 2017, (ii) the Consolidated Statements of Income for the three months ended September 30, 2018 and September 30, 2017 and the nine months ended September 30, 2018 and September 30, 2017, (iii) the Consolidated Statements of Comprehensive Income for the three months ended September 30, 2018 and September 30, 2017 and the nine months ended September 30, 2018 and September 30, 2017, (iv) the Consolidated Statements of Changes in Shareholders’ Equity for the nine months ended September 30, 2018 and September 30, 2017, (v) the Consolidated Statements of Cash Flows for the three months ended September 30, 2018 and September 30, 2017 and the nine months ended September 30, 2018 and September 30, 2017 and (vi) the Notes to Consolidated Financial Statements (filed herewith).

* Incorporated by reference

Pursuant to Item 601(b)(4)(iii)(A) of Regulation S-K, copies of certain instruments defining the rights of holders of long-term debt are not filed. The Bank agrees to furnish a copy thereof to the Securities and Exchange Commission and the Office of the Comptroller of the Currency upon request.

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ZIONS BANCORPORATION, NATIONAL ASSOCIATION AND SUBSIDIARIES

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

ZIONS BANCORPORATION, NATIONAL ASSOCIATION

/s/ Harris H. Simmons

Harris H. Simmons, Chairman and

Chief Executive Officer

/s/ Paul E. Burdiss

Paul E. Burdiss, Executive Vice President and Chief Financial Officer

Date: November 7, 2018

80

EX-4.3

EXHIBIT 4.3

AMENDMENT NO. 1 TO WARRANT AGREEMENT

THIS AMENDMENT NO. 1 TO WARRANT AGREEMENT, dated as of September 30, 2018 (this “Amendment”), by and between Zions Bancorporation, a Utah corporation (the “Company”), and ZB, National Association (formerly Zions First National Bank), a national banking association organized under the laws of the United States (the “Warrant Agent”). Defined terms used herein and not otherwise defined shall have the meanings given to them in the Warrant Agreement;

WHEREAS, the Company and the Warrant Agent have previously entered into that certain Warrant Agreement, dated as of May 25, 2010 (the “Warrant Agreement”);

WHEREAS, the Company has entered into that certain Agreement and Plan of Merger (as the same may be amended, modified or supplemented from time to time, the “Merger Agreement”), amended and restated on July 10, 2018, with the Warrant Agent, pursuant to which Company will merge with and into the Warrant Agent (the “Merger”), with the Warrant Agent surviving the Merger (the “Surviving Entity”);

WHEREAS, the Merger is a Reorganization Event in accordance with Section 6.07(a) of the Warrant Agreement and in connection with the Merger Agreement the parties desire to amend the Warrant Agreement in accordance with Sections 6.07(d) and 7.03 as set forth herein; and

WHEREAS, ZB, National Association, as successor to the Company in the Merger, desires to assume all the Company’s obligations under this Warrant Agreement and the Warrant.

NOW, THEREFORE, in consideration of the premises set forth herein and the agreements contained herein, and intending to be legally bound hereby, the parties hereto agree as follows:

Section 1.Reorganization Event.

(a)Pursuant to Section 6.07(a) of the Warrant Agreement, following the effective time of the Merger, each Warrant to purchase one share of common stock of the Company shall be exercisable for the right to purchase one share of common stock of the Surviving Entity.

(b)Pursuant to Section 6.08 of the Warrant Agreement, ZB, National Association, as successor to the Company in the Merger, hereby expressly assumes all the Company’s obligations under the Warrant Agreement and the Warrants.

Section 2. Miscellaneous Provisions

(a)No Other Amendments; Confirmation. Except as expressly amended by this Amendment, the provisions of the Warrant Agreement are and shall remain in full force and effect, without any waiver, amendment or modification of any provision thereof.

(b)No Third Party Beneficiaries. Nothing in this Amendment expressed and nothing that may be implied from any of the provisions hereof is intended, or shall be construed, to confer upon, or give to, any Person other than the parties hereto and the Warrant holders any right, remedy or claim under or by reason of this Amendment or of any covenant, condition, stipulation, promise or agreement hereof, and all covenants, conditions, stipulations, promises and agreements contained in this Amendment shall be for the sole and exclusive benefit of the parties hereto and their successors and the Warrant holders.

(c)Governing Law. This Amendment shall be governed by and interpreted in accordance with the laws of the State of New York without giving effect to the principles of conflicts of laws thereof.

(d)Counterparts. This Amendment may be executed in one or more counterparts, each of which shall be deemed an original but all of which shall constitute one and the same instrument, and a facsimile or portable document format (pdf) document shall be deemed to be an original signature for all purposes under this Amendment.

(e)Entire Agreement. The Warrant Agreement, as amended hereby, represents the entire understanding of the parties hereto with reference to the matters set forth herein. The Warrant Agreement, as amended hereby, supersedes all prior negotiations, discussions, correspondence, communications and prior agreements among the parties hereto relating to the subject matter herein.

[Signature Page Follows.]

IN WITNESS WHEREOF, the undersigned have caused this Amendment to be duly executed as of the date first indicated above.

ZIONS BANCORPORATION

By: /s/ Harris H. Simmons    Name:    Harris H. Simmons
Title:    Chairman and CEO

ZB, NATIONAL ASSOCIATION, as Warrant Agent

By: /s/ Paul E. Burdiss    Name:    Paul E. Burdiss
Title:    Executive Vice President

ZB, NATIONAL ASSOCIATION, as successor

By: /s/ Paul E. Burdiss    Name:    Paul E. Burdiss
Title:    Executive Vice President

EX-10.1

EXHIBIT 10.1

THIRD AMENDMENT TO THE

ZIONS BANCORPORATION PENSION PLAN

(December 31, 2010 Edition)

This Third Amendment to the Zions Bancorporation Pension Plan is made and entered into this 30 day of October, 2017, by the Zions Bancorporation Benefits Committee (“Committee”) on behalf of Zions Bancorporation, hereinafter referred to as the “Employer.”

WHEREAS, the Employer previously established and continues to maintain a pension plan for certain employees of the Company and certain of its affiliates called the of Zions Bancorporation Pension Plan (hereinafter referred to as the “Plan”); and

WHEREAS, the Employer has most recently amended and restated the Plan as the December 31, 2010 Edition of the Plan; and

WHEREAS, pursuant to Section 13.1(a) of the Plan the Employer has reserved the right to amend the Plan in whole or in part, which authority for purposes of this amendment has been delegated to the Committee; and

WHEREAS, the Committee has most recently amended the Plan effective July 1, 2017, (“Second Amendment”) by adding a new Section 5.17 thereto for the purpose of offering to certain deferred vested participants and certain beneficiaries of deceased participants a temporary election to receive an immediate distribution from the Plan; and

WHEREAS, the Second Amendment provides in part for a temporary election window period during which eligible terminated participants may choose to take a single sum payment from the Plan, which window is scheduled to close on November 1, 2017; and

WHEREAS, the Committee has determined that it is in best interests of the eligible terminated participants and good Plan administration to extend the close of the temporary election window period from November 1, 2017, until Friday, November 24, 2017;

NOW THEREFORE, the Committee, for and on behalf of the Employer, and in exercise of the authority granted to it, hereby adopts the following amendment to the Plan.

1.    Effective July 1, 2017, Section 5.17 is amended to read as follows (amended language is in bold italics):

5.17 Temporary Election Window for Immediate Distribution of Accrued Benefit. An Eligible Terminated Participant who satisfies the requirements of this Section and who so elects during the Temporary Election Window, shall be entitled to receive an immediate distribution of the Eligible Terminated Participant’s Accrued Benefit according to the provisions of this Section.

(a) During the temporary election window period (“Election Window”), an Eligible Terminated Participant may elect to receive payment of the Accrued Benefit (pension) to which the Eligible Terminated Participant is entitled under the Plan. The benefit payment shall be made in the form of a single sum payment, subject to the right of the Eligible Terminated Participant to elect receipt of the accrued benefit instead in the form of an annuity as described in subsection (c).

(b) The amount of the single sum payment (or present value of the annuity payments, if elected) will be calculated using the Applicable Mortality Table and Applicable Interest Rate as defined in subsections (a) and (b) of Appendix II of the Plan, respectively. The amount so determined will be adjusted, as appropriate, for early commencement by using the applicable interest rate and applicable mortality table required by Code §417(e)(3) for the 2017 Plan Year. The calculation shall be determined as of November 1, 2017, and the benefit shall be paid commencing in the month of November, 2017, or as soon thereafter as is administratively practicable. The determination of the single sum amount shall not take into account any early retirement subsidy otherwise payable.

(c) If an Eligible Terminated Participant qualifies to receive the single sum payment as provided in this Section, he or she may, in lieu of the single sum payment, elect to receive distribution in the form of a single life annuity for the life of the Eligible Terminated Participant or, if the Eligible Terminated Participant is married on the date the Election Window starts, in the form of a joint and survivor annuity with either a 50% or 75% survivor benefit to the Eligible Terminated Participant’s surviving spouse. No other benefit distribution options shall be available to an Eligible Terminated Participant under this Election Window. An Eligible Terminated Participant who is married at the start of the Election Window must obtain spousal consent to elect a form of benefit other than the available joint and survivor annuity (for which spousal consent is not required) in accordance with the Plan's normal rules.

(d) For purposes of this Section, the following terms shall be defined as set forth below:

(1) “Eligible Terminated Participant” means a Participant whose Termination of Employment occurred any time prior to July 1, 2017, and who has not yet commenced receiving payment of his or her benefit, even if the Participant has not yet otherwise met any other conditions required by the Plan to commence payment, but in all events excluding any Participant whose date of Termination of Employment is on or after July 1, 2017, or who attains his or her Normal Retirement Date or Early Retirement Date prior to November 1, 2017, whether or not he or she has commenced receiving distribution of his or her Accrued Benefit.

(2) "Election Window" shall mean the period beginning on August 1, 2017, and ending on November 24, 2017. All forms necessary and required to be signed and submitted in order to elect the benefit provided under this Election Window must be postmarked no later than November 24, 2017, to be considered timely, or if electronic submission is available, delivered no later than midnight, Mountain Time on November 24, 2017. No one may elect a single sum payment or any early commencement of payment or distribution not otherwise authorized under the terms of the Plan after the close of the Election Window.

(3) An alternate payee entitled to a separate interest in a Participant's accrued benefit under a qualified domestic relations order shall be treated as an Eligible Terminated Participant if the QDRO has been approved no later than October 1, 2017, but only if the terms of the QDRO accommodate participation by the alternate payee in the Election Window (even if the alternate payee would not otherwise be eligible for payment, so long as the order does not prohibit early payment).

IN WITNESS WHEREOF, the Committee has caused this Third Amendment to be executed by its duly authorized representative this __30__ day of October, 2017.

ZIONS BANCORPORATION BENEFITS COMMITTEE

By: /s/ Paul E. Burdiss_________________________

Committee Chair

1

EX-10.2

EXHIBIT 10.2

SEVENTH AMENDMENT TO TRUST AGREEMENT BETWEEN

FIDELITY MANAGEMENT TRUST COMPANY AND

ZIONS BANCORPORATION

THIS SEVENTH AMENDMENT, effective as of September 30, 2018, unless otherwise stated herein, by and between Fidelity Management Trust Company (the “Trustee”) and Zions Bancorporation, N.A. (the “Sponsor”);

WITNESSETH:

WHEREAS, the Trustee and the Sponsor heretofore entered into a Master Trust Agreement dated September 1, 2006 (the “Agreement”), with regard to the Zions Bancorporation Restated Deferred Compensation Plan, the Zions Bancorporation Restated Deferred Compensation Plan for Directors, and the Restated Amegy Bancorporation, Inc. Non-Employees Directors Deferred Fee Plan (collectively and individually, the “Plan”); and

WHEREAS, the Sponsor has informed the Trustee that effective September 30, 2018, “Zions Bancorporation” has merged into its subsidiary, ZB, N.A., creating “Zions Bancorporation, N.A.”, and all references thereto should be changed accordingly; and

WHEREAS, the Trustee and the Sponsor now desire to amend the Agreement as provided for in Section 14thereof;

NOW THEREFORE, in consideration of the above premises, the Trustee and the Sponsor hereby amend the Agreement by:

(1) Replacing all references to “Zions Bancorporation” with “Zions Bancorporation, N.A.”.

(2) Replacing all references to “Zions Bancorporation Restated Deferred Compensation Plan” with “Zions Bancorporation, N.A. Restated Deferred Compensation Plan”, and replacing all references to “Zions Bancorporation Restated Deferred Compensation Plan for Directors” with “Zions Bancorporation, N.A. Restated Deferred Compensation Plan for Directors”.

(3) Replacing all references to “Zions Bancorporation Deferred Compensation Plans Master Trust” with “Zions Bancorporation, N.A. Deferred Compensation Plans Master Trust”.

(4) Restating Section 1(y), “Plan”, in its entirety, as follows:

(y)    “Plan”

“Plan” shall mean, collectively and individually, the Zions Bancorporation, N.A. Restated Deferred Compensation Plan, the Zions Bancorporation, N.A. Restated Deferred Compensation Plan for Directors, and the Restated Amegy Bancorporation, Inc. Non-Employees Directors Deferred Fee Plan.

(5) Restating Section 1(dd), “Sponsor”, in its entirety, as follows:

(dd)    “Sponsor”

"Sponsor" shall mean Zions Bancorporation, N.A., a Utah corporation, or any successor to all or substantially all of its businesses which, by agreement, operation of law or otherwise, assumes the responsibility of the Sponsor under this Agreement.

(6) Restating Section 1(ee), “Trust”, in its entirety, as follows:

(ee)    “Trust”

"Trust" shall mean the Zions Bancorporation, N.A. Deferred Compensation Plans Master Trust, being the trust established by the Sponsor and the Trustee pursuant to the provisions of this Agreement.

IN WITNESS WHEREOF, the Trustee and the Sponsor have caused this Seventh Amendment to be executed by their duly authorized officers effective as of the day and year first above written. By signing below, the undersigned represent that they are authorized to execute this document on behalf of the respective parties. Notwithstanding any contradictory provision of the agreement that this document amends, each party may rely without duty of inquiry on the foregoing representation.

ZIONS BANCORPORATION, N.A. FIDELITY MANAGEMENT TRUST COMPANY

By: /s/ Diana M. Andersen_________10/15/18    By: /s/ Bob Salerno___________________10/15/18

Authorized Signatory Date        FMTC Authorized Signatory Date

1    

EX-10.3

EXHIBIT 10.3

EIGHTH AMENDMENT TO TRUST AGREEMENT BETWEEN

FIDELITY MANAGEMENT TRUST COMPANY AND

ZIONS BANCORPORATION

THIS EIGHTH AMENDMENT, effective as of September 30, 2018, unless otherwise stated herein, by and between Fidelity Management Trust Company (the “Trustee”) and Zions Bancorporation, N.A. (the “Sponsor”);

WITNESSETH:

WHEREAS, the Trustee and the Sponsor heretofore entered into a Trust Agreement dated July 3, 2006 (the “Agreement”), with regard to the Zions Bancorporation Payshelter 401(k) and Employee Stock Ownership Plan (the “Plan”); and

WHEREAS, the Sponsor has informed the Trustee that effective September 30, 2018, “Zions Bancorporation” has merged into its subsidiary, ZB, N.A., creating “Zions Bancorporation, N.A.”, and all references thereto should be changed accordingly; and

WHEREAS, the Trustee and the Sponsor now desire to amend the Agreement as provided for in Section 13 thereof;

NOW THEREFORE, in consideration of the above premises, the Trustee and the Sponsor hereby amend the Agreement by:

(1) Replacing all references to “Zions Bancorporation” with “Zions Bancorporation, N.A.”.

(2) Replacing all references to “Zions Bancorporation Payshelter 401(k) and Employee Stock Ownership Plan” with “Zions Bancorporation, N.A. Payshelter 401(k) and Employee Stock Ownership Plan”.

(3) Replacing all references to “Zions Bancorporation Payshelter 401(k) and Employee Stock Ownership Plan Trust” with “Zions Bancorporation, N.A. Payshelter 401(k) and Employee Stock Ownership Plan Trust”.

(4) Restating Section 1(bb), “Plan”, in its entirety, as follows:

(bb)    “Plan”

“Plan” shall mean Zions Bancorporation, N.A. Payshelter 401(k) and Employee Stock Ownership Plan.

(5) Restating Section 1(hh), “Sponsor”, in its entirety, as follows:

(hh)    “Sponsor”

"Sponsor" shall mean Zions Bancorporation, N.A., a Utah corporation, or any successor to all or substantially all of its businesses which, by agreement, operation of law or otherwise, assumes the responsibility of the Sponsor under this Agreement.

(6) Restating Section 1(kk), “Trust”, in its entirety, as follows:

(kk)    “Trust”

"Trust" shall mean the Zions Bancorporation, N.A. Payshelter 401(k) and Employee Stock Ownership Plan Trust, being the trust established by the Sponsor and the Trustee pursuant to the provisions of this Agreement.

IN WITNESS WHEREOF, the Trustee and the Sponsor have caused this Eighth Amendment to be executed by their duly authorized officers effective as of the day and year first above written.By signing below, the undersigned represent that they are authorized to execute this document on behalf of the respective parties. Notwithstanding any contradictory provision of the agreement that this document amends, each party may rely without duty of inquiry on the foregoing representation.

ZIONS BANCORPORATION, N.A. FIDELITY MANAGEMENT TRUST

COMPANY

By: /s/ Diana M. Andersen___________10/15/18     By: /s/ Bob Salerno__________________10/15/18

Authorized Signatory Date        FMTC Authorized Signatory Date

1    

EX-31.1

EXHIBIT 31.1

CERTIFICATION

Principal Executive Officer

I, Harris H. Simmons, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Zions Bancorporation, National Association;

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 registrant as of, and for, the periods presented in this report;

4. The registrant’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 registrant 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 registrant, 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 registrant’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 registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’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 registrant’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 registrant’s internal control over financial reporting.

Date: November 7, 2018

/s/ Harris H. Simmons

Harris H. Simmons, Chairman and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION

Principal Financial Officer

I, Paul E. Burdiss, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Zions Bancorporation, National Association;

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 registrant as of, and for, the periods presented in this report;

4. The registrant’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 registrant 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 registrant, 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 registrant’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 registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’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 registrant’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 registrant’s internal control over financial reporting.

Date: November 7, 2018

/s/ Paul E. Burdiss

Paul E. Burdiss, Executive Vice President and Chief Financial Officer

EX-32

EXHIBIT 32

CERTIFICATION

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. §1350, the undersigned officers of Zions Bancorporation, National Association (the “Bank”) hereby certify that, to the best of their knowledge, the Bank’s Quarterly Report for the three months ended September 30, 2018 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934 (15 U.S.C. 78m) and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Bank.

Date: November 7, 2018

/s/ Harris H. Simmons
Name:	Harris H. Simmons
Title:	Chairman and Chief Executive Officer
/s/ Paul E. Burdiss
Name:	Paul E. Burdiss
Title:	Executive Vice President and Chief Financial Officer

The foregoing certification is being furnished solely pursuant to 18 U.S.C. §1350 and is not being filed as part of the Report or as a separate disclosure document.

XML

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	zion
Entity Registrant Name	ZIONS BANCORPORATION, NATIONAL ASSOCIATION /UT/
Entity Central Index Key	0000109380
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		192,185,109
Entity Emerging Growth Company	false
Entity Small Business	false

XML

Consolidated Balance Sheets - USD ($) shares in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 517,000,000	$ 548,000,000
Money market investments:
Interest-bearing deposits	590,000,000	782,000,000
Federal funds sold and security resell agreements	560,000,000	514,000,000
Investment securities:
Available-for-sale, at fair value	14,625,000,000	15,161,000,000
Trading account, at fair value	176,000,000	148,000,000
Total investment securities	15,552,000,000	16,079,000,000
Loans held for sale	61,000,000	44,000,000
Loans held for investment, net of allowance
Loans and leases, net of unearned income and fees	45,810,000,000	44,780,000,000
Less allowance for loan losses	480,000,000	518,000,000
Loans held for investment, net of allowance	45,330,000,000	44,262,000,000
Other noninterest-bearing investments	1,027,000,000	1,029,000,000
Premises, equipment and software, net	1,111,000,000	1,094,000,000
Goodwill and intangibles	1,015,000,000	1,016,000,000
Other real estate owned	4,000,000	4,000,000
Other assets	964,000,000	916,000,000
Total assets	66,731,000,000	66,288,000,000
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand	24,067,000,000	23,886,000,000
Interest-bearing:
Savings and money market	25,462,000,000	25,620,000,000
Total deposits	53,785,000,000	52,621,000,000
Federal funds purchased and other short-term borrowings	3,780,000,000	4,976,000,000
Long-term Debt	879,000,000	383,000,000
Reserve for unfunded lending commitments	58,000,000	58,000,000
Other liabilities	676,000,000	571,000,000
Total liabilities	59,178,000,000	58,609,000,000
Shareholders' equity:
Preferred stock, without par value	566,000,000	566,000,000
Common Stock	192,169	4,445,000,000
Additional Paid-in Capital	4,052,000,000	0
Retained earnings	3,296,000,000	2,807,000,000
Accumulated other comprehensive income (loss)	(361,000,000)	(139,000,000)
Stockholders' Equity	7,553,000,000	7,679,000,000
Total liabilities and shareholders' equity	$ 66,731,000,000	$ 66,288,000,000
Preferred Stock, Shares Authorized	4,400	4,400
Common Stock, Shares Authorized	350,000	350,000
Common Stock, Shares, Issued	192,169	197,532
Common Stock, Shares, Outstanding	192,169	197,532
Fair Value, Inputs, Level 2 [Member]
Investment securities:
Held-to-maturity, at amortized cost	$ 751,000,000	$ 770,000,000
Trading account, at fair value	57,000,000	148,000,000
Interest-bearing:
Time	4,256,000,000	3,115,000,000
Long-term Debt	$ 879,000,000	$ 383,000,000

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Preferred Stock, Shares Authorized	4,400	4,400
Common Stock, Shares Authorized	350,000	350,000
Common Stock, Par or Stated Value Per Share	$ 0.0010
Common Stock, Shares, Issued	192,169	197,532
Held-to-maturity, fair value	$ 734
Common stock, outstanding shares	192,169	197,532
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Held-to-maturity, fair value	$ 734	$ 762

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Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income:
Interest and Fees and Loans	$ 537	$ 468	$ 1,548	$ 1,370
Interest on Money Market Investments	8	5	20	14
Interest on Securities	86	84	257	246
Total Interest Income	631	557	1,825	1,630
Interest expense:
Interest on Deposits	38	15	87	43
Interest on short- and long-term borrowings	28	20	84	48
Total Interest Expense	66	35	171	91
Net interest income	565	522	1,654	1,539
Provision for loan losses	(11)	5	(46)	35
Net interest income after provision for loan losses	576	517	1,700	1,504
Noninterest income:
Service charges and fees on deposit accounts	42	42	125	127
Other service charges, commissions, and fees	59	55	168	160
Wealth management and trust income	12	11	38	30
Loan Sales and Servicing Income	5	6	18	19
Capital markets and foreign exchange	7	8	23	21
Customer-related Fees	125	122	372	357
Dividends and Other Investment Income	11	9	34	31
Securities Gains (Losses), Net	(1)	5	(1)	13
Other	1	3	7	3
Noninterest Income	136	139	412	404
Noninterest expense:
Salaries and Employee Benefits	264	251	800	753
Occupancy, Net	33	35	96	101
Furniture, Equipment, and Software, Net	30	32	95	96
Other real estate expense, net	(1)	1	(1)	1
Credit-Related Expense	5	7	19	23
Provision for unfunded lending commitments	0	(4)	0	(6)
Professional and Legal Fees	12	15	37	43
Advertising	8	6	20	17
FDIC Premiums	18	15	44	40
Other	49	57	147	166
Total Noninterest Expense	420	413	1,259	1,232
Income Before Income Taxes	292	243	853	676
Income taxes	69	83	195	207
Net income	223	160	658	469
Preferred Stock Dividends	(8)	(8)	(25)	(30)
Preferred Stock Redemption	0	0	0	(3)
Net Earnings Available to Common Shareholders	$ 215	$ 152	$ 633	$ 436
Weighted average common shares outstanding during the period:
Weighted Average Number of Shares Outstanding, Basic	192,973	200,332	195,079	201,493
Weighted Average Number of Shares Outstanding, Diluted	205,765	209,106	208,657	209,366
Earnings Per Share, Basic	$ 1.11	$ 0.75	$ 3.22	$ 2.14
Earnings Per Share, Diluted	$ 1.04	$ 0.72	$ 3.01	$ 2.06

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Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income for the period	$ 223	$ 160	$ 658	$ 469
Other comprehensive income (loss), net of tax:
Unrealized holding gains (losses) on investment securities	(45)	(8)	(221)	65
Net unrealized gains on other noninterest-bearing investments	0	0	3	2
Net unrealized holding gains (losses) on derivative instruments	(1)	0	(6)	0
Reclassification adjustment for increase in interest income recognized in earnings on derivatives instruments	1	0	2	(2)
Other comprehensive income (loss)	(45)	(8)	(222)	65
Comprehensive income	$ 178	$ 152	$ 436	$ 534

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Consolidated Statements Of Changes In Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	$ 7,634	$ 710	$ 4,725	$ 2,321	$ (122)
Additional Paid-in Capital			$ 0
Balance (in shares) at Dec. 31, 2016			203,085
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	469			469
Other comprehensive income, net of tax	65				65
Preferred Stock Redemption	(144)	(144)	$ 2	(2)
Stock Issued During Period, Value, Conversion of Convertible Securities
Stock Repurchased and Retired During Period, Value	(217)		$ (217)
Company Common Stock Repurchased, Shares			(4,975)
Net activity under employee plans and related tax benefits	42		$ 42
Net activity under employee plans and related tax benefits, shares			1,602
Dividends on preferred stock	(30)			(30)
Dividends on common stock	(58)			(58)
Balance (in shares) at Sep. 30, 2017			199,712
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	7,761	566	$ 4,552	2,700	(57)
Additional Paid-in Capital			0
Stockholders' Equity	7,679	566	4,445	2,807	(139)
Additional Paid-in Capital	$ 0			0
Common Stock, Adjustments			(4,052)
Adjustments to Additional Paid in Capital, Other			$ 4,052
Balance (in shares) at Dec. 31, 2017	197,532		197,532
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	$ 658			658
Other comprehensive income, net of tax	(222)				(222)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	1			1
Stock Repurchased and Retired During Period, Value	(434)		$ (434)
Net Shares Issued From Stock Warrant Exercises			1,278
Stock Issued During Period, Value, Stock Options Exercised
Company Common Stock Repurchased, Shares	8,000		(8,050)
Net activity under employee plans and related tax benefits	$ 41		$ 41
Net activity under employee plans and related tax benefits, shares			1,409
Dividends on preferred stock	(25)			(25)
Dividends on common stock	$ (145)			(145)
Balance (in shares) at Sep. 30, 2018	192,169		192,169
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	$ 7,553	$ 566	$ 0	$ 3,296	$ (361)
Additional Paid-in Capital	$ 4,052		$ 4,052

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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Common Stock, Dividends, Per Share, Declared	$ 0.74	$ 0.28

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Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$ 223	$ 160	$ 658	$ 469
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(11)	1	(46)	29
Depreciation and amortization	49	47	141	131
Share-based Compensation	4	4	22	21
Deferred income tax expense (benefit)	(6)	(4)	(4)	4
Net decrease (increase) in trading securities	31	5	(28)	59
Net decrease (increase) in loans held for sale	2	(18)	(32)	71
Change in other liabilities	20	84	105	63
Change in other assets	79	(42)	27	(9)
Other, net	(4)	(10)	(18)	(35)
Net cash provided by operating activities	387	227	825	803
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in money market investments	106	363	146	748
Proceeds from maturities and paydowns of investment securities held-to-maturity	170	83	284	249
Purchases of investment securities held-to-maturity	(43)	(54)	(265)	(127)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	992	615	2,396	1,775
Purchases of investment securities available-for-sale	(1,084)	(535)	(2,260)	(4,001)
Net change in loans and leases	(550)	(475)	(981)	(1,511)
Net change in other noninterest-bearing investments	33	14	29	(89)
Purchases of premises and equipment	(36)	(39)	(90)	(133)
Other, net	2	4	2	12
Net cash used in investing activities	(410)	(24)	(739)	(3,077)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	204	(278)	1,169	(1,136)
Net change in short-term funds borrowed	(377)	(718)	804	1,297
Proceeds from debt over 90 days and up to one year	0	1,850	0	3,600
Repayments of debt over 90 days and up to one year	0	(850)	(2,000)	(1,100)
Cash paid for preferred stock redemption	0	0	0	(144)
Proceeds from the issuance of long-term debt	497	0	497	0
Repayment of long-term debt	0	0	0	(153)
Proceeds from Issuance of Common Stock	2	2	19	20
Dividends paid on common and preferred stock	(68)	(34)	(172)	(89)
Bank common stock repurchased	(186)	(115)	(434)	(217)
Net cash provided by (used in) financing activities	72	(143)	(117)	2,078
Net increase (decrease) in cash and due from banks	49	60	(31)	(196)
Cash and due from banks at beginning of period	468	481	548	737	$ 737
Cash and due from banks at end of period	517	541	517	541	548
Cash paid for interest	57	27	157	79
Net cash paid for income taxes	51	84	142	206
Loans Held for Investment Transferred to Other Real Estate Owned	0	1	6	5
Loans Held for Investment Reclassified to Loans Held for Sale, Net	(1)	(3)	(38)	$ (14)
Available for sale securities purchased, not settled	$ 1	$ 25	$ 1		$ 25

XML

Basis of Presentaion

9 Months Ended

Sep. 30, 2018

Basis Of Presentation [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

BASIS OF PRESENTATION

The accompanying unaudited consolidated financial statements of Zions Bancorporation, National Association and its majority-owned subsidiaries (collectively “Zions Bancorporation, N.A.,” “the Bank,” “we,” “our,” “us”) have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board, are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force.

Operating results for the nine months endedSeptember 30, 2018 and 2017 are not necessarily indicative of the results that may be expected in future periods. In preparing the consolidated financial statements, we are required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The consolidated balance sheet at December 31, 2017 is from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Bank’s 2017 Annual Report on Form 10-K. Certain prior period amounts have been reclassified to conform with the current period presentation. These reclassifications did not affect net income or shareholders’ equity.

Zions Bancorporation, N.A. is a commercial bank headquartered in Salt Lake City, Utah. The Bank provides a full range of banking and related services in 11 Western and Southwestern states through 7 separately managed and branded units as follows: Zions Bank, in Utah, Idaho and Wyoming; Amegy Bank (“Amegy”), in Texas; California Bank & Trust (“CB&T”); National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“Vectra”), in Colorado and New Mexico; and The Commerce Bank of Washington (“TCBW”) which operates under that name in Washington and under the name The Commerce Bank of Oregon in Oregon.

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Certain Recent Accounting Pronouncements (Notes)

9 Months Ended

Sep. 30, 2018

Certain Recent Accounting Pronouncements [Abstract]

Certain Recent Accounting Pronouncements [Text Block]

RECENT ACCOUNTING PRONOUNCEMENTS

Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards not yet adopted by the Bank
ASU 2016-02, Leases (Topic 842) and subsequent related ASUs	The standard requires that a lessee recognize assets and liabilities for leases on the balance sheet. For leases with a term of 12 months or less, however, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee will depend primarily on its classification as a finance or operating lease. The standard also requires disclosures to better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements.	January 1, 2019	Upon adoption of the standard, we currently estimate the right-of-use asset to be between $200-$250 million. This estimate may change depending on the Bank’s lease activity. The implementation team is working on gathering all key lease data elements to meet the requirements of the new guidance. Additionally, we are implementing new lease software that will accommodate the new accounting requirements.
ASU 2017-08, Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities	The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium. The standard requires the premium to be amortized to the earliest call date. The update does not change the accounting for securities held at a discount.	January 1, 2019	Our analysis suggests this guidance will not have a material impact on the Bank’s financial statements, but we will continue to monitor its impact as we move closer to implementation.
ASU 2016-13, Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	The standard significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The standard replaces today’s “incurred loss” approach with an “expected loss” model for instruments such as loans and held-to-maturity (“HTM”) securities that are measured at amortized cost. The standard requires credit losses relating to available-for-sale (“AFS”) debt securities to be recorded through an allowance for credit loss (“ACL”) rather than a reduction of the carrying amount. It also changes the accounting for purchased credit-impaired debt securities and loans. The standard retains many of the current disclosure requirements in U.S. GAAP and expands certain disclosure requirements. Early adoption of the guidance is permitted as of January 1, 2019.	January 1, 2020	We have formed an implementation team led jointly by Credit, Treasury, and the Corporate Controller’s group, that also includes other lines of business and functions within the Bank. The implementation team is developing models that can meet the requirements of the new guidance. While this standard may potentially have a material impact on the Bank’s financial statements, we are still in process of conducting our evaluation.
ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	The standard eliminates the requirement to calculate the implied fair value of goodwill (i.e. Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, entities would record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current guidance). The standard does not change the guidance on completing Step 1 of the goodwill impairment test. The standard also continues to allow entities to perform the optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The standard is effective for the Bank as of January 1, 2020. Early adoption is allowed for any goodwill impairment test performed after January 1, 2017.	January 1, 2020	We do not currently expect this guidance will have a material impact on the Bank’s financial statements since the fair values of our reporting units were not lower than their respective carrying amounts at the time of our goodwill impairment analysis for 2017.

Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards not yet adopted by the Bank (continued)
ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement	The purpose of this standard is to improve the effectiveness of disclosures in the notes to the financial statements. The update outlines removals, modifications, and additions to the disclosure requirements on fair value measurement.	January 1, 2020	This standard will not have a material impact to the financial statements as its only impact is to the disclosure requirements for fair value measurement. We will update the impacted disclosures at the effective date.
ASU 2018-15, Intangibles – Goodwill and Other-Internal-Use Software (Topic 350-40): Customer’s Accounting for Implementation Cost Incurred in a Cloud Computing Arrangement That Is a Service Contract	The standard provides revised accounting guidance related to the accounting for implementation costs associated with cloud computing arrangements that meet the criteria for a service contract. Some of the main provisions include: -Implementation costs will be recognized as an asset or expense when incurred on the basis of existing GAAP, specifically guidance already provided around internal-use software. The amortization period will be the noncancelable hosting contract term plus any expected renewal periods. Entity in a hosting arrangement that is a service contract must provide certain qualitative and quantitative disclosures. Disclosures would also include implementation costs incurred for internal-use software. For transition there is an option to either apply guidance retrospectively or prospectively.	January 1, 2020	We are currently evaluating the potential impact of this new guidance on the Bank’s financial statements.
Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards adopted by the Bank
ASU 2014-09, Revenue from Contracts with Customers (Topic 606) and subsequent related ASUs	The core principle of the new guidance is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The banking industry does not expect significant changes because major sources of revenue are from financial instruments that have been excluded from the scope of the new standard, (including loans, derivatives, debt and equity securities, etc.). However, these new standards affect other fees charged by banks, such as asset management fees, credit card interchange fees, deposit account fees, etc. Adoption may be made on a full retrospective basis with practical expedients, or on a modified retrospective basis with a cumulative effect adjustment. Additionally, the new guidance significantly increases the disclosures related to revenue recognition practices.	January 1, 2018	We adopted this guidance using the modified retrospective transition method. There was no material impact at adoption to the Bank’s consolidated financial statements. New disclosures are found in Footnote 10.

Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Standards adopted by the Bank (continued)
ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	The standard provides revised accounting guidance related to the accounting for and reporting of financial instruments. Some of the main provisions include: – Equity investments that do not result in consolidation and are not accounted for under the equity method would be measured at fair value through net income. – Changes in instrument-specific credit risk for financial liabilities that are measured under the fair value option would be recognized in other comprehensive income (“OCI”). – Elimination of the requirement to disclose the methods and significant assumptions used to estimate the fair value of financial instruments carried at amortized cost. However, it will require the use of exit price when measuring the fair value of financial instruments measured at amortized cost for disclosure purposes.	January 1, 2018	The transition adjustment upon adoption of this guidance was not material. We refined our valuation models to better account for an exit price, which does not impact our financial statements, but does have an impact on our disclosures, as provided in Footnote 3.
ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities	The purpose of this standard is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. The standard is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. The standard requires a modified retrospective transition method that requires recognition of the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption.	January 1, 2018	We early adopted this guidance in the first quarter. The adoption of this guidance did not have a material impact on our consolidated financial statements at transition.

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Fair Value

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value

FAIR VALUE

Fair Value Measurement

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. For a discussion of the Bank’s valuation methodologies for assets and liabilities measured at fair value and the fair value hierarchy, see Note 3 of our 2017 Annual Report on Form 10-K.

Quantitative Disclosure by Fair Value Hierarchy

Assets and liabilities measured at fair value by class on a recurring basis are summarized as follows:

(In millions)	September 30, 2018
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	25	$	13,292	$	—	$	13,317
Municipal securities			1,284				1,284
Other debt securities			24				24
Total Available-for-sale	25		14,600		—		14,625
Trading account	119		57				176
Other noninterest-bearing investments:
Bank-owned life insurance			516				516
Private equity investments					103		103
Other assets:
Agriculture loan servicing and interest-only strips					18		18
Deferred compensation plan assets	108						108
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			18				18
Foreign currency exchange contracts	4						4
Total Assets	$	256	$	15,192	$	121	$	15,569
LIABILITIES
Securities sold, not yet purchased	$	49	$	—	$	—	$	49
Other liabilities:
Deferred compensation plan obligations	108						108
Derivatives:
Interest rate swaps for customers			73				73
Foreign currency exchange contracts	3						3
Total Liabilities	$	160	$	73	$	—	$	233

¹We used a third-party pricing service to measure fair value for approximately 95% of our AFS Level 2 securities.

(In millions)	December 31, 2017
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	25	$	13,706	$	—	$	13,731
Municipal securities			1,334				1,334
Other debt securities			24				24
Money market mutual funds and other	71		1				72
Total Available-for-sale	96		15,065		—		15,161
Trading account			148				148
Other noninterest-bearing investments:
Bank-owned life insurance			507				507
Private equity investments					95		95
Other assets:
Agriculture loan servicing and interest-only strips					18		18
Deferred compensation plan assets	102						102
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			28				28
Foreign currency exchange contracts	9						9
Total Assets	$	207	$	15,749	$	113	$	16,069
LIABILITIES
Securities sold, not yet purchased	$	95	$	—	$	—	$	95
Other liabilities:
Deferred compensation plan obligations	102						102
Derivatives:
Interest rate swaps for customers			33				33
Foreign currency exchange contracts	7						7
Total Liabilities	$	204	$	33	$	—	$	237

¹We used a third-party pricing service to measure fair value for approximately 92% of our AFS Level 2 securities.

Level 3 Valuations

Private Equity Investments

Private equity investments (“PEIs”) are generally measured under Level 3. Certain investments that have converted to being publicly-traded are measured under Level 1. The majority of these PEIs are held in the Bank’s Small Business Investment Company (“SBIC”) and are early-stage venture investments. The fair value measurements of these investments are updated at least on a quarterly basis, including whenever a new round of financing occurs. Certain of these investments are measured using multiples of operating performance. The fair value measurements of PEIs are reviewed on a quarterly basis by the Securities Valuation Committee. The Equity Investments Committee, consisting of executives familiar with the investments, reviews periodic financial information, including audited financial statements when available.

Certain valuation analytics may be employed that include current and projected financial performance, recent financing activities, economic and market conditions, market comparables, market liquidity, sales restrictions, and other factors. A significant change in the expected performance of the individual investment would result in a change in the fair value measurement of the investment. The amount of unfunded commitments to invest is disclosed in Note 5. Certain restrictions apply for the redemption of these investments and certain investments are prohibited by the Volcker Rule. See discussions in Note 5.

Agriculture Loan Servicing

This asset results from our servicing of agriculture loans approved and funded by Federal Agricultural Mortgage Corporation (“FAMC”). We provide this servicing under an agreement with FAMC for loans they own. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies.

Interest-Only Strips

Interest-only strips are created as a by-product of the securitization process. When the guaranteed portions of Small Business Administration (“SBA”) 7(a) loans are pooled, interest-only strips may be created in the pooling process. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies.

Reconciliation of Level 3 Fair Value Measurements

The following reconciles the beginning and ending balances of assets and liabilities that are measured at fair value by class on a recurring basis using Level 3 inputs:

	Level 3 Instruments
	Three Months Ended									Nine Months Ended
	September 30, 2018					September 30, 2017				September 30, 2018				September 30, 2017
(In millions)	Private equity investments			Ag loan svcg and int-only strips		Private equity investments		Ag loan svcg and int-only strips		Private equity investments		Ag loan svcg and int-only strips		Private equity investments			Ag loan svcg and int-only strips
Balance at beginning of period	$	102		$	18	$	82	$	19	$	95	$	18	$	73		$	20
Securities gains (losses), net	(1		)	—		5		—		—		—		7			—
Other noninterest income	—			—		—		—		—		—		—			(1		)
Purchases	2			—		6		—		8		—		18			—
Redemptions and paydowns	—			—		—		—		—		—		(5		)	—
Balance at end of period	$	103		$	18	$	93	$	19	$	103	$	18	$	93		$	19

No transfers of assets or liabilities occurred among Levels 1, 2 or 3 for the three and nine months ended September 30, 2018 and 2017.

The reconciliation of Level 3 instruments includes the following realized gains and losses in the statement of income:

(In millions)	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018			2017
Securities gains (losses), net	$	—	$	—	$	(3	)	$	3

Nonrecurring Fair Value Measurements

Included in the balance sheet amounts are the following amounts of assets that had fair value changes measured on a nonrecurring basis.

(In millions)	Fair value at September 30, 2018								Fair value at December 31, 2017
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS
Private equity investments	$	—	$	—	$	—	$	—	$	—	$	—	$	1	$	1
Impaired loans	—		23		—		23		—		9		—		9
Other real estate owned	—		1		—		1		—		—		—		—
Total	$	—	$	24	$	—	$	24	$	—	$	9	$	1	$	10

The previous fair values may not be current as of the dates indicated, but rather as of the date the fair value change occurred, such as a charge for impairment. Accordingly, carrying values may not equal current fair value.

	Gains (losses) from fair value changes
(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
ASSETS
Private equity investments	$	—		$	—		$	—		$	(1	)
Impaired loans	(9		)	(1		)	(15		)	(8		)
Other real estate owned	—			—			(1		)	—
Total	$	(9	)	$	(1	)	$	(16	)	$	(9	)

During the three months ended September 30, we recognized an insignificant amount of net gains in 2018 and $1 million2017 from the sale of other real estate owned (“OREO”) properties. During the nine months endedSeptember 30, we recognized approximately $1 million of net gains in 2018 and $2 million in 2017 from the sale of OREO properties that had a carrying value at the time of sale of approximately $3 million and $5 million during the nine months endedSeptember 30, 2018 and 2017, respectively. Previous to their sale in these periods, we recognized impairment on these properties of an insignificant amount in 2018 and 2017.

Private equity investments carried at cost were measured at fair value for impairment purposes according to the methodology previously discussed for these investments. Amounts of PEIs carried at cost were $11 million at September 30, 2018 and $10 million at December 31, 2017. Amounts of other noninterest-bearing investments carried at cost were $311 million at September 30, 2018 and $338 million at December 31, 2017, which were comprised of Federal Reserve and Federal Home Loan Bank (“FHLB”) stock. Private equity investments accounted for using the equity method were $34 million at September 30, 2018 and $36 million at December 31, 2017.

Impaired (or nonperforming) loans that are collateral-dependent were measured at fair value based on the fair value of the collateral. OREO was measured initially at fair value based on collateral appraisals at the time of transfer and subsequently at the lower of cost or fair value. For additional information regarding the measurement of fair value for impaired loans, collateral-dependent loans, and OREO, see Note 3 of our 2017 Annual Report on Form 10-K.

Fair Value of Certain Financial Instruments

Following is a summary of the carrying values and estimated fair values of certain financial instruments:

	September 30, 2018					December 31, 2017
(In millions)	Carrying value		Estimated fair value		Level	Carrying value		Estimated fair value		Level
Financial assets:
HTM investment securities	$	751	$	734	2	$	770	$	762	2
Loans and leases (including loans held for sale), net of allowance	45,391		44,452		3	44,306		44,226		3
Financial liabilities:
Time deposits	4,256		4,231		2	3,115		3,099		2
Other short-term borrowings	2,900		2,900		2	3,600		3,600		2
Long-term debt	879		885		2	383		402		2

This summary excludes financial assets and liabilities for which carrying value approximates fair value and financial instruments that are recorded at fair value on a recurring basis. With the adoption of ASU 2016-01, we have updated our process for estimating the fair value for our loans and leases, net of allowance. Our updated process identifies an exit price using current origination rates, making certain adjustments based on credit and utilizing publicly available rates and indices. For additional information regarding the financial instruments within the scope of this disclosure, and the methods and significant assumptions used to estimate their fair value, see Note 3 of our 2017 Annual Report on Form 10-K.

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Offsetting Assets and Liabilities (Notes)

9 Months Ended

Sep. 30, 2018

Offsetting Assets and Liabilities [Abstract]

Cash, Cash Equivalents, and Short-term Investments [Text Block]

OFFSETTING ASSETS AND LIABILITIES

Gross and net information for selected financial instruments in the balance sheet is as follows:

	September 30, 2018
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	781	$	(221	)	$	560	$	—		$	—		$	560
Derivatives (included in other assets)	23		—			23		(13		)	(8		)	2
Total assets	$	804	$	(221	)	$	583	$	(13	)	$	(8	)	$	562
Liabilities:
Federal funds and other short-term borrowings	$	4,001	$	(221	)	$	3,780	$	—		$	—		$	3,780
Derivatives (included in other liabilities)	76		—			76		(13		)	—			63
Total Liabilities	$	4,077	$	(221	)	$	3,856	$	(13	)	$	—		$	3,843

	December 31, 2017
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	809	$	(295	)	$	514	$	—		$	—		$	514
Derivatives (included in other assets)	38		—			38		(9		)	(1		)	28
Total assets	$	847	$	(295	)	$	552	$	(9	)	$	(1	)	$	542
Liabilities:
Federal funds and other short-term borrowings	$	5,271	$	(295	)	$	4,976	$	—		$	—		$	4,976
Derivatives (included in other liabilities)	40		—			40		(9		)	(6		)	25
Total Liabilities	$	5,311	$	(295	)	$	5,016	$	(9	)	$	(6	)	$	5,001

Security repurchase and reverse repurchase (“resell”) agreements are offset, when applicable, in the balance sheet according to master netting agreements. Security repurchase agreements are included with “Federal funds and other short-term borrowings.” Derivative instruments may be offset under their master netting agreements; however, for accounting purposes, we present these items on a gross basis in the Bank’s balance sheet. See Note 7 for further information regarding derivative instruments.

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Investment Securities

9 Months Ended

Sep. 30, 2018

Investments [Abstract]

Investment Securities

INVESTMENTS

Investment Securities

Securities are classified as HTM, AFS or trading. HTM securities, which management has the intent and ability to hold until maturity, are carried at amortized cost. AFS securities are carried at fair value and unrealized gains and losses are reported as net increases or decreases to accumulated other comprehensive income (“AOCI”). Realized gains and losses on AFS securities are determined by using the cost basis of each individual security. Trading securities are carried at fair value with gains and losses recognized in current period earnings. The purchase premiums and discounts for both HTM and AFS securities are amortized and accreted at a constant effective yield to the contractual maturity date and no assumption is made concerning prepayments. As principal prepayments occur, the portion of the unamortized premium or discount associated with the principal reduction is recognized in interest income in the period the principal is reduced. Note 3 of our 2017 Annual Report on Form 10-K discusses the process to estimate fair value for investment securities.

	September 30, 2018
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	751	$	4	$	21	$	734
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,480		—		32		1,448
Agency guaranteed mortgage-backed securities	10,159		6		341		9,824
Small Business Administration loan-backed securities	2,069		1		50		2,020
Municipal securities	1,313		1		30		1,284
Other debt securities	25		—		1		24
Total available-for-sale	15,071		8		454		14,625
Total investment securities	$	15,822	$	12	$	475	$	15,359

	December 31, 2017
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	770	$	5	$	13	$	762
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,830		1		13		1,818
Agency guaranteed mortgage-backed securities	9,798		9		141		9,666
Small Business Administration loan-backed securities	2,227		10		15		2,222
Municipal securities	1,336		9		11		1,334
Other debt securities	25		—		1		24
Total available-for-sale debt securities	15,241		29		181		15,089
Money market mutual funds and other	72		—		—		72
Total available-for-sale	15,313		29		181		15,161
Total investment securities	$	16,083	$	34	$	194	$	15,923

Maturities

The amortized cost and estimated fair value of investment debt securities are shown subsequently as of September 30, 2018, by expected timing of principal payments. Actual principal payments may differ from contractual or expected principal payments because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	September 30, 2018
	Held-to-maturity				Available-for-sale
(In millions)	Amortized cost		Estimated fair value		Amortized cost		Estimated fair value
Due in one year or less	$	201	$	199	$	1,572	$	1,528
Due after one year through five years	356		349		4,874		4,733
Due after five years through ten years	139		135		4,650		4,509
Due after ten years	55		51		3,975		3,855
Total	$	751	$	734	$	15,071	$	14,625

The following is a summary of the amount of gross unrealized losses for debt securities and the estimated fair value by length of time the securities have been in an unrealized loss position:

	September 30, 2018
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	4	$	227	$	17	$	343	$	21	$	570
Available-for-sale
U.S. Treasury securities	—		25		—		—		—		25
U.S. Government agencies and corporations:
Agency securities	20		970		12		354		32		1,324
Agency guaranteed mortgage-backed securities	92		3,821		249		5,354		341		9,175
Small Business Administration loan-backed securities	25		1,414		25		559		50		1,973
Municipal securities	15		834		15		331		30		1,165
Other	—		—		1		14		1		14
Total available-for-sale	152		7,064		302		6,612		454		13,676
Total	$	156	$	7,291	$	319	$	6,955	$	475	$	14,246

	December 31, 2017
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value
Held-to-maturity
Municipal securities	$	3	$	263	$	10	$	292	$	13	$	555
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	6		808		7		808		13		1,616
Agency guaranteed mortgage-backed securities	29		3,609		112		4,721		141		8,330
Small Business Administration loan-backed securities	3		408		12		649		15		1,057
Municipal securities	6		554		5		230		11		784
Other	—		—		1		14		1		14
Total available-for-sale	44		5,379		137		6,422		181		11,801
Total	$	47	$	5,642	$	147	$	6,714	$	194	$	12,356

At September 30, 2018 and December 31, 2017, respectively, 676 and 667 HTM and 3,018 and 2,262 AFS investment securities were in an unrealized loss position.

Other-Than-Temporary Impairment

The Bank did not recognize any other-than-temporary impairment (“OTTI”) on its investment securities portfolio during the first nine months of 2018. We review investment securities on a quarterly basis for the presence of OTTI. Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At September 30, 2018, we did not have an intent to sell identified securities with unrealized losses or initiate such sales, and we believe it is not more likely than not we would be required to sell such securities before recovery of their amortized cost basis. For additional information on our policy and evaluation process relating to OTTI, see Note 5 of our 2017 Annual Report on Form 10-K.

The following summarizes gains and losses that were recognized in the statement of income:

	Three Months Ended September 30,									Nine Months Ended September 30,
	2018					2017				2018					2017
(In millions)	Gross gains		Gross losses			Gross gains		Gross losses		Gross gains		Gross losses			Gross gains		Gross losses
Investment securities:
Other noninterest-bearing investments	$	4	$	5		$	5	$	—	$	9	$	10		$	20	$	7
Net gains (losses) 1			$	(1	)			$	5			$	(1	)			$	13

¹ Net gains (losses) were recognized in securities gains (losses), net in the statement of income.

Interest income by security type is as follows:

	Three Months Ended September 30,
(In millions)	2018						2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	3	$	4	$	7	$	2	$	3	$	5
Available-for-sale	73		6		79		72		6		78
Trading	—		—		—		1		—		1
Total	$	76	$	10	$	86	$	75	$	9	$	84

	Nine Months Ended September 30,
(In millions)	2018						2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	8	$	11	$	19	$	7	$	10	$	17
Available-for-sale	216		19		235		209		18		227
Trading	3		—		3		2		—		2
Total	$	227	$	30	$	257	$	218	$	28	$	246

Investment securities with a carrying value of $2.1 billion at both September 30, 2018 andDecember 31, 2017 were pledged to secure public and trust deposits, advances, and for other purposes as required by law. Securities are also pledged as collateral for security repurchase agreements.

Private Equity Investments

Effect of Volcker Rule

The Bank’s PEIs are subject to the provisions of the Dodd-Frank Wall Street Reform and Consumer Protection Act (“Dodd-Frank Act”). The Volcker Rule of the Dodd-Frank Act prohibits banks from holding PEIs, except for SBIC funds and certain other permitted exclusions, beyond a required deadline. Of the recorded PEIs of $148 million at September 30, 2018, approximately $3 million remain prohibited by the Volcker Rule. At September 30, 2018, we have $31 million of unfunded commitments for PEIs, of which approximately $2 million relate to prohibited PEIs. We currently do not believe that this divestiture requirement will ultimately have a material impact on our financial statements. See other discussions related to private equity investments in Note 3.

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Loans And Allowance For Credit Losses

9 Months Ended

Sep. 30, 2018

Loans And Allowance For Credit Losses [Abstract]

Loans And Allowance For Credit Losses

LOANS AND ALLOWANCE FOR CREDIT LOSSES

Loans and Loans Held for Sale

Loans are summarized as follows according to major portfolio segment and specific loan class:

(In millions)	September 30, 2018		December 31, 2017
Loans held for sale	$	61	$	44
Commercial:
Commercial and industrial	$	14,096	$	14,003
Leasing	332		364
Owner-occupied	7,548		7,288
Municipal	1,563		1,271
Total commercial	23,539		22,926
Commercial real estate:
Construction and land development	2,295		2,021
Term	8,752		9,103
Total commercial real estate	11,047		11,124
Consumer:
Home equity credit line	2,884		2,777
1-4 family residential	7,039		6,662
Construction and other consumer real estate	644		597
Bankcard and other revolving plans	483		509
Other	174		185
Total consumer	11,224		10,730
Total loans 1	$	45,810	$	44,780

¹Loans are presented net of unearned income, unamortized purchase discounts and premiums, and net deferred loan fees and costs totaling $42 million and $43 million at September 30, 2018 and December 31, 2017, respectively.

Municipal loans generally include loans to state and local governments (“municipalities”) with the debt service being repaid from general funds or pledged revenues of the municipal entity, or to private commercial entities or 501(c)(3) not-for-profit entities utilizing a pass-through municipal entity to achieve favorable tax treatment.

Land development loans included in the construction and land development loan class were $224 million at September 30, 2018 and $220 million at December 31, 2017.

Loans with a carrying value of approximately $23.4 billion at September 30, 2018 and $25.6 billion at December 31, 2017 have been pledged at the Federal Reserve or the FHLB of Des Moines as collateral for current and potential borrowings.

We sold loans totaling $152 million and $464 million for the three and nine months endedSeptember 30, 2018 and $146 million and $696 million for the three and nine months endedSeptember 30, 2017, respectively, that were classified as loans held for sale. The sold loans were derecognized from the balance sheet. Loans classified as loans held for sale primarily consist of conforming residential mortgages and the guaranteed portion of SBA loans. The loans are mainly sold to U.S. government agencies or participated to third parties. At times, we have continuing involvement in the transferred loans in the form of servicing rights or a guarantee from the respective issuer. Amounts added to loans held for sale during these same periods was $184 million and $584 million for the three and nine months endedSeptember 30, 2018 and $176 million and $640 million for the three and nine months endedSeptember 30, 2017, respectively. See Note 5 for further information regarding guaranteed securities.

The principal balance of sold loans for which we retain servicing was approximately $2.2 billion at both September 30, 2018 and December 31, 2017. Income from loans sold, excluding servicing, was $3 million and $10 million for the three and nine months endedSeptember 30, 2018, and $1 million and $9 million for the three and nine months endedSeptember 30, 2017, respectively.

Allowance for Credit Losses

The allowance for credit losses (“ACL”) consists of the allowance for loan and lease losses (“ALLL”) and the reserve for unfunded lending commitments (“RULC”). The ALLL represents our estimate of probable and estimable losses inherent in the loan and lease portfolio as of the balance sheet date. We also estimate a reserve for potential losses associated with off-balance sheet commitments, including standby letters of credit. We determine the RULC using the same procedures and methodologies that we use for the ALLL.

For additional information regarding our policies and methodologies used to estimate the ACL, see Note 6 of our 2017 Annual Report on Form 10-K.

Changes in the allowance for credit losses are summarized as follows:
	Three Months Ended September 30, 2018
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	321		$	122		$	47	$	490
Provision for loan losses	(11		)	(5		)	5		(11		)
Gross loan and lease charge-offs	8			5			4		17
Recoveries	12			3			3		18
Net loan and lease charge-offs (recoveries)	(4		)	2			1		(1		)
Balance at end of period	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments
Balance at beginning of period	$	43		$	15		$	—	$	58
Provision for unfunded lending commitments	(1		)	1			—		—
Balance at end of period	$	42		$	16		$	—	$	58
Total allowance for credit losses at end of period
Allowance for loan losses	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments	42			16			—		58
Total allowance for credit losses	$	356		$	131		$	51	$	538

	Nine Months Ended September 30, 2018
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	371		$	103		$	44	$	518
Provision for loan losses	(69		)	9			14		(46		)
Gross loan and lease charge-offs	38			5			13		56
Recoveries	50			8			6		64
Net loan and lease charge-offs (recoveries)	(12		)	(3		)	7		(8		)
Balance at end of period	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments
Balance at beginning of period	$	48		$	10		$	—	$	58
Provision for unfunded lending commitments	(6		)	6			—		—
Balance at end of period	$	42		$	16		$	—	$	58
Total allowance for credit losses at end of period
Allowance for loan losses	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments	42			16			—		58
Total allowance for credit losses	$	356		$	131		$	51	$	538

	Three Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	393		$	116		$	35	$	544
Provision for loan losses	(4		)	(7		)	16		5
Gross loan and lease charge-offs	16			4			5		25
Recoveries	12			2			3		17
Net loan and lease charge-offs (recoveries)	4			2			2		8
Balance at end of period	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	53		$	10		$	—	$	63
Provision for unfunded lending commitments	(4		)	—			—		(4		)
Balance at end of period	$	49		$	10		$	—	$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments	49			10			—		59
Total allowance for credit losses	$	434		$	117		$	49	$	600

	Nine Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	420		$	116		$	31	$	567
Provision for loan losses	27			(15		)	23		35
Gross loan and lease charge-offs	98			6			13		117
Recoveries	36			12			8		56
Net loan and lease charge-offs (recoveries)	62			(6		)	5		61
Balance at end of period	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	54		$	11		$	—	$	65
Provision for unfunded lending commitments	(5		)	(1		)	—		(6		)
Balance at end of period	$	49		$	10		$	—	$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments	49			10			—		59
Total allowance for credit losses	$	434		$	117		$	49	$	600

The ALLL and outstanding loan balances according to the Bank’s impairment method are summarized as follows:
	September 30, 2018
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	10	$	1	$	3	$	14
Collectively evaluated for impairment	304		114		48		466
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	314	$	115	$	51	$	480
Outstanding loan balances:
Individually evaluated for impairment	$	201	$	65	$	74	$	340
Collectively evaluated for impairment	23,338		10,982		11,150		45,470
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	23,539	$	11,047	$	11,224	$	45,810

	December 31, 2017
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	26	$	1	$	4	$	31
Collectively evaluated for impairment	345		102		40		487
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	371	$	103	$	44	$	518
Outstanding loan balances:
Individually evaluated for impairment	$	314	$	69	$	76	$	459
Collectively evaluated for impairment	22,598		11,048		10,648		44,294
Purchased loans with evidence of credit deterioration	14		7		6		27
Total	$	22,926	$	11,124	$	10,730	$	44,780

Nonaccrual and Past Due Loans

Loans are generally placed on nonaccrual status when payment in full of principal and interest is not expected, or the loan is 90 days or more past due as to principal or interest, unless the loan is both well secured and in the process of collection. For further discussion of our policies and processes regarding nonaccrual and past due loans, see Note 6 of our 2017 Annual Report on Form 10-K.

Nonaccrual loans are summarized as follows:
(In millions)	September 30, 2018		December 31, 2017
Loans held for sale	$	—	$	12
Commercial:
Commercial and industrial	$	112	$	195
Leasing	2		8
Owner-occupied	66		90
Municipal	1		1
Total commercial	181		294
Commercial real estate:
Construction and land development	—		4
Term	46		36
Total commercial real estate	46		40
Consumer:
Home equity credit line	13		13
1-4 family residential	47		55
Construction and other consumer real estate	—		—
Bankcard and other revolving plans	1		—
Other	—		—
Total consumer loans	61		68
Total	$	288	$	402

Past due loans (accruing and nonaccruing) are summarized as follows:
	September 30, 2018
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	61	$	—	$	—	$	—	$	61	$	—	$	—
Commercial:
Commercial and industrial	$	14,006	$	40	$	50	$	90	$	14,096	$	6	$	63
Leasing	331		—		1		1		332		—		1
Owner-occupied	7,500		26		22		48		7,548		2		41
Municipal	1,563		—		—		—		1,563		—		1
Total commercial	23,400		66		73		139		23,539		8		106
Commercial real estate:
Construction and land development	2,295		—		—		—		2,295		—		—
Term	8,728		16		8		24		8,752		3		32
Total commercial real estate	11,023		16		8		24		11,047		3		32
Consumer:
Home equity credit line	2,872		5		7		12		2,884		—		4
1-4 family residential	7,008		15		16		31		7,039		—		23
Construction and other consumer real estate	634		10		—		10		644		—		—
Bankcard and other revolving plans	478		3		2		5		483		1		—
Other	173		1		—		1		174		—		—
Total consumer loans	11,165		34		25		59		11,224		1		27
Total	$	45,588	$	116	$	106	$	222	$	45,810	$	12	$	165

	December 31, 2017
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	44	$	—	$	—	$	—	$	44	$	—	$	12
Commercial:
Commercial and industrial	$	13,887	$	60	$	56	$	116	$	14,003	$	13	$	146
Leasing	363		1		—		1		364		—		8
Owner-occupied	7,219		29		40		69		7,288		4		49
Municipal	1,271		—		—		—		1,271		—		1
Total commercial	22,740		90		96		186		22,926		17		204
Commercial real estate:
Construction and land development	2,014		3		4		7		2,021		—		—
Term	9,079		13		11		24		9,103		2		25
Total commercial real estate	11,093		16		15		31		11,124		2		25
Consumer:
Home equity credit line	2,763		9		5		14		2,777		—		5
1-4 family residential	6,621		16		25		41		6,662		1		27
Construction and other consumer real estate	590		6		1		7		597		1		—
Bankcard and other revolving plans	506		2		1		3		509		1		—
Other	184		1		—		1		185		—		—
Total consumer loans	10,664		34		32		66		10,730		3		32
Total	$	44,497	$	140	$	143	$	283	$	44,780	$	22	$	261

¹  Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Credit Quality Indicators

In addition to the past due and nonaccrual criteria, we also analyze loans using loan risk-grading systems, which vary based on the size and type of credit risk exposure. The internal risk grades assigned to loans follow our definitions of Pass, Special Mention, Sub-standard, and Doubtful, which are consistent with published definitions of regulatory risk classifications. For further discussion of our policies and processes regarding credit quality indicators and internal loan risk-grading, see Note 6 of our 2017 Annual Report on Form 10-K.

Outstanding loan balances (accruing and nonaccruing) categorized by these credit quality classifications are summarized as follows:

	September 30, 2018
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	13,416	$	311	$	369	$	—	$	14,096
Leasing	318		10		4		—		332
Owner-occupied	7,253		84		211		—		7,548
Municipal	1,536		4		23		—		1,563
Total commercial	22,523		409		607		—		23,539		$	314
Commercial real estate:
Construction and land development	2,284		11		—		—		2,295
Term	8,631		18		103		—		8,752
Total commercial real estate	10,915		29		103		—		11,047		115
Consumer:
Home equity credit line	2,866		—		18		—		2,884
1-4 family residential	6,988		—		51		—		7,039
Construction and other consumer real estate	642		—		2		—		644
Bankcard and other revolving plans	480		—		3		—		483
Other	174		—		—		—		174
Total consumer loans	11,150		—		74		—		11,224		51
Total	$	44,588	$	438	$	784	$	—	$	45,810	$	480

	December 31, 2017
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	13,001	$	395	$	606	$	1	$	14,003
Leasing	342		6		16		—		364
Owner-occupied	6,920		93		275		—		7,288
Municipal	1,257		13		1		—		1,271
Total commercial	21,520		507		898		1		22,926		$	371
Commercial real estate:
Construction and land development	2,002		15		4		—		2,021
Term	8,816		138		149		—		9,103
Total commercial real estate	10,818		153		153		—		11,124		103
Consumer:
Home equity credit line	2,759		—		18		—		2,777
1-4 family residential	6,602		—		60		—		6,662
Construction and other consumer real estate	596		—		1		—		597
Bankcard and other revolving plans	507		—		2		—		509
Other	185		—		—		—		185
Total consumer loans	10,649		—		81		—		10,730		44
Total	$	42,987	$	660	$	1,132	$	1	$	44,780	$	518

Impaired Loans

Loans are considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due in accordance with the contractual terms of the loan agreement, including scheduled interest payments. Payments received on impaired loans that are accruing are recognized in interest income, according to the contractual loan agreement. Payments received on impaired loans that are on nonaccrual are not recognized in interest income, but are applied as a reduction to the principal outstanding. The amount of interest income recognized on a cash basis during the time the loans were impaired within the three months ended September 30, 2018 and 2017 was not significant. For additional information regarding our policies and methodologies used to evaluate impaired loans, see Note 6 of our 2017 Annual Report on Form 10-K.

Information on impaired loans individually evaluated is summarized as follows, including the average recorded investment and interest income recognized for the three and nine months endedSeptember 30, 2018 and 2017:

	September 30, 2018
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	170	$	72	$	47	$	119	$	8
Owner-occupied	66		39		21		60		2
Municipal	1		1		—		1		—
Total commercial	237		112		68		180		10
Commercial real estate:
Construction and land development	1		—		1		1		—
Term	59		44		5		49		—
Total commercial real estate	60		44		6		50		—
Consumer:
Home equity credit line	16		12		2		14		3
1-4 family residential	70		33		26		59		—
Construction and other consumer real estate	2		1		—		1		—
Other	—		—		—		—		—
Total consumer loans	88		46		28		74		3
Total	$	385	$	202	$	102	$	304	$	13

	December 31, 2017
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	293	$	80	$	142	$	222	$	24
Owner-occupied	120		79		23		102		2
Municipal	1		1		—		1		—
Total commercial	414		160		165		325		26
Commercial real estate:
Construction and land development	8		4		2		6		—
Term	56		36		12		48		—
Total commercial real estate	64		40		14		54		—
Consumer:
Home equity credit line	25		13		9		22		—
1-4 family residential	67		28		29		57		4
Construction and other consumer real estate	2		1		1		2		—
Other	1		1		—		1		—
Total consumer loans	95		43		39		82		4
Total	$	573	$	243	$	218	$	461	$	30

	Three Months Ended September 30, 2018				Nine Months Ended September 30, 2018
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	124	$	—	$	108	$	—
Owner-occupied	51		—		46		8
Municipal	1		—		1		—
Total commercial	176		—		155		8
Commercial real estate:
Construction and land development	1		—		1		—
Term	49		—		50		1
Total commercial real estate	50		—		51		1
Consumer:
Home equity credit line	14		—		13		—
1-4 family residential	58		—		53		—
Construction and other consumer real estate	1		—		1		—
Other	—		—		—		—
Total consumer loans	73		—		67		—
Total	$	299	$	—	$	273	$	9

	Three Months Ended September 30, 2017				Nine Months Ended September 30, 2017
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	356	$	1	$	311	$	5
Owner-occupied	104		2		101		5
Municipal	1		—		1		—
Total commercial	461		3		413		10
Commercial real estate:
Construction and land development	10		—		11		—
Term	53		1		58		11
Total commercial real estate	63		1		69		11
Consumer:
Home equity credit line	21		—		21		1
1-4 family residential	53		1		53		1
Construction and other consumer real estate	2		—		2		—
Other	1		—		1		—
Total consumer loans	77		1		77		2
Total	$	601	$	5	$	559	$	23

Modified and Restructured Loans

Loans may be modified in the normal course of business for competitive reasons or to strengthen the Bank’s position. Loan modifications and restructurings may also occur when the borrower experiences financial difficulty and needs temporary or permanent relief from the original contractual terms of the loan. Loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for which the Bank has granted a concession that it would not otherwise consider, are considered troubled debt restructurings (“TDRs”). For further discussion of our policies and processes regarding TDRs, see Note 6 of our 2017 Annual Report on Form 10-K.

Selected information on TDRs that includes the recorded investment on an accruing and nonaccruing basis by loan class and modification type is summarized in the following schedules:

	September 30, 2018
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	4	$	—	$	—	$	15	$	7	$	26
Owner-occupied	1		2		—		—		1		16		20
Municipal	—		—		—		—		—		—		—
Total commercial	1		6		—		—		16		23		46
Commercial real estate:
Construction and land development	—		—		—		—		—		1		1
Term	4		2		—		1		—		6		13
Total commercial real estate	4		2		—		1		—		7		14
Consumer:
Home equity credit line	—		2		8		—		—		3		13
1-4 family residential	1		1		6		—		2		30		40
Construction and other consumer real estate	—		—		—		—		—		1		1
Total consumer loans	1		3		14		—		2		34		54
Total accruing	6		11		14		1		18		64		114
Nonaccruing
Commercial:
Commercial and industrial	—		6		1		1		12		38		58
Owner-occupied	1		2		—		1		1		5		10
Municipal	—		—		—		—		—		1		1
Total commercial	1		8		1		2		13		44		69
Commercial real estate:
Term	3		—		—		2		4		1		10
Total commercial real estate	3		—		—		2		4		1		10
Consumer:
Home equity credit line	—		—		1		—		—		—		1
1-4 family residential	—		—		1		—		1		8		10
Total consumer loans	—		—		2		—		1		8		11
Total nonaccruing	4		8		3		4		18		53		90
Total	$	10	$	19	$	17	$	5	$	36	$	117	$	204

¹ Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

	December 31, 2017
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	2	$	—	$	—	$	12	$	33	$	47
Owner-occupied	1		1		—		—		7		14		23
Total commercial	1		3		—		—		19		47		70
Commercial real estate:
Construction and land development	—		—		—		—		—		2		2
Term	6		—		—		1		—		7		14
Total commercial real estate	6		—		—		1		—		9		16
Consumer:
Home equity credit line	—		2		9		—		1		3		15
1-4 family residential	1		—		6		1		2		26		36
Construction and other consumer real estate	—		1		—		—		—		1		2
Total consumer loans	1		3		15		1		3		30		53
Total accruing	8		6		15		2		22		86		139
Nonaccruing
Commercial:
Commercial and industrial	—		3		5		2		28		24		62
Owner-occupied	1		2		—		1		1		5		10
Municipal	—		1		—		—		—		—		1
Total commercial	1		6		5		3		29		29		73
Commercial real estate:
Term	2		—		—		—		—		3		5
Total commercial real estate	2		—		—		—		—		3		5
Consumer:
Home equity credit line	—		—		1		—		—		—		1
1-4 family residential	—		—		2		—		1		5		8
Total consumer loans	—		—		3		—		1		5		9
Total nonaccruing	3		6		8		3		30		37		87
Total	$	11	$	12	$	23	$	5	$	52	$	123	$	226

¹  Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

Unfunded lending commitments on TDRs amounted to approximately $5 million at September 30, 2018 and $22 million at December 31, 2017.

The total recorded investment of all TDRs in which interest rates were modified below market was $90 million at September 30, 2018 and $120 million at December 31, 2017. These loans are included in the previous schedule in the columns for interest rate below market and multiple modification types.

The net financial impact on interest income due to interest rate modifications below market for accruing TDRs for the three and nine months endedSeptember 30, 2018 and 2017 was not significant.

On an ongoing basis, we monitor the performance of all TDRs according to their restructured terms. Subsequent payment default is defined in terms of delinquency, when principal or interest payments are past due 90 days or more for commercial loans, or 60 days or more for consumer loans.

The recorded investment of accruing and nonaccruing TDRs that had a payment default during the period listed below (and are still in default at period end) and are within 12 months or less of being modified as TDRs is as follows:

	Three Months Ended September 30, 2018						Nine Months Ended September 30, 2018
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing		Total
Commercial:
Commercial and industrial	$	—	$	1	$	1	$	—	$	5	$	5
Owner-occupied	—		—		—		—		1		1
Total commercial	—		1		1		—		6		6
Commercial real estate:
Term	2		—		2		2		—		2
Total commercial real estate	2		—		2		2		—		2
Total	$	2	$	1	$	3	$	2	$	6	$	8

	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing		Total
Commercial:
Commercial and industrial	$	—	$	1	$	1	$	—	$	1	$	1
Owner-occupied	—		—		—		—		1		1
Total commercial	—		1		1		—		2		2
Total	$	—	$	1	$	1	$	—	$	2	$	2

Note: Total loans modified as TDRs during the 12 months previous to September 30, 2018 and 2017 were $99 millionand $84 million, respectively.

At September 30, 2018 and December 31, 2017, the amount of foreclosed residential real estate property held by the Bank was approximately $2 million and less than $1 million, and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure was approximately $10 million for both periods, respectively.

Concentrations of Credit Risk

Credit risk is the possibility of loss from the failure of a borrower, guarantor, or another obligor to fully perform under the terms of a credit-related contract. We perform an ongoing analysis of our loan portfolio to evaluate whether there is any significant exposure to any concentrations of credit risk. See Note 6 of our 2017 Annual Report on Form 10-K for further discussion of our evaluation of credit risk concentrations. See also Note 7 of our 2017 Annual Report on Form 10-K for a discussion of counterparty risk associated with the Bank’s derivative transactions.

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Derivative Instruments And Hedging Activities

9 Months Ended

Sep. 30, 2018

Summary of Derivative Instruments [Abstract]

Derivative Instruments And Hedging Activities

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Objectives and Accounting

The Bank is exposed to certain risk arising from both its business operations and economic conditions. Our objectives in using derivatives are to add stability to interest income or expense, to modify the duration of specific assets or liabilities as we consider advisable, to manage exposure to interest rate movements or other identified risks, and/or to directly offset derivatives sold to our customers. For a detailed discussion of the use of and accounting policies regarding derivative instruments, see Note 7 of our 2017 Annual Report on Form 10-K.

Collateral and Credit Risk

Exposure to credit risk arises from the possibility of nonperformance by counterparties. No significant losses on derivative instruments have occurred as a result of counterparty nonperformance. For a more detailed discussion of collateral and credit risk related to our derivative contracts, see Note 7 of our 2017 Annual Report on Form 10-K.

Our derivative contracts require us to pledge collateral for derivatives that are in a net liability position at a given balance sheet date. Certain of these derivative contracts contain credit-risk-related contingent features that include the requirement to maintain a minimum debt credit rating. We may be required to pledge additional collateral if a credit-risk-related feature were triggered, such as a downgrade of our credit rating. However, in past situations, not all counterparties have demanded that additional collateral be pledged when provided for by the contractual terms. At September 30, 2018, the fair value of our derivative liabilities was $76 million, for which we were required to pledge cash collateral of approximately $38 million in the normal course of business. If our credit rating were downgraded one notch by either Standard & Poor’s or Moody’s at September 30, 2018, there would likely be no additional collateral required to be pledged. As a result of the Dodd-Frank Act, all newly eligible derivatives entered into are cleared through a central clearinghouse. Derivatives that are centrally cleared do not have credit-risk-related features that require additional collateral if our credit rating were downgraded.

Derivative Amounts

Selected information with respect to notional amounts and recorded gross fair values at September 30, 2018 and December 31, 2017, and the related gain (loss) of derivative instruments for the three and nine months endedSeptember 30, 2018 and 2017 is summarized as follows:

	September 30, 2018						December 31, 2017
	Notional amount		Fair value				Notional amount		Fair value
(In millions)			Other assets		Other liabilities				Other assets		Other liabilities
Derivatives designated as hedging instruments:
Cash flow hedges:
Interest rate swaps	$	713	$	—	$	—	$	1,138	$	—	$	—
Fair value hedges:
Interest rate swaps	500		—		—		—		—		—
Total derivatives designated as hedging instruments	1,213		—		—		1,138		—		—
Derivatives not designated as hedging instruments:
Interest rate swaps and forwards	237		1		—		223		1		—
Interest rate swaps for customers 1	5,345		18		73		4,550		28		33
Foreign exchange	324		4		3		913		9		7
Total derivatives not designated as hedging instruments	5,906		23		76		5,686		38		40
Total derivatives	$	7,119	$	23	$	76	$	6,824	$	38	$	40

¹ Notional amounts include both the customer swaps and the offsetting derivative contracts.

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2018										Nine Months Ended September 30, 2018
(In millions)	OCI			Reclassified from AOCI to interest income			Noninterest income (expense)		Offset to interest expense		OCI			Reclassified from AOCI to interest income			Noninterest income (expense)		Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	(1	)	$	(1	)					$	(8	)	$	(3	)
Derivatives not designated as hedging instruments:
Interest rate swaps for customers							$	8									$	12
Foreign exchange							6										13
Total derivatives	$	(1	)	$	(1	)	$	14	$	—	$	(8	)	$	(3	)	$	25	$	—

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2017								Nine Months Ended September 30, 2017
(In millions)	OCI		Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense		OCI		Reclassified from AOCI to interest income		Noninterest income (expense)			Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	—	$	—					$	—	$	3
Derivatives not designated as hedging instruments:
Interest rate swaps and forward contracts					$	—							$	(1	)
Interest rate swaps for customers					4								8
Foreign exchange					4								12
Total derivatives	$	—	$	—	$	8	$	—	$	—	$	3	$	19		$	—

Note: These schedules are not intended to present at any given time the Bank’s long/short position with respect to its derivative contracts.

¹  Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2018, we estimate that $(6) million will be reclassified from AOCI into interest income

The following schedule presents derivatives used in fair value hedge accounting relationships, as well as pre-tax gains/(losses) recorded on such derivatives and the related hedged items for the periods presented.

	Gain/(loss) recorded in income
	Three Months Ended September 30, 2018							Three Months Ended September 30, 2017
(In millions)	Derivatives		Hedged items			Total income statement impact		Derivatives		Hedged items		Total income statement impact
Interest rate swaps1	$	1	$	(1	)	$	—	$	—	$	—	$	—

	Gain/(loss) recorded in income
	Nine Months Ended September 30, 2018							Nine Months Ended September 30, 2017
(In millions)	Derivatives		Hedged items			Total income statement impact		Derivatives		Hedged items		Total income statement impact
Interest rate swaps1	$	1	$	(1	)	$	—	$	—	$	—	$	—

¹  Consists of hedges of benchmark interest rate risk of fixed-rate long-term debt. Gains and losses were recorded in net interest income.

The following schedule provides selected information regarding the long-term debt in the statement of financial position in which the hedged item is included.

	Carrying amount of the hedged assets/(liabilities)					Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)
(In millions)	2018			2017		2018		2017
Long-term debt	$	(499	)	$	—	$	1	$	—

The fair value of derivative assets was reduced by a net credit valuation adjustment of $1 million and $4 million at September 30, 2018 and 2017, respectively. The adjustment for derivative liabilities was a decrease of $2 million and $1 million at September 30, 2018 and 2017, respectively. These adjustments are required to reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk.

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Debt And Shareholders' Equity

9 Months Ended

Sep. 30, 2018

Capitalization, Long-term Debt and Equity [Abstract]

Debt And Shareholders' Equity

LONG-TERM DEBT AND SHAREHOLDERS’ EQUITY

Long-Term Debt

Long-term debt is summarized as follows:

(In millions)	September 30, 2018		December 31, 2017
Subordinated notes	$	247	$	247
Senior notes	632		135
Capital lease obligations	—		1
Total	$	879	$	383

The preceding carrying values represent the par value of the debt adjusted for any unamortized premium or discount or unamortized debt issuance costs as well as valuation adjustments for fair value swaps. During the third quarter of 2018, the Bank issued a $500 million senior note with an interest rate of 3.5% and a maturity date of August 27, 2021. The Bank intends to call, on the November 15, 2018 call date, $162 million of subordinated notes that mature on November 15, 2023.

Common Stock

On September 30, 2018, the Bank completed the merger of Zions Bancorporation, its former bank holding company, with, and into its subsidiary bank, formerly known as ZB, N.A. As a result of this merger, the Bank’s common stock now has a 0.001 par value, and is $192,169 at September 30, 2018.

Repurchases of Bank Common Stock

During the third quarter of 2018, we continued our common stock buyback program and repurchased 3.5 million shares of common stock outstanding with a fair value of $185 million at an average price of $52.86 per share. During the first nine months of 2018, we repurchased 7.8 million common shares outstanding with a fair value of $420 million at an average price of $53.84 per share. During the first nine months of 2017, we repurchased 4.7 million shares of common stock outstanding with a fair value of $205 million, at an average price of $43.72 per share. In October 2018, the Bank announced that the Board approved a plan to repurchase $250 million of common stock during the fourth quarter of 2018 and subsequently began the repurchases.

Common Stock Warrants

During the first nine months of 2018, 1.3 million shares of common stock were issued from the cashless exercise of 3.9 million common stock ZIONZ warrants. As of September 30, 2018, 1.9 million common stock ZIONZ warrants with an exercise price of $36.27 per share, were outstanding. These warrants expire on November 14, 2018 and were associated with the preferred stock issued under the Troubled Asset Relief Program, which was redeemed in 2012. Additionally, as of September 30, 2018, 29.3 million common stock ZIONW warrants, with an exercise price of $35.03, were outstanding. These warrants expire on May 22, 2020.

Accumulated Other Comprehensive Income

Accumulated other comprehensive income (loss) was $(361) million at September 30, 2018 compared with $(139) million at December 31, 2017. Changes in AOCI by component are as follows:

(In millions)	Net unrealized gains (losses) on investment securities			Net unrealized gains (losses) on derivatives and other			Pension and post-retirement			Total
Nine Months Ended September 30, 2018
Balance at December 31, 2017	$	(114	)	$	(2	)	$	(23	)	$	(139	)
OCI (loss) before reclassifications, net of tax	(221		)	(3		)	—			(224		)
Amounts reclassified from AOCI, net of tax	—			2			—			2
OCI (loss)	(221		)	(1		)	—			(222		)
Balance at September 30, 2018	$	(335	)	$	(3	)	$	(23	)	$	(361	)
Income tax benefit included in OCI (loss)	$	(73	)	$	—		$	—		$	(73	)
Nine Months Ended September 30, 2017
Balance at December 31, 2016	$	(93	)	$	2		$	(31	)	$	(122	)
OCI before reclassifications, net of tax	65			2			—			67
Amounts reclassified from AOCI, net of tax	—			(2		)	—			(2		)
OCI	65			—			—			65
Balance at September 30, 2017	$	(28	)	$	2		$	(31	)	$	(57	)
Income tax expense included in OCI	$	40		$	—		$	—		$	40

	Amounts reclassified from AOCI 1					Amounts reclassified from AOCI 1					Statement of income (SI) Balance sheet (BS)
(In millions)	Three Months Ended September 30,					Nine Months Ended September 30,
Details about AOCI components	2018			2017		2018			2017			Affected line item
Net unrealized gains on derivative instruments	$	(1	)	$	—	$	(3	)	$	3	SI	Interest and fees on loans
Income tax expense	—			—		(1		)	1
Amounts Reclassified from AOCI	$	(1	)	$	—	$	(2	)	$	2

¹  Positive reclassification amounts indicate increases to earnings in the statement of income and decreases to balance sheet assets.

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Commitments, Guarantees, And Contingent Liabilities

9 Months Ended

Sep. 30, 2018

Guarantees, Commitments And Contingencies [Abstract]

Guarantees, Commitments And Contingencies

COMMITMENTS, GUARANTEES AND CONTINGENT LIABILITIES

Commitments and Guarantees

Contractual amounts of off-balance sheet financial instruments used to meet the financing needs of our customers are as follows:

(In millions)	September 30, 2018		December 31, 2017
Net unfunded commitments to extend credit 1	$	20,999	$	19,583
Standby letters of credit:
Financial	673		721
Performance	196		196
Commercial letters of credit	20		31
Total unfunded lending commitments	$	21,888	$	20,531

¹  Net of participations

The Bank’s 2017 Annual Report on Form 10-K contains further information about these commitments and guarantees including their terms and collateral requirements. At September 30, 2018, the Bank had recorded approximately $5 million as a liability for the guarantees associated with the standby letters of credit, which consisted of $1 million attributable to the RULC and $4 million of deferred commitment fees.

At September 30, 2018, we had unfunded commitments for PEIs of approximately $31 million. These obligations have no stated maturity. PEIs related to these commitments that are prohibited by the Volcker Rule were $2 million at September 30, 2018. See related discussions about these investments in Note 5.

Legal Matters

We are subject to litigation in court and arbitral proceedings, as well as proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies. Litigation may relate to lending, deposit and other customer relationships, vendor and contractual issues, employee matters, intellectual property matters, personal injuries and torts, regulatory and legal compliance, and other matters. While most matters relate to individual claims, we are also subject to putative class action claims and similar broader claims. Proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies may relate to our banking, investment advisory, trust, securities, and other products and services; our customers’ involvement in money laundering, fraud, securities violations and other illicit activities or our policies and practices relating to such customer activities; and our compliance with the broad range of banking, securities and other laws and regulations applicable to us. At any given time, we may be in the process of responding to subpoenas, requests for documents, data and testimony relating to such matters and engaging in discussions to resolve the matters.

As of September 30, 2018, we were subject to the following material litigation or governmental inquiries:

• a civil suit, Shou-En Wang v. CB&T, brought against us in the Superior Court for Los Angeles County, Central District in April 2016. The case relates to our depositor relationships with customers who were promoters of an investment program that allegedly misappropriated investors’ funds. This case is in an early phase, with initial motion practice and discovery having been completed, with additional motion practice and expert witness phases being underway.

• a civil suit, McFarland as Trustee for International Manufacturing Group v. CB&T, et. al., brought against us in the United States Bankruptcy Court for the Eastern District of California in May 2016. The Trustee seeks to recover loan payments previously repaid to us by our customer, International Manufacturing Group (“IMG”), alleging that IMG, along with its principal, obtained loans and made loan repayments in furtherance of an alleged Ponzi scheme. Initial motion practice has been completed and discovery is underway.

• a civil suit, JTS Communities, Inc. et. al v. CB&T, Jun Enkoji and Dawn Satow, brought against us in the Superior Court for Sacramento County, California in June 2017. In this case four investors in IMG seek to hold us liable for losses arising from their investments in that company, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi scheme. This case is in an early phase with initial motion practice having been completed and discovery is underway.

• a civil class action lawsuit, Evans v. CB&T, brought against us in the United States District Court for the Eastern District of California in May 2017. This case was filed on behalf of a class of up to 50 investors in IMG and seeks to hold us liable for losses of class members arising from their investments in IMG, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi scheme. In December 2017, the District Court dismissed all claims against the Bank. In January 2018, the plaintiff filed an appeal with the Court of Appeals for the Ninth Circuit. The appellate briefing process has been completed with a ruling anticipated in 2019.

• a Private Attorney General Act (“PAGA”) claim under California law, Lawson v. CB&T, brought against us in the Superior Court for the County of San Diego, California, in February 2016. In this case, the plaintiff alleges, on behalf of herself and other current or former employees of the Bank who worked in California on a non-exempt basis, violations by the Bank of California wage and hour laws. The case remains in the early stages of motion practice, to date mainly involving questions of venue and scope of employees covered by the PAGA claims. In March 2018, the Supreme Court of California granted review of an appeal from the intermediate appellate court decision requiring all aspects of the case to be heard in state court, rather than in arbitration. The appellate briefing process has been completed with a ruling anticipated in 2019.

• a civil case, Lifescan Inc. and Johnson & Johnson Health Care Services v. Jeffrey Smith, et al., brought against us in the United States District Court for the District of New Jersey in December 2017. In this case, certain manufacturers and distributors of medical products seek to hold us liable for allegedly fraudulent practices of a borrower of the Bank which filed for bankruptcy protection in 2017. The case is in early phase, with initial motion practice and discovery underway.

At least quarterly, we review outstanding and new legal matters, utilizing then available information. In accordance with applicable accounting guidance, if we determine that a loss from a matter is probable and the amount of the loss can be reasonably estimated, we establish an accrual for the loss. In the absence of such a determination, no accrual is made. Once established, accruals are adjusted to reflect developments relating to the matters.

In our review, we also assess whether we can determine the range of reasonably possible losses for significant matters in which we are unable to determine that the likelihood of a loss is remote. Because of the difficulty of predicting the outcome of legal matters, discussed subsequently, we are able to meaningfully estimate such a range only for a limited number of matters. Based on information available as of September 30, 2018, we estimated that the aggregate range of reasonably possible losses for those matters to be from $0 millionto roughly $15 million in excess of amounts accrued. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from this estimate. Those matters for which a meaningful estimate is not possible are not included within this estimated range and, therefore, this estimated range does not represent our maximum loss exposure.

Based on our current knowledge, we believe that our current estimated liability for litigation and other legal actions and claims, reflected in our accruals and determined in accordance with applicable accounting guidance, is adequate and that liabilities in excess of the amounts currently accrued, if any, arising from litigation and other legal actions and claims for which an estimate as previously described is possible, will not have a material impact on our financial condition, results of operations, or cash flows. However, in light of the significant uncertainties involved in these matters, and the very large or indeterminate damages sought in some of these matters, an adverse outcome in one or more of these matters could be material to our financial condition, results of operations, or cash flows for any given reporting period.

Any estimate or determination relating to the future resolution of litigation, arbitration, governmental or self-regulatory examinations, investigations or actions or similar matters is inherently uncertain and involves significant judgment. This is particularly true in the early stages of a legal matter, when legal issues and facts have not been well articulated, reviewed, analyzed, and vetted through discovery, preparation for trial or hearings, substantive and productive mediation or settlement discussions, or other actions. It is also particularly true with respect to class action and similar claims involving multiple defendants, matters with complex procedural requirements or substantive issues or novel legal theories, and examinations, investigations and other actions conducted or brought by governmental and self-regulatory agencies, in which the normal adjudicative process is not applicable. Accordingly, we usually are unable to determine whether a favorable or unfavorable outcome is remote, reasonably likely, or probable, or to estimate the amount or range of a probable or reasonably likely loss, until relatively late in the course of a legal matter, sometimes not until a number of years have elapsed. Accordingly, our judgments and estimates relating to claims will change from time to time in light of developments and actual outcomes will differ from our estimates. These differences may be material.

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Retirement Plans

9 Months Ended

Sep. 30, 2018

Defined Benefit Plan [Abstract]

Retirement Plans

RETIREMENT PLANS

The following discloses the net periodic benefit cost (credit) and its components for the Bank’s pension and other retirement plans:

(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Interest cost	$	1		$	2		$	4		$	5
Expected return on plan assets	(3		)	(3		)	(9		)	(9		)
Partial settlement loss	1			1			2			2
Amortization of net actuarial loss	—			1			1			4
Net periodic benefit cost (benefit)	$	(1	)	$	1		$	(2	)	$	2

As disclosed in our 2017 Annual Report on Form 10-K, the Bank has frozen its participation and benefit accruals for the pension plan and its contributions for individual benefit payments in the postretirement benefit plan. In October 2018, the Bank has decided to terminate its pension plan subject to obtaining necessary regulatory approval. Completion of this termination is expected in early 2020. Plan participant benefits will not be disadvantaged because of this decision.

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Income Taxes

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

The effective income tax rate of 23.6% for the third quarter of 2018 was lower than the 2017third quarter rate of 34.2%. The effective tax rates for the first nine months of 2018 and 2017 were 22.9% and 30.6%, respectively. The tax rates for 2018 and 2017 were reduced by nontaxable municipal interest income and nontaxable income from certain bank-owned life insurance. The income tax rate for 2018 was positively impacted by the decrease in the corporate federal income tax rate to 21% from 35% due to the Tax Cuts and Jobs Act, which was effective January 1, 2018. This rate benefit was partially reduced by the non-deductibility of Federal Deposit Insurance Corporation (“FDIC”) premiums, certain executive compensation and other fringe benefits as enacted by the new tax law. The tax rate for 2017 was also impacted by a one-time $14 million benefit to tax expense related to state tax adjustments and a one-time $4 million benefit due to changes in the carrying value of various state deferred tax items.

We had a net deferred tax asset (“DTA”) balance of $170 million at September 30, 2018, compared with $93 million at December 31, 2017. The increase in the net DTA resulted primarily from the increase of accrued compensation and unrealized losses in OCI related to securities, and the decrease in deferred tax liabilities related to the deferred gain on a prior period debt exchange. Net charge-offs exceeding the provision for loan losses and an increase in deferred loan fees offset some of the overall increase in DTA.

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Net Earnings per Common Share (Notes)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

NET EARNINGS PER COMMON SHARE

Basic and diluted net earnings per common share based on the weighted average outstanding shares are summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except shares and per share amounts)	2018		2017		2018		2017
Basic:
Net income	$	223	$	160	$	658	$	469
Less common and preferred dividends	66		32		170		89
Undistributed earnings	157		128		488		380
Less undistributed earnings applicable to nonvested shares	1		1		4		4
Undistributed earnings applicable to common shares	156		127		484		376
Distributed earnings applicable to common shares	58		24		144		56
Total earnings applicable to common shares	$	214	$	151	$	628	$	432
Weighted average common shares outstanding (in thousands)	192,973		200,332		195,079		201,493
Net earnings per common share	$	1.11	$	0.75	$	3.22	$	2.14
Diluted:
Total earnings applicable to common shares	$	214	$	151	$	628	$	432
Weighted average common shares outstanding (in thousands)	192,973		200,332		195,079		201,493
Dilutive effect of common stock warrants (in thousands)	11,880		7,729		12,555		6,783
Dilutive effect of stock options (in thousands)	912		1,045		1,023		1,090
Weighted average diluted common shares outstanding (in thousands)	205,765		209,106		208,657		209,366
Net earnings per common share	$	1.04	$	0.72	$	3.01	$	2.06

The following schedule presents the weighted average shares of stock awards that were anti-dilutive and not included in the calculation of diluted earnings per share.

	Three Months Ended September 30,		Nine Months Ended September 30,
(In thousands)	2018	2017	2018	2017
Restricted stock and restricted stock units	1,490	1,779	1,651	1,997

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Operating Segment Information

9 Months Ended

Sep. 30, 2018

Operating Segment Information [Abstract]

Operating Segment Information

OPERATING SEGMENT INFORMATION

We manage our operations and prepare management reports and other information with a primary focus on geographical area. Our banking operations are managed under their own individual brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. Performance assessment and resource allocation are based upon this geographical structure. We use an internal funds transfer pricing (“FTP”) allocation system to report results of operations for business segments. This process continues to be refined. Prior period amounts have been reclassified to reflect these changes. Total average loans and deposits presented for the banking segments do not include intercompany amounts between banking segments, but may include deposits with the Other segment.

As of September 30, 2018, our banking business is conducted through 7 locally managed and branded segments in distinct geographical areas. Zions Bank operates 97 branches in Utah, 23 branches in Idaho, and one branch in Wyoming. Amegy operates 73 branches in Texas. CB&T operates 90 branches in California. NBAZ operates 58 branches in Arizona. NSB operates 50 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates one branch in Washington and one branch in Oregon.

The operating segment identified as “Other” includes certain nonbank financial service subsidiaries, centralized back-office functions, and eliminations of transactions between segments. The major components of net interest income at the Bank’s back-office include the revenue associated with the investments securities portfolio and the offset of the FTP costs and benefits provided to the business segments.

The following schedule does not present total assets or income tax expense for each operating segment, but instead presents average loans, average deposits and income before income taxes because these are the metrics that management uses when evaluating performance and making decisions pertaining to the operating segments. The Bank’s net interest income includes interest expense on borrowed funds. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment.

The accounting policies of the individual operating segments are the same as those of the Bank. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations.

The following schedule presents selected operating segment information for the three months ended September 30, 2018 and 2017:

(In millions)	Zions Bank					Amegy					CB&T
	2018		2017			2018			2017		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	177	$	165		$	133		$	122	$	138	$	120
Provision for loan losses	2		(15		)	(16		)	33		3		(4		)
Net interest income after provision for loan losses	175		180			149			89		135		124
Noninterest income	38		39			31			28		19		20
Noninterest expense	118		107			84			86		77		74
Income (loss) before income taxes	$	95	$	112		$	96		$	31	$	77	$	70
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	12,607	$	12,543		$	11,328		$	11,170	$	9,985	$	9,575
Total average deposits	15,845		15,773			11,185			10,862		11,335		11,021

(In millions)	NBAZ						NSB					Vectra
	2018			2017			2018		2017			2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	59		$	53		$	38	$	33		$	35	$	32
Provision for loan losses	(1		)	(8		)	—		(3		)	1		—
Net interest income after provision for loan losses	60			61			38		36			34		32
Noninterest income	10			10			10		11			6		7
Noninterest expense	39			38			35		35			26		25
Income (loss) before income taxes	$	31		$	33		$	13	$	12		$	14	$	14
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	4,591		$	4,267		$	2,408	$	2,347		$	2,969	$	2,683
Total average deposits	5,008			4,816			4,302		4,276			2,789		2,757

(In millions)	TCBW				Other						Consolidated Bank
	2018		2017		2018			2017			2018			2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	14	$	12	$	(29	)	$	(15	)	$	565		$	522
Provision for loan losses	—		3		—			(1		)	(11		)	5
Net interest income after provision for loan losses	14		9		(29		)	(14		)	576			517
Noninterest income	1		1		21			23			136			139
Noninterest expense	6		5		35			43			420			413
Income (loss) before income taxes	$	9	$	5	$	(43	)	$	(34	)	$	292		$	243
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	1,136	$	939	$	344		$	308		$	45,368		$	43,832
Total average deposits	1,086		1,098		2,025			1,318			53,575			51,921

The following schedule presents selected operating segment information for the nine months ended September 30, 2018 and 2017:

(In millions)	Zions Bank				Amegy					CB&T
	2018		2017		2018			2017		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	516	$	475	$	385		$	360	$	399	$	355
Provision for loan losses	3		18		(72		)	41		7		(10		)
Net interest income after provision for loan losses	513		457		457			319		392		365
Noninterest income	111		112		95			87		59		56
Noninterest expense	350		327		254			259		231		225
Income (loss) before income taxes	$	274	$	242	$	298		$	147	$	220	$	196
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	12,565	$	12,505	$	11,362		$	10,890	$	9,941	$	9,453
Total average deposits	15,847		16,001		11,022			11,131		11,213		10,953

(In millions)	NBAZ					NSB					Vectra
	2018		2017			2018		2017			2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	170	$	152		$	111	$	96		$	101	$	94
Provision for loan losses	8		(7		)	—		(8		)	5		—
Net interest income after provision for loan losses	162		159			111		104			96		94
Noninterest income	29		29			30		30			18		19
Noninterest expense	115		111			108		105			79		75
Income (loss) before income taxes	$	76	$	77		$	33	$	29		$	35	$	38
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	4,591	$	4,258		$	2,369	$	2,352		$	2,882	$	2,607
Total average deposits	4,912		4,747			4,280		4,240			2,762		2,758

(In millions)	TCBW				Other						Consolidated Bank
	2018		2017		2018			2017			2018			2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	38	$	34	$	(66	)	$	(27	)	$	1,654		$	1,539
Provision for loan losses	2		2		1			(1		)	(46		)	35
Net interest income after provision for loan losses	36		32		(67		)	(26		)	1,700			1,504
Noninterest income	4		3		66			68			412			404
Noninterest expense	16		16		106			114			1,259			1,232
Income (loss) before income taxes	$	24	$	19	$	(107	)	$	(72	)	$	853		$	676
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	1,113	$	909	$	336		$	244		$	45,159		$	43,218
Total average deposits	1,069		1,098		1,722			1,227			52,827			52,155

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Basis of Presentaion Organization and Presentation (Policies)

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

BASIS OF PRESENTATION

The accompanying unaudited consolidated financial statements of Zions Bancorporation, National Association and its majority-owned subsidiaries (collectively “Zions Bancorporation, N.A.,” “the Bank,” “we,” “our,” “us”) have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board, are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force.

Operating results for the nine months endedSeptember 30, 2018 and 2017 are not necessarily indicative of the results that may be expected in future periods. In preparing the consolidated financial statements, we are required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The consolidated balance sheet at December 31, 2017 is from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Bank’s 2017 Annual Report on Form 10-K. Certain prior period amounts have been reclassified to conform with the current period presentation. These reclassifications did not affect net income or shareholders’ equity.

Zions Bancorporation, N.A. is a commercial bank headquartered in Salt Lake City, Utah. The Bank provides a full range of banking and related services in 11 Western and Southwestern states through 7 separately managed and branded units as follows: Zions Bank, in Utah, Idaho and Wyoming; Amegy Bank (“Amegy”), in Texas; California Bank & Trust (“CB&T”); National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“Vectra”), in Colorado and New Mexico; and The Commerce Bank of Washington (“TCBW”) which operates under that name in Washington and under the name The Commerce Bank of Oregon in Oregon.

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Fair Value (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis

(In millions)	September 30, 2018
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	25	$	13,292	$	—	$	13,317
Municipal securities			1,284				1,284
Other debt securities			24				24
Total Available-for-sale	25		14,600		—		14,625
Trading account	119		57				176
Other noninterest-bearing investments:
Bank-owned life insurance			516				516
Private equity investments					103		103
Other assets:
Agriculture loan servicing and interest-only strips					18		18
Deferred compensation plan assets	108						108
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			18				18
Foreign currency exchange contracts	4						4
Total Assets	$	256	$	15,192	$	121	$	15,569
LIABILITIES
Securities sold, not yet purchased	$	49	$	—	$	—	$	49
Other liabilities:
Deferred compensation plan obligations	108						108
Derivatives:
Interest rate swaps for customers			73				73
Foreign currency exchange contracts	3						3
Total Liabilities	$	160	$	73	$	—	$	233

¹We used a third-party pricing service to measure fair value for approximately 95% of our AFS Level 2 securities.

(In millions)	December 31, 2017
	Level 1		Level 2		Level 3		Total
ASSETS
Investment securities:
Available-for-sale: 1
U.S. Treasury, agencies and corporations	$	25	$	13,706	$	—	$	13,731
Municipal securities			1,334				1,334
Other debt securities			24				24
Money market mutual funds and other	71		1				72
Total Available-for-sale	96		15,065		—		15,161
Trading account			148				148
Other noninterest-bearing investments:
Bank-owned life insurance			507				507
Private equity investments					95		95
Other assets:
Agriculture loan servicing and interest-only strips					18		18
Deferred compensation plan assets	102						102
Derivatives:
Interest rate swaps and forwards			1				1
Interest rate swaps for customers			28				28
Foreign currency exchange contracts	9						9
Total Assets	$	207	$	15,749	$	113	$	16,069
LIABILITIES
Securities sold, not yet purchased	$	95	$	—	$	—	$	95
Other liabilities:
Deferred compensation plan obligations	102						102
Derivatives:
Interest rate swaps for customers			33				33
Foreign currency exchange contracts	7						7
Total Liabilities	$	204	$	33	$	—	$	237

¹We used a third-party pricing service to measure fair value for approximately 92% of our AFS Level 2 securities.

Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs

	Level 3 Instruments
	Three Months Ended									Nine Months Ended
	September 30, 2018					September 30, 2017				September 30, 2018				September 30, 2017
(In millions)	Private equity investments			Ag loan svcg and int-only strips		Private equity investments		Ag loan svcg and int-only strips		Private equity investments		Ag loan svcg and int-only strips		Private equity investments			Ag loan svcg and int-only strips
Balance at beginning of period	$	102		$	18	$	82	$	19	$	95	$	18	$	73		$	20
Securities gains (losses), net	(1		)	—		5		—		—		—		7			—
Other noninterest income	—			—		—		—		—		—		—			(1		)
Purchases	2			—		6		—		8		—		18			—
Redemptions and paydowns	—			—		—		—		—		—		(5		)	—
Balance at end of period	$	103		$	18	$	93	$	19	$	103	$	18	$	93		$	19

Schedule Of Realized Gains (Losses) Using Level 3 Inputs

(In millions)	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018			2017
Securities gains (losses), net	$	—	$	—	$	(3	)	$	3

Schedule Of Assets With Fair Value Changes On Nonrecurring Basis

(In millions)	Fair value at September 30, 2018								Fair value at December 31, 2017
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS
Private equity investments	$	—	$	—	$	—	$	—	$	—	$	—	$	1	$	1
Impaired loans	—		23		—		23		—		9		—		9
Other real estate owned	—		1		—		1		—		—		—		—
Total	$	—	$	24	$	—	$	24	$	—	$	9	$	1	$	10

The previous fair values may not be current as of the dates indicated, but rather as of the date the fair value change occurred, such as a charge for impairment. Accordingly, carrying values may not equal current fair value.

	Gains (losses) from fair value changes
(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
ASSETS
Private equity investments	$	—		$	—		$	—		$	(1	)
Impaired loans	(9		)	(1		)	(15		)	(8		)
Other real estate owned	—			—			(1		)	—
Total	$	(9	)	$	(1	)	$	(16	)	$	(9	)

Fair Value, by Balance Sheet Grouping [Table Text Block]

	September 30, 2018					December 31, 2017
(In millions)	Carrying value		Estimated fair value		Level	Carrying value		Estimated fair value		Level
Financial assets:
HTM investment securities	$	751	$	734	2	$	770	$	762	2
Loans and leases (including loans held for sale), net of allowance	45,391		44,452		3	44,306		44,226		3
Financial liabilities:
Time deposits	4,256		4,231		2	3,115		3,099		2
Other short-term borrowings	2,900		2,900		2	3,600		3,600		2
Long-term debt	879		885		2	383		402		2

	September 30, 2018
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	781	$	(221	)	$	560	$	—		$	—		$	560
Derivatives (included in other assets)	23		—			23		(13		)	(8		)	2
Total assets	$	804	$	(221	)	$	583	$	(13	)	$	(8	)	$	562
Liabilities:
Federal funds and other short-term borrowings	$	4,001	$	(221	)	$	3,780	$	—		$	—		$	3,780
Derivatives (included in other liabilities)	76		—			76		(13		)	—			63
Total Liabilities	$	4,077	$	(221	)	$	3,856	$	(13	)	$	—		$	3,843

	December 31, 2017
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	809	$	(295	)	$	514	$	—		$	—		$	514
Derivatives (included in other assets)	38		—			38		(9		)	(1		)	28
Total assets	$	847	$	(295	)	$	552	$	(9	)	$	(1	)	$	542
Liabilities:
Federal funds and other short-term borrowings	$	5,271	$	(295	)	$	4,976	$	—		$	—		$	4,976
Derivatives (included in other liabilities)	40		—			40		(9		)	(6		)	25
Total Liabilities	$	5,311	$	(295	)	$	5,016	$	(9	)	$	(6	)	$	5,001

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Offsetting Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2018

Offsetting Assets and Liabilities [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

	September 30, 2018					December 31, 2017
(In millions)	Carrying value		Estimated fair value		Level	Carrying value		Estimated fair value		Level
Financial assets:
HTM investment securities	$	751	$	734	2	$	770	$	762	2
Loans and leases (including loans held for sale), net of allowance	45,391		44,452		3	44,306		44,226		3
Financial liabilities:
Time deposits	4,256		4,231		2	3,115		3,099		2
Other short-term borrowings	2,900		2,900		2	3,600		3,600		2
Long-term debt	879		885		2	383		402		2

	September 30, 2018
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	781	$	(221	)	$	560	$	—		$	—		$	560
Derivatives (included in other assets)	23		—			23		(13		)	(8		)	2
Total assets	$	804	$	(221	)	$	583	$	(13	)	$	(8	)	$	562
Liabilities:
Federal funds and other short-term borrowings	$	4,001	$	(221	)	$	3,780	$	—		$	—		$	3,780
Derivatives (included in other liabilities)	76		—			76		(13		)	—			63
Total Liabilities	$	4,077	$	(221	)	$	3,856	$	(13	)	$	—		$	3,843

	December 31, 2017
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	809	$	(295	)	$	514	$	—		$	—		$	514
Derivatives (included in other assets)	38		—			38		(9		)	(1		)	28
Total assets	$	847	$	(295	)	$	552	$	(9	)	$	(1	)	$	542
Liabilities:
Federal funds and other short-term borrowings	$	5,271	$	(295	)	$	4,976	$	—		$	—		$	4,976
Derivatives (included in other liabilities)	40		—			40		(9		)	(6		)	25
Total Liabilities	$	5,311	$	(295	)	$	5,016	$	(9	)	$	(6	)	$	5,001

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Investment Securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments [Abstract]

Summary Of Investment Securities

	September 30, 2018
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	751	$	4	$	21	$	734
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,480		—		32		1,448
Agency guaranteed mortgage-backed securities	10,159		6		341		9,824
Small Business Administration loan-backed securities	2,069		1		50		2,020
Municipal securities	1,313		1		30		1,284
Other debt securities	25		—		1		24
Total available-for-sale	15,071		8		454		14,625
Total investment securities	$	15,822	$	12	$	475	$	15,359

	December 31, 2017
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	770	$	5	$	13	$	762
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,830		1		13		1,818
Agency guaranteed mortgage-backed securities	9,798		9		141		9,666
Small Business Administration loan-backed securities	2,227		10		15		2,222
Municipal securities	1,336		9		11		1,334
Other debt securities	25		—		1		24
Total available-for-sale debt securities	15,241		29		181		15,089
Money market mutual funds and other	72		—		—		72
Total available-for-sale	15,313		29		181		15,161
Total investment securities	$	16,083	$	34	$	194	$	15,923

Contractual Maturities Debt Securities

	September 30, 2018
	Held-to-maturity				Available-for-sale
(In millions)	Amortized cost		Estimated fair value		Amortized cost		Estimated fair value
Due in one year or less	$	201	$	199	$	1,572	$	1,528
Due after one year through five years	356		349		4,874		4,733
Due after five years through ten years	139		135		4,650		4,509
Due after ten years	55		51		3,975		3,855
Total	$	751	$	734	$	15,071	$	14,625

Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value

	September 30, 2018
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	4	$	227	$	17	$	343	$	21	$	570
Available-for-sale
U.S. Treasury securities	—		25		—		—		—		25
U.S. Government agencies and corporations:
Agency securities	20		970		12		354		32		1,324
Agency guaranteed mortgage-backed securities	92		3,821		249		5,354		341		9,175
Small Business Administration loan-backed securities	25		1,414		25		559		50		1,973
Municipal securities	15		834		15		331		30		1,165
Other	—		—		1		14		1		14
Total available-for-sale	152		7,064		302		6,612		454		13,676
Total	$	156	$	7,291	$	319	$	6,955	$	475	$	14,246

	December 31, 2017
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value		Gross unrealized losses		Estimated  fair  value
Held-to-maturity
Municipal securities	$	3	$	263	$	10	$	292	$	13	$	555
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	6		808		7		808		13		1,616
Agency guaranteed mortgage-backed securities	29		3,609		112		4,721		141		8,330
Small Business Administration loan-backed securities	3		408		12		649		15		1,057
Municipal securities	6		554		5		230		11		784
Other	—		—		1		14		1		14
Total available-for-sale	44		5,379		137		6,422		181		11,801
Total	$	47	$	5,642	$	147	$	6,714	$	194	$	12,356

Gains And Losses, Including OTTI, Recognized In Statement Of Income

	Three Months Ended September 30,									Nine Months Ended September 30,
	2018					2017				2018					2017
(In millions)	Gross gains		Gross losses			Gross gains		Gross losses		Gross gains		Gross losses			Gross gains		Gross losses
Investment securities:
Other noninterest-bearing investments	$	4	$	5		$	5	$	—	$	9	$	10		$	20	$	7
Net gains (losses) 1			$	(1	)			$	5			$	(1	)			$	13

Tax and Nontaxable Interest Income by Investment Type [Table Text Block]

	Three Months Ended September 30,
(In millions)	2018						2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	3	$	4	$	7	$	2	$	3	$	5
Available-for-sale	73		6		79		72		6		78
Trading	—		—		—		1		—		1
Total	$	76	$	10	$	86	$	75	$	9	$	84

	Nine Months Ended September 30,
(In millions)	2018						2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	8	$	11	$	19	$	7	$	10	$	17
Available-for-sale	216		19		235		209		18		227
Trading	3		—		3		2		—		2
Total	$	227	$	30	$	257	$	218	$	28	$	246

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Loans And Allowance For Credit Losses (Tables)

9 Months Ended

Sep. 30, 2018

Accounts, Notes, Loans and Financing Receivable [Line Items]

Investment of accuring and nonaccruing troubled debt restructuring [Text Block]

	Three Months Ended September 30, 2018						Nine Months Ended September 30, 2018
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing		Total
Commercial:
Commercial and industrial	$	—	$	1	$	1	$	—	$	5	$	5
Owner-occupied	—		—		—		—		1		1
Total commercial	—		1		1		—		6		6
Commercial real estate:
Term	2		—		2		2		—		2
Total commercial real estate	2		—		2		2		—		2
Total	$	2	$	1	$	3	$	2	$	6	$	8

	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
(In millions)	Accruing		Nonaccruing		Total		Accruing		Nonaccruing		Total
Commercial:
Commercial and industrial	$	—	$	1	$	1	$	—	$	1	$	1
Owner-occupied	—		—		—		—		1		1
Total commercial	—		1		1		—		2		2
Total	$	—	$	1	$	1	$	—	$	2	$	2

Note: Total loans modified as TDRs during the 12 months previous to September 30, 2018 and 2017 were $99 millionand $84 million, respectively.

allowance for loan losses by impairment [Table Text Block]

The ALLL and outstanding loan balances according to the Bank’s impairment method are summarized as follows:
	September 30, 2018
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	10	$	1	$	3	$	14
Collectively evaluated for impairment	304		114		48		466
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	314	$	115	$	51	$	480
Outstanding loan balances:
Individually evaluated for impairment	$	201	$	65	$	74	$	340
Collectively evaluated for impairment	23,338		10,982		11,150		45,470
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	23,539	$	11,047	$	11,224	$	45,810

	December 31, 2017
(In millions)	Commercial		Commercial real estate		Consumer		Total
Allowance for loan losses:
Individually evaluated for impairment	$	26	$	1	$	4	$	31
Collectively evaluated for impairment	345		102		40		487
Purchased loans with evidence of credit deterioration	—		—		—		—
Total	$	371	$	103	$	44	$	518
Outstanding loan balances:
Individually evaluated for impairment	$	314	$	69	$	76	$	459
Collectively evaluated for impairment	22,598		11,048		10,648		44,294
Purchased loans with evidence of credit deterioration	14		7		6		27
Total	$	22,926	$	11,124	$	10,730	$	44,780

Summary Of Major Portfolio Segment And Specific Loan Class

(In millions)	September 30, 2018		December 31, 2017
Loans held for sale	$	61	$	44
Commercial:
Commercial and industrial	$	14,096	$	14,003
Leasing	332		364
Owner-occupied	7,548		7,288
Municipal	1,563		1,271
Total commercial	23,539		22,926
Commercial real estate:
Construction and land development	2,295		2,021
Term	8,752		9,103
Total commercial real estate	11,047		11,124
Consumer:
Home equity credit line	2,884		2,777
1-4 family residential	7,039		6,662
Construction and other consumer real estate	644		597
Bankcard and other revolving plans	483		509
Other	174		185
Total consumer	11,224		10,730
Total loans 1	$	45,810	$	44,780

Summary Of Changes in The Allowance For Credit Losses

Changes in the allowance for credit losses are summarized as follows:
	Three Months Ended September 30, 2018
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	321		$	122		$	47	$	490
Provision for loan losses	(11		)	(5		)	5		(11		)
Gross loan and lease charge-offs	8			5			4		17
Recoveries	12			3			3		18
Net loan and lease charge-offs (recoveries)	(4		)	2			1		(1		)
Balance at end of period	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments
Balance at beginning of period	$	43		$	15		$	—	$	58
Provision for unfunded lending commitments	(1		)	1			—		—
Balance at end of period	$	42		$	16		$	—	$	58
Total allowance for credit losses at end of period
Allowance for loan losses	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments	42			16			—		58
Total allowance for credit losses	$	356		$	131		$	51	$	538

	Nine Months Ended September 30, 2018
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	371		$	103		$	44	$	518
Provision for loan losses	(69		)	9			14		(46		)
Gross loan and lease charge-offs	38			5			13		56
Recoveries	50			8			6		64
Net loan and lease charge-offs (recoveries)	(12		)	(3		)	7		(8		)
Balance at end of period	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments
Balance at beginning of period	$	48		$	10		$	—	$	58
Provision for unfunded lending commitments	(6		)	6			—		—
Balance at end of period	$	42		$	16		$	—	$	58
Total allowance for credit losses at end of period
Allowance for loan losses	$	314		$	115		$	51	$	480
Reserve for unfunded lending commitments	42			16			—		58
Total allowance for credit losses	$	356		$	131		$	51	$	538

	Three Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	393		$	116		$	35	$	544
Provision for loan losses	(4		)	(7		)	16		5
Gross loan and lease charge-offs	16			4			5		25
Recoveries	12			2			3		17
Net loan and lease charge-offs (recoveries)	4			2			2		8
Balance at end of period	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	53		$	10		$	—	$	63
Provision for unfunded lending commitments	(4		)	—			—		(4		)
Balance at end of period	$	49		$	10		$	—	$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments	49			10			—		59
Total allowance for credit losses	$	434		$	117		$	49	$	600

	Nine Months Ended September 30, 2017
(In millions)	Commercial			Commercial real estate			Consumer		Total
Allowance for loan losses
Balance at beginning of period	$	420		$	116		$	31	$	567
Provision for loan losses	27			(15		)	23		35
Gross loan and lease charge-offs	98			6			13		117
Recoveries	36			12			8		56
Net loan and lease charge-offs (recoveries)	62			(6		)	5		61
Balance at end of period	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments
Balance at beginning of period	$	54		$	11		$	—	$	65
Provision for unfunded lending commitments	(5		)	(1		)	—		(6		)
Balance at end of period	$	49		$	10		$	—	$	59
Total allowance for credit losses at end of period
Allowance for loan losses	$	385		$	107		$	49	$	541
Reserve for unfunded lending commitments	49			10			—		59
Total allowance for credit losses	$	434		$	117		$	49	$	600

Summary Of Nonaccrual Loans

Nonaccrual loans are summarized as follows:
(In millions)	September 30, 2018		December 31, 2017
Loans held for sale	$	—	$	12
Commercial:
Commercial and industrial	$	112	$	195
Leasing	2		8
Owner-occupied	66		90
Municipal	1		1
Total commercial	181		294
Commercial real estate:
Construction and land development	—		4
Term	46		36
Total commercial real estate	46		40
Consumer:
Home equity credit line	13		13
1-4 family residential	47		55
Construction and other consumer real estate	—		—
Bankcard and other revolving plans	1		—
Other	—		—
Total consumer loans	61		68
Total	$	288	$	402

Summary Of Past Due Loans (Accruing And Nonaccruing)

Past due loans (accruing and nonaccruing) are summarized as follows:
	September 30, 2018
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	61	$	—	$	—	$	—	$	61	$	—	$	—
Commercial:
Commercial and industrial	$	14,006	$	40	$	50	$	90	$	14,096	$	6	$	63
Leasing	331		—		1		1		332		—		1
Owner-occupied	7,500		26		22		48		7,548		2		41
Municipal	1,563		—		—		—		1,563		—		1
Total commercial	23,400		66		73		139		23,539		8		106
Commercial real estate:
Construction and land development	2,295		—		—		—		2,295		—		—
Term	8,728		16		8		24		8,752		3		32
Total commercial real estate	11,023		16		8		24		11,047		3		32
Consumer:
Home equity credit line	2,872		5		7		12		2,884		—		4
1-4 family residential	7,008		15		16		31		7,039		—		23
Construction and other consumer real estate	634		10		—		10		644		—		—
Bankcard and other revolving plans	478		3		2		5		483		1		—
Other	173		1		—		1		174		—		—
Total consumer loans	11,165		34		25		59		11,224		1		27
Total	$	45,588	$	116	$	106	$	222	$	45,810	$	12	$	165

	December 31, 2017
(In millions)	Current		30-89 days past due		90+ days past due		Total past due		Total loans		Accruing loans 90+ days past due		Nonaccrual loans that are current 1
Loans held for sale	$	44	$	—	$	—	$	—	$	44	$	—	$	12
Commercial:
Commercial and industrial	$	13,887	$	60	$	56	$	116	$	14,003	$	13	$	146
Leasing	363		1		—		1		364		—		8
Owner-occupied	7,219		29		40		69		7,288		4		49
Municipal	1,271		—		—		—		1,271		—		1
Total commercial	22,740		90		96		186		22,926		17		204
Commercial real estate:
Construction and land development	2,014		3		4		7		2,021		—		—
Term	9,079		13		11		24		9,103		2		25
Total commercial real estate	11,093		16		15		31		11,124		2		25
Consumer:
Home equity credit line	2,763		9		5		14		2,777		—		5
1-4 family residential	6,621		16		25		41		6,662		1		27
Construction and other consumer real estate	590		6		1		7		597		1		—
Bankcard and other revolving plans	506		2		1		3		509		1		—
Other	184		1		—		1		185		—		—
Total consumer loans	10,664		34		32		66		10,730		3		32
Total	$	44,497	$	140	$	143	$	283	$	44,780	$	22	$	261

¹  Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators

	September 30, 2018
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	13,416	$	311	$	369	$	—	$	14,096
Leasing	318		10		4		—		332
Owner-occupied	7,253		84		211		—		7,548
Municipal	1,536		4		23		—		1,563
Total commercial	22,523		409		607		—		23,539		$	314
Commercial real estate:
Construction and land development	2,284		11		—		—		2,295
Term	8,631		18		103		—		8,752
Total commercial real estate	10,915		29		103		—		11,047		115
Consumer:
Home equity credit line	2,866		—		18		—		2,884
1-4 family residential	6,988		—		51		—		7,039
Construction and other consumer real estate	642		—		2		—		644
Bankcard and other revolving plans	480		—		3		—		483
Other	174		—		—		—		174
Total consumer loans	11,150		—		74		—		11,224		51
Total	$	44,588	$	438	$	784	$	—	$	45,810	$	480

	December 31, 2017
(In millions)	Pass		Special Mention		Sub- standard		Doubtful		Total loans		Total allowance
Commercial:
Commercial and industrial	$	13,001	$	395	$	606	$	1	$	14,003
Leasing	342		6		16		—		364
Owner-occupied	6,920		93		275		—		7,288
Municipal	1,257		13		1		—		1,271
Total commercial	21,520		507		898		1		22,926		$	371
Commercial real estate:
Construction and land development	2,002		15		4		—		2,021
Term	8,816		138		149		—		9,103
Total commercial real estate	10,818		153		153		—		11,124		103
Consumer:
Home equity credit line	2,759		—		18		—		2,777
1-4 family residential	6,602		—		60		—		6,662
Construction and other consumer real estate	596		—		1		—		597
Bankcard and other revolving plans	507		—		2		—		509
Other	185		—		—		—		185
Total consumer loans	10,649		—		81		—		10,730		44
Total	$	42,987	$	660	$	1,132	$	1	$	44,780	$	518

Summary Of Information On Impaired Loans

	September 30, 2018
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	170	$	72	$	47	$	119	$	8
Owner-occupied	66		39		21		60		2
Municipal	1		1		—		1		—
Total commercial	237		112		68		180		10
Commercial real estate:
Construction and land development	1		—		1		1		—
Term	59		44		5		49		—
Total commercial real estate	60		44		6		50		—
Consumer:
Home equity credit line	16		12		2		14		3
1-4 family residential	70		33		26		59		—
Construction and other consumer real estate	2		1		—		1		—
Other	—		—		—		—		—
Total consumer loans	88		46		28		74		3
Total	$	385	$	202	$	102	$	304	$	13

	December 31, 2017
(In millions)	Unpaid principal balance		Recorded investment				Total recorded investment		Related allowance
			with no allowance		with allowance
Commercial:
Commercial and industrial	$	293	$	80	$	142	$	222	$	24
Owner-occupied	120		79		23		102		2
Municipal	1		1		—		1		—
Total commercial	414		160		165		325		26
Commercial real estate:
Construction and land development	8		4		2		6		—
Term	56		36		12		48		—
Total commercial real estate	64		40		14		54		—
Consumer:
Home equity credit line	25		13		9		22		—
1-4 family residential	67		28		29		57		4
Construction and other consumer real estate	2		1		1		2		—
Other	1		1		—		1		—
Total consumer loans	95		43		39		82		4
Total	$	573	$	243	$	218	$	461	$	30

	Three Months Ended September 30, 2018				Nine Months Ended September 30, 2018
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	124	$	—	$	108	$	—
Owner-occupied	51		—		46		8
Municipal	1		—		1		—
Total commercial	176		—		155		8
Commercial real estate:
Construction and land development	1		—		1		—
Term	49		—		50		1
Total commercial real estate	50		—		51		1
Consumer:
Home equity credit line	14		—		13		—
1-4 family residential	58		—		53		—
Construction and other consumer real estate	1		—		1		—
Other	—		—		—		—
Total consumer loans	73		—		67		—
Total	$	299	$	—	$	273	$	9

	Three Months Ended September 30, 2017				Nine Months Ended September 30, 2017
(In millions)	Average recorded investment		Interest income recognized		Average recorded investment		Interest income recognized
Commercial:
Commercial and industrial	$	356	$	1	$	311	$	5
Owner-occupied	104		2		101		5
Municipal	1		—		1		—
Total commercial	461		3		413		10
Commercial real estate:
Construction and land development	10		—		11		—
Term	53		1		58		11
Total commercial real estate	63		1		69		11
Consumer:
Home equity credit line	21		—		21		1
1-4 family residential	53		1		53		1
Construction and other consumer real estate	2		—		2		—
Other	1		—		1		—
Total consumer loans	77		1		77		2
Total	$	601	$	5	$	559	$	23

Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type

	September 30, 2018
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	4	$	—	$	—	$	15	$	7	$	26
Owner-occupied	1		2		—		—		1		16		20
Municipal	—		—		—		—		—		—		—
Total commercial	1		6		—		—		16		23		46
Commercial real estate:
Construction and land development	—		—		—		—		—		1		1
Term	4		2		—		1		—		6		13
Total commercial real estate	4		2		—		1		—		7		14
Consumer:
Home equity credit line	—		2		8		—		—		3		13
1-4 family residential	1		1		6		—		2		30		40
Construction and other consumer real estate	—		—		—		—		—		1		1
Total consumer loans	1		3		14		—		2		34		54
Total accruing	6		11		14		1		18		64		114
Nonaccruing
Commercial:
Commercial and industrial	—		6		1		1		12		38		58
Owner-occupied	1		2		—		1		1		5		10
Municipal	—		—		—		—		—		1		1
Total commercial	1		8		1		2		13		44		69
Commercial real estate:
Term	3		—		—		2		4		1		10
Total commercial real estate	3		—		—		2		4		1		10
Consumer:
Home equity credit line	—		—		1		—		—		—		1
1-4 family residential	—		—		1		—		1		8		10
Total consumer loans	—		—		2		—		1		8		11
Total nonaccruing	4		8		3		4		18		53		90
Total	$	10	$	19	$	17	$	5	$	36	$	117	$	204

¹ Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

	December 31, 2017
	Recorded investment resulting from the following modification types:
(In millions)	Interest rate below market		Maturity or term extension		Principal forgiveness		Payment deferral		Other1		Multiple modification types2		Total
Accruing
Commercial:
Commercial and industrial	$	—	$	2	$	—	$	—	$	12	$	33	$	47
Owner-occupied	1		1		—		—		7		14		23
Total commercial	1		3		—		—		19		47		70
Commercial real estate:
Construction and land development	—		—		—		—		—		2		2
Term	6		—		—		1		—		7		14
Total commercial real estate	6		—		—		1		—		9		16
Consumer:
Home equity credit line	—		2		9		—		1		3		15
1-4 family residential	1		—		6		1		2		26		36
Construction and other consumer real estate	—		1		—		—		—		1		2
Total consumer loans	1		3		15		1		3		30		53
Total accruing	8		6		15		2		22		86		139
Nonaccruing
Commercial:
Commercial and industrial	—		3		5		2		28		24		62
Owner-occupied	1		2		—		1		1		5		10
Municipal	—		1		—		—		—		—		1
Total commercial	1		6		5		3		29		29		73
Commercial real estate:
Term	2		—		—		—		—		3		5
Total commercial real estate	2		—		—		—		—		3		5
Consumer:
Home equity credit line	—		—		1		—		—		—		1
1-4 family residential	—		—		2		—		1		5		8
Total consumer loans	—		—		3		—		1		5		9
Total nonaccruing	3		6		8		3		30		37		87
Total	$	11	$	12	$	23	$	5	$	52	$	123	$	226

¹  Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

²  Includes TDRs that resulted from a combination of any of the previous modification types.

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Derivative Instruments And Hedging Activities Derivative Instruments and Hedging Activities (Tables)

9 Months Ended

Sep. 30, 2018

Derivative Instruments, Gain (Loss) [Line Items]

Schedule of Derivative Instruments

	September 30, 2018						December 31, 2017
	Notional amount		Fair value				Notional amount		Fair value
(In millions)			Other assets		Other liabilities				Other assets		Other liabilities
Derivatives designated as hedging instruments:
Cash flow hedges:
Interest rate swaps	$	713	$	—	$	—	$	1,138	$	—	$	—
Fair value hedges:
Interest rate swaps	500		—		—		—		—		—
Total derivatives designated as hedging instruments	1,213		—		—		1,138		—		—
Derivatives not designated as hedging instruments:
Interest rate swaps and forwards	237		1		—		223		1		—
Interest rate swaps for customers 1	5,345		18		73		4,550		28		33
Foreign exchange	324		4		3		913		9		7
Total derivatives not designated as hedging instruments	5,906		23		76		5,686		38		40
Total derivatives	$	7,119	$	23	$	76	$	6,824	$	38	$	40

¹ Notional amounts include both the customer swaps and the offsetting derivative contracts.

Schedule Of Gain (Loss) Of Derivative Instruments

	Gain/(loss) recorded in income
	Three Months Ended September 30, 2018							Three Months Ended September 30, 2017
(In millions)	Derivatives		Hedged items			Total income statement impact		Derivatives		Hedged items		Total income statement impact
Interest rate swaps1	$	1	$	(1	)	$	—	$	—	$	—	$	—

	Gain/(loss) recorded in income
	Nine Months Ended September 30, 2018							Nine Months Ended September 30, 2017
(In millions)	Derivatives		Hedged items			Total income statement impact		Derivatives		Hedged items		Total income statement impact
Interest rate swaps1	$	1	$	(1	)	$	—	$	—	$	—	$	—

¹  Consists of hedges of benchmark interest rate risk of fixed-rate long-term debt. Gains and losses were recorded in net interest income.

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2018										Nine Months Ended September 30, 2018
(In millions)	OCI			Reclassified from AOCI to interest income			Noninterest income (expense)		Offset to interest expense		OCI			Reclassified from AOCI to interest income			Noninterest income (expense)		Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	(1	)	$	(1	)					$	(8	)	$	(3	)
Derivatives not designated as hedging instruments:
Interest rate swaps for customers							$	8									$	12
Foreign exchange							6										13
Total derivatives	$	(1	)	$	(1	)	$	14	$	—	$	(8	)	$	(3	)	$	25	$	—

	Amount of derivative gain (loss) recognized/reclassified
	Three Months Ended September 30, 2017								Nine Months Ended September 30, 2017
(In millions)	OCI		Reclassified from AOCI to interest income		Noninterest income (expense)		Offset to interest expense		OCI		Reclassified from AOCI to interest income		Noninterest income (expense)			Offset to interest expense
Derivatives designated as hedging instruments:
Cash flow hedges1:
Interest rate swaps	$	—	$	—					$	—	$	3
Derivatives not designated as hedging instruments:
Interest rate swaps and forward contracts					$	—							$	(1	)
Interest rate swaps for customers					4								8
Foreign exchange					4								12
Total derivatives	$	—	$	—	$	8	$	—	$	—	$	3	$	19		$	—

Note: These schedules are not intended to present at any given time the Bank’s long/short position with respect to its derivative contracts.

¹  Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2018, we estimate that $(6) million will be reclassified from AOCI into interest income

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Derivative Instruments And Hedging Activities Long-term debt derivative (Tables)

9 Months Ended

Sep. 30, 2018

Derivatives, Fair Value [Line Items]

Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

	Carrying amount of the hedged assets/(liabilities)					Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)
(In millions)	2018			2017		2018		2017
Long-term debt	$	(499	)	$	—	$	1	$	—

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Debt And Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt is summarized as follows:

(In millions)	September 30, 2018		December 31, 2017
Subordinated notes	$	247	$	247
Senior notes	632		135
Capital lease obligations	—		1
Total	$	879	$	383

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

	Amounts reclassified from AOCI 1					Amounts reclassified from AOCI 1					Statement of income (SI) Balance sheet (BS)
(In millions)	Three Months Ended September 30,					Nine Months Ended September 30,
Details about AOCI components	2018			2017		2018			2017			Affected line item
Net unrealized gains on derivative instruments	$	(1	)	$	—	$	(3	)	$	3	SI	Interest and fees on loans
Income tax expense	—			—		(1		)	1
Amounts Reclassified from AOCI	$	(1	)	$	—	$	(2	)	$	2

¹  Positive reclassification amounts indicate increases to earnings in the statement of income and decreases to balance sheet assets.

Schedule Of Changes In Accumulated Other Comprehensive Income (Loss)

(In millions)	Net unrealized gains (losses) on investment securities			Net unrealized gains (losses) on derivatives and other			Pension and post-retirement			Total
Nine Months Ended September 30, 2018
Balance at December 31, 2017	$	(114	)	$	(2	)	$	(23	)	$	(139	)
OCI (loss) before reclassifications, net of tax	(221		)	(3		)	—			(224		)
Amounts reclassified from AOCI, net of tax	—			2			—			2
OCI (loss)	(221		)	(1		)	—			(222		)
Balance at September 30, 2018	$	(335	)	$	(3	)	$	(23	)	$	(361	)
Income tax benefit included in OCI (loss)	$	(73	)	$	—		$	—		$	(73	)
Nine Months Ended September 30, 2017
Balance at December 31, 2016	$	(93	)	$	2		$	(31	)	$	(122	)
OCI before reclassifications, net of tax	65			2			—			67
Amounts reclassified from AOCI, net of tax	—			(2		)	—			(2		)
OCI	65			—			—			65
Balance at September 30, 2017	$	(28	)	$	2		$	(31	)	$	(57	)
Income tax expense included in OCI	$	40		$	—		$	—		$	40

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Commitments, Guarantees, And Contingent Liabilities (Tables)

9 Months Ended

Sep. 30, 2018

Guarantees, Commitments And Contingencies [Abstract]

Schedule Of Guarantees Issued

(In millions)	September 30, 2018		December 31, 2017
Net unfunded commitments to extend credit 1	$	20,999	$	19,583
Standby letters of credit:
Financial	673		721
Performance	196		196
Commercial letters of credit	20		31
Total unfunded lending commitments	$	21,888	$	20,531

¹  Net of participations

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Revenue Recognition Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2018

Revenue Recognition and Deferred Revenue [Abstract]

Revenue Recognition, Services, Commissions [Policy Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions)	2018		2017		2018		2017
Card Fee Income	$	36	$	34	$	103	$	101
ATM Fees	2		2		7		7
Other service charges	4		4		11		11
Other Commissions and fees	5		4		15		11
Ending balance	$	47	$	44	$	136	$	130

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

	Zions Bank				Amegy						CB&T
(In millions)	2018		2017		2018			2017			2018		2017
Service charges and fees on deposit accounts	$	14	$	16	$	11		$	9		$	7	$	7
Other service charges, commissions, and fees	19		18		9			9			6		6
Wealth management and trust income	4		4		3			2			1		1
Capital markets and foreign exchange	1		1		(1		)	(1		)	1		1
Total noninterest income from contracts with customers (ASC 606)	38		39		22			19			15		15
Other noninterest income (Non-ASC 606 customer related)	—		—		9			9			4		4
Total customer-related fees	38		39		31			28			19		19
Other noninterest income (non-customer related)	—		—		—			—			—		1
Total non-interest income	38		39		31			28			19		20
Other real estate owned gain from sale	—		—		—			—			—		1
Net interest income	177		165		133			122			138		120
Total income less interest expense	$	215	$	204	$	164		$	150		$	157	$	141

	NBAZ				NSB				Vectra
(In millions)	2018		2017		2018		2017		2018		2017
Service charges and fees on deposit accounts	$	3	$	3	$	4	$	4	$	2	$	2
Other service charges, commissions, and fees	3		4		3		3		2		3
Wealth management and trust income	—		—		1		1		—		—
Capital markets and foreign exchange	—		—		—		—		—		—
Total noninterest income from contracts with customers (ASC 606)	6		7		8		8		4		5
Other noninterest income (Non-ASC 606 customer related)	3		2		2		2		2		2
Total customer-related fees	9		9		10		10		6		7
Other noninterest income (non-customer related)	1		1		—		1		—		—
Total non-interest income	10		10		10		11		6		7
Other real estate owned gain from sale	—		—		—		—		—		—
Net interest income	59		53		38		33		35		32
Total income less interest expense	$	69	$	63	$	48	$	44	$	41	$	39

	TCBW				Other						Consolidated Bank
(In millions)	2018		2017		2018			2017			2018		2017
Service charges and fees on deposit accounts	$	—	$	—	$	1		$	1		$	42	$	42
Other service charges, commissions, and fees	1		1		4			—			47		44
Wealth management and trust income	—		—		3			3			12		11
Capital markets and foreign exchange	—		—		2			2			3		3
Total noninterest income from contracts with customers (ASC 606)	1		1		10			6			104		100
Other noninterest income (Non-ASC 606 customer related)	—		—		1			3			21		22
Total customer-related fees	1		1		11			9			125		122
Other noninterest income (non-customer related)	—		—		10			14			11		17
Total non-interest income	1		1		21			23			136		139
Other real estate owned gain from sale	—		—		—			—			—		1
Net interest income	14		12		(29		)	(15		)	565		522
Total income less interest expense	$	15	$	13	$	(8	)	$	8		$	701	$	662

The following schedule sets forth the noninterest income and net revenue by operating segments for the nine months endedSeptember 30, 2018 and 2017:

	Zions Bank						Amegy						CB&T
(In millions)	2018			2017			2018			2017			2018		2017
Service charges and fees on deposit accounts	$	43		$	47		$	33		$	31		$	21	$	21
Other service charges, commissions, and fees	54			53			28			28			18		18
Wealth management and trust income	11			11			8			6			3		2
Capital markets and foreign exchange	4			3			(4		)	(4		)	3		3
Total noninterest income from contracts with customers (ASC 606)	112			114			65			61			45		44
Other noninterest income (Non-ASC 606 customer related)	(2		)	(1		)	30			27			12		11
Total customer-related fees	110			113			95			88			57		55
Other noninterest income (non-customer related)	1			(1		)	—			(1		)	2		1
Total non-interest income	111			112			95			87			59		56
Other real estate owned gain from sale	—			—			—			—			—		1
Net interest income	516			475			385			360			399		355
Total income less interest expense	$	627		$	587		$	480		$	447		$	458	$	412

	NBAZ				NSB				Vectra
(In millions)	2018		2017		2018		2017		2018		2017
Service charges and fees on deposit accounts	$	9	$	10	$	10	$	11	$	7	$	6
Other service charges, commissions, and fees	9		9		9		9		5		5
Wealth management and trust income	1		1		3		2		1		1
Capital markets and foreign exchange	—		—		1		—		—		1
Total noninterest income from contracts with customers (ASC 606)	19		20		23		22		13		13
Other noninterest income (Non-ASC 606 customer related)	7		7		7		7		5		5
Total customer-related fees	26		27		30		29		18		18
Other noninterest income (non-customer related)	3		2		—		1		—		1
Total non-interest income	29		29		30		30		18		19
Other real estate owned gain from sale	—		—		—		—		—		—
Net interest income	170		152		111		96		101		94
Total income less interest expense	$	199	$	181	$	141	$	126	$	119	$	113

	TCBW				Other						Consolidated Bank
(In millions)	2018		2017		2018			2017			2018		2017
Service charges and fees on deposit accounts	$	1	$	1	$	1		$	—		$	125	$	127
Other service charges, commissions, and fees	2		2		11			6			136		130
Wealth management and trust income	—		—		11			7			38		30
Capital markets and foreign exchange	—		—		4			4			8		7
Total noninterest income from contracts with customers (ASC 606)	3		3		27			17			307		294
Other noninterest income (Non-ASC 606 customer related)	1		—		5			7			65		63
Total customer-related fees	4		3		32			24			372		357
Other noninterest income (non-customer related)	—		—		34			44			40		47
Total non-interest income	4		3		66			68			412		404
Other real estate owned gain from sale	—		—		1			1			1		2
Net interest income	38		34		(66		)	(27		)	1,654		1,539
Total income less interest expense	$	42	$	37	$	1		$	42		$	2,067	$	1,945

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Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2018

Defined Benefit Plan [Abstract]

Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans

(In millions)	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Interest cost	$	1		$	2		$	4		$	5
Expected return on plan assets	(3		)	(3		)	(9		)	(9		)
Partial settlement loss	1			1			2			2
Amortization of net actuarial loss	—			1			1			4
Net periodic benefit cost (benefit)	$	(1	)	$	1		$	(2	)	$	2

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Net Earnings per Common Share Basic and diluted net earnings per common share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]

Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except shares and per share amounts)	2018		2017		2018		2017
Basic:
Net income	$	223	$	160	$	658	$	469
Less common and preferred dividends	66		32		170		89
Undistributed earnings	157		128		488		380
Less undistributed earnings applicable to nonvested shares	1		1		4		4
Undistributed earnings applicable to common shares	156		127		484		376
Distributed earnings applicable to common shares	58		24		144		56
Total earnings applicable to common shares	$	214	$	151	$	628	$	432
Weighted average common shares outstanding (in thousands)	192,973		200,332		195,079		201,493
Net earnings per common share	$	1.11	$	0.75	$	3.22	$	2.14
Diluted:
Total earnings applicable to common shares	$	214	$	151	$	628	$	432
Weighted average common shares outstanding (in thousands)	192,973		200,332		195,079		201,493
Dilutive effect of common stock warrants (in thousands)	11,880		7,729		12,555		6,783
Dilutive effect of stock options (in thousands)	912		1,045		1,023		1,090
Weighted average diluted common shares outstanding (in thousands)	205,765		209,106		208,657		209,366
Net earnings per common share	$	1.04	$	0.72	$	3.01	$	2.06

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Net Earnings per Common Share Weighted average shares of stock awards that were anti-dilutive (Tables)

9 Months Ended

Sep. 30, 2018

Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]

Schedule of Weighted Average Number of Shares [Table Text Block]

	Three Months Ended September 30,		Nine Months Ended September 30,
(In thousands)	2018	2017	2018	2017
Restricted stock and restricted stock units	1,490	1,779	1,651	1,997

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Operating Segment Information (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting Information [Line Items]

Operating Segment Information

OPERATING SEGMENT INFORMATION

We manage our operations and prepare management reports and other information with a primary focus on geographical area. Our banking operations are managed under their own individual brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. Performance assessment and resource allocation are based upon this geographical structure. We use an internal funds transfer pricing (“FTP”) allocation system to report results of operations for business segments. This process continues to be refined. Prior period amounts have been reclassified to reflect these changes. Total average loans and deposits presented for the banking segments do not include intercompany amounts between banking segments, but may include deposits with the Other segment.

As of September 30, 2018, our banking business is conducted through 7 locally managed and branded segments in distinct geographical areas. Zions Bank operates 97 branches in Utah, 23 branches in Idaho, and one branch in Wyoming. Amegy operates 73 branches in Texas. CB&T operates 90 branches in California. NBAZ operates 58 branches in Arizona. NSB operates 50 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates one branch in Washington and one branch in Oregon.

The operating segment identified as “Other” includes certain nonbank financial service subsidiaries, centralized back-office functions, and eliminations of transactions between segments. The major components of net interest income at the Bank’s back-office include the revenue associated with the investments securities portfolio and the offset of the FTP costs and benefits provided to the business segments.

The following schedule does not present total assets or income tax expense for each operating segment, but instead presents average loans, average deposits and income before income taxes because these are the metrics that management uses when evaluating performance and making decisions pertaining to the operating segments. The Bank’s net interest income includes interest expense on borrowed funds. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment.

The accounting policies of the individual operating segments are the same as those of the Bank. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations.

The following schedule presents selected operating segment information for the three months ended September 30, 2018 and 2017:

(In millions)	Zions Bank					Amegy					CB&T
	2018		2017			2018			2017		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	177	$	165		$	133		$	122	$	138	$	120
Provision for loan losses	2		(15		)	(16		)	33		3		(4		)
Net interest income after provision for loan losses	175		180			149			89		135		124
Noninterest income	38		39			31			28		19		20
Noninterest expense	118		107			84			86		77		74
Income (loss) before income taxes	$	95	$	112		$	96		$	31	$	77	$	70
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	12,607	$	12,543		$	11,328		$	11,170	$	9,985	$	9,575
Total average deposits	15,845		15,773			11,185			10,862		11,335		11,021

(In millions)	NBAZ						NSB					Vectra
	2018			2017			2018		2017			2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	59		$	53		$	38	$	33		$	35	$	32
Provision for loan losses	(1		)	(8		)	—		(3		)	1		—
Net interest income after provision for loan losses	60			61			38		36			34		32
Noninterest income	10			10			10		11			6		7
Noninterest expense	39			38			35		35			26		25
Income (loss) before income taxes	$	31		$	33		$	13	$	12		$	14	$	14
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	4,591		$	4,267		$	2,408	$	2,347		$	2,969	$	2,683
Total average deposits	5,008			4,816			4,302		4,276			2,789		2,757

(In millions)	TCBW				Other						Consolidated Bank
	2018		2017		2018			2017			2018			2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	14	$	12	$	(29	)	$	(15	)	$	565		$	522
Provision for loan losses	—		3		—			(1		)	(11		)	5
Net interest income after provision for loan losses	14		9		(29		)	(14		)	576			517
Noninterest income	1		1		21			23			136			139
Noninterest expense	6		5		35			43			420			413
Income (loss) before income taxes	$	9	$	5	$	(43	)	$	(34	)	$	292		$	243
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	1,136	$	939	$	344		$	308		$	45,368		$	43,832
Total average deposits	1,086		1,098		2,025			1,318			53,575			51,921

The following schedule presents selected operating segment information for the nine months ended September 30, 2018 and 2017:

(In millions)	Zions Bank				Amegy					CB&T
	2018		2017		2018			2017		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	516	$	475	$	385		$	360	$	399	$	355
Provision for loan losses	3		18		(72		)	41		7		(10		)
Net interest income after provision for loan losses	513		457		457			319		392		365
Noninterest income	111		112		95			87		59		56
Noninterest expense	350		327		254			259		231		225
Income (loss) before income taxes	$	274	$	242	$	298		$	147	$	220	$	196
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	12,565	$	12,505	$	11,362		$	10,890	$	9,941	$	9,453
Total average deposits	15,847		16,001		11,022			11,131		11,213		10,953

(In millions)	NBAZ					NSB					Vectra
	2018		2017			2018		2017			2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	170	$	152		$	111	$	96		$	101	$	94
Provision for loan losses	8		(7		)	—		(8		)	5		—
Net interest income after provision for loan losses	162		159			111		104			96		94
Noninterest income	29		29			30		30			18		19
Noninterest expense	115		111			108		105			79		75
Income (loss) before income taxes	$	76	$	77		$	33	$	29		$	35	$	38
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	4,591	$	4,258		$	2,369	$	2,352		$	2,882	$	2,607
Total average deposits	4,912		4,747			4,280		4,240			2,762		2,758

(In millions)	TCBW				Other						Consolidated Bank
	2018		2017		2018			2017			2018			2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	38	$	34	$	(66	)	$	(27	)	$	1,654		$	1,539
Provision for loan losses	2		2		1			(1		)	(46		)	35
Net interest income after provision for loan losses	36		32		(67		)	(26		)	1,700			1,504
Noninterest income	4		3		66			68			412			404
Noninterest expense	16		16		106			114			1,259			1,232
Income (loss) before income taxes	$	24	$	19	$	(107	)	$	(72	)	$	853		$	676
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	1,113	$	909	$	336		$	244		$	45,159		$	43,218
Total average deposits	1,069		1,098		1,722			1,227			52,827			52,155

Schedule of Segment Reporting Information, by Segment

(In millions)	Zions Bank					Amegy					CB&T
	2018		2017			2018			2017		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	177	$	165		$	133		$	122	$	138	$	120
Provision for loan losses	2		(15		)	(16		)	33		3		(4		)
Net interest income after provision for loan losses	175		180			149			89		135		124
Noninterest income	38		39			31			28		19		20
Noninterest expense	118		107			84			86		77		74
Income (loss) before income taxes	$	95	$	112		$	96		$	31	$	77	$	70
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	12,607	$	12,543		$	11,328		$	11,170	$	9,985	$	9,575
Total average deposits	15,845		15,773			11,185			10,862		11,335		11,021

(In millions)	NBAZ						NSB					Vectra
	2018			2017			2018		2017			2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	59		$	53		$	38	$	33		$	35	$	32
Provision for loan losses	(1		)	(8		)	—		(3		)	1		—
Net interest income after provision for loan losses	60			61			38		36			34		32
Noninterest income	10			10			10		11			6		7
Noninterest expense	39			38			35		35			26		25
Income (loss) before income taxes	$	31		$	33		$	13	$	12		$	14	$	14
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	4,591		$	4,267		$	2,408	$	2,347		$	2,969	$	2,683
Total average deposits	5,008			4,816			4,302		4,276			2,789		2,757

(In millions)	TCBW				Other						Consolidated Bank
	2018		2017		2018			2017			2018			2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	14	$	12	$	(29	)	$	(15	)	$	565		$	522
Provision for loan losses	—		3		—			(1		)	(11		)	5
Net interest income after provision for loan losses	14		9		(29		)	(14		)	576			517
Noninterest income	1		1		21			23			136			139
Noninterest expense	6		5		35			43			420			413
Income (loss) before income taxes	$	9	$	5	$	(43	)	$	(34	)	$	292		$	243
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	1,136	$	939	$	344		$	308		$	45,368		$	43,832
Total average deposits	1,086		1,098		2,025			1,318			53,575			51,921

The following schedule presents selected operating segment information for the nine months ended September 30, 2018 and 2017:

(In millions)	Zions Bank				Amegy					CB&T
	2018		2017		2018			2017		2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	516	$	475	$	385		$	360	$	399	$	355
Provision for loan losses	3		18		(72		)	41		7		(10		)
Net interest income after provision for loan losses	513		457		457			319		392		365
Noninterest income	111		112		95			87		59		56
Noninterest expense	350		327		254			259		231		225
Income (loss) before income taxes	$	274	$	242	$	298		$	147	$	220	$	196
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	12,565	$	12,505	$	11,362		$	10,890	$	9,941	$	9,453
Total average deposits	15,847		16,001		11,022			11,131		11,213		10,953

(In millions)	NBAZ					NSB					Vectra
	2018		2017			2018		2017			2018		2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	170	$	152		$	111	$	96		$	101	$	94
Provision for loan losses	8		(7		)	—		(8		)	5		—
Net interest income after provision for loan losses	162		159			111		104			96		94
Noninterest income	29		29			30		30			18		19
Noninterest expense	115		111			108		105			79		75
Income (loss) before income taxes	$	76	$	77		$	33	$	29		$	35	$	38
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	4,591	$	4,258		$	2,369	$	2,352		$	2,882	$	2,607
Total average deposits	4,912		4,747			4,280		4,240			2,762		2,758

(In millions)	TCBW				Other						Consolidated Bank
	2018		2017		2018			2017			2018			2017
SELECTED INCOME STATEMENT DATA
Net interest income	$	38	$	34	$	(66	)	$	(27	)	$	1,654		$	1,539
Provision for loan losses	2		2		1			(1		)	(46		)	35
Net interest income after provision for loan losses	36		32		(67		)	(26		)	1,700			1,504
Noninterest income	4		3		66			68			412			404
Noninterest expense	16		16		106			114			1,259			1,232
Income (loss) before income taxes	$	24	$	19	$	(107	)	$	(72	)	$	853		$	676
SELECTED AVERAGE BALANCE SHEET DATA
Total average loans	$	1,113	$	909	$	336		$	244		$	45,159		$	43,218
Total average deposits	1,069		1,098		1,722			1,227			52,827			52,155

XML

Basis of Presentaion (Details)	Sep. 30, 2018 States
Basis Of Presentation [Abstract]
Number of States in which Entity Operates	11
Number of community regional banks operating in distinct geographical areas	7

XML

Fair Value (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	$ 108,000,000		$ 102,000,000
Other Assets, Fair Value Disclosure	108,000,000		102,000,000
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities	2,000,000	$ 1,000,000
Other noninterest-bearing investments valued under the cost method	11,000,000		10,000,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	311,000,000		338,000,000
Fair value of AFS securities	14,625,000,000		15,161,000,000
Net gains on sale of OREO properties		1,000,000
Principal amount of other real estate owned property sold	3,000,000	5,000,000
Equity Method Investments, Fair Value Disclosure	34,000,000		36,000,000
Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Other Assets, Fair Value Disclosure			102,000,000
Fair value of AFS securities	25,000,000		96,000,000
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	14,600,000,000		15,065,000,000
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0		0
Third Party Pricing Service [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0.95		0.92
Interest Rate Swaps For Customers [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	73,000,000		33,000,000
Other Assets, Fair Value Disclosure	18,000,000		28,000,000
Interest Rate Swaps For Customers [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Other Assets, Fair Value Disclosure	18,000,000		28,000,000
Warranty, Rights and Obligations, Fair Value Option [Member] | Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	108,000,000		102,000,000
Other Assets, Fair Value Disclosure	108,000,000
Available-for-sale Securities [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	1,284,000,000		1,334,000,000
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	1,284,000,000		1,334,000,000
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities
Other Real Estate Owned Properties [Member]
Derivatives, Fair Value [Line Items]
Net gains on sale of OREO properties	1,000,000	$ 2,000,000
Derivative [Member]
Derivatives, Fair Value [Line Items]
Other Assets, Fair Value Disclosure	1,000,000		1,000,000
Derivative [Member] | Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	3,000,000		7,000,000
Other Assets, Fair Value Disclosure	4,000,000		9,000,000
Derivative [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	73,000,000		33,000,000
Other Assets, Fair Value Disclosure	$ 1,000,000		$ 1,000,000

XML

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (Losses) on Sales of Other Real Estate		$ 1,000,000
Investments, Fair Value Disclosure	$ 14,625,000,000		$ 15,161,000,000
Debt Securities, Trading, and Equity Securities, FV-NI	176,000,000		148,000,000
Other Assets, Fair Value Disclosure	108,000,000		102,000,000
Assets, Fair Value Disclosure	15,569,000,000		16,069,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	49,000,000		95,000,000
Other Liabilities, Fair Value Disclosure	108,000,000		102,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	233,000,000		237,000,000
Principal amount of other real estate owned property sold	3,000,000	5,000,000
Other noninterest-bearing investments valued under the cost method	11,000,000		10,000,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	311,000,000		338,000,000
Equity Method Investments, Fair Value Disclosure	34,000,000		36,000,000
Other Real Estate Owned Properties [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (Losses) on Sales of Other Real Estate	1,000,000	$ 2,000,000
US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	13,317,000,000		13,731,000,000
Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	24,000,000		24,000,000
Interest Rate Swaps For Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	18,000,000		28,000,000
Other Liabilities, Fair Value Disclosure	73,000,000		33,000,000
Available-for-sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1,284,000,000		1,334,000,000
Derivative [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	1,000,000		1,000,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	256,000,000		207,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	160,000,000		204,000,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	15,192,000,000		15,749,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	73,000,000		33,000,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	121,000,000		113,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		0
Mutual Funds And Stock Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure			72,000,000
Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	516,000,000		507,000,000
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	103,000,000		95,000,000
Assets, Fair Value Disclosure	0		1,000,000
Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	18,000,000		18,000,000
Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	4,000,000		9,000,000
Other Liabilities, Fair Value Disclosure	3,000,000		7,000,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25,000,000		96,000,000
Debt Securities, Trading, and Equity Securities, FV-NI	119,000,000
Other Assets, Fair Value Disclosure			102,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	49,000,000		95,000,000
Fair Value, Inputs, Level 1 [Member] | Warranty, Rights and Obligations, Fair Value Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	108,000,000
Other Liabilities, Fair Value Disclosure	108,000,000		102,000,000
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25,000,000		25,000,000
Fair Value, Inputs, Level 1 [Member] | Derivative [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	4,000,000		9,000,000
Other Liabilities, Fair Value Disclosure	3,000,000		7,000,000
Fair Value, Inputs, Level 1 [Member] | Mutual Funds And Stock Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure			71,000,000
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Assets, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	14,600,000,000		15,065,000,000
Debt Securities, Trading, and Equity Securities, FV-NI	57,000,000		148,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	0		0
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	13,292,000,000		13,706,000,000
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	24,000,000		24,000,000
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps For Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	18,000,000		28,000,000
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1,284,000,000		1,334,000,000
Fair Value, Inputs, Level 2 [Member] | Derivative [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	1,000,000		1,000,000
Other Liabilities, Fair Value Disclosure	73,000,000		33,000,000
Fair Value, Inputs, Level 2 [Member] | Mutual Funds And Stock Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure			1,000,000
Fair Value, Inputs, Level 2 [Member] | Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	516,000,000		507,000,000
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Assets, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0		0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0		0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	103,000,000		95,000,000
Assets, Fair Value Disclosure	0		1,000,000
Fair Value, Inputs, Level 3 [Member] | Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	18,000,000		18,000,000
Third Party Pricing Service [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	$ 0.95		$ 0.92

XML

Fair Value (Schedule Of Key Model Inputs And Assumptions Used To Fair Value Certain Asset-Backed Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	$ 14,625	$ 15,161
Debt Securities, Trading, and Equity Securities, FV-NI	176	148
Other Assets, Fair Value Disclosure	108	102
Assets, Fair Value Disclosure	15,569	16,069
Financial Instruments Sold, Not yet Purchased, at Fair Value	49	95
Other Liabilities, Fair Value Disclosure	108	102
Financial and Nonfinancial Liabilities, Fair Value Disclosure	233	237
US Treasury Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	13,317	13,731
Interest Rate Swaps For Customers [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	18	28
Other Liabilities, Fair Value Disclosure	73	33
Fair Value, Inputs, Level 1 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assets, Fair Value Disclosure	256	207
Financial and Nonfinancial Liabilities, Fair Value Disclosure	160	204
Fair Value, Inputs, Level 2 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assets, Fair Value Disclosure	15,192	15,749
Financial and Nonfinancial Liabilities, Fair Value Disclosure	73	33
Fair Value, Inputs, Level 3 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assets, Fair Value Disclosure	121	113
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Foreign Exchange Contract [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	4	9
Other Liabilities, Fair Value Disclosure	3	7
Interest-Only-Strip [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	18	18
Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	103	95
Assets, Fair Value Disclosure	0	1
Bank-owned life insurance [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	516	507
Mutual Funds And Stock Equity Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure		72
Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	1,284	1,334
Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	1	1
Asset-backed Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	24	24
Fair Value, Inputs, Level 1 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	25	96
Debt Securities, Trading, and Equity Securities, FV-NI	119
Other Assets, Fair Value Disclosure		102
Financial Instruments Sold, Not yet Purchased, at Fair Value	49	95
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	25	25
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Mutual Funds And Stock Equity Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure		71
Fair Value, Inputs, Level 1 [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	4	9
Other Liabilities, Fair Value Disclosure	3	7
Fair Value, Inputs, Level 2 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	14,600	15,065
Debt Securities, Trading, and Equity Securities, FV-NI	57	148
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	13,292	13,706
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps For Customers [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	18	28
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Bank-owned life insurance [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	516	507
Fair Value, Inputs, Level 2 [Member] | Mutual Funds And Stock Equity Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure		1
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	1,284	1,334
Fair Value, Inputs, Level 2 [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	1	1
Other Liabilities, Fair Value Disclosure	73	33
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	24	24
Fair Value, Inputs, Level 3 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	0	0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Interest-Only-Strip [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	18	18
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	103	95
Assets, Fair Value Disclosure	0	1
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure

XML

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	$ 108		$ 108		$ 102
Other Liabilities, Fair Value Disclosure	108		108		102
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	102	$ 82	95	$ 73
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	(1)	5	0	7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	2	6	8	18
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	0	5
Fair value of assets, Ending balance	103	93	103	93
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	18	19	18	20
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	0	0	0	(1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	0	0
Fair value of assets, Ending balance	$ 18	$ 19	$ 18	$ 19
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure					$ 102

XML

Fair Value (Schedule Of Realized Gains (Losses) Using Level 3 Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	$ 15,569		$ 15,569			$ 16,069
Other Assets, Fair Value Disclosure	108		108			102
Other Liabilities, Fair Value Disclosure	108		108			102
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	103	$ 93	103	$ 93	$ 102	95	$ 82	$ 73
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	(1)	5	0	7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	2	6	8	18
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	0	(5)
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	18	19	18	19	$ 18	18	$ 19	$ 20
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	0	0
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	23		23			9
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			1
Level 3 Equity Securities Gains (Losses), Net [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gains (losses) from Level 3 inputs	0	$ 0	(3)	$ 3
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1		1			0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	24		24			10
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure						102
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	23		23			9
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1		1			0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	24		24			9
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			1
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	$ 0		$ 0			$ 1

XML

Fair Value (Schedule Of Assets With Fair Value Changes On Nonrecurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount of other real estate owned property sold			$ 3	$ 5
Gains (losses) from fair value changes	$ (9)	$ (1)	(16)	(9)
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	(9)	(1)	(15)	(8)
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	0	0	0	(1)
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	$ 0	$ 0	$ (1)	$ 0

XML

Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Held-to-maturity, fair value	$ 734
Long-term Debt	879	$ 383
Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Held-to-maturity	751	770
Time deposits	4,256	3,115
Other Short-term Borrowings	2,900	3,600
Long-term Debt	879	383
Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases (including loans held for sale), net of allowance	45,391	44,306
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Held-to-maturity, fair value	734	762
Time deposits	4,231	3,099
Other Short-term Borrowings	2,900	3,600
Long-term Debt	885	402
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases (including loans held for sale), net of allowance	$ 44,452	$ 44,226

XML

Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	$ 560	$ 514
Gross amounts recognized	781	809
Gross amounts offset in the balance sheet	(221)	(295)
Net amounts presented in the balance sheet	560	514
Gross amounts not offset in the balance sheet	0	0
Cash Collateral Received/Pledged	0	0
Derivative Financial Instruments, Assets [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	2	28
Gross amounts recognized	23	38
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	23	38
Gross amounts not offset in the balance sheet	(13)	(9)
Cash Collateral Received/Pledged	(8)	(1)
Assets, Total [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	562	542
Gross amounts recognized	804	847
Gross amounts offset in the balance sheet	(221)	(295)
Net amounts presented in the balance sheet	583	552
Gross amounts not offset in the balance sheet	(13)	(9)
Cash Collateral Received/Pledged	(8)	(1)
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	3,780	4,976
Gross amounts recognized	4,001	5,271
Gross amounts offset in the balance sheet	(221)	(295)
Net amounts presented in the balance sheet	3,780	4,976
Gross amounts not offset in the balance sheet	0	0
Cash Collateral Received/Pledged	0	0
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	63	25
Gross amounts recognized	76	40
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	76	40
Gross amounts not offset in the balance sheet	(13)	(9)
Cash Collateral Received/Pledged	0	(6)
Liabilities, Total [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	3,843	5,001
Gross amounts recognized	4,077	5,311
Gross amounts offset in the balance sheet	(221)	(295)
Net amounts presented in the balance sheet	3,856	5,016
Gross amounts not offset in the balance sheet	(13)	(9)
Cash Collateral Received/Pledged	$ 0	$ (6)

XML

Investment Securities (Narrative) (Details) $ in Millions	Sep. 30, 2018 USD ($) Securities	Dec. 31, 2017 USD ($) Securities
Investment [Line Items]
Other Real Estate, Foreclosed Assets, Residential Real Estate	$ 2	$ 1
Private equity investments prohibited by Volker rule	$ 3
Number of HTM investment securities in an unrealized loss position | Securities	676	667
Number of AFS investment securities in an unrealized loss position | Securities	3,018	2,262
Carrying value of pledged securities	$ 2,100
Private Equity Investments	148
Commitments for Private Equity and Other Noninterest-bearing Investments	31
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule	$ 2

XML

Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	$ 201
Held-to-maturity, fair value	734
Debt Securities, Available-for-sale, Amortized Cost	15,071	$ 15,241
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I		29
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I		181
Debt Securities, Available-for-sale	14,625	15,089
Available-for-sale Securities, Gross Unrealized Gain	8	29
Available-for-sale, Amortized cost	15,071	15,313
Available-for-sale, Gross unrealized losses, Recognized in OCI	454	181
Available-for-sale securities, Estimated fair value	14,625	15,161
amortized cost of investment securities	15,822	16,083
Gross Unrealized Gains of Investment Securities Recognized in OCI	12	34
Gross Unrealized Losses of Investment Securities Recognized in OCI	475	194
Estimated Fair Value of Investment Securities	15,359	15,923
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	199
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	1,572
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	1,528
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost	356
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	349
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	4,874
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	4,733
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost	139
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	135
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	4,650
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	4,509
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	55
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	51
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	3,975
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	3,855
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	751
Mutual Funds And Stock [Member]
Investment [Line Items]
Available-for-sale Securities, Gross Unrealized Gain		0
Available-for-sale, Amortized cost		72
Available-for-sale, Gross unrealized losses, Recognized in OCI		0
Available-for-sale securities, Estimated fair value		72
Available-for-sale, Other debt securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	25	25
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	0	0
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	1	1
Debt Securities, Available-for-sale	24	24
Small Business Administration Loan Backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,069	2,227
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	1	10
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	50	15
Debt Securities, Available-for-sale	2,020	2,222
Agency Guaranteed Mortgage Backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	10,159	9,798
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	6	9
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	341	141
Debt Securities, Available-for-sale	9,824	9,666
Agency Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,480	1,830
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	0	1
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	32	13
Debt Securities, Available-for-sale	1,448	1,818
US Treasury Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	25	25
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	0	0
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	0	0
Debt Securities, Available-for-sale	25	25
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value	734	762
Held-to-maturity, Amortized cost	751	770
Debt Securities, Available-for-sale, Amortized Cost	1,313	1,336
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	1	9
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	30	11
Debt Securities, Available-for-sale	1,284	1,334
Held-to-maturity Securities, Unrecognized Holding Gain (Deprecated 2018-01-31)	4	5
Held-to-maturity Securities, Unrecognized Holding Loss (Deprecated 2018-01-31)	$ 21	$ 13

XML

Investment Securities (Contractual Maturities Debt Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	$ 201
Held-to-maturity, Due in one year or less, Estimated fair value	199
Held-to-maturity, Due after one year through five years, Amortized cost	356
Held-to-maturity, Due after one year through five years, Estimated fair value	349
Held-to-maturity, Due after five years through ten years, Amortized cost	139
Held-to-maturity, Due after five years through ten years, Estimated fair value	135
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	55
Held-to-maturity, Due after ten years, Estimated fair value	51
Held-to-maturity, Amortized cost	751
Held-to-maturity, fair value	734
Available-for-sale, Due in one year or less, Amortized cost	1,572
Available-for-sale, Due in one year or less, Estimated fair value	1,528
Available-for-sale, Due after one year through five years, Amortized cost	4,874
Available-for-sale, Due after one year through five years, Estimated fair value	4,733
Available-for-sale, Due after five years through ten years, Amortized cost	4,650
Available-for-sale, Due after five years through ten years, Estimated fair value	4,509
Available-for-sale, Due after ten years, Amortized cost	3,975
Available-for-sale, Due after ten years, Estimated fair value	3,855
Available-for-sale, Amortized cost	15,071	$ 15,241
Available-for-sale, Estimated fair value	$ 14,625	$ 15,089

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Investment Securities (Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale, Unrealized losses, Other [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	14	14
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14	14
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	3
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	227	263
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	17	10
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	343	292
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	21	13
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	570	555
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	15	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	834	554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	15	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	331	230
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	30	11
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,165	784
Small Business Administration Loan Backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	25	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,414	408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	25	12
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	559	649
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	50	15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,973	1,057
Agency Guaranteed Mortgage Backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	92	29
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,821	3,609
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	249	112
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	5,354	4,721
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	341	141
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,175	8,330
Agency Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	20	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	970	808
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	12	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	354	808
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	32	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,324	$ 1,616
US Treasury Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 25

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Investment Securities (Gains And Losses, Including OTTI, Recognized In Statement Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments [Abstract]
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	$ 4	$ 5	$ 9	$ 20
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	5	0	10	7
Gain (Loss) on Investments	$ (1)	$ 5	$ (1)	$ 13

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Investment Securities Taxable and Nontaxable Interest Income by Investment Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Noninterest Income	$ 86	$ 84	$ 257	$ 246
Taxable [Member]
Noninterest Income	76	75	227	218
Nontaxable [Member]
Noninterest Income	10	9	30	28
Held-to-maturity Securities [Member]
Noninterest Income	7	5	19	17
Held-to-maturity Securities [Member] | Taxable [Member]
Noninterest Income	3	2	8	7
Held-to-maturity Securities [Member] | Nontaxable [Member]
Noninterest Income	4	3	11	10
Available-for-sale Securities [Member]
Noninterest Income	79	78	235	227
Available-for-sale Securities [Member] | Taxable [Member]
Noninterest Income	73	72	216	209
Available-for-sale Securities [Member] | Nontaxable [Member]
Noninterest Income	6	6	19	18
Other Trading [Member]
Noninterest Income	0	1	3	2
Other Trading [Member] | Taxable [Member]
Noninterest Income	0	1	3	2
Other Trading [Member] | Nontaxable [Member]
Noninterest Income	$ 0	$ 0	$ 0	$ 0

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Investment Securities Noncredit impairment recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Noncredit related impairment losses [Line Items]
Investment Income, Interest	$ 86	$ 84	$ 257	$ 246
Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	79	78	235	227
Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	7	5	19	17
Taxable [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	76	75	227	218
Taxable [Member] | Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	73	72	216	209
Taxable [Member] | Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	3	2	8	7
Nontaxable [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	10	9	30	28
Nontaxable [Member] | Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	6	6	19	18
Nontaxable [Member] | Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	$ 4	$ 3	$ 11	$ 10

XML

Loans And Allowance For Credit Losses (Narrative) (Details) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) d	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loans And Allowance For Credit Losses [Line Items]
Impaired loans, interest income, cash basis			$ 0	$ 0	$ 0
Impaired Financing Receivable, Average Recorded Investment		299	601	273	559
Impaired Financing Receivable, Interest Income, Accrual Method		0	5	9	23
Impaired Financing Receivable, Recorded Investment		304		304		$ 304			$ 461
Loans Receivable, Gross, Commercial and Industrial		14,096		14,096		14,096			14,003
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		14		14		14			31
Loans Modified As Troubled Debt Restructurings Loans						99
Unfunded Lending Commitments on Troubled Debt Restructuring		5		5		5			22
Loans and Leases Receivable, Gross		45,810		45,810		45,810			44,780
Financing Receivable, Recorded Investment, Current		45,588		45,588		45,588			44,497
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3	1	8	2		$ 84
Unearned income and fees, net of related costs		42		42		42			43
Land Development Loans		224		224		224			220
Loans at carrying value pledged as collateral for current and potential borrowings		23,400		23,400		23,400			25,600
Payments for Origination and Purchases of Loans Held-for-sale		184	176	584	640
Principal Balance of Loans Sold, Serviced Loans		2,200		2,200		2,200			2,200
Loans and Leases Receivable, Gain (Loss) on Sales, Net		3	1	10	9
Principle amount of loans held for sale sold		152	146	$ 464	696
Minimum number of days past due for nonaccrual status | d				90
Recorded investment in TDR loans modified with interest rates below market		90		$ 90		90			120
Provision for Loan and Lease Losses		(11)	5	(46)	35
Provision for Unfunded Lending Commitments (decrease)		0	(4)	0	(6)
Other Real Estate, Foreclosed Assets, and Repossessed Assets		2		2		2			1
Other Real Estate, In Process of Forecloseing Assets		10		10		10
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		116		116		116			140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		106		106		106			143
Financing Receivable, Recorded Investment, Past Due		222		222		222			283
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		12		12		12			22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	165		165		165			261
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		466		466		466			487
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		480	541	480	541	480	544	$ 490	518	$ 567
Financing Receivable, Individually Evaluated for Impairment		340		340		340			459
Financing Receivable, Collectively Evaluated for Impairment		45,470		45,470		45,470			44,294
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment		0		0		0			27
Leases Receivable, Gross, Commercial, Lease Financing		332		332		332			364
Commercial Lending Loans - Owner Occupied		7,548		7,548		7,548			7,288
Loans and Leases Receivable, Gross, Commercial, Governments		1,563		1,563		1,563			1,271
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,295		2,295		2,295			2,021
Commercial Real Estate Term Loans		8,752		8,752		8,752			9,103
Loans Receivable, Gross, Commercial, Real Estate		11,047		11,047		11,047			11,124
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884		2,884			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		7,039		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644		644			597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		483		483		483			509
Loans and Leases Receivable, Gross, Consumer, Other		174		174		174			185
Impaired Financing Receivable, Related Allowance		13		13		13			30
Impaired Financing Receivable, Unpaid Principal Balance		385		385		385			573
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses
Total reversal amount to allowance for loan and lease losses due to an increased cash flows from acquired loans		0
Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		1	1	1	1
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	0
Impaired Financing Receivable, Recorded Investment		1		1		1			1
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1		1			1
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		1		1		1			1
Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		1	2	1	2
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	0
Impaired Financing Receivable, Recorded Investment		1		1		1			2
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0		0			0
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		2		2		2			2
One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		58	53	53	53
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	0	1
Impaired Financing Receivable, Recorded Investment		59		59		59			57
Financing Receivable, Recorded Investment, Nonaccrual Status		47		47		47			55
Impaired Financing Receivable, Related Allowance		0		0		0			4
Impaired Financing Receivable, Unpaid Principal Balance		70		70		70			67
Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		119		119		119
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Financing Receivable, Recorded Investment, Nonaccrual Status		112		112		112			195
Impaired Financing Receivable, Related Allowance		8		8		8			24
Impaired Financing Receivable, Unpaid Principal Balance		170		170		170			293
Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		14	21	13	21
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	1
Impaired Financing Receivable, Recorded Investment		14		14		14			22
Financing Receivable, Recorded Investment, Nonaccrual Status		13		13		13			13
Impaired Financing Receivable, Related Allowance		3		3		3			0
Impaired Financing Receivable, Unpaid Principal Balance		16		16		16			25
Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		73	77	67	77
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	0	2
Impaired Financing Receivable, Recorded Investment		74		74		74			82
Financing Receivable, Recorded Investment, Nonaccrual Status		61		61		61			68
Impaired Financing Receivable, Related Allowance		3		3		3			4
Impaired Financing Receivable, Unpaid Principal Balance		88		88		88			95
Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		14,096		14,096		14,096			14,003
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		10		10		10			26
Loans and Leases Receivable, Gross		23,539		$ 23,539		23,539			22,926
Subsequent payment default period, number of days | d				90
Provision for Loan and Lease Losses		(11)	(4)	$ (69)	27
Provision for Unfunded Lending Commitments (decrease)		(1)	(4)	(6)	(5)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		304		304		304			345
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		314	385	314	385	314	393	321	371	420
Financing Receivable, Individually Evaluated for Impairment									314
Financing Receivable, Collectively Evaluated for Impairment									22,598
Leases Receivable, Gross, Commercial, Lease Financing		332		332		332			364
Commercial Lending Loans - Owner Occupied		7,548		7,548		7,548			7,288
Loans and Leases Receivable, Gross, Commercial, Governments		1,563		1,563		1,563			1,271
Loans and Leases Receivable, before Fees, Gross		23,539		23,539		23,539			22,926
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		0	1	0	1
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	0
Impaired Financing Receivable, Recorded Investment		0		0		0			1
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		3		3		3			4
Loans and Leases Receivable, Gross		11,224		$ 11,224		11,224			10,730
Subsequent payment default period, number of days | d				60
Provision for Loan and Lease Losses		5	16	$ 14	23
Provision for Unfunded Lending Commitments (decrease)		0	0	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0		0			0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		48		48		48			40
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		51	49	51	49	51	35	47	44	31
Financing Receivable, Individually Evaluated for Impairment									76
Financing Receivable, Collectively Evaluated for Impairment									10,648
Loans and Leases Receivable, before Fees, Gross		11,224		11,224		11,224			10,730
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884		2,884			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		7,039		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644		644			597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		483		483		483			509
Loans and Leases Receivable, Gross, Consumer, Other		174		174		174			185
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		0		0		0			1
Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		50	63	51	69
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	1	11
Impaired Financing Receivable, Recorded Investment		50		50		50			54
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment									1
Loans and Leases Receivable, Gross		11,047		11,047		11,047			11,124
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status		46		46		46			40
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment									102
Loans and Leases Receivable, Allowance		115		115		115			103
Financing Receivable, Individually Evaluated for Impairment									69
Financing Receivable, Collectively Evaluated for Impairment									11,048
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		60		60		60			64
Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		1	10	1	11
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	0
Impaired Financing Receivable, Recorded Investment									6
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1		1		1
Provision for Loan and Lease Losses		(5)	(7)	9	(15)
Provision for Unfunded Lending Commitments (decrease)		1	0	6	(1)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		114		114		114
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		115	107	115	107	115	$ 116	$ 122	103	$ 116
Land Development Loans, Loans Receivable Commercial Construction and Land Development									2,021
Commercial Real Estate Term Loans		8,752		8,752		8,752			9,103
Loans Receivable, Gross, Commercial, Real Estate		11,047		11,047		11,047			11,124
Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0		0			4
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,295		2,295		2,295
Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		1		1		1
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		1		1		1			8
Bankcard And Other Revolving Plans [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1		1			0
Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		51	104	46	101
Impaired Financing Receivable, Interest Income, Accrual Method		0	2	8	5
Impaired Financing Receivable, Recorded Investment		60		60		60			102
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
Financing Receivable, Recorded Investment, Nonaccrual Status		66		66		66			90
Impaired Financing Receivable, Related Allowance		2		2		2			2
Impaired Financing Receivable, Unpaid Principal Balance		66		66		66			120
Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		49	53	50	58
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	1	11
Impaired Financing Receivable, Recorded Investment		49		49		49			48
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status		46		46		46			36
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		59		59		59			56
Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,224		11,224		11,224			10,730
Financing Receivable, Recorded Investment, Current		11,165		11,165		11,165			10,664
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		34		34		34			34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25		25		25			32
Financing Receivable, Recorded Investment, Past Due		59		59		59			66
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1		1			3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	27		27		27			32
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		174		174		174			185
Financing Receivable, Recorded Investment, Current									184
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									0
Financing Receivable, Recorded Investment, Past Due		1		1		1			1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Consumer Portfolio Segment [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		173		173		173
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		1		1		1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0			0
Finance Leases Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		332		332		332			364
Financing Receivable, Recorded Investment, Current									363
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									0
Financing Receivable, Recorded Investment, Past Due		1		1		1			1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		7,548		7,548		7,548			7,288
Financing Receivable, Recorded Investment, Current									7,219
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									29
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									40
Financing Receivable, Recorded Investment, Past Due		48		48		48			69
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									4
Owner Occupied [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,500		7,500		7,500
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		26		26		26
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		22		22		22
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		2		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	41		41		41			49
Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		1,563		1,563		1,563			1,271
Financing Receivable, Recorded Investment, Current									1,271
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									0
Financing Receivable, Recorded Investment, Past Due		0		0		0			0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Municipal [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		1,563		1,563		1,563
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1		1			1
Commercial Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		23,539		23,539		23,539			22,926
Financing Receivable, Recorded Investment, Current		23,400		23,400		23,400			22,740
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		66		66		66			90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		73		73		73			96
Financing Receivable, Recorded Investment, Past Due		139		139		139			186
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		8		8		8			17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	106		106		106			204
Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,295		2,295		2,295			2,021
Financing Receivable, Recorded Investment, Current									2,014
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									4
Financing Receivable, Recorded Investment, Past Due		0		0		0			7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,295		2,295		2,295
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0			0
Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		8,752		8,752		8,752			9,103
Financing Receivable, Recorded Investment, Current									9,079
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									13
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									11
Financing Receivable, Recorded Investment, Past Due		24		24		24			24
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									2
Term [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		8,728		8,728		8,728
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16		16		16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8		8		8
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3		3		3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32		32			25
Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,047		11,047		11,047			11,124
Financing Receivable, Recorded Investment, Current		11,023		11,023		11,023			11,093
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16		16		16			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8		8		8			15
Financing Receivable, Recorded Investment, Past Due		24		24		24			31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3		3		3			2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32		32			25
Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,884		2,884		2,884			2,777
Financing Receivable, Recorded Investment, Current									2,763
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									5
Financing Receivable, Recorded Investment, Past Due		12		12		12			14
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Home Equity Line of Credit [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,872		2,872		2,872
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		5		5		5
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		7		7		7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	4		4		4			5
One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		7,039		7,039		7,039			6,662
Financing Receivable, Recorded Investment, Current									6,621
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									25
Financing Receivable, Recorded Investment, Past Due		31		31		31			41
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									1
One Through Four Family Residential [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,008		7,008		7,008
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		15		15		15
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		16		16		16
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	23		23		23			27
Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		644		644		644			597
Financing Receivable, Recorded Investment, Current									590
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									6
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									1
Financing Receivable, Recorded Investment, Past Due		10		10		10			7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									1
Construction And Other Consumer Real Estate [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		634		634		634
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10		10		10
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0			0
Revolving Credit Facility [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		483		483		483			509
Financing Receivable, Recorded Investment, Current									506
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									2
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									1
Financing Receivable, Recorded Investment, Past Due		5		5		5			3
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									1
Revolving Credit Facility [Member] | Bankcard And Other Revolving Plans [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		478		478		478
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3		3		3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		2		2		2
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0			0
Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		114		114		114			139
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2	0	2	0
Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		1		1		1			2
Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		40		40		40			36
Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		26		26		26			47
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		54		54		54			53
Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		14		14		14			16
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1			2
Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		20		20		20			23
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		13		13		13			14
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		204		204		204			226
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1			1
Nonaccruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		10		10		10			8
Nonaccruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		58		58		58			62
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		90		90		90			87
Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		11		11		11			9
Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		10		10		10			5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0
Nonaccruing [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment				0
Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		10		10		10			10
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	$ 0	1	$ 1
Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		10		10		10			5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Outstanding Loan Balances [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		201		201		201
Financing Receivable, Collectively Evaluated for Impairment		23,338		23,338		23,338
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment		0		0		0			14
Outstanding Loan Balances [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		74		74		74
Financing Receivable, Collectively Evaluated for Impairment		11,150		11,150		11,150
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment		0		0		0			6
Outstanding Loan Balances [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		65		65		65
Financing Receivable, Collectively Evaluated for Impairment		10,982		10,982		10,982
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment		0		0		0			7
Pass [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		44,588		44,588		44,588			42,987
Pass [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		13,416		13,416		13,416			13,001
Leases Receivable, Gross, Commercial, Lease Financing		318		318		318			342
Commercial Lending Loans - Owner Occupied		7,253		7,253		7,253			6,920
Loans and Leases Receivable, Gross, Commercial, Governments		1,536		1,536		1,536			1,257
Loans and Leases Receivable, before Fees, Gross		22,523		22,523		22,523			21,520
Pass [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		11,150		11,150		11,150			10,649
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,866		2,866		2,866			2,759
Loans and Leases Receivable, Gross, Consumer, Mortgage		6,988		6,988		6,988			6,602
Loans and Leases Receivable, Gross, Consumer, Construction		642		642		642			596
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		480		480		480			507
Loans and Leases Receivable, Gross, Consumer, Other		174		174		174			185
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development									2,002
Commercial Real Estate Term Loans		8,631		8,631		8,631			8,816
Loans Receivable, Gross, Commercial, Real Estate		10,915		10,915		10,915			10,818
Pass [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,284		2,284		2,284
Special Mention [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		438		438		438			660
Special Mention [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		311		311		311			395
Leases Receivable, Gross, Commercial, Lease Financing		10		10		10			6
Commercial Lending Loans - Owner Occupied		84		84		84			93
Loans and Leases Receivable, Gross, Commercial, Governments		4		4		4			13
Loans and Leases Receivable, before Fees, Gross		409		409		409			507
Special Mention [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Construction		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Other		0		0		0			0
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development									15
Commercial Real Estate Term Loans		18		18		18			138
Loans Receivable, Gross, Commercial, Real Estate		29		29		29			153
Special Mention [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development		11		11		11
Substandard [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		784		784		784			1,132
Substandard [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		369		369		369			606
Leases Receivable, Gross, Commercial, Lease Financing		4		4		4			16
Commercial Lending Loans - Owner Occupied		211		211		211			275
Loans and Leases Receivable, Gross, Commercial, Governments		23		23		23			1
Loans and Leases Receivable, before Fees, Gross		607		607		607			898
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		74		74		74			81
Loans and Leases Receivable, Gross, Consumer, Home Equity		18		18		18			18
Loans and Leases Receivable, Gross, Consumer, Mortgage		51		51		51			60
Loans and Leases Receivable, Gross, Consumer, Construction		2		2		2			1
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		3		3		3			2
Loans and Leases Receivable, Gross, Consumer, Other		0		0		0			0
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development									4
Commercial Real Estate Term Loans		103		103		103			149
Loans Receivable, Gross, Commercial, Real Estate		103		103		103			153
Substandard [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development		0		0		0
Doubtful [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		0		0		0			1
Doubtful [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0		0			1
Leases Receivable, Gross, Commercial, Lease Financing		0		0		0			0
Commercial Lending Loans - Owner Occupied		0		0		0			0
Loans and Leases Receivable, Gross, Commercial, Governments		0		0		0			0
Loans and Leases Receivable, before Fees, Gross		0		0		0			1
Doubtful [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Construction		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Other		0		0		0			0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development									0
Commercial Real Estate Term Loans		0		0		0			0
Loans Receivable, Gross, Commercial, Real Estate		0		0		0			0
Doubtful [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development		0		0		0
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		480		480		480			518
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		51		51		51
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		314		314		314			371
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross									44
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial, Real Estate		115		115		115			103
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		202		202		202			243
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		1		1		1			1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		1		1		1			1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		33		33		33			28
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		72		72		72			80
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		12		12		12			13
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		46		46		46			43
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0		0		0			1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		44		44		44			40
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0		0		0			4
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		39		39		39			79
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		44		44		44			36
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0		0		0
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0		0		0
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		26		26		26
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		2		2		2
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0		0		0
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		1		1		1
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		21		21		21
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		5		5		5
Impaired Financing Receivable Related Allowance [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		102		102		102			218
Impaired Financing Receivable Related Allowance [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									0
Impaired Financing Receivable Related Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									1
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									29
Impaired Financing Receivable Related Allowance [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		47		47		47			142
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									9
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		28		28		28			39
Impaired Financing Receivable Related Allowance [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									0
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		6		6		6			14
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									2
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									23
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									12
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	18		18		18			22
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	2		2		2			3
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	0		0		0			0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]								0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]								7
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]								0
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	36		36		36			52
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	18		18		18			30
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	1		1		1			1
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	4		4		4			0
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]								1
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]								0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	[2]	0		0		0			0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[2]	2		2		2			2
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[2]	15		15		15			12
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[2]	0		0		0			1
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	0		0		0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	1		1		1
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	0		0		0
Multiple Modification Types [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	64		64		64			86
Multiple Modification Types [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	34		34		34			30
Multiple Modification Types [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	7		7		7			9
Multiple Modification Types [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								2
Multiple Modification Types [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								14
Multiple Modification Types [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								7
Multiple Modification Types [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	117		117		117			123
Multiple Modification Types [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Multiple Modification Types [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	53		53		53			37
Multiple Modification Types [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	8		8		8			5
Multiple Modification Types [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	1		1		1			3
Multiple Modification Types [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								5
Multiple Modification Types [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								3
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	[3]	1		1		1			1
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[3]	30		30		30			26
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[3]	7		7		7			33
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[3]	3		3		3			3
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	1		1		1
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	16		16		16
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	6		6		6
Interest Rate Below Market [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		6		6		6			8
Interest Rate Below Market [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1			1
Interest Rate Below Market [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4		4			6
Interest Rate Below Market [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Interest Rate Below Market [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1
Interest Rate Below Market [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									6
Interest Rate Below Market [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		10		10		10			11
Interest Rate Below Market [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Interest Rate Below Market [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4		4			3
Interest Rate Below Market [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0			0
Interest Rate Below Market [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3		3			2
Interest Rate Below Market [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1
Interest Rate Below Market [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									2
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0		0			0
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		1		1		1			1
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0		0			0
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0		0			0
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4		4
Maturity Or Team Extension [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		11		11		11			6
Maturity Or Team Extension [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3		3			3
Maturity Or Team Extension [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2		2			0
Maturity Or Team Extension [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Maturity Or Team Extension [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1
Maturity Or Team Extension [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Maturity Or Team Extension [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		19		19		19			12
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		8		8		8			6
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0			0
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0			0
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									2
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0		0			1
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		1		1		1			0
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		4		4		4			2
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		2		2		2			2
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2		2
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2		2
Principal Forgiveness [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		14		14		14			15
Principal Forgiveness [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		14		14		14			15
Principal Forgiveness [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0			0
Principal Forgiveness [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		17		17		17			23
Principal Forgiveness [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3		3			8
Principal Forgiveness [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2		2			3
Principal Forgiveness [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0			0
Principal Forgiveness [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0		0			0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		6		6		6			6
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0		0			0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		8		8		8			9
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0
Payment Deferral [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1			2
Payment Deferral [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0			1
Payment Deferral [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1			1
Payment Deferral [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Payment Deferral [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Payment Deferral [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1
Payment Deferral [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		5		5		5			5
Payment Deferral [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Payment Deferral [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4		4			3
Payment Deferral [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0			0
Payment Deferral [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2		2			0
Payment Deferral [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1
Payment Deferral [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0		0			0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0		0			1
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0		0			0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0		0			$ 0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		$ 1		$ 1		$ 1

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

[2] 1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

[3] 2 Includes TDRs that resulted from a combination of any of the previous modification types.

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Loans And Allowance For Credit Losses (Summary Of Major Portfolio Segment And Specific Loan Class) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at end of period	$ 480	$ 541	$ 480	$ 541
Loans held for sale	61		61			$ 44
Commercial and industrial	14,096		14,096			14,003
Leasing	332		332			364
Owner occupied	7,548		7,548			7,288
Municipal	1,563		1,563			1,271
Land Development Loans, Loans Receivable Commercial Construction and Land Development	2,295		2,295			2,021
Term	8,752		8,752			9,103
Provision for loan losses	11	(5)	46	(35)
Allowance for Loan and Lease Losses, Write-offs	17	25	56	117
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	18	17	64	56
Net loan and lease charge-offs	(1)	8	(8)	61
Reserve for unfunded lending commitments	58	59	58	59	$ 58	58	$ 63	$ 65
Provision for Unfunded Lending Commitments (decrease)	0	(4)	0	(6)
Allowance for loan and lease losses and reserve for unfunded lending commitments	538	$ 600	538	$ 600
Loans Receivable, Gross, Commercial, Real Estate	11,047		11,047			11,124
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,884		2,884			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage	7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction	644		644			597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	483		483			509
Loans and Leases Receivable, Gross, Consumer, Other	174		174			185
Loans and Leases Receivable, Gross	45,810		45,810			44,780
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross	23,539		23,539			22,926
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross	$ 11,224		$ 11,224			$ 10,730

XML

Loans And Allowance For Credit Losses (Summary Of Changes In The Allowance For Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	$ 11	$ (5)	$ 46	$ (35)
Allowance for Loan and Lease Losses, Write-offs	17	25	56	117
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	490	544	518	567
Allowance for Loan and Lease Losses, Adjustments, Other	(1)	8	(8)	61
Balance at end of period	58	59	58	59
Allowance for loan losses	490	544	518	567	$ 480	$ 490	$ 518	$ 541	$ 544	$ 567
Reserve for unfunded lending commitments	58	59	58	59	58	58	58	59	63	65
Allowance for loan and lease losses and reserve for unfunded lending commitments					538			600
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	18	17	64	56
Provision for Unfunded Lending Commitments (decrease)	0	(4)	0	(6)
Balance at end of period	480	541	480	541
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	11	4	69	(27)
Allowance for Loan and Lease Losses, Write-offs	8	16	38	98
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	321	393	371	420
Allowance for Loan and Lease Losses, Adjustments, Other	(4)	4	(12)	62
Balance at end of period	42	49	42	49
Allowance for loan losses	321	393	371	420	314	321	371	385	393	420
Reserve for unfunded lending commitments	42	49	42	49	42	43	48	49	53	54
Allowance for loan and lease losses and reserve for unfunded lending commitments					356			434
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	12	12	50	36
Provision for Unfunded Lending Commitments (decrease)	(1)	(4)	(6)	(5)
Balance at end of period	314	385	314	385
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	5	7	(9)	15
Allowance for Loan and Lease Losses, Write-offs	5	4	5	6
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	122	116	103	116
Allowance for Loan and Lease Losses, Adjustments, Other	2	2	(3)	(6)
Balance at end of period	16	10	16	10
Allowance for loan losses	122	116	103	116	115	122	103	107	116	116
Reserve for unfunded lending commitments	16	10	16	10	16	15	10	10	10	11
Allowance for loan and lease losses and reserve for unfunded lending commitments					131			117
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	3	2	8	12
Provision for Unfunded Lending Commitments (decrease)	1	0	6	(1)
Balance at end of period	115	107	115	107
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(5)	(16)	(14)	(23)
Allowance for Loan and Lease Losses, Write-offs	4	5	13	13
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	47	35	44	31
Allowance for Loan and Lease Losses, Adjustments, Other	1	2	7	5
Balance at end of period	0	0	0	0
Allowance for loan losses	47	35	44	31	51	47	44	49	35	31
Reserve for unfunded lending commitments	0	0	0	0	0	$ 0	$ 0	0	$ 0	$ 0
Allowance for loan and lease losses and reserve for unfunded lending commitments					$ 51			$ 49
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	3	3	6	8
Provision for Unfunded Lending Commitments (decrease)	0	0	0	0
Balance at end of period	$ 51	$ 49	$ 51	$ 49

XML

Loans And Allowance For Credit Losses (Summary Of ALLL And Outstanding Loan Balances According To The Company's Impairment Method) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 299	$ 601	$ 273	$ 559
Impaired Financing Receivable, Interest Income, Accrual Method	0	5	9	23
Allowance for loan losses: Individually evaluated for impairment	(14)		(14)			$ (31)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	466		466			487
Financing Receivable, Individually Evaluated for Impairment	340		340			459
Financing Receivable, Collectively Evaluated for Impairment	45,470		45,470			44,294
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	0		0			27
Loans and Leases Receivable, Gross	45,810		45,810			44,780
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	480	541	480	541	$ 490	518	$ 544	$ 567
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	51	104	46	101
Impaired Financing Receivable, Interest Income, Accrual Method	0	2	8	5
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(10)		(10)			(26)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	304		304			345
Financing Receivable, Individually Evaluated for Impairment						314
Financing Receivable, Collectively Evaluated for Impairment						22,598
Loans and Leases Receivable, Gross	23,539		23,539			22,926
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	314	385	314	385	321	371	393	420
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1	10	1	11
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Allowance for loan losses: Individually evaluated for impairment	(1)		(1)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	114		114
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	115	107	115	107	122	103	116	116
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	0	1	0	1
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Allowance for loan losses: Individually evaluated for impairment	(3)		(3)			(4)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	48		48			40
Financing Receivable, Individually Evaluated for Impairment						76
Financing Receivable, Collectively Evaluated for Impairment						10,648
Loans and Leases Receivable, Gross	11,224		11,224			10,730
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	51	49	51	49	$ 47	44	$ 35	$ 31
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	176	461	155	413
Impaired Financing Receivable, Interest Income, Accrual Method	0	3	8	10
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	49	53	50	58
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	1	11
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	50	63	51	69
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	1	11
Allowance for loan losses: Individually evaluated for impairment						(1)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment						102
Financing Receivable, Individually Evaluated for Impairment						69
Financing Receivable, Collectively Evaluated for Impairment						11,048
Loans and Leases Receivable, Gross	11,047		11,047			11,124
Loans and Leases Receivable, Allowance	115		115			103
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	14	21	13	21
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	1
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	58	53	53	53
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	0	1
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1	2	1	2
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	73	77	67	77
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	0	2
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1	1	1	1
Impaired Financing Receivable, Interest Income, Accrual Method	0	$ 0	0	$ 0
Outstanding Loan Balances [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	201		201
Financing Receivable, Collectively Evaluated for Impairment	23,338		23,338
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	0		0			14
Outstanding Loan Balances [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	65		65
Financing Receivable, Collectively Evaluated for Impairment	10,982		10,982
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	0		0			7
Outstanding Loan Balances [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	74		74
Financing Receivable, Collectively Evaluated for Impairment	11,150		11,150
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	$ 0		$ 0			$ 6

XML

Loans And Allowance For Credit Losses (Summary Of Nonaccrual Loans) (Details) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	[1]	$ 165	$ 261
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		0	12
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		0	0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		2	8
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		66	90
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		1	1
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		181	294
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		46	36
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		46	40
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		13	13
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		47	55
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		0	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		61	68
Financing Receivables, Total [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		$ 288	$ 402

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

XML

Loans And Allowance For Credit Losses (Summary Of Past Due Loans (Accruing And Nonaccruing)) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 3	$ 1	$ 8	$ 2	$ 84
Financing Receivable, Recorded Investment, Current		45,588		45,588			$ 44,497
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		116		116			140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		106		106			143
Financing Receivable, Recorded Investment, Past Due		222		222			283
Loans and Leases Receivable, Gross		45,810		45,810			44,780
Accruing loans 90+ days past due		12		12			22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	165		165			261
Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1			0
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Financing Receivable, Recorded Investment, Nonaccrual Status		112		112			195
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		23,539		23,539			22,926
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Financing Receivable, Recorded Investment, Nonaccrual Status		181		181			294
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,224		11,224			10,730
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0			0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		61		61			68
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		2		2			8
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
Financing Receivable, Recorded Investment, Nonaccrual Status		66		66			90
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1			1
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status		46		46			36
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Loans and Leases Receivable, Gross		11,047		11,047			11,124
Financing Receivable, Recorded Investment, Nonaccrual Status		46		46			40
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		13		13			13
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		47		47			55
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0			0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,165		11,165			10,664
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		34		34			34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25		25			32
Financing Receivable, Recorded Investment, Past Due		59		59			66
Loans and Leases Receivable, Gross		11,224		11,224			10,730
Accruing loans 90+ days past due		1		1			3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	27		27			32
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							184
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							0
Financing Receivable, Recorded Investment, Past Due		1		1			1
Loans and Leases Receivable, Gross		174		174			185
Accruing loans 90+ days past due							0
Consumer Portfolio Segment [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		173		173
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		1		1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			0
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							506
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							2
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							1
Financing Receivable, Recorded Investment, Past Due		5		5			3
Loans and Leases Receivable, Gross		483		483			509
Accruing loans 90+ days past due							1
Revolving Credit Facility [Member] | Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		478		478
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3		3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		2		2
Accruing loans 90+ days past due		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			0
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							590
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							6
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							1
Financing Receivable, Recorded Investment, Past Due		10		10			7
Loans and Leases Receivable, Gross		644		644			597
Accruing loans 90+ days past due							1
Construction And Other Consumer Real Estate [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		634		634
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10		10
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			0
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							6,621
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							25
Financing Receivable, Recorded Investment, Past Due		31		31			41
Loans and Leases Receivable, Gross		7,039		7,039			6,662
Accruing loans 90+ days past due							1
One Through Four Family Residential [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,008		7,008
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		15		15
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		16		16
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	23		23			27
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							2,763
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							5
Financing Receivable, Recorded Investment, Past Due		12		12			14
Loans and Leases Receivable, Gross		2,884		2,884			2,777
Accruing loans 90+ days past due							0
Home Equity Line of Credit [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,872		2,872
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		5		5
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		7		7
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	4		4			5
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,023		11,023			11,093
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16		16			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8		8			15
Financing Receivable, Recorded Investment, Past Due		24		24			31
Loans and Leases Receivable, Gross		11,047		11,047			11,124
Accruing loans 90+ days past due		3		3			2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32			25
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							9,079
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							13
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							11
Financing Receivable, Recorded Investment, Past Due		24		24			24
Loans and Leases Receivable, Gross		8,752		8,752			9,103
Accruing loans 90+ days past due							2
Term [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		8,728		8,728
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16		16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8		8
Accruing loans 90+ days past due		3		3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32			25
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							2,014
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							4
Financing Receivable, Recorded Investment, Past Due		0		0			7
Loans and Leases Receivable, Gross		2,295		2,295			2,021
Accruing loans 90+ days past due							0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,295		2,295
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		23,400		23,400			22,740
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		66		66			90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		73		73			96
Financing Receivable, Recorded Investment, Past Due		139		139			186
Loans and Leases Receivable, Gross		23,539		23,539			22,926
Accruing loans 90+ days past due		8		8			17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	106		106			204
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							1,271
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							0
Financing Receivable, Recorded Investment, Past Due		0		0			0
Loans and Leases Receivable, Gross		1,563		1,563			1,271
Accruing loans 90+ days past due							0
Municipal [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		1,563		1,563
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1			1
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							7,219
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							29
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							40
Financing Receivable, Recorded Investment, Past Due		48		48			69
Loans and Leases Receivable, Gross		7,548		7,548			7,288
Accruing loans 90+ days past due							4
Owner Occupied [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,500		7,500
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		26		26
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		22		22
Accruing loans 90+ days past due		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	41		41			49
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							363
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							0
Financing Receivable, Recorded Investment, Past Due		1		1			1
Loans and Leases Receivable, Gross		332		332			364
Accruing loans 90+ days past due							0
Finance Leases Portfolio Segment [Member] | Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		331		331
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		1		1
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1			8
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							13,887
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							60
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							56
Financing Receivable, Recorded Investment, Past Due		90		90			116
Loans and Leases Receivable, Gross		14,096		14,096			14,003
Accruing loans 90+ days past due							13
Commercial And Industrial [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		14,006		14,006
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		40		40
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		50		50
Accruing loans 90+ days past due		6		6
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	63		63			146
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		61		61			44
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0			0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0			0
Financing Receivable, Recorded Investment, Past Due		0		0			0
Loans and Leases Receivable, Gross		61		61			44
Accruing loans 90+ days past due		0		0			0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			$ 12
Accruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2	0	2	0
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2
Nonaccruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	$ 0	1	$ 1
Nonaccruing [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		$ 0
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 0

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

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Loans And Allowance For Credit Losses (Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 3	$ 1	$ 8	$ 2	$ 84
Financing Receivable, Recorded Investment, Current		45,588		45,588			$ 44,497
Loans held for sale		61		61			44
Commercial and industrial		14,096		14,096			14,003
Leasing		332		332			364
Owner occupied		7,548		7,548			7,288
Municipal		1,563		1,563			1,271
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,295		2,295			2,021
Term		8,752		8,752			9,103
Loans Receivable, Gross, Commercial, Real Estate		11,047		11,047			11,124
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884			2,777
1-4 family residential		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644			597
Bankcard and other revolving plans		483		483			509
Other		174		174			185
Loans and Leases Receivable, Gross		45,810		45,810			44,780
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		116		116			140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		106		106			143
Financing Receivable, Recorded Investment, Past Due		222		222			283
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		12		12			22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	165		165			261
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		11,224		11,224			10,730
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884			2,777
1-4 family residential		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644			597
Bankcard and other revolving plans		483		483			509
Other		174		174			185
Loans and Leases Receivable, Gross		11,224		11,224			10,730
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0			0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development							2,021
Term		8,752		8,752			9,103
Loans Receivable, Gross, Commercial, Real Estate		11,047		11,047			11,124
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		14,096		14,096			14,003
Leasing		332		332			364
Owner occupied		7,548		7,548			7,288
Municipal		1,563		1,563			1,271
Loans and Leases Receivable, before Fees, Gross		23,539		23,539			22,926
Loans and Leases Receivable, Gross		23,539		23,539			22,926
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		44,588		44,588			42,987
Pass [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		11,150		11,150			10,649
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,866		2,866			2,759
1-4 family residential		6,988		6,988			6,602
Loans and Leases Receivable, Gross, Consumer, Construction		642		642			596
Bankcard and other revolving plans		480		480			507
Other		174		174			185
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development							2,002
Term		8,631		8,631			8,816
Loans Receivable, Gross, Commercial, Real Estate		10,915		10,915			10,818
Pass [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		13,416		13,416			13,001
Leasing		318		318			342
Owner occupied		7,253		7,253			6,920
Municipal		1,536		1,536			1,257
Loans and Leases Receivable, before Fees, Gross		22,523		22,523			21,520
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		438		438			660
Special Mention [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0		0			0
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
1-4 family residential		0		0			0
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			0
Bankcard and other revolving plans		0		0			0
Other		0		0			0
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development							15
Term		18		18			138
Loans Receivable, Gross, Commercial, Real Estate		29		29			153
Special Mention [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		311		311			395
Leasing		10		10			6
Owner occupied		84		84			93
Municipal		4		4			13
Loans and Leases Receivable, before Fees, Gross		409		409			507
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		480		480			518
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross							44
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Receivable, Gross, Commercial, Real Estate		115		115			103
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		314		314			371
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		0		0			1
Doubtful [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0		0			0
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
1-4 family residential		0		0			0
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			0
Bankcard and other revolving plans		0		0			0
Other		0		0			0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development							0
Term		0		0			0
Loans Receivable, Gross, Commercial, Real Estate		0		0			0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		0		0			1
Leasing		0		0			0
Owner occupied		0		0			0
Municipal		0		0			0
Loans and Leases Receivable, before Fees, Gross		0		0			1
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		784		784			1,132
Substandard [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		74		74			81
Loans and Leases Receivable, Gross, Consumer, Home Equity		18		18			18
1-4 family residential		51		51			60
Loans and Leases Receivable, Gross, Consumer, Construction		2		2			1
Bankcard and other revolving plans		3		3			2
Other		0		0			0
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development							4
Term		103		103			149
Loans Receivable, Gross, Commercial, Real Estate		103		103			153
Substandard [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		369		369			606
Leasing		4		4			16
Owner occupied		211		211			275
Municipal		23		23			1
Loans and Leases Receivable, before Fees, Gross		607		607			898
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		61		61			44
Loans and Leases Receivable, Gross		61		61			44
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0			0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0			0
Financing Receivable, Recorded Investment, Past Due		0		0			0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0			0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			12
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							13,887
Loans and Leases Receivable, Gross		14,096		14,096			14,003
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							60
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							56
Financing Receivable, Recorded Investment, Past Due		90		90			116
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							13
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,165		11,165			10,664
Loans and Leases Receivable, Gross		11,224		11,224			10,730
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		34		34			34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25		25			32
Financing Receivable, Recorded Investment, Past Due		59		59			66
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1			3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	27		27			32
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							184
Loans and Leases Receivable, Gross		174		174			185
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							0
Financing Receivable, Recorded Investment, Past Due		1		1			1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							0
Consumer Portfolio Segment [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		173		173
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		1		1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			0
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							9,079
Loans and Leases Receivable, Gross		8,752		8,752			9,103
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							13
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							11
Financing Receivable, Recorded Investment, Past Due		24		24			24
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							2
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							2,014
Loans and Leases Receivable, Gross		2,295		2,295			2,021
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							4
Financing Receivable, Recorded Investment, Past Due		0		0			7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,295		2,295
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							363
Loans and Leases Receivable, Gross		332		332			364
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							0
Financing Receivable, Recorded Investment, Past Due		1		1			1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							0
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							7,219
Loans and Leases Receivable, Gross		7,548		7,548			7,288
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							29
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							40
Financing Receivable, Recorded Investment, Past Due		48		48			69
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							4
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							1,271
Loans and Leases Receivable, Gross		1,563		1,563			1,271
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							0
Financing Receivable, Recorded Investment, Past Due		0		0			0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,023		11,023			11,093
Loans and Leases Receivable, Gross		11,047		11,047			11,124
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16		16			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8		8			15
Financing Receivable, Recorded Investment, Past Due		24		24			31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3		3			2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32			25
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							2,763
Loans and Leases Receivable, Gross		2,884		2,884			2,777
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							5
Financing Receivable, Recorded Investment, Past Due		12		12			14
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		23,400		23,400			22,740
Loans and Leases Receivable, Gross		23,539		23,539			22,926
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		66		66			90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		73		73			96
Financing Receivable, Recorded Investment, Past Due		139		139			186
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		8		8			17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	106		106			204
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							6,621
Loans and Leases Receivable, Gross		7,039		7,039			6,662
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							25
Financing Receivable, Recorded Investment, Past Due		31		31			41
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							1
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							590
Loans and Leases Receivable, Gross		644		644			597
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							6
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							1
Financing Receivable, Recorded Investment, Past Due		$ 10		$ 10			7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							$ 1

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

XML

Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$ 2,884		$ 2,884		$ 2,777
Unpaid principal balance	385		385		573
Impaired Financing Receivable, Recorded Investment	304		304		461
Impaired Financing Receivable, Related Allowance	13		13		30
Average recorded investment	299	$ 601	273	$ 559
Interest income recognized	0	5	9	23
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	170		170		293
Impaired Financing Receivable, Recorded Investment	119		119
Impaired Financing Receivable, Related Allowance	8		8		24
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	66		66		120
Impaired Financing Receivable, Recorded Investment	60		60		102
Impaired Financing Receivable, Related Allowance	2		2		2
Average recorded investment	51	104	46	101
Interest income recognized	0	2	8	5
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1		1		1
Impaired Financing Receivable, Recorded Investment	1		1		1
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	1	1	1	1
Interest income recognized	0	0	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	237		237		414
Impaired Financing Receivable, Recorded Investment	180		180		325
Impaired Financing Receivable, Related Allowance	10		10		26
Average recorded investment	176	461	155	413
Interest income recognized	0	3	8	10
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					6
Average recorded investment	1	10	1	11
Interest income recognized	0	0	0	0
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	59		59		56
Impaired Financing Receivable, Recorded Investment	49		49		48
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	49	53	50	58
Interest income recognized	0	1	1	11
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	60		60		64
Impaired Financing Receivable, Recorded Investment	50		50		54
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	50	63	51	69
Interest income recognized	0	1	1	11
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	16		16		25
Impaired Financing Receivable, Recorded Investment	14		14		22
Impaired Financing Receivable, Related Allowance	3		3		0
Average recorded investment	14	21	13	21
Interest income recognized	0	0	0	1
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,884		2,884		2,777
Unpaid principal balance	0		0		1
Impaired Financing Receivable, Recorded Investment	0		0		1
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	0	1	0	1
Interest income recognized	0	0	0	0
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	70		70		67
Impaired Financing Receivable, Recorded Investment	59		59		57
Impaired Financing Receivable, Related Allowance	0		0		4
Average recorded investment	58	53	53	53
Interest income recognized	0	1	0	1
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	2		2		2
Impaired Financing Receivable, Recorded Investment	1		1		2
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	1	2	1	2
Interest income recognized	0	0	0	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	88		88		95
Impaired Financing Receivable, Recorded Investment	74		74		82
Impaired Financing Receivable, Related Allowance	3		3		4
Average recorded investment	73	77	67	77
Interest income recognized	0	1	0	2
Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	102		102		218
Impaired Financing Receivable Related Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	47		47		142
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					23
Impaired Financing Receivable Related Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					0
Impaired Financing Receivable Related Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	68		68		165
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					12
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	6		6		14
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					9
Impaired Financing Receivable Related Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					0
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					29
Impaired Financing Receivable Related Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					1
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	28		28		39
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	202		202		243
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	72		72		80
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	39		39		79
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	1		1		1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	112		112		160
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	44		44		36
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	44		44		40
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	12		12		13
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	0		0		1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	33		33		28
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	1		1		1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	46		46		43
Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					$ 222
Average recorded investment	124	356
Interest income recognized	$ 0	$ 1
Commercial and Industrial Sector [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average recorded investment			108	311
Interest income recognized			$ 0	$ 5

XML

Loans And Allowance For Credit Losses (Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 3	$ 1	$ 8	$ 2	$ 84
1-4 family residential		7,039		7,039			$ 6,662
Construction and other consumer real estate		644		644			597
Commercial and industrial		14,096		14,096			14,003
Home equity credit line		2,884		2,884			2,777
Bankcard and other revolving plans		483		483			509
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		7,039		7,039			6,662
Construction and other consumer real estate		644		644			597
Home equity credit line		2,884		2,884			2,777
Bankcard and other revolving plans		483		483			509
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2	0	2	0
Recorded investment resulting from the following modification types		114		114			139
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Commercial and industrial		26		26			47
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Recorded investment resulting from the following modification types		20		20			23
Commercial Municipal Loans		0		0
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Recorded investment resulting from the following modification types		46		46			70
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1			2
Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Recorded investment resulting from the following modification types		13		13			14
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2
Recorded investment resulting from the following modification types		14		14			16
Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		13		13			15
Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		40		40			36
Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		1		1			2
Accruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		54		54			53
Accruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		6		6			8
Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							1
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1			1
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Accruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							6
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4			6
Accruing [Member] | Interest Rate Below Market [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1			1
Accruing [Member] | Maturity Or Team Extension [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		11		11			6
Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							1
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		6		6			3
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Accruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2			0
Accruing [Member] | Maturity Or Team Extension [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3		3			3
Accruing [Member] | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		14		14			15
Accruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Accruing [Member] | Principal Forgiveness [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			0
Accruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Accruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Accruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			0
Accruing [Member] | Principal Forgiveness [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		14		14			15
Accruing [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1			2
Accruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Accruing [Member] | Payment Deferral [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			0
Accruing [Member] | Payment Deferral [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Accruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							1
Accruing [Member] | Payment Deferral [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1			1
Accruing [Member] | Payment Deferral [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			1
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	18		18			22
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]						7
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	16		16			19
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]						0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]						0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	0		0			0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	2		2			3
Accruing [Member] | Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	64		64			86
Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]						14
Accruing [Member] | Multiple Modification Types [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	23		23			47
Accruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]						2
Accruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]						7
Accruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	7		7			9
Accruing [Member] | Multiple Modification Types [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	34		34			30
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Recorded investment resulting from the following modification types		204		204			226
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Commercial and industrial		58		58			62
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
Recorded investment resulting from the following modification types		10		10			10
Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1			1
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	$ 1	6	$ 2
Recorded investment resulting from the following modification types		69		69			73
Nonaccruing [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment				0
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Recorded investment resulting from the following modification types		10		10			5
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0
Recorded investment resulting from the following modification types		10		10			5
Nonaccruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		1		1			1
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		10		10			8
Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		11		11			9
Nonaccruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		90		90			87
Nonaccruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		10		10			11
Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							1
Nonaccruing [Member] | Interest Rate Below Market [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1			1
Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							2
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3		3			2
Nonaccruing [Member] | Interest Rate Below Market [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4			3
Nonaccruing [Member] | Maturity Or Team Extension [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		19		19			12
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							2
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							1
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		8		8			6
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		8		8			6
Nonaccruing [Member] | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		17		17			23
Nonaccruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Nonaccruing [Member] | Principal Forgiveness [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1			5
Nonaccruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			0
Nonaccruing [Member] | Principal Forgiveness [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2			3
Nonaccruing [Member] | Principal Forgiveness [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3		3			8
Nonaccruing [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		5		5			5
Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							1
Nonaccruing [Member] | Payment Deferral [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2			3
Nonaccruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2			0
Nonaccruing [Member] | Payment Deferral [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			0
Nonaccruing [Member] | Payment Deferral [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4			3
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	36		36			52
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]						1
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	13		13			29
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]						0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	4		4			0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1		1			1
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	18		18			30
Nonaccruing [Member] | Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	117		117			123
Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]						5
Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	44		44			29
Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]						3
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	1		1			3
Nonaccruing [Member] | Multiple Modification Types [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	8		8			5
Nonaccruing [Member] | Multiple Modification Types [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	53		53			37
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		0		0			0
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1
Commercial Municipal Loans		0		0
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		1		1			1
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0			0
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0			0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		4		4			2
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2
Commercial Municipal Loans		0		0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		1		1			0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0			1
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		2		2			2
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		0		0			0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Commercial Municipal Loans		0		0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		6		6			6
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0			0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		8		8			9
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		0		0			0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Commercial Municipal Loans		0		0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		0		0			1
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0			0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0			0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[1]	15		15			12
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1		1
Commercial Municipal Loans		0		0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	0		0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[1]	2		2			2
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	[1]	0		0			0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[1]	0		0			1
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[2]	7		7			33
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	16		16
Commercial Municipal Loans		0		0
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	6		6
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[2]	30		30			26
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	[2]	1		1			1
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[2]	3		3			3
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3		3
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		6		6			3
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		1		1			5
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		1		1			2
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		1		1			1
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		1		1			2
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[1]	12		12			28
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1		1
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	4		4
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[1]	1		1			1
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[1]	0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[2]	38		38			24
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	5		5
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	1		1
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[2]	8		8			5
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[2]	$ 0		$ 0			$ 0

[1] 1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

[2] 2 Includes TDRs that resulted from a combination of any of the previous modification types.

XML

Loans And Allowance For Credit Losses (Summary Of Net Financial Impact On Interest Income Due To Interest Rate Modifications Below Market For Accruing TDR Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3	$ 1	$ 8	$ 2	$ 84
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,884		2,884			$ 2,777
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,884		2,884			$ 2,777
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	1	1
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	1	6	2
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2		2
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2		2
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	1	6	2
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	1	1
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	1	6	2
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2	0	2	0
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	$ 0	0	$ 0
Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2		$ 2
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2

XML

Loans And Allowance For Credit Losses (Schedule Of Investment Of Accruing And Nonaccruing Loans Modified As Troubled Debt Restructurings) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		$ 14,096		$ 14,096			$ 14,003
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3	$ 1	8	$ 2	$ 84
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644			597
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2	0	2	0
Financing Receivable, Modifications, Recorded Investment		114		114			139
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Financing Receivable, Modifications, Recorded Investment		204		204			226
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		26		26			47
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		58		58			62
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Financing Receivable, Modifications, Recorded Investment		20		20			23
Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
Financing Receivable, Modifications, Recorded Investment		10		10			10
Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1			1
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Financing Receivable, Modifications, Recorded Investment		46		46			70
Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	$ 1	6	$ 2
Financing Receivable, Modifications, Recorded Investment		69		69			73
Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1			2
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Financing Receivable, Modifications, Recorded Investment		13		13			14
Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Financing Receivable, Modifications, Recorded Investment		10		10			5
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2
Financing Receivable, Modifications, Recorded Investment		14		14			16
Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0
Financing Receivable, Modifications, Recorded Investment		10		10			5
Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		13		13			15
Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		1		1			1
One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		40		40			36
One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		10		10			8
Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		1		1			2
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644			597
Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		11		11			9
Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		54		54			53
Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		90		90			87
Interest Rate Below Market [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6		6			8
Interest Rate Below Market [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		10		10			11
Interest Rate Below Market [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							1
Interest Rate Below Market [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							1
Interest Rate Below Market [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Interest Rate Below Market [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1			1
Interest Rate Below Market [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1			1
Interest Rate Below Market [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Interest Rate Below Market [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							6
Interest Rate Below Market [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							2
Interest Rate Below Market [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4			6
Interest Rate Below Market [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3			2
Interest Rate Below Market [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0			0
Interest Rate Below Market [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1			1
Interest Rate Below Market [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4			3
Maturity Or Team Extension [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		11		11			6
Maturity Or Team Extension [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		19		19			12
Maturity Or Team Extension [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							1
Maturity Or Team Extension [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							2
Maturity Or Team Extension [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							1
Maturity Or Team Extension [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6		6			3
Maturity Or Team Extension [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		8		8			6
Maturity Or Team Extension [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Maturity Or Team Extension [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Maturity Or Team Extension [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Maturity Or Team Extension [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2			0
Maturity Or Team Extension [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0			0
Maturity Or Team Extension [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0			0
Maturity Or Team Extension [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3			3
Maturity Or Team Extension [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		8		8			6
Principal Forgiveness [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		14		14			15
Principal Forgiveness [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		17		17			23
Principal Forgiveness [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Principal Forgiveness [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Principal Forgiveness [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Principal Forgiveness [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0			0
Principal Forgiveness [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1			5
Principal Forgiveness [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Principal Forgiveness [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Principal Forgiveness [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Principal Forgiveness [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0			0
Principal Forgiveness [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0			0
Principal Forgiveness [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2			3
Principal Forgiveness [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		14		14			15
Principal Forgiveness [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3			8
Payment Deferral [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1			2
Payment Deferral [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		5		5			5
Payment Deferral [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Payment Deferral [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							1
Payment Deferral [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Payment Deferral [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0			0
Payment Deferral [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2			3
Payment Deferral [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Payment Deferral [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							1
Payment Deferral [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Payment Deferral [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1			1
Payment Deferral [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2			0
Payment Deferral [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0			0
Payment Deferral [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0			1
Payment Deferral [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4			3
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	18		18			22
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	36		36			52
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]						7
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]						1
Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	16		16			19
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	13		13			29
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]						0
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]						0
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]						0
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	0		0			0
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	4		4			0
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1		1			1
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	2		2			3
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	18		18			30
Multiple Modification Types [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	64		64			86
Multiple Modification Types [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	117		117			123
Multiple Modification Types [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]						14
Multiple Modification Types [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]						5
Multiple Modification Types [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							0
Multiple Modification Types [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	23		23			47
Multiple Modification Types [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	44		44			29
Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]						2
Multiple Modification Types [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]						7
Multiple Modification Types [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]						3
Multiple Modification Types [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	7		7			9
Multiple Modification Types [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	1		1			3
Multiple Modification Types [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	8		8			5
Multiple Modification Types [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	34		34			30
Multiple Modification Types [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	53		53			37
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0			0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1
Nonaccruing [Member] | Interest Rate Below Market [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3
Nonaccruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
Nonaccruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		6		6			3
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0			0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		1		1			5
Nonaccruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Nonaccruing [Member] | Principal Forgiveness [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Nonaccruing [Member] | Principal Forgiveness [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		1		1			1
Nonaccruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		1		1			2
Nonaccruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		1		1			2
Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1
Nonaccruing [Member] | Payment Deferral [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Nonaccruing [Member] | Payment Deferral [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2
Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
Nonaccruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0			0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[1]	12		12			28
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1		1
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	4		4
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[1]	0		0			0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[1]	1		1			1
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[2]	38		38			24
Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	5		5
Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1
Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	1		1
Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[2]	0		0			0
Nonaccruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[2]	8		8			5
Accruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0			0
Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1
Accruing [Member] | Interest Rate Below Market [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4
Accruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
Accruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		1		1			1
Accruing [Member] | Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			0
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		4		4			2
Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2
Accruing [Member] | Maturity Or Team Extension [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2
Accruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		2		2			2
Accruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		1		1			0
Accruing [Member] | Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			1
Accruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0			0
Accruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Accruing [Member] | Principal Forgiveness [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Accruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		8		8			9
Accruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		6		6			6
Accruing [Member] | Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			0
Accruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0			0
Accruing [Member] | Payment Deferral [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Accruing [Member] | Payment Deferral [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1
Accruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
Accruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0			1
Accruing [Member] | Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[1]	15		15			12
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1		1
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	0		0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[1]	0		0			1
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[1]	2		2			2
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	[1]	0		0			0
Accruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[2]	7		7			33
Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	16		16
Accruing [Member] | Multiple Modification Types [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	6		6
Accruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[2]	3		3			3
Accruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[2]	30		30			26
Accruing [Member] | Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	[2]	$ 1		$ 1			$ 1

[1] 1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

[2] 2 Includes TDRs that resulted from a combination of any of the previous modification types.

XML

Loans And Allowance For Credit Losses (Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans) (Details) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		$ 222	$ 283
Financing Receivable, Recorded Investment, Current		45,588	44,497
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		116	140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		106	143
Loans and Leases Receivable, Gross		45,810	44,780
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		12	22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	165	261
loans held for sale [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		0	0
Financing Receivable, Recorded Investment, Current		61	44
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0	0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0	0
Loans and Leases Receivable, Gross		61	44
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0	12
Commercial And Industrial [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		90	116
Financing Receivable, Recorded Investment, Current			13,887
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			60
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			56
Loans and Leases Receivable, Gross		14,096	14,003
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			13
Finance Leases Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		1	1
Financing Receivable, Recorded Investment, Current			363
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			0
Loans and Leases Receivable, Gross		332	364
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
Owner Occupied [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		48	69
Financing Receivable, Recorded Investment, Current			7,219
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			29
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			40
Loans and Leases Receivable, Gross		7,548	7,288
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			4
Municipal [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		0	0
Financing Receivable, Recorded Investment, Current			1,271
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			0
Loans and Leases Receivable, Gross		1,563	1,271
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
Commercial Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		139	186
Financing Receivable, Recorded Investment, Current		23,400	22,740
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		66	90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		73	96
Loans and Leases Receivable, Gross		23,539	22,926
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		8	17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	106	204
Commercial Real Estate Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		0	7
Financing Receivable, Recorded Investment, Current			2,014
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			4
Loans and Leases Receivable, Gross		2,295	2,021
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
Term [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		24	24
Financing Receivable, Recorded Investment, Current			9,079
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			13
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			11
Loans and Leases Receivable, Gross		8,752	9,103
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			2
Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		24	31
Financing Receivable, Recorded Investment, Current		11,023	11,093
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16	16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8	15
Loans and Leases Receivable, Gross		11,047	11,124
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3	2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32	25
Home Equity Line of Credit [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		12	14
Financing Receivable, Recorded Investment, Current			2,763
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			5
Loans and Leases Receivable, Gross		2,884	2,777
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
One Through Four Family Residential [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		31	41
Financing Receivable, Recorded Investment, Current			6,621
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			25
Loans and Leases Receivable, Gross		7,039	6,662
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			1
Construction And Other Consumer Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		10	7
Financing Receivable, Recorded Investment, Current			590
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			6
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			1
Loans and Leases Receivable, Gross		644	597
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			1
Revolving Credit Facility [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		5	3
Financing Receivable, Recorded Investment, Current			506
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			2
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			1
Loans and Leases Receivable, Gross		483	509
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			1
Consumer Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		1	1
Financing Receivable, Recorded Investment, Current			184
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			0
Loans and Leases Receivable, Gross		174	185
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
Consumer Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		59	66
Financing Receivable, Recorded Investment, Current		11,165	10,664
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		34	34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25	32
Loans and Leases Receivable, Gross		11,224	10,730
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1	3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 27	$ 32

[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

XML

Derivative Instruments And Hedging Activities (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion				$ (6)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax		$ (1)	$ 0	(8)	$ 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(1)	0	(3)	3
Fair values of derivative assets reduced (increased) by net credit valuation adjustments		1	4	1	4
Total derivatives, Notional amount		7,119		7,119		$ 6,824
Cash collateral pledged for derivative liabilities		38		38
Additional collateral that would be required to be pledge if credit rating was downgraded by one notch		0		0
Derivative Instrument, Noninterest Income (Expense)		14	8	25	19
Derivatives Designated As Hedging Instrument Offset To Interest Expense		0	0	0	0
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities		2	1	2	1
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		1,213		1,213		1,138
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		5,906		5,906		5,686
Interest Rate Swap [Member] | Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax		(1)	0	(8)	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[1]	(1)	0	(3)	3
Total derivatives, Notional amount		713		713		1,138
Interest Rate Swap [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		237		237		223
Derivative Instrument, Noninterest Income (Expense)			0
Interest Rate Swaps For Customers [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		5,345		5,345		4,550
Derivative Instrument, Noninterest Income (Expense)		8	4	12	8
Foreign Exchange [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		324		324		913
Derivative Instrument, Noninterest Income (Expense)		6	$ 4	13	$ 12
Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		76		76		40
Other Liabilities [Member] | Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0		0
Other Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		76		76		40
Other Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Gross amounts recognized		76		76		40
Other Liabilities [Member] | Interest Rate Swap [Member] | Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0		0
Other Liabilities [Member] | Interest Rate Swap [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0		0
Other Liabilities [Member] | Interest Rate Swaps For Customers [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		73		73		33
Other Liabilities [Member] | Foreign Exchange [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		$ 3		$ 3		$ 7

[1] Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2018, we estimate that $(6) million will be reclassified from AOCI into interest income

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Derivative Instruments And Hedging Activities (Schedule Of Notional Amounts And Recorded Gross Fair Values And Related Gain (Loss) Of Derivative Instruments) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Long-term Debt		$ 879		$ 879		$ 383
Interest Rate Derivatives, at Fair Value, Net		$ 0	$ 0	$ 0	$ 0
Types of Items Hedged by Interest Rate Derivatives		1000000	0	1000000	0
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge		$ (1)	$ 0	$ (1)	$ 0
Total derivatives, Notional amount		7,119		7,119		6,824
Amount of derivative gain (loss), recognized in OCI		(1)	0	(8)	0
Amount of derivative gain (loss), Reclassified from AOCI to interest income		(1)	0	(3)	3
Derivatives instruments, Noninterest income (expense)		14	8	25	19
Derivatives designated as hedging instruments, Offset to interest expense		0	0	0	0
Long-term Debt [Member]
Derivative [Line Items]
Hedged Liability, Fair Value Hedge		(499)		(499)		0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)		1		1		0
Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		23		23		38
Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		76		76		40
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		1,213		1,213		1,138
Derivatives Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		0		0		0
Derivatives Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		0		0		0
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Total derivatives, Notional amount		713		713		1,138
Amount of derivative gain (loss), recognized in OCI		(1)	0	(8)	0
Amount of derivative gain (loss), Reclassified from AOCI to interest income	[1]	(1)	0	(3)	3
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Total derivatives, Notional amount		500		500		0
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Assets [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		0		0		0
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Assets [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		0		0		0
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		0		0		0
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		0		0		0
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		5,906		5,906		5,686
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		23		23		38
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		76		76		40
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Total derivatives, Notional amount		324		324		913
Derivatives instruments, Noninterest income (expense)		6	4	13	12
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		4		4		9
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		3		3		7
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Total derivatives, Notional amount		237		237		223
Derivatives instruments, Noninterest income (expense)			0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		1		1		1
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		0		0		0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Total derivatives, Notional amount		5,345		5,345		4,550
Derivatives instruments, Noninterest income (expense)		8	$ 4	12	$ 8
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		18		18		28
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		$ 73		$ 73		$ 33

[1] Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2018, we estimate that $(6) million will be reclassified from AOCI into interest income

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Debt And Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2018

Sep. 30, 2017

Dec. 31, 2017

Dec. 31, 2016

Debt And Shareholders' Equity [Line Items]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt is summarized as follows:

(In millions)	September 30, 2018		December 31, 2017
Subordinated notes	$	247	$	247
Senior notes	632		135
Capital lease obligations	—		1
Total	$	879	$	383

Subordinated Debt

$ 247,000,000

$ 247,000,000

$ 247,000,000

Other Comprehensive Income (Loss), before Reclassifications, Net of Tax

(224,000,000)

$ 67,000,000

Stockholders' Equity [Abstract]

Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax

(2,000,000)

2,000,000

Senior Notes

$ 632,000,000

$ 632,000,000

135,000,000

Debt Instrument, Interest Rate Terms

0.035

Debt Instrument, Call Feature

162000000

Common Stock, Par or Stated Value Per Share

$ 0.0010

$ 0.0010

Common Stock

$ 192,169

$ 192,169

4,445,000,000

Capital Lease Obligations

0

0

1,000,000

Long-term Debt, Gross

$ 879,000,000

$ 879,000,000

383,000,000

Stock Repurchased During Period, Shares

3.5

4.7

8.0

Repurchase of Bank Common Stock

$ 420,000,000

Stock Repurchased and Retired During Period, Value

$ 185,000,000

$ 205,000,000

$ (434,000,000)

(217,000,000)

Treasury Stock Acquired, Average Cost Per Share

$ 52.86

$ 43.72

$ 53.84

Stock Repurchase Program, Remaining Authorized Repurchase Amount

$ 250,000,000

$ 250,000,000

Net Shares Issued From Stock Warrant Exercises

1.3

Warrants Sold

3.9

Class of Warrant or Right, Outstanding

1.9

1.9

Warrant Exercise Price

$ 36.27

$ 36.27

Accumulated Other Comprehensive Income (Loss), Net of Tax

$ (361,000,000)

$ (57,000,000)

$ (361,000,000)

$ (57,000,000)

$ (139,000,000)

$ (122,000,000)

Warrant [Member]

Stockholders' Equity [Abstract]

Class of Warrant or Right, Outstanding

29.3

29.3

Warrant Exercise Price

$ 35.03

$ 35.03

Senior Notes [Member]

Stockholders' Equity [Abstract]

Senior Notes

$ 500,000,000

$ 500,000,000

XML

Debt And Shareholders' Equity Schedule of Long-Term Debt Instruments (Details) - USD ($)
shares in Millions, $ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2018

Sep. 30, 2018

Dec. 31, 2017

Debt Instrument [Line Items]

Net Shares Issued From Stock Warrant Exercises

1.3

Subordinated Debt

$ 247

$ 247

$ 247

Senior Notes

632

632

135

Capital Lease Obligations

0

0

1

Long-term Debt, Gross

$ 879

$ 879

$ 383

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt is summarized as follows:

(In millions)	September 30, 2018		December 31, 2017
Subordinated notes	$	247	$	247
Senior notes	632		135
Capital lease obligations	—		1
Total	$	879	$	383

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Debt And Shareholders' Equity (Schedule Of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax			$ (73)	$ 40
Income Tax Expense (Benefit)	$ 69	$ 83	195	207
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(224)	67
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			2	(2)
Beginning balance			(139)	(122)	$ (122)
Other comprehensive income (loss)	(45)	(8)	(222)	65
Ending balance	(361)	(57)	(361)	(57)	(139)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax			0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax			0	0
Other Comprehensive Income (Loss), Tax			(73)	40
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(221)	65
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
Beginning balance			(114)	(93)	(93)
Other comprehensive income (loss)			(221)	65
Ending balance	(335)	(28)	(335)	(28)	(114)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(3)	2
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			2	(2)
Beginning balance			(2)	2	2
Other comprehensive income (loss)			(1)	0
Ending balance	(3)	2	(3)	2	(2)
Accumulated Defined Benefit Plans Adjustment [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
Beginning balance			(23)	(31)	(31)
Other comprehensive income (loss)			0	0
Ending balance	(23)	(31)	(23)	$ (31)	(23)
Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Debt And Shareholders' Equity [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(1)	0	(3)		3
Reclassification from AOCI, Current Period, Tax	(1)	0	(2)		2
Income Tax Expense (Benefit)	$ 0	$ 0	$ (1)		$ 1

XML

Commitments, Guarantees, And Contingent Liabilities (Narrative) (Details) $ in Millions	Sep. 30, 2018 USD ($)
Guarantor Obligations [Line Items]
Letters of credit, accrued liability	$ 5
Reserve for unfunded lending commitments	1
Deferred commitment fees	4
Commitments for Private Equity and Other Noninterest-bearing Investments	31
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule	2
Minimum [Member]
Guarantor Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	0
Maximum [Member]
Guarantor Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 15

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Commitments, Guarantees, And Contingent Liabilities (Schedule Of Guarantees Issued) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Unused Commitments to Extend Credit	$ 20,999	$ 19,583
Commercial Letters Of Credit	20	31
Total Unfunded Lending Commitments	21,888	20,531
Financial [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	673	721
Performance [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	196	$ 196
Minimum [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Loss Contingency, Estimate of Possible Loss	0
Maximum [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 15

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Revenue Recognition Revenue Recognitiion Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Service Charges, Commissions and Fees	$ 59	$ 55	$ 168	$ 160
Revenue Recognition [Member]
Interest and Fee Income, Loans, Consumer Installment, Credit Card	36	34	103	101
ATM Fees	2	2	7	7
Other Service Charges	4	4	11	11
Other Commissions and Fees	5	4	15	11
Other Service Charges, Commissions and Fees	$ 47	$ 44	$ 136	$ 130

XML

Revenue Recognition Other Service charges, commissions and fees (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Service charges, commissions and fees [Line Items]
Other Service Charges, Commissions and Fees	$ 59	$ 55	$ 168	$ 160
Revenue Recognition [Member]
Other Service charges, commissions and fees [Line Items]
Other Service Charges	4	4	11	11
Other Service Charges, Commissions and Fees	$ 47	$ 44	$ 136	$ 130

XML

Revenue Recognition Revenue by Operation Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	$ 42	$ 42	$ 125	$ 127
Noninterest income, Customer-related Fees	125	122	372	357
Noninterest Income	136	139	412	404
Gains (Losses) on Sales of Other Real Estate				1
Other Service Charges, Commissions and Fees	59	55	168	160
Wealth Management and Trust Income	12	11	38	30
Interest Income (Expense), Net	565	522	1,654	1,539
Zions Bank [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	14	16	43	47
Noninterest income, Customer-related Fees	38	39	110	113
Other non-interest income (non-customer related)	0	0	1	(1)
Noninterest Income	38	39	111	112
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	19	18	54	53
Wealth Management and Trust Income	4	4	11	11
Brokerage Commissions Revenue	1	1	4	3
Total non-interest income from contracts with customers (ASC 606)	38	39	112	114
Other non-interest income (Non-ASC 606 customer related)	0	0	(2)	(1)
Interest Income (Expense), Net	177	165	516	475
Revenues	215	204	627	587
National Bank Of Arizona [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	3	3	9	10
Noninterest income, Customer-related Fees	9	9	26	27
Other non-interest income (non-customer related)	1	1	3	2
Noninterest Income	10	10	29	29
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	3	4	9	9
Wealth Management and Trust Income	0	0	1	1
Brokerage Commissions Revenue	0	0	0	0
Total non-interest income from contracts with customers (ASC 606)	6	7	19	20
Other non-interest income (Non-ASC 606 customer related)	3	2	7	7
Interest Income (Expense), Net	59	53	170	152
Revenues	69	63	199	181
Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	4	4	10	11
Noninterest income, Customer-related Fees	10	10	30	29
Other non-interest income (non-customer related)	0	1	0	1
Noninterest Income	10	11	30	30
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	3	3	9	9
Wealth Management and Trust Income	1	1	3	2
Brokerage Commissions Revenue	0	0	1	0
Total non-interest income from contracts with customers (ASC 606)	8	8	23	22
Other non-interest income (Non-ASC 606 customer related)	2	2	7	7
Interest Income (Expense), Net	38	33	111	96
Revenues	48	44	141	126
Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	2	2	7	6
Noninterest income, Customer-related Fees	6	7	18	18
Other non-interest income (non-customer related)	0	0	0	1
Noninterest Income	6	7	18	19
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	2	3	5	5
Wealth Management and Trust Income	0	0	1	1
Brokerage Commissions Revenue	0	0	0	1
Total non-interest income from contracts with customers (ASC 606)	4	5	13	13
Other non-interest income (Non-ASC 606 customer related)	2	2	5	5
Interest Income (Expense), Net	35	32	101	94
Revenues	41	39	119	113
Commerce Bank Of Washington [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	0	0	1	1
Noninterest income, Customer-related Fees	1	1	4	3
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	1	1	4	3
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	1	1	2	2
Wealth Management and Trust Income	0	0	0	0
Brokerage Commissions Revenue	0	0	0	0
Total non-interest income from contracts with customers (ASC 606)	1	1	3	3
Other non-interest income (Non-ASC 606 customer related)	0	0	1	0
Interest Income (Expense), Net	14	12	38	34
Revenues	15	13	42	37
Other Segment [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	1	1	1	0
Noninterest income, Customer-related Fees	11	9	32	24
Other non-interest income (non-customer related)	10	14	34	44
Noninterest Income	21	23	66	68
Gains (Losses) on Sales of Other Real Estate	0	0	1	1
Other Service Charges, Commissions and Fees	4	0	11	6
Wealth Management and Trust Income	3	3	11	7
Brokerage Commissions Revenue	2	2	4	4
Total non-interest income from contracts with customers (ASC 606)	10	6	27	17
Other non-interest income (Non-ASC 606 customer related)	1	3	5	7
Interest Income (Expense), Net	(29)	(15)	(66)	(27)
Revenues	(8)	8	1	42
Amegy Corporation [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	11	9	33	31
Noninterest income, Customer-related Fees	31	28	95	88
Other non-interest income (non-customer related)	0	0	0	(1)
Noninterest Income	31	28	95	87
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	9	9	28	28
Wealth Management and Trust Income	3	2	8	6
Brokerage Commissions Revenue	(1)	(1)	(4)	(4)
Total non-interest income from contracts with customers (ASC 606)	22	19	65	61
Other non-interest income (Non-ASC 606 customer related)	9	9	30	27
Interest Income (Expense), Net	133	122	385	360
Revenues	164	150	480	447
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	7	7	21	21
Noninterest income, Customer-related Fees	19	19	57	55
Other non-interest income (non-customer related)	0	1	2	1
Noninterest Income	19	20	59	56
Gains (Losses) on Sales of Other Real Estate	0	1	0	1
Other Service Charges, Commissions and Fees	6	6	18	18
Wealth Management and Trust Income	1	1	3	2
Brokerage Commissions Revenue	1	1	3	3
Total non-interest income from contracts with customers (ASC 606)	15	15	45	44
Other non-interest income (Non-ASC 606 customer related)	4	4	12	11
Interest Income (Expense), Net	138	120	399	355
Revenues	157	141	458	412
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	42	42	125	127
Noninterest income, Customer-related Fees	125	122	372	357
Other non-interest income (non-customer related)	11	17	40	47
Noninterest Income	136	139	412	404
Gains (Losses) on Sales of Other Real Estate	0	1	1	2
Other Service Charges, Commissions and Fees	47	44	136	130
Wealth Management and Trust Income	12	11	38	30
Brokerage Commissions Revenue	3	3	8	7
Total non-interest income from contracts with customers (ASC 606)	104	100	307	294
Other non-interest income (Non-ASC 606 customer related)	21	22	65	63
Interest Income (Expense), Net	565	522	1,654	1,539
Revenues	$ 701	$ 662	$ 2,067	$ 1,945

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Retirement Plans (Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans) (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1	$ 2	$ 4	$ 5
Expected return on plan assets	(3)	(3)	(9)	(9)
Amortization of net actuarial (gain) loss	0	1	1	4
Net periodic benefit cost (credit)	(1)	1	(2)	2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 1	$ 1	$ 2	$ 2

XML

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent	23.60%	34.20%	22.90%	30.60%
Corporate Federal Income Tax Rate	21.00%	35.00%
Current State and Local Tax Expense (Benefit)		$ 14
Deferred Tax Assets, State Taxes					$ 4
Deferred Tax Assets, Net	$ 170		$ 170		$ 93

XML

Net Earnings per Common Share Basic and diluted net earnings per common share based on the weighted average outstanding shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 223	$ 160	$ 658	$ 469
Dividends	66	32	170	89
Undistributed Earnings, Basic	157	128	488	380
Undistributed Earnings Applicable to Nonvested Shares	1	1	4	4
Undistributed Earnings (Loss) Available to Common Shareholders, Diluted	156	127	484	376
Distributed Earnings	$ 58	$ 24	$ 144	$ 56
Weighted Average Number of Shares Outstanding, Basic	192,973	200,332	195,079	201,493
Dilutive Effect of Common Stock Warrants	11,880	7,729	12,555	6,783
Dilutive Effect of Stock Options	912	1,045	1,023	1,090
Earnings Per Share, Basic	$ 1.11	$ 0.75	$ 3.22	$ 2.14
Net Income (Loss) Available to Common Stockholders, Diluted	$ 214	$ 151	$ 628	$ 432
Weighted Average Number of Shares Outstanding, Diluted	205,765	209,106	208,657	209,366
Earnings Per Share, Diluted	$ 1.04	$ 0.72	$ 3.01	$ 2.06

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Net Earnings per Common Share Weighted average shares of stock awards that were anti-dilutive and not included in the calculation of diluted earnings per share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,490	1,779	1,651	1,997

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Operating Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) Branches	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Branches	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of community regional banks operating in distinct geographical areas	7		7
Interest Income (Expense), Net	$ 565	$ 522	$ 1,654	$ 1,539
Provision for Loan and Lease Losses	(11)	5	(46)	35
Interest Income (Expense), after Provision for Loan Loss	576	517	1,700	1,504
Noninterest Income, Other Operating Income	1	3	7	3
Noninterest Expense	420	413	1,259	1,232
Income (Loss) from Continuing Operations before Income Taxes, Domestic	292	243	853	676
Investment Securities Gross Unrealized Losses Less Than 12 Months			156		$ 47
Investment Securities Estimated Fair Value Less Than 12 Months	7,291		7,291		5,642
Investment Securities Gross Unrealized Losses 12 Months or More			319		147
Investment Securities Estimated Fair Value 12 Months or More	6,955		6,955		6,714
Investment Securities Gross Unrealized Losses Total			475		194
Investment Securities Estimated Fair Value Total	14,246		14,246		12,356
Zions Bank [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	177	165	516	475
Provision for Loan and Lease Losses	2	(15)	3	18
Interest Income (Expense), after Provision for Loan Loss	175	180	513	457
Noninterest Income, Other Operating Income	38	39	111	112
Noninterest Expense	118	107	350	327
Income (Loss) from Continuing Operations before Income Taxes, Domestic	95	112	274	242
Average Loans And Leases	12,607	12,543	12,565	12,505
Average Deposits	15,845	15,773	15,847	16,001
Amegy Corporation [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	133	122	385	360
Provision for Loan and Lease Losses	(16)	33	(72)	41
Interest Income (Expense), after Provision for Loan Loss	149	89	457	319
Noninterest Income, Other Operating Income	31	28	95	87
Noninterest Expense	84	86	254	259
Income (Loss) from Continuing Operations before Income Taxes, Domestic	96	31	298	147
Average Loans And Leases	11,328	11,170	11,362	10,890
Average Deposits	11,185	10,862	11,022	11,131
National Bank Of Arizona [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	59	53	170	152
Provision for Loan and Lease Losses	(1)	(8)	8	(7)
Interest Income (Expense), after Provision for Loan Loss	60	61	162	159
Noninterest Income, Other Operating Income	10	10	29	29
Noninterest Expense	39	38	115	111
Income (Loss) from Continuing Operations before Income Taxes, Domestic	31	33	76	77
Average Loans And Leases	4,591	4,267	4,591	4,258
Average Deposits	5,008	4,816	4,912	4,747
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	565	522	1,654	1,539
Provision for Loan and Lease Losses	(11)	5	(46)	35
Interest Income (Expense), after Provision for Loan Loss	576	517	1,700	1,504
Noninterest Income, Other Operating Income	136	139	412	404
Noninterest Expense	420	413	1,259	1,232
Income (Loss) from Continuing Operations before Income Taxes, Domestic	292	243	853	676
Average Loans And Leases	45,368	43,832	45,159	43,218
Average Deposits	53,575	51,921	52,827	52,155
Zions Bank [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	14	12	38	34
Provision for Loan and Lease Losses	0	3	2	2
Interest Income (Expense), after Provision for Loan Loss	14	9	36	32
Noninterest Income, Other Operating Income	1	1	4	3
Noninterest Expense	6	5	16	16
Income (Loss) from Continuing Operations before Income Taxes, Domestic	9	5	24	19
Average Loans And Leases	1,136	939	1,113	909
Average Deposits	1,086	1,098	1,069	1,098
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	138	120	399	355
Provision for Loan and Lease Losses	3	(4)	7	(10)
Interest Income (Expense), after Provision for Loan Loss	135	124	392	365
Noninterest Income, Other Operating Income	19	20	59	56
Noninterest Expense	77	74	231	225
Income (Loss) from Continuing Operations before Income Taxes, Domestic	77	70	220	196
Average Loans And Leases	9,985	9,575	9,941	9,453
Average Deposits	11,335	11,021	11,213	10,953
Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	38	33	111	96
Provision for Loan and Lease Losses	0	(3)	0	(8)
Interest Income (Expense), after Provision for Loan Loss	38	36	111	104
Noninterest Income, Other Operating Income	10	11	30	30
Noninterest Expense	35	35	108	105
Income (Loss) from Continuing Operations before Income Taxes, Domestic	13	12	33	29
Average Loans And Leases	2,408	2,347	2,369	2,352
Average Deposits	4,302	4,276	4,280	4,240
Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	35	32	101	94
Provision for Loan and Lease Losses	1	0	5	0
Interest Income (Expense), after Provision for Loan Loss	34	32	96	94
Noninterest Income, Other Operating Income	6	7	18	19
Noninterest Expense	26	25	79	75
Income (Loss) from Continuing Operations before Income Taxes, Domestic	14	14	35	38
Average Loans And Leases	2,969	2,683	2,882	2,607
Average Deposits	2,789	2,757	2,762	2,758
Other Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	(29)	(15)	(66)	(27)
Provision for Loan and Lease Losses	0	(1)	1	(1)
Interest Income (Expense), after Provision for Loan Loss	(29)	(14)	(67)	(26)
Noninterest Income, Other Operating Income	21	23	66	68
Noninterest Expense	35	43	106	114
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(43)	(34)	(107)	(72)
Average Loans And Leases	344	308	336	244
Average Deposits	$ 2,025	1,318	$ 1,722	1,227
ARIZONA | National Bank Of Arizona [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	58		58
NEVADA | Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	50		50
Utah [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	97		97
Idaho [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	23		23
WYOMING | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
Colorado [Member] | Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	36		36
New Mexico [Member] | Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
WASHINGTON | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
OREGON | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
TEXAS | Amegy Corporation [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	73		73
CALIFORNIA | California Bank And Trust [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	90		90
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 565	$ 522	$ 1,654	$ 1,539
Available-for-sale Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	152		152		44
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	7,064		7,064		5,379
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	302		302		137
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	6,612		6,612		6,422
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	454		454		181
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	13,676		13,676		11,801
US Treasury Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	25		25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	25		25
Agency Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	20		20		6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	970		970		808
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	12		12		7
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	354		354		808
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	32		32		13
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,324		1,324		1,616
Agency Guaranteed Mortgage Backed Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	92		92		29
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,821		3,821		3,609
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	249		249		112
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	5,354		5,354		4,721
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	341		341		141
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,175		9,175		8,330
Small Business Administration Loan Backed Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	25		25		3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,414		1,414		408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	25		25		12
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	559		559		649
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	50		50		15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,973		1,973		1,057
US States and Political Subdivisions Debt Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	570		570		555
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	17		17		10
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4		4		3
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	227		227		263
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	343		343		292
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	21		21		13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	15		15		6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	834		834		554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	15		15		5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	331		331		230
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	30		30		11
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,165		1,165		784
Available-for-sale, Unrealized losses, Other [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0		0		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1		1		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	14		14		14
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1		1		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 14		$ 14		$ 14