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 June 30, 2015

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 001-34653

________________________________________________________________________________________________________

First Interstate BancSystem, Inc.

(Exact name of registrant as specified in its charter)

________________________________________________________________________________________________________

Montana	81-0331430
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)
401 North 31st Street, Billings, MT	59116-0918
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: 406/255-5390

______________________________________________________________

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 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, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

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

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 Registrant’s classes of common stock:

June 30, 2015 – Class A common stock	21,720,287
June 30, 2015 – Class B common stock	23,786,296

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES Quarterly Report on Form 10-Q Index
		Page
Part I.	Financial Information
Item 1.	Financial Statements (unaudited)
	Consolidated Balance Sheets - June 30, 2015 and December 31, 2014	3
	Consolidated Statements of Income - Three and Six Months Ended June 30, 2015 and 2014	4
	Consolidated Statements of Comprehensive Income - Three and Six Months Ended June 30, 2015 and 2014	5
	Consolidated Statements of Changes in Stockholders’ Equity - Six Months Ended June 30, 2015 and 2014	6
	Consolidated Statements of Cash Flows - Six Months Ended June 30, 2015 and 2014	7
	Notes to Unaudited Consolidated Financial Statements	9
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	35
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	51
Item 4.	Controls and Procedures	51
Part II.	Other Information
Item 1.	Legal Proceedings	51
Item 1A .	Risk Factors	51
Item  2.	Unregistered Sales of Equity Securities and Use of Proceeds	51
Item 3.	Defaults Upon Senior Securities	52
Item 4.	Mine Safety Disclosures	52
Item 5.	Other Information	52
Item 6.	Exhibits	52
Signatures		54

2

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS (In thousands, except share data) (Unaudited)
	June 30, 2015			December 31, 2014
Assets
Cash and due from banks	$	163,057		$	147,894
Federal funds sold	2,763			543
Interest bearing deposits in banks	340,614			650,233
Total cash and cash equivalents	506,434			798,670
Investment securities:
Available-for-sale	1,592,743			1,711,924
Held-to-maturity (estimated fair values of $553,323 and $584,533 at June 30, 2015 and December 31, 2014, respectively)	546,690			575,186
Total investment securities	2,139,433			2,287,110
Loans held for investment	5,028,624			4,856,615
Mortgage loans held for sale	75,322			40,828
Total loans	5,103,946			4,897,443
Less allowance for loan losses	76,552			74,200
Net loans	5,027,394			4,823,243
Goodwill	204,375			205,574
Premises and equipment, net of accumulated depreciation	189,488			195,212
Company-owned life insurance	177,625			153,821
Other real estate owned (“OREO”)	11,773			13,554
Accrued interest receivable	29,008			27,063
Core deposit intangibles, net of accumulated amortization	11,573			13,282
Mortgage servicing rights, net of accumulated amortization and impairment reserve	14,654			14,038
Deferred tax asset, net	—			4,874
Other assets	74,461			73,495
Total assets	$	8,386,218		$	8,609,936
Liabilities and Stockholders’ Equity
Deposits:
Non-interest bearing	$	1,757,641		$	1,791,364
Interest bearing	5,046,760			5,214,848
Total deposits	6,804,401			7,006,212
Securities sold under repurchase agreements	469,145			502,250
Accounts payable and accrued expenses	53,879			66,164
Accrued interest payable	5,366			5,833
Deferred tax liability	3,024			—
Long-term debt	43,068			38,067
Other borrowed funds	3			9
Subordinated debentures held by subsidiary trusts	82,477			82,477
Total liabilities	7,461,363			7,701,012
Stockholders’ equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued and outstanding as of June 30, 2015 or December 31, 2014	—			—
Common stock	313,125			323,596
Retained earnings	612,875			587,862
Accumulated other comprehensive loss, net	(1,145		)	(2,534		)
Total stockholders’ equity	924,855			908,924
Total liabilities and stockholders’ equity	$	8,386,218		$	8,609,936

See accompanying notes to unaudited consolidated financial statements.

3

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME (In thousands, except per share data) (Unaudited)
	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Interest income:
Interest and fees on loans	$	60,402		$	55,565		$	119,773		$	109,283
Interest and dividends on investment securities:
Taxable	8,000			7,309			15,971			14,949
Exempt from federal taxes	1,040			1,083			2,099			2,180
Interest on deposits in banks	271			225			660			456
Interest on federal funds sold	5			3			7			4
Total interest income	69,718			64,185			138,510			126,872
Interest expense:
Interest on deposits	3,239			3,327			6,548			6,751
Interest on securities sold under repurchase agreements	53			63			107			129
Interest on long-term debt	538			476			1,052			949
Interest on subordinated debentures held by subsidiary trusts	600			592			1,190			1,180
Total interest expense	4,430			4,458			8,897			9,009
Net interest income	65,288			59,727			129,613			117,863
Provision for loan losses	1,340			(2,001		)	2,435			(7,001		)
Net interest income after provision for loan losses	63,948			61,728			127,178			124,864
Non-interest income:
Other service charges, commissions and fees	11,173			9,699			21,040			18,855
Income from the origination and sale of loans	8,802			6,380			14,708			11,040
Wealth management revenues	4,897			4,609			9,834			9,064
Service charges on deposit accounts	4,053			3,929			7,997			7,804
Investment securities gains, net	46			17			52			88
Other income	2,799			1,937			5,921			3,826
Total non-interest income	31,770			26,571			59,552			50,677
Non-interest expense:
Salaries and wages	26,093			24,440			51,442			46,882
Employee benefits	8,070			7,164			15,850			15,477
Occupancy, net	4,529			4,253			9,021			8,492
Furniture and equipment	3,703			3,157			7,496			6,358
Outsourced technology services	2,593			2,309			5,056			4,609
OREO expense, net of income	(823		)	(134		)	(884		)	(153		)
Professional fees	1,514			1,278			2,815			2,648
FDIC insurance premiums	1,304			1,093			2,446			2,209
Mortgage servicing rights amortization	627			583			1,246			1,183
Mortgage servicing rights impairment recovery	(56		)	(11		)	(71		)	(56		)
Core deposit intangibles amortization	854			354			1,709			708
Other expenses	13,577			10,837			25,381			21,304
Acquisition expenses	(7		)	597			63			597
Total non-interest expense	61,978			55,920			121,570			110,258
Income before income tax expense	33,740			32,379			65,160			65,283
Income tax expense	11,518			11,302			21,958			22,813
Net income	$	22,222		$	21,077		$	43,202		$	42,470
Basic earnings per common share	$	0.49		$	0.48		$	0.95		$	0.96
Diluted earnings per common share	$	0.49		$	0.47		$	0.94		$	0.95

See accompanying notes to unaudited consolidated financial statements.

4

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (In thousands) (Unaudited)
	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Net income	$	22,222		$	21,077		$	43,202		$	42,470
Other comprehensive income, before tax:
Investment securities available-for sale:
Change in net unrealized gains (losses) during period	(9,196		)	2,816			1,412			17,167
Reclassification adjustment for net gains included in income	(46		)	(17		)	(52		)	(88		)
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity	451			—			902			—
Defined benefit post-retirement benefits plans:
Change in net actuarial loss	13			35			28			70
Other comprehensive income (loss), before tax	(8,778		)	2,834			2,290			17,149
Deferred tax benefit (expense) related to other comprehensive income	3,454			(1,115		)	(901		)	(6,748		)
Other comprehensive income (loss), net of tax	(5,324		)	1,719			1,389			10,401
Comprehensive income, net of tax	$	16,898		$	22,796		$	44,591		$	52,871

See accompanying notes to unaudited consolidated financial statements.

5

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (In thousands, except share and per share data) (Unaudited)
	Common stock			Retained earnings			Accumulated other comprehensive income (loss)			Total stockholders’ equity
Balance at December 31, 2014	$	323,596		$	587,862		$	(2,534	)	$	908,924
Net income	—			43,202			—			43,202
Other comprehensive income, net of tax expense	—			—			1,389			1,389
Common stock transactions:
588,409 common shares purchased and retired	(15,264		)	—			—			(15,264		)
21,414 common shares issued	—			—			—			—
156,956 non-vested common shares issued	—			—			—			—
1,678 non-vested common shares forfeited	—			—			—			—
129,885 stock options exercised, net of 37,357 shares tendered in payment of option price and income tax withholding amounts	1,670			—			—			1,670
Tax benefit of stock-based compensation	804			—			—			804
Stock-based compensation expense	2,319			—			—			2,319
Common cash dividend declared ($0.40 per share)	—			(18,189		)	—			(18,189		)
Balance at June 30, 2015	$	313,125		$	612,875		$	(1,145	)	$	924,855
Balance at December 31, 2013	$	285,535		$	532,087		$	(16,041	)	$	801,581
Net income	—			42,470			—			42,470
Other comprehensive income, net of tax expense	—			—			10,401			10,401
Common stock transactions:
349,930 common shares purchased and retired	(8,764		)	—			—			(8,764		)
24,581 common shares issued	—			—			—			—
147,876 non-vested common shares issued	—			—			—			—
8,647 non-vested common shares forfeited	—			—			—			—
286,069 stock options exercised, net of 160,377 shares tendered in payment of option price and income tax withholding amounts	3,547			—			—			3,547
Tax benefit of stock-based compensation	1,225			—			—			1,225
Stock-based compensation expense	2,154			—			—			2,154
Common cash dividend declared ($0.32 per share)	—			(14,088		)	—			(14,088		)
Balance at June 30, 2014	$	283,697		$	560,469		$	(5,640	)	$	838,526

See accompanying notes to unaudited consolidated financial statements.

6

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (In thousands) (Unaudited)
	Six Months Ended June 30,
	2015			2014
Cash flows from operating activities:
Net income	$	43,202		$	42,470
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	2,435			(7,001		)
Net gain on disposal of premises and equipment	(856		)	(79		)
Depreciation and amortization	9,090			7,786
Net premium amortization on investment securities	7,021			7,088
Net gain on investment securities transactions	(52		)	(88		)
Net gain on sale of mortgage loans held for sale	(10,759		)	(7,601		)
Net gain on sale of OREO	(1,736		)	(766		)
Write-downs of OREO and other assets pending disposal	106			10
Net reversal of impairment of mortgage servicing rights	(71		)	(56		)
Deferred income tax expense	9,108			3,760
Net increase in cash surrender value of company-owned life insurance	(1,304		)	(1,724		)
Stock-based compensation expense	2,319			2,154
Tax benefits from stock-based compensation expense	804			1,225
Excess tax benefits from stock-based compensation expense	(530		)	(1,211		)
Originations of mortgage loans held for sale	(561,779		)	(412,050		)
Proceeds from sales of mortgage loans held for sale	546,871			402,825
Changes in operating assets and liabilities:
Increase in interest receivable	(1,945		)	(47		)
Increase in other assets	(1,034		)	(1,929		)
Increase (decrease) in accrued interest payable	(467		)	353
Decrease in accounts payable and accrued expenses	(12,268		)	(4,788		)
Net cash provided by operating activities	28,155			30,331
Cash flows from investing activities:
Purchases of investment securities:
Held-to-maturity	(27,640		)	(4,141		)
Available-for-sale	(223,483		)	(175,823		)
Proceeds from maturities, pay-downs and sales of investment securities:
Held-to-maturity	55,654			9,347
Available-for-sale	337,538			243,355
Purchases of company-owned life insurance	(22,500		)	(15,000		)
Proceeds from sales of mortgage servicing rights	—			266
Extensions of credit to customers, net of repayments	(190,392		)	(155,523		)
Recoveries of loans charged-off	3,285			5,345
Proceeds from sales of OREO	7,807			4,234
Capital expenditures, net of sales	514			(6,309		)
Net cash used in investing activities	$	(59,217	)	$	(94,249	)

7

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (In thousands) (Unaudited)
	Six Months Ended June 30,
	2015			2014
Cash flows from financing activities:
Net increase (decrease) in deposits	$	(201,811	)	$	45,292
Net increase (decrease) in securities sold under repurchase agreements	(33,105		)	5,548
Net increase (decrease) in other borrowed funds	(6		)	17
Repayments of long-term debt	(30		)	(24		)
Advances on long-term debt	5,031			—
Proceeds from issuance of common stock	1,670			3,547
Excess tax benefits from stock-based compensation expense	530			1,211
Purchase and retirement of common stock	(15,264		)	(8,764		)
Dividends paid to common stockholders	(18,189		)	(14,088		)
Net cash provided by (used in) financing activities	(261,174		)	32,739
Net decrease in cash and cash equivalents	(292,236		)	(31,179		)
Cash and cash equivalents at beginning of period	798,670			534,827
Cash and cash equivalents at end of period	$	506,434		$	503,648
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	$	18,450		$	16,190
Cash paid during the period for interest expense	9,364			8,656

See accompanying notes to unaudited consolidated financial statements.

8

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

(1) Basis of Presentation

In the opinion of management, the accompanying unaudited consolidated financial statements of First Interstate BancSystem, Inc. and subsidiaries (the “Company”) contain all adjustments (all of which are of a normal recurring nature) necessary to present fairly the financial position of the Company at June 30, 2015 and December 31, 2014, and the results of operations for each of the three and six month periods ended and cash flows for each of the six month periods ended June 30, 2015 and 2014 in conformity with U.S. generally accepted accounting principles. The balance sheet information at December 31, 2014 is derived from audited consolidated financial statements. Certain reclassifications, none of which were material, have been made to conform prior year financial statements to the June 30, 2015 presentation. These reclassifications did not change previously reported net income or stockholders’ equity.

These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014. Operating results for the three and six months ended June 30, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015.

(2) Acquisitions

Absarokee Bancorporation, Inc. On March 26, 2015, the Company entered into an agreement and plan of merger to acquire all of the outstanding stock of Absarokee Bancorporation, Inc. ("Absarokee"), a Montana-based bank holding company that operates one subsidiary bank, United Bank, with branches located in three Montana communities adjacent to the Company's existing market areas.

The acquisition was completed on July 24, 2015 for cash consideration of $7,234. Immediately subsequent to the acquisition, United Bank was merged with and into the Company's existing bank subsidiary, First Interstate Bank ("FIB"). As of the date of the acquisition, Absarokee has total assets of approximately $73,272, loans of approximately $37,520 and deposits of approximately $63,580.

Mountain West Financial Corp. On July 31, 2014, the Company acquired all of the outstanding stock of Mountain West Financial Corp ("MWFC"), a Montana-based bank holding company operating one subsidiary bank, Mountain West Bank, NA ("MWB"). MWB was merged with and into FIB in October 2014. During March 2015, the Company completed its review of MWFC tax items and finalized the fair value of acquired deferred tax assets. Finalization of provisional estimates resulted in a $1,199 decrease in goodwill.

9

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

(3) Investment Securities

The amortized cost and approximate fair values of investment securities are summarized as follows:

June 30, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-Sale:
Obligations of U.S. government agencies	$	622,237	$	1,087	$	(2,304	)	$	621,020
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	965,430		10,468		(4,463		)	971,435
Private mortgage-backed securities	286		4		(2		)	288
Total	$	1,587,953	$	11,559	$	(6,769	)	$	1,592,743

June 30, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Held-to-Maturity:
State, county and municipal securities	$	181,642	$	4,644	$	(524	)	$	185,762
Corporate securities	50,310		59		(204		)	50,165
U.S agency residential mortgage-backed securities &     collateralized mortgage obligations	314,326		5,945		(3,288		)	316,983
Other investments	412		1		—			413
Total	$	546,690	$	10,649	$	(4,016	)	$	553,323

December 31, 2014	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-Sale:
Obligations of U.S. government agencies	$	725,408	$	895	$	(5,370	)	$	720,933
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	982,764		11,526		(3,624		)	990,666
Private mortgage-backed securities	322		5		(2		)	325
Total	$	1,708,494	$	12,426	$	(8,996	)	$	1,711,924

December 31, 2014	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Held-to-Maturity:
State, county and municipal securities	$	188,941	$	5,949	$	(386	)	$	194,504
Corporate securities	32,565		54		(75		)	32,544
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	353,176		5,563		(1,758		)	356,981
Other Investments	504		—		—			504
Total	$	575,186	$	11,566	$	(2,219	)	$	584,533

Gross realized gains and losses from the disposition of investment securities are summarized in the following table:

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Gross realized gains	$	46	$	18	$	52	$	243
Gross realized losses	—		1		—		155

10

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in a continuous unrealized loss position, as of June 30, 2015 and December 31, 2014.

	Less than 12 Months					12 Months or More					Total
June 30, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-Sale:
Obligations of U.S. government agencies	$	106,516	$	(460	)	$	239,339	$	(1,844	)	$	345,855	$	(2,304	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	254,399		(1,480		)	133,709		(2,983		)	388,108		(4,463		)
Private mortgage-backed securities	—		—			83		(2		)	83		(2		)
Total	$	360,915	$	(1,940	)	$	373,131	$	(4,829	)	$	734,046	$	(6,769	)

	Less than 12 Months					12 Months or More					Total
June 30, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Held-to-Maturity:
State, county and municipal securities	$	19,427	$	(165	)	$	13,513	$	(359	)	$	32,940	$	(524	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	85,286		(3,288		)	—		—			85,286		(3,288		)
Corporate securities	31,291		(204		)	—		—			31,291		(204		)
Total	$	136,004	$	(3,657	)	$	13,513	$	(359	)	$	149,517	$	(4,016	)

	Less than 12 Months					12 Months or More					Total
December 31, 2014	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-Sale:
Obligations of U.S. government agencies	$	135,888	$	(702	)	$	309,283	$	(4,668	)	$	445,171	$	(5,370	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	219,214		(887		)	151,380		(2,737		)	370,594		(3,624		)
Private mortgage-backed securities	—		—			90		(2		)	90		(2		)
Total	$	355,102	$	(1,589	)	$	460,753	$	(7,407	)	$	815,855	$	(8,996	)

	Less than 12 Months					12 Months or More					Total
December 31, 2014	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Held-to-Maturity:
State, county and municipal securities	$	7,979	$	(13	)	$	20,097	$	(373	)	$	28,076	$	(386	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	61,201		(1,758		)	—		—			61,201		(1,758		)
Corporate securities	14,755		(75		)	—		—			14,755		(75		)
Total	$	83,935	$	(1,846	)	$	20,097	$	(373	)	$	104,032	$	(2,219	)

11

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

The investment portfolio is evaluated quarterly for other-than-temporary declines in the market value of each individual investment security. The Company had 190 and 154 individual investment securities that were in an unrealized loss position as of June 30, 2015 and December 31, 2014, respectively. Unrealized losses as of June 30, 2015 and December 31, 2014 related primarily to fluctuations in the current interest rates. The Company does not have the intent to sell any of the available-for-sale securities in the above table and it is not likely that the Company will have to sell any such securities before a recovery in cost. No impairment losses were recorded during the three and six months ended June 30, 2015 and 2014.

Maturities of investment securities at June 30, 2015 are shown below. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates.

	Available-for-Sale				Held-to-Maturity
June 30, 2015	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Within one year	$	321,079	$	322,976	$	97,639	$	98,594
After one year but within five years	1,189,454		1,192,101		273,778		276,390
After five years but within ten years	58,106		58,232		125,446		127,706
After ten years	19,314		19,434		49,827		50,633
Total	$	1,587,953	$	1,592,743	$	546,690	$	553,323

As of June 30, 2015, the Company had investment securities callable within one year with amortized costs and estimated fair values of $104,832 and $104,923, respectively, including callable structured notes with amortized costs and estimated fair values of $4,996 and $5,004, respectively. These investment securities are primarily classified as available-for-sale and included in the after one year but within five years category in the table above.

12

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

(4) Loans

The following table presents loans by class as of the dates indicated:

	June 30, 2015		December 31, 2014
Real estate loans:
Commercial	$	1,704,073	$	1,639,422
Construction:
Land acquisition & development	211,889		220,443
Residential	101,023		96,580
Commercial	90,316		101,246
Total construction loans	403,228		418,269
Residential	999,038		999,903
Agricultural	158,506		167,659
Total real estate loans	3,264,845		3,225,253
Consumer:
Indirect consumer	589,479		552,863
Other consumer	144,919		144,141
Credit card	64,728		65,467
Total consumer loans	799,126		762,471
Commercial	819,119		740,073
Agricultural	142,629		124,859
Other, including overdrafts	2,905		3,959
Loans held for investment	5,028,624		4,856,615
Mortgage loans held for sale	75,322		40,828
Total loans	$	5,103,946	$	4,897,443

Loans from business combinations included in the table above include certain loans that had evidence of deterioration in credit quality since origination and for which it was probable, at acquisition, that all contractually required payments would not be collected.

The following table displays the outstanding unpaid principal balance, accrued interest receivable and accrual status of loans acquired with credit impairment as of June 30, 2015 and 2014:    

As of June 30,	2015		2014
Outstanding balance	$	35,555	$	—
Carrying value
Loans on accrual status	22,293		—
Loans on non-accrual status	—		—
Total carrying value	$	22,293	$	—

13

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

The following table summarizes changes in the accretable yield for loans acquired credit impaired for the three and six ended June 30, 2015 and 2014:

	Three Months Ended June 30,					Six Months Ended June 30,
	2015			2014		2015			2014
Beginning balance	$	6,980		$	—	$	5,781		$	—
Accretion income	(807		)	—		(1,355		)	—
Reductions due to exit events	—			—		(396		)	—
Reclassifications from (to) nonaccretable differences	1,309			—		3,452			—
Ending balance	$	7,482		$	—	$	7,482		$	—

Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. The following tables present the contractual aging of the Company’s recorded investment in past due loans by class as of the dates indicated:

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of June 30, 2015	Past Due		Past Due		Past Due		Past Due		Loans		Loans		Loans
Real estate
Commercial	$	5,123	$	2,803	$	111	$	8,037	$	1,669,445	$	26,591	$	1,704,073
Construction:
Land acquisition & development	1,075		276		156		1,507		202,620		7,762		211,889
Residential	417		—		—		417		100,274		332		101,023
Commercial	—		—		—		—		86,874		3,442		90,316
Total construction loans	1,492		276		156		1,924		389,768		11,536		403,228
Residential	3,563		1,524		929		6,016		990,453		2,569		999,038
Agricultural	875		261		—		1,136		150,586		6,784		158,506
Total real estate loans	11,053		4,864		1,196		17,113		3,200,252		47,480		3,264,845
Consumer:
Indirect consumer	3,382		507		26		3,915		585,200		364		589,479
Other consumer	785		121		29		935		143,241		743		144,919
Credit card	415		224		391		1,030		63,684		14		64,728
Total consumer loans	4,582		852		446		5,880		792,125		1,121		799,126
Commercial	8,285		812		190		9,287		788,210		21,622		819,119
Agricultural	700		30		10		740		141,264		625		142,629
Other, including overdrafts	—		—		311		311		2,594		—		2,905
Loans held for investment	24,620		6,558		2,153		33,331		4,924,445		70,848		5,028,624
Mortgage loans originated for sale	—		—		—		—		75,322		—		75,322
Total loans	$	24,620	$	6,558	$	2,153	$	33,331	$	4,999,767	$	70,848	$	5,103,946

14

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of December 31, 2014	Past Due		Past Due		Past Due		Past Due		Loans		Loans		Loans
Real estate
Commercial	$	4,692	$	1,609	$	331	$	6,632	$	1,605,421	$	27,369	$	1,639,422
Construction:
Land acquisition & development	839		383		—		1,222		210,969		8,252		220,443
Residential	—		475		—		475		95,833		272		96,580
Commercial	100		—		—		100		98,582		2,564		101,246
Total construction loans	939		858		—		1,797		405,384		11,088		418,269
Residential	6,969		645		1,762		9,376		987,735		2,792		999,903
Agricultural	1,624		236		—		1,860		158,957		6,842		167,659
Total real estate loans	14,224		3,348		2,093		19,665		3,157,497		48,091		3,225,253
Consumer:
Indirect consumer	3,235		482		6		3,723		548,757		383		552,863
Other consumer	988		140		32		1,160		142,432		549		144,141
Credit card	369		284		315		968		64,484		15		65,467
Total consumer loans	4,592		906		353		5,851		755,673		947		762,471
Commercial	3,659		994		147		4,800		722,575		12,698		740,073
Agricultural	1,125		—		—		1,125		123,288		446		124,859
Other, including overdrafts	—		—		—		—		3,959		—		3,959
Loans held for investment	23,600		5,248		2,593		31,441		4,762,992		62,182		4,856,615
Mortgage loans originated for sale	—		—		—		—		40,828		—		40,828
Total loans	$	23,600	$	5,248	$	2,593	$	31,441	$	4,803,820	$	62,182	$	4,897,443

Acquired loans that met the criteria for nonaccrual of interest prior to the acquisition were considered performing upon acquisition. If interest on non-accrual loans had been accrued, such income would have been approximately $875 and $1,061 for the three months ended June 30, 2015 and 2014, respectively, and approximately $1,613 and $2,182 for the six months ended June 30, 2015 and 2014 respectively.

15

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

The Company considers impaired loans to include all loans, except consumer loans, that are risk rated as doubtful, or have been placed on non-accrual status or renegotiated in troubled debt restructurings. The following tables present information on the Company’s recorded investment in impaired loans as of dates indicated:

As of June 30, 2015	Unpaid Total Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
Real estate:
Commercial	$	60,786	$	31,201	$	17,201	$	48,402	$	1,810
Construction:
Land acquisition & development	22,630		6,452		5,915		12,367		569
Residential	969		332		—		332		—
Commercial	3,796		426		1,590		2,016		1,606
Total construction loans	27,395		7,210		7,505		14,715		2,175
Residential	5,442		2,291		1,429		3,720		127
Agricultural	9,094		6,396		2,202		8,598		712
Total real estate loans	102,717		47,098		28,337		75,435		4,824
Commercial	28,472		11,275		12,298		23,573		3,279
Agricultural	2,110		427		1,058		1,485		618
Total	$	133,299	$	58,800	$	41,693	$	100,493	$	8,721

As of December 31, 2014	Unpaid Total Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
Real estate:
Commercial	$	41,603	$	28,143	$	11,246	$	39,389	$	1,608
Construction:
Land acquisition & development	12,511		7,262		1,615		8,877		574
Residential	459		272		—		272		—
Commercial	2,729		253		2,442		2,695		904
Total construction loans	15,699		7,787		4,057		11,844		1,478
Residential	2,959		2,452		341		2,793		143
Agricultural	8,844		6,444		2,305		8,749		732
Total real estate loans	69,105		44,826		17,949		62,775		3,961
Commercial	16,904		11,882		2,644		14,526		1,190
Agricultural	1,231		342		837		1,179		641
Total	$	87,240	$	57,050	$	21,430	$	78,480	$	5,792

16

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

The following table presents the average recorded investment in and income recognized on impaired loans for the periods indicated:

	Three Months Ended June 30,
	2015				2014
	Average Recorded Investment		Income Recognized		Average Recorded Investment		Income Recognized
Real estate:
Commercial	$	39,513	$	211	$	57,588	$	241
Construction:
Land acquisition & development	8,664		12		13,563		11
Residential	338		—		785		—
Commercial	3,492		—		1,471		2
Total construction loans	12,494		12		15,819		13
Residential	3,014		1		5,852		1
Agricultural	8,572		13		9,747		25
Total real estate loans	63,593		237		89,006		280
Commercial	21,841		112		14,162		14
Agricultural	1,004		8		742		6
Total	$	86,438	$	357	$	103,910	$	300

	Six Months Ended June 30,
	2015				2014
	Average Recorded Investment		Income Recognized		Average Recorded Investment		Income Recognized
Real estate:
Commercial	$	40,652	$	361	$	60,870	$	457
Construction:
Land acquisition & development	8,720		22		14,554		22
Residential	302		—		1,051		—
Commercial	3,133		2		918		4
Total construction loans	12,155		24		16,523		26
Residential	2,719		2		5,969		3
Agricultural	8,666		35		9,830		29
Total real estate loans	64,192		422		93,192		515
Commercial	17,874		120		14,231		28
Agricultural	857		13		538		12
Total	$	82,923	$	555	$	107,961	$	555

The amount of interest income recognized by the Company within the period that the loans were impaired was primarily related to loans modified in a troubled debt restructuring that remained on accrual status. Interest payments received on non-accrual impaired loans are applied to principal. Interest income is subsequently recognized only to the extent cash payments are received in excess of principal due. If interest on impaired loans had been accrued, interest income on impaired loans would have been approximately $1,045 and $1,301 for the three months ended June 30, 2015 and 2014, respectively, and approximately $2,011 and $2,412 for the six months ended June 30, 2015 and 2014 respectively.

Collateralized impaired loans are generally recorded at the fair value of the underlying collateral using discounted cash flows, independent appraisals and management estimates based upon current market conditions. For loans measured under the present value of cash flows method, the change in present value attributable to the passage of time, if applicable, is recognized in the provision for loan losses and thus no interest income is recognized.

17

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

Modifications of performing loans are made in the ordinary course of business and are completed on a case-by-case basis as negotiated with the borrower. Loan modifications typically include interest rate concessions, interest only periods of less than twelve months, short-term payment deferrals and extension of amortization periods to provide payment relief. A loan modification is considered a troubled debt restructuring if the borrower is experiencing financial difficulties and the Company, for economic or legal reasons, grants a concession to the borrower that it would not otherwise consider. Certain troubled debt restructurings are on non-accrual status at the time of restructuring and are typically returned to accrual status after considering the borrower's sustained repayment performance in accordance with the restructuring agreement for a period of at least six months and management is reasonably assured of future performance. If the troubled debt restructuring meets these performance criteria and the interest rate granted at the modification is equal to or greater than the rate that the Company was willing to accept at the time of the restructuring for a new loan with comparable risk, then the loan will return to performing status and the accrual of interest will resume.

The Company had loans renegotiated in troubled debt restructurings of $37,363 as of June 30, 2015, of which $22,236 were included in non-accrual loans and $15,127 were on accrual status. The Company had loans renegotiated in troubled debt restructurings of $44,227 as of December 31, 2014, of which $23,275 were included in non-accrual loans and $20,952 were on accrual status.

No troubled debt restructurings occurred during the three months ended June 30, 2015. The following table presents information on the Company's troubled debt restructurings that occurred during the six months ended June 30, 2015:    

	Number of Notes	Type of Concession								Principal Balance at Restructure Date
Six Months Ended June 30, 2015		Interest only period		Extension of terms or maturity		Interest rate adjustment		Other
Commercial	1	$	—	$	10	$	—	$	—	$	10
Total loans restructured during period	1	$	—	$	10	$	—	$	—	$	10

For troubled debt restructurings that were on non-accrual status or otherwise deemed impaired before the modification, a specific reserve may already be recorded. In periods subsequent to modification, the Company continues to evaluate all troubled debt restructurings for possible impairment and recognizes impairment through the allowance. Additionally these loans continue to work their way through the credit cycle through charge-off, pay-off or foreclosure. Financial effects of modifications of troubled debt restructurings may include principal loan forgiveness or other charge-offs directly related to the restructuring. The Company had no charge-offs directly related to modifying troubled debt restructurings during the three or six months ended June 30, 2015 or 2014.

The following table presents information on the Company's troubled debt restructurings during the previous 12 months for which there was a payment default during the periods indicated. The Company considers a payment default to occur on troubled debt restructurings when the loan is 90 days or more past due or was placed on non-accrual status after the modification.

	Three Months Ended June 30, 2015			Six Months Ended June 30, 2015
	Number of Notes	Balance		Number of Notes	Balance
Commercial Real Estate	—	$	—	1	$	1,822

At June 30, 2015, there were no material commitments to lend additional funds to borrowers whose existing loans have been renegotiated or are classified as non-accrual.

As part of the on-going and continuous monitoring of the credit quality of the Company’s loan portfolio, management tracks internally assigned risk classifications of loans. The Company adheres to a Uniform Classification System developed jointly by the various bank regulatory agencies to internally risk rate loans. The Uniform Classification System defines three broad categories of criticized assets, which the Company uses as credit quality indicators:

18

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

Other Assets Especially Mentioned — includes loans that exhibit weaknesses in financial condition, loan structure or documentation, which if not promptly corrected, may lead to the development of abnormal risk elements.

Substandard — includes loans that are inadequately protected by the current sound worth and paying capacity of the borrower. Although the primary source of repayment for a substandard loan is not currently sufficient; collateral or other sources of repayment are sufficient to satisfy the debt. Continuance of a substandard loan is not warranted unless positive steps are taken to improve the worthiness of the credit.

Doubtful — includes loans that exhibit pronounced weaknesses to a point where collection or liquidation in full, on the basis of currently existing facts, conditions and values, is highly questionable and improbable. Doubtful loans are required to be placed on non-accrual status and are assigned specific loss exposure.

Company management undertakes the same process for assigning risk ratings to acquired loans as it does for originated loans. Acquired loans rated as substandard or lower or that were on non-accrual status or designated as troubled debt restructurings at the time of acquisition are deemed to be acquired credit impaired loans accounted for under ASC Topic 310-30, regardless of whether they are classified as performing or non-performing loans.

The following tables present the Company’s recorded investment in criticized loans by class and credit quality indicator based on the most recent analysis performed as of the dates indicated:

As of June 30, 2015	Other Assets Especially Mentioned		Substandard		Doubtful		Total Criticized Loans
Real estate:
Commercial	$	83,194	$	85,323	$	7,952	$	176,469
Construction:
Land acquisition & development	13,426		14,190		2,031		29,647
Residential	857		2,165		29		3,051
Commercial	—		409		3,161		3,570
Total construction loans	14,283		16,764		5,221		36,268
Residential	8,434		9,387		1,002		18,823
Agricultural	9,826		14,838		595		25,259
Total real estate loans	115,737		126,312		14,770		256,819
Consumer:
Indirect consumer	843		1,454		161		2,458
Other consumer	557		930		349		1,836
Credit card	—		—		—		—
Total consumer loans	1,400		2,384		510		4,294
Commercial	34,776		24,519		15,691		74,986
Agricultural	3,794		6,684		730		11,208
Total	$	155,707	$	159,899	$	31,701	$	347,307

19

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

As of December 31, 2014	Other Assets Especially Mentioned		Substandard		Doubtful		Total Criticized Loans
Real estate:
Commercial	$	84,533	$	83,448	$	15,246	$	183,227
Construction:
Land acquisition & development	11,826		15,016		2,507		29,349
Residential	2,029		2,666		—		4,695
Commercial	39		253		2,442		2,734
Total construction loans	13,894		17,935		4,949		36,778
Residential	10,473		10,848		1,121		22,442
Agricultural	10,122		12,328		612		23,062
Total real estate loans	119,022		124,559		21,928		265,509
Consumer:
Indirect consumer	916		1,590		121		2,627
Other consumer	553		1,085		432		2,070
Credit card	—		348		1,263		1,611
Total consumer loans	1,469		3,023		1,816		6,308
Commercial	25,766		32,433		10,273		68,472
Agricultural	7,827		3,660		837		12,324
Total	$	154,084	$	163,675	$	34,854	$	352,613

The Company maintains a credit review function, which is independent of the credit approval process, to assess assigned internal risk classifications and monitor compliance with internal lending policies and procedures. Written action plans with firm target dates for resolution of identified problems are maintained and reviewed on a quarterly basis for all categories of criticized loans.

20

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

(5) Allowance for Loan Losses

The following tables present a summary of changes in the allowance for loan losses by portfolio segment for the periods indicated.

Three Months Ended June 30, 2015	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Beginning balance	$	53,659		$	5,499		$	15,196		$	982	$	—	$	75,336
Provision charged to operating expense	461			646			224			9		—		1,340
Less loans charged-off	(610		)	(837		)	(61		)	—		—		(1,508		)
Add back recoveries of loans previously    charged-off	425			520			438			1		—		1,384
Ending balance	$	53,935		$	5,828		$	15,797		$	992	$	—	$	76,552
Six Months Ended June 30, 2015	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Beginning balance	$	53,884		$	5,035		$	14,307		$	974	$	—	$	74,200
Provision charged to operating expense	(570		)	1,771			1,217			17		—		2,435
Less loans charged-off	(795		)	(2,138		)	(435		)	—		—		(3,368		)
Add back recoveries of loans previously    charged-off	1,416			1,160			708			1		—		3,285
Ending balance	$	53,935		$	5,828		$	15,797		$	992	$	—	$	76,552
As of June 30, 2015	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Loans individually evaluated for impairment	$	4,824		$	—		$	3,279		$	618	$	—	$	8,721
Loans collectively evaluated for impairment	49,111			5,828			12,518			374		—		67,831
Allowance for loan losses	$	53,935		$	5,828		$	15,797		$	992	$	—	$	76,552
Total loans:
Individually evaluated for impairment	$	75,435		$	—		$	23,573		$	1,485	$	—	$	100,493
Collectively evaluated for impairment	3,264,732			799,126			795,546			141,144		2,905		5,003,453
Total loans	$	3,340,167		$	799,126		$	819,119		$	142,629	$	2,905	$	5,103,946

Three Months Ended June 30, 2014	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Beginning balance	$	59,830		$	5,377		$	15,701		$	463	$	—	$	81,371
Provision charged to operating expense	(2,011		)	346			(494		)	158		—		(2,001		)
Less loans charged-off	(1,158		)	(934		)	(534		)	—		—		(2,626		)
Add back recoveries of loans previously    charged-off	651			558			313			—		—		1,522
Ending balance	$	57,312		$	5,347		$	14,986		$	621	$	—	$	78,266

21

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

Six Months Ended June 30, 2014	Real Estate			Consumer			Commercial			Agriculture			Other		Total
Allowance for loan losses:
Beginning balance	$	63,923		$	6,193		$	14,747		$	476		$	—	$	85,339
Provision charged to operating expense	(5,386		)	(232		)	(1,566		)	183			—		(7,001		)
Less loans charged-off	(2,243		)	(1,780		)	(1,330		)	(64		)	—		(5,417		)
Add back recoveries of loans previously    charged-off	1,018			1,166			3,135			26			—		5,345
Ending balance	$	57,312		$	5,347		$	14,986		$	621		$	—	$	78,266
As of December 31, 2014	Real Estate			Consumer			Commercial			Agriculture			Other		Total
Allowance for loan losses:
Loans individually evaluated for impairment	$	3,961		$	—		$	1,190		$	641		$	—	$	5,792
Loans collectively evaluated for impairment	49,923			5,035			13,117			333			—		68,408
Allowance for loan losses	$	53,884		$	5,035		$	14,307		$	974		$	—	$	74,200
Total loans:
Individually evaluated for impairment	$	62,775		$	—		$	14,526		$	1,179		$	—	$	78,480
Collectively evaluated for impairment	3,203,306			762,471			725,547			123,680			3,959		4,818,963
Total loans	$	3,266,081		$	762,471		$	740,073		$	124,859		$	3,959	$	4,897,443

The Company performs a quarterly assessment of the adequacy of its allowance for loan losses in accordance with generally accepted accounting principles. The methodology used to assess the adequacy is consistently applied to the Company's loan portfolio and consists of three elements: (1) specific valuation allowances based on probable losses on impaired loans; (2) historical valuation allowances based on loan loss experience for similar loans with similar characteristics and trends; and (3) general valuation allowances determined based on changes in the nature of the loan portfolio, overall portfolio quality, industry concentrations, delinquency trends, general economic conditions and other qualitative risk factors both internal and external to the Company.

Specific allowances are established for loans where management has determined that probability of a loss exists by analyzing the borrower’s ability to repay amounts owed, collateral deficiencies and any relevant qualitative or economic factors impacting the loan. Historical valuation allowances are determined by applying percentage loss factors to the credit exposures from outstanding loans. For commercial, agricultural and real estate loans, loss factors are applied based on the internal risk classifications of these loans. For consumer loans, loss factors are applied on a portfolio basis. For commercial, agriculture and real estate loans, loss factor percentages are based on a migration analysis of our historical loss experience, designed to account for credit deterioration. For consumer loans, loss factor percentages are based on a one-year loss history. General valuation allowances are determined by evaluating, on a quarterly basis, changes in the nature and volume of the loan portfolio, overall portfolio quality, industry concentrations, current economic and regulatory conditions and the estimated impact of these factors on historical loss rates.

An allowance for loan losses is established for loans acquired credit impaired and for which the Company projects a decrease in the expected cash flows in periods subsequent to the acquisition of such loans. As of June 30, 2015 and December 31, 2014, the Company's allowance for loan losses included $501 and $287, respectively, related to acquired loans.

22

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

(6) Other Real Estate Owned

Information with respect to the Company's other real estate owned follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Beginning balance	$	15,134		$	16,594		$	13,554		$	15,504
Additions	1,139			984			4,396			4,399
Valuation adjustments	—			(10		)	(106		)	(10		)
Dispositions	(4,500		)	(1,143		)	(6,071		)	(3,468		)
Ending balance	$	11,773		$	16,425		$	11,773		$	16,425

Foreclosed residential real estate properties of $3,708 were included in other real estate owned as of June 30, 2015. Consumer mortgage loans collateralized by residential real estate property of $65 were in the process of foreclosure as of June 30, 2015.

(7) Long-Term Debt

On January 29, 2015, the Company borrowed $4,960 on a 2.28% note payable maturing July 29, 2022, with interest payable monthly and principal due at maturity. The note is collateralized by the Company's equity interest in Universal Sub CDE, LLC, a community development entity owned 99.9% by the Company.

(8) Capital Stock

The Company had 21,720,287 shares of Class A common stock and 23,786,296 shares of Class B common stock outstanding as of June 30, 2015. The Company had 21,928,932 shares of Class A common stock and 23,859,483 shares of Class B common stock outstanding as of December 31, 2014.

During the six months ended June 30, 2015, the Company repurchased and retired 565,875 shares of its Class A common stock in open market transactions at an aggregate purchase price of $14,674. During the six months ended June 30, 2014, the Company repurchased and retired 325,418 shares of its Class A common stock in a privately negotiated transaction at an aggregate purchase price of $8,143. The repurchases were made pursuant to stock repurchase programs approved by the Company's Board of Directors. Under the terms of the current stock repurchase program, the Company may repurchase up to an additional 434,125 shares of its Class A common stock. All other stock repurchases during the three and six months ended June 30, 2015 and 2014 were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants of the Company's 2006 Equity Compensation Plan.

On April 3, 2015, the Company filed a Registration Statement on Form S-8 to register an additional 2,000,000 shares of Class A common stock to be issued pursuant to the Company's 2015 Equity and Incentive Plan.

(9) Earnings per Common Share

Basic earnings per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period presented, excluding unvested restricted stock. Diluted earnings per share is calculated by dividing net income by the weighted average number of common shares determined for the basic earnings per share computation plus the dilutive effects of stock-based compensation using the treasury stock method.

23

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

The following table sets forth the computation of basic and diluted earnings per share for the three and six month periods ended June 30, 2015 and 2014.

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Net income	$	22,222	$	21,077	$	43,202	$	42,470
Weighted average common shares outstanding for basic earnings per share computation	45,143,122		44,044,260		45,260,104		44,021,166
Dilutive effects of stock-based compensation	463,564		531,703		582,935		573,689
Weighted average common shares outstanding for diluted earnings per common share computation	45,606,686		44,575,963		45,843,039		44,594,855
Basic earnings per common share	$	0.49	$	0.48	$	0.95	$	0.96
Diluted earnings per common share	$	0.49	$	0.47	$	0.94	$	0.95

The Company had 166,362 and 107,651 shares of unvested restricted stock as of June 30, 2015 and 2014, respectively, that were not included in the computation of diluted earnings per common share because performance conditions for vesting had not been met. The Company had no anti-dilutive stock options outstanding as of June 30, 2015 or June 30, 2014.

(10) Regulatory Capital

On July 2, 2013, the Board of Governors of the Federal Reserve Bank issued a final rule implementing a revised regulatory capital framework for U.S. banks in accordance with the Basel III international accord and satisfying related mandates under the Dodd-Frank Wall Street Reform and Consumer Protection Act . The revised regulatory capital framework ("Basel III ") includes a more stringent definition of capital and introduces a new common equity tier 1, or CET1, capital requirement, sets forth a comprehensive methodology for calculating risk-weighted assets, introduces a conservation buffer and sets out minimum capital ratios and overall capital adequacy standards. As a banking organization subject to the standardized approach, Basel III became effective for us on January 1, 2015. Certain deductions and adjustments to regulatory capital began to phase in starting January 1, 2015 and will be fully implemented on January 1, 2018. The capital conservation buffer phases in beginning January 1, 2016 and will be fully implemented on January 1, 2019.

CET1 capital predominantly includes common shareholders’ equity, less certain deductions for goodwill, intangible assets and deferred tax assets that arise from net operating losses and tax credit carry-forwards. We have elected to permanently exclude capital in accumulated other comprehensive income related to debt and equity securities classified as available-for-sale as well as for defined benefit post-retirement plans from CET1. Certain deductions and adjustments to CET1 capital, tier 1 capital and tier 2 capital are subject to phase-in through December 31, 2017.

24

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

As of June 30, 2015 and December 31, 2014, the Company exceeded all capital adequacy requirements to which it is subject. Actual capital amounts and ratios for the Company and its bank subsidiary, as of June 30, 2015 and December 31, 2014 are presented in the following tables:

	Actual				Adequately Capitalized				Well Capitalized (1)
	Amount		Ratio		Amount		Ratio		Amount		Ratio
June 30, 2015
Total risk-based capital:
Consolidated	$	924,408	15.4	%	$	481,244	8.0	%	$	601,555	10.0	%
FIB	857,522		14.3		479,416		8.0		599,270		10.0
Tier 1 risk-based capital:
Consolidated	835,198		13.9		360,933		6.0		481,244		8.0
FIB	776,594		13.0		359,562		6.0		479,416		8.0
Common equity tier 1 risk-based capital:
Consolidated	755,198		12.6		270,700		4.5		391,011		6.5
FIB	776,594		13.0		269,671		4.5		389,525		6.5
Leverage capital ratio:
Consolidated	835,198		10.1		330,350		4.0		412,938		5.0
FIB	776,594		9.4		329,180		4.0		411,475		5.0

	Actual				Adequately Capitalized				Well Capitalized (1)
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2014
Total risk-based capital:
Consolidated	$	897,769	16.2	%	$	444,685	8.0	%	$	555,856	10.0	%
FIB	832,907		15.1		442,468		8.0		553,085		10.0
Tier 1 risk-based capital:
Consolidated	807,229		14.5		222,343		4.0		333,514		6.0
FIB	754,708		13.7		221,234		4.0		331,851		6.0
Leverage capital ratio:
Consolidated	807,229		9.6		335,897		4.0		419,871		5.0
FIB	754,708		9.2		330,006		4.0		412,507		5.0

(1) The ratios for the well-capitalized requirement are only applicable to FIB. However, the Company manages its capital position as if the requirement applies to the consolidated entity and has presented the ratios as if they also applied on a consolidated basis.

(11) Commitments and Contingencies

Legal Proceedings. First Interstate Bank ("the Bank"), a wholly owned banking subsidiary of the Company, was a defendant in a lender liability lawsuit , Kelly Logging Inc. v. First Interstate Bank ("the case"). The case was tried in August 2014 in the Montana Fourth Judicial District, Missoula County in Missoula, Montana ("the court"). On August, 2014, a jury awarded damages to Kelly Logging of $17,047, which included $287 in compensatory damages and $16,760 in punitive damages. On October 1, 2014, a non-final judgment was entered in this matter in the amount of $17,047 plus reasonable attorney fees and interest, subject to the court's mandatory review of the jury's punitive damages award and rulings on pending post-trial motions. On April 21, 2015, the court ruled on the post-trial motions and issued an order upholding the jury's punitive damage award. The order also awarded plaintiff attorney's fees of $7,500 and costs of $91, for a final judgment amount of $24,638 plus interest.

25

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

The Company believes it has meritorious grounds for appeal of the final judgment and, in the event mandatory mediation of the case scheduled for third quarter 2015 is unsuccessful, intends to appeal to the Montana Supreme Court to set aside or substantially reduce the punitive damages award and grant the Bank a new trial. In recent appellate cases, the Montana Supreme Court has reduced excessive punitive damage awards to comply with the upper limit of the federal due process guidelines, or to an amount equal to less than ten times the compensatory damages awarded, in even the most egregious cases. Although the Company believes it has meritorious defenses and appellate issues for this litigation, these proceedings are subject to many uncertainties and, given their complexity and scope, the final outcome cannot be predicted and could have a material adverse effect on the consolidated financial condition, results of operations or liquidity of the Company. During third quarter 2014, the Company accrued $4,000 of litigation-related expense, which takes into consideration the federal due process guidelines related to punitive damage awards and the plaintiff's attorneys fees.

In the normal course of business, the Company is involved in various other claims and litigation. In the opinion of management, following consultation with legal counsel, the ultimate liability or disposition thereof of all other claims and litigation is not expected to have a material adverse effect on the consolidated financial condition, results of operations or liquidity of the Company.

Other Commitments. As of June 30, 2015, the Company had commitments under construction agreements of $2,433.

(12) Financial Instruments with Off-Balance Sheet Risk

The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the commitment contract. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. At June 30, 2015, commitments to extend credit to existing and new borrowers approximated $995,388, which included $528,943 on unused credit card lines and $357,999 with commitment maturities beyond one year.

Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. At June 30, 2015, the Company had outstanding standby letters of credit of $58,105. The estimated fair value of the obligation undertaken by the Company in issuing the standby letters of credit is included in other liabilities in the Company’s consolidated balance sheet.

(13) Supplemental Disclosures to Consolidated Statement of Cash Flows

The Company transferred loans of $4,396 and $4,399 to OREO during the six months ended June 30, 2015 and 2014, respectively.

The Company transferred internally originated mortgage servicing rights of $1,792 and $1,024 from loans to mortgage servicing assets during the six months ended June 30, 2015 and 2014, respectively.

The Company transferred loans of $10,619 to loans held for sale during the six months ended June 30, 2015.

26

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

(14) Other Comprehensive Income/Loss

The gross amounts of each component of other comprehensive income (loss) and the related tax effects are as follows:

	Pre-tax						Tax Expense (Benefit)						Net of Tax
Three Months Ended June 30,	2015			2014			2015			2014			2015			2014
Investment securities available-for sale:
Change in net unrealized gains/losses during period	$	(9,196	)	$	2,816		$	(3,618	)	$	1,108		$	(5,578	)	$	1,708
Reclassification adjustment for net gains  included in net income	(46		)	(17		)	(18		)	(7		)	(28		)	(10		)
Change in unamortized loss on available-  for-sale securities transferred into held-to-  maturity	451			—			177			—			274			—
Defined benefits post-retirement benefit plan:
Change in net actuarial loss	13			35			5			14			8			21
Total other comprehensive income (loss)	$	(8,778	)	$	2,834		$	(3,454	)	$	1,115		$	(5,324	)	$	1,719

	Pre-tax						Tax Expense (Benefit)						Net of Tax
Six Months Ended June 30,	2015			2014			2015			2014			2015			2014
Investment securities available-for sale:
Change in net unrealized gains/losses during period	$	1,412		$	17,167		$	555		$	6,755		$	857		$	10,412
Reclassification adjustment for net gains  included in net income	(52		)	(88		)	(20		)	(35		)	(32		)	(53		)
Change in unamortized loss on available-  for-sale securities transferred into held-to-  maturity	902			—			355			—			547			—
Defined benefits post-retirement benefit plan:
Change in net actuarial loss	28			70			11			28			17			42
Total other comprehensive income	$	2,290		$	17,149		$	901		$	6,748		$	1,389		$	10,401

The components of accumulated other comprehensive loss, net of income tax benefits, are as follows:

	June 30, 2015			December 31, 2014
Net unrealized loss on investment securities available-for-sale	$	(749	)	$	(2,121	)
Net actuarial loss on defined benefit post-retirement benefit plans	(396		)	(413		)
Net accumulated other comprehensive loss	$	(1,145	)	$	(2,534	)

27

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

(15) Fair Value Measurements

Financial assets and financial liabilities measured at fair value on a recurring basis are as follows:

			Fair Value Measurements at Reporting Date Using
As of June 30, 2015	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale:
Obligations of U.S. government agencies	$	621,020	$	—	$	621,020	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	971,435			—	971,435			—
Private mortgage-backed securities	288			—	288			—

			Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale:
Obligations of U.S. government agencies	$	720,933	$	—	$	720,933	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	990,666			—	990,666			—
Private mortgage-backed securities	325			—	325			—

There were no changes in valuation methodologies or transfers between levels of the fair value hierarchy during the six months ended June 30, 2015 or 2014.

The methodologies used by the Company in determining the fair values of each class of financial instruments are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date. The Company obtains fair value measurements for investment securities from an independent pricing service. The vendors chosen by the Company are widely recognized vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. The Company has documented and evaluated the pricing methodologies used by the vendors and maintains internal processes that regularly test valuations. These internal processes include obtaining and reviewing available reports on internal controls, evaluating the prices for reasonableness given market changes, obtaining and evaluating the inputs used in the model for a sample of securities, investigating anomalies and confirming determinations through discussions with the vendor. For investment securities, if needed, a broker may be utilized to determine the reported fair value. Further details on the methods used to estimate the fair value of each class of financial instruments above are discussed below.

Investment Securities Available-for-Sale. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the investment's terms and conditions, among other things.

Additionally, from time to time, certain assets are measured at fair value on a non-recurring basis. Adjustments to fair value generally result from the application of lower-of-cost-or-market accounting or write-downs of individual assets due to impairment.

28

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis.

				Fair Value Measurements at Reporting Date Using
As of June 30, 2015	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	50,131	$	—	$	—	$	50,131
Other real estate owned	5,623			—		—	5,623
Long-lived assets to be disposed of by sale	1,083			—		—	1,083
				Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	30,494	$	—	$	—	$	30,494
Other real estate owned	4,554			—		—	4,554
Long-lived assets to be disposed of by sale	1,083			—		—	1,083

Impaired Loans. Collateralized impaired loans are reported at the fair value of the underlying collateral if repayment is expected solely from collateral. The impaired loans are reported at fair value through specific valuation allowance allocations. In addition, when it is determined that the fair value of an impaired loan is less than the recorded investment in the loan, the carrying value of the loan is adjusted to fair value through a charge to the allowance for loan losses. Collateral values are estimated using independent appraisals and management estimates of current market conditions. As of June 30, 2015, certain impaired loans with a carrying value of $70,827 were reduced by specific valuation allowance allocations of $8,721 and partial loan charge-offs of $11,975 resulting in a reported fair value of $50,131. As of December 31, 2014, certain impaired loans with a carrying value of $45,046 were reduced by specific valuation allowance allocations of $5,792 and partial loan charge-offs of $8,760 resulting in a reported fair value of $30,494.

OREO.The fair values of OREO are estimated using independent appraisals and management estimates of current market conditions. Upon initial recognition, write-downs based on the foreclosed asset's fair value at foreclosure are reported through charges to the allowance for loan losses. Periodically, the fair value of foreclosed assets is remeasured with any subsequent write-downs charged to OREO expense in the period in which they are identified. Write-downs of $106 and $10 during the six months ended June 30, 2015 and 2014, respectively, were based on management's estimate of the current fair value of the properties.

Long-lived Assets to be Disposed of by Sale. Long-lived assets to be disposed of by sale are carried at the lower of carrying value or fair value less estimated costs to sell. The fair values of long-lived assets to be disposed of by sale are based upon observable market data and management estimates of current market conditions. As of June 30, 2015 and December 31, 2014, the Company had long-lived assets to be disposed of by sale with carrying values aggregating $1,785 that were reduced by write-downs of $702 resulting in an aggregate fair value of $1,083.

In addition, mortgage loans held for sale are required to be measured at the lower of cost or fair value. The fair value of mortgage loans held for sale is based upon binding contracts or quotes or bids from third party investors. As of June 30, 2015 and December 31, 2014, all mortgage loans held for sale were recorded at cost.

29

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair values:

As of June 30, 2015	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Impaired loans	$	50,131	Appraisal	Appraisal adjustment	0%	-	51%	(19%)
Other real estate owned	5,623		Appraisal	Appraisal adjustment	0%	-	50%	(15%)
Long-lived assets to be disposed of by sale	1,083		Appraisal	Appraisal adjustment	0%	-	9%	(5%)
As of December 31, 2014	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Impaired loans	$	30,494	Appraisal	Appraisal adjustment	0%	-	51%	(19%)
Other real estate owned	4,554		Appraisal	Appraisal adjustment	0%	-	50%	(15%)
Long-lived assets to be disposed of by sale	1,083		Appraisal	Appraisal adjustment	0%	-	9%	(5%)

The Company is required to disclose the fair value of financial instruments for which it is practical to estimate fair value. The methodologies for estimating the fair value of financial instruments that are measured at fair value on a recurring or non-recurring basis are discussed above. The methodologies for estimating the fair value of other financial instruments are discussed below. For financial instruments bearing a variable interest rate where no credit risk exists, it is presumed that recorded book values are reasonable estimates of fair value.

Financial Assets. Carrying values of cash, cash equivalents and accrued interest receivable approximate fair values due to the liquid and/or short-term nature of these instruments. Fair values for investment securities held-to-maturity are obtained from an independent pricing service, which considers observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the investment’s terms and conditions, among other things. Fair values of fixed rate loans and variable rate loans that reprice on an infrequent basis are estimated by discounting future cash flows using current interest rates at which similar loans with similar terms would be made to borrowers of similar credit quality. Carrying values of variable rate loans that reprice frequently, and with no change in credit risk, approximate the fair values of these instruments.

Financial Liabilities. The fair values of demand deposits, savings accounts, securities sold under repurchase agreements and accrued interest payable are the amounts payable on demand at the reporting date. The fair values of fixed-maturity certificates of deposit are estimated using external market rates currently offered for deposits with similar remaining maturities. The carrying values of the interest bearing demand notes to the United States Treasury are deemed an approximation of fair values due to the frequent repayment and repricing at market rates. The fixed and floating rate subordinated debentures, floating rate subordinated term loan, notes payable to the FHLB, fixed rate subordinated term debt, and capital lease obligation are estimated by discounting future cash flows using current rates for advances with similar characteristics.

Commitments to Extend Credit and Standby Letters of Credit. The fair value of commitments to extend credit and standby letters of credit, based on fees currently charged to enter into similar agreements, is not significant.

30

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

The estimated fair values of financial instruments that are reported in the Company's consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows:

					Fair Value Measurements at Reporting Date Using
As of June 30, 2015	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	506,434	$	506,434	$	506,434	$	—	$	—
Investment securities available-for-sale	1,592,743		1,592,743		—		1,592,743		—
Investment securities held-to-maturity	546,690		553,323		—		553,323		—
Accrued interest receivable	29,008		29,008		—		29,008		—
Mortgage servicing rights, net	14,654		28,320		—		28,320		—
Net loans	5,027,394		5,000,935		—		4,950,804		50,131
Total financial assets	$	7,716,923	$	7,710,763	$	506,434	$	7,154,198	$	50,131
Financial liabilities:
Total deposits, excluding time deposits	$	5,655,166	$	5,655,166	$	5,655,166	$	—	$	—
Time deposits	1,149,235		1,153,809		—		1,153,809		—
Securities sold under repurchase agreements	469,145		469,145		—		469,145		—
Other borrowed funds	3		3		—		3		—
Accrued interest payable	5,366		5,366		—		5,366		—
Long-term debt	43,068		41,584		—		41,584		—
Subordinated debentures held by subsidiary    trusts	82,477		76,393		—		76,393		—
Total financial liabilities	$	7,404,460	$	7,401,466	$	5,655,166	$	1,746,300	$	—

					Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	798,670	$	798,670	$	798,670	$	—	$	—
Investment securities available-for-sale	1,711,924		1,711,924		—		1,711,924		—
Investment securities held-to-maturity	575,186		584,533		—		584,533		—
Accrued interest receivable	27,063		27,063		—		27,063		—
Mortgage servicing rights, net	14,038		21,434		—		21,434		—
Net loans	4,823,243		4,800,725		—		4,770,231		30,494
Total financial assets	$	7,950,124	$	7,944,349	$	798,670	$	7,115,185	$	30,494
Financial liabilities:
Total deposits, excluding time deposits	$	5,767,992	$	5,767,992	$	5,767,992	$	—	$	—
Time deposits	1,238,220		1,244,324		—		1,244,324		—
Securities sold under repurchase agreements	502,250		502,250		—		502,250		—
Other borrowed funds	9		9		—		9		—
Accrued interest payable	5,833		5,833		—		5,833		—
Long-term debt	38,067		37,781		—		37,781		—
Subordinated debentures held by subsidiary    trusts	82,477		75,734		—		75,734		—
Total financial liabilities	$	7,634,848	$	7,633,923	$	5,767,992	$	1,865,931	$	—

31

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

(16) Recent Authoritative Accounting Guidance

ASU 2014-04 “Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure.” The amendments inASU 2014-04 clarify that an in-substance repossession or foreclosures occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (i) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (ii) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. The amendments in ASU 2014-04 also require interim and annual disclosure of both (i) the amount of foreclosed residential real estate property held by the creditor and (ii) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure. The Company adopted the amendments in ASU 2014-04 effective January 1, 2015 using a prospective transition method. Adoption of the amendments in ASU 2014-04 did not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2014-09 "Revenue from Contracts with Customers." The amendments in ASU 2014-09 introduce a new five-step revenue recognition model in which an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires disclosures sufficient to enable users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, including qualitative and quantitative disclosures about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The amendments in ASU 2014-09 are effective for the Company for fiscal years beginning after December 15, 2016, including interim periods within that reporting period, and may be adopted retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initial adoption recognized at the date of initial application. The Company is currently evaluating the new guidance to determine the impact it will have on its consolidated financial statements, results of operations or liquidity.

ASU 2014-11 "Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures." The amendments in ASU 2014-11 expand secured borrowing treatment for certain repurchase agreements. Under the amendments in ASU 2014-11, repurchase-to-maturity transactions and repurchase agreements executed as repurchase financing transactions are required to be accounted for as secured borrowings. ASU 2014-11 requires additional disclosures about certain transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the same counterparty. ASU 2014-11 also requires disclosure of the types of collateral pledged and liabilities associated with an entity's repurchase agreements, securities lending transactions and repurchase-to-maturity transactions accounted for as secured borrowings. The Company adopted the amendments in ASU 2014-11 are effective January 1, 2015. The adoption did not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2014-12 "Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could be Achieved after the Requisite Service Period." ASU 2014-12 amends Accounting Standards Codification ("ASC") Topic 718, Compensation-Stock Compensation, to clarify that a performance target that affects the vesting of a share-based payment award and that could be achieved after the requisite service period should be treated as a performance condition that affects the vesting of the award. ASU 2014-12 further clarifies that the requisite service period ends when the employees can cease rendering service and still be eligible to vest in the award if the performance target is achieved. The amendments in ASU 2014-12 are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. The amendments in ASU 2014-12 may be applied prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The amendments in ASU 2014-12 will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2014-14 "Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure." ASU 2014-14 updates ASC Subtopic 310-40, Receivables-Troubled Debt Restructurings by Creditors, to require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if (i) the loan has a government guarantee that is not separable from the loan before foreclosure; (ii) at the time of foreclosure, the creditor

32

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and, (iii) any amount of the claim that is determined on the basis of the fair value of the real estate is fixed at the time of foreclosure. ASU 2014-14 provides that, upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The Company adopted the amendments in ASU 2014-14 effective January 1, 2015, using a prospective transition method. Adoption of the amendments in ASU 2014-12 did not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2014-16 "Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share is More Akin to Debt or to Equity." The amendments in ASU 2014-16 clarify that an entity should consider all relevant terms and features-including the embedded derivative feature being evaluated for bifurcation-in evaluating the nature of the host contract within a hybrid financial instrument. The amendments further clarify that no single term or feature would necessarily determine the economic characteristics and risk of the host contract. Rather, the nature of the host contract depends upon the economic characteristics and risk of the entire hybrid financial instrument. The amendments in ASU 2014-16 are effective for the Company for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. The effects of initially adopting the amendments in ASU 2014-16 should be applied on a modified retrospective basis to existing hybrid financial instruments issued in the form of a share as of the beginning of the fiscal year for which the amendments are effective. Retrospective application is permitted to all relevant prior periods. The amendments in ASU 2014-16 will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2015-02 "Amendments to the Consolidation Analysis." The amendments in ASU 2015-02 (i) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, (ii) eliminate the presumption that a general partner should consolidate a limited partnership, (iii) affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and (iv) provide scope exceptions from consolidation guidance for reporting entities with interest in legal entities that are required to comply or operate in accordance with requirements of the Investment Company Act of 1940 for registered market funds. The amendments in ASU 2015-02 are effective for public entities for fiscal years, and interim periods within those years, beginning after December 15, 2015, with early adoption permitted. The amendments in ASU 2015-02, which may be adopted using a retrospective or modified retrospective approach, will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2015-03 "Simplifying the Presentation of Debt Issuance Costs." The amendments in ASU 2015-03 require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, rather than as a deferred charge. The amendments in ASU 2015-03 are effective for public entities for fiscal years, and interim periods within those years, beginning after December 15, 2015, and should be applied on a retrospective basis. The amendments in ASU 2015-03 will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2015-05 "Intangibles-Goodwill and Other Internal-Use Software." The amendments in ASU 2015-05 (i) provide guidance about whether a cloud computing arrangement includes a software license. Under the guidance in ASU 2015-05, if a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The guidance in ASU 2015-05 does not change generally accepted accounting principles for a customer's accounting for service contracts. The amendments in ASU 2015-05 are effective for public entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2015, with early adoption permitted. The amendments in ASU 2015-05, which may be adopted retrospectively or prospectively to all arrangements entered into or materially modified after the effective date. Adoption of the amendments in ASU 2015-05 will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

33

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except share and per share data)

ASU 2015-10 "Technical Corrections and Improvements." The amendments in ASU 2015-10 represent changes to clarify the codification, correct unintended application of guidance, or make minor improvements to the codification that are not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities. The amendments in ASU 2015-10 that require transition guidance are effective for all entities for fiscal years, and interim periods within those years, beginning after December 15, 2015, with early adoption permitted. All other amendments in ASU 2015-10 became effective in June 2015. The amendments in ASU 2015-03 will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

(17) Subsequent Events

Subsequent events have been evaluated for potential recognition and disclosure through the date financial statements were filed with the Securities and Exchange Commission. On July 23, 2015, the Company declared a quarterly dividend to common shareholders of $0.20 per share, to be paid on August 14, 2015 to shareholders of record as of August 3, 2015.

On July 24, 2015, the Company completed the acquisition of Absarokee, parent company of United Bank, and the subsequent merger of United Bank with and into FIB. For additional information regarding the acquisition and subsequent bank merger, see "Note 2 - Acquisitions."

No other events requiring recognition or disclosure were identified.

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Item 2.

MANAGEMENT’S DISCUSSION AND ANALYSIS OF

FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2014, including the audited financial statements contained therein, filed with the Securities and Exchange Commission, or SEC.

When we refer to “we,” “our,” and “us” in this report, we mean First Interstate BancSystem, Inc. and our consolidated subsidiaries, unless the context indicates that we refer only to the parent company, First Interstate BancSystem, Inc.

Cautionary Note Regarding Forward-Looking Statements and Factors that Could Affect Future Results

“Forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involve inherent risks and uncertainties. Any statements about our plans, objectives, expectations, strategies, beliefs, or future performance or events constitute forward-looking statements. Such statements are identified as those that include words or phrases such as “believes,” “expects,” “anticipates,” “plans,” “trend,” “objective,” “continue” or similar expressions or future or conditional verbs such as “will,” “would,” “should,” “could,” “might,” “may” or similar expressions. Forward-looking statements involve known and unknown risks, uncertainties, assumptions, estimates and other important factors that could cause actual results to differ materially from any results, performance or events expressed or implied by such forward-looking statements. The following factors, among others, may cause actual results to differ materially from current expectations in the forward-looking statements, including those set forth in this report: continuing or worsening business and economic conditions, adverse economic conditions affecting Montana, Wyoming and western South Dakota, credit losses, lending risk, adequacy of the allowance for loan losses, impairment of goodwill, failure to manage growth, access to low-cost funding sources, changes in interest rates, dependence on the Company’s management team, ability to attract and retain qualified employees, governmental regulation and changes in regulatory, tax and accounting rules and interpretations, failure of technology, cyber-security, unfavorable resolution of pending litigation, inability to meet liquidity requirements, environmental remediation and other costs, ineffective internal operational controls, competition, reliance on external vendors, litigation pertaining to fiduciary responsibilities, failure to effectively implement technology-driven products and services, soundness of other financial institutions, inability of our bank subsidiary to pay dividends, implementation of new lines of business or new product or service offerings, change in dividend policy, volatility of Class A common stock, decline in market price of Class A common stock, dilution as a result of future equity issuances, uninsured nature of any investment in Class A common stock, voting control of Class B stockholders, anti-takeover provisions, controlled company status, and, subordination of common stock to Company debt.

A more detailed discussion of each of the foregoing risks is included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014, filed February 27, 2015. These factors and the other risk factors described in the Company's periodic and current reports filed with the SEC from time to time, however, are not necessarily all of the important factors that could cause the Company's actual results, performance or achievements to differ materially from those expressed in or implied by any of the Company's forward-looking statements. Other unknown or unpredictable factors also could harm the Company's results. Investors and others are encouraged to read the more detailed discussion of the Company's risks contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.

All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements set forth above. Forward-looking statements speak only as of the date they are made and we do not undertake or assume any obligation to update publicly any of these statements to reflect actual results, new information or future events, changes in assumptions or changes in other factors affecting forward-looking statements, except to the extent required by applicable laws. If we update one or more forward-looking statements, no inference should be drawn that we will make additional updates with respect to those or other forward-looking statements.

Executive Overview

We are a financial holding company headquartered in Billings, Montana. As of June 30, 2015, we had consolidated assets of $8,386 million, deposits of $6,804 million, loans of $5,104 million and total stockholders’ equity of $925 million. We currently operate 83 banking offices, including detached drive-up facilities, in 45 communities located in Montana, Wyoming and western South Dakota. Through our bank subsidiary, First Interstate Bank, or FIB, we deliver a comprehensive range of banking products and services to individuals, businesses, municipalities and other entities throughout our market areas. Our customers participate in a wide variety of industries, including energy, tourism, agriculture, healthcare, professional services, education, governmental services, construction, mining, retail and wholesale trade.

35

Our Business

Our principal business activity is lending to and accepting deposits from individuals, businesses, municipalities and other entities. We derive our income principally from interest charged on loans and, to a lesser extent, from interest and dividends earned on investments. We also derive income from non-interest sources such as fees received in connection with various lending and deposit services; trust, employee benefit, investment and insurance services; mortgage loan originations, sales and servicing; merchant and electronic banking services; and from time to time, gains on sales of assets. Our principal expenses include interest expense on deposits and borrowings, operating expenses, provisions for loan losses and income tax expense.

Our loan portfolio consists of a mix of real estate, consumer, commercial, agricultural and other loans, including fixed and variable rate loans. Our real estate loans comprise commercial real estate, construction (including residential, commercial and land development loans), residential, agricultural and other real estate loans. Fluctuations in the loan portfolio are directly related to the economies of the communities we serve. While each loan originated generally must meet minimum underwriting standards established in our credit policies, lending officers are granted discretion within pre-approved limits in approving and pricing loans to assure that the banking offices are responsive to competitive issues and community needs in each market area. We fund our loan portfolio primarily with the core deposits from our customers, generally without utilizing brokered deposits and with minimal reliance on wholesale funding sources.

Recent Developments

On March 26, 2015, the Company entered into an agreement and plan of merger to acquire all of the outstanding stock of Absarokee Bancorporation, Inc., or Absarokee, a Montana-based bank holding company that operates one wholly-owned subsidiary bank, United Bank, with branches located in three Montana communities adjacent to the Company's existing market areas. The acquisition was completed on July 24, 2015. Pursuant to the terms of the Agreement and Plan of Merger to acquire Absarokee, the Company paid cash consideration of $7.2 million. As of the acquisition date, Absarokee had total assets of $73 million, loans of $38 million and deposits of $64 million. Immediately subsequent to the acquisition, the Company merged United Bank with and into its existing banking subsidiary, FIB. For additional information regarding the acquisition, see “Note 2 – Acquisitions” and "Note 17 – Subsequent Events" in the accompanying “Notes to Unaudited Consolidated Financial Statements” included in this report.

On July 2, 2013, the Board of Governors of the Federal Reserve Bank issued a final rule implementing a revised regulatory capital framework for U.S. banks in accordance with the Basel III international accord. As a banking organization subject to the standardized approach, the revised regulatory capital framework, or Basel III, became effective for us on January 1, 2015. Basel III includes a more stringent definition of capital and introduces a new common equity tier 1, or CET1, capital requirement, sets forth a comprehensive methodology for calculating risk-weighted assets, introduces a conservation buffer and sets out minimum capital ratios and overall capital adequacy standards. Certain deductions and adjustments to regulatory capital phase in starting January 1, 2015 and will be fully implemented on January 1, 2018. The capital conservation buffer phases in beginning January 1, 2016 and will be fully implemented on January 1, 2019. As of June 30, 2015 and December 31, 2014, we had capital levels that, in all cases, exceeded the well-capitalized guidelines. For additional information regarding our capital levels, see "Capital Resources and Liquidity Management" included herein and “Note 10 – Regulatory Capital” in the accompanying “Notes to Unaudited Consolidated Financial Statements” included in this report.

Primary Factors Used in Evaluating Our Business

As a banking institution, we manage and evaluate various aspects of both our financial condition and our results of operations. We monitor our financial condition and performance on a monthly basis at our holding company, at the Bank and at each banking office. We evaluate the levels and trends of the line items included in our balance sheet and statements of income, as well as various financial ratios that are commonly used in our industry. We analyze these ratios and financial trends against both our own historical levels and the financial condition and performance of comparable banking institutions in our region and nationally.

Results of Operations

Principal factors used in managing and evaluating our results of operations include return on average equity, net interest income, non-interest income, non-interest expense and net income. Net interest income is affected by the level of interest rates, changes in interest rates and changes in the volume and composition of interest earning assets and interest bearing liabilities. The most significant impact on our net interest income between periods is derived from the interaction of changes in the rates earned or paid on interest earning assets and interest bearing liabilities, which we refer to as interest rate spread. The volume of loans, investment securities and other interest earning assets, compared to the volume of interest bearing deposits and indebtedness, combined with the interest rate spread, produces changes in our net interest income between periods. Non-interest bearing sources of funds, such as demand deposits and stockholders’ equity, also support earning assets.

36

The impact of free funding sources is captured in the net interest margin, which is calculated as net interest income divided by average earning assets. We evaluate our net interest income on factors that include the yields on our loans and other earning assets, the costs of our deposits and other funding sources, the levels of our net interest spread and net interest margin and the provisions for loan losses required to maintain our allowance for loan losses at an adequate level.

We seek to increase our non-interest income over time and we evaluate our non-interest income relative to the trends of the individual types of non-interest income in view of prevailing market conditions.

We manage our non-interest expenses in consideration of growth opportunities and our community banking model that emphasizes customer service and responsiveness. We evaluate our non-interest expense on factors that include our non-interest expense relative to our average assets, our efficiency ratio and the trends of the individual categories of non-interest expense.

Finally, we seek to increase our net income and provide favorable shareholder returns over time, and we evaluate our net income relative to the performance of other bank holding companies on factors that include return on average assets, return on average equity, total shareholder return and growth in earnings.

Financial Condition

Principal areas of focus in managing and evaluating our financial condition include liquidity, the diversification and quality of our loans, the adequacy of our allowance for loan losses, the diversification and terms of our deposits and other funding sources, the re-pricing characteristics and maturities of our assets and liabilities, including potential interest rate exposure and the adequacy of our capital levels. We seek to maintain sufficient levels of cash and investment securities to meet potential payment and funding obligations, and we evaluate our liquidity on factors that include the levels of cash and highly liquid assets relative to our liabilities, the quality and maturities of our investment securities, the ratio of loans to deposits and any reliance on brokered certificates of deposit or other wholesale funding sources.

We seek to maintain a diverse and high quality loan portfolio and evaluate our asset quality on factors that include the allocation of our loans among loan types, credit exposure to any single borrower or industry type, non-performing assets as a percentage of total loans and OREO, and loan charge-offs as a percentage of average loans. We seek to maintain our allowance for loan losses at a level adequate to absorb probable losses inherent in our loan portfolio at each balance sheet date, and we evaluate the level of our allowance for loan losses relative to our overall loan portfolio and the level of non-performing loans and potential charge-offs.

We seek to fund our assets primarily using core customer deposits spread among various deposit categories, and we evaluate our deposit and funding mix on factors that include the allocation of our deposits among deposit types, the level of our non-interest bearing deposits, the ratio of our core deposits (i.e. excluding time deposits above $100,000) to our total deposits and our reliance on brokered deposits or other wholesale funding sources, such as borrowings from other banks or agencies. We seek to manage the mix, maturities and re-pricing characteristics of our assets and liabilities to maintain relative stability of our net interest rate margin in a changing interest rate environment, and we evaluate our asset-liability management using models to evaluate the changes to our net interest income under different interest rate scenarios.

Finally, we seek to maintain adequate capital levels to absorb unforeseen operating losses and to help support the growth of our balance sheet. We evaluate our capital adequacy using the regulatory and financial capital ratios including leverage capital ratio, tier 1 risk-based capital ratio, total risk-based capital ratio, common equity tier 1 risk-based capital ratio and tangible common equity to tangible assets.

Critical Accounting Estimates and Significant Accounting Policies

Our consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States and follow general practices within the industries in which we operate. Application of these principles requires management to make estimates, assumptions and judgments that affect the amounts reported in the consolidated financial statements and accompanying notes. The most significant accounting policies we follow are summarized in Note 1 of the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2014.

Our critical accounting estimates are summarized below. Management considers an accounting estimate to be critical if: (1) the accounting estimate requires management to make particularly difficult, subjective and/or complex judgments about matters that are inherently uncertain and (2) changes in the estimate that are reasonably likely to occur from period to period, or the use of different estimates that management could have reasonably used in the current period, would have a material impact on our consolidated financial statements, results of operations or liquidity.

37

Allowance for Loan Losses

The provision for loan losses creates an allowance for loan losses known and inherent in the loan portfolio at each balance sheet date. The allowance for loan losses represents management’s estimate of probable credit losses inherent in the loan portfolio.

We perform a quarterly assessment of the risks inherent in our loan portfolio, as well as a detailed review of each significant loan with identified weaknesses. Based on this analysis, we record a provision for loan losses in order to maintain the allowance for loan losses at appropriate levels. In determining the allowance for loan losses, we estimate losses on specific loans, or groups of loans, where the probable loss can be identified and reasonably determined. Determining the amount of the allowance for loan losses is considered a critical accounting estimate because it requires significant judgment and the use of subjective measurements, including management’s assessment of the internal risk classifications of loans, historical loan loss rates, changes in the nature of the loan portfolio, overall portfolio quality, industry concentrations, delinquency trends and the impact of current local, regional and national economic factors on the quality of the loan portfolio. Changes in these estimates and assumptions are possible and may have a material impact on our allowance, and therefore our consolidated financial statements or results of operations. The allowance for loan losses is maintained at an amount we believe is sufficient to provide for estimated losses inherent in our loan portfolio at each balance sheet date, and fluctuations in the provision for loan losses result from management’s assessment of the adequacy of the allowance for loan losses. Management monitors qualitative and quantitative trends in the loan portfolio, including changes in the levels of past due, internally classified and non-performing loans. Note 1 of the Notes to Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2014 describes the methodology used to determine the allowance for loan losses. A discussion of the factors driving changes in the amount of the allowance for loan losses is included herein under the heading “Asset Quality."

Goodwill

The excess purchase price over the fair value of net assets from acquisitions, or goodwill, is evaluated for impairment at least annually and on an interim basis if an event or circumstance indicates that it is likely impairment has occurred. In any given year, the Company may elect to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is in excess of its carrying value. If it is not more likely than not that the fair value of the reporting unit is in excess of the carrying value, or if the Company elects to bypass the qualitative assessment, a two-step quantitative impairment test is performed. In performing a quantitative test for impairment, the fair value of net assets is estimated based on an analysis of our market value, discounted cash flows and peer values. Determining the fair value of goodwill is considered a critical accounting estimate because of its sensitivity to market-based economics. In addition, any allocation of the fair value of goodwill to assets and liabilities requires significant management judgment and the use of subjective measurements. Variability in market conditions and key assumptions or subjective measurements used to estimate and allocate fair value are reasonably possible and could have a material impact on our consolidated financial statements or results of operations. Note 1 of the Notes to the Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2014 describes our accounting policy with regard to goodwill.

Our annual evaluation of goodwill for impairment is performed as of July 1st each year. Upon completion of the most recent evaluation, it was determined that the estimated fair value of net assets was greater than the carrying value of the Company. We will continue to monitor our performance and evaluate our goodwill for impairment annually or more frequently as needed.

Fair Values of Loans Acquired in Business Combinations

Loans acquired in business combinations are initially recorded at fair value with no carryover of the related allowance for credit losses. Determining the fair value of the loans involves estimating the amount and timing of principal and interest cash flows initially expected to be collected on the loans and discounting those cash flows at an appropriate market rate of interest. Going forward, the Company continues to evaluate reasonableness of expectations for the timing and the amount of cash to be collected. Subsequent decreases in expected cash flows may result in changes in the amortization or accretion of fair market value adjustments, and in some cases may result in the loan being considered impaired.  For collateral dependent loans with deteriorated credit quality, the Company estimates the fair value of the underlying collateral of the loans. These values are discounted using market derived rates of return, with consideration given to the period of time and costs associated with the foreclosure and disposition of the collateral. Note 1 of the Notes to the Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2014 describes our accounting policy with regard to acquired loans.

38

Results of Operations

The following discussion and analysis is intended to provide greater details of the results of our operations and financial condition.

Net Interest Income. Our net interest income on a fully taxable equivalent, or FTE, basis increased $5.6 million, or 9.2%, to $66.4 million during the three months ended June 30, 2015, as compared to $60.8 million for the same period in 2014, and $11.8 million, or 9.8%, to $131.8 million during the six months ended June 30, 2015, as compared to $120.0 million for the same period in 2014. These increases were primarily attributable to growth in average interest earning assets as a result of the July 2014 acquisition of Mountain West Financial Corp, or Mountain West, in which we acquired cash and cash equivalents totaling $74 million, loans totaling $360 million and investment securities totaling $105 million. In addition,we experienced organic growth in total loans of approximately 5.3% from June 30, 2014 through June 30, 2015, which also positively impacted our quarter-to-date and year-to-date net FTE interest income.

Also positively impacting our net interest income during the three and six months ended June 30, 2015, as compared to the same periods in the prior year, was interest accretion related to the fair valuation of acquired loans. Interest accretion related to the fair valuation of acquired loans was $1.6 million during the three months ended June 30, 2015, of which $470 thousand was the result of early loan payoffs. For the six months ended June 30, 2015, interest accretion related to the fair valuation of acquired loans was $2.7 million, of which $821 thousand was the result of early loan payoffs.

Despite increases in our net interest income, our net FTE interest margin ratio decreased 7 basis points to 3.47% for the three months ended June 30, 2015, as compared to 3.54% for the same period in 2014, and 8 basis points to 3.45% for the six months ended June 30, 2015, as compared to 3.53% during the same period in 2014. Decreases in net FTE interest margin ratio during the three and six months ended June 30, 2015, as compared to the same periods in 2014, were primarily due to lower yields earned on loans and investment securities, which were partially offset by increases in the average outstanding interest earning assets and reductions in funding costs. Exclusive of the fair value accretion resulting from the early payoff of acquired loans and recoveries of previously charged-off interest, our net interest margin ratio was 3.40% during the three months ended June 30, 2015, as compared to 3.46% for the same period in 2014, and 3.39% during the six months ended June 30, 2015, as compared to 3.48% during the same period in 2014.

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The following tables present, for the periods indicated, condensed average balance sheet information, together with interest income and yields earned on average interest earning assets and interest expense and rates paid on average interest bearing liabilities.

Average Balance Sheets, Yields and Rates
(Dollars in thousands)	Three Months Ended June 30,
	2015							2014
	Average Balance		Interest			Average Rate		Average Balance		Interest			Average Rate
Interest earning assets:
Loans (1) (2)	$	4,991,416	$	60,911		4.89	%	$	4,436,786	$	56,019		5.06	%
Investment securities (2)	2,319,636		9,642			1.67		2,091,438		9,017			1.73
Interest bearing deposits in banks	369,345		271			0.29		356,911		225			0.25
Federal funds sold	3,168		5			0.63		1,958		3			0.61
Total interest earnings assets	7,683,565		70,829			3.70		6,887,093		65,264			3.80
Non-earning assets	743,545							669,029
Total assets	$	8,427,110						$	7,556,122
Interest bearing liabilities:
Demand deposits	$	2,086,443	$	524		0.10	%	$	1,878,483	$	513		0.11	%
Savings deposits	1,874,508		624			0.13		1,653,034		598			0.15
Time deposits	1,175,753		2,091			0.71		1,148,832		2,216			0.77
Repurchase agreements	448,810		53			0.05		438,744		63			0.06
Other borrowed funds	7		—			—		8		—			—
Long-term debt	43,039		538			5.01		36,897		476			5.17
Subordinated debentures held by subsidiary trusts	82,477		600			2.92		82,477		592			2.88
Total interest bearing liabilities	5,711,037		4,430			0.31		5,238,475		4,458			0.34
Non-interest bearing deposits	1,739,329							1,443,239
Other non-interest bearing liabilities	55,515							44,291
Stockholders’ equity	921,229							830,117
Total liabilities and stockholders’ equity	$	8,427,110						$	7,556,122
Net FTE interest income			66,399							60,806
Less FTE adjustments (2)			(1,111		)					(1,079		)
Net interest income from consolidated statements of income			$	65,288						$	59,727
Interest rate spread						3.39	%						3.46	%
Net FTE interest margin (3)						3.47	%						3.54	%
Cost of funds, including non-interest bearing demand deposits (4)						0.24	%						0.27	%

(1) Average loan balances include non-accrual loans. Interest income on loans includes amortization of deferred loan fees net of deferred loan costs, which is not material.

(2) Interest income and average rates for tax exempt loans and securities are presented on a FTE basis.

(3) Net FTE interest margin during the period equals (i) the difference between annualized interest income on interest earning assets and the annualized interest expense on interest bearing liabilities, divided by (ii) average interest earning assets for the period.

(4) Calculated by dividing total annualized interest on interest bearing liabilities by the sum of total interest bearing liabilities plus non-interest bearing deposits.

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Average Balance Sheets, Yields and Rates
(Dollars in thousands)	Six Months Ended June 30,
	2015							2014
	Average Balance		Interest			Average Rate		Average Balance		Interest			Average Rate
Interest earning assets:
Loans (1) (2)	$	4,943,547	$	120,727		4.92	%	$	4,391,143	$	110,211		5.06	%
Investment securities (2)	2,307,104		19,283			1.69		2,099,993		18,387			1.77
Interest bearing deposits in banks	457,475		660			0.29		362,815		456			0.25
Federal funds sold	2,176		7			0.65		1,531		4			0.53
Total interest earnings assets	7,710,302		140,677			3.68		6,855,482		129,058			3.80
Non-earning assets	747,788							666,748
Total assets	$	8,458,090						$	7,522,230
Interest bearing liabilities:
Demand deposits	$	2,087,815	$	1,030		0.10	%	$	1,858,211	$	1,025		0.11	%
Savings deposits	1,878,640		1,252			0.13		1,646,296		1,193			0.15
Time deposits	1,198,048		4,266			0.72		1,160,783		4,533			0.79
Repurchase agreements	464,083		107			0.05		447,601		129			0.06
Other borrowed funds	5		—			—		7		—			—
Long-term debt	40,589		1,052			5.23		36,903		949			5.19
Subordinated debentures held by subsidiary trusts	82,477		1,190			2.91		82,477		1,180			2.89
Total interest bearing liabilities	5,751,657		8,897			0.31		5,232,278		9,009			0.35
Non-interest bearing deposits	1,731,210							1,423,639
Other non-interest bearing liabilities	60,924							47,223
Stockholders’ equity	914,299							819,090
Total liabilities and stockholders’ equity	$	8,458,090						$	7,522,230
Net FTE interest income			131,780							120,049
Less FTE adjustments (2)			(2,167		)					(2,186		)
Net interest income from consolidated statements of income			$	129,613						$	117,863
Interest rate spread						3.37	%						3.45	%
Net FTE interest margin (3)						3.45	%						3.53	%
Cost of funds, including non-interest bearing demand deposits (4)						0.24	%						0.27	%

(1) Average loan balances include non-accrual loans. Interest income on loans includes amortization of deferred loan fees net of deferred loan costs, which is not material.

(2) Interest income and average rates for tax exempt loans and securities are presented on a FTE basis.

(3) Net FTE interest margin during the period equals (i) the difference between annualized interest income on interest earning assets and the annualized interest expense on interest bearing liabilities, divided by (ii) average interest earning assets for the period.

(4) Calculated by dividing total annualized interest on interest bearing liabilities by the sum of total interest bearing liabilities plus non-interest bearing deposits.

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The table below sets forth, for the periods indicated, a summary of the changes in interest income and interest expense resulting from estimated changes in average asset and liability balances (volume) and estimated changes in average interest rates (rate). Changes which are not due solely to volume or rate have been allocated to these categories based on the respective percent changes in average volume and average rate as they compare to each other.

Analysis of Interest Changes Due to Volume and Rates
(Dollars in thousands)	Three Months Ended June 30, 2015 compared with Three Months Ended June 30, 2014								Six Months Ended June 30, 2015 compared with Six Months Ended June 30, 2014
	Volume		Rate			Net			Volume		Rate			Net
Interest earning assets:
Loans (1)	$	7,002	$	(2,110	)	$	4,892		$	13,864	$	(3,348	)	$	10,516
Investment securities (1)	984		(359		)	625			1,814		(919		)	895
Interest bearing deposits in banks	8		38			46			119		85			204
Federal funds sold	2		—			2			2		1			3
Total change	7,996		(2,431		)	5,565			15,799		(4,181		)	11,618
Interest bearing liabilities:
Demand deposits	57		(46		)	11			127		(122		)	5
Savings deposits	80		(54		)	26			168		(109		)	59
Time deposits	52		(177		)	(125		)	146		(413		)	(267		)
Repurchase agreements	1		(11		)	(10		)	5		(27		)	(22		)
Long-term debt	79		(17		)	62			95		8			103
Subordinated debentures held by subsidiary trusts	—		8			8			—		10			10
Total change	269		(297		)	(28		)	541		(653		)	(112		)
Increase (decrease) in FTE net interest income	$	7,727	$	(2,134	)	$	5,593		$	15,258	$	(3,528	)	$	11,730

(1)Interest income for tax exempt loans and securities are presented on a FTE basis.

Provision for Loan Losses. During the three and six months ended June 30, 2015, we recorded a provision for loan losses of $1.3 million and $2.4 million, as compared to the reversal of provision for loan losses of $2.0 million and $7.0 million recorded during the same respective periods in 2014. The increase in provision is reflective of loan growth, increases in specific reserves on impaired loans and lower levels of recoveries of previously charged-off loans. For information regarding our non-performing loans, see “Non-Performing Assets” included herein.

Non-interest Income. Our principal sources of non-interest income include other service charges, commissions and fees; income from the origination and sale of loans; wealth management revenues; and, service charges on deposit accounts. Non-interest income increased $5.2 million, or 19.6%, to $31.8 million for the three months ended June 30, 2015, as compared to $26.6 million for the same period in 2014, and $8.9 million, or 17.5%, to $59.6 million for the six months ended June 30, 2015, as compared to $50.7 million during the same period in 2014. Significant components of these increases are discussed below.

Other service charges, commissions and fees primarily include debit and credit card interchange income, mortgage loan servicing fee income, insurance and other commissions and ATM service charge revenues. Other service charges, commissions and fees increased $1.5 million, or 15.2%, to $11.2 million during the three months ended June 30, 2015, as compared to $9.7 million for the same period in 2014, and $2.2 million, or 11.6%, to $21.0 million for the six months ended June 30, 2015, as compared to $18.9 million during the same period in 2014. These increases were primarily due to additional interchange revenue resulting from higher debit and credit card transaction volumes.

Income from the origination and sale of loans increased $2.4 million, or 38.0%, to $8.8 million during the three months ended June 30, 2015, as compared to $6.4 million during the same period in 2014, and $3.7 million, or 33.2%, to $14.7 million during the six months ended June 30, 2015, as compared to $11.0 million during the same period in 2014. During second quarter 2015, we sold $10.6 million of seasoned portfolio loans at an aggregate gain of $410 thousand. The remaining quarter-to-date and year-to-date increases in income from the origination and sale of loans, as compared to the same periods in 2014, were primarily the result of increased demand in our market areas for both refinancing loans and loans for home purchases. Our total mortgage loans production increased approximately 39% during the six months ended June 30, 2015, as compared to the same period in 2014, with loans originated for home purchases accounting for approximately 62% of our mortgage loan production, as compared to approximately 73% during the same period in 2014.

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Wealth management revenues are comprised principally of fees earned for management of trust assets and investment services revenues. Fees earned for management of trust assets are generally based on the market value of assets managed. Wealth management revenues increased $288 thousand, or 6.2%, to $4.9 million during the three months ended June 30, 2015, as compared to $4.6 million during the same period in 2014, and $770 thousand, or 8.5%, to $9.8 million during the six months ended June 30, 2015, as compared to $9.1 million during the same period in 2014. Increases in wealth management revenues during the three and six months ended June 30, 2015, as compared to the same periods in 2014, were due to the combined effects of the addition of new wealth management customers and increases in the market values of assets under trust management.

Other income increased $862 thousand, or 44.5%, to $2.8 million during the three months ended June 30, 2015, as compared to $1.9 million during the same period in 2014, and $2.1 million, or 54.8%, to $5.9 million during the six months ended June 30, 2015, as compared to $3.8 million during the same period in 2014. During second quarter 2015, we recorded a gain of $863 thousand on the sale of land. In addition, during first quarter 2015, we reached a settlement on and reversed a $1.0 million accrual related to secondary investor claims assumed as part of the July 2014 acquisition of Mountain West.

Non-interest Expense. Non-interest expense increased $6.1 million, or 10.8%, to $62.0 million for the three months ended June 30, 2015, as compared to $55.9 million for the same period in 2014, and $11.3 million, or 10.3%, to $121.6 million during the six months ended June 30, 2015, as compared to $110.3 million in the same period in 2014. Significant components of these increases are discussed below.

Salaries and wages expense increased $1.7 million, or 6.8%, to $26.1 million during the three months ended June 30, 2015, as compared to $24.4 million during the same period in 2014, and $4.6 million, or 9.7%, to $51.4 million during the six months ended June 30, 2015, as compared to $46.9 million during the same period in 2014. Quarter-to-date and year-to-date increases in salaries and wages expense, as compared to the prior year, were primarily the result of increased personnel costs associated with the Mountain West acquisition in July 2014, inflationary wage increases and higher commissioned pay reflective of increased mortgage loan origination during the first half of 2015.

Employee benefits expense increased $906 thousand, or12.6%, to $8.1 million for the three months ended June 30, 2015, as compared to $7.2 million during the same period in 2014, and $373 thousand, or 2.4%, to $15.9 million during the six months ended June 30, 2015, as compared to $15.5 million during the same period in 2014. Increases in employee benefits expense during the three and six months ended June 30, 2015, as compared to the same periods in 2014, were reflective of increased benefits costs associated with the Mountain West acquisition in July 2014 and increases in group health insurance expense.

Furniture and equipment expense increased $546 thousand, or 17.3%, to $3.7 million for the three months ended June 30, 2015, as compared to $3.2 million during the same period in 2014, and $1.1 million, or 17.9%, to $7.5 million during the six months ended June 30, 2015, as compared to $6.4 million during the same period in the prior year. These increases were primarily due to additional software costs associated with the implementation of new systems placed into service during the last half of 2014 to assist in accounting for acquired loans, process mortgage loans and automate certain reconciliation functions.

Net OREO income increased $689 thousand, or 514.2%, to $823 thousand during the three months ended June 30, 2015, as compared to $134 thousand during the same period in 2014, and $731 thousand, or 477.8%, to $884 thousand during the six months ended June 30, 2015, as compared to $153 thousand in the same period in 2014, primarily due to increases in net gains recognized on the sale of OREO properties. During the three and six months ended June 30, 2015, we recorded net gains on the sale of OREO properties of $986 thousand and $1.7 million, respectively, as compared to net gains on the sale of OREO properties of $331 thousand and $766 thousand recorded during the same respective periods in 2014.

Core deposit intangible amortization expense increased $500 thousand, or 141.2%, to $854 thousand during the three months ended June 30, 2015, as compared to $354 thousand during the same period in 2014, and $1.0 million, or 141.4%, to $1.7 million during the six months ended June 30, 2015, as compared to $708 thousand during the same period in 2014. Increases in core deposit amortization expense were due to the amortization of core deposit intangible assets recorded in conjunction with the acquisition of Mountain West in July 2014.

Other expense increased $2.7 million, or 25.3%, to $13.6 million during the three months ended June 30, 2015, as compared to $10.8 million during the same period in 2014, and $4.1 million, or 19.1%, to $25.4 million during the six months ended June 30, 2015, as compared to $21.3 million for the same period in 2014. During second quarter 2015, we recorded a one-time contract termination fee of $876 thousand related to a change in payment service provider. In addition, fraud loses increased $416 thousand, or 137.3%, to $719 thousand during second quarter 2015, as compared to $303 thousand the same period in 2014, and $456 thousand, or 98.7%, to $918 thousand during the six months ended June 30, 2015, as compared to $462 thousand during the same period in 2014, primarily due to unusually high fraudulent credit card activity. The remaining quarter-to-date and year-to-date increases in other expense, were primarily due to the additional operating costs associated with branches acquired in the July 2014 acquisition of Mountain West, increases in advertising costs due to fluctuations in the timing of advertising campaigns and higher travel and legal costs.

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During the six months ended June 30, 2015 and 2014, we recorded $63 thousand and $597 thousand, respectively, of acquisition-related expenses. These acquisition-related expenses primarily include legal and professional fees and travel expenses. For additional information regarding acquisitions, see "Recent Developments" included herein and “Note 2 – Acquisitions” in the accompanying “Notes to Unaudited Consolidated Financial Statements” included in this report.

Income Tax Expense. Our effective federal income tax rate was 29.5% for the six months ended June 30, 2015 and 30.7% for the six months ended June 30, 2014. State income tax applies primarily to pretax earnings generated within Montana and South Dakota. Our effective state tax rate was 4.2% for the six months ended June, 2015 and 2014. Decreases in effective federal income tax rates are primarily due to tax credits received on investments in new markets tax credit and low income housing projects during 2015 and the last half of 2014.

Financial Condition

Total assets decreased $224 million, or 2.6%, to $8,386 million as of June 30, 2015, from $8,610 million as of December 31, 2014. Absent deposit growth during the first six months of 2015, loan growth was funded through available funds resulting in decreases in cash and cash equivalents and investment securities from December 31, 2014 to June 30, 2015. Significant fluctuations in balance sheet accounts are discussed below.

Loans. Total loans increased $207 million, or 4.2%, to $5,104 million as of June 30, 2015, as compared to $4,897 million December 31, 2014, with the most notable growth occurring in commercial, commercial real estate, indirect consumer and agricultural loans.

Continuing business expansion in our market areas and the movement of completed commercial construction projects from construction loans to permanent financing resulted in increases in the commercial and commercial real estate loan portfolios. Commercial loans increased $79 million, or 10.7%, to $819 million as of June 30, 2015, from $740 million as of December 31, 2014, and commercial real estate loans increased $65 million, or 3.9%, to $1.7 billion as of June 30, 2015, from $1.6 billion as of December 31, 2014.

Indirect consumer loans grew $37 million or 6.6%, to $589 million as of June 30, 2015, from $553 million as of December 31, 2014. Management attributes this increase to the combined impact of heightened consumer demand for recreational vehicles and increased dealer volume resulting from the our historical expansion efforts within our existing market areas.

Agricultural loans increased $18 million, or 14.2%, to $143 million as of June 30, 2015, from $125 million as of December 31, 2014. Management attributes this increase to seasonal increases in agricultural credit lines that typically occur during the second and third quarters of each year. Agricultural real estate loans decreased $9 million, or 5.5%, to $159 million as of June 30, 2015, from $168 million as of December 31, 2014, primarily due to scheduled loan repayments.

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Non-performing Assets. Non-performing assets include non-accrual loans, loans contractually past due 90 days or more and still accruing interest and OREO. The following table sets forth information regarding non-performing assets as of the dates indicated:    

Nonperforming Assets and Troubled Debt Restructurings
(Dollars in thousands)	June 30, 2015			March 31, 2015			December 31, 2014			September 30, 2014			June 30, 2014
Non-performing loans:
Non-accrual loans	$	70,848		$	73,941		$	62,182		$	71,915		$	79,166
Accruing loans past due 90 days or more	2,153			5,175			2,576			1,348			1,494
Total non-performing loans	73,001			79,116			64,758			73,263			80,660
OREO	11,773			15,134			13,554			18,496			16,425
Total non-performing assets	$	84,774		$	94,250		$	78,312		$	91,759		$	97,085
Troubled debt restructurings not included above	$	15,127		$	16,070		$	20,952		$	20,956		$	23,531
Non-performing loans to total loans	1.43		%	1.61		%	1.32		%	1.51		%	1.79		%
Non-performing assets to total loans and OREO	1.66		%	1.91		%	1.59		%	1.88		%	2.15		%
Non-performing assets to total assets	1.01		%	1.11		%	0.91		%	1.08		%	1.27		%

Non-performing loans. Non-performing loans include non-accrual loans and loans contractually past due 90 days or more. We monitor and evaluate collateral values on non-performing loans quarterly. Appraisals are required on all non-performing loans every 18-24 months, or sooner as conditions necessitate. We monitor real estate values by market for our larger market areas. Based on trends in real estate values, adjustments may be made to the appraised value based on time elapsed between the appraisal date and the impairment analysis or a new appraisal may be ordered. Appraised values in our smaller market areas may be adjusted based on trends identified through discussions with local realtors and appraisers. Appraisals are also adjusted for selling costs. The adjusted appraised value is then compared to the loan balance and any resulting shortfall is recorded in the allowance for loan losses as a specific valuation allowance. Overall increases in specific valuation allowances will result in higher provisions for loan losses. Provisions for loan losses are also impacted by changes in the historical or general valuation elements of the allowance for loan losses.

The following table sets forth the allocation of our non-performing loans among our various loan categories as of the dates indicated:

Non-Performing Loans by Loan Type
(Dollars in thousands)	June 30, 2015		Percent of Total		December 31, 2014		Percent of Total
Real estate:
Commercial	$	26,700	36.6	%	$	27,700	42.9	%
Construction:			.
Land acquisition and development	7,919		10.8	%	8,252		12.7	%
Commercial	3,443		4.7	%	2,564		4.0	%
Residential	332		0.5	%	272		0.4	%
Total construction	11,694		16.0	%	11,088		17.1	%
Residential	3,497		4.8	%	4,554		7.0	%
Agricultural	6,784		9.3	%	6,842		10.6	%
Total real estate	48,675		66.7	%	50,184		77.5	%
Consumer	1,568		2.1	%	1,282		2.0	%
Commercial	21,812		29.9	%	12,846		19.8	%
Agricultural	635		0.9	%	446		0.7	%
Other	311		0.4	%	—		—	%
Total non-performing loans	$	73,001	100.0	%	$	64,758	100.0	%

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Non-accrual loans. We generally place loans, excluding acquired credit impaired loans, on non-accrual when they become 90 days past due, unless they are well secured and in the process of collection. When a loan is placed on non-accrual status, any interest previously accrued but not collected is reversed from income. If all loans on non-accrual had been current in accordance with their original terms, gross income of approximately $1.6 million and $2.2 million would have been accrued for the six months ended June 30, 2015 and 2014, respectively.

Non-accrual loans, the largest component of non-performing loans, increased $9 million, or 13.9%, to $71 million as of June 30, 2015, from $62 million as of December 31, 2014, primarily due to the placement of the loans of one commercial and one commercial real estate borrower on non-accrual status.

OREO. OREO consists of real property acquired through foreclosure on the collateral underlying defaulted loans. We initially record OREO at fair value less estimated selling costs. Any excess of loan carrying value over the fair value of the real estate acquired is recorded as a charge against the allowance for loan losses. Estimated losses that result from the ongoing periodic valuation of these properties are charged to earnings in the period in which they are identified. The fair values of OREO properties are estimated using appraisals and management estimates of current market conditions. OREO properties are appraised every 18-24 months unless deterioration in local market conditions indicates the need to obtain new appraisals sooner. OREO properties are evaluated by management quarterly to determine if additional write-downs are appropriate or necessary based on current market conditions. Quarterly evaluations include a review of the most recent appraisal of the property and reviews of recent appraisals and comparable sales data for similar properties in the same or adjacent market areas. Commercial and agricultural OREO properties are listed with unrelated third party professional real estate agents or brokers local to the areas where the marketed properties are located. Residential properties are typically listed with local realtors, after any redemption period has expired. We rely on these local real estate agents and/or brokers to list the properties on the local multiple listing system, to provide marketing materials and advertisements for the properties and to conduct open houses.        

OREO decreased $2 million, or 13.1%, to $12 million as of June 30, 2015, from $14 million as of December 31, 2014. During the six months ended June 30, 2015, we recorded OREO additions of $4 million and sold OREO with a book value of $6 million at a net gain of $1.7 million. As of June 30, 2015, the composition of OREO properties was 34% land and land development, 29% commercial, 31% residential real estate, 3% construction and 3% agricultural.

Allowance for Loan Losses. The Company performs a quarterly assessment of the adequacy of its allowance for loan losses in accordance with generally accepted accounting principles. The methodology used to assess the adequacy is consistently applied to the Company's loan portfolio. The allowance for loan losses is established through a provision for loan losses based on our evaluation of known and inherent risk in our loan portfolio at each balance sheet date. In determining the allowance for loan losses, we estimate losses on specific loans, or groups of loans, where the probable loss can be identified and reasonably determined. The balance of the allowance for loan losses is based on internally assigned risk classifications of loans, historical loan loss rates, changes in the nature of the loan portfolio, overall portfolio quality, industry concentrations, delinquency trends, current economic factors and the estimated impact of current economic conditions on certain historical loan loss rates. See the discussion under “Critical Accounting Estimates and Significant Accounting Policies — Allowance for Loan Losses."

The allowance for loan losses is increased by provisions charged against earnings and net recoveries of charged-off loans and is reduced by negative provisions credited to earnings and net loan charge-offs. The allowance for loan losses consists of three elements:

(1) Specific valuation allowances associated with impaired loans. Specific valuation allowances are determined based on assessment of the fair value of the collateral underlying the loans as determined through independent appraisals, the present value of future cash flows, observable market prices and any relevant qualitative or environmental factors impacting the loan. No specific valuation allowances are recorded for impaired loans that are adequately secured.

(2) Historical valuation allowances based on loan loss experience for similar loans with similar characteristics and trends. Historical valuation allowances are determined by applying percentage loss factors to the credit exposures from outstanding loans. For commercial, agricultural and real estate loans, loss factors are applied based on the internal risk classifications of these loans. For consumer loans, loss factors are applied on a portfolio basis. For commercial, agriculture and real estate loans, loss factor percentages are based on a migration analysis of our historical loss experience, designed to account for credit deterioration. For consumer loans, loss factor percentages are based on a one-year loss history.

(3) General valuation allowances determined based on changes in the nature of the loan portfolio, overall portfolio quality, industry concentrations, delinquency trends, general economic conditions and other qualitative risk factors both internal and external to us.

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Based on the assessment of the adequacy of the allowance for loan losses, management records provisions for loan losses to maintain the allowance for loan losses at appropriate levels.

Loans acquired in business combinations are recorded at fair value with no allowance for loan losses on the date of acquisition. Subsequent to the acquisition date, an allowance for loan loss is recorded for the emergence of new probable and estimable losses on loans acquired without evidence of credit impairment. Loans acquired with evidence of credit impairment are regularly monitored and to the extent that the performance has deteriorated from management's expectations at the date of acquisition, an allowance for loan losses is established. As of June 30, 2015, management determined that an allowance for loan losses related to acquired loans of $501 thousand was required under generally accepted accounting principles.

Loans, or portions thereof, are charged-off against the allowance for loan losses when management believes that the collectability of the principal is unlikely, or, with respect to consumer installment loans, according to an established delinquency schedule. Generally, loans are charged-off when (1) there has been no material principal reduction within the previous 90 days and there is no pending sale of collateral or other assets, (2) there is no significant or pending event which will result in principal reduction within the upcoming 90 days, (3) it is clear that we will not be able to collect all or a portion of the loan, (4) payments on the loan are sporadic, will result in an excessive amortization or are not consistent with the collateral held and (5) foreclosure or repossession actions are pending. Loan charge-offs do not directly correspond with the receipt of independent appraisals or the use of observable market data if the collateral value is determined to be sufficient to repay the principal balance of the loan.

If the impaired loan is adequately collateralized, a specific valuation allowance is not recorded. As such, significant changes in impaired and non-performing loans do not necessarily correspond proportionally with changes in the specific valuation component of the allowance for loan losses. Additionally, management expects the timing of charge-offs will vary between quarters and will not necessarily correspond proportionally to changes in the allowance for loan losses or changes in non-performing or impaired loans due to timing differences among the initial identification of an impaired loan, recording of a specific valuation allowance for the impaired loan and any resulting charge-off of uncollectible principal.

47

The following table sets forth information regarding our allowance for loan losses as of and for the periods indicated.

Allowance for Loan Losses
(Dollars in thousands)	Three Months Ended
	June 30,			March 31,			December 31,			September 30,			June 30,
	2015			2015			2014			2014			2014
Balance at beginning of period	$	75,336		$	74,200		$	74,231		$	78,266		$	81,371
Provision charged to operating expense	1,340			1,095			118			261			(2,001		)
Charge offs:
Real estate
Commercial	47			109			485			41			699
Construction	—			30			108			20			48
Residential	510			45			30			84			409
Agricultural	53			2			1			2			2
Consumer	837			1,301			1,658			1,437			934
Commercial	61			374			22			4,678			534
Agricultural	—			—			—			—			—
Other	—			—			—			12			—
Total charge-offs	1,508			1,861			2,304			6,274			2,626
Recoveries:
Real estate
Commercial	293			512			446			181			167
Construction	49			316			736			728			458
Residential	80			154			124			88			26
Agricultural	3			10			—			2			—
Consumer	520			640			686			495			558
Commercial	438			270			162			484			313
Agricultural	1			—			1			—			—
Total recoveries	1,384			1,902			2,155			1,978			1,522
Net charge-offs	124			(41		)	149			4,296			1,104
Balance at end of period	$	76,552		$	75,336		$	74,200		$	74,231		$	78,266
Period end loans	$	5,103,946		$	4,927,306		$	4,897,443		$	4,854,382		$	4,506,362
Average loans	4,991,416			4,895,146			4,870,509			4,751,928			4,436,786
Net loans charged-off to average loans, annualized	0.01		%	—		%	0.01		%	0.36		%	0.10		%
Allowance to period end loans	1.50		%	1.53		%	1.52		%	1.53		%	1.74		%

Our allowance for loan losses as a percentage of period end loans declined slightly to 1.50% as of June 30, 2015, as compared to 1.52% as of December 31, 2014, primarily due to loan growth. The decrease in our allowance for loan losses as a percentage of period end loans to 1.53% as of September 30, 2014, from 1.74% as of June 30, 2014,was due to the acquisition of Mountain West loans, which were initially recorded at fair value with no carryover of the related allowance for loan losses.

Although we have established our allowance for loan losses in accordance with accounting principles generally accepted in the United States and we believe that our allowance for loan losses is adequate to provide for known and inherent losses in the portfolio at all times, future provisions will be subject to on-going evaluations of the risks in the loan portfolio. If the economy declines or asset quality deteriorates, material additional provisions could be required.

Investment Securities. We manage our investment portfolio to obtain the highest yield possible, while meeting our risk tolerance and liquidity guidelines and satisfying the pledging requirements for deposits of state and political subdivisions and securities sold under repurchase agreements. Investment securities decreased $148 million, or 6.5%, to $2,139 million, or 25.5% of total assets, as of June 30, 2015, from $2,287 million, or 26.6% of total assets, as of December 31, 2014. During the first six months of 2015, proceeds from maturities, calls and pay-downs of investment securities were used to fund loan growth.

We evaluate our investment portfolio quarterly for other-than-temporary declines in the market value of individual investment securities. This evaluation includes monitoring credit ratings; market, industry and corporate news; volatility in market prices; and, determining whether the market value of a security has been below its cost for an extended period of time. As of June 30, 2015, we had investment securities with fair values aggregating $387 million that had been in a continuous loss position more than twelve months. Gross unrealized losses on these securities of $5 million as of June 30, 2015, were attributable to changes in interest rates. No impairment losses were recorded during the three and six months ended June 30, 2015 and 2014.

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Cash and Cash Equivalents. Cash and cash equivalents decreased $292 million, or 36.6%, to $506 million as of June 30, 2015, from $799 million as of December 31, 2014. During the first six months of 2015, loan growth was funded through available funds resulting in decreases in cash and cash equivalents from December 31, 2014 to June 30, 2015. Remaining decreases in cash and cash equivalents occurred during the normal course of business and are not reflective of changes in business plan or strategy.

Goodwill. Goodwill decreased $1 million to $204 million as of June 30, 2015, from $205 million as of December 31, 2014. During first quarter 2015, we completed our review of Mountain West tax items and finalized the fair valuation of acquired deferred tax assets, which resulted in a decrease in recorded goodwill.

Company-Owned Life Insurance. Company-owned life insurance increased $24 million, or 15.5%, to $178 million as of June 30, 2015, from $154 million as of December 31, 2014. During second quarter 2015, we purchased an additional $23 million of life insurance covering selected officers of FIB.

Deferred Tax Asset/Liability. As of June 30, 2015, we had a net deferred tax liability of $3 million, as compared to a net deferred tax asset of $5 million as of December 31, 2014. The shift in deferred taxes from a net asset to a net liability was primarily due to decreases in deferred tax assets related to unrealized losses on available-for sale investment securities and the removal of deferred tax assets upon the disposal of real property acquired as part of the Mountain West acquisition. The shift in the deferred taxes from a net asset to a net liability was also impacted by increases in deferred tax liabilities related to tax deductible goodwill from previous acquisitions.

Deposits. Our deposits consist of non-interest bearing and interest bearing demand, savings, individual retirement and time deposit accounts. Total deposits decreased $202 million, or 2.9%, to $6,804 million as of June 30, 2015, from $7,006 million as of December 31, 2014. Historically, we have experienced a decrease in total deposits during the first six months of each year. Our mix of deposits continued to shift away from higher-costing time deposits to lower-costing savings and non-interest bearing demand deposits. The following table summarizes our deposits as of the dates indicated:

Deposits
(Dollars in thousands)	June 30, 2015		Percent of Total		December 31, 2014		Percent of Total
Non-interest bearing demand	$	1,757,641	25.8	%	$	1,791,364	25.5	%
Interest bearing:
Demand	2,028,648		29.8		2,133,273		30.5
Savings	1,868,877		27.5		1,843,355		26.3
Time, $100 and over	490,088		7.2		520,125		7.4
Time, other (1)	659,147		9.7		718,095		10.2
Total interest bearing	5,046,760		74.2		5,214,848		74.5
Total deposits	$	6,804,401	100.0	%	$	7,006,212	100.0	%

(1) Included in Time, other are Certificate of Deposit Account Registry Service, or CDAR, deposits of $35 million as of June 30, 2015 and $40 million as of December 31, 2014.

Securities Sold Under Repurchase Agreements. In addition to deposits, repurchase agreements with commercial depositors, which include municipalities, provide an additional source of funds. Under repurchase agreements, deposit balances are invested in short-term U.S. government agency securities overnight and are then repurchased the following day. All outstanding repurchase agreements are due in one day. Repurchase agreement balances decreased $33 million, or 6.6%, to $469 million as of June 30, 2015, from $502 million as of December 31, 2014, due to fluctuations in the liquidity of our customers.

Long-Term Debt. Long-term debt increased $5 million, or 13.1%, to $43 million as of June 30, 2015, from $38 million as of December 31, 2014. On January 29, 2015, the Company borrowed $5 million on a 2.28% note payable maturing July 29, 2022, with interest payable monthly and principal due at maturity. The note is collateralized by the Company's equity interest in Universal Sub CDE, LLC, a community development entity owned 99.9% by the Company.

Capital Resources and Liquidity Management

Stockholders’ equity is influenced primarily by earnings, dividends, changes in the unrealized holding gains or losses, net of taxes, on available-for-sale investment securities and sales and redemptions of common stock. Stockholders’ equity increased $16 million, or 1.8%, to $925 million as of June 30, 2015, from $909 million as of December 31, 2014, primarily due to the retention of earnings, which was partially offset by the redemption and retirement of Class A common shares.

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During the three months ended March 31, 2015, we repurchased and retired 565,875 shares of our Class A common stock in open market transactions at an aggregate purchase price of $15 million. The repurchases were made pursuant to a stock repurchase program approved by our Board of Directors. No repurchases of shares of our Class A common stock were made during the three months ended June 30, 2015. For additional information regarding the repurchase, see “Note 8 – Capital Stock” in the accompanying “Notes to Unaudited Consolidated Financial Statements” included in this report.

On July 2, 2013, the Board of Governors of the Federal Reserve Bank issued a final rule implementing a revised regulatory capital framework for U.S. banks in accordance with the Basel III international accord and satisfying related mandates under the Dodd-Frank Wall Street Reform and Consumer Protection Act . The revised regulatory capital framework ("Basel III ") includes a more stringent definition of capital and introduces a new common equity tier 1, or CET1, capital requirement; sets forth a comprehensive methodology for calculating risk-weighted assets, introduces a conservation buffer and sets out minimum capital ratios and overall capital adequacy standards. As a banking organization subject to the standardized approach, Basel III became effective for us on January 1, 2015. Certain deductions and adjustments to regulatory capital began to phase in starting January 1, 2015 and will be fully implemented on January 1, 2018. The capital conservation buffer phases in beginning January 1, 2016 and will be fully implemented on January 1, 2019.

As of June 30, 2015 and December 31, 2014, we had capital levels that, in all cases, exceeded the well-capitalized guidelines. For additional information regarding our capital levels, see “Note 10 – Regulatory Capital” in the accompanying “Notes to Unaudited Consolidated Financial Statements” included in this report.

Liquidity. Liquidity measures our ability to meet current and future cash flow needs on a timely basis and at a reasonable cost. We manage our liquidity position to meet the daily cash flow needs of customers, while maintaining an appropriate balance between assets and liabilities to meet the return on investment objectives of our shareholders. Our liquidity position is supported by management of liquid assets and liabilities and access to alternative sources of funds. Liquid assets include cash, interest bearing deposits in banks, federal funds sold, available-for-sale investment securities and maturing or prepaying balances in our held-to-maturity investment and loan portfolios. Liquid liabilities include core deposits, federal funds purchased, securities sold under repurchase agreements and borrowings. Other sources of liquidity include the sale of loans, the ability to acquire additional national market funds through non-core deposits, the issuance of additional collateralized borrowings such as FHLB advances, the issuance of debt securities, additional borrowings through the Federal Reserve’s discount window and the issuance of preferred or common securities.

Our short-term and long-term liquidity requirements are primarily to fund on-going operations, including payment of interest on deposits and debt, extensions of credit to borrowers, capital expenditures and shareholder dividends. These liquidity requirements are met primarily through cash flow from operations, redeployment of prepaying and maturing balances in our loan and investment portfolios, debt financing and increases in customer deposits. For additional information regarding our operating, investing and financing cash flows, see the unaudited “Consolidated Statements of Cash Flows,” included in Part I, Item 1.

As a holding company, we are a corporation separate and apart from the Bank and, therefore, we provide for our own liquidity. Our main sources of funding include management fees and dividends declared and paid by the Bank and access to capital markets. There are statutory, regulatory and debt covenant limitations that affect the ability of our subsidiary bank to pay dividends to us. Management believes that such limitations will not impact our ability to meet our ongoing short-term cash obligations.

Management continuously monitors our liquidity position and adjustments are made to the balance between sources and uses of funds as deemed appropriate. Our management is not aware of any events that are reasonably likely to have a material adverse effect on our liquidity, capital resources or operations. In addition, our management is not aware of any regulatory recommendations regarding liquidity, which if implemented, would have a material adverse effect on us.

Recent Accounting Pronouncements

See “Note 16 – Recent Authoritative Accounting Guidance” in the accompanying “Notes to Unaudited Consolidated Financial Statements” included in this report for details of recently issued accounting pronouncements and their expected impact on our financial statements.    

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Item 3.

QUANTITATIVE AND QUALITATIVE DISCLOSURES

ABOUT MARKET RISK

As of June 30, 2015, there have been no material changes in the quantitative and qualitative information about market risk provided pursuant to Item 305 of Regulation S-K as presented in our Annual Report on Form 10-K for the year ended December 31, 2014.

Item 4.

CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

Our management is responsible for establishing and maintaining effective disclosure controls and procedures, as defined under Rules 13a-15(e) and 15d-15(e) of the Exchange Act. As of June 30, 2015, an evaluation was performed, under the supervision and with the participation of management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of June 30, 2015, were effective in ensuring that information required to be disclosed in our reports filed or submitted under the Exchange Act is recorded, processed, summarized, and reported within the time periods required by the SEC’s rules and forms, and is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting for the quarter ended June 30, 2015, that have materially affected, or are reasonably likely to materially affect, such control.

Limitations on Controls and Procedures

The effectiveness of our disclosure controls and procedures and our internal control over financial reporting is subject to various inherent limitations, including cost limitations, judgments used in decision making, assumptions about the likelihood of future events, the soundness of our systems, the possibility of human error, and the risk of fraud. Moreover, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions and the risk that the degree of compliance with policies or procedures may deteriorate over time. Because of these limitations, any system of disclosure controls and procedures or internal control over financial reporting may not be successful in preventing all errors or fraud or in making all material information known in a timely manner to the appropriate levels of management.    

PART II.

OTHER INFORMATION

Item 1. Legal Proceedings

There have been no material changes in legal proceedings as described in our Annual Report on Form 10-K for the year ended December 31, 2014.

Item 1A. Risk Factors

There have been no material changes in risk factors described in our Annual Report on Form 10-K for the year ended December 31, 2014.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(a) There were no unregistered sales of equity securities during the three months ended June 30, 2015.

(b) Not applicable.

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(c) There were no purchases made by or on behalf of us or any "affiliated purchasers" (as defined in Rule 10b-18(a)(3) under the Exchange Act), of our common stock during the three months ended June 30, 2015.

				Total Number of	Maximum Number
				Shares Purchased	of Shares That
	Total Number	Average		as Part of Publicly	May Yet Be
	of Shares	Price Paid		Announced Plans	Purchased Under the
Period	Purchased	Per Share		or Programs	Plans or Programs
April 2015	—	$	—	—	434,125
May 2015	—	—		—	434,125
June 2015	—	—		—	434,125
Total	—	$	—	—	434,125

Item 3. Defaults upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

Not applicable or required.

Item 6.    Exhibits

Exhibit Number	Description
2.2	Agreement and Plan of Merger between First Interstate BancSystem, Inc. and Mountain West Financial Corp dated February 10, 2014 (incorporated herein reference to Exhibit 2.1 of the Company's Pre-Effective Amendment No. 1 to Registration Statement on Form S-4, No. 333-194050, dated April 2, 2014)
3.1	Amended and Restated Articles of Incorporation dated March 5, 2010 (incorporated herein by reference to Exhibit 3.1 of the Company’s Current Report on Form 8-K/A filed on March 10, 2010)
3.2	Second Amended and Restated Bylaws dated January 27, 2011 (incorporated herein by reference to Exhibit 3.8 of the Company’s Current Report on Form 8-K filed on February 3, 2011)
10.1	Credit Agreement Re: Subordinated Term Note dated as of January 10, 2008, between First Interstate BancSystem, Inc. and First Midwest Bank (incorporated herein by reference to Exhibit 10.24 of the Company’s Current Report on Form 8-K filed on January 16, 2008)
10.2	Lease Agreement between Billings 401 Joint Venture and First Interstate Bank Montana dated September 20, 1985 and addendum thereto (incorporated herein by reference to Exhibit 10.4 of the Company’s Post-Effective Amendment No. 3 to Registration Statement on Form S-1, No. 033-84540, filed on September 29, 1994)
10.3†	First Interstate BancSystem’s Deferred Compensation Plan dated December 1, 2006 (incorporated herein by reference to Exhibit 10.9 of the Company’s Pre-Effective Amendment No. 3 to Registration Statement on Form S-1, No. 333-164380, filed on March 23, 2010)
10.4†	First Amendment to the First Interstate BancSystem’s Deferred Compensation Plan dated October 24, 2008 (incorporated herein by reference to Exhibit 10.10 of the Company’s Pre-Effective Amendment No. 3 to Registration Statement on Form S-1, No. 333-164380, filed on March 23, 2010)
10.5†	2001 Stock Option Plan, as amended (incorporated herein by reference to Exhibit 4.12 of the Company’s Registration Statement on Form S-8, No. 333-106495, filed on June 25, 2003)
10.6†	Second Amendment to 2001 Stock Option Plan (incorporated herein by reference to Exhibit 10.6 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010)

52

Exhibit Number	Description
10.7†	First Interstate BancSystem, Inc. 2006 Equity Compensation Plan, amended and restated as of November 21, 2013 (incorporated herein by reference to Exhibit 4.4 of the Company's Registration Statement on Form S-8, No. 333-193543, filed January 24, 2014 )
10.8†	Form of First Interstate BancSystem, Inc. 2006 Equity Compensation Plan Restricted Stock Agreement (Performance-ROA) for Certain Executive Officers (incorporated herein by reference to Exhibit 10.8 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2013)
10.9†	Form of First Interstate BancSystem, Inc. 2006 Equity Compensation Plan Restricted Stock Agreement (Performance-ROE) for Certain Executive Officers (incorporated herein by reference to Exhibit 10.9 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2013)
10.10†	Form of First Interstate BancSystem, Inc. 2006 Equity Compensation Plan Restricted Stock Agreement (Performance) for Certain Executive Officers (incorporated herein by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed on February 13, 2013)
10.11†	First Interstate BancSystem, Inc. 2015 Equity and Incentive Plan (incorporated herein by reference to Appendix A of the Company’s Proxy Statement on Schedule 14A for the 2015 Annual Meeting of Shareholders, filed on April 2, 2015).
10.12	Trademark License Agreements between Wells Fargo & Company and First Interstate BancSystem, Inc. (incorporated herein by reference to Exhibit 10.11 of the Registration Statement on Form S-1, filed on April 22, 1997)
31.1*	Certification of Quarterly Report on Form 10-Q pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 by Chief Executive Officer
31.2*	Certification of Quarterly Report on Form 10-Q pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 by Chief Financial Officer
32*	Certification of Quarterly Report on Form 10-Q pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101**	Interactive data file

† Management contract or compensatory arrangement.

* Filed herewith.

** As provided in Rule 406T of Regulation S-T, this information is furnished and not filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934.

53

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.

		FIRST INTERSTATE BANCSYSTEM, INC.
Date:	August 5, 2015	/S/    ED GARDING
		Ed Garding
		President and Chief Executive Officer
Date:	August 5, 2015	/S/    KEVIN P. RILEY
		Kevin P. Riley
		Executive Vice President and Chief Financial Officer

54

EX-31.1

Exhibit 31.1

CERTIFICATION OF QUARTERLY REPORT ON FORM 10-Q

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Ed Garding, certify that :

1. I have reviewed this quarterly report on Form 10-Q of First Interstate BancSystem, Inc;

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(s) 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(s) 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 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: August 5, 2015

/s/ ED GARDING

Ed Garding

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF QUARTERLY REPORT ON FORM 10-Q

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Kevin P. Riley, certify that :

1. I have reviewed this quarterly report on Form 10-Q of First Interstate BancSystem, Inc;

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(s) 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(s) 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 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: August 5, 2015

/s/ KEVIN P. RILEY

Kevin P. Riley

Executive Vice President and Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned are the Chief Executive Officer and the Chief Financial Officer of First Interstate BancSystem, Inc. (the “Registrant”). This Certification is made pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. This Certification accompanies the Quarterly Report on Form 10-Q of the Registrant for the quarter ended June 30, 2015.

We certify that such Quarterly Report on Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

This Certification is executed as of August 5, 2015.

/s/ ED GARDING

Ed Garding

President and Chief Executive Officer

/s/ KEVIN P. RILEY

Kevin P. Riley

Executive Vice President and Chief Financial Officer

XML

Schedule of Loans by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Loans and Leases Receivable [Line Items]
Loans held for investment	$ 5,028,624	$ 4,856,615
Mortgage loans held for sale	75,322	40,828
Total loans	5,103,946	4,897,443
Commercial real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	1,704,073	1,639,422
Land acquisition & development construction real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	211,889	220,443
Residential construction real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	101,023	96,580
Commercial construction real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	90,316	101,246
Total construction loans
Loans and Leases Receivable [Line Items]
Loans held for investment	403,228	418,269
Residential real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	999,038	999,903
Agricultural real estate
Loans and Leases Receivable [Line Items]
Loans held for investment	158,506	167,659
Total real estate loans
Loans and Leases Receivable [Line Items]
Loans held for investment	3,264,845	3,225,253
Indirect consumer
Loans and Leases Receivable [Line Items]
Loans held for investment	589,479	552,863
Other consumer
Loans and Leases Receivable [Line Items]
Loans held for investment	144,919	144,141
Credit card consumer
Loans and Leases Receivable [Line Items]
Loans held for investment	64,728	65,467
Total consumer loans
Loans and Leases Receivable [Line Items]
Loans held for investment	799,126	762,471
Total loans	799,126	762,471
Commercial
Loans and Leases Receivable [Line Items]
Loans held for investment	819,119	740,073
Total loans	819,119	740,073
Agricultural
Loans and Leases Receivable [Line Items]
Loans held for investment	142,629	124,859
Other, including overdrafts
Loans and Leases Receivable [Line Items]
Loans held for investment	$ 2,905	$ 3,959

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Financial Instruments with Off-Balance Sheet Risk (Details) $ in Thousands	Jun. 30, 2015 USD ($)
Entity Information [Line Items]
Credit Extension Commitments	$ 995,388
Credit Extension Commitments, Beyond One Year	357,999
Standby Letters of Credit
Entity Information [Line Items]
Credit Extension Commitments	58,105
Unused Credit Card Lines
Entity Information [Line Items]
Credit Extension Commitments	$ 528,943

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Long Term Debt (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Jan. 29, 2015
Debt Instrument, Maturity Date	Jul. 29, 2022
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 4,960
Debt Instrument, Interest Rate, Stated Percentage	2.28%
Members' Equity	99.90%

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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Supplemental Cash Flow Information [Abstract]
Transferred Loans to OREO	$ 4,396	$ 4,399
Transferred Loans to Mortgage Servicing Assets	1,792	$ 1,024
Transfer of Portfolio Loans and Leases to Held-for-sale	$ 10,619

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Schedule of Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment					$ 501	$ 287
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 75,336	$ 81,371	$ 74,200	$ 85,339
Provision charged to operating expense	1,340	(2,001)	2,435	(7,001)
Less loans charged-off	(1,508)	(2,626)	(3,368)	(5,417)
Add back recoveries of loans previously charged-off	1,384	1,522	3,285	5,345
Ending balance	76,552	78,266	76,552	78,266
Allowance for loan losses:
Loans individually evaluated for impairment					8,721	5,792
Loans collectively evaluated for impairment					67,831	68,408
Ending balance	75,336	81,371	74,200	85,339	76,552	74,200
Total loans:
Individually evaluated for impairment					100,493	78,480
Individually evaluated for impairment					5,003,453	4,818,963
Total loans					5,103,946	4,897,443
Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	53,659	59,830	53,884	63,923
Provision charged to operating expense	461	(2,011)	(570)	(5,386)
Less loans charged-off	(610)	(1,158)	(795)	(2,243)
Add back recoveries of loans previously charged-off	425	651	1,416	1,018
Ending balance	53,935	57,312	53,935	57,312
Allowance for loan losses:
Loans individually evaluated for impairment					4,824	3,961
Loans collectively evaluated for impairment					49,111	49,923
Ending balance	53,659	59,830	53,884	63,923	53,935	53,884
Total loans:
Individually evaluated for impairment					75,435	62,775
Individually evaluated for impairment					3,264,732	3,203,306
Total loans					3,340,167	3,266,081
Total consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,499	5,377	5,035	6,193
Provision charged to operating expense	646	346	1,771	(232)
Less loans charged-off	(837)	(934)	(2,138)	(1,780)
Add back recoveries of loans previously charged-off	520	558	1,160	1,166
Ending balance	5,828	5,347	5,828	5,347
Allowance for loan losses:
Loans individually evaluated for impairment					0	0
Loans collectively evaluated for impairment					5,828	5,035
Ending balance	5,499	5,377	5,035	6,193	5,828	5,035
Total loans:
Individually evaluated for impairment					0	0
Individually evaluated for impairment					799,126	762,471
Total loans					799,126	762,471
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	15,196	15,701	14,307	14,747
Provision charged to operating expense	224	(494)	1,217	(1,566)
Less loans charged-off	(61)	(534)	(435)	(1,330)
Add back recoveries of loans previously charged-off	438	313	708	3,135
Ending balance	15,797	14,986	15,797	14,986
Allowance for loan losses:
Loans individually evaluated for impairment					3,279	1,190
Loans collectively evaluated for impairment					12,518	13,117
Ending balance	15,196	15,701	14,307	14,747	15,797	14,307
Total loans:
Individually evaluated for impairment					23,573	14,526
Individually evaluated for impairment					795,546	725,547
Total loans					819,119	740,073
Agriculture
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	982	463	974	476
Provision charged to operating expense	9	158	17	183
Less loans charged-off	0	0	0	(64)
Add back recoveries of loans previously charged-off	1	0	1	26
Ending balance	992	621	992	621
Allowance for loan losses:
Loans individually evaluated for impairment					618	641
Loans collectively evaluated for impairment					374	333
Ending balance	982	463	974	476	992	974
Total loans:
Individually evaluated for impairment					1,485	1,179
Individually evaluated for impairment					141,144	123,680
Total loans					142,629	124,859
Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0	0	0
Provision charged to operating expense	0	0	0	0
Less loans charged-off	0	0	0	0
Add back recoveries of loans previously charged-off	0	0	0	0
Ending balance	0	0	0	0
Allowance for loan losses:
Loans individually evaluated for impairment					0	0
Loans collectively evaluated for impairment					0	0
Ending balance	$ 0	$ 0	$ 0	$ 0	0	0
Total loans:
Individually evaluated for impairment					0	0
Individually evaluated for impairment					2,905	3,959
Total loans					$ 2,905	$ 3,959

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis

Financial assets and financial liabilities measured at fair value on a recurring basis are as follows:

			Fair Value Measurements at Reporting Date Using
As of June 30, 2015	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale:
Obligations of U.S. government agencies	$	621,020	$	—	$	621,020	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	971,435			—	971,435			—
Private mortgage-backed securities	288			—	288			—

			Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale:
Obligations of U.S. government agencies	$	720,933	$	—	$	720,933	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	990,666			—	990,666			—
Private mortgage-backed securities	325			—	325			—

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Non-Recurring Basis

The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis.

				Fair Value Measurements at Reporting Date Using
As of June 30, 2015	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	50,131	$	—	$	—	$	50,131
Other real estate owned	5,623			—		—	5,623
Long-lived assets to be disposed of by sale	1,083			—		—	1,083
				Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	30,494	$	—	$	—	$	30,494
Other real estate owned	4,554			—		—	4,554
Long-lived assets to be disposed of by sale	1,083			—		—	1,083

Fair Value Inputs, Assets, Quantitative Information

As of June 30, 2015	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Impaired loans	$	50,131	Appraisal	Appraisal adjustment	0%	-	51%	(19%)
Other real estate owned	5,623		Appraisal	Appraisal adjustment	0%	-	50%	(15%)
Long-lived assets to be disposed of by sale	1,083		Appraisal	Appraisal adjustment	0%	-	9%	(5%)
As of December 31, 2014	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Impaired loans	$	30,494	Appraisal	Appraisal adjustment	0%	-	51%	(19%)
Other real estate owned	4,554		Appraisal	Appraisal adjustment	0%	-	50%	(15%)
Long-lived assets to be disposed of by sale	1,083		Appraisal	Appraisal adjustment	0%	-	9%	(5%)

Fair Value, by Balance Sheet Grouping

					Fair Value Measurements at Reporting Date Using
As of June 30, 2015	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	506,434	$	506,434	$	506,434	$	—	$	—
Investment securities available-for-sale	1,592,743		1,592,743		—		1,592,743		—
Investment securities held-to-maturity	546,690		553,323		—		553,323		—
Accrued interest receivable	29,008		29,008		—		29,008		—
Mortgage servicing rights, net	14,654		28,320		—		28,320		—
Net loans	5,027,394		5,000,935		—		4,950,804		50,131
Total financial assets	$	7,716,923	$	7,710,763	$	506,434	$	7,154,198	$	50,131
Financial liabilities:
Total deposits, excluding time deposits	$	5,655,166	$	5,655,166	$	5,655,166	$	—	$	—
Time deposits	1,149,235		1,153,809		—		1,153,809		—
Securities sold under repurchase agreements	469,145		469,145		—		469,145		—
Other borrowed funds	3		3		—		3		—
Accrued interest payable	5,366		5,366		—		5,366		—
Long-term debt	43,068		41,584		—		41,584		—
Subordinated debentures held by subsidiary    trusts	82,477		76,393		—		76,393		—
Total financial liabilities	$	7,404,460	$	7,401,466	$	5,655,166	$	1,746,300	$	—

					Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	798,670	$	798,670	$	798,670	$	—	$	—
Investment securities available-for-sale	1,711,924		1,711,924		—		1,711,924		—
Investment securities held-to-maturity	575,186		584,533		—		584,533		—
Accrued interest receivable	27,063		27,063		—		27,063		—
Mortgage servicing rights, net	14,038		21,434		—		21,434		—
Net loans	4,823,243		4,800,725		—		4,770,231		30,494
Total financial assets	$	7,950,124	$	7,944,349	$	798,670	$	7,115,185	$	30,494
Financial liabilities:
Total deposits, excluding time deposits	$	5,767,992	$	5,767,992	$	5,767,992	$	—	$	—
Time deposits	1,238,220		1,244,324		—		1,244,324		—
Securities sold under repurchase agreements	502,250		502,250		—		502,250		—
Other borrowed funds	9		9		—		9		—
Accrued interest payable	5,833		5,833		—		5,833		—
Long-term debt	38,067		37,781		—		37,781		—
Subordinated debentures held by subsidiary    trusts	82,477		75,734		—		75,734		—
Total financial liabilities	$	7,634,848	$	7,633,923	$	5,767,992	$	1,865,931	$	—

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Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Net accumulated other comprehensive income:
Net unrealized gain on investment securities available-for-sale	$ (749)	$ (2,121)
Net actuarial loss on defined benefit post-retirement benefit plans	(396)	(413)
Net accumulated other comprehensive income	$ (1,145)	$ (2,534)

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Subsequent Events

6 Months Ended

Jun. 30, 2015

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Subsequent events have been evaluated for potential recognition and disclosure through the date financial statements were filed with the Securities and Exchange Commission. On July 23, 2015, the Company declared a quarterly dividend to common shareholders of $0.20 per share, to be paid on August 14, 2015 to shareholders of record as of August 3, 2015.

On July 24, 2015, the Company completed the acquisition of Absarokee, parent company of United Bank, and the subsequent merger of United Bank with and into FIB. For additional information regarding the acquisition and subsequent bank merger, see "Note 2 - Acquisitions."

No other events requiring recognition or disclosure were identified.

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Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Income (Loss) Available to Common Stockholders, Basic
Net income	$ 22,222	$ 21,077	$ 43,202	$ 42,470
Weighted Average Number of Shares Outstanding, Basic and Diluted
Weighted average common shares outstanding for basic earnings per share computation	45,143,122	44,044,260	45,260,104	44,021,166
Dilutive effect of stock-based compensation	463,564	531,703	582,935	573,689
Weighted average common shares outstanding for diluted earnings per common share computation	45,606,686	44,575,963	45,843,039	44,594,855
Earnings Per Share, Basic and Diluted
Basic earnings per common share	$ 0.49	$ 0.48	$ 0.95	$ 0.96
Diluted earnings per common share	$ 0.49	$ 0.47	$ 0.94	$ 0.95
Stock Options
Earnings Per Share, Basic and Diluted [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			0	0
Unvested Restricted Stock
Earnings Per Share, Basic and Diluted [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			166,362	107,651

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Schedule of Recorded Investment in Past Due Loans by Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Mortgage loans held for sale	$ 75,322		$ 75,322		$ 40,828
Loans held for investment	5,028,624		5,028,624		4,856,615
Total loans	5,103,946		5,103,946		4,897,443
Interest Income on Non-Accrual Loans if Accrued	875	$ 1,061	1,613	$ 2,182
Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	8,037		8,037		6,632
Current Loans	1,669,445		1,669,445		1,605,421
Non-accrual Loans	26,591		26,591		27,369
Loans held for investment	1,704,073		1,704,073		1,639,422
Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,507		1,507		1,222
Current Loans	202,620		202,620		210,969
Non-accrual Loans	7,762		7,762		8,252
Loans held for investment	211,889		211,889		220,443
Residential construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	417		417		475
Current Loans	100,274		100,274		95,833
Non-accrual Loans	332		332		272
Loans held for investment	101,023		101,023		96,580
Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		100
Current Loans	86,874		86,874		98,582
Non-accrual Loans	3,442		3,442		2,564
Loans held for investment	90,316		90,316		101,246
Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,924		1,924		1,797
Current Loans	389,768		389,768		405,384
Non-accrual Loans	11,536		11,536		11,088
Loans held for investment	403,228		403,228		418,269
Residential real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	6,016		6,016		9,376
Current Loans	990,453		990,453		987,735
Non-accrual Loans	2,569		2,569		2,792
Loans held for investment	999,038		999,038		999,903
Agricultural real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,136		1,136		1,860
Current Loans	150,586		150,586		158,957
Non-accrual Loans	6,784		6,784		6,842
Loans held for investment	158,506		158,506		167,659
Total real estate loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	17,113		17,113		19,665
Current Loans	3,200,252		3,200,252		3,157,497
Non-accrual Loans	47,480		47,480		48,091
Loans held for investment	3,264,845		3,264,845		3,225,253
Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	3,915		3,915		3,723
Current Loans	585,200		585,200		548,757
Non-accrual Loans	364		364		383
Loans held for investment	589,479		589,479		552,863
Other consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	935		935		1,160
Current Loans	143,241		143,241		142,432
Non-accrual Loans	743		743		549
Loans held for investment	144,919		144,919		144,141
Credit card consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,030		1,030		968
Current Loans	63,684		63,684		64,484
Non-accrual Loans	14		14		15
Loans held for investment	64,728		64,728		65,467
Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	5,880		5,880		5,851
Current Loans	792,125		792,125		755,673
Non-accrual Loans	1,121		1,121		947
Loans held for investment	799,126		799,126		762,471
Total loans	799,126		799,126		762,471
Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	9,287		9,287		4,800
Current Loans	788,210		788,210		722,575
Non-accrual Loans	21,622		21,622		12,698
Loans held for investment	819,119		819,119		740,073
Total loans	819,119		819,119		740,073
Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	740		740		1,125
Current Loans	141,264		141,264		123,288
Non-accrual Loans	625		625		446
Loans held for investment	142,629		142,629		124,859
Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	311		311		0
Current Loans	2,594		2,594		3,959
Non-accrual Loans	0		0		0
Loans held for investment	2,905		2,905		3,959
Loans held for investment
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	33,331		33,331		31,441
Current Loans	4,924,445		4,924,445		4,762,992
Non-accrual Loans	70,848		70,848		62,182
Loans held for investment	5,028,624		5,028,624		4,856,615
Mortgage loans originated for sale
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		0
Current Loans	75,322		75,322		40,828
Non-accrual Loans	0		0		0
Total loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	33,331		33,331		31,441
Current Loans	4,999,767		4,999,767		4,803,820
Non-accrual Loans	70,848		70,848		62,182
Total loans	5,103,946		5,103,946		4,897,443
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	5,123		5,123		4,692
Financing Receivables, 30 to 59 Days Past Due [Member] | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,075		1,075		839
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	417		417		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		100
Financing Receivables, 30 to 59 Days Past Due [Member] | Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,492		1,492		939
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	3,563		3,563		6,969
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	875		875		1,624
Financing Receivables, 30 to 59 Days Past Due [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	11,053		11,053		14,224
Financing Receivables, 30 to 59 Days Past Due [Member] | Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	3,382		3,382		3,235
Financing Receivables, 30 to 59 Days Past Due [Member] | Other consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	785		785		988
Financing Receivables, 30 to 59 Days Past Due [Member] | Credit card consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	415		415		369
Financing Receivables, 30 to 59 Days Past Due [Member] | Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	4,582		4,582		4,592
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	8,285		8,285		3,659
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	700		700		1,125
Financing Receivables, 30 to 59 Days Past Due [Member] | Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans held for investment
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	24,620		24,620		23,600
Financing Receivables, 30 to 59 Days Past Due [Member] | Mortgage loans originated for sale
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		0
Financing Receivables, 30 to 59 Days Past Due [Member] | Total loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	24,620		24,620		23,600
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	2,803		2,803		1,609
Financing Receivables, 60 to 89 Days Past Due [Member] | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	276		276		383
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		475
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	276		276		858
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,524		1,524		645
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	261		261		236
Financing Receivables, 60 to 89 Days Past Due [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	4,864		4,864		3,348
Financing Receivables, 60 to 89 Days Past Due [Member] | Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	507		507		482
Financing Receivables, 60 to 89 Days Past Due [Member] | Other consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	121		121		140
Financing Receivables, 60 to 89 Days Past Due [Member] | Credit card consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	224		224		284
Financing Receivables, 60 to 89 Days Past Due [Member] | Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	852		852		906
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	812		812		994
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	30		30		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans held for investment
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	6,558		6,558		5,248
Financing Receivables, 60 to 89 Days Past Due [Member] | Mortgage loans originated for sale
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	6,558		6,558		5,248
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	111		111		331
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	156		156		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	156		156		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	929		929		1,762
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	1,196		1,196		2,093
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	26		26		6
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	29		29		32
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Credit card consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	391		391		315
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	446		446		353
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	190		190		147
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	10		10		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	311		311		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans held for investment
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	2,153		2,153		2,593
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Mortgage loans originated for sale
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	0		0		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Total loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total Loans 30 or More Days Past Due	$ 2,153		$ 2,153		$ 2,593

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Investment Securities Gross Unrealized Losses and Fair Values of Investment Securities (Details) $ in Thousands	Jun. 30, 2015 USD ($) securities	Dec. 31, 2014 USD ($) securities
Available-for-Sale:
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 360,915	$ 355,102
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(1,940)	(1,589)
Available-for-Sale, 12 Months or More Fair Value	373,131	460,753
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1	(4,829)	(7,407)
Available-for-Sale, Total Fair Value	734,046	815,855
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(6,769)	(8,996)
Held-to-Maturity:
Held-to-Maturity, Less than 12 Months Fair Value	136,004	83,935
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(3,657)	(1,846)
Held-to-Maturity, 12 Months or More Fair Value	13,513	20,097
Held-to-Maturity, 12 Months or More Gross Unrealized Losses	(359)	(373)
Held-to-Maturity, Total Fair Value	149,517	104,032
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1	$ (4,016)	$ (2,219)
Available-for-Sale and Held-to-Maturity:
Investment Securities in an Unrealized Loss Position (Number of Securities) | securities	190	154
Obligations of U.S. government agencies
Available-for-Sale:
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 106,516	$ 135,888
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(460)	(702)
Available-for-Sale, 12 Months or More Fair Value	239,339	309,283
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1	(1,844)	(4,668)
Available-for-Sale, Total Fair Value	345,855	445,171
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(2,304)	(5,370)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
Available-for-Sale:
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	254,399	219,214
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(1,480)	(887)
Available-for-Sale, 12 Months or More Fair Value	133,709	151,380
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1	(2,983)	(2,737)
Available-for-Sale, Total Fair Value	388,108	370,594
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(4,463)	(3,624)
Held-to-Maturity:
Held-to-Maturity, Less than 12 Months Fair Value	85,286	61,201
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(3,288)	(1,758)
Held-to-Maturity, 12 Months or More Fair Value	0	0
Held-to-Maturity, 12 Months or More Gross Unrealized Losses	0	0
Held-to-Maturity, Total Fair Value	85,286	61,201
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(3,288)	(1,758)
State, county and municipal securities
Held-to-Maturity:
Held-to-Maturity, Less than 12 Months Fair Value	19,427	7,979
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(165)	(13)
Held-to-Maturity, 12 Months or More Fair Value	13,513	20,097
Held-to-Maturity, 12 Months or More Gross Unrealized Losses	(359)	(373)
Held-to-Maturity, Total Fair Value	32,940	28,076
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(524)	(386)
Private mortgage-backed securities
Available-for-Sale:
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	0	0
Available-for-Sale, 12 Months or More Fair Value	83	90
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1	(2)	(2)
Available-for-Sale, Total Fair Value	83	90
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1	(2)	(2)
Corporate securities
Held-to-Maturity:
Held-to-Maturity, Less than 12 Months Fair Value	31,291	14,755
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1	(204)	(75)
Held-to-Maturity, 12 Months or More Fair Value	0	0
Held-to-Maturity, 12 Months or More Gross Unrealized Losses	0	0
Held-to-Maturity, Total Fair Value	31,291	14,755
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1	$ (204)	$ (75)

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Legal Proceedings (Details) - Pending Litigation - Kelly Logging Inc. v. First Interstate Bank - USD ($) $ in Thousands			1 Months Ended
	Apr. 21, 2015	Oct. 01, 2014	Aug. 31, 2014	Jun. 30, 2015
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value		$ 17,047	$ 17,047
Awarded Plaintiff Attorney's Fees	$ 7,500
Awarded Plaintiff Costs	91
Litigation Settlement, Amount	$ 24,638
Loss Contingency, Compensatory Damages Awarded, Value			287
Loss Contingency, Punitive Damages Awarded, Value			$ 16,760
Loss Contingency Accrual				$ 4,000

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Subsequent Events (Details) - Subsequent Event [Member] - $ / shares	Aug. 14, 2015	Aug. 03, 2015	Jul. 24, 2015	Jul. 23, 2015
Class A Common Stock
Subsequent Event [Line Items]
Dividends Payable, Date Declared				Jul. 23, 2015
Dividends Payable, Amount Per Share				$ 0.20
Dividends Payable, Date to be Paid	Aug. 14, 2015
Dividends Payable, Date of Record		Aug. 03, 2015
United Bank [Member]
Subsequent Event [Line Items]
Business Acquisition, Effective Date of Acquisition			Jul. 24, 2015

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OREO (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 65		$ 65
Real Estate Acquired Through Foreclosure [Roll Forward]
Beginning balance	15,134	$ 16,594	13,554	$ 15,504
Additions	1,139	984	4,396	4,399
Valuation adjustments	0	(10)	(106)	(10)
Dispositions	(4,500)	(1,143)	(6,071)	(3,468)
Ending balance	11,773	$ 16,425	11,773	$ 16,425
Residential real estate
Real Estate Acquired Through Foreclosure [Roll Forward]
Ending balance	$ 3,708		$ 3,708

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Basis of Presentation

6 Months Ended

Jun. 30, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

In the opinion of management, the accompanying unaudited consolidated financial statements of First Interstate BancSystem, Inc. and subsidiaries (the “Company”) contain all adjustments (all of which are of a normal recurring nature) necessary to present fairly the financial position of the Company at June 30, 2015 and December 31, 2014, and the results of operations for each of the three and six month periods ended and cash flows for each of the six month periods ended June 30, 2015 and 2014 in conformity with U.S. generally accepted accounting principles. The balance sheet information at December 31, 2014 is derived from audited consolidated financial statements. Certain reclassifications, none of which were material, have been made to conform prior year financial statements to the June 30, 2015 presentation. These reclassifications did not change previously reported net income or stockholders’ equity.

These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014. Operating results for the three and six months ended June 30, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015.

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Loans Schedule of Recorded Investment in Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	$ 133,299		$ 133,299		$ 87,240
Recorded Investment With No Allowance	58,800		58,800		57,050
Recorded Investment With Allowance	41,693		41,693		21,430
Total Recorded Investment	100,493		100,493		78,480
Related Allowance	8,721		8,721		5,792
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	86,438	$ 103,910	82,923	$ 107,961
Income Recognized	357	300	555	555
Interest Income on Impaired Loans If Interest Had Been Accrued	1,045	1,301	2,011	2,412
Commercial real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	60,786		60,786		41,603
Recorded Investment With No Allowance	31,201		31,201		28,143
Recorded Investment With Allowance	17,201		17,201		11,246
Total Recorded Investment	48,402		48,402		39,389
Related Allowance	1,810		1,810		1,608
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	39,513	57,588	40,652	60,870
Income Recognized	211	241	361	457
Land acquisition & development construction real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	22,630		22,630		12,511
Recorded Investment With No Allowance	6,452		6,452		7,262
Recorded Investment With Allowance	5,915		5,915		1,615
Total Recorded Investment	12,367		12,367		8,877
Related Allowance	569		569		574
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	8,664	13,563	8,720	14,554
Income Recognized	12	11	22	22
Residential construction real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	969		969		459
Recorded Investment With No Allowance	332		332		272
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	332		332		272
Related Allowance	0		0		0
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	338	785	302	1,051
Income Recognized	0	0	0	0
Commercial construction real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	3,796		3,796		2,729
Recorded Investment With No Allowance	426		426		253
Recorded Investment With Allowance	1,590		1,590		2,442
Total Recorded Investment	2,016		2,016		2,695
Related Allowance	1,606		1,606		904
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	3,492	1,471	3,133	918
Income Recognized	0	2	2	4
Total construction loans
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	27,395		27,395		15,699
Recorded Investment With No Allowance	7,210		7,210		7,787
Recorded Investment With Allowance	7,505		7,505		4,057
Total Recorded Investment	14,715		14,715		11,844
Related Allowance	2,175		2,175		1,478
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	12,494	15,819	12,155	16,523
Income Recognized	12	13	24	26
Residential real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	5,442		5,442		2,959
Recorded Investment With No Allowance	2,291		2,291		2,452
Recorded Investment With Allowance	1,429		1,429		341
Total Recorded Investment	3,720		3,720		2,793
Related Allowance	127		127		143
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	3,014	5,852	2,719	5,969
Income Recognized	1	1	2	3
Agricultural real estate
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	9,094		9,094		8,844
Recorded Investment With No Allowance	6,396		6,396		6,444
Recorded Investment With Allowance	2,202		2,202		2,305
Total Recorded Investment	8,598		8,598		8,749
Related Allowance	712		712		732
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	8,572	9,747	8,666	9,830
Income Recognized	13	25	35	29
Total real estate loans
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	102,717		102,717		69,105
Recorded Investment With No Allowance	47,098		47,098		44,826
Recorded Investment With Allowance	28,337		28,337		17,949
Total Recorded Investment	75,435		75,435		62,775
Related Allowance	4,824		4,824		3,961
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	63,593	89,006	64,192	93,192
Income Recognized	237	280	422	515
Commercial
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	28,472		28,472		16,904
Recorded Investment With No Allowance	11,275		11,275		11,882
Recorded Investment With Allowance	12,298		12,298		2,644
Total Recorded Investment	23,573		23,573		14,526
Related Allowance	3,279		3,279		1,190
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	21,841	14,162	17,874	14,231
Income Recognized	112	14	120	28
Agricultural
Impaired Financing Receivable, Unpaid Principal Balance
Unpaid Total Principal Balance	2,110		2,110		1,231
Recorded Investment With No Allowance	427		427		342
Recorded Investment With Allowance	1,058		1,058		837
Total Recorded Investment	1,485		1,485		1,179
Related Allowance	618		618		$ 641
Impaired Financing Receivable, Average Recorded Investment and Cash Basis Method Interest Income
Average Recorded Investment	1,004	742	857	538
Income Recognized	$ 8	$ 6	$ 13	$ 12

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OREO (Tables)

6 Months Ended

Jun. 30, 2015

Repossessed Assets [Abstract]

Other Real Estate Owned Roll Forward

Information with respect to the Company's other real estate owned follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Beginning balance	$	15,134		$	16,594		$	13,554		$	15,504
Additions	1,139			984			4,396			4,399
Valuation adjustments	—			(10		)	(106		)	(10		)
Dispositions	(4,500		)	(1,143		)	(6,071		)	(3,468		)
Ending balance	$	11,773		$	16,425		$	11,773		$	16,425

Foreclosed residential real estate properties of $3,708 were included in other real estate owned as of June 30, 2015. Consumer mortgage loans collateralized by residential real estate property of $65 were in the process of foreclosure as of June 30, 2015.

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Allowance for Loan Losses (Tables)

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Schedule of Allowance for Loan Losses by Portfolio Segment

The following tables present a summary of changes in the allowance for loan losses by portfolio segment for the periods indicated.

Three Months Ended June 30, 2015	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Beginning balance	$	53,659		$	5,499		$	15,196		$	982	$	—	$	75,336
Provision charged to operating expense	461			646			224			9		—		1,340
Less loans charged-off	(610		)	(837		)	(61		)	—		—		(1,508		)
Add back recoveries of loans previously    charged-off	425			520			438			1		—		1,384
Ending balance	$	53,935		$	5,828		$	15,797		$	992	$	—	$	76,552
Six Months Ended June 30, 2015	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Beginning balance	$	53,884		$	5,035		$	14,307		$	974	$	—	$	74,200
Provision charged to operating expense	(570		)	1,771			1,217			17		—		2,435
Less loans charged-off	(795		)	(2,138		)	(435		)	—		—		(3,368		)
Add back recoveries of loans previously    charged-off	1,416			1,160			708			1		—		3,285
Ending balance	$	53,935		$	5,828		$	15,797		$	992	$	—	$	76,552
As of June 30, 2015	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Loans individually evaluated for impairment	$	4,824		$	—		$	3,279		$	618	$	—	$	8,721
Loans collectively evaluated for impairment	49,111			5,828			12,518			374		—		67,831
Allowance for loan losses	$	53,935		$	5,828		$	15,797		$	992	$	—	$	76,552
Total loans:
Individually evaluated for impairment	$	75,435		$	—		$	23,573		$	1,485	$	—	$	100,493
Collectively evaluated for impairment	3,264,732			799,126			795,546			141,144		2,905		5,003,453
Total loans	$	3,340,167		$	799,126		$	819,119		$	142,629	$	2,905	$	5,103,946

Three Months Ended June 30, 2014	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Beginning balance	$	59,830		$	5,377		$	15,701		$	463	$	—	$	81,371
Provision charged to operating expense	(2,011		)	346			(494		)	158		—		(2,001		)
Less loans charged-off	(1,158		)	(934		)	(534		)	—		—		(2,626		)
Add back recoveries of loans previously    charged-off	651			558			313			—		—		1,522
Ending balance	$	57,312		$	5,347		$	14,986		$	621	$	—	$	78,266

Six Months Ended June 30, 2014	Real Estate			Consumer			Commercial			Agriculture			Other		Total
Allowance for loan losses:
Beginning balance	$	63,923		$	6,193		$	14,747		$	476		$	—	$	85,339
Provision charged to operating expense	(5,386		)	(232		)	(1,566		)	183			—		(7,001		)
Less loans charged-off	(2,243		)	(1,780		)	(1,330		)	(64		)	—		(5,417		)
Add back recoveries of loans previously    charged-off	1,018			1,166			3,135			26			—		5,345
Ending balance	$	57,312		$	5,347		$	14,986		$	621		$	—	$	78,266
As of December 31, 2014	Real Estate			Consumer			Commercial			Agriculture			Other		Total
Allowance for loan losses:
Loans individually evaluated for impairment	$	3,961		$	—		$	1,190		$	641		$	—	$	5,792
Loans collectively evaluated for impairment	49,923			5,035			13,117			333			—		68,408
Allowance for loan losses	$	53,884		$	5,035		$	14,307		$	974		$	—	$	74,200
Total loans:
Individually evaluated for impairment	$	62,775		$	—		$	14,526		$	1,179		$	—	$	78,480
Collectively evaluated for impairment	3,203,306			762,471			725,547			123,680			3,959		4,818,963
Total loans	$	3,266,081		$	762,471		$	740,073		$	124,859		$	3,959	$	4,897,443

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Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Change in net unrealized Gain during period:
Change in net unrealized gain during period, before tax amount	$ (9,196)	$ 2,816	$ 1,412	$ 17,167
Change in net unrealized gain during period, tax expense (benefit)	(3,618)	1,108	555	6,755
Change in net unrealized gain during period, net of tax amount	(5,578)	1,708	857	10,412
Reclassification adjustment for gains included in net income:
Reclassification adjustment for gains included in net income, before tax amount	(46)	(17)	(52)	(88)
Reclassification adjustment for gains included in net income, tax expense (benefit)	(18)	(7)	(20)	(35)
Reclassification adjustment for gains included in net income, net of tax amount	(28)	(10)	(32)	(53)
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity	451	0	902	0
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax	177	0	355	0
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity	274	0	547	0
Change in net actuarial loss:
Change in net actuarial loss, before tax amount	13	35	28	70
Change in net actuarial loss, tax expense (benefit)	5	14	11	28
Change in net actuarial loss, net of tax amount	8	21	17	42
Other comprehensive income (loss):
Other comprehensive income (loss), before tax	(8,778)	2,834	2,290	17,149
Total other comprehensive income, tax expense (benefit)	(3,454)	1,115	901	6,748
Total other comprehensive income, net of tax amount	$ (5,324)	$ 1,719	$ 1,389	$ 10,401

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Schedule of Loans Renegotiated in Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) notes	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) notes	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans Renegotiated in Troubled Debt Restructurings	$ 37,363		$ 37,363		$ 44,227
Loans Renegotiated in Troubled Debt Restructurings, Non-Accrual Loans	22,236		22,236		23,275
Loans Renegotiated in Troubled Debt Restructurings, Accrual Loans	$ 15,127		$ 15,127		$ 20,952
Number of Notes | notes	0		1
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 10
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0	0	$ 0
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0		0
Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			0
Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			10
Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			0
Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 0
Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | notes	0		1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0		$ 1,822
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | notes			1
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 10
Commercial | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			0
Commercial | Extension of terms or maturity
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			10
Commercial | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			0
Commercial | Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment			$ 0

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Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings per Share

The following table sets forth the computation of basic and diluted earnings per share for the three and six month periods ended June 30, 2015 and 2014.

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Net income	$	22,222	$	21,077	$	43,202	$	42,470
Weighted average common shares outstanding for basic earnings per share computation	45,143,122		44,044,260		45,260,104		44,021,166
Dilutive effects of stock-based compensation	463,564		531,703		582,935		573,689
Weighted average common shares outstanding for diluted earnings per common share computation	45,606,686		44,575,963		45,843,039		44,594,855
Basic earnings per common share	$	0.49	$	0.48	$	0.95	$	0.96
Diluted earnings per common share	$	0.49	$	0.47	$	0.94	$	0.95

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Regulatory Capital (Tables)

6 Months Ended

Jun. 30, 2015

Banking and Thrift [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations

Actual capital amounts and ratios for the Company and its bank subsidiary, as of June 30, 2015 and December 31, 2014 are presented in the following tables:

	Actual				Adequately Capitalized				Well Capitalized (1)
	Amount		Ratio		Amount		Ratio		Amount		Ratio
June 30, 2015
Total risk-based capital:
Consolidated	$	924,408	15.4	%	$	481,244	8.0	%	$	601,555	10.0	%
FIB	857,522		14.3		479,416		8.0		599,270		10.0
Tier 1 risk-based capital:
Consolidated	835,198		13.9		360,933		6.0		481,244		8.0
FIB	776,594		13.0		359,562		6.0		479,416		8.0
Common equity tier 1 risk-based capital:
Consolidated	755,198		12.6		270,700		4.5		391,011		6.5
FIB	776,594		13.0		269,671		4.5		389,525		6.5
Leverage capital ratio:
Consolidated	835,198		10.1		330,350		4.0		412,938		5.0
FIB	776,594		9.4		329,180		4.0		411,475		5.0

	Actual				Adequately Capitalized				Well Capitalized (1)
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2014
Total risk-based capital:
Consolidated	$	897,769	16.2	%	$	444,685	8.0	%	$	555,856	10.0	%
FIB	832,907		15.1		442,468		8.0		553,085		10.0
Tier 1 risk-based capital:
Consolidated	807,229		14.5		222,343		4.0		333,514		6.0
FIB	754,708		13.7		221,234		4.0		331,851		6.0
Leverage capital ratio:
Consolidated	807,229		9.6		335,897		4.0		419,871		5.0
FIB	754,708		9.2		330,006		4.0		412,507		5.0

(1) The ratios for the well-capitalized requirement are only applicable to FIB. However, the Company manages its capital position as if the requirement applies to the consolidated entity and has presented the ratios as if they also applied on a consolidated basis.

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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 43,202	$ 42,470
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,435	(7,001)
Net (gain) loss on disposal of property and equipment	(856)	(79)
Depreciation and amortization	9,090	7,786
Net premium amortization on investment securities	7,021	7,088
Net gains on investment securities transactions	(52)	(88)
Net gains on sales of mortgage loans held for sale	(10,759)	(7,601)
Net gain on sale of OREO	(1,736)	(766)
Write-downs of OREO and other assets pending disposal	106	10
Net reversal of impairment of mortgage servicing rights	(71)	(56)
Deferred income tax expense	9,108	3,760
Net increase in cash surrender value of company-owned life insurance policies	(1,304)	(1,724)
Stock-based compensation expense	2,319	2,154
Tax benefits from stock-based compensation expense	804	1,225
Excess tax benefits from stock-based compensation	(530)	(1,211)
Originations of loans held for sale	(561,779)	(412,050)
Proceeds from sales of loans held for sale	546,871	402,825
Changes in operating assets and liabilities:
Increase in interest receivable	(1,945)	(47)
Increase in other assets	(1,034)	(1,929)
Decrease in accrued interest payable	(467)	353
Decrease in accounts payable and accrued expenses	(12,268)	(4,788)
Net cash provided by operating activities	28,155	30,331
Cash flows from investing activities:
Purchases of held-to-maturity investment securities	(27,640)	(4,141)
Purchases of available-for-sale investment securities	(223,483)	(175,823)
Proceeds from maturities and paydowns of held-to-maturity investment securities	55,654	9,347
Proceeds from maturities and paydowns of available-for-sale investment securities	337,538	243,355
Purchases of company-owned life insurance	(22,500)	(15,000)
Proceeds from sales of mortgage servicing rights	0	266
Extensions of credit to customers, net of repayments	(190,392)	(155,523)
Recoveries of loans charged-off	3,285	5,345
Proceeds from sales of OREO	7,807	4,234
Capital expenditures, net of sales	514	(6,309)
Net cash used in investing activities	(59,217)	(94,249)
Cash flows from financing activities:
Net increase (decrease) in deposits	(201,811)	45,292
Net increase (decrease) in repurchase agreements	(33,105)	5,548
Net increase (decrease) in other borrowed funds	(6)	17
Repayments of long-term debt	(30)	(24)
Advances on long-term debt	5,031	0
Proceeds from issuance of common stock	1,670	3,547
Excess tax benefits from stock-based compensation	530	1,211
Purchase and retirement of common stock	(15,264)	(8,764)
Dividends paid to common stockholders	(18,189)	(14,088)
Net cash provided by (used in) financing activities	(261,174)	32,739
Net increase (decrease) in cash and cash equivalents	(292,236)	(31,179)
Cash and cash equivalents at beginning of period	798,670	534,827
Cash and cash equivalents at end of period	506,434	503,648
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	18,450	16,190
Cash paid during the period for interest expense	$ 9,364	$ 8,656

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Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Schedule of Comprehensive Income (Loss)

Other Comprehensive Income/Loss

The gross amounts of each component of other comprehensive income (loss) and the related tax effects are as follows:

	Pre-tax						Tax Expense (Benefit)						Net of Tax
Three Months Ended June 30,	2015			2014			2015			2014			2015			2014
Investment securities available-for sale:
Change in net unrealized gains/losses during period	$	(9,196	)	$	2,816		$	(3,618	)	$	1,108		$	(5,578	)	$	1,708
Reclassification adjustment for net gains  included in net income	(46		)	(17		)	(18		)	(7		)	(28		)	(10		)
Change in unamortized loss on available-  for-sale securities transferred into held-to-  maturity	451			—			177			—			274			—
Defined benefits post-retirement benefit plan:
Change in net actuarial loss	13			35			5			14			8			21
Total other comprehensive income (loss)	$	(8,778	)	$	2,834		$	(3,454	)	$	1,115		$	(5,324	)	$	1,719

	Pre-tax						Tax Expense (Benefit)						Net of Tax
Six Months Ended June 30,	2015			2014			2015			2014			2015			2014
Investment securities available-for sale:
Change in net unrealized gains/losses during period	$	1,412		$	17,167		$	555		$	6,755		$	857		$	10,412
Reclassification adjustment for net gains  included in net income	(52		)	(88		)	(20		)	(35		)	(32		)	(53		)
Change in unamortized loss on available-  for-sale securities transferred into held-to-  maturity	902			—			355			—			547			—
Defined benefits post-retirement benefit plan:
Change in net actuarial loss	28			70			11			28			17			42
Total other comprehensive income	$	2,290		$	17,149		$	901		$	6,748		$	1,389		$	10,401

Schedule of Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive loss, net of income tax benefits, are as follows:

	June 30, 2015			December 31, 2014
Net unrealized loss on investment securities available-for-sale	$	(749	)	$	(2,121	)
Net actuarial loss on defined benefit post-retirement benefit plans	(396		)	(413		)
Net accumulated other comprehensive loss	$	(1,145	)	$	(2,534	)

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Loans Schedule of Loans Acquired from Business Combinations (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]
Outstanding Balance	$ 35,555	$ 0
Carrying Amount Net, Accrual Status	22,293	0
Carrying Amount Net, Non Accrual Status	0	0
Total Carrying Value	$ 22,293	$ 0

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Commitments and Contingencies (Details) $ in Thousands	Jun. 30, 2015 USD ($)
Construction Contracts
Unrecorded Unconditional Purchase Obligation [Line Items]
Commitments to Purchase	$ 2,433

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Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 163,057	$ 147,894
Federal funds sold	2,763	543
Interest bearing deposits in banks	340,614	650,233
Total cash and cash equivalents	506,434	798,670
Investment securities:
Available-for-sale	1,592,743	1,711,924
Held-to-maturity (estimated fair values of $553,323 and $584,533 at June 30, 2015 and December 31, 2014, respectively)	546,690	575,186
Total investment securities	2,139,433	2,287,110
Loans held for investment	5,028,624	4,856,615
Mortgage loans held for sale	75,322	40,828
Total loans	5,103,946	4,897,443
Less allowance for loan losses	76,552	74,200
Net loans	5,027,394	4,823,243
Goodwill	204,375	205,574
Premises and equipment, net of accumulated depreciation	189,488	195,212
Company-owned life insurance	177,625	153,821
Other real estate owned (OREO)	11,773	13,554
Accrued interest receivable	29,008	27,063
Core deposit intangibles, net of accumulated amortization	11,573	13,282
Mortgage servicing rights, net of accumulated amortization and impairment reserve	14,654	14,038
Deferred tax asset, net	0	4,874
Other assets	74,461	73,495
Total assets	8,386,218	8,609,936
Deposits:
Non-interest bearing	1,757,641	1,791,364
Interest bearing	5,046,760	5,214,848
Total deposits	6,804,401	7,006,212
Securities sold under repurchase agreements	469,145	502,250
Accounts payable and accrued expenses	53,879	66,164
Accrued interest payable	5,366	5,833
Deferred tax liability	3,024	0
Long-term debt	43,068	38,067
Other borrowed funds	3	9
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total liabilities	7,461,363	7,701,012
Stockholders' equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued and outstanding as of June 30, 2015 or December 31, 2014	0	0
Common stock	313,125	323,596
Retained earnings	612,875	587,862
Accumulated other comprehensive income, net	(1,145)	(2,534)
Total stockholders' equity	924,855	908,924
Total liabilities and stockholders' equity	$ 8,386,218	$ 8,609,936

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Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	$ 5,028,624	$ 4,856,615
Commercial real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,704,073	1,639,422
Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	211,889	220,443
Residential construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	101,023	96,580
Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	90,316	101,246
Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	403,228	418,269
Residential real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	999,038	999,903
Agricultural real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	158,506	167,659
Total real estate loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	3,264,845	3,225,253
Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	589,479	552,863
Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	144,919	144,141
Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	64,728	65,467
Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	799,126	762,471
Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	819,119	740,073
Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	142,629	124,859
Other Assets Especially Mentioned
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	155,707	154,084
Other Assets Especially Mentioned | Commercial real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	83,194	84,533
Other Assets Especially Mentioned | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	13,426	11,826
Other Assets Especially Mentioned | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	857	2,029
Other Assets Especially Mentioned | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	0	39
Other Assets Especially Mentioned | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	14,283	13,894
Other Assets Especially Mentioned | Residential real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	8,434	10,473
Other Assets Especially Mentioned | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	9,826	10,122
Other Assets Especially Mentioned | Total real estate loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	115,737	119,022
Other Assets Especially Mentioned | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	843	916
Other Assets Especially Mentioned | Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	557	553
Other Assets Especially Mentioned | Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	0	0
Other Assets Especially Mentioned | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,400	1,469
Other Assets Especially Mentioned | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	34,776	25,766
Other Assets Especially Mentioned | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	3,794	7,827
Substandard
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	159,899	163,675
Substandard | Commercial real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	85,323	83,448
Substandard | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	14,190	15,016
Substandard | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	2,165	2,666
Substandard | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	409	253
Substandard | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	16,764	17,935
Substandard | Residential real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	9,387	10,848
Substandard | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	14,838	12,328
Substandard | Total real estate loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	126,312	124,559
Substandard | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,454	1,590
Substandard | Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	930	1,085
Substandard | Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	0	348
Substandard | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	2,384	3,023
Substandard | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	24,519	32,433
Substandard | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	6,684	3,660
Doubtful
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	31,701	34,854
Doubtful | Commercial real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	7,952	15,246
Doubtful | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	2,031	2,507
Doubtful | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	29	0
Doubtful | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	3,161	2,442
Doubtful | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	5,221	4,949
Doubtful | Residential real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,002	1,121
Doubtful | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	595	612
Doubtful | Total real estate loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	14,770	21,928
Doubtful | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	161	121
Doubtful | Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	349	432
Doubtful | Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	0	1,263
Doubtful | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	510	1,816
Doubtful | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	15,691	10,273
Doubtful | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	730	837
Total Criticized Loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	347,307	352,613
Total Criticized Loans | Commercial real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	176,469	183,227
Total Criticized Loans | Land acquisition & development construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	29,647	29,349
Total Criticized Loans | Residential construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	3,051	4,695
Total Criticized Loans | Commercial construction real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	3,570	2,734
Total Criticized Loans | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	36,268	36,778
Total Criticized Loans | Residential real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	18,823	22,442
Total Criticized Loans | Agricultural real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	25,259	23,062
Total Criticized Loans | Total real estate loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	256,819	265,509
Total Criticized Loans | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	2,458	2,627
Total Criticized Loans | Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	1,836	2,070
Total Criticized Loans | Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	0	1,611
Total Criticized Loans | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	4,294	6,308
Total Criticized Loans | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	74,986	68,472
Total Criticized Loans | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans held for investment	$ 11,208	$ 12,324

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Consolidated Statements of Changes in Stockholders Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Retained earnings	Accumulated other comprehensive income
Beginning Balance at Dec. 31, 2013	$ 801,581	$ 285,535	$ 532,087	$ (16,041)
Comprehensive income:
Net income	42,470	0	42,470	0
Other comprehensive income, net of tax	10,401	0	0	10,401
Common stock transactions:
Common shares purchased and retired 588,409 and 349,930 in 2015 and 2014, respectively	(8,764)	(8,764)	0	0
Stock Issued During Period, 21,414 and 24,581 in 2015 and 2014, respectively	0	0	0	0
Non-vested common shares issued 156,956 and 147,876 in 2015 and 2014 respectively	0	0	0	0
1,678 and 8,647 non-vested common shares forfeited in 2015 and 2014 respectively	0	0	0	0
129,885 and 286,069 stock options exercised, net of 37,357 and 160,377 shares tendered in payment of option price and income tax withholding amounts in 2015 and 2014 respectively	3,547	3,547	0	0
Tax benefit of stock-based compensation	1,225	1,225	0	0
Stock-based compensation expense	2,154	2,154	0	0
Cash dividends declared:
Common ($0.40 per share) in 2015 and ($0.32 per share) in 2014	(14,088)	0	(14,088)	0
Ending Balance at Jun. 30, 2014	838,526	283,697	560,469	(5,640)
Beginning Balance at Dec. 31, 2014	908,924	323,596	587,862	(2,534)
Comprehensive income:
Net income	43,202	0	43,202	0
Other comprehensive income, net of tax	1,389	0	0	1,389
Common stock transactions:
Common shares purchased and retired 588,409 and 349,930 in 2015 and 2014, respectively	(15,264)	(15,264)	0	0
Stock Issued During Period, 21,414 and 24,581 in 2015 and 2014, respectively	0	0	0	0
Non-vested common shares issued 156,956 and 147,876 in 2015 and 2014 respectively	0	0	0	0
1,678 and 8,647 non-vested common shares forfeited in 2015 and 2014 respectively	0	0	0	0
129,885 and 286,069 stock options exercised, net of 37,357 and 160,377 shares tendered in payment of option price and income tax withholding amounts in 2015 and 2014 respectively	1,670	1,670	0	0
Tax benefit of stock-based compensation	804	804	0	0
Stock-based compensation expense	2,319	2,319	0	0
Cash dividends declared:
Common ($0.40 per share) in 2015 and ($0.32 per share) in 2014	(18,189)	0	(18,189)	0
Ending Balance at Jun. 30, 2015	$ 924,855	$ 313,125	$ 612,875	$ (1,145)

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Fair Value Measurements Fair Value Inputs, Quantitative Information (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Loans and Leases Receivable, Impaired Loans | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(0.00%)	(0.00%)
Loans and Leases Receivable, Impaired Loans | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(51.00%)	(51.00%)
Loans and Leases Receivable, Impaired Loans | Weighted Average | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(19.00%)	(19.00%)
Real Estate Acquired in Satisfaction of Debt | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(0.00%)	(0.00%)
Real Estate Acquired in Satisfaction of Debt | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(50.00%)	(50.00%)
Real Estate Acquired in Satisfaction of Debt | Weighted Average | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(15.00%)	(15.00%)
Asses to be Disposed of by Sale | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(0.00%)	(0.00%)
Asses to be Disposed of by Sale | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(9.00%)	(9.00%)
Asses to be Disposed of by Sale | Weighted Average | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	(5.00%)	(5.00%)
Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 50,131	$ 30,494
Long-lived assets to be disposed of by sale	1,083	1,083
Other real estate owned	$ 5,623	$ 4,554

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Amortized Cost and Approximate Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Schedule of Available for Sale and Held-to-Maturity Securities [Line Items]
Available-for-Sale Securities, Gross Realized Gains	$ 46	$ 18	$ 52	$ 243
Available-for-sale Securities, Gross Realized Losses	0	$ 1	0	$ 155
Available-for-Sale:
Available-for-Sale, Amortized Cost	1,587,953		1,587,953		$ 1,708,494
Available-for-sale Securities, Gross Unrealized Gain1	11,559		11,559		12,426
Available-for-sale Securities, Gross Unrealized Loss1	(6,769)		(6,769)		(8,996)
Available-for-Sale, Estimated Fair Value	1,592,743		1,592,743		1,711,924
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	546,690		546,690		575,186
Held-to-maturity Securities, Gross Unrealized Gain1	10,649		10,649		11,566
Held-to-maturity Securities, Gross Unrealized Loss1	(4,016)		(4,016)		(2,219)
Held-to-Maturity, Estimated Fair Value	553,323		553,323		584,533
Obligations of U.S. government agencies
Available-for-Sale:
Available-for-Sale, Amortized Cost	622,237		622,237		725,408
Available-for-sale Securities, Gross Unrealized Gain1	1,087		1,087		895
Available-for-sale Securities, Gross Unrealized Loss1	(2,304)		(2,304)		(5,370)
Available-for-Sale, Estimated Fair Value	621,020		621,020		720,933
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
Available-for-Sale:
Available-for-Sale, Amortized Cost	965,430		965,430		982,764
Available-for-sale Securities, Gross Unrealized Gain1	10,468		10,468		11,526
Available-for-sale Securities, Gross Unrealized Loss1	(4,463)		(4,463)		(3,624)
Available-for-Sale, Estimated Fair Value	971,435		971,435		990,666
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	314,326		314,326		353,176
Held-to-maturity Securities, Gross Unrealized Gain1	5,945		5,945		5,563
Held-to-maturity Securities, Gross Unrealized Loss1	(3,288)		(3,288)		(1,758)
Held-to-Maturity, Estimated Fair Value	316,983		316,983		356,981
Private mortgage-backed securities
Available-for-Sale:
Available-for-Sale, Amortized Cost	286		286		322
Available-for-sale Securities, Gross Unrealized Gain1	4		4		5
Available-for-sale Securities, Gross Unrealized Loss1	(2)		(2)		(2)
Available-for-Sale, Estimated Fair Value	288		288		325
State, county and municipal securities
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	181,642		181,642		188,941
Held-to-maturity Securities, Gross Unrealized Gain1	4,644		4,644		5,949
Held-to-maturity Securities, Gross Unrealized Loss1	(524)		(524)		(386)
Held-to-Maturity, Estimated Fair Value	185,762		185,762		194,504
Corporate securities
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	50,310		50,310		32,565
Held-to-maturity Securities, Gross Unrealized Gain1	59		59		54
Held-to-maturity Securities, Gross Unrealized Loss1	(204)		(204)		(75)
Held-to-Maturity, Estimated Fair Value	50,165		50,165		32,544
Other Investments
Held-to-Maturity:
Held-to-Maturity, Amortized Cost	412		412		504
Held-to-maturity Securities, Gross Unrealized Gain1	1		1		0
Held-to-maturity Securities, Gross Unrealized Loss1	0		0		0
Held-to-Maturity, Estimated Fair Value	$ 413		$ 413		$ 504

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Other Comprehensive Income

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Other Comprehensive Income

Other Comprehensive Income/Loss

The gross amounts of each component of other comprehensive income (loss) and the related tax effects are as follows:

	Pre-tax						Tax Expense (Benefit)						Net of Tax
Three Months Ended June 30,	2015			2014			2015			2014			2015			2014
Investment securities available-for sale:
Change in net unrealized gains/losses during period	$	(9,196	)	$	2,816		$	(3,618	)	$	1,108		$	(5,578	)	$	1,708
Reclassification adjustment for net gains  included in net income	(46		)	(17		)	(18		)	(7		)	(28		)	(10		)
Change in unamortized loss on available-  for-sale securities transferred into held-to-  maturity	451			—			177			—			274			—
Defined benefits post-retirement benefit plan:
Change in net actuarial loss	13			35			5			14			8			21
Total other comprehensive income (loss)	$	(8,778	)	$	2,834		$	(3,454	)	$	1,115		$	(5,324	)	$	1,719

	Pre-tax						Tax Expense (Benefit)						Net of Tax
Six Months Ended June 30,	2015			2014			2015			2014			2015			2014
Investment securities available-for sale:
Change in net unrealized gains/losses during period	$	1,412		$	17,167		$	555		$	6,755		$	857		$	10,412
Reclassification adjustment for net gains  included in net income	(52		)	(88		)	(20		)	(35		)	(32		)	(53		)
Change in unamortized loss on available-  for-sale securities transferred into held-to-  maturity	902			—			355			—			547			—
Defined benefits post-retirement benefit plan:
Change in net actuarial loss	28			70			11			28			17			42
Total other comprehensive income	$	2,290		$	17,149		$	901		$	6,748		$	1,389		$	10,401

The components of accumulated other comprehensive loss, net of income tax benefits, are as follows:

	June 30, 2015			December 31, 2014
Net unrealized loss on investment securities available-for-sale	$	(749	)	$	(2,121	)
Net actuarial loss on defined benefit post-retirement benefit plans	(396		)	(413		)
Net accumulated other comprehensive loss	$	(1,145	)	$	(2,534	)

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Investment Securities Realized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 46	$ 18	$ 52	$ 243
Gross realized losses	$ 0	$ 1	$ 0	$ 155

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Recent Authoritative Accounting Guidance

6 Months Ended

Jun. 30, 2015

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Authoritative Accounting Guidance

Recent Authoritative Accounting Guidance

ASU 2014-04 “Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure.” The amendments inASU 2014-04 clarify that an in-substance repossession or foreclosures occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (i) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (ii) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. The amendments in ASU 2014-04 also require interim and annual disclosure of both (i) the amount of foreclosed residential real estate property held by the creditor and (ii) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure. The Company adopted the amendments in ASU 2014-04 effective January 1, 2015 using a prospective transition method. Adoption of the amendments in ASU 2014-04 did not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2014-09 "Revenue from Contracts with Customers." The amendments in ASU 2014-09 introduce a new five-step revenue recognition model in which an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires disclosures sufficient to enable users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, including qualitative and quantitative disclosures about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The amendments in ASU 2014-09 are effective for the Company for fiscal years beginning after December 15, 2016, including interim periods within that reporting period, and may be adopted retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initial adoption recognized at the date of initial application. The Company is currently evaluating the new guidance to determine the impact it will have on its consolidated financial statements, results of operations or liquidity.

ASU 2014-11 "Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures." The amendments in ASU 2014-11 expand secured borrowing treatment for certain repurchase agreements. Under the amendments in ASU 2014-11, repurchase-to-maturity transactions and repurchase agreements executed as repurchase financing transactions are required to be accounted for as secured borrowings. ASU 2014-11 requires additional disclosures about certain transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the same counterparty. ASU 2014-11 also requires disclosure of the types of collateral pledged and liabilities associated with an entity's repurchase agreements, securities lending transactions and repurchase-to-maturity transactions accounted for as secured borrowings. The Company adopted the amendments in ASU 2014-11 are effective January 1, 2015. The adoption did not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2014-12 "Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could be Achieved after the Requisite Service Period." ASU 2014-12 amends Accounting Standards Codification ("ASC") Topic 718, Compensation-Stock Compensation, to clarify that a performance target that affects the vesting of a share-based payment award and that could be achieved after the requisite service period should be treated as a performance condition that affects the vesting of the award. ASU 2014-12 further clarifies that the requisite service period ends when the employees can cease rendering service and still be eligible to vest in the award if the performance target is achieved. The amendments in ASU 2014-12 are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. The amendments in ASU 2014-12 may be applied prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The amendments in ASU 2014-12 will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2014-14 "Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure." ASU 2014-14 updates ASC Subtopic 310-40, Receivables-Troubled Debt Restructurings by Creditors, to require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if (i) the loan has a government guarantee that is not separable from the loan before foreclosure; (ii) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and, (iii) any amount of the claim that is determined on the basis of the fair value of the real estate is fixed at the time of foreclosure. ASU 2014-14 provides that, upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The Company adopted the amendments in ASU 2014-14 effective January 1, 2015, using a prospective transition method. Adoption of the amendments in ASU 2014-12 did not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2014-16 "Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share is More Akin to Debt or to Equity." The amendments in ASU 2014-16 clarify that an entity should consider all relevant terms and features-including the embedded derivative feature being evaluated for bifurcation-in evaluating the nature of the host contract within a hybrid financial instrument. The amendments further clarify that no single term or feature would necessarily determine the economic characteristics and risk of the host contract. Rather, the nature of the host contract depends upon the economic characteristics and risk of the entire hybrid financial instrument. The amendments in ASU 2014-16 are effective for the Company for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. The effects of initially adopting the amendments in ASU 2014-16 should be applied on a modified retrospective basis to existing hybrid financial instruments issued in the form of a share as of the beginning of the fiscal year for which the amendments are effective. Retrospective application is permitted to all relevant prior periods. The amendments in ASU 2014-16 will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2015-02 "Amendments to the Consolidation Analysis." The amendments in ASU 2015-02 (i) modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, (ii) eliminate the presumption that a general partner should consolidate a limited partnership, (iii) affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and (iv) provide scope exceptions from consolidation guidance for reporting entities with interest in legal entities that are required to comply or operate in accordance with requirements of the Investment Company Act of 1940 for registered market funds. The amendments in ASU 2015-02 are effective for public entities for fiscal years, and interim periods within those years, beginning after December 15, 2015, with early adoption permitted. The amendments in ASU 2015-02, which may be adopted using a retrospective or modified retrospective approach, will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2015-03 "Simplifying the Presentation of Debt Issuance Costs." The amendments in ASU 2015-03 require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, rather than as a deferred charge. The amendments in ASU 2015-03 are effective for public entities for fiscal years, and interim periods within those years, beginning after December 15, 2015, and should be applied on a retrospective basis. The amendments in ASU 2015-03 will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2015-05 "Intangibles-Goodwill and Other Internal-Use Software." The amendments in ASU 2015-05 (i) provide guidance about whether a cloud computing arrangement includes a software license. Under the guidance in ASU 2015-05, if a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The guidance in ASU 2015-05 does not change generally accepted accounting principles for a customer's accounting for service contracts. The amendments in ASU 2015-05 are effective for public entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2015, with early adoption permitted. The amendments in ASU 2015-05, which may be adopted retrospectively or prospectively to all arrangements entered into or materially modified after the effective date. Adoption of the amendments in ASU 2015-05 will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

ASU 2015-10 "Technical Corrections and Improvements." The amendments in ASU 2015-10 represent changes to clarify the codification, correct unintended application of guidance, or make minor improvements to the codification that are not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities. The amendments in ASU 2015-10 that require transition guidance are effective for all entities for fiscal years, and interim periods within those years, beginning after December 15, 2015, with early adoption permitted. All other amendments in ASU 2015-10 became effective in June 2015. The amendments in ASU 2015-03 will not have a material impact on the Company’s consolidated financial statements, results of operations or liquidity.

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Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Common stock
Common stock transactions:
Common shares purchased and retired	588,409	349,930
Common shares issued	21,414	24,581
Non-vested common shares issued	156,956	147,876
Non-vested common shares forfeited	1,678	8,647
Stock options exercised	129,885	286,069
Shares tendered in payment of option price and income tax withholding amounts	37,357	160,377
Retained earnings
Cash dividends declared:
Common (in dollars per share)	$ 0.40	$ 0.32

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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment securities:
Held-to-Maturity, Estimated Fair Value	$ 553,323	$ 584,533
Stockholders' equity:
Nonvoting noncumulative preferred stock, par value	$ 0	$ 0
Nonvoting noncumulative preferred stock, authorized shares	100,000	100,000
Nonvoting noncumulative preferred stock, issued shares	0	0
Nonvoting noncumulative preferred stock, outstanding shares	0	0

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Earnings per Common Share

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Earnings per Common Share

Earnings per Common Share

Basic earnings per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period presented, excluding unvested restricted stock. Diluted earnings per share is calculated by dividing net income by the weighted average number of common shares determined for the basic earnings per share computation plus the dilutive effects of stock-based compensation using the treasury stock method.

The following table sets forth the computation of basic and diluted earnings per share for the three and six month periods ended June 30, 2015 and 2014.

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Net income	$	22,222	$	21,077	$	43,202	$	42,470
Weighted average common shares outstanding for basic earnings per share computation	45,143,122		44,044,260		45,260,104		44,021,166
Dilutive effects of stock-based compensation	463,564		531,703		582,935		573,689
Weighted average common shares outstanding for diluted earnings per common share computation	45,606,686		44,575,963		45,843,039		44,594,855
Basic earnings per common share	$	0.49	$	0.48	$	0.95	$	0.96
Diluted earnings per common share	$	0.49	$	0.47	$	0.94	$	0.95

The Company had 166,362 and 107,651 shares of unvested restricted stock as of June 30, 2015 and 2014, respectively, that were not included in the computation of diluted earnings per common share because performance conditions for vesting had not been met. The Company had no anti-dilutive stock options outstanding as of June 30, 2015 or June 30, 2014.

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Document and Entity Information - Jun. 30, 2015 - shares	Total
Entity Registrant Name	FIRST INTERSTATE BANCSYSTEM INC
Entity Central Index Key	0000860413
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Amendment Flag	false
Class A Common Stock
Entity Common Stock, Shares Outstanding	21,720,287
Class B Common Stock
Entity Common Stock, Shares Outstanding	23,786,296

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Regulatory Capital

6 Months Ended

Jun. 30, 2015

Banking and Thrift [Abstract]

Regulatory Capital

Regulatory Capital

On July 2, 2013, the Board of Governors of the Federal Reserve Bank issued a final rule implementing a revised regulatory capital framework for U.S. banks in accordance with the Basel III international accord and satisfying related mandates under the Dodd-Frank Wall Street Reform and Consumer Protection Act . The revised regulatory capital framework ("Basel III ") includes a more stringent definition of capital and introduces a new common equity tier 1, or CET1, capital requirement, sets forth a comprehensive methodology for calculating risk-weighted assets, introduces a conservation buffer and sets out minimum capital ratios and overall capital adequacy standards. As a banking organization subject to the standardized approach, Basel III became effective for us on January 1, 2015. Certain deductions and adjustments to regulatory capital began to phase in starting January 1, 2015 and will be fully implemented on January 1, 2018. The capital conservation buffer phases in beginning January 1, 2016 and will be fully implemented on January 1, 2019.

CET1 capital predominantly includes common shareholders’ equity, less certain deductions for goodwill, intangible assets and deferred tax assets that arise from net operating losses and tax credit carry-forwards. We have elected to permanently exclude capital in accumulated other comprehensive income related to debt and equity securities classified as available-for-sale as well as for defined benefit post-retirement plans from CET1. Certain deductions and adjustments to CET1 capital, tier 1 capital and tier 2 capital are subject to phase-in through December 31, 2017.

As of June 30, 2015 and December 31, 2014, the Company exceeded all capital adequacy requirements to which it is subject. Actual capital amounts and ratios for the Company and its bank subsidiary, as of June 30, 2015 and December 31, 2014 are presented in the following tables:

	Actual				Adequately Capitalized				Well Capitalized (1)
	Amount		Ratio		Amount		Ratio		Amount		Ratio
June 30, 2015
Total risk-based capital:
Consolidated	$	924,408	15.4	%	$	481,244	8.0	%	$	601,555	10.0	%
FIB	857,522		14.3		479,416		8.0		599,270		10.0
Tier 1 risk-based capital:
Consolidated	835,198		13.9		360,933		6.0		481,244		8.0
FIB	776,594		13.0		359,562		6.0		479,416		8.0
Common equity tier 1 risk-based capital:
Consolidated	755,198		12.6		270,700		4.5		391,011		6.5
FIB	776,594		13.0		269,671		4.5		389,525		6.5
Leverage capital ratio:
Consolidated	835,198		10.1		330,350		4.0		412,938		5.0
FIB	776,594		9.4		329,180		4.0		411,475		5.0

	Actual				Adequately Capitalized				Well Capitalized (1)
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2014
Total risk-based capital:
Consolidated	$	897,769	16.2	%	$	444,685	8.0	%	$	555,856	10.0	%
FIB	832,907		15.1		442,468		8.0		553,085		10.0
Tier 1 risk-based capital:
Consolidated	807,229		14.5		222,343		4.0		333,514		6.0
FIB	754,708		13.7		221,234		4.0		331,851		6.0
Leverage capital ratio:
Consolidated	807,229		9.6		335,897		4.0		419,871		5.0
FIB	754,708		9.2		330,006		4.0		412,507		5.0

(1) The ratios for the well-capitalized requirement are only applicable to FIB. However, the Company manages its capital position as if the requirement applies to the consolidated entity and has presented the ratios as if they also applied on a consolidated basis.

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Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest income:
Interest and fees on loans	$ 60,402	$ 55,565	$ 119,773	$ 109,283
Interest and dividends on investment securities:
Taxable	8,000	7,309	15,971	14,949
Exempt from federal taxes	1,040	1,083	2,099	2,180
Interest on deposits in banks	271	225	660	456
Interest on federal funds sold	5	3	7	4
Total interest income	69,718	64,185	138,510	126,872
Interest expense:
Interest on deposits	3,239	3,327	6,548	6,751
Interest on securities sold under repurchase agreements	53	63	107	129
Interest on long-term debt	538	476	1,052	949
Interest on subordinated debentures held by subsidiary trusts	600	592	1,190	1,180
Total interest expense	4,430	4,458	8,897	9,009
Net interest income	65,288	59,727	129,613	117,863
Provision for loan losses	1,340	(2,001)	2,435	(7,001)
Net interest income after provision for loan losses	63,948	61,728	127,178	124,864
Non-interest income:
Other service charges, commissions and fees	11,173	9,699	21,040	18,855
Income from the origination and sale of loans	8,802	6,380	14,708	11,040
Investment Advisory, Management and Administrative Fees	4,897	4,609	9,834	9,064
Service charges on deposit accounts	4,053	3,929	7,997	7,804
Investment securities gains, net	46	17	52	88
Other income	2,799	1,937	5,921	3,826
Total non-interest income	31,770	26,571	59,552	50,677
Non-interest expense:
Salaries and wages	26,093	24,440	51,442	46,882
Employee benefits	8,070	7,164	15,850	15,477
Occupancy, net	4,529	4,253	9,021	8,492
Furniture and equipment	3,703	3,157	7,496	6,358
Outsourced technology services	2,593	2,309	5,056	4,609
OREO expense, net of income	(823)	(134)	(884)	(153)
Professional fees	1,514	1,278	2,815	2,648
FDIC insurance premiums	1,304	1,093	2,446	2,209
Mortgage servicing rights amortization	627	583	1,246	1,183
Mortgage servicing rights impairment recovery	(56)	(11)	(71)	(56)
Core deposit intangibles amortization	854	354	1,709	708
Other expenses	13,577	10,837	25,381	21,304
Non-core acquisition expenses	(7)	597	63	597
Total non-interest expense	61,978	55,920	121,570	110,258
Income before income tax expense	33,740	32,379	65,160	65,283
Income tax expense	11,518	11,302	21,958	22,813
Net income	$ 22,222	$ 21,077	$ 43,202	$ 42,470
Basic earnings per common share	$ 0.49	$ 0.48	$ 0.95	$ 0.96
Diluted earnings per common share	$ 0.49	$ 0.47	$ 0.94	$ 0.95

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Loans

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Loans

Loans

The following table presents loans by class as of the dates indicated:

	June 30, 2015		December 31, 2014
Real estate loans:
Commercial	$	1,704,073	$	1,639,422
Construction:
Land acquisition & development	211,889		220,443
Residential	101,023		96,580
Commercial	90,316		101,246
Total construction loans	403,228		418,269
Residential	999,038		999,903
Agricultural	158,506		167,659
Total real estate loans	3,264,845		3,225,253
Consumer:
Indirect consumer	589,479		552,863
Other consumer	144,919		144,141
Credit card	64,728		65,467
Total consumer loans	799,126		762,471
Commercial	819,119		740,073
Agricultural	142,629		124,859
Other, including overdrafts	2,905		3,959
Loans held for investment	5,028,624		4,856,615
Mortgage loans held for sale	75,322		40,828
Total loans	$	5,103,946	$	4,897,443

Loans from business combinations included in the table above include certain loans that had evidence of deterioration in credit quality since origination and for which it was probable, at acquisition, that all contractually required payments would not be collected.

The following table displays the outstanding unpaid principal balance, accrued interest receivable and accrual status of loans acquired with credit impairment as of June 30, 2015 and 2014:    

As of June 30,	2015		2014
Outstanding balance	$	35,555	$	—
Carrying value
Loans on accrual status	22,293		—
Loans on non-accrual status	—		—
Total carrying value	$	22,293	$	—

The following table summarizes changes in the accretable yield for loans acquired credit impaired for the three and six ended June 30, 2015 and 2014:

	Three Months Ended June 30,					Six Months Ended June 30,
	2015			2014		2015			2014
Beginning balance	$	6,980		$	—	$	5,781		$	—
Accretion income	(807		)	—		(1,355		)	—
Reductions due to exit events	—			—		(396		)	—
Reclassifications from (to) nonaccretable differences	1,309			—		3,452			—
Ending balance	$	7,482		$	—	$	7,482		$	—

Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. The following tables present the contractual aging of the Company’s recorded investment in past due loans by class as of the dates indicated:

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of June 30, 2015	Past Due		Past Due		Past Due		Past Due		Loans		Loans		Loans
Real estate
Commercial	$	5,123	$	2,803	$	111	$	8,037	$	1,669,445	$	26,591	$	1,704,073
Construction:
Land acquisition & development	1,075		276		156		1,507		202,620		7,762		211,889
Residential	417		—		—		417		100,274		332		101,023
Commercial	—		—		—		—		86,874		3,442		90,316
Total construction loans	1,492		276		156		1,924		389,768		11,536		403,228
Residential	3,563		1,524		929		6,016		990,453		2,569		999,038
Agricultural	875		261		—		1,136		150,586		6,784		158,506
Total real estate loans	11,053		4,864		1,196		17,113		3,200,252		47,480		3,264,845
Consumer:
Indirect consumer	3,382		507		26		3,915		585,200		364		589,479
Other consumer	785		121		29		935		143,241		743		144,919
Credit card	415		224		391		1,030		63,684		14		64,728
Total consumer loans	4,582		852		446		5,880		792,125		1,121		799,126
Commercial	8,285		812		190		9,287		788,210		21,622		819,119
Agricultural	700		30		10		740		141,264		625		142,629
Other, including overdrafts	—		—		311		311		2,594		—		2,905
Loans held for investment	24,620		6,558		2,153		33,331		4,924,445		70,848		5,028,624
Mortgage loans originated for sale	—		—		—		—		75,322		—		75,322
Total loans	$	24,620	$	6,558	$	2,153	$	33,331	$	4,999,767	$	70,848	$	5,103,946

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of December 31, 2014	Past Due		Past Due		Past Due		Past Due		Loans		Loans		Loans
Real estate
Commercial	$	4,692	$	1,609	$	331	$	6,632	$	1,605,421	$	27,369	$	1,639,422
Construction:
Land acquisition & development	839		383		—		1,222		210,969		8,252		220,443
Residential	—		475		—		475		95,833		272		96,580
Commercial	100		—		—		100		98,582		2,564		101,246
Total construction loans	939		858		—		1,797		405,384		11,088		418,269
Residential	6,969		645		1,762		9,376		987,735		2,792		999,903
Agricultural	1,624		236		—		1,860		158,957		6,842		167,659
Total real estate loans	14,224		3,348		2,093		19,665		3,157,497		48,091		3,225,253
Consumer:
Indirect consumer	3,235		482		6		3,723		548,757		383		552,863
Other consumer	988		140		32		1,160		142,432		549		144,141
Credit card	369		284		315		968		64,484		15		65,467
Total consumer loans	4,592		906		353		5,851		755,673		947		762,471
Commercial	3,659		994		147		4,800		722,575		12,698		740,073
Agricultural	1,125		—		—		1,125		123,288		446		124,859
Other, including overdrafts	—		—		—		—		3,959		—		3,959
Loans held for investment	23,600		5,248		2,593		31,441		4,762,992		62,182		4,856,615
Mortgage loans originated for sale	—		—		—		—		40,828		—		40,828
Total loans	$	23,600	$	5,248	$	2,593	$	31,441	$	4,803,820	$	62,182	$	4,897,443

Acquired loans that met the criteria for nonaccrual of interest prior to the acquisition were considered performing upon acquisition. If interest on non-accrual loans had been accrued, such income would have been approximately $875 and $1,061 for the three months ended June 30, 2015 and 2014, respectively, and approximately $1,613 and $2,182 for the six months ended June 30, 2015 and 2014 respectively.

The Company considers impaired loans to include all loans, except consumer loans, that are risk rated as doubtful, or have been placed on non-accrual status or renegotiated in troubled debt restructurings. The following tables present information on the Company’s recorded investment in impaired loans as of dates indicated:

As of June 30, 2015	Unpaid Total Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
Real estate:
Commercial	$	60,786	$	31,201	$	17,201	$	48,402	$	1,810
Construction:
Land acquisition & development	22,630		6,452		5,915		12,367		569
Residential	969		332		—		332		—
Commercial	3,796		426		1,590		2,016		1,606
Total construction loans	27,395		7,210		7,505		14,715		2,175
Residential	5,442		2,291		1,429		3,720		127
Agricultural	9,094		6,396		2,202		8,598		712
Total real estate loans	102,717		47,098		28,337		75,435		4,824
Commercial	28,472		11,275		12,298		23,573		3,279
Agricultural	2,110		427		1,058		1,485		618
Total	$	133,299	$	58,800	$	41,693	$	100,493	$	8,721

As of December 31, 2014	Unpaid Total Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
Real estate:
Commercial	$	41,603	$	28,143	$	11,246	$	39,389	$	1,608
Construction:
Land acquisition & development	12,511		7,262		1,615		8,877		574
Residential	459		272		—		272		—
Commercial	2,729		253		2,442		2,695		904
Total construction loans	15,699		7,787		4,057		11,844		1,478
Residential	2,959		2,452		341		2,793		143
Agricultural	8,844		6,444		2,305		8,749		732
Total real estate loans	69,105		44,826		17,949		62,775		3,961
Commercial	16,904		11,882		2,644		14,526		1,190
Agricultural	1,231		342		837		1,179		641
Total	$	87,240	$	57,050	$	21,430	$	78,480	$	5,792

The following table presents the average recorded investment in and income recognized on impaired loans for the periods indicated:

	Three Months Ended June 30,
	2015				2014
	Average Recorded Investment		Income Recognized		Average Recorded Investment		Income Recognized
Real estate:
Commercial	$	39,513	$	211	$	57,588	$	241
Construction:
Land acquisition & development	8,664		12		13,563		11
Residential	338		—		785		—
Commercial	3,492		—		1,471		2
Total construction loans	12,494		12		15,819		13
Residential	3,014		1		5,852		1
Agricultural	8,572		13		9,747		25
Total real estate loans	63,593		237		89,006		280
Commercial	21,841		112		14,162		14
Agricultural	1,004		8		742		6
Total	$	86,438	$	357	$	103,910	$	300

	Six Months Ended June 30,
	2015				2014
	Average Recorded Investment		Income Recognized		Average Recorded Investment		Income Recognized
Real estate:
Commercial	$	40,652	$	361	$	60,870	$	457
Construction:
Land acquisition & development	8,720		22		14,554		22
Residential	302		—		1,051		—
Commercial	3,133		2		918		4
Total construction loans	12,155		24		16,523		26
Residential	2,719		2		5,969		3
Agricultural	8,666		35		9,830		29
Total real estate loans	64,192		422		93,192		515
Commercial	17,874		120		14,231		28
Agricultural	857		13		538		12
Total	$	82,923	$	555	$	107,961	$	555

The amount of interest income recognized by the Company within the period that the loans were impaired was primarily related to loans modified in a troubled debt restructuring that remained on accrual status. Interest payments received on non-accrual impaired loans are applied to principal. Interest income is subsequently recognized only to the extent cash payments are received in excess of principal due. If interest on impaired loans had been accrued, interest income on impaired loans would have been approximately $1,045 and $1,301 for the three months ended June 30, 2015 and 2014, respectively, and approximately $2,011 and $2,412 for the six months ended June 30, 2015 and 2014 respectively.

Collateralized impaired loans are generally recorded at the fair value of the underlying collateral using discounted cash flows, independent appraisals and management estimates based upon current market conditions. For loans measured under the present value of cash flows method, the change in present value attributable to the passage of time, if applicable, is recognized in the provision for loan losses and thus no interest income is recognized.

Modifications of performing loans are made in the ordinary course of business and are completed on a case-by-case basis as negotiated with the borrower. Loan modifications typically include interest rate concessions, interest only periods of less than twelve months, short-term payment deferrals and extension of amortization periods to provide payment relief. A loan modification is considered a troubled debt restructuring if the borrower is experiencing financial difficulties and the Company, for economic or legal reasons, grants a concession to the borrower that it would not otherwise consider. Certain troubled debt restructurings are on non-accrual status at the time of restructuring and are typically returned to accrual status after considering the borrower's sustained repayment performance in accordance with the restructuring agreement for a period of at least six months and management is reasonably assured of future performance. If the troubled debt restructuring meets these performance criteria and the interest rate granted at the modification is equal to or greater than the rate that the Company was willing to accept at the time of the restructuring for a new loan with comparable risk, then the loan will return to performing status and the accrual of interest will resume.

The Company had loans renegotiated in troubled debt restructurings of $37,363 as of June 30, 2015, of which $22,236 were included in non-accrual loans and $15,127 were on accrual status. The Company had loans renegotiated in troubled debt restructurings of $44,227 as of December 31, 2014, of which $23,275 were included in non-accrual loans and $20,952 were on accrual status.

No troubled debt restructurings occurred during the three months ended June 30, 2015. The following table presents information on the Company's troubled debt restructurings that occurred during the six months ended June 30, 2015:    

	Number of Notes	Type of Concession								Principal Balance at Restructure Date
Six Months Ended June 30, 2015		Interest only period		Extension of terms or maturity		Interest rate adjustment		Other
Commercial	1	$	—	$	10	$	—	$	—	$	10
Total loans restructured during period	1	$	—	$	10	$	—	$	—	$	10

For troubled debt restructurings that were on non-accrual status or otherwise deemed impaired before the modification, a specific reserve may already be recorded. In periods subsequent to modification, the Company continues to evaluate all troubled debt restructurings for possible impairment and recognizes impairment through the allowance. Additionally these loans continue to work their way through the credit cycle through charge-off, pay-off or foreclosure. Financial effects of modifications of troubled debt restructurings may include principal loan forgiveness or other charge-offs directly related to the restructuring. The Company had no charge-offs directly related to modifying troubled debt restructurings during the three or six months ended June 30, 2015 or 2014.

The following table presents information on the Company's troubled debt restructurings during the previous 12 months for which there was a payment default during the periods indicated. The Company considers a payment default to occur on troubled debt restructurings when the loan is 90 days or more past due or was placed on non-accrual status after the modification.

	Three Months Ended June 30, 2015			Six Months Ended June 30, 2015
	Number of Notes	Balance		Number of Notes	Balance
Commercial Real Estate	—	$	—	1	$	1,822

At June 30, 2015, there were no material commitments to lend additional funds to borrowers whose existing loans have been renegotiated or are classified as non-accrual.

As part of the on-going and continuous monitoring of the credit quality of the Company’s loan portfolio, management tracks internally assigned risk classifications of loans. The Company adheres to a Uniform Classification System developed jointly by the various bank regulatory agencies to internally risk rate loans. The Uniform Classification System defines three broad categories of criticized assets, which the Company uses as credit quality indicators:

Other Assets Especially Mentioned — includes loans that exhibit weaknesses in financial condition, loan structure or documentation, which if not promptly corrected, may lead to the development of abnormal risk elements.

Substandard — includes loans that are inadequately protected by the current sound worth and paying capacity of the borrower. Although the primary source of repayment for a substandard loan is not currently sufficient; collateral or other sources of repayment are sufficient to satisfy the debt. Continuance of a substandard loan is not warranted unless positive steps are taken to improve the worthiness of the credit.

Doubtful — includes loans that exhibit pronounced weaknesses to a point where collection or liquidation in full, on the basis of currently existing facts, conditions and values, is highly questionable and improbable. Doubtful loans are required to be placed on non-accrual status and are assigned specific loss exposure.

Company management undertakes the same process for assigning risk ratings to acquired loans as it does for originated loans. Acquired loans rated as substandard or lower or that were on non-accrual status or designated as troubled debt restructurings at the time of acquisition are deemed to be acquired credit impaired loans accounted for under ASC Topic 310-30, regardless of whether they are classified as performing or non-performing loans.

The following tables present the Company’s recorded investment in criticized loans by class and credit quality indicator based on the most recent analysis performed as of the dates indicated:

As of June 30, 2015	Other Assets Especially Mentioned		Substandard		Doubtful		Total Criticized Loans
Real estate:
Commercial	$	83,194	$	85,323	$	7,952	$	176,469
Construction:
Land acquisition & development	13,426		14,190		2,031		29,647
Residential	857		2,165		29		3,051
Commercial	—		409		3,161		3,570
Total construction loans	14,283		16,764		5,221		36,268
Residential	8,434		9,387		1,002		18,823
Agricultural	9,826		14,838		595		25,259
Total real estate loans	115,737		126,312		14,770		256,819
Consumer:
Indirect consumer	843		1,454		161		2,458
Other consumer	557		930		349		1,836
Credit card	—		—		—		—
Total consumer loans	1,400		2,384		510		4,294
Commercial	34,776		24,519		15,691		74,986
Agricultural	3,794		6,684		730		11,208
Total	$	155,707	$	159,899	$	31,701	$	347,307

As of December 31, 2014	Other Assets Especially Mentioned		Substandard		Doubtful		Total Criticized Loans
Real estate:
Commercial	$	84,533	$	83,448	$	15,246	$	183,227
Construction:
Land acquisition & development	11,826		15,016		2,507		29,349
Residential	2,029		2,666		—		4,695
Commercial	39		253		2,442		2,734
Total construction loans	13,894		17,935		4,949		36,778
Residential	10,473		10,848		1,121		22,442
Agricultural	10,122		12,328		612		23,062
Total real estate loans	119,022		124,559		21,928		265,509
Consumer:
Indirect consumer	916		1,590		121		2,627
Other consumer	553		1,085		432		2,070
Credit card	—		348		1,263		1,611
Total consumer loans	1,469		3,023		1,816		6,308
Commercial	25,766		32,433		10,273		68,472
Agricultural	7,827		3,660		837		12,324
Total	$	154,084	$	163,675	$	34,854	$	352,613

The Company maintains a credit review function, which is independent of the credit approval process, to assess assigned internal risk classifications and monitor compliance with internal lending policies and procedures. Written action plans with firm target dates for resolution of identified problems are maintained and reviewed on a quarterly basis for all categories of criticized loans.

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Investment Securities

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities

The amortized cost and approximate fair values of investment securities are summarized as follows:

June 30, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-Sale:
Obligations of U.S. government agencies	$	622,237	$	1,087	$	(2,304	)	$	621,020
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	965,430		10,468		(4,463		)	971,435
Private mortgage-backed securities	286		4		(2		)	288
Total	$	1,587,953	$	11,559	$	(6,769	)	$	1,592,743

June 30, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Held-to-Maturity:
State, county and municipal securities	$	181,642	$	4,644	$	(524	)	$	185,762
Corporate securities	50,310		59		(204		)	50,165
U.S agency residential mortgage-backed securities &     collateralized mortgage obligations	314,326		5,945		(3,288		)	316,983
Other investments	412		1		—			413
Total	$	546,690	$	10,649	$	(4,016	)	$	553,323

December 31, 2014	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-Sale:
Obligations of U.S. government agencies	$	725,408	$	895	$	(5,370	)	$	720,933
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	982,764		11,526		(3,624		)	990,666
Private mortgage-backed securities	322		5		(2		)	325
Total	$	1,708,494	$	12,426	$	(8,996	)	$	1,711,924

December 31, 2014	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Held-to-Maturity:
State, county and municipal securities	$	188,941	$	5,949	$	(386	)	$	194,504
Corporate securities	32,565		54		(75		)	32,544
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	353,176		5,563		(1,758		)	356,981
Other Investments	504		—		—			504
Total	$	575,186	$	11,566	$	(2,219	)	$	584,533

Gross realized gains and losses from the disposition of investment securities are summarized in the following table:

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Gross realized gains	$	46	$	18	$	52	$	243
Gross realized losses	—		1		—		155

The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in a continuous unrealized loss position, as of June 30, 2015 and December 31, 2014.

	Less than 12 Months					12 Months or More					Total
June 30, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-Sale:
Obligations of U.S. government agencies	$	106,516	$	(460	)	$	239,339	$	(1,844	)	$	345,855	$	(2,304	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	254,399		(1,480		)	133,709		(2,983		)	388,108		(4,463		)
Private mortgage-backed securities	—		—			83		(2		)	83		(2		)
Total	$	360,915	$	(1,940	)	$	373,131	$	(4,829	)	$	734,046	$	(6,769	)

	Less than 12 Months					12 Months or More					Total
June 30, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Held-to-Maturity:
State, county and municipal securities	$	19,427	$	(165	)	$	13,513	$	(359	)	$	32,940	$	(524	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	85,286		(3,288		)	—		—			85,286		(3,288		)
Corporate securities	31,291		(204		)	—		—			31,291		(204		)
Total	$	136,004	$	(3,657	)	$	13,513	$	(359	)	$	149,517	$	(4,016	)

	Less than 12 Months					12 Months or More					Total
December 31, 2014	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-Sale:
Obligations of U.S. government agencies	$	135,888	$	(702	)	$	309,283	$	(4,668	)	$	445,171	$	(5,370	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	219,214		(887		)	151,380		(2,737		)	370,594		(3,624		)
Private mortgage-backed securities	—		—			90		(2		)	90		(2		)
Total	$	355,102	$	(1,589	)	$	460,753	$	(7,407	)	$	815,855	$	(8,996	)

	Less than 12 Months					12 Months or More					Total
December 31, 2014	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Held-to-Maturity:
State, county and municipal securities	$	7,979	$	(13	)	$	20,097	$	(373	)	$	28,076	$	(386	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	61,201		(1,758		)	—		—			61,201		(1,758		)
Corporate securities	14,755		(75		)	—		—			14,755		(75		)
Total	$	83,935	$	(1,846	)	$	20,097	$	(373	)	$	104,032	$	(2,219	)

The investment portfolio is evaluated quarterly for other-than-temporary declines in the market value of each individual investment security. The Company had 190 and 154 individual investment securities that were in an unrealized loss position as of June 30, 2015 and December 31, 2014, respectively. Unrealized losses as of June 30, 2015 and December 31, 2014 related primarily to fluctuations in the current interest rates. The Company does not have the intent to sell any of the available-for-sale securities in the above table and it is not likely that the Company will have to sell any such securities before a recovery in cost. No impairment losses were recorded during the three and six months ended June 30, 2015 and 2014.

Maturities of investment securities at June 30, 2015 are shown below. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates.

	Available-for-Sale				Held-to-Maturity
June 30, 2015	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Within one year	$	321,079	$	322,976	$	97,639	$	98,594
After one year but within five years	1,189,454		1,192,101		273,778		276,390
After five years but within ten years	58,106		58,232		125,446		127,706
After ten years	19,314		19,434		49,827		50,633
Total	$	1,587,953	$	1,592,743	$	546,690	$	553,323

As of June 30, 2015, the Company had investment securities callable within one year with amortized costs and estimated fair values of $104,832 and $104,923, respectively, including callable structured notes with amortized costs and estimated fair values of $4,996 and $5,004, respectively. These investment securities are primarily classified as available-for-sale and included in the after one year but within five years category in the table above.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Financial assets and financial liabilities measured at fair value on a recurring basis are as follows:

			Fair Value Measurements at Reporting Date Using
As of June 30, 2015	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale:
Obligations of U.S. government agencies	$	621,020	$	—	$	621,020	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	971,435			—	971,435			—
Private mortgage-backed securities	288			—	288			—

			Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale:
Obligations of U.S. government agencies	$	720,933	$	—	$	720,933	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	990,666			—	990,666			—
Private mortgage-backed securities	325			—	325			—

There were no changes in valuation methodologies or transfers between levels of the fair value hierarchy during the six months ended June 30, 2015 or 2014.

The methodologies used by the Company in determining the fair values of each class of financial instruments are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date. The Company obtains fair value measurements for investment securities from an independent pricing service. The vendors chosen by the Company are widely recognized vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. The Company has documented and evaluated the pricing methodologies used by the vendors and maintains internal processes that regularly test valuations. These internal processes include obtaining and reviewing available reports on internal controls, evaluating the prices for reasonableness given market changes, obtaining and evaluating the inputs used in the model for a sample of securities, investigating anomalies and confirming determinations through discussions with the vendor. For investment securities, if needed, a broker may be utilized to determine the reported fair value. Further details on the methods used to estimate the fair value of each class of financial instruments above are discussed below.

Investment Securities Available-for-Sale. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the investment's terms and conditions, among other things.

Additionally, from time to time, certain assets are measured at fair value on a non-recurring basis. Adjustments to fair value generally result from the application of lower-of-cost-or-market accounting or write-downs of individual assets due to impairment.

The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis.

				Fair Value Measurements at Reporting Date Using
As of June 30, 2015	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	50,131	$	—	$	—	$	50,131
Other real estate owned	5,623			—		—	5,623
Long-lived assets to be disposed of by sale	1,083			—		—	1,083
				Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	30,494	$	—	$	—	$	30,494
Other real estate owned	4,554			—		—	4,554
Long-lived assets to be disposed of by sale	1,083			—		—	1,083

Impaired Loans. Collateralized impaired loans are reported at the fair value of the underlying collateral if repayment is expected solely from collateral. The impaired loans are reported at fair value through specific valuation allowance allocations. In addition, when it is determined that the fair value of an impaired loan is less than the recorded investment in the loan, the carrying value of the loan is adjusted to fair value through a charge to the allowance for loan losses. Collateral values are estimated using independent appraisals and management estimates of current market conditions. As of June 30, 2015, certain impaired loans with a carrying value of $70,827 were reduced by specific valuation allowance allocations of $8,721 and partial loan charge-offs of $11,975 resulting in a reported fair value of $50,131. As of December 31, 2014, certain impaired loans with a carrying value of $45,046 were reduced by specific valuation allowance allocations of $5,792 and partial loan charge-offs of $8,760 resulting in a reported fair value of $30,494.

OREO.The fair values of OREO are estimated using independent appraisals and management estimates of current market conditions. Upon initial recognition, write-downs based on the foreclosed asset's fair value at foreclosure are reported through charges to the allowance for loan losses. Periodically, the fair value of foreclosed assets is remeasured with any subsequent write-downs charged to OREO expense in the period in which they are identified. Write-downs of $106 and $10 during the six months ended June 30, 2015 and 2014, respectively, were based on management's estimate of the current fair value of the properties.

Long-lived Assets to be Disposed of by Sale. Long-lived assets to be disposed of by sale are carried at the lower of carrying value or fair value less estimated costs to sell. The fair values of long-lived assets to be disposed of by sale are based upon observable market data and management estimates of current market conditions. As of June 30, 2015 and December 31, 2014, the Company had long-lived assets to be disposed of by sale with carrying values aggregating $1,785 that were reduced by write-downs of $702 resulting in an aggregate fair value of $1,083.

In addition, mortgage loans held for sale are required to be measured at the lower of cost or fair value. The fair value of mortgage loans held for sale is based upon binding contracts or quotes or bids from third party investors. As of June 30, 2015 and December 31, 2014, all mortgage loans held for sale were recorded at cost.

The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair values:

As of June 30, 2015	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Impaired loans	$	50,131	Appraisal	Appraisal adjustment	0%	-	51%	(19%)
Other real estate owned	5,623		Appraisal	Appraisal adjustment	0%	-	50%	(15%)
Long-lived assets to be disposed of by sale	1,083		Appraisal	Appraisal adjustment	0%	-	9%	(5%)
As of December 31, 2014	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Impaired loans	$	30,494	Appraisal	Appraisal adjustment	0%	-	51%	(19%)
Other real estate owned	4,554		Appraisal	Appraisal adjustment	0%	-	50%	(15%)
Long-lived assets to be disposed of by sale	1,083		Appraisal	Appraisal adjustment	0%	-	9%	(5%)

The Company is required to disclose the fair value of financial instruments for which it is practical to estimate fair value. The methodologies for estimating the fair value of financial instruments that are measured at fair value on a recurring or non-recurring basis are discussed above. The methodologies for estimating the fair value of other financial instruments are discussed below. For financial instruments bearing a variable interest rate where no credit risk exists, it is presumed that recorded book values are reasonable estimates of fair value.

Financial Assets. Carrying values of cash, cash equivalents and accrued interest receivable approximate fair values due to the liquid and/or short-term nature of these instruments. Fair values for investment securities held-to-maturity are obtained from an independent pricing service, which considers observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the investment’s terms and conditions, among other things. Fair values of fixed rate loans and variable rate loans that reprice on an infrequent basis are estimated by discounting future cash flows using current interest rates at which similar loans with similar terms would be made to borrowers of similar credit quality. Carrying values of variable rate loans that reprice frequently, and with no change in credit risk, approximate the fair values of these instruments.

Financial Liabilities. The fair values of demand deposits, savings accounts, securities sold under repurchase agreements and accrued interest payable are the amounts payable on demand at the reporting date. The fair values of fixed-maturity certificates of deposit are estimated using external market rates currently offered for deposits with similar remaining maturities. The carrying values of the interest bearing demand notes to the United States Treasury are deemed an approximation of fair values due to the frequent repayment and repricing at market rates. The fixed and floating rate subordinated debentures, floating rate subordinated term loan, notes payable to the FHLB, fixed rate subordinated term debt, and capital lease obligation are estimated by discounting future cash flows using current rates for advances with similar characteristics.

Commitments to Extend Credit and Standby Letters of Credit. The fair value of commitments to extend credit and standby letters of credit, based on fees currently charged to enter into similar agreements, is not significant.

The estimated fair values of financial instruments that are reported in the Company's consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows:

					Fair Value Measurements at Reporting Date Using
As of June 30, 2015	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	506,434	$	506,434	$	506,434	$	—	$	—
Investment securities available-for-sale	1,592,743		1,592,743		—		1,592,743		—
Investment securities held-to-maturity	546,690		553,323		—		553,323		—
Accrued interest receivable	29,008		29,008		—		29,008		—
Mortgage servicing rights, net	14,654		28,320		—		28,320		—
Net loans	5,027,394		5,000,935		—		4,950,804		50,131
Total financial assets	$	7,716,923	$	7,710,763	$	506,434	$	7,154,198	$	50,131
Financial liabilities:
Total deposits, excluding time deposits	$	5,655,166	$	5,655,166	$	5,655,166	$	—	$	—
Time deposits	1,149,235		1,153,809		—		1,153,809		—
Securities sold under repurchase agreements	469,145		469,145		—		469,145		—
Other borrowed funds	3		3		—		3		—
Accrued interest payable	5,366		5,366		—		5,366		—
Long-term debt	43,068		41,584		—		41,584		—
Subordinated debentures held by subsidiary    trusts	82,477		76,393		—		76,393		—
Total financial liabilities	$	7,404,460	$	7,401,466	$	5,655,166	$	1,746,300	$	—

					Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	798,670	$	798,670	$	798,670	$	—	$	—
Investment securities available-for-sale	1,711,924		1,711,924		—		1,711,924		—
Investment securities held-to-maturity	575,186		584,533		—		584,533		—
Accrued interest receivable	27,063		27,063		—		27,063		—
Mortgage servicing rights, net	14,038		21,434		—		21,434		—
Net loans	4,823,243		4,800,725		—		4,770,231		30,494
Total financial assets	$	7,950,124	$	7,944,349	$	798,670	$	7,115,185	$	30,494
Financial liabilities:
Total deposits, excluding time deposits	$	5,767,992	$	5,767,992	$	5,767,992	$	—	$	—
Time deposits	1,238,220		1,244,324		—		1,244,324		—
Securities sold under repurchase agreements	502,250		502,250		—		502,250		—
Other borrowed funds	9		9		—		9		—
Accrued interest payable	5,833		5,833		—		5,833		—
Long-term debt	38,067		37,781		—		37,781		—
Subordinated debentures held by subsidiary    trusts	82,477		75,734		—		75,734		—
Total financial liabilities	$	7,634,848	$	7,633,923	$	5,767,992	$	1,865,931	$	—

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal Proceedings. First Interstate Bank ("the Bank"), a wholly owned banking subsidiary of the Company, was a defendant in a lender liability lawsuit , Kelly Logging Inc. v. First Interstate Bank ("the case"). The case was tried in August 2014 in the Montana Fourth Judicial District, Missoula County in Missoula, Montana ("the court"). On August, 2014, a jury awarded damages to Kelly Logging of $17,047, which included $287 in compensatory damages and $16,760 in punitive damages. On October 1, 2014, a non-final judgment was entered in this matter in the amount of $17,047 plus reasonable attorney fees and interest, subject to the court's mandatory review of the jury's punitive damages award and rulings on pending post-trial motions. On April 21, 2015, the court ruled on the post-trial motions and issued an order upholding the jury's punitive damage award. The order also awarded plaintiff attorney's fees of $7,500 and costs of $91, for a final judgment amount of $24,638 plus interest.

The Company believes it has meritorious grounds for appeal of the final judgment and, in the event mandatory mediation of the case scheduled for third quarter 2015 is unsuccessful, intends to appeal to the Montana Supreme Court to set aside or substantially reduce the punitive damages award and grant the Bank a new trial. In recent appellate cases, the Montana Supreme Court has reduced excessive punitive damage awards to comply with the upper limit of the federal due process guidelines, or to an amount equal to less than ten times the compensatory damages awarded, in even the most egregious cases. Although the Company believes it has meritorious defenses and appellate issues for this litigation, these proceedings are subject to many uncertainties and, given their complexity and scope, the final outcome cannot be predicted and could have a material adverse effect on the consolidated financial condition, results of operations or liquidity of the Company. During third quarter 2014, the Company accrued $4,000 of litigation-related expense, which takes into consideration the federal due process guidelines related to punitive damage awards and the plaintiff's attorneys fees.

In the normal course of business, the Company is involved in various other claims and litigation. In the opinion of management, following consultation with legal counsel, the ultimate liability or disposition thereof of all other claims and litigation is not expected to have a material adverse effect on the consolidated financial condition, results of operations or liquidity of the Company.

Other Commitments. As of June 30, 2015, the Company had commitments under construction agreements of $2,433.

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Long Term Debt

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Long-term Debt [Text Block]

Long-Term Debt

On January 29, 2015, the Company borrowed $4,960 on a 2.28% note payable maturing July 29, 2022, with interest payable monthly and principal due at maturity. The note is collateralized by the Company's equity interest in Universal Sub CDE, LLC, a community development entity owned 99.9% by the Company.

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Schedule of Estimated Fair Values of Financial Instruments by Level of Valuation Inputs (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financial assets:
Investment securities held-to-maturity	$ 553,323	$ 584,533
Carrying Amount
Financial assets:
Cash and cash equivalents	506,434	798,670
Investment securities available-for-sale	1,592,743	1,711,924
Investment securities held-to-maturity	546,690	575,186
Accrued interest receivable	29,008	27,063
Mortgage servicing rights	14,654	14,038
Net loans	5,027,394	4,823,243
Total financial assets	7,716,923	7,950,124
Financial liabilities:
Total deposits, excluding time deposits	5,655,166	5,767,992
Time deposits	1,149,235	1,238,220
Securities sold under repurchase agreements	469,145	502,250
Other borrowed funds	3	9
Accrued interest payable	5,366	5,833
Long-term debt	43,068	38,067
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total financial liabilities	7,404,460	7,634,848
Estimated Fair Value
Financial assets:
Cash and cash equivalents	506,434	798,670
Investment securities available-for-sale	1,592,743	1,711,924
Investment securities held-to-maturity	553,323	584,533
Accrued interest receivable	29,008	27,063
Mortgage servicing rights	28,320	21,434
Net loans	5,000,935	4,800,725
Total financial assets	7,710,763	7,944,349
Financial liabilities:
Total deposits, excluding time deposits	5,655,166	5,767,992
Time deposits	1,153,809	1,244,324
Securities sold under repurchase agreements	469,145	502,250
Other borrowed funds	3	9
Accrued interest payable	5,366	5,833
Long-term debt	41,584	37,781
Subordinated debentures held by subsidiary trusts	76,393	75,734
Total financial liabilities	7,401,466	7,633,923
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	506,434	798,670
Investment securities available-for-sale	0	0
Investment securities held-to-maturity	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Net loans	0	0
Total financial assets	506,434	798,670
Financial liabilities:
Total deposits, excluding time deposits	5,655,166	5,767,992
Time deposits	0	0
Securities sold under repurchase agreements	0	0
Other borrowed funds	0	0
Accrued interest payable	0	0
Long-term debt	0	0
Subordinated debentures held by subsidiary trusts	0	0
Total financial liabilities	5,655,166	5,767,992
Significant Other Observable Inputs (Level 2) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0	0
Investment securities available-for-sale	1,592,743	1,711,924
Investment securities held-to-maturity	553,323	584,533
Accrued interest receivable	29,008	27,063
Mortgage servicing rights	28,320	21,434
Net loans	4,950,804	4,770,231
Total financial assets	7,154,198	7,115,185
Financial liabilities:
Total deposits, excluding time deposits	0	0
Time deposits	1,153,809	1,244,324
Securities sold under repurchase agreements	469,145	502,250
Other borrowed funds	3	9
Accrued interest payable	5,366	5,833
Long-term debt	41,584	37,781
Subordinated debentures held by subsidiary trusts	76,393	75,734
Total financial liabilities	1,746,300	1,865,931
Significant Unobservable Inputs (Level 3) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0	0
Investment securities available-for-sale	0	0
Investment securities held-to-maturity	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Net loans	50,131	30,494
Total financial assets	50,131	30,494
Financial liabilities:
Total deposits, excluding time deposits	0	0
Time deposits	0	0
Securities sold under repurchase agreements	0	0
Other borrowed funds	0	0
Accrued interest payable	0	0
Long-term debt	0	0
Subordinated debentures held by subsidiary trusts	0	0
Total financial liabilities	$ 0	$ 0

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Allowance For Loan Losses

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Allowance For Loan Losses

The following tables present a summary of changes in the allowance for loan losses by portfolio segment for the periods indicated.

Three Months Ended June 30, 2015	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Beginning balance	$	53,659		$	5,499		$	15,196		$	982	$	—	$	75,336
Provision charged to operating expense	461			646			224			9		—		1,340
Less loans charged-off	(610		)	(837		)	(61		)	—		—		(1,508		)
Add back recoveries of loans previously    charged-off	425			520			438			1		—		1,384
Ending balance	$	53,935		$	5,828		$	15,797		$	992	$	—	$	76,552
Six Months Ended June 30, 2015	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Beginning balance	$	53,884		$	5,035		$	14,307		$	974	$	—	$	74,200
Provision charged to operating expense	(570		)	1,771			1,217			17		—		2,435
Less loans charged-off	(795		)	(2,138		)	(435		)	—		—		(3,368		)
Add back recoveries of loans previously    charged-off	1,416			1,160			708			1		—		3,285
Ending balance	$	53,935		$	5,828		$	15,797		$	992	$	—	$	76,552
As of June 30, 2015	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Loans individually evaluated for impairment	$	4,824		$	—		$	3,279		$	618	$	—	$	8,721
Loans collectively evaluated for impairment	49,111			5,828			12,518			374		—		67,831
Allowance for loan losses	$	53,935		$	5,828		$	15,797		$	992	$	—	$	76,552
Total loans:
Individually evaluated for impairment	$	75,435		$	—		$	23,573		$	1,485	$	—	$	100,493
Collectively evaluated for impairment	3,264,732			799,126			795,546			141,144		2,905		5,003,453
Total loans	$	3,340,167		$	799,126		$	819,119		$	142,629	$	2,905	$	5,103,946

Three Months Ended June 30, 2014	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Beginning balance	$	59,830		$	5,377		$	15,701		$	463	$	—	$	81,371
Provision charged to operating expense	(2,011		)	346			(494		)	158		—		(2,001		)
Less loans charged-off	(1,158		)	(934		)	(534		)	—		—		(2,626		)
Add back recoveries of loans previously    charged-off	651			558			313			—		—		1,522
Ending balance	$	57,312		$	5,347		$	14,986		$	621	$	—	$	78,266

Six Months Ended June 30, 2014	Real Estate			Consumer			Commercial			Agriculture			Other		Total
Allowance for loan losses:
Beginning balance	$	63,923		$	6,193		$	14,747		$	476		$	—	$	85,339
Provision charged to operating expense	(5,386		)	(232		)	(1,566		)	183			—		(7,001		)
Less loans charged-off	(2,243		)	(1,780		)	(1,330		)	(64		)	—		(5,417		)
Add back recoveries of loans previously    charged-off	1,018			1,166			3,135			26			—		5,345
Ending balance	$	57,312		$	5,347		$	14,986		$	621		$	—	$	78,266
As of December 31, 2014	Real Estate			Consumer			Commercial			Agriculture			Other		Total
Allowance for loan losses:
Loans individually evaluated for impairment	$	3,961		$	—		$	1,190		$	641		$	—	$	5,792
Loans collectively evaluated for impairment	49,923			5,035			13,117			333			—		68,408
Allowance for loan losses	$	53,884		$	5,035		$	14,307		$	974		$	—	$	74,200
Total loans:
Individually evaluated for impairment	$	62,775		$	—		$	14,526		$	1,179		$	—	$	78,480
Collectively evaluated for impairment	3,203,306			762,471			725,547			123,680			3,959		4,818,963
Total loans	$	3,266,081		$	762,471		$	740,073		$	124,859		$	3,959	$	4,897,443

The Company performs a quarterly assessment of the adequacy of its allowance for loan losses in accordance with generally accepted accounting principles. The methodology used to assess the adequacy is consistently applied to the Company's loan portfolio and consists of three elements: (1) specific valuation allowances based on probable losses on impaired loans; (2) historical valuation allowances based on loan loss experience for similar loans with similar characteristics and trends; and (3) general valuation allowances determined based on changes in the nature of the loan portfolio, overall portfolio quality, industry concentrations, delinquency trends, general economic conditions and other qualitative risk factors both internal and external to the Company.

Specific allowances are established for loans where management has determined that probability of a loss exists by analyzing the borrower’s ability to repay amounts owed, collateral deficiencies and any relevant qualitative or economic factors impacting the loan. Historical valuation allowances are determined by applying percentage loss factors to the credit exposures from outstanding loans. For commercial, agricultural and real estate loans, loss factors are applied based on the internal risk classifications of these loans. For consumer loans, loss factors are applied on a portfolio basis. For commercial, agriculture and real estate loans, loss factor percentages are based on a migration analysis of our historical loss experience, designed to account for credit deterioration. For consumer loans, loss factor percentages are based on a one-year loss history. General valuation allowances are determined by evaluating, on a quarterly basis, changes in the nature and volume of the loan portfolio, overall portfolio quality, industry concentrations, current economic and regulatory conditions and the estimated impact of these factors on historical loss rates.

An allowance for loan losses is established for loans acquired credit impaired and for which the Company projects a decrease in the expected cash flows in periods subsequent to the acquisition of such loans. As of June 30, 2015 and December 31, 2014, the Company's allowance for loan losses included $501 and $287, respectively, related to acquired loans.

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OREO

6 Months Ended

Jun. 30, 2015

Repossessed Assets [Abstract]

Other Real Estate Owned

Other Real Estate Owned

Information with respect to the Company's other real estate owned follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Beginning balance	$	15,134		$	16,594		$	13,554		$	15,504
Additions	1,139			984			4,396			4,399
Valuation adjustments	—			(10		)	(106		)	(10		)
Dispositions	(4,500		)	(1,143		)	(6,071		)	(3,468		)
Ending balance	$	11,773		$	16,425		$	11,773		$	16,425

Foreclosed residential real estate properties of $3,708 were included in other real estate owned as of June 30, 2015. Consumer mortgage loans collateralized by residential real estate property of $65 were in the process of foreclosure as of June 30, 2015.

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Capital Stock

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Common Stock

Capital Stock

The Company had 21,720,287 shares of Class A common stock and 23,786,296 shares of Class B common stock outstanding as of June 30, 2015. The Company had 21,928,932 shares of Class A common stock and 23,859,483 shares of Class B common stock outstanding as of December 31, 2014.

During the six months ended June 30, 2015, the Company repurchased and retired 565,875 shares of its Class A common stock in open market transactions at an aggregate purchase price of $14,674. During the six months ended June 30, 2014, the Company repurchased and retired 325,418 shares of its Class A common stock in a privately negotiated transaction at an aggregate purchase price of $8,143. The repurchases were made pursuant to stock repurchase programs approved by the Company's Board of Directors. Under the terms of the current stock repurchase program, the Company may repurchase up to an additional 434,125 shares of its Class A common stock. All other stock repurchases during the three and six months ended June 30, 2015 and 2014 were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants of the Company's 2006 Equity Compensation Plan.

On April 3, 2015, the Company filed a Registration Statement on Form S-8 to register an additional 2,000,000 shares of Class A common stock to be issued pursuant to the Company's 2015 Equity and Incentive Plan.

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Business Combination (Details) $ in Thousands				6 Months Ended
	Jul. 24, 2015	Mar. 26, 2015	Jul. 31, 2014	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Assets				$ 8,386,218	$ 8,609,936
Loans and Leases Receivable, Net Amount				5,027,394	4,823,243
Deposits				6,804,401	$ 7,006,212
United Bank [Member]
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement		Mar. 26, 2015
Estimate of Payments to Acquire Businesses, Gross				$ 7,234
Number of Communities Adjacent to Existing Market Areas				3
Assets				$ 73,272
Loans and Leases Receivable, Net Amount				37,520
Deposits				$ 63,580
Number of Subsidiary Banks				1
Mountain West Bank
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition			Jul. 31, 2014
Goodwill, Purchase Accounting Adjustments				$ 1,199
Subsequent Event [Member] | United Bank [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Jul. 24, 2015

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Schedule of Actual Capital Amounts and Ratios and Selected Minimum Regulatory Thresholds (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Total risk-based capital:
Actual Amount	$ 924,408	$ 897,769
Actual Ratio	15.40%	16.20%
Adequately Capitalized Amount	$ 481,244	$ 444,685
Adequately Capitalized Ratio	8.00%	8.00%
Well Capitalized Amount	$ 601,555	$ 555,856
Well Capitalized Ratio	10.00%	10.00%
Tier 1 risk-based capital:
Actual Amount	$ 835,198	$ 807,229
Actual Ratio	13.90%	14.50%
Adequately Capitalized Amount	$ 360,933	$ 222,343
Adequately Capitalized Ratio	6.00%	4.00%
Well Capitalized Amount	$ 481,244	$ 333,514
Well Capitalized Ratio	8.00%	6.00%
Common equity tier one risk-based capital:
Actual Amount	$ 755,198
Actual Ratio	12.60%
Adequately Capitalized Amount	$ 270,700
Adequately Capitalized Ratio	4.50%
Well Capitalized Amount	$ 391,011
Well Capitalized Ratio	6.50%
Leverage capital ratio:
Actual Amount	$ 835,198
Actual Ratio	10.10%	9.60%
Adequately Capitalized Amount	$ 330,350	$ 335,897
Adequately Capitalized Ratio	4.00%	4.00%
Well Capitalized Amount	$ 412,938	$ 419,871
Well Capitalized Ratio	5.00%	5.00%
FIB
Total risk-based capital:
Actual Amount	$ 857,522	$ 832,907
Actual Ratio	14.30%	15.10%
Adequately Capitalized Amount	$ 479,416	$ 442,468
Adequately Capitalized Ratio	8.00%	8.00%
Well Capitalized Amount	$ 599,270	$ 553,085
Well Capitalized Ratio	10.00%	10.00%
Tier 1 risk-based capital:
Actual Amount	$ 776,594	$ 754,708
Actual Ratio	13.00%	13.70%
Adequately Capitalized Amount	$ 359,562	$ 221,234
Adequately Capitalized Ratio	6.00%	4.00%
Well Capitalized Amount	$ 479,416	$ 331,851
Well Capitalized Ratio	8.00%	6.00%
Common equity tier one risk-based capital:
Actual Amount	$ 776,594
Actual Ratio	13.00%
Adequately Capitalized Amount	$ 269,671
Adequately Capitalized Ratio	4.50%
Well Capitalized Amount	$ 389,525
Well Capitalized Ratio	6.50%
Leverage capital ratio:
Actual Amount	$ 776,594
Actual Ratio	9.40%	9.20%
Adequately Capitalized Amount	$ 329,180	$ 330,006
Adequately Capitalized Ratio	4.00%	4.00%
Well Capitalized Amount	$ 411,475	$ 412,507
Well Capitalized Ratio	5.00%	5.00%

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Supplemental Disclosures to Consolidated Statement of Cash Flows

6 Months Ended

Jun. 30, 2015

Supplemental Cash Flow Information [Abstract]

Supplemental Disclosures to Consolidated Statement of Cash Flows

Supplemental Disclosures to Consolidated Statement of Cash Flows

The Company transferred loans of $4,396 and $4,399 to OREO during the six months ended June 30, 2015 and 2014, respectively.

The Company transferred internally originated mortgage servicing rights of $1,792 and $1,024 from loans to mortgage servicing assets during the six months ended June 30, 2015 and 2014, respectively.

The Company transferred loans of $10,619 to loans held for sale during the six months ended June 30, 2015.

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Investment Securities (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Amortized Cost and Approximate Fair Values of Investment Securities

The amortized cost and approximate fair values of investment securities are summarized as follows:

June 30, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-Sale:
Obligations of U.S. government agencies	$	622,237	$	1,087	$	(2,304	)	$	621,020
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	965,430		10,468		(4,463		)	971,435
Private mortgage-backed securities	286		4		(2		)	288
Total	$	1,587,953	$	11,559	$	(6,769	)	$	1,592,743

June 30, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Held-to-Maturity:
State, county and municipal securities	$	181,642	$	4,644	$	(524	)	$	185,762
Corporate securities	50,310		59		(204		)	50,165
U.S agency residential mortgage-backed securities &     collateralized mortgage obligations	314,326		5,945		(3,288		)	316,983
Other investments	412		1		—			413
Total	$	546,690	$	10,649	$	(4,016	)	$	553,323

December 31, 2014	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-Sale:
Obligations of U.S. government agencies	$	725,408	$	895	$	(5,370	)	$	720,933
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	982,764		11,526		(3,624		)	990,666
Private mortgage-backed securities	322		5		(2		)	325
Total	$	1,708,494	$	12,426	$	(8,996	)	$	1,711,924

December 31, 2014	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Held-to-Maturity:
State, county and municipal securities	$	188,941	$	5,949	$	(386	)	$	194,504
Corporate securities	32,565		54		(75		)	32,544
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	353,176		5,563		(1,758		)	356,981
Other Investments	504		—		—			504
Total	$	575,186	$	11,566	$	(2,219	)	$	584,533

Realized Gains (Losses) on Investments

Gross realized gains and losses from the disposition of investment securities are summarized in the following table:

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Gross realized gains	$	46	$	18	$	52	$	243
Gross realized losses	—		1		—		155

Gross Unrealized Losses and Fair Values of Investment Securities

The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in a continuous unrealized loss position, as of June 30, 2015 and December 31, 2014.

	Less than 12 Months					12 Months or More					Total
June 30, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-Sale:
Obligations of U.S. government agencies	$	106,516	$	(460	)	$	239,339	$	(1,844	)	$	345,855	$	(2,304	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	254,399		(1,480		)	133,709		(2,983		)	388,108		(4,463		)
Private mortgage-backed securities	—		—			83		(2		)	83		(2		)
Total	$	360,915	$	(1,940	)	$	373,131	$	(4,829	)	$	734,046	$	(6,769	)

	Less than 12 Months					12 Months or More					Total
June 30, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Held-to-Maturity:
State, county and municipal securities	$	19,427	$	(165	)	$	13,513	$	(359	)	$	32,940	$	(524	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	85,286		(3,288		)	—		—			85,286		(3,288		)
Corporate securities	31,291		(204		)	—		—			31,291		(204		)
Total	$	136,004	$	(3,657	)	$	13,513	$	(359	)	$	149,517	$	(4,016	)

	Less than 12 Months					12 Months or More					Total
December 31, 2014	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Available-for-Sale:
Obligations of U.S. government agencies	$	135,888	$	(702	)	$	309,283	$	(4,668	)	$	445,171	$	(5,370	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	219,214		(887		)	151,380		(2,737		)	370,594		(3,624		)
Private mortgage-backed securities	—		—			90		(2		)	90		(2		)
Total	$	355,102	$	(1,589	)	$	460,753	$	(7,407	)	$	815,855	$	(8,996	)

	Less than 12 Months					12 Months or More					Total
December 31, 2014	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Held-to-Maturity:
State, county and municipal securities	$	7,979	$	(13	)	$	20,097	$	(373	)	$	28,076	$	(386	)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations	61,201		(1,758		)	—		—			61,201		(1,758		)
Corporate securities	14,755		(75		)	—		—			14,755		(75		)
Total	$	83,935	$	(1,846	)	$	20,097	$	(373	)	$	104,032	$	(2,219	)

Maturities of Investment Securities

Maturities of investment securities at June 30, 2015 are shown below. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates.

	Available-for-Sale				Held-to-Maturity
June 30, 2015	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Within one year	$	321,079	$	322,976	$	97,639	$	98,594
After one year but within five years	1,189,454		1,192,101		273,778		276,390
After five years but within ten years	58,106		58,232		125,446		127,706
After ten years	19,314		19,434		49,827		50,633
Total	$	1,587,953	$	1,592,743	$	546,690	$	553,323

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Capital Stock (Details) - USD ($) $ in Thousands		6 Months Ended
	Apr. 03, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Class of Stock [Line Items]
Payments for Repurchase of Common Stock		$ 15,264	$ 8,764
Class A Common Stock
Class of Stock [Line Items]
Common Stock, Shares, Outstanding		21,720,287		21,928,932
Stock Repurchased and Retired During Period, Shares		565,875	325,418
Payments for Repurchase of Common Stock		$ 14,674	$ 8,143
Stock Repurchase Program, Remaining Authorized Repurchase Amount		434,125
Class A Common Stock | 2015 Equity Compensation Plan
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	2,000,000
Class B Common Stock
Class of Stock [Line Items]
Common Stock, Shares, Outstanding		23,786,296		23,859,483

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Loans Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning Balance	$ 6,980	$ 0	$ 5,781	$ 0
Accretion Income	(807)	0	(1,355)	0
Reductions Due to Exit Events	0	0	(396)	0
Reclassifications from (to) nonaccretable differences	1,309	0	3,452	0
Ending Balance	$ 7,482	$ 0	$ 7,482	$ 0

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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 22,222	$ 21,077	$ 43,202	$ 42,470
Other comprehensive income (loss), before tax:
Change in net unrealized gains/losses during period	(9,196)	2,816	1,412	17,167
Reclassification adjustment for net (gains) losses included in income	(46)	(17)	(52)	(88)
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity	451	0	902	0
Defined benefit post-retirement benefits plans:
Change in net actuarial loss	13	35	28	70
Other comprehensive income (loss), before tax	(8,778)	2,834	2,290	17,149
Deferred tax benefit (expense) related to other comprehensive income	3,454	(1,115)	(901)	(6,748)
Other comprehensive income (loss), net of tax	(5,324)	1,719	1,389	10,401
Comprehensive income, net of tax	$ 16,898	$ 22,796	$ 44,591	$ 52,871

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Acquisitions

6 Months Ended

Jun. 30, 2015

Business Combinations [Abstract]

Acquisitions

Acquisitions

Absarokee Bancorporation, Inc. On March 26, 2015, the Company entered into an agreement and plan of merger to acquire all of the outstanding stock of Absarokee Bancorporation, Inc. ("Absarokee"), a Montana-based bank holding company that operates one subsidiary bank, United Bank, with branches located in three Montana communities adjacent to the Company's existing market areas.

The acquisition was completed on July 24, 2015 for cash consideration of $7,234. Immediately subsequent to the acquisition, United Bank was merged with and into the Company's existing bank subsidiary, First Interstate Bank ("FIB"). As of the date of the acquisition, Absarokee has total assets of approximately $73,272, loans of approximately $37,520 and deposits of approximately $63,580.

Mountain West Financial Corp. On July 31, 2014, the Company acquired all of the outstanding stock of Mountain West Financial Corp ("MWFC"), a Montana-based bank holding company operating one subsidiary bank, Mountain West Bank, NA ("MWB"). MWB was merged with and into FIB in October 2014. During March 2015, the Company completed its review of MWFC tax items and finalized the fair value of acquired deferred tax assets. Finalization of provisional estimates resulted in a $1,199 decrease in goodwill.

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Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring and Non-Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate Acquired Through Foreclosure, Valuation Adjustments	$ 0	$ 10	$ 106	$ 10
Related Allowance	8,721		8,721		$ 5,792
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0		0		0
Other real estate owned	0		0		0
Long-lived assets to be disposed of by sale	0		0		0
Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0		0		0
Other real estate owned	0		0		0
Long-lived assets to be disposed of by sale	0		0		0
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	50,131		50,131		30,494
Other real estate owned	5,623		5,623		4,554
Real Estate Acquired Through Foreclosure, Valuation Adjustments			106	$ 10
Long-lived assets to be disposed of by sale	1,083		1,083		1,083
Related Allowance	8,721		8,721		5,792
Impaired Financing Receivable, Related Allowance, Partial Loan Charge-Offs	11,975		11,975		8,760
Obligations of U.S. government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0		0
Obligations of U.S. government agencies | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	621,020		621,020		720,933
Obligations of U.S. government agencies | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0		0
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0		0
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	971,435		971,435		990,666
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0		0
Private mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0		0
Private mortgage-backed securities | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	288		288		325
Private mortgage-backed securities | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0		0
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1,592,743		1,592,743		1,711,924
Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	50,131		50,131		30,494
Other real estate owned	5,623		5,623		4,554
Long-lived assets to be disposed of by sale	1,083		1,083		1,083
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0		0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1,592,743		1,592,743		1,711,924
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0		0		0
Estimated Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	50,131		50,131		30,494
Estimated Fair Value | Obligations of U.S. government agencies | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	621,020		621,020		720,933
Estimated Fair Value | U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	971,435		971,435		990,666
Estimated Fair Value | Private mortgage-backed securities | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	288		288		325
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	1,592,743		1,592,743		1,711,924
Carrying Amount | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	70,827		70,827		45,046
Long-lived assets to be disposed of by sale	1,785		1,785		1,785
Change During Period | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets to be disposed of by sale	$ 702		$ 702		$ 702

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Loans (Tables)

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Schedule of Loans by Class

	June 30, 2015		December 31, 2014
Real estate loans:
Commercial	$	1,704,073	$	1,639,422
Construction:
Land acquisition & development	211,889		220,443
Residential	101,023		96,580
Commercial	90,316		101,246
Total construction loans	403,228		418,269
Residential	999,038		999,903
Agricultural	158,506		167,659
Total real estate loans	3,264,845		3,225,253
Consumer:
Indirect consumer	589,479		552,863
Other consumer	144,919		144,141
Credit card	64,728		65,467
Total consumer loans	799,126		762,471
Commercial	819,119		740,073
Agricultural	142,629		124,859
Other, including overdrafts	2,905		3,959
Loans held for investment	5,028,624		4,856,615
Mortgage loans held for sale	75,322		40,828
Total loans	$	5,103,946	$	4,897,443

Schedule of acquired loans with credit impairment

The following table displays the outstanding unpaid principal balance, accrued interest receivable and accrual status of loans acquired with credit impairment as of June 30, 2015 and 2014:    

As of June 30,	2015		2014
Outstanding balance	$	35,555	$	—
Carrying value
Loans on accrual status	22,293		—
Loans on non-accrual status	—		—
Total carrying value	$	22,293	$	—

The following table summarizes changes in the accretable yield for loans acquired credit impaired for the three and six ended June 30, 2015 and 2014:

	Three Months Ended June 30,					Six Months Ended June 30,
	2015			2014		2015			2014
Beginning balance	$	6,980		$	—	$	5,781		$	—
Accretion income	(807		)	—		(1,355		)	—
Reductions due to exit events	—			—		(396		)	—
Reclassifications from (to) nonaccretable differences	1,309			—		3,452			—
Ending balance	$	7,482		$	—	$	7,482		$	—

Schedule of Recorded Investment in Past Due Loans by Class

The following tables present the contractual aging of the Company’s recorded investment in past due loans by class as of the dates indicated:

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of June 30, 2015	Past Due		Past Due		Past Due		Past Due		Loans		Loans		Loans
Real estate
Commercial	$	5,123	$	2,803	$	111	$	8,037	$	1,669,445	$	26,591	$	1,704,073
Construction:
Land acquisition & development	1,075		276		156		1,507		202,620		7,762		211,889
Residential	417		—		—		417		100,274		332		101,023
Commercial	—		—		—		—		86,874		3,442		90,316
Total construction loans	1,492		276		156		1,924		389,768		11,536		403,228
Residential	3,563		1,524		929		6,016		990,453		2,569		999,038
Agricultural	875		261		—		1,136		150,586		6,784		158,506
Total real estate loans	11,053		4,864		1,196		17,113		3,200,252		47,480		3,264,845
Consumer:
Indirect consumer	3,382		507		26		3,915		585,200		364		589,479
Other consumer	785		121		29		935		143,241		743		144,919
Credit card	415		224		391		1,030		63,684		14		64,728
Total consumer loans	4,582		852		446		5,880		792,125		1,121		799,126
Commercial	8,285		812		190		9,287		788,210		21,622		819,119
Agricultural	700		30		10		740		141,264		625		142,629
Other, including overdrafts	—		—		311		311		2,594		—		2,905
Loans held for investment	24,620		6,558		2,153		33,331		4,924,445		70,848		5,028,624
Mortgage loans originated for sale	—		—		—		—		75,322		—		75,322
Total loans	$	24,620	$	6,558	$	2,153	$	33,331	$	4,999,767	$	70,848	$	5,103,946

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of December 31, 2014	Past Due		Past Due		Past Due		Past Due		Loans		Loans		Loans
Real estate
Commercial	$	4,692	$	1,609	$	331	$	6,632	$	1,605,421	$	27,369	$	1,639,422
Construction:
Land acquisition & development	839		383		—		1,222		210,969		8,252		220,443
Residential	—		475		—		475		95,833		272		96,580
Commercial	100		—		—		100		98,582		2,564		101,246
Total construction loans	939		858		—		1,797		405,384		11,088		418,269
Residential	6,969		645		1,762		9,376		987,735		2,792		999,903
Agricultural	1,624		236		—		1,860		158,957		6,842		167,659
Total real estate loans	14,224		3,348		2,093		19,665		3,157,497		48,091		3,225,253
Consumer:
Indirect consumer	3,235		482		6		3,723		548,757		383		552,863
Other consumer	988		140		32		1,160		142,432		549		144,141
Credit card	369		284		315		968		64,484		15		65,467
Total consumer loans	4,592		906		353		5,851		755,673		947		762,471
Commercial	3,659		994		147		4,800		722,575		12,698		740,073
Agricultural	1,125		—		—		1,125		123,288		446		124,859
Other, including overdrafts	—		—		—		—		3,959		—		3,959
Loans held for investment	23,600		5,248		2,593		31,441		4,762,992		62,182		4,856,615
Mortgage loans originated for sale	—		—		—		—		40,828		—		40,828
Total loans	$	23,600	$	5,248	$	2,593	$	31,441	$	4,803,820	$	62,182	$	4,897,443

Schedule of Recorded Investment in Impaired Loans

The following tables present information on the Company’s recorded investment in impaired loans as of dates indicated:

As of June 30, 2015	Unpaid Total Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
Real estate:
Commercial	$	60,786	$	31,201	$	17,201	$	48,402	$	1,810
Construction:
Land acquisition & development	22,630		6,452		5,915		12,367		569
Residential	969		332		—		332		—
Commercial	3,796		426		1,590		2,016		1,606
Total construction loans	27,395		7,210		7,505		14,715		2,175
Residential	5,442		2,291		1,429		3,720		127
Agricultural	9,094		6,396		2,202		8,598		712
Total real estate loans	102,717		47,098		28,337		75,435		4,824
Commercial	28,472		11,275		12,298		23,573		3,279
Agricultural	2,110		427		1,058		1,485		618
Total	$	133,299	$	58,800	$	41,693	$	100,493	$	8,721

As of December 31, 2014	Unpaid Total Principal Balance		Recorded Investment With No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance
Real estate:
Commercial	$	41,603	$	28,143	$	11,246	$	39,389	$	1,608
Construction:
Land acquisition & development	12,511		7,262		1,615		8,877		574
Residential	459		272		—		272		—
Commercial	2,729		253		2,442		2,695		904
Total construction loans	15,699		7,787		4,057		11,844		1,478
Residential	2,959		2,452		341		2,793		143
Agricultural	8,844		6,444		2,305		8,749		732
Total real estate loans	69,105		44,826		17,949		62,775		3,961
Commercial	16,904		11,882		2,644		14,526		1,190
Agricultural	1,231		342		837		1,179		641
Total	$	87,240	$	57,050	$	21,430	$	78,480	$	5,792

The following table presents the average recorded investment in and income recognized on impaired loans for the periods indicated:

	Three Months Ended June 30,
	2015				2014
	Average Recorded Investment		Income Recognized		Average Recorded Investment		Income Recognized
Real estate:
Commercial	$	39,513	$	211	$	57,588	$	241
Construction:
Land acquisition & development	8,664		12		13,563		11
Residential	338		—		785		—
Commercial	3,492		—		1,471		2
Total construction loans	12,494		12		15,819		13
Residential	3,014		1		5,852		1
Agricultural	8,572		13		9,747		25
Total real estate loans	63,593		237		89,006		280
Commercial	21,841		112		14,162		14
Agricultural	1,004		8		742		6
Total	$	86,438	$	357	$	103,910	$	300

	Six Months Ended June 30,
	2015				2014
	Average Recorded Investment		Income Recognized		Average Recorded Investment		Income Recognized
Real estate:
Commercial	$	40,652	$	361	$	60,870	$	457
Construction:
Land acquisition & development	8,720		22		14,554		22
Residential	302		—		1,051		—
Commercial	3,133		2		918		4
Total construction loans	12,155		24		16,523		26
Residential	2,719		2		5,969		3
Agricultural	8,666		35		9,830		29
Total real estate loans	64,192		422		93,192		515
Commercial	17,874		120		14,231		28
Agricultural	857		13		538		12
Total	$	82,923	$	555	$	107,961	$	555

Schedule of Loans Renegotiated in Troubled Debt Restructurings

The Company considers a payment default to occur on troubled debt restructurings when the loan is 90 days or more past due or was placed on non-accrual status after the modification.

	Three Months Ended June 30, 2015			Six Months Ended June 30, 2015
	Number of Notes	Balance		Number of Notes	Balance
Commercial Real Estate	—	$	—	1	$	1,822

The following table presents information on the Company's troubled debt restructurings that occurred during the six months ended June 30, 2015:    

	Number of Notes	Type of Concession								Principal Balance at Restructure Date
Six Months Ended June 30, 2015		Interest only period		Extension of terms or maturity		Interest rate adjustment		Other
Commercial	1	$	—	$	10	$	—	$	—	$	10
Total loans restructured during period	1	$	—	$	10	$	—	$	—	$	10

Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator

The following tables present the Company’s recorded investment in criticized loans by class and credit quality indicator based on the most recent analysis performed as of the dates indicated:

As of June 30, 2015	Other Assets Especially Mentioned		Substandard		Doubtful		Total Criticized Loans
Real estate:
Commercial	$	83,194	$	85,323	$	7,952	$	176,469
Construction:
Land acquisition & development	13,426		14,190		2,031		29,647
Residential	857		2,165		29		3,051
Commercial	—		409		3,161		3,570
Total construction loans	14,283		16,764		5,221		36,268
Residential	8,434		9,387		1,002		18,823
Agricultural	9,826		14,838		595		25,259
Total real estate loans	115,737		126,312		14,770		256,819
Consumer:
Indirect consumer	843		1,454		161		2,458
Other consumer	557		930		349		1,836
Credit card	—		—		—		—
Total consumer loans	1,400		2,384		510		4,294
Commercial	34,776		24,519		15,691		74,986
Agricultural	3,794		6,684		730		11,208
Total	$	155,707	$	159,899	$	31,701	$	347,307

As of December 31, 2014	Other Assets Especially Mentioned		Substandard		Doubtful		Total Criticized Loans
Real estate:
Commercial	$	84,533	$	83,448	$	15,246	$	183,227
Construction:
Land acquisition & development	11,826		15,016		2,507		29,349
Residential	2,029		2,666		—		4,695
Commercial	39		253		2,442		2,734
Total construction loans	13,894		17,935		4,949		36,778
Residential	10,473		10,848		1,121		22,442
Agricultural	10,122		12,328		612		23,062
Total real estate loans	119,022		124,559		21,928		265,509
Consumer:
Indirect consumer	916		1,590		121		2,627
Other consumer	553		1,085		432		2,070
Credit card	—		348		1,263		1,611
Total consumer loans	1,469		3,023		1,816		6,308
Commercial	25,766		32,433		10,273		68,472
Agricultural	7,827		3,660		837		12,324
Total	$	154,084	$	163,675	$	34,854	$	352,613

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Label	Element	Value
Mortgage Servicing Rights (MSR) Impairment (Recovery)	us-gaap_MortgageServicingRightsMSRImpairmentRecovery	$ (11)
Mortgage Servicing Rights (MSR) Impairment (Recovery)	us-gaap_MortgageServicingRightsMSRImpairmentRecovery	(56)
Gain (Loss) on Sale of Debt Investments	us-gaap_GainLossOnSaleOfDebtInvestments	17
Gain (Loss) on Sale of Debt Investments	us-gaap_GainLossOnSaleOfDebtInvestments	$ 46

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Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity
Available-for-Sale Amortized Cost, Within One Year	$ 321,079
Available-for-Sale Amortized Cost, After One Year but Within Five Years	1,189,454
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years	58,106
Available-for-Sale Amortized Cost, After Ten Years	19,314
Available-for-Sale, Amortized Cost	1,587,953	$ 1,708,494
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity
Available-for-Sale Estimated Fair Value, Within One Year	322,976
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years	1,192,101
Available-for-Sale Estimated Fair Value, After Ten Years	58,232
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years	19,434
Available-for-Sale, Estimated Fair Value	1,592,743	1,711,924
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount
Held-to-Maturity Amortized Cost, Within One Year	97,639
Held-to-Maturity Amortized Cost, After One Year but Within Five Years	273,778
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years	125,446
Held-to-Maturity Amortized Cost, After Ten Years	49,827
Held-to-Maturity, Amortized Cost	546,690	575,186
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity
Held-to-Maturity Estimated Fair Value, Within One Year	98,594
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years	276,390
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years	127,706
Held-to-Maturity Estimated Fair Value, After Ten Years	50,633
Held-to-Maturity, Estimated Fair Value	553,323	$ 584,533
Callable Within One Year
Available-for-sale Securities and Held-to-maturity Securities
Investment Securities Primarily Classified as Available-for-Sale, Amortized Costs, After One Year but Within Five Years	104,832
Investment Securities Primarily Classified as Available-for-Sale, Fair Value, After One Year but Within Five Years	104,923
Callable Structured Notes
Available-for-sale Securities and Held-to-maturity Securities
Investment Securities Primarily Classified as Available-for-Sale, Amortized Costs, After One Year but Within Five Years	4,996
Investment Securities Primarily Classified as Available-for-Sale, Fair Value, After One Year but Within Five Years	$ 5,004

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Financial Instruments with Off-Balance Sheet Risk

6 Months Ended

Jun. 30, 2015

Financial Instruments with Off-Balance Sheet Risk [Abstract]

Financial Instruments with Off-Balance Sheet Risk

Financial Instruments with Off-Balance Sheet Risk

The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the commitment contract. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. At June 30, 2015, commitments to extend credit to existing and new borrowers approximated $995,388, which included $528,943 on unused credit card lines and $357,999 with commitment maturities beyond one year.

Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. At June 30, 2015, the Company had outstanding standby letters of credit of $58,105. The estimated fair value of the obligation undertaken by the Company in issuing the standby letters of credit is included in other liabilities in the Company’s consolidated balance sheet.