Glacier Bancorp (GBCI) 10-K 23 Feb 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 13, 2017	Jun. 30, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	GLACIER BANCORP INC
Entity Central Index Key	868,671
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Amendment Flag	false
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 2,002,577,309
Entity Common Stock, Shares Outstanding		76,525,402

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Assets
Cash on hand and in banks		$ 135,268	$ 117,137
Federal funds sold		0	6,080
Interest bearing cash deposits		17,273	70,036
Cash and cash equivalents		152,541	193,253
Investment securities, available-for-sale		2,425,477	2,610,760
Investment securities, held-to-maturity		675,674	702,072
Total investment securities		3,101,151	3,312,832
Loans held for sale		72,927	56,514
Loans receivable	[1]	5,684,463	5,078,681
Allowance for loan and lease losses		(129,572)	(129,697)
Loans receivable, net		5,554,891	4,948,984
Premises and equipment, net		176,198	194,030
Other real estate owned		20,954	26,815
Accrued interest receivable		45,832	44,524
Deferred tax asset		67,121	58,475
Core deposit intangible, net		12,347	14,555
Goodwill		147,053	140,638
Non-marketable equity securities		25,550	27,495
Other assets		74,035	71,117
Total assets		9,450,600	9,089,232
Liabilities
Non-interest bearing deposits		2,041,852	1,918,310
Interest bearing deposits		5,330,427	5,026,698
Securities sold under agreements to repurchase		473,650	423,414
Federal Home Loan Bank advances		251,749	394,131
Other borrowed funds		4,440	6,602
Subordinated debentures		125,991	125,848
Accrued interest payable		3,584	3,517
Other liabilities		102,038	114,062
Total liabilities		8,333,731	8,012,582
Stockholders' Equity
Preferred shares, $0.01 par value per share, 1,000,000 shares authorized, none issued or outstanding		0	0
Common stock, $0.01 par value per share, 117,187,500 shares authorized		765	761
Paid-in capital		749,107	736,368
Retained earnings - substantially restricted		374,379	337,532
Accumulated other comprehensive income		(7,382)	1,989
Total stockholders’ equity		1,116,869	1,076,650
Total liabilities and stockholders’ equity		$ 9,450,600	$ 9,089,232
Number of common stock shares issued and outstanding		76,525,402	76,086,288
[1]	Includes net deferred fees, costs, premiums and discounts of $13,372,000 and $15,529,000 at December 31, 2016 and 2015, respectively.

Consolidated Statements of Fin3

Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	1,000,000	1,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	117,187,500	117,187,500

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Income
Investment securities	$ 90,392	$ 91,086	$ 93,052
Residential real estate loans	33,410	32,153	30,721
Commercial loans	188,949	164,966	145,631
Consumer and other loans	31,402	31,476	30,515
Total interest income	344,153	319,681	299,919
Interest Expense
Deposits	18,402	16,138	13,195
Securities sold under agreements to repurchase	1,207	1,021	865
Federal Home Loan Bank advances	6,221	8,841	9,570
Federal funds purchased and other borrowed funds	67	81	199
Subordinated debentures	3,734	3,194	3,137
Total interest expense	29,631	29,275	26,966
Net Interest Income	314,522	290,406	272,953
Provision for loan losses	2,333	2,284	1,912
Net interest income after provision for loan losses	312,189	288,122	271,041
Non-Interest Income
Service charges and other fees	62,405	59,286	56,043
Miscellaneous loan fees and charges	4,613	4,276	4,696
Gain on sale of loans	33,606	26,389	19,797
(Loss) gain on sale of investments	(1,463)	19	(188)
Other income	8,157	8,791	9,954
Total non-interest income	107,318	98,761	90,302
Non-Interest Expense
Compensation and employee benefits	151,697	134,409	118,571
Occupancy and equipment	25,979	25,505	22,718
Advertising and promotions	8,433	8,661	7,912
Data processing	14,800	11,477	11,387
Other real estate owned	2,895	3,693	2,568
Regulatory assessments and insurance	4,780	5,283	5,064
Core deposit intangible amortization	2,970	2,964	2,811
Other expense	47,160	44,765	41,648
Total non-interest expense	258,714	236,757	212,679
Income Before Income Taxes	160,793	150,126	148,664
Federal and state income tax expense	39,662	33,999	35,909
Net Income	$ 121,131	$ 116,127	$ 112,755
Basic earnings per share	$ 1.59	$ 1.54	$ 1.51
Diluted earnings per share	1.59	1.54	1.51
Dividends declared per share	$ 1.10	$ 1.05	$ 0.98
Average outstanding shares - basic	76,278,463	75,542,455	74,641,957
Average outstanding shares - diluted	76,341,836	75,595,581	74,687,315

Statements of Comprehensive Inc

Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 121,131	$ 116,127	$ 112,755
Other Comprehensive (Loss) Income, Net of Tax
Unrealized (losses) gains on available-for-sale securities	(21,407)	(22,845)	31,569
Reclassification adjustment for losses included in net income	1,335	(69)	204
Net unrealized (losses) gains on available-for-sale securities	(20,072)	(22,914)	31,773
Tax effect	7,776	8,904	(12,313)
Net of tax amount	(12,296)	(14,010)	19,460
Unrealized losses on derivatives used for cash flow hedges	(1,643)	(7,857)	(19,557)
Reclassification adjustment for losses included in net income	6,417	5,025	993
Net unrealized gains (losses) on derivatives used for cash flow hedges	4,774	(2,832)	(18,564)
Tax effect	(1,849)	1,087	7,203
Net of tax amount	2,925	(1,745)	(11,361)
Total other comprehensive (loss) income, net of tax	(9,371)	(15,755)	8,099
Total Comprehensive Income	$ 111,760	$ 100,372	$ 120,854

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings Substantially Restricted	Accumulated Other Comprehensive Income (Loss)
Balance, shares at Dec. 31, 2013		74,373,296
Balance at Dec. 31, 2013	$ 963,250	$ 744	$ 690,918	$ 261,943	$ 9,645
Net income	112,755			112,755
Comprehensive income (loss), accumulated other comprehensive income	8,099				8,099
Comprehensive income, total	120,854
Cash dividends declared	(73,501)			(73,501)
Stock issuances under stock incentive plans, shares		97,064
Stock issuances under stock incentive plans, amount	784	$ 1	783
Stock issued in connection with acquisitions, shares		555,732
Stock issued in connection with acquisitions, amount	15,127	$ 5	15,122
Stock-based compensation and related taxes	1,533		1,533
Balance, shares at Dec. 31, 2014		75,026,092
Balance at Dec. 31, 2014	1,028,047	$ 750	708,356	301,197	17,744
Net income	116,127			116,127
Comprehensive income (loss), accumulated other comprehensive income	(15,755)				(15,755)
Comprehensive income, total	100,372
Cash dividends declared	(79,792)			(79,792)
Stock issuances under stock incentive plans, shares		62,346
Stock issuances under stock incentive plans, amount	17	$ 1	16
Stock issued in connection with acquisitions, shares		997,850
Stock issued in connection with acquisitions, amount	25,939	$ 10	25,929
Stock-based compensation and related taxes	$ 2,067		2,067
Balance, shares at Dec. 31, 2015	76,086,288	76,086,288
Balance at Dec. 31, 2015	$ 1,076,650	$ 761	736,368	337,532	1,989
Net income	121,131			121,131
Comprehensive income (loss), accumulated other comprehensive income	(9,371)				(9,371)
Comprehensive income, total	111,760
Cash dividends declared	(84,284)			(84,284)
Stock issuances under stock incentive plans, shares		89,569
Stock issuances under stock incentive plans, amount	0	$ 1	(1)
Stock issued in connection with acquisitions, shares		349,545
Stock issued in connection with acquisitions, amount	10,465	$ 3	10,462
Stock-based compensation and related taxes	$ 2,278		2,278
Balance, shares at Dec. 31, 2016	76,525,402	76,525,402
Balance at Dec. 31, 2016	$ 1,116,869	$ 765	$ 749,107	$ 374,379	$ (7,382)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash dividends declared per share	$ 1.10	$ 1.05	$ 0.98
Retained Earnings Substantially Restricted
Cash dividends declared per share	$ 1.10	$ 1.05	$ 0.98

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)		Dec. 31, 2015USD ($)		Dec. 31, 2014USD ($)
Operating Activities
Net income	$ 121,131		$ 116,127		$ 112,755
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,333		2,284		1,912
Net amortization of investment securities premiums and discounts	26,210		26,709		27,491
Loans held for sale originated or acquired	(1,098,864)		(888,676)		(669,144)
Proceeds from sales of loans held for sale	1,155,186		925,353		705,178
Gain on sale of loans	(33,606)		(26,389)		(19,797)
Loss (gain) on sale of investments	1,463		(19)		188
Bargain purchase gain	0		0		(680)
Stock-based compensation expense, net of tax benefits	1,836		1,087		859
Excess tax benefits from stock-based compensation	(8)		(102)		(138)
Depreciation of premises and equipment	15,294		14,365		12,108
Loss (gain) on sale of other real estate owned and write-downs, net	1,217		938		(937)
Core deposit intangible amortization	2,970		2,964		2,811
Deferred tax (benefit) expense	(82)	[1]	(4,080)	[1]	5,931	[1]
Amortization of qualified affordable housing project investments	1,079		1,175		1,270
Amortization of New Markets Tax Credit project investments	1,453		2,323		1,893
Net (increase) decrease in accrued interest receivable	(1,160)		(2,377)		2,648
Net increase in other assets	(9,494)		(793)		(5,702)
Net increase (decrease) in accrued interest payable	55		(828)		567
Net (decrease) increase in other liabilities	(6,611)		1,405		3,521
Net cash provided by operating activities	180,402		171,466		182,734
Investing Activities
Sales of available-for-sale securities	62,817		136,777		169,372
Maturities, prepayments and calls of available-for-sale securities	662,003		663,828		628,238
Purchases of available-for-sale securities	(585,064)		(961,224)		(281,332)
Maturities, prepayments and calls of held-to-maturity securities	25,405		20,997		8,930
Purchases of held-to-maturity securities	(1,222)		(203,554)		(49,691)
Principal collected on loans	1,775,173		1,737,508		1,418,517
Loans originated or acquired	(2,375,136)		(2,112,154)		(1,735,155)
Net decrease (increase) of premises and equipment and other real estate owned	5,197		(18,224)		(14,389)
Proceeds from sale of other real estate owned	10,145		10,278		15,714
Net proceeds from sale of non-marketable equity securities	6,017		27,770		801
Net cash received (paid) in acquisitions	6,701		21,427		(2,112)
Net cash (used in) provided by investing activities	(407,964)		(676,571)		158,893
Financing Activities
Net increase in deposits	368,907		215,650		455,604
Net increase in securities sold under agreements to repurchase	50,236		24,951		83,713
Net (decrease) increase in short-term Federal Home Loan Bank advances	(100,000)		140,000		(421,000)
Proceeds from long-term Federal Home Loan Bank advances	0		50,000		192,500
Repayments of long-term Federal Home Loan Bank advances	(45,642)		(94,749)		(314,738)
Net decrease in other borrowed funds	(2,019)		(566)		(933)
Cash dividends paid	(84,040)		(79,456)		(50,944)
Excess tax benefits from stock-based compensation	8		102		138
Stock-based compensation activity	(600)		17		785
Net cash provided by (used in) financing activities	186,850		255,949		(54,875)
Net (decrease) increase in cash and cash equivalents	(40,712)		(249,156)		286,752
Cash and cash equivalents at beginning of period	193,253		442,409		155,657
Cash and cash equivalents at end of period	152,541		193,253		442,409
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	29,576		30,103		26,398
Cash paid during the period for income taxes	36,225		39,622		33,343
Supplemental Disclosure of Non-Cash Investing Activities
Transfer of investment securities from available-for-sale to held-to-maturity	0		0		484,583
Sale and refinancing of other real estate owned	728		446		1,361
Transfer of loans to other real estate owned	5,198		7,989		11,493
Dividend declared but not paid	23,137		22,893		22,557
Fair value of common stock shares issued	10,465		25,939		15,127
Cash consideration for outstanding shares	3,475		28,364		16,690
Fair value of assets acquired	69,750		434,963		349,167
Liabilities assumed	$ 62,225		$ 391,592		$ 316,670
[1]	Includes tax benefit of operating loss carryforwards of $571,000, $391,000 and $0 for the years ended December 31, 2016, 2015, and 2014, respectively.

Nature of Operations and Summar

Nature of Operations and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Summary of Significant Accounting Policies	Nature of Operations and Summary of Significant Accounting Policies General Glacier Bancorp, Inc. (“Company”) is a Montana corporation headquartered in Kalispell, Montana. The Company provides a full range of banking services to individuals and businesses in Montana, Idaho, Wyoming, Colorado, Utah and Washington through its wholly-owned bank subsidiary, Glacier Bank (“Bank”). The Company offers a wide range of banking products and services, including transaction and savings deposits, real estate, commercial, agriculture and consumer loans and mortgage origination services. The Company serves individuals, small to medium-sized businesses, community organizations and public entities. The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change include: 1) the determination of the allowance for loan and lease losses (“ALLL” or “allowance”); 2) the valuation of investment securities; 3) the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans; and 4) the evaluation of goodwill impairment. For the determination of the ALLL and real estate valuation estimates, management obtains independent appraisals (new or updated) for significant items. Estimates relating to investment valuations are obtained from independent third parties. Estimates relating to the evaluation of goodwill for impairment are determined based on internal calculations using significant independent party inputs. Principles of Consolidation The consolidated financial statements of the Company include the parent holding company and the Bank. The Bank consists of thirteen bank divisions, a treasury division and an information technology division. The treasury division includes the Bank’s investment portfolio and wholesale borrowings and the information technology division includes the Bank’s internal data processing and information technology expenses. The Bank divisions operate under separate names, management teams and advisory directors. The Company considers the Bank to be its sole operating segment as the Bank 1) engages in similar bank business activity from which it earns revenues and incurs expenses; 2) the operating results of the Bank are regularly reviewed by the Chief Executive Officer (i.e., the chief operating decision maker) who makes decisions about resources to be allocated to the Bank; and 3) financial information is available for the Bank. All significant inter-company transactions have been eliminated in consolidation. The Bank has subsidiary interests in variable interest entities (“VIE”) for which the Bank has both the power to direct the VIE’s significant activities and the obligation to absorb losses or right to receive benefits of the VIE that could potentially be significant to the VIE. These subsidiary interests are included in the Company’s consolidated financial statements. The parent holding company also owns non-bank subsidiaries that have issued trust preferred securities as Tier 1 capital instruments. The trust subsidiaries are not included in the Company’s consolidated financial statements. The Company's investments in the trust subsidiaries are included in non-marketable equity securities on the Company's statement of financial condition. In August 2016, the Company completed its acquisition of Treasure State Bank (“TSB”), a community bank based in Missoula, Montana. In October 2015, the Company completed its acquisition of Cañon Bank Corporation and its wholly-owned subsidiary, Cañon National Bank, a community bank based in Cañon City, Colorado (collectively, “Cañon”). In February 2015, the Company completed its acquisition of Montana Community Banks, Inc. and its wholly-owned subsidiary, Community Bank, Inc., a community bank based in Ronan, Montana (collectively, “CB”). In August 2014, the Company completed its acquisition of FNBR Holding Corporation and its wholly-owned subsidiary, First National Bank of the Rockies, a community bank based in Grand Junction, Colorado. The transactions were accounted for using the acquisition method, and their results of operations have been included in the Company’s consolidated financial statements as of the acquisition dates. In February 2015, the Financial Accounting Standards Board’s (“FASB”) amended consolidation guidance by modifying the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities and by changing how entities analyze related-party relationships and fee arrangements. As a result of this amendment, the Company determined it was no longer the primary beneficiary of certain partnerships related to its Low-Income Housing Tax Credit (“LIHTC”) investments and, as a result, deconsolidated these investments effective January 1, 2016. There was no material effect on the Company’s financial condition or results of operations upon adoption of this accounting guidance. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) Pending Acquisition During the fourth quarter of 2016, the Company announced the signing of a definitive agreement to acquire TFB Bancorp, Inc. and its wholly-owned subsidiary, The Foothills Bank, a community bank based in Yuma, Arizona (collectively, “Foothills”). Foothills provides banking services to individuals and businesses in Arizona, with banking offices located in Yuma, Prescott and Casa Grande, Arizona. As of December 31, 2016, Foothills had total assets of $334,792,000 , gross loans of $279,777,000 and total deposits of $282,198,000 . The acquisition is subject to required regulatory approvals and other customary conditions of closing and is expected to be completed during the second quarter of 2017. Foothills will be merged into Glacier Bank and will operate as a separate bank division under its existing name and management team. Cash and Cash Equivalents Cash and cash equivalents include cash on hand, cash held as demand deposits at various banks and the Federal Reserve Bank (“FRB”), interest bearing deposits, federal funds sold, and liquid investments with original maturities of three months or less. The Bank is required to maintain an average reserve balance with either the FRB or in the form of cash on hand. The required reserve balance at December 31, 2016 was $4,169,000 . Investment Securities Debt securities for which the Company has the positive intent and ability to hold to maturity are classified as held-to-maturity and are carried at amortized cost. Debt and equity securities held primarily for the purpose of selling in the near term are classified as trading securities and are reported at fair market value, with unrealized gains and losses included in income. Debt and equity securities not classified as held-to-maturity or trading are classified as available-for-sale and are reported at fair value with unrealized gains and losses, net of income taxes, as a separate component of other comprehensive income. Premiums and discounts on investment securities are amortized or accreted into income using a method that approximates the interest method. The objective of the interest method is to calculate periodic interest income at a constant effective yield. The Company does not have any investment securities classified as trading securities. The Company reviews and analyzes the various risks that may be present within the investment portfolio on an ongoing basis, including market risk and credit risk. Market risk is the risk to an entity’s financial condition resulting from adverse changes in the value of its holdings arising from movements in interest rates, foreign exchange rates, equity prices or commodity prices. The Company assesses the market risk of individual securities as well as the investment portfolio as a whole. Credit risk, broadly defined, is the risk that an issuer or counterparty will fail to perform on an obligation. A security is investment grade if the issuer has an adequate capacity to meet its commitment over the expected life of the investment, i.e., the risk of default is low and full and timely repayment of interest and principal is expected. To determine investment grade status for securities, the Company conducts due diligence of the creditworthiness of the issuer or counterparty prior to acquisition and ongoing thereafter consistent with the risk characteristics of the security and the overall risk of the investment portfolio. Credit quality due diligence takes into account the extent to which a security is guaranteed by the U.S. government and other agencies of the U.S. government. The depth of the due diligence is based on the complexity of the structure, the size of the security, and takes into account material positions and specific groups of securities or stratifications for analysis and review of similar risk positions. The due diligence includes consideration of payment performance, collateral adequacy, internal analyses, third party research and analytics, external credit ratings and default statistics. For additional information relating to investment securities, see Note 2. Temporary versus Other-Than-Temporary Impairment The Company assesses individual securities in its investment portfolio for impairment at least on a quarterly basis, and more frequently when economic or market conditions warrant. An investment is impaired if the fair value of the security is less than its carrying value at the financial statement date. If impairment is determined to be other-than-temporary, an impairment loss is recognized by reducing the amortized cost for the credit loss portion of the impairment with a corresponding charge to earnings for a like amount. In evaluating impaired securities for other-than-temporary impairment losses, management considers 1) the severity and duration of the impairment; 2) the credit ratings of the security; and 3) the overall deal structure, including the Company’s position within the structure, the overall and near term financial performance of the issuer and underlying collateral, delinquencies, defaults, loss severities, recoveries, prepayments, cumulative loss projections, discounted cash flows and fair value estimates. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) In evaluating debt securities for other-than-temporary impairment losses, management assesses whether the Company intends to sell the security or if it is more-likely-than-not that the Company will be required to sell the debt security. In so doing, management considers contractual constraints, liquidity, capital, asset/liability management and securities portfolio objectives. If impairment is determined to be other-than-temporary and the Company does not intend to sell a debt security, and it is more-likely-than-not the Company will not be required to sell the security before recovery of its cost basis, it recognizes the credit component of an other-than-temporary impairment of a debt security in earnings and the remaining portion (noncredit portion) in other comprehensive income, net of tax. For held-to-maturity debt securities, the amount of an other-than-temporary impairment recorded in other comprehensive income for the noncredit portion of a previous other-than-temporary impairment is amortized prospectively, as an increase to the carrying amount of the security, over the remaining life of the security on the basis of the timing of future estimated cash flows of the security. If impairment is determined to be other-than-temporary and the Company intends to sell a debt security or it is more-likely-than-not the Company will be required to sell the security before recovery of its cost basis, it recognizes the entire amount of the other-than-temporary impairment in earnings. For debt securities with other-than-temporary impairment, the previous amortized cost basis less the other-than-temporary impairment recognized in earnings shall be the new amortized cost basis of the security. In subsequent periods, the Company accretes into interest income the difference between the new amortized cost basis and cash flows expected to be collected prospectively over the life of the debt security. Loans Held for Sale Loans held for sale generally consist of long-term, fixed rate, conforming, single-family residential real estate loans and are carried at the lower of cost or estimated fair value in the aggregate. Net unrealized losses, if any, are recognized by charges to non-interest income. A sale is recognized when the Company surrenders control of the loan and consideration, is received in exchange. A gain is recognized in non-interest income to the extent the sales price exceeds the carrying value of the sold loan. Loans Receivable Loans that are intended to be held-to-maturity are reported at the unpaid principal balance less net charge-offs and adjusted for deferred fees and costs on originated loans and unamortized premiums or discounts on acquired loans. Fees and costs on originated loans and premiums or discounts on acquired loans are deferred and subsequently amortized or accreted as a yield adjustment over the expected life of the loan utilizing the interest method. The objective of the interest method is to calculate periodic interest income at a constant effective yield. When a loan is paid off prior to maturity, the remaining fees and costs on originated loans and premiums or discounts on acquired loans are immediately recognized into interest income. The Company’s loan segments, which are based on the purpose of the loan, include residential real estate, commercial, and consumer loans. The Company’s loan classes, a further disaggregation of segments, include residential real estate loans (residential real estate segment), commercial real estate and other commercial loans (commercial segment), and home equity and other consumer loans (consumer segment). Loans that are thirty days or more past due based on payments received and applied to the loan are considered delinquent. Loans are designated non-accrual and the accrual of interest is discontinued when the collection of the contractual principal or interest is unlikely. A loan is typically placed on non-accrual when principal or interest is due and has remained unpaid for ninety days or more. When a loan is placed on non-accrual status, interest previously accrued but not collected is reversed against current period interest income. Subsequent payments on non-accrual loans are applied to the outstanding principal balance if doubt remains as to the ultimate collectability of the loan. Interest accruals are not resumed on partially charged-off impaired loans. For other loans on nonaccrual, interest accruals are resumed on such loans only when they are brought fully current with respect to interest and principal and when, in the judgment of management, the loans are estimated to be fully collectible as to both principal and interest. The Company considers impaired loans to be the primary credit quality indicator for monitoring the credit quality of the loan portfolio. Loans are designated impaired when, based upon current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement and, therefore, the Company has serious doubts as to the ability of such borrowers to fulfill the contractual obligation. Impaired loans include non-performing loans (i.e., non-accrual loans and accruing loans ninety days or more past due) and accruing loans under ninety days past due where it is probable payments will not be received according to the loan agreement (e.g., troubled debt restructuring). Interest income on accruing impaired loans is recognized using the interest method. The Company measures impairment on a loan-by-loan basis in the same manner for each class within the loan portfolio. An insignificant delay or shortfall in the amounts of payments would not cause a loan or lease to be considered impaired. The Company determines the significance of payment delays and shortfalls on a case-by-case basis, taking into consideration all of the facts and circumstances surrounding the loan and the borrower, including the length and reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest due. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) A restructured loan is considered a troubled debt restructuring (“TDR”) if the creditor, for economic or legal reasons related to the debtor’s financial difficulties, grants a concession to the debtor that it would not otherwise consider. The Company periodically enters into restructure agreements with borrowers whereby the loans were previously identified as TDRs. When such circumstances occur, the Company carefully evaluates the facts of the subsequent restructure to determine the appropriate accounting and under certain circumstances it may be acceptable not to account for the subsequently restructured loan as a TDR. When assessing whether a concession has been granted by the Company, any prior forgiveness on a cumulative basis is considered a continuing concession. A TDR loan is considered an impaired loan and a specific valuation allowance is established when the fair value of the collateral-dependent loan or present value of the loan’s expected future cash flows (discounted at the loan’s effective interest rate based on the original contractual rate) is lower than the carrying value of the impaired loan. The Company has made the following types of loan modifications, some of which were considered a TDR: • reduction of the stated interest rate for the remaining term of the debt; • extension of the maturity date(s) at a stated rate of interest lower than the current market rate for newly originated debt having similar risk characteristics; and • reduction of the face amount of the debt as stated in the debt agreements. The Company recognizes that while borrowers may experience deterioration in their financial condition, many continue to be creditworthy customers who have the willingness and capacity for debt repayment. In determining whether non-restructured or unimpaired loans issued to a single or related party group of borrowers should continue to accrue interest when the borrower has other loans that are impaired or are TDRs, the Company on a quarterly or more frequent basis performs an updated and comprehensive assessment of the willingness and capacity of the borrowers to timely and ultimately repay their total debt obligations, including contingent obligations. Such analysis takes into account current financial information about the borrowers and financially responsible guarantors, if any, including for example: • analysis of global, i.e., aggregate debt service for total debt obligations; • assessment of the value and security protection of collateral pledged using current market conditions and alternative market assumptions across a variety of potential future situations; and • loan structures and related covenants. For additional information relating to loans, see Note 3. Allowance for Loan and Lease Losses Based upon management’s analysis of the Company’s loan portfolio, the balance of the ALLL is an estimate of probable credit losses known and inherent within the Bank’s loan portfolio as of the date of the consolidated financial statements. The ALLL is analyzed at the loan class level and is maintained within a range of estimated losses. Determining the adequacy of the ALLL involves a high degree of judgment and is inevitably imprecise as the risk of loss is difficult to quantify. The determination of the ALLL and the related provision for loan losses is a critical accounting estimate that involves management’s judgments about all known relevant internal and external environmental factors that affect loan losses. The balance of the ALLL is highly dependent upon management’s evaluations of borrowers’ current and prospective performance, appraisals and other variables affecting the quality of the loan portfolio. Individually significant loans and major lending areas are reviewed periodically to determine potential problems at an early date. Changes in management’s estimates and assumptions are reasonably possible and may have a material impact upon the Company’s consolidated financial statements, results of operations or capital. Risk characteristics considered in the ALLL analysis applicable to each loan class within the Company's loan portfolio are as follows: Residential Real Estate. Residential real estate loans are secured by owner-occupied 1-4 family residences. Repayment of these loans is primarily dependent on the personal income and credit rating of the borrowers. Credit risk in these loans is impacted by economic conditions within the Company’s market areas that affect the value of the property securing the loans and affect the borrowers' personal incomes. Mitigating risk factors for this loan class include a large number of borrowers, geographic dispersion of market areas and the loans are originated for relatively smaller amounts. Commercial Real Estate . Commercial real estate loans typically involve larger principal amounts, and repayment of these loans is generally dependent on the successful operation of the property securing the loan and/or the business conducted on the property securing the loan. Credit risk in these loans is impacted by the creditworthiness of a borrower, valuation of the property securing the loan and conditions within the local economies in the Company’s diverse, geographic market areas. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) Commercial . Commercial loans consist of loans to commercial customers for use in financing working capital needs, equipment purchases and business expansions. The loans in this category are repaid primarily from the cash flow of a borrower’s principal business operation. Credit risk in these loans is driven by creditworthiness of a borrower and the economic conditions that impact the cash flow stability from business operations across the Company’s diverse, geographic market areas. Home Equity . Home equity loans consist of junior lien mortgages and first and junior lien lines of credit (revolving open-end and amortizing closed-end) secured by owner-occupied 1-4 family residences. Repayment of these loans is primarily dependent on the personal income and credit rating of the borrowers. Credit risk in these loans is impacted by economic conditions within the Company’s market areas that affect the value of the residential property securing the loans and affect the borrowers' personal incomes. Mitigating risk factors for this loan class are a large number of borrowers, geographic dispersion of market areas and the loans are originated for terms that range from 10 years to 15 years. Other Consumer . The other consumer loan portfolio consists of various short-term loans such as automobile loans and loans for other personal purposes. Repayment of these loans is primarily dependent on the personal income of the borrowers. Credit risk is driven by consumer economic factors (such as unemployment and general economic conditions in the Company’s diverse, geographic market area) and the creditworthiness of a borrower. The ALLL consists of a specific valuation allowance component and a general valuation allowance component. The specific component relates to loans that are determined to be impaired and individually evaluated for impairment. The Company measures impairment on a loan-by-loan basis based on the present value of expected future cash flows discounted at the loan’s effective interest rate, except when it is determined that repayment of the loan is expected to be provided solely by the underlying collateral. For impairment based on expected future cash flows, the Company considers all information available as of a measurement date, including past events, current conditions, potential prepayments, and estimated cost to sell when such costs are expected to reduce the cash flows available to repay or otherwise satisfy the loan. For alternative ranges of cash flows, the likelihood of the possible outcomes is considered in determining the best estimate of expected future cash flows. The effective interest rate for a loan restructured in a TDR is based on the original contractual rate. For collateral-dependent loans and real estate loans for which foreclosure or a deed-in-lieu of foreclosure is probable, impairment is measured by the fair value of the collateral, less estimated cost to sell. The fair value of the collateral is determined primarily based upon appraisal or evaluation of the underlying real property value. The general valuation allowance component relates to probable credit losses inherent in the balance of the loan portfolio based on historical loss experience, adjusted for changes in trends and conditions of qualitative or environmental factors. The historical loss experience is based on the previous twelve quarters loss experience by loan class adjusted for risk characteristics in the existing loan portfolio. The same trends and conditions are evaluated for each class within the loan portfolio; however, the risk characteristics are weighted separately at the individual class level based on the Company’s judgment and experience. The changes in trends and conditions evaluated for each class within the loan portfolio include the following: • Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses; • Changes in global, national, regional, and local economic and business conditions and developments that affect the collectability of the portfolio, including the condition of various market segments; • Changes in the nature and volume of the portfolio and in the terms of loans; • Changes in experience, ability, and depth of lending management and other relevant staff; • Changes in the volume and severity of past due and nonaccrual loans; • Changes in the quality of the Company’s loan review system; • Changes in the value of underlying collateral for collateral-dependent loans; • The existence and effect of any concentrations of credit, and changes in the level of such concentrations; and • The effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the Company’s existing portfolio. The ALLL is increased by provisions for loan losses which are charged to expense. The portions of loan balances determined by management to be uncollectible are charged off as a reduction of the ALLL and recoveries of amounts previously charged off are credited as an increase to the ALLL. The Company’s charge-off policy is consistent with bank regulatory standards. Consumer loans generally are charged off when the loan becomes over 120 days delinquent. Real estate acquired as a result of foreclosure or by deed-in-lieu of foreclosure is classified as real estate owned until such time as it is sold. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) At acquisition date, the assets and liabilities of acquired banks are recorded at their estimated fair values which results in no ALLL carried over from acquired banks. Subsequent to acquisition, an allowance will be recorded on the acquired loan portfolios for further credit deterioration, if any. Premises and Equipment Premises and equipment are accounted for at cost less depreciation. Depreciation is computed on a straight-line method over the estimated useful lives or the term of the related lease. The estimated useful life for office buildings is 15 - 40 years and the estimated useful life for furniture, fixtures, and equipment is 3 - 10 years. Interest is capitalized for any significant building projects. For additional information relating to premises and equipment, see Note 4. Leases The Company leases certain land, premises and equipment from third parties under operating and capital leases. The lease payments for operating lease agreements are recognized on a straight-line basis. The present value of the future minimum rental payments for capital leases is recognized as an asset when the lease is formed. Lease improvements incurred at the inception of the lease are recorded as an asset and depreciated over the initial term of the lease and lease improvements incurred subsequently are depreciated over the remaining term of the lease. For additional information relating to leases, see Note 4. Other Real Estate Owned Property acquired by foreclosure or deed-in-lieu of foreclosure is initially recorded at fair value, less estimated selling cost, at acquisition date (i.e., cost of the property). The Company is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan upon the occurrence of either the Company obtaining legal title to the property or the borrower conveying all interest in the property through a deed-in-lieu or similar agreement. Fair value is determined as the amount that could be reasonably expected in a current sale between a willing buyer and a willing seller in an orderly transaction between market participants at the measurement date. Subsequent to the initial acquisition, if the fair value of the asset, less estimated selling cost, is less than the cost of the property, a loss is recognized in other expense and the asset carrying value is reduced. Gain or loss on disposition of other real estate owned (“OREO”) is recorded in non-interest income or non-interest expense, respectively. In determining the fair value of the properties on the date of transfer and any subsequent estimated losses of net realizable value, the fair value of other real estate acquired by foreclosure or deed-in-lieu of foreclosure is determined primarily based upon appraisal or evaluation of the underlying property value. Long-lived Assets Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An asset is deemed impaired if the sum of the expected future cash flows is less than the carrying amount of the asset. If impaired, an impairment loss is recognized in other expense to reduce the carrying value of the asset to fair value. At December 31, 2016 and 2015 , no long-lived assets were considered materially impaired. Business Combinations and Intangible Assets Acquisition accounting requires the total purchase price to be allocated to the estimated fair values of assets acquired and liabilities assumed, including certain intangible assets. Goodwill is recorded if the purchase price exceeds the net fair value of assets acquired and a bargain purchase gain is recorded in other income if the net fair value of assets acquired exceeds the purchase price. Adjustment of the allocated purchase price may be related to fair value estimates for which all information has not been obtained of the acquired entity known or discovered during the allocation period, the period of time required to identify and measure the fair values of the assets and liabilities acquired in the business combination. The allocation period is generally limited to one year following consummation of a business combination. Core deposit intangible represents the intangible value of depositor relationships resulting from deposit liabilities assumed in acquisitions and is amortized using an accelerated method based on an estimated runoff of the related deposits. The core deposit intangible is evaluated for impairment and recoverability whenever events or changes in circumstances indicate that its carrying amount may not be recoverable, with any changes in estimated useful life accounted for prospectively over the revised remaining life. For additional information relating to core deposit intangibles, see Note 5. The Company tests goodwill for impairment at the reporting

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following tables present the amortized cost, the gross unrealized gains and losses and the fair value of the Company’s investment securities: December 31, 2016 Amortized Cost Gross Unrealized Fair Value (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 39,554 15 (162 ) 39,407 U.S. government sponsored enterprises 19,557 55 (42 ) 19,570 State and local governments 775,395 20,941 (9,963 ) 786,373 Corporate bonds 471,569 1,175 (793 ) 471,951 Mortgage-backed securities 1 1,116,727 2,774 (11,325 ) 1,108,176 Total available-for-sale 2,422,802 24,960 (22,285 ) 2,425,477 Held-to-maturity State and local governments 675,674 21,400 (7,985 ) 689,089 Total held-to-maturity 675,674 21,400 (7,985 ) 689,089 Total investment securities $ 3,098,476 46,360 (30,270 ) 3,114,566 December 31, 2015 Amortized Cost Gross Unrealized Fair Value (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 47,868 15 (432 ) 47,451 U.S. government sponsored enterprises 93,230 100 (163 ) 93,167 State and local governments 856,738 34,159 (5,878 ) 885,019 Corporate bonds 386,629 611 (3,077 ) 384,163 Mortgage-backed securities 1 1,203,548 6,180 (8,768 ) 1,200,960 Total available-for-sale 2,588,013 41,065 (18,318 ) 2,610,760 Held-to-maturity State and local governments 702,072 31,863 (4,422 ) 729,513 Total held-to-maturity 702,072 31,863 (4,422 ) 729,513 Total investment securities $ 3,290,085 72,928 (22,740 ) 3,340,273 ________ 1 Consists of residential mortgage-backed securities with fair values of $1,011,252,000 and $1,200,503,000 at December 31, 2016 and 2015 , respectively, and commercial mortgage-backed securities, with fair values of $96,924,000 and $457,000 at December 31, 2016 and 2015 , respectively. Note 2. Investment Securities (continued) The following table presents the amortized cost and fair value of available-for-sale and held-to-maturity securities by contractual maturity at December 31, 2016 . Actual maturities may differ from expected or contractual maturities since issuers have the right to prepay obligations with or without prepayment penalties. December 31, 2016 Available-for-Sale Held-to-Maturity (Dollars in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 149,379 149,650 — — Due after one year through five years 437,896 438,650 594 597 Due after five years through ten years 197,462 200,654 55,310 56,048 Due after ten years 521,338 528,347 619,770 632,444 1,306,075 1,317,301 675,674 689,089 Mortgage-backed securities 1 1,116,727 1,108,176 — — Total $ 2,422,802 2,425,477 675,674 689,089 ________ 1 Mortgage-backed securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Proceeds from sales and calls of investment securities and the associated gains and losses that have been included in earnings are listed below: Years ended (Dollars in thousands) December 31, December 31, December 31, Available-for-sale Proceeds from sales and calls of investment securities $ 212,140 167,660 219,849 Gross realized gains 1 2,459 1,877 501 Gross realized losses 1 (3,794 ) (1,808 ) (705 ) Held-to-maturity Proceeds from calls of investment securities 25,405 20,997 8,930 Gross realized gains 1 97 50 22 Gross realized losses 1 (225 ) (100 ) (6 ) __________ 1 The gain or loss on the sale or call of each investment security is determined by the specific identification method. At December 31, 2016 and 2015 , the Company had investment securities with carrying values of $1,878,739,000 and $1,824,819,000 , respectively, pledged as collateral for FHLB advances, FRB discount window borrowings, securities sold under agreements to repurchase (“repurchase agreements”), interest rate swap agreements and deposits of several local government units. Note 2. Investment Securities (continued) Investment securities with an unrealized loss position are summarized as follows: December 31, 2016 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Available-for-sale U.S. government and federal agency $ 6,718 (24 ) 26,239 (138 ) 32,957 (162 ) U.S. government sponsored enterprises 6,049 (42 ) — — 6,049 (42 ) State and local governments 222,700 (4,949 ) 81,783 (5,014 ) 304,483 (9,963 ) Corporate bonds 174,821 (774 ) 6,141 (19 ) 180,962 (793 ) Mortgage-backed securities 778,109 (10,657 ) 29,957 (668 ) 808,066 (11,325 ) Total available-for-sale $ 1,188,397 (16,446 ) 144,120 (5,839 ) 1,332,517 (22,285 ) Held-to-maturity State and local governments $ 117,912 (1,712 ) 86,601 (6,273 ) 204,513 (7,985 ) Total held-to-maturity $ 117,912 (1,712 ) 86,601 (6,273 ) 204,513 (7,985 ) December 31, 2015 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Available-for-sale U.S. government and federal agency $ 42,493 (432 ) 2 — 42,495 (432 ) U.S. government sponsored enterprises 60,010 (163 ) — — 60,010 (163 ) State and local governments 102,422 (1,629 ) 115,943 (4,249 ) 218,365 (5,878 ) Corporate bonds 228,258 (1,812 ) 13,962 (1,265 ) 242,220 (3,077 ) Mortgage-backed securities 730,412 (7,226 ) 53,021 (1,542 ) 783,433 (8,768 ) Total available-for-sale $ 1,163,595 (11,262 ) 182,928 (7,056 ) 1,346,523 (18,318 ) Held-to-maturity State and local governments $ 42,322 (594 ) 81,709 (3,828 ) 124,031 (4,422 ) Total held-to-maturity $ 42,322 (594 ) 81,709 (3,828 ) 124,031 (4,422 ) Based on an analysis of its investment securities with unrealized losses as of December 31, 2016 and 2015 , the Company determined that none of such securities had other-than-temporary impairment and the unrealized losses were primarily the result of interest rate changes and market spreads subsequent to acquisition. The fair value of the investment securities is expected to recover as payments are received and the securities approach maturity. At December 31, 2016 , management determined that it did not intend to sell investment securities with unrealized losses, and there was no expected requirement to sell any of its investment securities with unrealized losses before recovery of their amortized cost.

Loans Receivable, Net

Loans Receivable, Net	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Loans Receivable, Net	Loans Receivable, Net The Company’s loan portfolio is comprised of three segments: residential real estate, commercial, and consumer and other loans. The loan segments are further disaggregated into the following classes: residential real estate, commercial real estate, other commercial, home equity and other consumer loans. The following table presents loans receivable for each portfolio class of loans: At or for the Year ended (Dollars in thousands) December 31, December 31, Residential real estate loans $ 674,347 688,912 Commercial loans Real estate 2,990,141 2,633,953 Other commercial 1,342,250 1,099,564 Total 4,332,391 3,733,517 Consumer and other loans Home equity 434,774 420,901 Other consumer 242,951 235,351 Total 677,725 656,252 Loans receivable 1 5,684,463 5,078,681 Allowance for loan and lease losses (129,572 ) (129,697 ) Loans receivable, net $ 5,554,891 4,948,984 Weighted-average interest rate on loans (tax-equivalent) 4.77 % 4.84 % __________ 1 Includes net deferred fees, costs, premiums and discounts of $13,372,000 and $15,529,000 at December 31, 2016 and 2015 , respectively. The following tables summarize the activity in the ALLL by portfolio segment: Year ended December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 129,697 14,427 67,877 32,525 8,998 5,870 Provision for loan losses 2,333 (1,734 ) (2,686 ) 4,835 (520 ) 2,438 Charge-offs (11,496 ) (464 ) (3,082 ) (1,144 ) (1,185 ) (5,621 ) Recoveries 9,038 207 3,664 1,607 279 3,281 Balance at end of period $ 129,572 12,436 65,773 37,823 7,572 5,968 Year ended December 31, 2015 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 129,753 14,680 67,799 30,891 9,963 6,420 Provision for loan losses 2,284 640 (696 ) 3,030 (480 ) (210 ) Charge-offs (7,002 ) (985 ) (1,920 ) (2,322 ) (809 ) (966 ) Recoveries 4,662 92 2,694 926 324 626 Balance at end of period $ 129,697 14,427 67,877 32,525 8,998 5,870 Note 3. Loans Receivable, Net (continued) Year ended December 31, 2014 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 130,351 14,067 70,332 28,630 9,299 8,023 Provision for loan losses 1,912 716 (2,877 ) 3,708 1,254 (889 ) Charge-offs (7,603 ) (431 ) (1,802 ) (3,058 ) (1,038 ) (1,274 ) Recoveries 5,093 328 2,146 1,611 448 560 Balance at end of period $ 129,753 14,680 67,799 30,891 9,963 6,420 The following tables disclose the balance in the ALLL and the recorded investment in loans by portfolio segment: December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Allowance for loan and lease losses Individually evaluated for impairment $ 6,881 856 922 4,419 296 388 Collectively evaluated for impairment 122,691 11,580 64,851 33,404 7,276 5,580 Total allowance for loan and lease losses $ 129,572 12,436 65,773 37,823 7,572 5,968 Loans receivable Individually evaluated for impairment $ 130,263 11,612 85,634 23,950 5,934 3,133 Collectively evaluated for impairment 5,554,200 662,735 2,904,507 1,318,300 428,840 239,818 Total loans receivable $ 5,684,463 674,347 2,990,141 1,342,250 434,774 242,951 December 31, 2015 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Allowance for loan and lease losses Individually evaluated for impairment $ 8,124 782 1,629 5,277 64 372 Collectively evaluated for impairment 121,573 13,645 66,248 27,248 8,934 5,498 Total allowance for loan and lease losses $ 129,697 14,427 67,877 32,525 8,998 5,870 Loans receivable Individually evaluated for impairment $ 140,773 20,767 85,845 23,874 6,493 3,794 Collectively evaluated for impairment 4,937,908 668,145 2,548,108 1,075,690 414,408 231,557 Total loans receivable $ 5,078,681 688,912 2,633,953 1,099,564 420,901 235,351 Substantially all of the Company’s loans receivable are with customers in the Company’s geographic market areas. Although the Company has a diversified loan portfolio, a substantial portion of its customers’ ability to honor their obligations is dependent upon the economic performance in the Company’s market areas. The Company is subject to regulatory limits for the amount of loans to any individual borrower and the Company is in compliance with this regulation as of December 31, 2016 and 2015 . No borrower had outstanding loans or commitments exceeding 10 percent of the Company’s consolidated stockholders’ equity as of December 31, 2016 . At December 31, 2016 , the Company had $3,585,328,000 in variable rate loans and $2,099,135,000 in fixed rate loans. At December 31, 2016 , the Company had loans of $3,242,380,000 pledged as collateral for FHLB advances and FRB discount window. There were no significant purchases or sales of portfolio loans during 2016 , 2015 and 2014 . Note 3. Loans Receivable, Net (continued) The Company has entered into transactions with its executive officers and directors and their affiliates. The aggregate amount of loans outstanding to such related parties at December 31, 2016 and 2015 was $58,438,000 and $53,233,000 , respectively. During 2016 , new loans to such related parties were $10,272,000 , repayments were $9,172,000 and the effect of changes in composition of related parties was $4,105,000 . In management’s opinion, such loans were made in the ordinary course of business and were made on substantially the same terms as those prevailing at the time for comparable transaction with other persons. The following tables disclose information related to impaired loans by portfolio segment: At or for the Year ended December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Loans with a specific valuation allowance Recorded balance $ 22,128 2,759 9,129 8,814 334 1,092 Unpaid principal balance 22,374 2,825 9,130 8,929 345 1,145 Specific valuation allowance 6,881 856 922 4,419 296 388 Average balance 26,745 4,942 10,441 9,840 257 1,265 Loans without a specific valuation allowance Recorded balance $ 108,135 8,853 76,505 15,136 5,600 2,041 Unpaid principal balance 131,059 9,925 94,180 17,724 7,120 2,110 Average balance 108,827 12,858 72,323 15,537 6,004 2,105 Total Recorded balance $ 130,263 11,612 85,634 23,950 5,934 3,133 Unpaid principal balance 153,433 12,750 103,310 26,653 7,465 3,255 Specific valuation allowance 6,881 856 922 4,419 296 388 Average balance 135,572 17,800 82,764 25,377 6,261 3,370 At or for the Year ended December 31, 2015 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Loans with a specific valuation allowance Recorded balance $ 34,683 8,253 12,554 11,923 102 1,851 Unpaid principal balance 36,157 9,198 12,581 12,335 109 1,934 Specific valuation allowance 8,124 782 1,629 5,277 64 372 Average balance 36,176 6,393 15,827 11,768 426 1,762 Loans without a specific valuation allowance Recorded balance $ 106,090 12,514 73,291 11,951 6,391 1,943 Unpaid principal balance 132,718 13,969 94,028 15,539 7,153 2,029 Average balance 116,356 13,615 78,684 15,479 6,350 2,228 Total Recorded balance $ 140,773 20,767 85,845 23,874 6,493 3,794 Unpaid principal balance 168,875 23,167 106,609 27,874 7,262 3,963 Specific valuation allowance 8,124 782 1,629 5,277 64 372 Average balance 152,532 20,008 94,511 27,247 6,776 3,990 Interest income recognized on impaired loans for the years ended December 31, 2016 , 2015 , and 2014 was not significant. Note 3. Loans Receivable, Net (continued) The following tables present an aging analysis of the recorded investment in loans by portfolio segment: December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Accruing loans 30-59 days past due $ 20,599 6,338 5,079 5,388 2,439 1,355 Accruing loans 60-89 days past due 5,018 1,398 754 1,352 844 670 Accruing loans 90 days or more past due 1,099 266 145 283 191 214 Non-accrual loans 49,332 4,528 30,216 8,817 5,240 531 Total past due and non-accrual loans 76,048 12,530 36,194 15,840 8,714 2,770 Current loans receivable 5,608,415 661,817 2,953,947 1,326,410 426,060 240,181 Total loans receivable $ 5,684,463 674,347 2,990,141 1,342,250 434,774 242,951 December 31, 2015 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Accruing loans 30-59 days past due $ 15,801 4,895 4,393 3,564 1,601 1,348 Accruing loans 60-89 days past due 3,612 961 1,841 286 280 244 Accruing loans 90 days or more past due 2,131 — 231 1,820 15 65 Non-accrual loans 51,133 8,073 28,819 7,691 6,022 528 Total past due and non-accrual loans 72,677 13,929 35,284 13,361 7,918 2,185 Current loans receivable 5,006,004 674,983 2,598,669 1,086,203 412,983 233,166 Total loans receivable $ 5,078,681 688,912 2,633,953 1,099,564 420,901 235,351 Interest income that would have been recorded on non-accrual loans if such loans had been current for the entire period would have been approximately $2,364,000 , $2,471,000 , and $3,005,000 for the years ended December 31, 2016 , 2015 , and 2014 , respectively. The following tables present TDRs that occurred during the periods presented and the TDRs that occurred within the previous twelve months that subsequently defaulted during the periods presented: Year ended December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer TDRs that occurred during the period Number of loans 34 — 10 21 3 — Pre-modification recorded balance $ 22,907 — 8,454 14,183 270 — Post-modification recorded balance $ 22,848 — 8,415 14,166 267 — TDRs that subsequently defaulted Number of loans 1 — — 1 — — Recorded balance $ 6 — — 6 — — Note 3. Loans Receivable, Net (continued) Year ended December 31, 2015 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer TDRs that occurred during the period Number of loans 64 3 25 22 1 13 Pre-modification recorded balance $ 22,316 2,259 8,877 10,545 137 498 Post-modification recorded balance $ 23,110 2,203 9,927 10,325 157 498 TDRs that subsequently defaulted Number of loans 7 1 1 4 — 1 Recorded balance $ 2,556 1,947 78 529 — 2 Year ended December 31, 2014 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer TDRs that occurred during the period Number of loans 51 — 18 24 6 3 Pre-modification recorded balance $ 37,781 — 21,760 12,522 3,385 114 Post-modification recorded balance $ 37,075 — 21,803 11,884 3,274 114 TDRs that subsequently defaulted Number of loans 5 — 2 1 2 — Recorded balance $ 4,453 — 927 693 2,833 — The modifications for the TDRs that occurred during the years ended December 31, 2016 , 2015 and 2014 included one or a combination of the following: an extension of the maturity date, a reduction of the interest rate or a reduction in the principal amount. In addition to the TDRs that occurred during the period provided in the preceding tables, the Company had TDRs with pre-modification loan balances of $5,331,000 , $8,893,000 and $12,674,000 for the years ended December 31, 2016 , 2015 and 2014 , respectively, for which OREO was received in full or partial satisfaction of the loans. The majority of such TDRs were in residential real estate for the year ended December 31, 2016 and in commercial real estate for the years ended December 31, 2015 and 2014 . At December 31, 2016 and 2015 , the Company had $1,770,000 and $3,253,000 , respectively, of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process. At December 31, 2016 and 2015 , the Company had $2,699,000 and $1,496,000 , respectively, of OREO secured by residential real estate properties. There were $4,785,000 and $2,803,000 of additional unfunded commitments on TDRs outstanding at December 31, 2016 and 2015 , respectively. The amount of charge-offs on TDRs during 2016 , 2015 and 2014 was $557,000 , $1,310,000 and $1,361,000 , respectively.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment Premises and equipment, net of accumulated depreciation, consist of the following: (Dollars in thousands) December 31, 2016 December 31, 2015 Land $ 29,648 30,108 Office buildings and construction in progress 173,886 187,787 Furniture, fixtures and equipment 84,559 78,803 Leasehold improvements 7,853 8,028 Accumulated depreciation (119,748 ) (110,696 ) Net premises and equipment $ 176,198 194,030 Depreciation expense for the years ended December 31, 2016 , 2015 , and 2014 was $15,294,000 , $14,365,000 , and $12,108,000 , respectively. The Company leases certain land, premises and equipment from third parties under operating and capital leases. Total rent expense for the years ended December 31, 2016 , 2015 , and 2014 was $3,255,000 , $3,137,000 , and $2,786,000 , respectively. Amortization of building capital lease assets is included in depreciation. The Company has entered into lease transactions with related parties. Rent expense with such related parties for the years ended December 31, 2016 , 2015 , and 2014 was $153,000 , $150,000 , and $146,000 , respectively. The total future minimum rental commitments required under operating and capital leases that have initial or remaining noncancelable lease terms in excess of one year at December 31, 2016 are as follows: (Dollars in thousands) Capital Leases Operating Leases Total Years ending December 31, 2017 $ 92 2,387 2,479 2018 92 2,146 2,238 2019 92 1,960 2,052 2020 92 1,548 1,640 2021 11 1,111 1,122 Thereafter — 3,905 3,905 Total minimum lease payments 379 13,057 13,436 Less: Amount representing interest 44 Present value of minimum lease payments 335 Less: Current portion of obligations under capital leases 75 Long-term portion of obligations under capital leases $ 260

Other Intangible Assets and Goo

Other Intangible Assets and Goodwill	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Other Intangible Assets and Goodwill	Other Intangible Assets and Goodwill The following table sets forth information regarding the Company’s core deposit intangibles: At or for the Years ended (Dollars in thousands) December 31, December 31, December 31, Gross carrying value $ 34,742 38,527 32,056 Accumulated amortization (22,395 ) (23,972 ) (21,156 ) Net carrying value $ 12,347 14,555 10,900 Aggregate amortization expense $ 2,970 2,964 2,811 Weighted-average amortization period 9.6 years Estimated amortization expense for the years ending December 31, 2017 $ 2,161 2018 1,718 2019 1,618 2020 1,557 2021 1,497 Core deposit intangibles increased $762,000 , $6,619,000 and $4,199,000 during 2016 , 2015 and 2014 , respectively, due to acquisitions. For additional information relating to acquisitions, see Note 22. The following table discloses the changes in the carrying value of goodwill: Years ended (Dollars in thousands) December 31, December 31, December 31, Net carrying value at beginning of period $ 140,638 129,706 129,706 Acquisitions 6,415 10,932 — Net carrying value at end of period $ 147,053 140,638 129,706 The gross carrying value of goodwill and the accumulated impairment charge consists of the following: (Dollars in thousands) December 31, December 31, Gross carrying value $ 187,212 180,797 Accumulated impairment charge 1 (40,159 ) (40,159 ) Net carrying value $ 147,053 140,638 __________ 1 A goodwill impairment charge was recognized in 2011 and was due to high levels of volatility and dislocation in bank stock prices nationwide. Note 5. Other Intangible Assets and Goodwill (continued) The Company’s first step in evaluating goodwill for possible impairment is a control premium analysis. The analysis first calculates the market capitalization and then adjusts such value for a control premium range which results in an implied fair value. The control premium range is determined based on historical control premiums for acquisitions that are comparable to the Company and is obtained from an independent third party. The calculated implied fair value is then compared to the book value to determine whether the Company needs to proceed to step two of the goodwill impairment assessment. The Company performed its annual goodwill impairment test during the third quarter of 2016 and determined the fair value of the aggregated reporting units exceeded the carrying value, such that the Company’s goodwill was not considered impaired. In recognition there were no events or circumstances that occurred during the fourth quarter of 2016 that would more-likely-than-not reduce the fair value of a reporting unit below its carrying value, the Company did not perform interim testing at December 31, 2016. Changes in the economic environment, operations of the aggregated reporting units, or other factors could result in the decline in the fair value of the aggregated reporting units which could result in a goodwill impairment in the future.

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Variable Interest Entities	Variable Interest Entities A VIE is a partnership, limited liability company, trust or other legal entity that meets one of the following criteria: 1) the entity’s equity investment at risk is not sufficient to permit the entity to finance its activities without additional subordinated financial support from other parties; 2) the holders of the equity investment at risk, as a group, lack the characteristics of a controlling financial interest; and 3) the voting rights of some holders of the equity investment at risk are disproportionate to their obligation to absorb losses or receive returns, and substantially all of the activities are conducted on behalf of the holder of equity investment at risk with disproportionately few voting rights. A VIE must be consolidated by the Company if it is deemed to be the primary beneficiary, which is the party involved with the VIE that has both: 1) the power to direct the activities of the VIE that most significantly affect the VIE’s economic performance; and 2) the obligation to absorb the losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company’s VIEs are regularly monitored to determine if any reconsideration events have occurred that could cause the primary beneficiary status to change. A previously unconsolidated VIE is consolidated when the Company becomes the primary beneficiary. A previously consolidated VIE is deconsolidated when the Company ceases to be the primary beneficiary or the entity is no longer a VIE. In February 2015, FASB amended consolidation guidance by modifying the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities and by changing how entities analyze related-party relationships and fee arrangements. As a result of this amendment, the Company determined it was no longer the primary beneficiary of its LIHTC partnerships and deconsolidated its LIHTC investments effective January 1, 2016. Due to this reevaluation event, the Company determined its LIHTC investments would qualify for the proportional amortization method and elected to adopt this accounting method. The proportional amortization method allows for the amortization of LIHTC investments to be presented as a component of income taxes. Once elected, the proportional amortization method is required for all eligible LIHTC investments. Consolidated Variable Interest Entities The Company has equity investments in Certified Development Entities (“CDE”) which have received allocations of New Markets Tax Credits (“NMTC”). The NMTC program provides federal tax incentives to investors to make investments in distressed communities and promotes economic improvements through the development of successful businesses in these communities. The NMTC is available to investors over a seven -year period and is subject to recapture if certain events occur during such period. The maximum exposure to loss in the CDEs is the amount of equity invested and credit extended by the Company. However, the Company has credit protection in the form of indemnification agreements, guarantees, and collateral arrangements. The Company has evaluated the variable interests held by the Company in each CDE (NMTC) investment and determined the Company does not individually meet the characteristics of a primary beneficiary; however, the related-party group does meet the criteria as a group and substantially all of the activities of the CDEs either involve or are conducted on behalf of the Company. As a result, the Company is the primary beneficiary of the CDEs and their assets, liabilities, and results of operations are included in the Company’s consolidated financial statements. The primary activities of the CDEs are recognized in commercial loans interest income and other borrowed funds interest expense on the Company’s statements of operations and the federal income tax credit allocations from the investments are recognized in the Company’s statements of operations as a component of income tax expense. Such related cash flows are recognized in loans originated, principal collected on loans and change in other borrowed funds. Note 6. Variable Interest Entities (continued) The following table summarizes the carrying amounts of the consolidated VIEs’ assets and liabilities included in the Company’s statements of financial condition and are adjusted for intercompany eliminations. All assets presented can be used only to settle obligations of the consolidated VIEs and all liabilities presented consist of liabilities for which creditors and other beneficial interest holders therein have no recourse to the general credit of the Company. (Dollars in thousands) December 31, December 31, Assets Loans receivable $ 36,950 57,126 Premises and equipment, net — 13,503 Accrued interest receivable 120 117 Other assets 1,984 1,429 Total assets $ 39,054 72,175 Liabilities Other borrowed funds $ 4,105 6,195 Accrued interest payable 2 9 Other liabilities 27 139 Total liabilities $ 4,134 6,343 Unconsolidated Variable Interest Entities The Company has equity investments in LIHTC partnerships with carrying values of $7,282,000 as of December 31, 2016 . The LIHTCs are indirect federal subsidies to finance low-income housing and are used in connection with both newly constructed and renovated residential rental buildings. Once a project is placed in service, it is generally eligible for the tax credit for ten consecutive years. To continue generating the tax credit and to avoid tax credit recapture, a LIHTC building must satisfy specific low-income housing compliance rules for a full fifteen -year period. The maximum exposure to loss in the VIEs is the amount of equity invested and credit extended by the Company. However, the Company has credit protection in the form of indemnification agreements, guarantees, and collateral arrangements. The Company has evaluated the variable interests held by the Company in each LIHTC investment and determined that the Company does not have controlling financial interests in such investments, and is not the primary beneficiary. The Company reports the investments in the unconsolidated LIHTCs as other assets on the Company’s statements of financial condition. Total unfunded contingent commitments related to the Company’s LIHTC investments totaled $19,933,000 at December 31, 2016 , and the Company expects to fulfill the majority of these commitments during 2017 . There were no impairment losses on the Company’s LIHTC investments during the year ended December 31, 2016 . The following table summarizes the amortization expense and the amount of tax credits and other tax benefits recognized for qualified affordable housing project investments during the periods presented. Amortization expense is recognized as a component of income tax expense. Years ended (Dollars in thousands) December 31, 2016 December 31, 2015 December 31, Amortization expense $ 1,079 1,175 1,270 Tax credits and other tax benefits recognized 436 377 419 The Company also owns the following trust subsidiaries, each of which issued trust preferred securities as Tier 1 capital instruments: Glacier Capital Trust II, Glacier Capital Trust III, Glacier Capital Trust IV, Citizens (ID) Statutory Trust I, Bank of the San Juans Bancorporation Trust I, First Company Statutory Trust 2001, and First Company Statutory Trust 2003. The trust subsidiaries have no assets, operations, revenues or cash flows other than those related to the issuance, administration and repayment of the securities held by third parties. The trust subsidiaries are not included in the Company’s consolidated financial statements because the sole asset of each trust subsidiary is a receivable from the Company, even though the Company owns all of the voting equity shares of the trust subsidiaries, has fully guaranteed the obligations of the trust subsidiaries and may have the right to redeem the third party securities under certain circumstances. The Company reports the trust preferred securities issued to the trust subsidiaries as subordinated debentures on the Company’s statements of financial condition. For additional information on the Company’s investments in trust subsidiaries, see Note 9.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Deposits	Deposits Time deposits that meet or exceed the Federal Deposit Insurance Corporation Insurance limit of $250,000 at December 31, 2016 and 2015 were $254,611,000 and $258,573,000 , respectively. The scheduled maturities of time deposits are as follows: (Dollars in thousands) Amount Years ending December 31, 2017 $ 644,881 2018 149,557 2019 69,782 2020 39,756 2021 44,159 Thereafter 579 $ 948,714 The Company reclassified $3,618,000 and $2,966,000 of overdraft demand deposits to loans as of December 31, 2016 and 2015 , respectively. The Company has entered into deposit transactions with its executive officers, directors and their affiliates. The aggregate amount of deposits with such related parties at December 31, 2016 and 2015 was $27,977,000 and $21,818,000 , respectively.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Borrowings	Borrowings The Company’s repurchase agreements totaled $473,650,000 and $423,414,000 at December 31, 2016 and 2015 , respectively, and are secured by investment securities with carrying values of $472,239,000 and $446,838,000 , respectively. Securities are pledged to customers at the time of the transaction in an amount at least equal to the outstanding balance and are held in custody accounts by third parties. The fair value of collateral is continually monitored and additional collateral is provided as deemed appropriate. The following tables summarize the carrying value of the Company’s repurchase agreements by remaining contractual maturity and category of collateral: December 31, 2016 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total Mortgage-backed securities $ 473,007 643 473,650 December 31, 2015 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total U.S. government sponsored enterprises $ 12,507 — 12,507 Mortgage-backed securities 408,460 2,447 410,907 Total $ 420,967 2,447 423,414 Note 8. Borrowings (continued) The Company’s FHLB advances bear a fixed rate of interest and are subject to restrictions or penalties in the event of prepayment. The advances are collateralized by specifically pledged loans and investment securities, FHLB stock owned by the Company, and a blanket assignment of the unpledged qualifying loans and investments. The scheduled maturities of FHLB advances consist of the following: December 31, 2016 December 31, 2015 (Dollars in thousands) Amount Weighted Rate Amount Weighted Rate Maturing within one year $ 41,099 0.84 % $ 185,091 1.02 % Maturing one year through two years 70,983 1.42 % 179 4.19 % Maturing two years through three years 927 2.16 % 70,597 1.01 % Maturing three years through four years 1,728 3.66 % 167 3.79 % Maturing four years through five years 135,000 3.08 % 945 4.98 % Thereafter 2,012 5.33 % 137,152 3.12 % Total $ 251,749 2.27 % $ 394,131 1.76 % With respect to $155,000,000 of FHLB advances at December 31, 2016 , FHLB holds put options that will be exercised on the quarterly measurement date when 3-month LIBOR is 8 percent or greater. The FHLB put option maturities range from 2018 to 2021 and the interest rates range from 2.73 percent to 3.43 percent . The Company’s remaining borrowings consisted of capital lease obligations and other debt obligations through consolidation of certain VIEs. At December 31, 2016 , the Company had $255,000,000 in unsecured lines of credit which are typically renewed on an annual basis with various correspondent entities.

Subordinated Debentures

Subordinated Debentures	12 Months Ended
	Dec. 31, 2016
Debt Instruments [Abstract]
Subordinated Debentures	Subordinated Debentures Trust preferred securities were issued by the Company’s trust subsidiaries, the common stock of which is wholly-owned by the Company, in conjunction with the Company issuing subordinated debentures to the trust subsidiaries. The terms of the subordinated debentures are the same as the terms of the trust preferred securities. The Company guaranteed the payment of distributions and payments for redemption or liquidation of the trust preferred securities to the extent of funds held by the trust subsidiaries. The obligations of the Company under the subordinated debentures together with the guarantee and other back-up obligations, in the aggregate, constitute a full and unconditional guarantee by the Company of the obligations of all trusts under the trust preferred securities. The trust preferred securities are subject to mandatory redemption upon repayment of the subordinated debentures at their stated maturity date or the earlier redemption in an amount equal to their liquidation amount plus accumulated and unpaid distributions to the date of redemption. Interest distributions are payable quarterly. The Company may defer the payment of interest at any time for a period not exceeding 20 consecutive quarters provided that the deferral period does not extend past the stated maturity. During any such deferral period, distributions on the trust preferred securities will also be deferred and the Company’s ability to pay dividends on its common shares will be restricted. Subject to prior approval by the FRB, the trust preferred securities may be redeemed at par prior to maturity at the Company’s option on or after the redemption date. All of the Company’s trust preferred securities have reached the redemption date and could be redeemed at the Company’s option. The trust preferred securities may also be redeemed at any time in whole (but not in part) for the Trusts in the event of unfavorable changes in laws or regulations that result in 1) subsidiary trusts becoming subject to federal income tax on income received on the subordinated debentures; 2) interest payable by the Company on the subordinated debentures becoming non-deductible for federal tax purposes; 3) the requirement for the trusts to register under the Investment Company Act of 1940, as amended; or 4) loss of the ability to treat the trust preferred securities as Tier 1 capital under the FRB capital adequacy guidelines. For regulatory capital purposes, the FRB has allowed bank holding companies to continue to include trust preferred securities in Tier 1 capital up to a certain limit. Provisions of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (“Dodd-Frank Act”) require the FRB to exclude trust preferred securities from Tier 1 capital, but a permanent grandfather provision applicable to the Company permits bank holding companies with consolidated assets of less than $15 billion to continue counting existing trust preferred securities as Tier 1 capital until they mature, even after the Company’s total assets exceed $15 billion . All of the Company’s trust preferred securities qualified as Tier 1 capital instruments at December 31, 2016 . For additional information on regulatory capital, see Note 11. Note 9. Subordinated Debentures (continued) The terms of the subordinated debentures, arranged by maturity date, are reflected in the table below. The amounts include fair value adjustments from acquisitions. December 31, 2016 Variable Rate Structure Maturity Date (Dollars in thousands) Balance Rate First Company Statutory Trust 2001 $ 3,207 4.187 % 3 mo LIBOR plus 3.30% 07/31/2031 First Company Statutory Trust 2003 2,361 4.247 % 3 mo LIBOR plus 3.25% 03/26/2033 Glacier Capital Trust II 46,393 3.630 % 3 mo LIBOR plus 2.75% 04/07/2034 Citizens (ID) Statutory Trust I 5,155 3.643 % 3 mo LIBOR plus 2.65% 06/17/2034 Glacier Capital Trust III 36,083 2.170 % 3 mo LIBOR plus 1.29% 04/07/2036 Glacier Capital Trust IV 30,928 2.533 % 3 mo LIBOR plus 1.57% 09/15/2036 Bank of the San Juans Bancorporation Trust I 1,864 2.751 % 3 mo LIBOR plus 1.82% 03/01/2037 $ 125,991

Derivatives and Hedging Activit

Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities The Company is exposed to certain risk relating to its ongoing business operations. The primary risk managed by using derivative instruments is interest rate risk. Interest rate swaps are entered into to manage interest rate risk associated with the Company’s forecasted variable rate borrowings. The Company recognizes interest rate swaps as either assets or liabilities at fair value in the statements of financial condition, after taking into account the effects of bilateral collateral and master netting agreements. These agreements allow the Company to settle all interest rate swap agreements held with a single counterparty on a net basis, and to offset net interest rate swap derivative positions with related collateral, where applicable. The interest rate swaps on variable rate borrowings were designated as cash flow hedges and were over-the-counter contracts. The contracts were entered into by the Company with a single counterparty, and the specific terms and conditions were negotiated, including forecasted notional amounts, interest rates and maturity dates. The Company is exposed to credit-related losses in the event of nonperformance by the counterparty to the agreements. The Company controls the counterparty credit risk by maintaining bilateral collateral agreements and through monitoring policy and procedures. The Company only conducts business with primary dealers and believes that the credit risk inherent in these contracts was not significant. The Company’s interest rate swap derivative financial instruments as of December 31, 2016 are as follows: (Dollars in thousands) Forecasted Notional Amount Variable Interest Rate 1 Fixed Interest Rate 1 Payment Term Interest rate swap $ 160,000 3 month LIBOR 3.378 % Oct. 21, 2014 - Oct. 21, 2021 Interest rate swap 100,000 3 month LIBOR 2.498 % Nov. 30, 2015 - Nov. 30, 2022 __________ 1 The Company pays the fixed interest rate and the counterparty pays the Company the variable interest rate. The hedging strategy converts the LIBOR-based variable interest rate on borrowings to a fixed interest rate, thereby protecting the Company from interest rate variability. The interest rate swaps with the $160,000,000 and $100,000,000 notional amounts began their payment terms in October 2014 and November 2015, respectively. The Company designated wholesale deposits as the cash flow hedge and these deposits were determined to be fully effective during the current and prior year. As such, no amount of ineffectiveness has been included in the Company’s statements of operations for the years ended December 31, 2016 , 2015 and 2014 . Therefore, the aggregate fair value of the interest rate swaps was recorded in other liabilities with changes recorded in other comprehensive income. The Company expects the hedges to remain highly effective during the remaining terms of the interest rate swaps. Interest expense recorded on the interest rate swaps totaled $8,035,000 , $5,695,000 and $1,066,000 during 2016 , 2015 and 2014 , respectively, and is reported as a component of interest expense on deposits. Unless the interest rate swaps are terminated during the next year, the Company expects $5,558,000 of the unrealized loss reported in other comprehensive income at December 31, 2016 to be reclassified to interest expense during the next twelve months. Note 10. Derivatives and Hedging Activities (continued) The following table presents the pre-tax gains or losses recorded in accumulated other comprehensive income and the Company’s statements of operations relating to the interest rate swap derivative financial instruments: Years ended (Dollars in thousands) December 31, December 31, December 31, Interest rate swaps Amount of gain (loss) recognized in OCI (effective portion) $ (1,643 ) (7,857 ) (19,557 ) Amount of loss reclassified from OCI to interest expense (6,417 ) (5,025 ) (993 ) Amount of loss recognized in other non-interest expense (ineffective portion) — — — The following table discloses the offsetting of financial liabilities and interest rate swap derivative liabilities. There were no interest rate swap derivative assets at the dates presented. December 31, 2016 December 31, 2015 (Dollars in thousands) Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statements of Financial Position Net Amounts of Liabilities Presented in the Statements of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statements of Financial Position Net Amounts of Liabilities Presented in the Statements of Financial Position Interest rate swaps $ 14,725 — 14,725 19,499 — 19,499 Pursuant to the interest rate swap agreements, the Company pledged collateral to the counterparty in the form of investment securities totaling $29,585,000 at December 31, 2016 . There was $0 collateral pledged from the counterparty to the Company as of December 31, 2016 . There is the possibility that the Company may need to pledge additional collateral in the future if there were declines in the fair value of the interest rate swap derivative financial instruments versus the collateral pledged.

Regulatory Capital

Regulatory Capital	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Regulatory Capital	Regulatory Capital The Federal Reserve has adopted capital adequacy guidelines that are used to assess the adequacy of capital in supervising a bank holding company. The federal banking agencies implemented final rules (“Final Rules”) to establish a new comprehensive regulatory capital framework with a phase-in period beginning on January 1, 2015 and ending on January 1, 2019. The Final Rules implemented the third installment of the Basel Accords (“Basel III”) regulatory capital reforms and changes required by the Dodd-Frank Act and substantially amended the regulatory risk-based capital rules applicable to the Company. Under Basel III, the Company must hold a conservation buffer above the adequately capitalized risk-based capital ratios. The capital conservation buffer for 2016 is 0.625% . In connection with the adoption of Basel III, the Company elected to opt-out of the requirement to include most components of accumulated other comprehensive income. As of December 31, 2016 , management believes the Company and Bank meet all capital adequacy requirements to which they are subject. Prompt corrective action regulations provide the following classifications: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized and critically undercapitalized. If undercapitalized, capital distributions (including payment of a dividend) are generally restricted, as is paying management fees to its bank holding company. Failure to meet minimum capital requirements set forth in the table below can initiate certain mandatory and possible additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s and Bank’s financial condition. The Company’s and Bank’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Note 11. Regulatory Capital (continued) At December 31, 2016 and 2015 , the most recent regulatory notifications categorized the Company and Bank as well capitalized under the regulatory framework for prompt corrective action. To be well capitalized, the Bank must maintain minimum total capital, Tier 1 capital, Common Tier 1 capital and Tier 1 Leverage ratios as set forth in the table below. There are no conditions or events since December 31, 2016 that management believes have changed the Company’s or Bank’s risk-based capital category. The following tables illustrate the FRB’s adequacy guidelines and the Company’s and the Bank’s compliance with those guidelines: December 31, 2016 Actual Required for Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Regulations (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Total capital (to risk-weighted assets) Consolidated $ 1,179,673 16.38 % $ 576,092 8.00 % N/A N/A Glacier Bank 1,131,949 15.76 % 574,658 8.00 % $ 718,323 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated $ 1,089,142 15.12 % $ 432,069 6.00 % N/A N/A Glacier Bank 1,041,640 14.50 % 430,994 6.00 % $ 574,658 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated $ 966,701 13.42 % $ 324,052 4.50 % N/A N/A Glacier 1,041,640 14.50 % 323,245 4.50 % $ 466,910 6.50 % Tier 1 capital (to average assets) Consolidated $ 1,089,142 11.90 % $ 365,994 4.00 % N/A N/A Glacier Bank 1,041,640 11.45 % 363,945 4.00 % $ 454,932 5.00 % December 31, 2015 Actual Required for Capital Adequacy Purposes To Be Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Total capital (to risk-weighted assets) Consolidated $ 1,131,460 17.17 % $ 527,160 8.00 % N/A N/A Glacier Bank 1,093,669 16.66 % 525,228 8.00 % $ 656,535 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated $ 1,048,505 15.91 % $ 395,370 6.00 % N/A N/A Glacier Bank 1,010,981 15.40 % 393,921 6.00 % $ 525,228 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated $ 926,523 14.06 % $ 296,528 4.50 % N/A N/A Glacier 1,010,981 15.40 % 295,441 4.50 % $ 426,748 6.50 % Tier 1 capital (to average assets) Consolidated $ 1,048,505 12.01 % $ 349,066 4.00 % N/A N/A Glacier Bank 1,010,981 11.66 % 346,715 4.00 % $ 433,394 5.00 % __________ N/A - Not applicable Current guidance from the Federal Reserve provides, among other things, that dividends per share on the Company’s common stock generally should not exceed earnings per share, measured over the previous four fiscal quarters. The Bank is also subject to Montana state law and cannot declare a dividend greater than the previous two years’ net earnings without providing notice to the state.

Stock-based Compensation Plan

Stock-based Compensation Plan	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation Plan	Stock-based Compensation Plan The Company has two stock-based compensation plans in effect at December 31, 2016 . The 2005 Stock Incentive Plan expired in April 2015, but still has non-vested restricted stock awards at December 31, 2016 . The 2015 Stock Incentive Plan provides incentives and awards to select employees and directors of the Company and permits the granting of stock options, share appreciation rights, restricted shares, restricted share units, unrestricted shares and performance awards. At December 31, 2016 , the number of shares available to award to employees and directors under the 2015 Stock Incentive Plan was 2,352,608 . Restricted Stock Awards The Company has awarded restricted stock to select employees and directors under the 2005 and 2015 Stock Incentive Plans. Common stock is issued as vesting restrictions lapse, which may be immediately or according to the terms of a vesting schedule. Restricted stock awards may not be sold, pledged or otherwise transferred until restrictions have lapsed. Under the 2005 Stock Incentive Plan, the recipient does not have the right to vote until the restricted stock award has vested but does have the right to receive dividends. Under the 2015 Stock Incentive Plan, the recipient does not have the right to vote or to receive dividends until the restricted stock award has vested. The fair value of the restricted stock awarded is the closing price of the Company’s common stock on the award date. Compensation expense related to restricted stock awards for the years ended December 31, 2016 , 2015 and 2014 was $2,870,000 , $2,470,000 and $1,603,000 , respectively, and the recognized income tax benefit related to this expense was $1,112,000 , $957,000 and $622,000 . As of December 31, 2016 , total unrecognized compensation expense of $3,174,000 related to restricted stock awards is expected to be recognized over a weighted-average period of 1.9 years . The fair value of restricted stock awards that vested during the years ended December 31, 2016 , 2015 and 2014 was $2,624,000 , $1,761,000 and $953,000 , respectively, and the income tax benefit related to these awards was $1,053,000 , $795,000 and $532,000 , respectively. Upon vesting of restricted stock awards, the shares are issued from the Company’s authorized stock balance. The following table summarizes the restricted stock award activity for the year ended December 31, 2016 : Restricted Stock Weighted- Average Grant Date Fair Value Non-vested at December 31, 2015 205,989 $ 24.24 Granted 134,329 23.38 Vested (115,070 ) 22.80 Forfeited (2,516 ) 24.52 Non-vested at December 31, 2016 222,732 24.46 The average remaining contractual term on non-vested restricted stock awards at December 31, 2016 is eleven months . The aggregate intrinsic value of the non-vested restricted stock awards at December 31, 2016 was $8,070,000 .

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company provides its qualified employees with a comprehensive benefit program, including health, dental and vision insurance, life and accident insurance, long-term disability coverage, vacation and sick leave, 401(k) plan, profit sharing plan, stock-based compensation plan, deferred compensation plans, and supplemental executive retirement plan. The Company has elected to self-insure certain costs related to employee health, dental and vision benefit programs. Costs resulting from noninsured losses are expensed as incurred. The Company has purchased insurance that limits its exposure on an individual claim basis for the employee health benefit programs. 401(k) Plan and Profit Sharing Plan The Company’s 401(k) plan and profit sharing plan have safe harbor and employer discretionary components. To be considered eligible for the 401(k) and safe harbor components of the profit sharing plan, an employee must be 21 years of age and employed for three full months. Employees are eligible to participate in the 401(k) plan the first day of the month once they have met the eligibility requirements. To be considered eligible for the employer discretionary contribution of the profit sharing plan, an employee must be 21 years of age, worked one full calendar quarter, worked 501 hours in the plan year and be employed as of the last day of the plan year. Participants are at all times fully vested in all contributions. The profit sharing plan contributions consists of a 3 percent non-elective safe harbor contribution fully funded by the Company and an employer discretionary contribution. The employer discretionary contribution depends on the Company’s profitability. The total profit sharing plan expense for the years ended December 31, 2016 , 2015 , and 2014 was $9,041,000 , $8,017,000 and $7,107,000 respectively. The 401(k) plan allows eligible employees to contribute up to 60 percent of their eligible annual compensation up to the limit set annually by the Internal Revenue Service (“IRS”). The Company matches an amount equal to 50 percent of the first 6 percent of an employee’s contribution. The Company’s contribution to the 401(k) for the years ended December 31, 2016 , 2015 and 2014 was $2,946,000 , $2,629,000 , and $2,246,000 , respectively. Deferred Compensation Plans The Company has non-funded deferred compensation plans for directors, senior officers and certain nonemployee service providers. The plans provide for participants’ elective deferral of cash payments of up to 50 percent of a participants’ salary and 100 percent of bonuses and directors fees. The total amount deferred for the plans was $967,000 , $720,000 , and $591,000 , for the years ending December 31, 2016 , 2015 , and 2014 , respectively. The participant receives an earnings credit at a rate equal to 50 percent of the Company’s return on average equity. The total earnings for the years ended December 31, 2016 , 2015 , and 2014 for the plans was $431,000 , $386,000 and $369,000 , respectively. In connection with several acquisitions, the Company assumed the obligations of deferred compensation plans for certain key employees. As of December 31, 2016 and 2015 , the liability related to the obligations was $11,273,000 and $11,971,000 , respectively, and was included in other liabilities. The total earnings for the years ended December 31, 2016 , 2015 , and 2014 for the acquired plans was insignificant. Supplemental Executive Retirement Plan The Company has a Supplemental Executive Retirement Plan (“SERP”) which is intended to supplement payments due to participants upon retirement under the Company’s other qualified plans. The Company credits the participant’s account on an annual basis for an amount equal to employer contributions that would have otherwise been allocated to the participant’s account under the tax-qualified plans were it not for limitations imposed by the IRS or the participation in the non-funded deferred compensation plan. Eligible employees include participants of the non-funded deferred compensation plan and employees whose benefits were limited as a result of IRS regulations. The Company’s required contribution to the SERP for the years ended December 31, 2016 , 2015 and 2014 was $299,000 , $224,000 , and $151,000 , respectively. The participant receives an earnings credit at a rate equal to 50 percent of the Company’s return on average equity. The total earnings for the years ended December 31, 2016 , 2015 , and 2014 for this plan was $85,000 , $69,000 , and $59,000 , respectively.

Other Expenses

Other Expenses	12 Months Ended
	Dec. 31, 2016
Other Expenses [Abstract]
Other Expenses	Other Expenses Other expenses consists of the following: Years ended (Dollars in thousands) December 31, December 31, December 31, Debit card expenses $ 8,479 6,153 5,802 Consulting and outside services 6,080 5,525 4,179 Telephone 3,867 3,353 2,911 Loan expenses 3,611 2,824 2,513 Employee expenses 3,611 2,508 2,156 Checking and operating expenses 2,942 3,554 3,517 Printing and supplies 2,807 3,530 3,547 Postage 2,789 3,716 3,391 VIE write-downs and other expenses 2,702 4,528 4,231 Business development 1,847 1,526 1,401 Accounting and audit fees 1,674 1,401 1,393 Legal fees 1,391 1,082 1,455 ATM expenses 900 1,082 1,268 Other 4,460 3,983 3,884 Total other expenses $ 47,160 44,765 41,648

Federal and State Income Taxes

Federal and State Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal and State Income Taxes	Federal and State Income Taxes The following table is a summary of consolidated income tax expense: Years ended (Dollars in thousands) December 31, December 31, December 31, Current Federal $ 30,461 28,705 21,860 State 9,283 9,374 8,118 Total current income tax expense 39,744 38,079 29,978 Deferred 1 Federal (70 ) (3,451 ) 5,016 State (12 ) (629 ) 915 Total deferred income tax (benefit) expense (82 ) (4,080 ) 5,931 Total income tax expense $ 39,662 33,999 35,909 __________ 1 Includes tax benefit of operating loss carryforwards of $571,000 , $391,000 and $0 for the years ended December 31, 2016 , 2015 , and 2014 , respectively. Note 15. Federal and State Income Taxes (continued) Combined federal and state income tax expense differs from that computed at the federal statutory corporate tax rate as follows: Years ended December 31, December 31, December 31, Federal statutory rate 35.0 % 35.0 % 35.0 % State taxes, net of federal income tax benefit 3.8 % 3.7 % 4.0 % Tax-exempt interest income (12.2 )% (12.6 )% (11.5 )% Tax credits (2.1 )% (3.0 )% (2.8 )% Other, net 0.2 % (0.5 )% (0.5 )% Effective tax rate 24.7 % 22.6 % 24.2 % The tax effect of temporary differences which give rise to a significant portion of deferred tax assets and deferred tax liabilities are as follows: (Dollars in thousands) December 31, December 31, Deferred tax assets Allowance for loan and lease losses $ 50,172 50,123 Deferred compensation 8,320 8,166 Other real estate owned 8,309 8,380 Interest rate swap agreements 5,705 7,554 Acquisition fair market value adjustments 4,763 5,842 Net operating loss carryforwards 4,737 3,590 Employee benefits 3,927 3,165 Other 5,569 5,433 Total gross deferred tax assets 91,502 92,253 Deferred tax liabilities Deferred loan costs (8,061 ) (7,427 ) Intangibles (5,477 ) (6,272 ) FHLB stock dividends (3,976 ) (4,601 ) Depreciation of premises and equipment (3,111 ) (2,376 ) Available-for-sale securities (1,036 ) (8,812 ) Other (2,720 ) (4,290 ) Total gross deferred tax liabilities (24,381 ) (33,778 ) Net deferred tax asset $ 67,121 58,475 The Company has federal net operating loss carryforwards of $11,934,000 expiring between 2030 and 2035 . The Company has Colorado net operating loss carryforwards of $14,986,000 expiring between 2031 and 2032 . The net operating loss carryforwards originated from bank acquisitions. The Company has federal tax credit carryforwards with no expiration dates of $411,000 . Note 15. Federal and State Income Taxes (continued) The Company and the Bank file consolidated income tax returns in the following jurisdictions: federal, Montana, Idaho, Colorado and Utah. Although the Bank has operations in Wyoming and Washington, neither Wyoming nor Washington imposes a corporate-level income tax. All required income tax returns have been timely filed. The following schedule summarizes the years that remain subject to examination as of December 31, 2016 : Years ended December 31, Federal 2013, 2014 and 2015 Montana 2013, 2014 and 2015 Idaho 2013, 2014 and 2015 Colorado 2012, 2013, 2014 and 2015 Utah 2013, 2014 and 2015 The Company had no unrecognized income tax benefits as of December 31, 2016 and 2015 . The Company recognizes interest related to unrecognized income tax benefits in interest expense and penalties are recognized in other expense. Interest expense and penalties recognized with respect to income tax liabilities for the years ended December 31, 2016 , 2015 , and 2014 was not significant. The Company had no accrued liabilities for the payment of interest or penalties at December 31, 2016 and 2015 . The Company has assessed the need for a valuation allowance and determined that a valuation allowance was not necessary at December 31, 2016 and 2015 . The Company believes that it is more-likely-than-not that the Company’s deferred tax assets will be realizable by offsetting future taxable income from reversing taxable temporary differences and anticipated future taxable income (exclusive of reversing temporary differences). In its assessment, the Company considered its strong earnings history, no history of income tax credit carryforwards expiring unused, and no future net operating losses (for tax purposes) are expected. Retained earnings at December 31, 2016 includes $3,600,000 for which no provision for federal income tax has been made. This amount represents the base year reserve for bad debts, which is essentially an allocation of earnings to pre-1988 bad debt deductions for federal income tax purposes only. This amount is treated as a permanent difference and deferred taxes are not recognized unless it appears that this bad debt reserve will be reduced and thereby result in taxable income in the foreseeable future. The Company is not currently contemplating any changes in its business or operations which would result in a recapture of this reserve for bad debts for federal income tax purposes.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table illustrates the activity within accumulated other comprehensive income by component, net of tax: (Dollars in thousands) Gains on Available-For-Sale Securities Losses on Derivatives Used for Cash Flow Hedges Total Balance at December 31, 2013 $ 8,485 1,160 9,645 Other comprehensive income (loss) before reclassifications 19,335 (11,969 ) 7,366 Amounts reclassified from accumulated other comprehensive income 125 608 733 Net current period other comprehensive income (loss) 19,460 (11,361 ) 8,099 Balance at December 31, 2014 $ 27,945 (10,201 ) 17,744 Other comprehensive loss before reclassifications (13,968 ) (4,823 ) (18,791 ) Amounts reclassified from accumulated other comprehensive income (42 ) 3,078 3,036 Net current period other comprehensive loss (14,010 ) (1,745 ) (15,755 ) Balance at December 31, 2015 $ 13,935 (11,946 ) 1,989 Other comprehensive loss before reclassifications (13,113 ) (1,006 ) (14,119 ) Amounts reclassified from accumulated other comprehensive income 817 3,931 4,748 Net current period other comprehensive (loss) income (12,296 ) 2,925 (9,371 ) Balance at December 31, 2016 $ 1,639 (9,021 ) (7,382 )

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding during the period presented. Diluted earnings per share is computed by including the net increase in shares as if dilutive outstanding restricted stock awards were vested, using the treasury stock method. Basic and diluted earnings per share has been computed based on the following: Years ended (Dollars in thousands, except per share data) December 31, December 31, December 31, Net income available to common stockholders, basic and diluted $ 121,131 116,127 112,755 Average outstanding shares - basic 76,278,463 75,542,455 74,641,957 Add: dilutive restricted stock awards 63,373 53,126 45,358 Average outstanding shares - diluted 76,341,836 75,595,581 74,687,315 Basic earnings per share $ 1.59 1.54 1.51 Diluted earnings per share $ 1.59 1.54 1.51 There were no restricted stock awards excluded from the diluted average outstanding share calculation for the years ended December 31, 2016 , 2015 , and 2014 . Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock award exceeds the market price of the Company’s stock.

Parent Holding Company Informat

Parent Holding Company Information (Condensed)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Holding Company Information (Condensed)	Parent Holding Company Information (Condensed) The following condensed financial information was the unconsolidated information for the parent holding company: Condensed Statements of Financial Condition (Dollars in thousands) December 31, December 31, Assets Cash on hand and in banks $ 5,906 1,854 Interest bearing cash deposits 57,700 46,808 Cash and cash equivalents 63,606 48,662 Investment securities, available-for-sale 36 65 Other assets 10,764 11,553 Investment in subsidiaries 1,201,667 1,175,844 Total assets $ 1,276,073 1,236,124 Liabilities and Stockholders’ Equity Dividends payable $ 23,137 22,893 Subordinated debentures 125,991 125,848 Other liabilities 10,076 10,733 Total liabilities 159,204 159,474 Common stock 765 761 Paid-in capital 749,107 736,368 Retained earnings 374,379 337,532 Accumulated other comprehensive (loss) income (7,382 ) 1,989 Total stockholders’ equity 1,116,869 1,076,650 Total liabilities and stockholders’ equity $ 1,276,073 1,236,124 Condensed Statements of Operations and Comprehensive Income Years ended (Dollars in thousands) December 31, December 31, December 31, Income Dividends from subsidiaries $ 108,350 109,000 78,500 Intercompany charges for services 12,248 10,562 9,283 Other income 311 196 199 Total income 120,909 119,758 87,982 Expenses Compensation and employee benefits 15,665 13,205 10,773 Other operating expenses 7,701 7,313 6,824 Total expenses 23,366 20,518 17,597 Income before income tax benefit and equity in undistributed net income of subsidiaries 97,543 99,240 70,385 Income tax benefit 4,040 3,105 2,919 Income before equity in undistributed net income of subsidiaries 101,583 102,345 73,304 Equity in undistributed net income of subsidiaries 19,548 13,782 39,451 Net Income $ 121,131 116,127 112,755 Comprehensive Income $ 111,760 100,372 120,854 Note 18. Parent Holding Company Information (Condensed) (continued) Condensed Statements of Cash Flows Years ended (Dollars in thousands) December 31, December 31, December 31, Operating Activities Net income $ 121,131 116,127 112,755 Adjustments to reconcile net income to net cash provided by operating activities: Subsidiary income in excess of dividends distributed (19,548 ) (13,782 ) (39,451 ) Excess tax benefits from stock-based compensation (8 ) (102 ) (138 ) Net change in other assets and other liabilities 507 307 140 Net cash provided by operating activities 102,082 102,550 73,306 Investing Activities Net decrease (increase) of premises and equipment 771 (1,405 ) (179 ) Net sale (purchase) of non-marketable equity securities 55 22 (667 ) Equity contributions to subsidiaries (3,475 ) (28,457 ) (18,115 ) Net cash used in by investing activities (2,649 ) (29,840 ) (18,961 ) Financing Activities Net increase in other borrowed funds 143 143 143 Cash dividends paid (84,040 ) (79,456 ) (50,944 ) Excess tax benefits from stock-based compensation 8 102 138 Stock-based compensation activity (600 ) 17 785 Net cash used in financing activities (84,489 ) (79,194 ) (49,878 ) Net increase (decrease) in cash and cash equivalents 14,944 (6,484 ) 4,467 Cash and cash equivalents at beginning of year 48,662 55,146 50,679 Cash and cash equivalents at end of year $ 63,606 48,662 55,146

Unaudited Quarterly Financial D

Unaudited Quarterly Financial Data (Condensed)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Unaudited Quarterly Financial Data (Condensed)	Unaudited Quarterly Financial Data (Condensed) Summarized unaudited quarterly financial data is as follows: Quarters ended 2016 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 84,381 86,069 85,944 87,759 Interest expense 7,675 7,424 7,318 7,214 Net interest income 76,706 78,645 78,626 80,545 Provision for loan losses 568 — 626 1,139 Net interest income after provision for loan losses 76,138 78,645 78,000 79,406 Non-interest income 24,252 26,759 28,293 28,014 Non-interest expense 62,356 64,461 65,180 66,717 Income before income taxes 38,034 40,943 41,113 40,703 Federal and state income tax expense 9,352 10,492 10,156 9,662 Net income $ 28,682 30,451 30,957 31,041 Basic earnings per share $ 0.38 0.40 0.40 0.41 Diluted earnings per share $ 0.38 0.40 0.40 0.41 Quarters ended 2015 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 77,486 78,617 80,367 83,211 Interest expense 7,382 7,369 7,309 7,215 Net interest income 70,104 71,248 73,058 75,996 Provision for loan losses 765 282 826 411 Net interest income after provision for loan losses 69,339 70,966 72,232 75,585 Non-interest income 22,693 25,802 25,799 24,467 Non-interest expense 55,497 59,945 59,112 62,203 Income before income taxes 36,535 36,823 38,919 37,849 Federal and state income tax expense 8,865 7,488 9,305 8,341 Net income $ 27,670 29,335 29,614 29,508 Basic earnings per share $ 0.37 0.39 0.39 0.39 Diluted earnings per share $ 0.37 0.39 0.39 0.39

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. There is a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The three levels of inputs that may be used to measure fair value are as follows: Level 1 Quoted prices in active markets for identical assets or liabilities Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities Transfers in and out of Level 1 (quoted prices in active markets), Level 2 (significant other observable inputs) and Level 3 (significant unobservable inputs) are recognized on the actual transfer date. There were no transfers between fair value hierarchy levels during the years ended December 31, 2016 and 2015 . Recurring Measurements The following is a description of the inputs and valuation methodologies used for assets and liabilities measured at fair value on a recurring basis, as well as the general classification of such assets and liabilities pursuant to the valuation hierarchy. There have been no significant changes in the valuation techniques during the period ended December 31, 2016 . Investment securities, available-for-sale: fair value for available-for-sale securities is estimated by obtaining quoted market prices for identical assets, where available. If such prices are not available, fair value is based on independent asset pricing services and models, the inputs of which are market-based or independently sourced market parameters, including but not limited to, yield curves, interest rates, volatilities, market spreads, prepayments, defaults, recoveries, cumulative loss projections, and cash flows. Such securities are classified in Level 2 of the valuation hierarchy. Where Level 1 or Level 2 inputs are not available, such securities are classified as Level 3 within the hierarchy. Fair value determinations of available-for-sale securities are the responsibility of the Company’s corporate accounting and treasury departments. The Company obtains fair value estimates from independent third party vendors on a monthly basis. The vendors’ pricing system methodologies, procedures and system controls are reviewed to ensure they are appropriately designed and operating effectively. The Company reviews the vendors’ inputs for fair value estimates and the recommended assignments of levels within the fair value hierarchy. The review includes the extent to which markets for investment securities are determined to have limited or no activity, or are judged to be active markets. The Company reviews the extent to which observable and unobservable inputs are used as well as the appropriateness of the underlying assumptions about risk that a market participant would use in active markets, with adjustments for limited or inactive markets. In considering the inputs to the fair value estimates, the Company places less reliance on quotes that are judged to not reflect orderly transactions, or are non-binding indications. In assessing credit risk, the Company reviews payment performance, collateral adequacy, third party research and analyses, credit rating histories and issuers’ financial statements. For those markets determined to be inactive or limited, the valuation techniques used are models for which management has verified that discount rates are appropriately adjusted to reflect illiquidity and credit risk. Interest rate swap derivative financial instruments: fair values for interest rate swap derivative financial instruments are based upon the estimated amounts to settle the contracts considering current interest rates and are calculated using discounted cash flows that are observable or that can be corroborated by observable market data and, therefore, are classified within Level 2 of the valuation hierarchy. The inputs used to determine fair value include the 3 month LIBOR forward curve to estimate variable rate cash inflows and the Fed Funds Effective Swap Rate to estimate the discount rate. The estimated variable rate cash inflows are compared to the fixed rate outflows and such difference is discounted to a present value to estimate the fair value of the interest rate swaps. The Company also obtains and compares the reasonableness of the pricing from an independent third party. Note 20. Fair Value of Assets and Liabilities (continued) The following tables disclose the fair value measurement of assets and liabilities measured at fair value on a recurring basis: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2016 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 U.S. government and federal agency $ 39,407 — 39,407 — U.S. government sponsored enterprises 19,570 — 19,570 — State and local governments 786,373 — 786,373 — Corporate bonds 471,951 — 471,951 — Mortgage-backed securities 1,108,176 — 1,108,176 — Total assets measured at fair value on a recurring basis $ 2,425,477 — 2,425,477 — Interest rate swaps $ 14,725 — 14,725 — Total liabilities measured at fair value on a recurring basis $ 14,725 — 14,725 — Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2015 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 U.S. government and federal agency $ 47,451 — 47,451 — U.S. government sponsored enterprises 93,167 — 93,167 — State and local governments 885,019 — 885,019 — Corporate bonds 384,163 — 384,163 — Mortgage-backed securities 1,200,960 — 1,200,960 — Total assets measured at fair value on a recurring basis $ 2,610,760 — 2,610,760 — Interest rate swaps $ 19,499 — 19,499 — Total liabilities measured at fair value on a recurring basis $ 19,499 — 19,499 — Non-recurring Measurements The following is a description of the inputs and valuation methodologies used for assets recorded at fair value on a non-recurring basis, as well as the general classification of such assets pursuant to the valuation hierarchy. There have been no significant changes in the valuation techniques during the period ended December 31, 2016 . Other real estate owned: OREO is carried at the lower of fair value at acquisition date or current estimated fair value, less estimated cost to sell. Estimated fair value of OREO is based on appraisals or evaluations (new or updated). OREO is classified within Level 3 of the fair value hierarchy. Note 20. Fair Value of Assets and Liabilities (continued) Collateral-dependent impaired loans, net of ALLL: loans included in the Company’s loan portfolio for which it is probable that the Company will not collect all principal and interest due according to contractual terms are considered impaired. Estimated fair value of collateral-dependent impaired loans is based on the fair value of the collateral, less estimated cost to sell. Collateral-dependent impaired loans are classified within Level 3 of the fair value hierarchy. The Company’s credit departments review appraisals for OREO and collateral-dependent loans, giving consideration to the highest and best use of the collateral. The appraisal or evaluation (new or updated) is considered the starting point for determining fair value. The valuation techniques used in preparing appraisals or evaluations (new or updated) include the cost approach, income approach, sales comparison approach, or a combination of the preceding valuation techniques. The key inputs used to determine the fair value of the collateral-dependent loans and OREO include selling costs, discounted cash flow rate or capitalization rate, and adjustment to comparables. Valuations and significant inputs obtained by independent sources are reviewed by the Company for accuracy and reasonableness. The Company also considers other factors and events in the environment that may affect the fair value. The appraisals or evaluations (new or updated) are reviewed at least quarterly and more frequently based on current market conditions, including deterioration in a borrower’s financial condition and when property values may be subject to significant volatility. After review and acceptance of the collateral appraisal or evaluation (new or updated), adjustments to the impaired loan or OREO may occur. The Company generally obtains appraisals or evaluations (new or updated) annually. The following tables disclose the fair value measurement of assets with a recorded change during the period resulting from re-measuring the assets at fair value on a non-recurring basis: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Other real estate owned $ 7,839 — — 7,839 Collateral-dependent impaired loans, net of ALLL 5,664 — — 5,664 Total assets measured at fair value on a non-recurring basis $ 13,503 — — 13,503 Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Other real estate owned $ 7,609 — — 7,609 Collateral-dependent impaired loans, net of ALLL 12,938 — — 12,938 Total assets measured at fair value on a non-recurring basis $ 20,547 — — 20,547 Note 20. Fair Value of Assets and Liabilities (continued) Non-recurring Measurements Using Significant Unobservable Inputs (Level 3) The following tables present 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 value: Fair Value Quantitative Information about Level 3 Fair Value Measurements (Dollars in thousands) December 31, Valuation Technique Unobservable Input Range (Weighted- Average) 1 Other real estate owned $ 7,767 Sales comparison approach Selling costs 6.0% - 10.0% (6.9%) Adjustment to comparables 0.0% - 10.0% (0.1%) 72 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 10.0% - 10.0% (10.0%) $ 7,839 Collateral-dependent impaired loans, net of ALLL $ 110 Cost approach Selling costs 6.0% - 20.0% (6.6%) 1,982 Sales comparison approach Selling costs 8.0% - 10.0% (9.6%) 3,572 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 20.0% - 20.0% (20.0%) $ 5,664 Fair Value Quantitative Information about Level 3 Fair Value Measurements (Dollars in thousands) December 31, Valuation Technique Unobservable Input Range (Weighted- Average) 1 Other real estate owned $ 4,067 Sales comparison approach Selling costs 7.0% - 10.0% (7.9%) 3,542 Combined approach Selling costs 8.0% - 8.0% (8.0%) $ 7,609 Collateral-dependent impaired loans, net of ALLL $ 162 Cost approach Selling costs 0.0% - 20.0% (6.1%) 9,465 Sales comparison approach Selling costs 8.0% - 20.0% (8.9%) Adjustment to comparables 0.0% - 5.0% (0.0%) 3,311 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 20.0% - 20.0% (20.0%) $ 12,938 __________ 1 The range for selling costs and adjustments to comparables indicate reductions to the fair value. Note 20. Fair Value of Assets and Liabilities (continued) Fair Value of Financial Instruments The following is a description of the methods used to estimate the fair value of all other assets and liabilities recognized at amounts other than fair value. Cash and cash equivalents: fair value is estimated at book value. Investment securities, held-to-maturity: fair value for held-to-maturity securities is estimated in the same manner as available-for-sale securities, which is described above. Loans held for sale: fair value is estimated at book value. Loans receivable, net of ALLL: fair value is estimated by discounting the future cash flows using the rates at which similar notes would be written for the same remaining maturities. The market rates used are based on current rates the Company would impose for similar loans and reflect a market participant assumption about risks associated with non-performance, illiquidity, and the structure and term of the loans along with local economic and market conditions. Estimated fair value of impaired loans is based on the fair value of the collateral, less estimated cost to sell, or the present value of the loan’s expected future cash flows (discounted at the loan’s effective interest rate). All impaired loans are classified as Level 3 and all other loans are classified as Level 2 within the valuation hierarchy. Accrued interest receivable: fair value is estimated at book value. Non-marketable equity securities: fair value is estimated at book value due to restrictions that limit the sale or transfer of such securities. Deposits: fair value of term deposits is estimated by discounting the future cash flows using rates of similar deposits with similar maturities. The market rates used were obtained from an independent third party and reviewed by the Company. The rates were the average of current rates offered by the Company’s local competitors. The estimated fair value of demand, NOW, savings, and money market deposits is the book value since rates are regularly adjusted to market rates and transactions are executed at book value daily. Therefore, such deposits are classified in Level 1 of the valuation hierarchy. Certificate accounts and wholesale deposits are classified as Level 2 within the hierarchy. Federal Home Loan Bank advances: fair value of non-callable FHLB advances is estimated by discounting the future cash flows using rates of similar advances with similar maturities. Such rates were obtained from current rates offered by FHLB. The estimated fair value of callable FHLB advances was obtained from FHLB and the model was reviewed by the Company. Securities sold under agreements to repurchase and other borrowed funds: fair value of term repurchase agreements and other term borrowings is estimated based on current repurchase rates and borrowing rates currently available to the Company for repurchases and borrowings with similar terms and maturities. The estimated fair value for overnight repurchase agreements and other borrowings is book value. Subordinated debentures: fair value of the subordinated debt is estimated by discounting the estimated future cash flows using current estimated market rates. The market rates used were averages of currently traded trust preferred securities with similar characteristics to the Company’s issuances and obtained from an independent third party. Accrued interest payable: fair value is estimated at book value. Off-balance sheet financial instruments: commitments to extend credit and letters of credit represent the principal categories of off-balance sheet financial instruments. Rates for these commitments are set at time of loan closing, such that no adjustment is necessary to reflect these commitments at market value. The Company has an insignificant amount of off-balance sheet financial instruments. Note 20. Fair Value of Assets and Liabilities (continued) The following tables present the carrying amounts, estimated fair values and the level within the fair value hierarchy of the Company’s financial instruments: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Carrying Amount December 31, 2016 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 $ 152,541 152,541 — — Investment securities, available-for-sale 2,425,477 — 2,425,477 — Investment securities, held-to-maturity 675,674 — 689,089 — Loans held for sale 72,927 72,927 — — Loans receivable, net of ALLL 5,554,891 — 5,380,286 123,382 Accrued interest receivable 45,832 45,832 — — Non-marketable equity securities 25,550 — 25,550 — Total financial assets $ 8,952,892 271,300 8,520,402 123,382 Financial liabilities Deposits $ 7,372,279 6,090,879 1,283,532 — FHLB advances 251,749 — 257,643 — Repurchase agreements and other borrowed funds 478,090 — 478,090 — Subordinated debentures 125,991 — 85,557 — Accrued interest payable 3,584 3,584 — — Interest rate swaps 14,725 — 14,725 — Total financial liabilities $ 8,246,418 6,094,463 2,119,547 — Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Carrying Amount December 31, 2015 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 $ 193,253 193,253 — — Investment securities, available-for-sale 2,610,760 — 2,610,760 — Investment securities, held-to-maturity 702,072 — 729,513 — Loans held for sale 56,514 56,514 — — Loans receivable, net of ALLL 4,948,984 — 4,851,934 132,649 Accrued interest receivable 44,524 44,524 — — Non-marketable equity securities 27,495 — 27,495 — Total financial assets $ 8,583,602 294,291 8,219,702 132,649 Financial liabilities Deposits $ 6,945,008 5,654,638 1,293,506 — FHLB advances 394,131 — 401,530 — Repurchase agreements and other borrowed funds 430,016 — 430,016 — Subordinated debentures 125,848 — 81,840 — Accrued interest payable 3,517 3,517 — — Interest rate swaps 19,499 — 19,499 — Total financial liabilities $ 7,918,019 5,658,155 2,226,391 —

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Contingencies and Commitments 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 letters of credit, and involve, to varying degrees, elements of credit risk. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. The Company had the following outstanding commitments: (Dollars in thousands) December 31, December 31, Commitments to extend credit $ 1,325,236 1,240,923 Letters of credit 26,162 22,415 Total outstanding commitments $ 1,351,398 1,263,338 The Company is a defendant in legal proceedings arising in the normal course of business. In the opinion of management, the disposition of pending litigation will not have a material affect on the Company’s consolidated financial position, results of operations or liquidity.

Mergers and Acquisitions

Mergers and Acquisitions	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Mergers and Acquisitions	Mergers and Acquisitions On August 31, 2016, the Company acquired 100 percent of the outstanding common stock of Treasure State Bank, a community bank based in Missoula, Montana. TSB provides banking services to individuals and businesses in the greater Missoula market. TSB has merged into Glacier Bank and has become a part of the First Security Bank of Missoula bank division. The TSB acquisition was valued at $13,940,000 and resulted in the Company issuing 349,545 shares of its common stock and $3,475,000 in cash in exchange for all of TSB’s outstanding common stock shares. The fair value of the Company shares issued was determined on the basis of the closing market price of the Company’s common stock on the August 31, 2016 acquisition date. The excess of the fair value of consideration transferred over total identifiable net assets was recorded as goodwill. The goodwill arising from the acquisition consists largely of the synergies and economies of scale expected from combining the operations of the Company and TSB. None of the goodwill is deductible for income tax purposes as the acquisition was accounted for as a tax-free exchange. On October 31, 2015, the Company acquired 100 percent of the outstanding common stock of Cañon Bank Corporation and its wholly-owned subsidiary, Cañon National Bank, a community bank based in Cañon City, Colorado. Cañon provides banking services to individuals and businesses in south central Colorado, with banking offices located in Colorado Springs, Pueblo, Pueblo West, Cañon City, Colorado City, and Florence, Colorado. The acquisition expands the Company’s market into south central Colorado and further diversifies the Company’s loan, customer and deposit base. The branches of Cañon have become a part of the Bank of the San Juans bank division. The Cañon acquisition was valued at $31,308,000 and resulted in the Company issuing 554,206 shares of its common stock and $16,145,000 in cash in exchange for all of Cañon’s outstanding common stock shares. The fair value of the Company shares issued was determined on the basis of the closing market price of the Company’s common stock on the October 31, 2015 acquisition date. The excess of the fair value of consideration transferred over total identifiable net assets was recorded as goodwill. The goodwill arising from the acquisition consists largely of the synergies and economies of scale expected from combining the operations of the Company and Cañon. None of the goodwill is deductible for income tax purposes as the acquisition was accounted for as a tax-free exchange. On February 28, 2015, the Company acquired 100 percent of the outstanding common stock of Montana Community Banks, Inc. and its wholly-owned subsidiary, Community Bank, Inc., a community bank based in Ronan, Montana. CB provides banking services to individuals and businesses in western Montana, with banking offices located in Missoula, Polson, Ronan and Pablo, Montana. The acquisition allowed the Company to add new markets in western Montana and complimented the Company’s presence in Missoula and Polson, Montana. The branches of CB have become a part of the Glacier Bank and First Security Bank of Missoula bank divisions. The CB acquisition was valued at $22,995,000 and resulted in the Company issuing 443,644 shares of its common stock and $12,219,000 in cash in exchange for all of CB’s outstanding common stock shares. The fair value of the Company shares issued was determined on the basis of the closing market price of the Company’s common stock on the February 28, 2015 acquisition date. The excess of the fair value of consideration transferred over total identifiable net assets was recorded as goodwill. The goodwill arising from the acquisition consists largely of the synergies and economies of scale expected from combining the operations of the Company and CB. None of the goodwill is deductible for income tax purposes as the acquisition was accounted for as a tax-free exchange. Note 22. Mergers and Acquisitions (continued) The assets and liabilities of TSB, Cañon and CB were recorded on the Company’s consolidated statements of financial condition at their estimated fair values as of the August 31, 2016, October 31, 2015 and February 28, 2015 acquisition dates, respectively, and their results of operations have been included in the Company’s consolidated statements of operations since those dates. The following table discloses the calculation of the fair value of the consideration transferred, the total identifiable net assets acquired and the resulting goodwill arising from the TSB, Cañon and CB acquisitions: TSB Cañon CB (Dollars in thousands) August 31, October 31, February 28, Fair value of consideration transferred Fair value of Company shares issued, net of equity issuance costs $ 10,465 $ 15,163 10,776 Cash consideration for outstanding shares 3,475 16,145 12,219 Contingent consideration — — — Total fair value of consideration transferred 13,940 31,308 22,995 Recognized amounts of identifiable assets acquired and liabilities assumed Identifiable assets acquired Cash and cash equivalents 10,176 17,860 31,931 Investment securities — 68,486 42,350 Loans receivable 51,875 159,759 84,689 Core deposit intangible 1 762 4,532 2,087 Accrued income and other assets 6,937 9,689 13,580 Total identifiable assets acquired 69,750 260,326 174,637 Liabilities assumed Deposits 58,364 237,326 146,820 FHLB advances and repurchase agreements 3,260 — 3,292 Accrued expenses and other liabilities 601 1,487 2,667 Total liabilities assumed 62,225 238,813 152,779 Total identifiable net assets 7,525 21,513 21,858 Goodwill recognized $ 6,415 $ 9,795 1,137 ________ 1 The core deposit intangible for each acquisition was determined to have an estimated life of 10 years . Note 22. Mergers and Acquisitions (continued) The fair value of the TSB, Cañon and CB assets acquired includes loans with fair values of $51,875,000 , $159,759,000 and $84,689,000 , respectively. The gross principal and contractual interest due under the TSB, Cañon and CB contracts is $54,819,000 , $164,568,000 and $88,817,000 , respectively. The Company evaluated the principal and contractual interest due at each of the acquisition dates and determined that insignificant amounts were not expected to be collectible. The Company incurred $456,000 of third-party acquisition-related costs in connection with the TSB acquisition during the year ended December 31, 2016 . The Company incurred $707,000 and $1,605,000 , respectively, of Cañon and CB third-party acquisition-related costs during the year ended December 31, 2015. The expenses are included in other expense in the Company's consolidated statements of operations. Total income consisting of net interest income and non-interest income of the acquired operations of TSB was approximately $1,800,000 and the net income was approximately $897,000 from August 31, 2016 to December 31, 2016 . Total income consisting of net interest income and non-interest income of the acquired operations of Cañon was approximately $2,606,000 and net income was approximately $563,000 from October 31, 2015 to December 31, 2015. Total income consisting of net interest income and non-interest income of the acquired operations of CB was approximately $7,492,000 and net income was approximately $1,808,000 from February 28, 2015 to December 31, 2015. The following unaudited pro forma summary presents consolidated information of the Company as if the TSB acquisition had occurred on January 1, 2015: Years ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income $ 424,242 392,252 Net income 120,929 116,577 The following unaudited pro forma summary presents consolidated information of the Company as if the Cañon and CB acquisition had occurred on January 1, 2014: Years ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income $ 401,140 383,387 Net income 115,613 115,899

Nature of Operations and Summ31

Nature of Operations and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General Glacier Bancorp, Inc. (“Company”) is a Montana corporation headquartered in Kalispell, Montana. The Company provides a full range of banking services to individuals and businesses in Montana, Idaho, Wyoming, Colorado, Utah and Washington through its wholly-owned bank subsidiary, Glacier Bank (“Bank”). The Company offers a wide range of banking products and services, including transaction and savings deposits, real estate, commercial, agriculture and consumer loans and mortgage origination services. The Company serves individuals, small to medium-sized businesses, community organizations and public entities. The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change include: 1) the determination of the allowance for loan and lease losses (“ALLL” or “allowance”); 2) the valuation of investment securities; 3) the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans; and 4) the evaluation of goodwill impairment. For the determination of the ALLL and real estate valuation estimates, management obtains independent appraisals (new or updated) for significant items. Estimates relating to investment valuations are obtained from independent third parties. Estimates relating to the evaluation of goodwill for impairment are determined based on internal calculations using significant independent party inputs.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements of the Company include the parent holding company and the Bank. The Bank consists of thirteen bank divisions, a treasury division and an information technology division. The treasury division includes the Bank’s investment portfolio and wholesale borrowings and the information technology division includes the Bank’s internal data processing and information technology expenses. The Bank divisions operate under separate names, management teams and advisory directors. The Company considers the Bank to be its sole operating segment as the Bank 1) engages in similar bank business activity from which it earns revenues and incurs expenses; 2) the operating results of the Bank are regularly reviewed by the Chief Executive Officer (i.e., the chief operating decision maker) who makes decisions about resources to be allocated to the Bank; and 3) financial information is available for the Bank. All significant inter-company transactions have been eliminated in consolidation. The Bank has subsidiary interests in variable interest entities (“VIE”) for which the Bank has both the power to direct the VIE’s significant activities and the obligation to absorb losses or right to receive benefits of the VIE that could potentially be significant to the VIE. These subsidiary interests are included in the Company’s consolidated financial statements. The parent holding company also owns non-bank subsidiaries that have issued trust preferred securities as Tier 1 capital instruments. The trust subsidiaries are not included in the Company’s consolidated financial statements. The Company's investments in the trust subsidiaries are included in non-marketable equity securities on the Company's statement of financial condition. In August 2016, the Company completed its acquisition of Treasure State Bank (“TSB”), a community bank based in Missoula, Montana. In October 2015, the Company completed its acquisition of Cañon Bank Corporation and its wholly-owned subsidiary, Cañon National Bank, a community bank based in Cañon City, Colorado (collectively, “Cañon”). In February 2015, the Company completed its acquisition of Montana Community Banks, Inc. and its wholly-owned subsidiary, Community Bank, Inc., a community bank based in Ronan, Montana (collectively, “CB”). In August 2014, the Company completed its acquisition of FNBR Holding Corporation and its wholly-owned subsidiary, First National Bank of the Rockies, a community bank based in Grand Junction, Colorado. The transactions were accounted for using the acquisition method, and their results of operations have been included in the Company’s consolidated financial statements as of the acquisition dates. In February 2015, the Financial Accounting Standards Board’s (“FASB”) amended consolidation guidance by modifying the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities and by changing how entities analyze related-party relationships and fee arrangements. As a result of this amendment, the Company determined it was no longer the primary beneficiary of certain partnerships related to its Low-Income Housing Tax Credit (“LIHTC”) investments and, as a result, deconsolidated these investments effective January 1, 2016. There was no material effect on the Company’s financial condition or results of operations upon adoption of this accounting guidance. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) Pending Acquisition During the fourth quarter of 2016, the Company announced the signing of a definitive agreement to acquire TFB Bancorp, Inc. and its wholly-owned subsidiary, The Foothills Bank, a community bank based in Yuma, Arizona (collectively, “Foothills”). Foothills provides banking services to individuals and businesses in Arizona, with banking offices located in Yuma, Prescott and Casa Grande, Arizona. As of December 31, 2016, Foothills had total assets of $334,792,000 , gross loans of $279,777,000 and total deposits of $282,198,000 . The acquisition is subject to required regulatory approvals and other customary conditions of closing and is expected to be completed during the second quarter of 2017. Foothills will be merged into Glacier Bank and will operate as a separate bank division under its existing name and management team.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash on hand, cash held as demand deposits at various banks and the Federal Reserve Bank (“FRB”), interest bearing deposits, federal funds sold, and liquid investments with original maturities of three months or less. The Bank is required to maintain an average reserve balance with either the FRB or in the form of cash on hand. The required reserve balance at December 31, 2016 was $4,169,000 .
Investment Securities	Investment Securities Debt securities for which the Company has the positive intent and ability to hold to maturity are classified as held-to-maturity and are carried at amortized cost. Debt and equity securities held primarily for the purpose of selling in the near term are classified as trading securities and are reported at fair market value, with unrealized gains and losses included in income. Debt and equity securities not classified as held-to-maturity or trading are classified as available-for-sale and are reported at fair value with unrealized gains and losses, net of income taxes, as a separate component of other comprehensive income. Premiums and discounts on investment securities are amortized or accreted into income using a method that approximates the interest method. The objective of the interest method is to calculate periodic interest income at a constant effective yield. The Company does not have any investment securities classified as trading securities. The Company reviews and analyzes the various risks that may be present within the investment portfolio on an ongoing basis, including market risk and credit risk. Market risk is the risk to an entity’s financial condition resulting from adverse changes in the value of its holdings arising from movements in interest rates, foreign exchange rates, equity prices or commodity prices. The Company assesses the market risk of individual securities as well as the investment portfolio as a whole. Credit risk, broadly defined, is the risk that an issuer or counterparty will fail to perform on an obligation. A security is investment grade if the issuer has an adequate capacity to meet its commitment over the expected life of the investment, i.e., the risk of default is low and full and timely repayment of interest and principal is expected. To determine investment grade status for securities, the Company conducts due diligence of the creditworthiness of the issuer or counterparty prior to acquisition and ongoing thereafter consistent with the risk characteristics of the security and the overall risk of the investment portfolio. Credit quality due diligence takes into account the extent to which a security is guaranteed by the U.S. government and other agencies of the U.S. government. The depth of the due diligence is based on the complexity of the structure, the size of the security, and takes into account material positions and specific groups of securities or stratifications for analysis and review of similar risk positions. The due diligence includes consideration of payment performance, collateral adequacy, internal analyses, third party research and analytics, external credit ratings and default statistics. For additional information relating to investment securities, see Note 2.
Temporary versus Other-Than-Temporary Impairment	Temporary versus Other-Than-Temporary Impairment The Company assesses individual securities in its investment portfolio for impairment at least on a quarterly basis, and more frequently when economic or market conditions warrant. An investment is impaired if the fair value of the security is less than its carrying value at the financial statement date. If impairment is determined to be other-than-temporary, an impairment loss is recognized by reducing the amortized cost for the credit loss portion of the impairment with a corresponding charge to earnings for a like amount. In evaluating impaired securities for other-than-temporary impairment losses, management considers 1) the severity and duration of the impairment; 2) the credit ratings of the security; and 3) the overall deal structure, including the Company’s position within the structure, the overall and near term financial performance of the issuer and underlying collateral, delinquencies, defaults, loss severities, recoveries, prepayments, cumulative loss projections, discounted cash flows and fair value estimates. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) In evaluating debt securities for other-than-temporary impairment losses, management assesses whether the Company intends to sell the security or if it is more-likely-than-not that the Company will be required to sell the debt security. In so doing, management considers contractual constraints, liquidity, capital, asset/liability management and securities portfolio objectives. If impairment is determined to be other-than-temporary and the Company does not intend to sell a debt security, and it is more-likely-than-not the Company will not be required to sell the security before recovery of its cost basis, it recognizes the credit component of an other-than-temporary impairment of a debt security in earnings and the remaining portion (noncredit portion) in other comprehensive income, net of tax. For held-to-maturity debt securities, the amount of an other-than-temporary impairment recorded in other comprehensive income for the noncredit portion of a previous other-than-temporary impairment is amortized prospectively, as an increase to the carrying amount of the security, over the remaining life of the security on the basis of the timing of future estimated cash flows of the security. If impairment is determined to be other-than-temporary and the Company intends to sell a debt security or it is more-likely-than-not the Company will be required to sell the security before recovery of its cost basis, it recognizes the entire amount of the other-than-temporary impairment in earnings. For debt securities with other-than-temporary impairment, the previous amortized cost basis less the other-than-temporary impairment recognized in earnings shall be the new amortized cost basis of the security. In subsequent periods, the Company accretes into interest income the difference between the new amortized cost basis and cash flows expected to be collected prospectively over the life of the debt security.
Loans Held for Sale	Loans Held for Sale Loans held for sale generally consist of long-term, fixed rate, conforming, single-family residential real estate loans and are carried at the lower of cost or estimated fair value in the aggregate. Net unrealized losses, if any, are recognized by charges to non-interest income. A sale is recognized when the Company surrenders control of the loan and consideration, is received in exchange. A gain is recognized in non-interest income to the extent the sales price exceeds the carrying value of the sold loan.
Loans Receivable	Loans Receivable Loans that are intended to be held-to-maturity are reported at the unpaid principal balance less net charge-offs and adjusted for deferred fees and costs on originated loans and unamortized premiums or discounts on acquired loans. Fees and costs on originated loans and premiums or discounts on acquired loans are deferred and subsequently amortized or accreted as a yield adjustment over the expected life of the loan utilizing the interest method. The objective of the interest method is to calculate periodic interest income at a constant effective yield. When a loan is paid off prior to maturity, the remaining fees and costs on originated loans and premiums or discounts on acquired loans are immediately recognized into interest income. The Company’s loan segments, which are based on the purpose of the loan, include residential real estate, commercial, and consumer loans. The Company’s loan classes, a further disaggregation of segments, include residential real estate loans (residential real estate segment), commercial real estate and other commercial loans (commercial segment), and home equity and other consumer loans (consumer segment). Loans that are thirty days or more past due based on payments received and applied to the loan are considered delinquent. Loans are designated non-accrual and the accrual of interest is discontinued when the collection of the contractual principal or interest is unlikely. A loan is typically placed on non-accrual when principal or interest is due and has remained unpaid for ninety days or more. When a loan is placed on non-accrual status, interest previously accrued but not collected is reversed against current period interest income. Subsequent payments on non-accrual loans are applied to the outstanding principal balance if doubt remains as to the ultimate collectability of the loan. Interest accruals are not resumed on partially charged-off impaired loans. For other loans on nonaccrual, interest accruals are resumed on such loans only when they are brought fully current with respect to interest and principal and when, in the judgment of management, the loans are estimated to be fully collectible as to both principal and interest. The Company considers impaired loans to be the primary credit quality indicator for monitoring the credit quality of the loan portfolio. Loans are designated impaired when, based upon current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement and, therefore, the Company has serious doubts as to the ability of such borrowers to fulfill the contractual obligation. Impaired loans include non-performing loans (i.e., non-accrual loans and accruing loans ninety days or more past due) and accruing loans under ninety days past due where it is probable payments will not be received according to the loan agreement (e.g., troubled debt restructuring). Interest income on accruing impaired loans is recognized using the interest method. The Company measures impairment on a loan-by-loan basis in the same manner for each class within the loan portfolio. An insignificant delay or shortfall in the amounts of payments would not cause a loan or lease to be considered impaired. The Company determines the significance of payment delays and shortfalls on a case-by-case basis, taking into consideration all of the facts and circumstances surrounding the loan and the borrower, including the length and reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest due. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) A restructured loan is considered a troubled debt restructuring (“TDR”) if the creditor, for economic or legal reasons related to the debtor’s financial difficulties, grants a concession to the debtor that it would not otherwise consider. The Company periodically enters into restructure agreements with borrowers whereby the loans were previously identified as TDRs. When such circumstances occur, the Company carefully evaluates the facts of the subsequent restructure to determine the appropriate accounting and under certain circumstances it may be acceptable not to account for the subsequently restructured loan as a TDR. When assessing whether a concession has been granted by the Company, any prior forgiveness on a cumulative basis is considered a continuing concession. A TDR loan is considered an impaired loan and a specific valuation allowance is established when the fair value of the collateral-dependent loan or present value of the loan’s expected future cash flows (discounted at the loan’s effective interest rate based on the original contractual rate) is lower than the carrying value of the impaired loan. The Company has made the following types of loan modifications, some of which were considered a TDR: • reduction of the stated interest rate for the remaining term of the debt; • extension of the maturity date(s) at a stated rate of interest lower than the current market rate for newly originated debt having similar risk characteristics; and • reduction of the face amount of the debt as stated in the debt agreements. The Company recognizes that while borrowers may experience deterioration in their financial condition, many continue to be creditworthy customers who have the willingness and capacity for debt repayment. In determining whether non-restructured or unimpaired loans issued to a single or related party group of borrowers should continue to accrue interest when the borrower has other loans that are impaired or are TDRs, the Company on a quarterly or more frequent basis performs an updated and comprehensive assessment of the willingness and capacity of the borrowers to timely and ultimately repay their total debt obligations, including contingent obligations. Such analysis takes into account current financial information about the borrowers and financially responsible guarantors, if any, including for example: • analysis of global, i.e., aggregate debt service for total debt obligations; • assessment of the value and security protection of collateral pledged using current market conditions and alternative market assumptions across a variety of potential future situations; and • loan structures and related covenants. For additional information relating to loans, see Note 3.
Allowance for Loan and Lease Losses	Allowance for Loan and Lease Losses Based upon management’s analysis of the Company’s loan portfolio, the balance of the ALLL is an estimate of probable credit losses known and inherent within the Bank’s loan portfolio as of the date of the consolidated financial statements. The ALLL is analyzed at the loan class level and is maintained within a range of estimated losses. Determining the adequacy of the ALLL involves a high degree of judgment and is inevitably imprecise as the risk of loss is difficult to quantify. The determination of the ALLL and the related provision for loan losses is a critical accounting estimate that involves management’s judgments about all known relevant internal and external environmental factors that affect loan losses. The balance of the ALLL is highly dependent upon management’s evaluations of borrowers’ current and prospective performance, appraisals and other variables affecting the quality of the loan portfolio. Individually significant loans and major lending areas are reviewed periodically to determine potential problems at an early date. Changes in management’s estimates and assumptions are reasonably possible and may have a material impact upon the Company’s consolidated financial statements, results of operations or capital. Risk characteristics considered in the ALLL analysis applicable to each loan class within the Company's loan portfolio are as follows: Residential Real Estate. Residential real estate loans are secured by owner-occupied 1-4 family residences. Repayment of these loans is primarily dependent on the personal income and credit rating of the borrowers. Credit risk in these loans is impacted by economic conditions within the Company’s market areas that affect the value of the property securing the loans and affect the borrowers' personal incomes. Mitigating risk factors for this loan class include a large number of borrowers, geographic dispersion of market areas and the loans are originated for relatively smaller amounts. Commercial Real Estate . Commercial real estate loans typically involve larger principal amounts, and repayment of these loans is generally dependent on the successful operation of the property securing the loan and/or the business conducted on the property securing the loan. Credit risk in these loans is impacted by the creditworthiness of a borrower, valuation of the property securing the loan and conditions within the local economies in the Company’s diverse, geographic market areas. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) Commercial . Commercial loans consist of loans to commercial customers for use in financing working capital needs, equipment purchases and business expansions. The loans in this category are repaid primarily from the cash flow of a borrower’s principal business operation. Credit risk in these loans is driven by creditworthiness of a borrower and the economic conditions that impact the cash flow stability from business operations across the Company’s diverse, geographic market areas. Home Equity . Home equity loans consist of junior lien mortgages and first and junior lien lines of credit (revolving open-end and amortizing closed-end) secured by owner-occupied 1-4 family residences. Repayment of these loans is primarily dependent on the personal income and credit rating of the borrowers. Credit risk in these loans is impacted by economic conditions within the Company’s market areas that affect the value of the residential property securing the loans and affect the borrowers' personal incomes. Mitigating risk factors for this loan class are a large number of borrowers, geographic dispersion of market areas and the loans are originated for terms that range from 10 years to 15 years. Other Consumer . The other consumer loan portfolio consists of various short-term loans such as automobile loans and loans for other personal purposes. Repayment of these loans is primarily dependent on the personal income of the borrowers. Credit risk is driven by consumer economic factors (such as unemployment and general economic conditions in the Company’s diverse, geographic market area) and the creditworthiness of a borrower. The ALLL consists of a specific valuation allowance component and a general valuation allowance component. The specific component relates to loans that are determined to be impaired and individually evaluated for impairment. The Company measures impairment on a loan-by-loan basis based on the present value of expected future cash flows discounted at the loan’s effective interest rate, except when it is determined that repayment of the loan is expected to be provided solely by the underlying collateral. For impairment based on expected future cash flows, the Company considers all information available as of a measurement date, including past events, current conditions, potential prepayments, and estimated cost to sell when such costs are expected to reduce the cash flows available to repay or otherwise satisfy the loan. For alternative ranges of cash flows, the likelihood of the possible outcomes is considered in determining the best estimate of expected future cash flows. The effective interest rate for a loan restructured in a TDR is based on the original contractual rate. For collateral-dependent loans and real estate loans for which foreclosure or a deed-in-lieu of foreclosure is probable, impairment is measured by the fair value of the collateral, less estimated cost to sell. The fair value of the collateral is determined primarily based upon appraisal or evaluation of the underlying real property value. The general valuation allowance component relates to probable credit losses inherent in the balance of the loan portfolio based on historical loss experience, adjusted for changes in trends and conditions of qualitative or environmental factors. The historical loss experience is based on the previous twelve quarters loss experience by loan class adjusted for risk characteristics in the existing loan portfolio. The same trends and conditions are evaluated for each class within the loan portfolio; however, the risk characteristics are weighted separately at the individual class level based on the Company’s judgment and experience. The changes in trends and conditions evaluated for each class within the loan portfolio include the following: • Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses; • Changes in global, national, regional, and local economic and business conditions and developments that affect the collectability of the portfolio, including the condition of various market segments; • Changes in the nature and volume of the portfolio and in the terms of loans; • Changes in experience, ability, and depth of lending management and other relevant staff; • Changes in the volume and severity of past due and nonaccrual loans; • Changes in the quality of the Company’s loan review system; • Changes in the value of underlying collateral for collateral-dependent loans; • The existence and effect of any concentrations of credit, and changes in the level of such concentrations; and • The effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the Company’s existing portfolio. The ALLL is increased by provisions for loan losses which are charged to expense. The portions of loan balances determined by management to be uncollectible are charged off as a reduction of the ALLL and recoveries of amounts previously charged off are credited as an increase to the ALLL. The Company’s charge-off policy is consistent with bank regulatory standards. Consumer loans generally are charged off when the loan becomes over 120 days delinquent. Real estate acquired as a result of foreclosure or by deed-in-lieu of foreclosure is classified as real estate owned until such time as it is sold. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) At acquisition date, the assets and liabilities of acquired banks are recorded at their estimated fair values which results in no ALLL carried over from acquired banks. Subsequent to acquisition, an allowance will be recorded on the acquired loan portfolios for further credit deterioration, if any.
Premises and Equipment	Premises and Equipment Premises and equipment are accounted for at cost less depreciation. Depreciation is computed on a straight-line method over the estimated useful lives or the term of the related lease. The estimated useful life for office buildings is 15 - 40 years and the estimated useful life for furniture, fixtures, and equipment is 3 - 10 years. Interest is capitalized for any significant building projects. For additional information relating to premises and equipment, see Note 4.
Leases	Leases The Company leases certain land, premises and equipment from third parties under operating and capital leases. The lease payments for operating lease agreements are recognized on a straight-line basis. The present value of the future minimum rental payments for capital leases is recognized as an asset when the lease is formed. Lease improvements incurred at the inception of the lease are recorded as an asset and depreciated over the initial term of the lease and lease improvements incurred subsequently are depreciated over the remaining term of the lease. For additional information relating to leases, see Note 4.
Other Real Estate Owned	Other Real Estate Owned Property acquired by foreclosure or deed-in-lieu of foreclosure is initially recorded at fair value, less estimated selling cost, at acquisition date (i.e., cost of the property). The Company is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan upon the occurrence of either the Company obtaining legal title to the property or the borrower conveying all interest in the property through a deed-in-lieu or similar agreement. Fair value is determined as the amount that could be reasonably expected in a current sale between a willing buyer and a willing seller in an orderly transaction between market participants at the measurement date. Subsequent to the initial acquisition, if the fair value of the asset, less estimated selling cost, is less than the cost of the property, a loss is recognized in other expense and the asset carrying value is reduced. Gain or loss on disposition of other real estate owned (“OREO”) is recorded in non-interest income or non-interest expense, respectively. In determining the fair value of the properties on the date of transfer and any subsequent estimated losses of net realizable value, the fair value of other real estate acquired by foreclosure or deed-in-lieu of foreclosure is determined primarily based upon appraisal or evaluation of the underlying property value.
Long-lived Assets	Long-lived Assets Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An asset is deemed impaired if the sum of the expected future cash flows is less than the carrying amount of the asset. If impaired, an impairment loss is recognized in other expense to reduce the carrying value of the asset to fair value. At December 31, 2016 and 2015 , no long-lived assets were considered materially impaired.
Business Combinations and Intangible Assets	Business Combinations and Intangible Assets Acquisition accounting requires the total purchase price to be allocated to the estimated fair values of assets acquired and liabilities assumed, including certain intangible assets. Goodwill is recorded if the purchase price exceeds the net fair value of assets acquired and a bargain purchase gain is recorded in other income if the net fair value of assets acquired exceeds the purchase price. Adjustment of the allocated purchase price may be related to fair value estimates for which all information has not been obtained of the acquired entity known or discovered during the allocation period, the period of time required to identify and measure the fair values of the assets and liabilities acquired in the business combination. The allocation period is generally limited to one year following consummation of a business combination. Core deposit intangible represents the intangible value of depositor relationships resulting from deposit liabilities assumed in acquisitions and is amortized using an accelerated method based on an estimated runoff of the related deposits. The core deposit intangible is evaluated for impairment and recoverability whenever events or changes in circumstances indicate that its carrying amount may not be recoverable, with any changes in estimated useful life accounted for prospectively over the revised remaining life. For additional information relating to core deposit intangibles, see Note 5. The Company tests goodwill for impairment at the reporting unit level annually during the third quarter. The Company has identified that each of the bank divisions are reporting units (i.e., components of the Glacier Bank operating segment) given that each division has a separate management team that regularly reviews its respective division financial information; however, the reporting units are aggregated into a single reporting unit due to the reporting units having similar economic characteristics. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) The goodwill of a reporting unit is tested for impairment between annual tests if an event occurs or circumstances change that would more-likely-than-not reduce the fair value of a reporting unit below its carrying amount. Examples of events and circumstances that could trigger the need for interim impairment testing include: • a significant change in legal factors or in the business climate; • an adverse action or assessment by a regulator; • unanticipated competition; • a loss of key personnel; • a more-likely-than-not expectation that a reporting unit or a significant portion of a reporting unit will be sold or otherwise disposed of; and • the testing for recoverability of a significant asset group within a reporting unit. For the goodwill impairment assessment, the Company has the option, prior to the two-step process, to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more-likely-than-not that the fair value of a reporting unit is less than its carrying value. The Company opted to bypass the qualitative assessment for its 2016 and 2015 annual goodwill impairment testing and proceed directly to the two -step goodwill impairment test. The goodwill impairment two-step process requires the Company to make assumptions and judgments regarding fair value. In the first step, the Company calculates an implied fair value based on a control premium analysis. If the implied fair value is less than the carrying value, the second step is completed to compute the impairment amount, if any, by determining the “implied fair value” of goodwill. This determination requires the allocation of the estimated fair value of the reporting units to the assets and liabilities of the reporting units. Any remaining unallocated fair value represents the “implied fair value” of goodwill, which is compared to the corresponding carrying value of goodwill to compute impairment, if any. For additional information relating to goodwill, see Note 5.
Non-Marketable Equity Securities	Non-Marketable Equity Securities Non-marketable equity securities primarily consist of Federal Home Loan Bank (“FHLB”) stock. FHLB stock is restricted because such stock may only be sold to FHLB at its par value. Due to restrictive terms, and the lack of a readily determinable market value, FHLB stock is carried at cost. The investments in FHLB stock are required investments related to the Company’s borrowings from FHLB. FHLB obtains its funding primarily through issuance of consolidated obligations of the FHLB system. The U.S. government does not guarantee these obligations, and each of the regional FHLBs is jointly and severally liable for repayment of each other’s debt.
Bank-Owned Life Insurance	Bank-Owned Life Insurance The Company maintains bank-owned life insurance policies on certain current and former employees and directors, which are recorded at their cash surrender values as determined by the insurance carriers. At December 31, 2016 and 2015 , the carrying value associated with these policies is $50,451,000 and $49,534,000 , respectively, and is recorded in other assets in the Company’s statements of financial position. The appreciation in the cash surrender value of the policies is recognized as a component of other non-interest income in the Company’s statements of operations.
Derivatives and Hedging Activities	Derivatives and Hedging Activities For asset and liability management purposes, the Company has entered into interest rate swap agreements to hedge against changes in forecasted cash flows due to interest rate exposures. The interest rate swaps are recognized as assets or liabilities on the Company’s statements of financial condition and measured at fair value. Fair value estimates are obtained from third parties and are based on pricing models. The Company does not enter into interest rate swap agreements for trading or speculative purposes. The Company takes into account the impact of bilateral collateral and master netting agreements that allows the Company to settle all interest rate swap agreements held with a single counterparty on a net basis, and to offset the net interest rate swap derivative position with the related collateral when recognizing interest rate swap derivative assets and liabilities. Interest rate swaps are contracts in which a series of interest payments are exchanged over a prescribed period. The notional amount upon which the interest payments are based is not exchanged. The swap agreements are derivative instruments and convert a portion of the Company’s forecasted variable rate debt to a fixed rate (i.e., cash flow hedge) over the payment term of the interest rate swap. The effective portion of the gain or loss on the cash flow hedging instruments is initially reported as a component of other comprehensive income and subsequently reclassified into earnings in the same period during which the transaction affects earnings. The ineffective portion of the gain or loss on derivative instruments, if any, is recognized in earnings. For the years ended December 31, 2016 , 2015 , and 2014 , the Company’s cash flow hedges were determined to be fully effective. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) Interest rate derivative financial instruments receive hedge accounting treatment only if they are designated as a hedge and are expected to be, and are, highly effective in substantially reducing interest rate risk arising from the assets and liabilities identified as exposing the Company to risk. Derivative financial instruments that do not meet specified hedging criteria are recorded at fair value with changes in fair value recorded in income. The Company’s interest rate swaps are considered highly effective and currently meet the hedge accounting criteria. Cash flows resulting from the interest rate derivative financial instruments that are accounted for as hedges of assets and liabilities are classified in the Company’s cash flow statement in the same category as the cash flows of the items being hedged. For additional information relating to interest rate swap agreements, see Note 10. The Company also has residential real estate derivatives for commitments to fund certain residential real estate loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of residential real estate loans to third party investors on a best efforts basis. It is the Company’s practice to enter into forward commitments for the future delivery of residential real estate loans when interest rate lock commitments are entered into in order to economically hedge the effect of changes in interest rates resulting from its commitments to fund the loans. These derivatives are not designated in hedge relationships. Such derivatives are short-term in nature and changes in fair value are not recorded as gains on sale of loans because the change is not significant.
Stock-based Compensation	Stock-based Compensation Stock-based compensation awards granted are valued at fair value and compensation cost is recognized on a straight-line basis, net of estimated forfeitures, over the requisite service period of each award. For additional information relating to stock-based compensation, see Note 12.
Advertising and Promotion	Advertising and Promotion Advertising and promotion costs are recognized in the period incurred.
Income Taxes	Income Taxes The Company’s income tax expense consists of current and deferred income tax expense. Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of enacted tax law to earnings or losses. Deferred income tax expense results from changes in deferred assets and liabilities between periods. The Company recognizes interest and penalties related to income tax matters in income tax expense. Deferred tax assets and liabilities are recognized for estimated future income tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases. The effect on deferred tax assets and liabilities of a change in income tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are reduced by a valuation allowance if, based on the weight of available evidence, it is more-likely-than-not that some portion or all of the deferred tax assets will not be realized. The term more-likely-than-not means a likelihood of more than fifty percent . The recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to the Company’s judgment. In assessing the need for a valuation allowance, the Company considers both positive and negative evidence. For additional information relating to income taxes, see Note 15.
Comprehensive Income	Comprehensive Income Comprehensive income consists of net income and other comprehensive income (“OCI”). OCI includes unrealized gains and losses, net of tax effect, on available-for-sale securities and derivatives used for cash flow hedges.
Earnings Per Share	Earnings Per Share Basic earnings per share is computed by dividing net income by the weighted-average number of shares of common stock outstanding during the period presented. Diluted earnings per share is computed by including the net increase in shares as if dilutive outstanding stock options were exercised and restricted stock awards were vested, using the treasury stock method. For additional information relating to earnings per share, see Note 17.
Reclassifications	Reclassifications Certain reclassifications have been made to the 2015 and 2014 financial statements to conform to the 2016 presentation.
Impact of Recent Authoritative Accounting Guidance	Impact of Recent Authoritative Accounting Guidance The Accounting Standards Codification ™ (“ASC”) is FASB’s officially recognized source of authoritative GAAP applicable to all public and non-public non-governmental entities. Rules and interpretive releases of the Securities and Exchange Commission (“SEC”) under the authority of the federal securities laws are also sources of authoritative GAAP for the Company as an SEC registrant. All other accounting literature is non-authoritative. The following paragraphs provide descriptions of recently adopted or newly issued but not yet effective accounting standards that could have a material effect on the Company’s financial position or results of operations. In January 2017, FASB amended FASB ASC Topic 350, Simplifying the Test for Goodwill. The amendments in the Update simplify the measurement of goodwill by eliminating Step 2 from the goodwill impairment test. Instead, under these amendments, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss should not exceed the total amount of goodwill allocated to that reporting unit. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company has goodwill from prior business combinations and performs an annual impairment test or more frequently if changes or circumstances occur that would more-likely-than-not reduce the fair value of the reporting unit below its carrying value. During the current year, the Company performed its impairment assessment and determined the fair value of the aggregated reporting units exceed the carrying value, such that the Company’s goodwill was not considered impaired. Although the Company cannot anticipate future goodwill impairment assessments, based on the most recent assessment, it is unlikely that an impairment amount would need to be calculated and, therefore, the Company does not anticipate a material impact from these amendments to the Company’s financial position and results of operations. The current accounting policies and processes are not anticipated to change, except for the elimination of the Step 2 analysis. For additional information regarding goodwill impairment testing, see Note 5. In January 2017, FASB amended FASB ASC Topic 250, Accounting Changes and Error Corrections. The amendments in the Update relate to SEC paragraphs pursuant to Staff Announcements at the September 22, 2016 and November 17, 2016 EITF meetings related to disclosure of the impact of recently issued accounting standards. The SEC staff view that a registrant should evaluate ASC updates that have not yet been adopted to determine the appropriate financial disclosures about the potential material effects of the updates on the financial statements when adopted. If a registrant does not know or cannot reasonably estimate the impact of an update, then in addition to making a statement to that effect, the registrant should consider additional qualitative financial statement disclosures to assist the reader in assessing the significance of the impact. The staff expects the additional qualitative disclosures to include a description of the effect of the accounting policies expected to be applied compared to current accounting policies. Also, the registrant should describe the status of its process to implement the new standards and the significant implementation matters yet to be addressed. The amendments specifically addressed recent ASC amendments to Topic 326, Financial Instruments - Credit Losses, Topic 842, Leases, and Topic 606, Revenue from Contracts with Customers, although, the amendments apply to any subsequent amendments to guidance in the ASC. The Company adopted the amendments in this Update during the fourth quarter of 2016 and appropriate disclosures have been included in this Note for each recently issued accounting standard. In June 2016, FASB amended FASB ASC Topic 326, Financial Instruments - Credit Losses. The amendments in this Update replace the incurred loss model with a methodology that reflects expected credit losses over the life of the loan and requires consideration of a broader range of reasonable and supportable information to calculate credit loss estimates. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2019. The Company is currently evaluating the impact of these amendments to the Company’s financial position and results of operations and currently does not know or cannot reasonably quantify the impact of the adoption of the amendments as a result of the complexity and extensive changes from the amendments. The ALLL is a material estimate of the Company and given the change from an incurred loss model to a methodology that considers the credit loss over the life of the loan, there is the potential for an increase in the ALLL at adoption date. The Company is anticipating a significant change in the processes and procedures to calculate the ALLL, including changes in assumptions and estimates to consider expected credit losses over the life of the loan versus the current accounting practice that utilizes the incurred loss model. The Company will also develop new procedures for determining an allowance for credit losses relating to held-to-maturity investment securities. In addition, the current accounting policy and procedures for other-than-temporary impairment on available-for-sale investment securities will be replaced with an allowance approach. The Company is expecting to begin developing and implementing processes and procedures during the next two years to ensure it is fully compliant with the amendments at adoption date. For additional information on the allowance for loan losses, see Note 3. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) In March 2016, FASB amended FASB ASC Topic 718, Compensation - Stock Compensation. The amendments in this Update address certain aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification of awards on the statement of cash flows. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2016. The Company will adopt the amendments as of January 1, 2017 and the Company is currently evaluating the full impact of the of these amendments. The Company has a stock-based compensation plan for which the amendments will result in the associated excess tax benefits or deficiencies being recognized as tax expense or benefit in the income statement instead of the current accounting treatment which requires excess tax benefits to be recognized as an adjustment to paid-in capital and excess tax deficiencies to be recognized as either an offset to accumulated excess tax benefits, if any, or to the income statement. In addition, such amounts are to be classified as an operating activity in the statement of cash flows instead of the current accounting treatment which requires it to be classified as both an operating and a financing activity. The stock based compensation plan has not historically generated material amounts of excess tax benefits or deficiencies and, therefore, the Company does not anticipate a material change in the Company’s financial position or results of operation, as a result of adopting this Update. The Company is currently implementing the new processes and does not anticipate significant changes. For additional information on the stock-based compensation plan, see Note 12. In February 2016, FASB amended FASB ASC Topic 842, Leases. The amendments in this Update address several aspects of lease accounting with the significant change being the recognition of lease assets and lease liabilities for leases previously classified as operating leases. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. The Company has several lease agreements for which the amendments will require the Company to recognize a lease liability to make lease payments and a right-of-use asset which will represent its right to use the underlying asset for the lease term. The Company is currently reviewing the amendments to ensure it is fully compliant by the adoption date and doesn’t expect to early adopt. As permitted by the amendments, the Company is anticipating electing an accounting policy to not recognize lease assets and lease liabilities for leases with a term of twelve months or less. The impact is not expected to have a material effect on the Company’s financial position or results of operations since the Company does not have a material amount of lease agreements. The Company is currently in the process of fully evaluating the amendments and will subsequently implement new processes which are not expected to significantly change since the Company already has processes for certain lease agreements that recognize the lease assets and lease liabilities. In addition, the Company will change its current accounting policies to comply with the amendments with such changes as mentioned above. For additional information on the Company’s leases, see Note 4. In January 2016, FASB amended FASB ASC Topic 825, Financial Instruments. The amendments in this Update address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The amendments are effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2017. Early adoption is only permitted under certain circumstances outlined in the amendments. A reporting entity should apply the amendments by means of a cumulative-effect adjustment to the Company’s statement of financial condition as of the beginning of the reporting year of adoption. The amendments will impact the Company in a few areas including requiring equity investments (with certain exclusions) to be measured at fair value with the changes recognized in net income, requirement to utilize an exit price when measuring the fair value of financial instruments, additional disclosures related to other comprehensive income, evaluation of a valuation allowance on a deferred tax asset related to available-for-sale investment securities in combination with the entity’s other deferred tax assets, and other disclosure changes. The Company is currently evaluating the impact of these amendments, but does not expect them to have a material material effect on the Company’s financial position or results of operations since it does not have a material amount of equity securities or a valuation allowance. However, the amendments will have an impact on certain items that are disclosed at fair value that are not currently utilizing the exit price notion when measuring fair value. At this time, the Company cannot quantify the change in the fair value of such disclosures since the Company is currently evaluating the full impact of the Update and is in the planning stages of developing appropriate procedures and processes to comply with the disclosure requirements of such amendments. The current accounting policies and procedures will be modified after the Company has fully evaluated the standard to comply with the accounting changes mentioned above. For additional information on fair value of assets and liabilities, see Note 20. Note 1. Nature of Operations and Summary of Significant Accounting Policies (continued) In September 2015, FASB amended FASB ASC Topic 805, Business Combinations. The amendments in this Update require that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustments are determined. The amendments in this Update require that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. The amendments in this Update require an entity to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. The amendments were to be applied prospectively to all periods presented and were effective for public business entities for annual periods and interim periods within those annual periods, beginning after December 15, 2015. The Company strives to complete its analysis of business combinations before the first reporting period after a business combination even though accounting standards allow for a longer measurement period, therefore, the Company has evaluated the impact of these amendments and does not anticipate the amendments to have a material effect on the Company’s financial position or results of operations with future business combinations. The Company’s accounting policies and procedures have been modified in the event of a material future provisional adjustment that is identified during the measurement period after a business combination to reflect the changes from these amendments. For additional information on mergers and acquisitions, see Note 22. In February 2015, FASB amended FASB ASC Topic 810, Consolidation. The amendments in this Update make targeted changes to the current consolidation guidance and end a deferral available for investment companies. The amendments modify the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities. Consolidation conclusions may change for entities that already are VIEs due to changes in how entities would analyze related-party relationships and fee arrangements. The amendments relax existing criteria for determining when fees paid to a decision maker or service provider do not represent a variable interest by focusing on whether those fees are “at market.” The amendments eliminate both the consolidation model specific to limited partnerships and the current presumption that a general partner controls a limited partnership. Application of the new amendments could result in some entities being deconsolidated or considered a VIE and subject to additional disclosures. The amendments were effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2015. The Company adopted these amendments on January 1, 2016, which resulted in the Company determining it was no longer the primary beneficiary of certain partnerships related to its LIHTC investments and, as a result, deconsolidated these investments. The impact of the amendments did not have a material effect on the Company’s financial position or results of operations since these investments were not a material component of the Company’s operations. The Company’s accounting policies and processes were modified as it related to the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities. For additional information on the impact of these amendments, see Note 6. In May 2014, FASB amended FASB ASC Topic 606, Revenue from Contracts with Customers. The amendments clarify the principals for recognizing revenue and develop a common revenue standard among industries. The new guidance establishes the following core principal: 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 goods or services. Five steps are provided for a company or organization to follow to achieve such core principle. The new guidance also includes a cohesive set of disclosure requirements that will provide users of financial statements with comprehensive information about the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The entity should apply the amendments using one of two retrospective methods described in the amendment. Accounting Standards Update No. 2015-14, Revenue from Contracts with Customers (Topic 606) delayed the effective date for public entities to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Several subsequent amendments have been issued that provide clarifying guidance and are effective with the adoption of the original Update. Early application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company is in its preliminary stages of evaluating the impact of these amendments, although it doesn’t expect the amendments to have a significant impact to the Company’s financial position or results of operation. The amendments could potentially impact the accounting procedures and processes over the recognition of certain revenue sources, including, but not limited to, non-interest income. The Company is expecting to begin developing processes and procedures during 2017 to ensure it is fully compliant with these amendments at the date of adoption.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Amortized cost, gross unrealized gains and losses and the fair value of investment securities	The following tables present the amortized cost, the gross unrealized gains and losses and the fair value of the Company’s investment securities: December 31, 2016 Amortized Cost Gross Unrealized Fair Value (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 39,554 15 (162 ) 39,407 U.S. government sponsored enterprises 19,557 55 (42 ) 19,570 State and local governments 775,395 20,941 (9,963 ) 786,373 Corporate bonds 471,569 1,175 (793 ) 471,951 Mortgage-backed securities 1 1,116,727 2,774 (11,325 ) 1,108,176 Total available-for-sale 2,422,802 24,960 (22,285 ) 2,425,477 Held-to-maturity State and local governments 675,674 21,400 (7,985 ) 689,089 Total held-to-maturity 675,674 21,400 (7,985 ) 689,089 Total investment securities $ 3,098,476 46,360 (30,270 ) 3,114,566 December 31, 2015 Amortized Cost Gross Unrealized Fair Value (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 47,868 15 (432 ) 47,451 U.S. government sponsored enterprises 93,230 100 (163 ) 93,167 State and local governments 856,738 34,159 (5,878 ) 885,019 Corporate bonds 386,629 611 (3,077 ) 384,163 Mortgage-backed securities 1 1,203,548 6,180 (8,768 ) 1,200,960 Total available-for-sale 2,588,013 41,065 (18,318 ) 2,610,760 Held-to-maturity State and local governments 702,072 31,863 (4,422 ) 729,513 Total held-to-maturity 702,072 31,863 (4,422 ) 729,513 Total investment securities $ 3,290,085 72,928 (22,740 ) 3,340,273 ________ 1 Consists of residential mortgage-backed securities with fair values of $1,011,252,000 and $1,200,503,000 at December 31, 2016 and 2015 , respectively, and commercial mortgage-backed securities, with fair values of $96,924,000 and $457,000 at December 31, 2016 and 2015 , respectively.
Amortized cost and fair value of securities by contractual maturity	The following table presents the amortized cost and fair value of available-for-sale and held-to-maturity securities by contractual maturity at December 31, 2016 . Actual maturities may differ from expected or contractual maturities since issuers have the right to prepay obligations with or without prepayment penalties. December 31, 2016 Available-for-Sale Held-to-Maturity (Dollars in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 149,379 149,650 — — Due after one year through five years 437,896 438,650 594 597 Due after five years through ten years 197,462 200,654 55,310 56,048 Due after ten years 521,338 528,347 619,770 632,444 1,306,075 1,317,301 675,674 689,089 Mortgage-backed securities 1 1,116,727 1,108,176 — — Total $ 2,422,802 2,425,477 675,674 689,089 ________ 1 Mortgage-backed securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds.
Proceeds from sales and calls of investment securities and associated gains and losses	Proceeds from sales and calls of investment securities and the associated gains and losses that have been included in earnings are listed below: Years ended (Dollars in thousands) December 31, December 31, December 31, Available-for-sale Proceeds from sales and calls of investment securities $ 212,140 167,660 219,849 Gross realized gains 1 2,459 1,877 501 Gross realized losses 1 (3,794 ) (1,808 ) (705 ) Held-to-maturity Proceeds from calls of investment securities 25,405 20,997 8,930 Gross realized gains 1 97 50 22 Gross realized losses 1 (225 ) (100 ) (6 ) __________ 1 The gain or loss on the sale or call of each investment security is determined by the specific identification method.
Summary of investment securities with an unrealized loss position	Investment securities with an unrealized loss position are summarized as follows: December 31, 2016 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Available-for-sale U.S. government and federal agency $ 6,718 (24 ) 26,239 (138 ) 32,957 (162 ) U.S. government sponsored enterprises 6,049 (42 ) — — 6,049 (42 ) State and local governments 222,700 (4,949 ) 81,783 (5,014 ) 304,483 (9,963 ) Corporate bonds 174,821 (774 ) 6,141 (19 ) 180,962 (793 ) Mortgage-backed securities 778,109 (10,657 ) 29,957 (668 ) 808,066 (11,325 ) Total available-for-sale $ 1,188,397 (16,446 ) 144,120 (5,839 ) 1,332,517 (22,285 ) Held-to-maturity State and local governments $ 117,912 (1,712 ) 86,601 (6,273 ) 204,513 (7,985 ) Total held-to-maturity $ 117,912 (1,712 ) 86,601 (6,273 ) 204,513 (7,985 ) December 31, 2015 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Available-for-sale U.S. government and federal agency $ 42,493 (432 ) 2 — 42,495 (432 ) U.S. government sponsored enterprises 60,010 (163 ) — — 60,010 (163 ) State and local governments 102,422 (1,629 ) 115,943 (4,249 ) 218,365 (5,878 ) Corporate bonds 228,258 (1,812 ) 13,962 (1,265 ) 242,220 (3,077 ) Mortgage-backed securities 730,412 (7,226 ) 53,021 (1,542 ) 783,433 (8,768 ) Total available-for-sale $ 1,163,595 (11,262 ) 182,928 (7,056 ) 1,346,523 (18,318 ) Held-to-maturity State and local governments $ 42,322 (594 ) 81,709 (3,828 ) 124,031 (4,422 ) Total held-to-maturity $ 42,322 (594 ) 81,709 (3,828 ) 124,031 (4,422 )

Loans Receivable, Net (Tables)

Loans Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Summary of loans receivable	The following table presents loans receivable for each portfolio class of loans: At or for the Year ended (Dollars in thousands) December 31, December 31, Residential real estate loans $ 674,347 688,912 Commercial loans Real estate 2,990,141 2,633,953 Other commercial 1,342,250 1,099,564 Total 4,332,391 3,733,517 Consumer and other loans Home equity 434,774 420,901 Other consumer 242,951 235,351 Total 677,725 656,252 Loans receivable 1 5,684,463 5,078,681 Allowance for loan and lease losses (129,572 ) (129,697 ) Loans receivable, net $ 5,554,891 4,948,984 Weighted-average interest rate on loans (tax-equivalent) 4.77 % 4.84 % __________ 1 Includes net deferred fees, costs, premiums and discounts of $13,372,000 and $15,529,000 at December 31, 2016 and 2015 , respectively.
Summary of the activity in the ALLL	The following tables summarize the activity in the ALLL by portfolio segment: Year ended December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 129,697 14,427 67,877 32,525 8,998 5,870 Provision for loan losses 2,333 (1,734 ) (2,686 ) 4,835 (520 ) 2,438 Charge-offs (11,496 ) (464 ) (3,082 ) (1,144 ) (1,185 ) (5,621 ) Recoveries 9,038 207 3,664 1,607 279 3,281 Balance at end of period $ 129,572 12,436 65,773 37,823 7,572 5,968 Year ended December 31, 2015 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 129,753 14,680 67,799 30,891 9,963 6,420 Provision for loan losses 2,284 640 (696 ) 3,030 (480 ) (210 ) Charge-offs (7,002 ) (985 ) (1,920 ) (2,322 ) (809 ) (966 ) Recoveries 4,662 92 2,694 926 324 626 Balance at end of period $ 129,697 14,427 67,877 32,525 8,998 5,870 Note 3. Loans Receivable, Net (continued) Year ended December 31, 2014 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 130,351 14,067 70,332 28,630 9,299 8,023 Provision for loan losses 1,912 716 (2,877 ) 3,708 1,254 (889 ) Charge-offs (7,603 ) (431 ) (1,802 ) (3,058 ) (1,038 ) (1,274 ) Recoveries 5,093 328 2,146 1,611 448 560 Balance at end of period $ 129,753 14,680 67,799 30,891 9,963 6,420
Summary of ALLL and loans receivable	The following tables disclose the balance in the ALLL and the recorded investment in loans by portfolio segment: December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Allowance for loan and lease losses Individually evaluated for impairment $ 6,881 856 922 4,419 296 388 Collectively evaluated for impairment 122,691 11,580 64,851 33,404 7,276 5,580 Total allowance for loan and lease losses $ 129,572 12,436 65,773 37,823 7,572 5,968 Loans receivable Individually evaluated for impairment $ 130,263 11,612 85,634 23,950 5,934 3,133 Collectively evaluated for impairment 5,554,200 662,735 2,904,507 1,318,300 428,840 239,818 Total loans receivable $ 5,684,463 674,347 2,990,141 1,342,250 434,774 242,951 December 31, 2015 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Allowance for loan and lease losses Individually evaluated for impairment $ 8,124 782 1,629 5,277 64 372 Collectively evaluated for impairment 121,573 13,645 66,248 27,248 8,934 5,498 Total allowance for loan and lease losses $ 129,697 14,427 67,877 32,525 8,998 5,870 Loans receivable Individually evaluated for impairment $ 140,773 20,767 85,845 23,874 6,493 3,794 Collectively evaluated for impairment 4,937,908 668,145 2,548,108 1,075,690 414,408 231,557 Total loans receivable $ 5,078,681 688,912 2,633,953 1,099,564 420,901 235,351
Summary of the impaired loans	The following tables disclose information related to impaired loans by portfolio segment: At or for the Year ended December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Loans with a specific valuation allowance Recorded balance $ 22,128 2,759 9,129 8,814 334 1,092 Unpaid principal balance 22,374 2,825 9,130 8,929 345 1,145 Specific valuation allowance 6,881 856 922 4,419 296 388 Average balance 26,745 4,942 10,441 9,840 257 1,265 Loans without a specific valuation allowance Recorded balance $ 108,135 8,853 76,505 15,136 5,600 2,041 Unpaid principal balance 131,059 9,925 94,180 17,724 7,120 2,110 Average balance 108,827 12,858 72,323 15,537 6,004 2,105 Total Recorded balance $ 130,263 11,612 85,634 23,950 5,934 3,133 Unpaid principal balance 153,433 12,750 103,310 26,653 7,465 3,255 Specific valuation allowance 6,881 856 922 4,419 296 388 Average balance 135,572 17,800 82,764 25,377 6,261 3,370 At or for the Year ended December 31, 2015 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Loans with a specific valuation allowance Recorded balance $ 34,683 8,253 12,554 11,923 102 1,851 Unpaid principal balance 36,157 9,198 12,581 12,335 109 1,934 Specific valuation allowance 8,124 782 1,629 5,277 64 372 Average balance 36,176 6,393 15,827 11,768 426 1,762 Loans without a specific valuation allowance Recorded balance $ 106,090 12,514 73,291 11,951 6,391 1,943 Unpaid principal balance 132,718 13,969 94,028 15,539 7,153 2,029 Average balance 116,356 13,615 78,684 15,479 6,350 2,228 Total Recorded balance $ 140,773 20,767 85,845 23,874 6,493 3,794 Unpaid principal balance 168,875 23,167 106,609 27,874 7,262 3,963 Specific valuation allowance 8,124 782 1,629 5,277 64 372 Average balance 152,532 20,008 94,511 27,247 6,776 3,990
Loan portfolio aging analysis	The following tables present an aging analysis of the recorded investment in loans by portfolio segment: December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Accruing loans 30-59 days past due $ 20,599 6,338 5,079 5,388 2,439 1,355 Accruing loans 60-89 days past due 5,018 1,398 754 1,352 844 670 Accruing loans 90 days or more past due 1,099 266 145 283 191 214 Non-accrual loans 49,332 4,528 30,216 8,817 5,240 531 Total past due and non-accrual loans 76,048 12,530 36,194 15,840 8,714 2,770 Current loans receivable 5,608,415 661,817 2,953,947 1,326,410 426,060 240,181 Total loans receivable $ 5,684,463 674,347 2,990,141 1,342,250 434,774 242,951 December 31, 2015 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Accruing loans 30-59 days past due $ 15,801 4,895 4,393 3,564 1,601 1,348 Accruing loans 60-89 days past due 3,612 961 1,841 286 280 244 Accruing loans 90 days or more past due 2,131 — 231 1,820 15 65 Non-accrual loans 51,133 8,073 28,819 7,691 6,022 528 Total past due and non-accrual loans 72,677 13,929 35,284 13,361 7,918 2,185 Current loans receivable 5,006,004 674,983 2,598,669 1,086,203 412,983 233,166 Total loans receivable $ 5,078,681 688,912 2,633,953 1,099,564 420,901 235,351
Summary of TDRs	The following tables present TDRs that occurred during the periods presented and the TDRs that occurred within the previous twelve months that subsequently defaulted during the periods presented: Year ended December 31, 2016 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer TDRs that occurred during the period Number of loans 34 — 10 21 3 — Pre-modification recorded balance $ 22,907 — 8,454 14,183 270 — Post-modification recorded balance $ 22,848 — 8,415 14,166 267 — TDRs that subsequently defaulted Number of loans 1 — — 1 — — Recorded balance $ 6 — — 6 — — Note 3. Loans Receivable, Net (continued) Year ended December 31, 2015 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer TDRs that occurred during the period Number of loans 64 3 25 22 1 13 Pre-modification recorded balance $ 22,316 2,259 8,877 10,545 137 498 Post-modification recorded balance $ 23,110 2,203 9,927 10,325 157 498 TDRs that subsequently defaulted Number of loans 7 1 1 4 — 1 Recorded balance $ 2,556 1,947 78 529 — 2 Year ended December 31, 2014 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer TDRs that occurred during the period Number of loans 51 — 18 24 6 3 Pre-modification recorded balance $ 37,781 — 21,760 12,522 3,385 114 Post-modification recorded balance $ 37,075 — 21,803 11,884 3,274 114 TDRs that subsequently defaulted Number of loans 5 — 2 1 2 — Recorded balance $ 4,453 — 927 693 2,833 —

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Premises and equipment, net of accumulated depreciation	Premises and equipment, net of accumulated depreciation, consist of the following: (Dollars in thousands) December 31, 2016 December 31, 2015 Land $ 29,648 30,108 Office buildings and construction in progress 173,886 187,787 Furniture, fixtures and equipment 84,559 78,803 Leasehold improvements 7,853 8,028 Accumulated depreciation (119,748 ) (110,696 ) Net premises and equipment $ 176,198 194,030
Future Minimum Rental Commitments required under Operating and Capital Leases	The total future minimum rental commitments required under operating and capital leases that have initial or remaining noncancelable lease terms in excess of one year at December 31, 2016 are as follows: (Dollars in thousands) Capital Leases Operating Leases Total Years ending December 31, 2017 $ 92 2,387 2,479 2018 92 2,146 2,238 2019 92 1,960 2,052 2020 92 1,548 1,640 2021 11 1,111 1,122 Thereafter — 3,905 3,905 Total minimum lease payments 379 13,057 13,436 Less: Amount representing interest 44 Present value of minimum lease payments 335 Less: Current portion of obligations under capital leases 75 Long-term portion of obligations under capital leases $ 260

Other Intangible Assets and G35

Other Intangible Assets and Goodwill (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Core deposit intangibles	The following table sets forth information regarding the Company’s core deposit intangibles: At or for the Years ended (Dollars in thousands) December 31, December 31, December 31, Gross carrying value $ 34,742 38,527 32,056 Accumulated amortization (22,395 ) (23,972 ) (21,156 ) Net carrying value $ 12,347 14,555 10,900 Aggregate amortization expense $ 2,970 2,964 2,811 Weighted-average amortization period 9.6 years Estimated amortization expense for the years ending December 31, 2017 $ 2,161 2018 1,718 2019 1,618 2020 1,557 2021 1,497
Changes in the carrying value of goodwill	The following table discloses the changes in the carrying value of goodwill: Years ended (Dollars in thousands) December 31, December 31, December 31, Net carrying value at beginning of period $ 140,638 129,706 129,706 Acquisitions 6,415 10,932 — Net carrying value at end of period $ 147,053 140,638 129,706
Gross carrying value of goodwill and the accumulated impairment charge	The gross carrying value of goodwill and the accumulated impairment charge consists of the following: (Dollars in thousands) December 31, December 31, Gross carrying value $ 187,212 180,797 Accumulated impairment charge 1 (40,159 ) (40,159 ) Net carrying value $ 147,053 140,638 __________ 1 A goodwill impairment charge was recognized in 2011 and was due to high levels of volatility and dislocation in bank stock prices nationwide.

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Carrying amounts of consolidated VIEs' assets and liabilities	The following table summarizes the carrying amounts of the consolidated VIEs’ assets and liabilities included in the Company’s statements of financial condition and are adjusted for intercompany eliminations. All assets presented can be used only to settle obligations of the consolidated VIEs and all liabilities presented consist of liabilities for which creditors and other beneficial interest holders therein have no recourse to the general credit of the Company. (Dollars in thousands) December 31, December 31, Assets Loans receivable $ 36,950 57,126 Premises and equipment, net — 13,503 Accrued interest receivable 120 117 Other assets 1,984 1,429 Total assets $ 39,054 72,175 Liabilities Other borrowed funds $ 4,105 6,195 Accrued interest payable 2 9 Other liabilities 27 139 Total liabilities $ 4,134 6,343
Amortization expense and tax credits and other tax benefits recognized for qualified affordable housing project investments	The following table summarizes the amortization expense and the amount of tax credits and other tax benefits recognized for qualified affordable housing project investments during the periods presented. Amortization expense is recognized as a component of income tax expense. Years ended (Dollars in thousands) December 31, 2016 December 31, 2015 December 31, Amortization expense $ 1,079 1,175 1,270 Tax credits and other tax benefits recognized 436 377 419

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Scheduled maturities of time deposits	The scheduled maturities of time deposits are as follows: (Dollars in thousands) Amount Years ending December 31, 2017 $ 644,881 2018 149,557 2019 69,782 2020 39,756 2021 44,159 Thereafter 579 $ 948,714

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Carrying Value of Repurchase Agreements	The following tables summarize the carrying value of the Company’s repurchase agreements by remaining contractual maturity and category of collateral: December 31, 2016 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total Mortgage-backed securities $ 473,007 643 473,650 December 31, 2015 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total U.S. government sponsored enterprises $ 12,507 — 12,507 Mortgage-backed securities 408,460 2,447 410,907 Total $ 420,967 2,447 423,414
FHLB Advances	The scheduled maturities of FHLB advances consist of the following: December 31, 2016 December 31, 2015 (Dollars in thousands) Amount Weighted Rate Amount Weighted Rate Maturing within one year $ 41,099 0.84 % $ 185,091 1.02 % Maturing one year through two years 70,983 1.42 % 179 4.19 % Maturing two years through three years 927 2.16 % 70,597 1.01 % Maturing three years through four years 1,728 3.66 % 167 3.79 % Maturing four years through five years 135,000 3.08 % 945 4.98 % Thereafter 2,012 5.33 % 137,152 3.12 % Total $ 251,749 2.27 % $ 394,131 1.76 %

Subordinated Debentures (Tables

Subordinated Debentures (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Instruments [Abstract]
Summary of Subordinated Debentures	The terms of the subordinated debentures, arranged by maturity date, are reflected in the table below. The amounts include fair value adjustments from acquisitions. December 31, 2016 Variable Rate Structure Maturity Date (Dollars in thousands) Balance Rate First Company Statutory Trust 2001 $ 3,207 4.187 % 3 mo LIBOR plus 3.30% 07/31/2031 First Company Statutory Trust 2003 2,361 4.247 % 3 mo LIBOR plus 3.25% 03/26/2033 Glacier Capital Trust II 46,393 3.630 % 3 mo LIBOR plus 2.75% 04/07/2034 Citizens (ID) Statutory Trust I 5,155 3.643 % 3 mo LIBOR plus 2.65% 06/17/2034 Glacier Capital Trust III 36,083 2.170 % 3 mo LIBOR plus 1.29% 04/07/2036 Glacier Capital Trust IV 30,928 2.533 % 3 mo LIBOR plus 1.57% 09/15/2036 Bank of the San Juans Bancorporation Trust I 1,864 2.751 % 3 mo LIBOR plus 1.82% 03/01/2037 $ 125,991

Derivatives and Hedging Activ40

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Interest Rate Swap Derivative Financial Instruments	The Company’s interest rate swap derivative financial instruments as of December 31, 2016 are as follows: (Dollars in thousands) Forecasted Notional Amount Variable Interest Rate 1 Fixed Interest Rate 1 Payment Term Interest rate swap $ 160,000 3 month LIBOR 3.378 % Oct. 21, 2014 - Oct. 21, 2021 Interest rate swap 100,000 3 month LIBOR 2.498 % Nov. 30, 2015 - Nov. 30, 2022 __________ 1 The Company pays the fixed interest rate and the counterparty pays the Company the variable interest rate.
Summary of Pre-Tax Gains or Losses	The following table presents the pre-tax gains or losses recorded in accumulated other comprehensive income and the Company’s statements of operations relating to the interest rate swap derivative financial instruments: Years ended (Dollars in thousands) December 31, December 31, December 31, Interest rate swaps Amount of gain (loss) recognized in OCI (effective portion) $ (1,643 ) (7,857 ) (19,557 ) Amount of loss reclassified from OCI to interest expense (6,417 ) (5,025 ) (993 ) Amount of loss recognized in other non-interest expense (ineffective portion) — — —
Offsetting Liabilities	The following table discloses the offsetting of financial liabilities and interest rate swap derivative liabilities. There were no interest rate swap derivative assets at the dates presented. December 31, 2016 December 31, 2015 (Dollars in thousands) Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statements of Financial Position Net Amounts of Liabilities Presented in the Statements of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statements of Financial Position Net Amounts of Liabilities Presented in the Statements of Financial Position Interest rate swaps $ 14,725 — 14,725 19,499 — 19,499

Regulatory Capital (Tables)

Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Capital adequacy guidelines and compliance	The following tables illustrate the FRB’s adequacy guidelines and the Company’s and the Bank’s compliance with those guidelines: December 31, 2016 Actual Required for Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Regulations (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Total capital (to risk-weighted assets) Consolidated $ 1,179,673 16.38 % $ 576,092 8.00 % N/A N/A Glacier Bank 1,131,949 15.76 % 574,658 8.00 % $ 718,323 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated $ 1,089,142 15.12 % $ 432,069 6.00 % N/A N/A Glacier Bank 1,041,640 14.50 % 430,994 6.00 % $ 574,658 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated $ 966,701 13.42 % $ 324,052 4.50 % N/A N/A Glacier 1,041,640 14.50 % 323,245 4.50 % $ 466,910 6.50 % Tier 1 capital (to average assets) Consolidated $ 1,089,142 11.90 % $ 365,994 4.00 % N/A N/A Glacier Bank 1,041,640 11.45 % 363,945 4.00 % $ 454,932 5.00 % December 31, 2015 Actual Required for Capital Adequacy Purposes To Be Well Capitalized (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio Total capital (to risk-weighted assets) Consolidated $ 1,131,460 17.17 % $ 527,160 8.00 % N/A N/A Glacier Bank 1,093,669 16.66 % 525,228 8.00 % $ 656,535 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated $ 1,048,505 15.91 % $ 395,370 6.00 % N/A N/A Glacier Bank 1,010,981 15.40 % 393,921 6.00 % $ 525,228 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated $ 926,523 14.06 % $ 296,528 4.50 % N/A N/A Glacier 1,010,981 15.40 % 295,441 4.50 % $ 426,748 6.50 % Tier 1 capital (to average assets) Consolidated $ 1,048,505 12.01 % $ 349,066 4.00 % N/A N/A Glacier Bank 1,010,981 11.66 % 346,715 4.00 % $ 433,394 5.00 % __________ N/A - Not applicable

Stock-based Compensation Plan (

Stock-based Compensation Plan (Tables)	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Activity for restricted stock awards	The following table summarizes the restricted stock award activity for the year ended December 31, 2016 : Restricted Stock Weighted- Average Grant Date Fair Value Non-vested at December 31, 2015 205,989 $ 24.24 Granted 134,329 23.38 Vested (115,070 ) 22.80 Forfeited (2,516 ) 24.52 Non-vested at December 31, 2016 222,732 24.46

Other Expenses (Tables)

Other Expenses (Tables)	12 Months Ended
	Dec. 31, 2016
Other Expenses [Abstract]
Schedule of Other Expenses	Other expenses consists of the following: Years ended (Dollars in thousands) December 31, December 31, December 31, Debit card expenses $ 8,479 6,153 5,802 Consulting and outside services 6,080 5,525 4,179 Telephone 3,867 3,353 2,911 Loan expenses 3,611 2,824 2,513 Employee expenses 3,611 2,508 2,156 Checking and operating expenses 2,942 3,554 3,517 Printing and supplies 2,807 3,530 3,547 Postage 2,789 3,716 3,391 VIE write-downs and other expenses 2,702 4,528 4,231 Business development 1,847 1,526 1,401 Accounting and audit fees 1,674 1,401 1,393 Legal fees 1,391 1,082 1,455 ATM expenses 900 1,082 1,268 Other 4,460 3,983 3,884 Total other expenses $ 47,160 44,765 41,648

Federal and State Income Taxes

Federal and State Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Summary of consolidated income tax expense	The following table is a summary of consolidated income tax expense: Years ended (Dollars in thousands) December 31, December 31, December 31, Current Federal $ 30,461 28,705 21,860 State 9,283 9,374 8,118 Total current income tax expense 39,744 38,079 29,978 Deferred 1 Federal (70 ) (3,451 ) 5,016 State (12 ) (629 ) 915 Total deferred income tax (benefit) expense (82 ) (4,080 ) 5,931 Total income tax expense $ 39,662 33,999 35,909 __________ 1 Includes tax benefit of operating loss carryforwards of $571,000 , $391,000 and $0 for the years ended December 31, 2016 , 2015 , and 2014 , respectively.
Summary of effective tax rate	Combined federal and state income tax expense differs from that computed at the federal statutory corporate tax rate as follows: Years ended December 31, December 31, December 31, Federal statutory rate 35.0 % 35.0 % 35.0 % State taxes, net of federal income tax benefit 3.8 % 3.7 % 4.0 % Tax-exempt interest income (12.2 )% (12.6 )% (11.5 )% Tax credits (2.1 )% (3.0 )% (2.8 )% Other, net 0.2 % (0.5 )% (0.5 )% Effective tax rate 24.7 % 22.6 % 24.2 %
Summary of net deferred tax asset	The tax effect of temporary differences which give rise to a significant portion of deferred tax assets and deferred tax liabilities are as follows: (Dollars in thousands) December 31, December 31, Deferred tax assets Allowance for loan and lease losses $ 50,172 50,123 Deferred compensation 8,320 8,166 Other real estate owned 8,309 8,380 Interest rate swap agreements 5,705 7,554 Acquisition fair market value adjustments 4,763 5,842 Net operating loss carryforwards 4,737 3,590 Employee benefits 3,927 3,165 Other 5,569 5,433 Total gross deferred tax assets 91,502 92,253 Deferred tax liabilities Deferred loan costs (8,061 ) (7,427 ) Intangibles (5,477 ) (6,272 ) FHLB stock dividends (3,976 ) (4,601 ) Depreciation of premises and equipment (3,111 ) (2,376 ) Available-for-sale securities (1,036 ) (8,812 ) Other (2,720 ) (4,290 ) Total gross deferred tax liabilities (24,381 ) (33,778 ) Net deferred tax asset $ 67,121 58,475
Income tax return jurisdictions and years subject to examination	The following schedule summarizes the years that remain subject to examination as of December 31, 2016 : Years ended December 31, Federal 2013, 2014 and 2015 Montana 2013, 2014 and 2015 Idaho 2013, 2014 and 2015 Colorado 2012, 2013, 2014 and 2015 Utah 2013, 2014 and 2015

Accumulated Other Comprehensi45

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Activity within Accumulated Other Comprehensive Income, Net of Tax	The following table illustrates the activity within accumulated other comprehensive income by component, net of tax: (Dollars in thousands) Gains on Available-For-Sale Securities Losses on Derivatives Used for Cash Flow Hedges Total Balance at December 31, 2013 $ 8,485 1,160 9,645 Other comprehensive income (loss) before reclassifications 19,335 (11,969 ) 7,366 Amounts reclassified from accumulated other comprehensive income 125 608 733 Net current period other comprehensive income (loss) 19,460 (11,361 ) 8,099 Balance at December 31, 2014 $ 27,945 (10,201 ) 17,744 Other comprehensive loss before reclassifications (13,968 ) (4,823 ) (18,791 ) Amounts reclassified from accumulated other comprehensive income (42 ) 3,078 3,036 Net current period other comprehensive loss (14,010 ) (1,745 ) (15,755 ) Balance at December 31, 2015 $ 13,935 (11,946 ) 1,989 Other comprehensive loss before reclassifications (13,113 ) (1,006 ) (14,119 ) Amounts reclassified from accumulated other comprehensive income 817 3,931 4,748 Net current period other comprehensive (loss) income (12,296 ) 2,925 (9,371 ) Balance at December 31, 2016 $ 1,639 (9,021 ) (7,382 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Basic and diluted earnings per share	Basic and diluted earnings per share has been computed based on the following: Years ended (Dollars in thousands, except per share data) December 31, December 31, December 31, Net income available to common stockholders, basic and diluted $ 121,131 116,127 112,755 Average outstanding shares - basic 76,278,463 75,542,455 74,641,957 Add: dilutive restricted stock awards 63,373 53,126 45,358 Average outstanding shares - diluted 76,341,836 75,595,581 74,687,315 Basic earnings per share $ 1.59 1.54 1.51 Diluted earnings per share $ 1.59 1.54 1.51

Parent Holding Company Inform47

Parent Holding Company Information (Condensed) (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Statements of Financial Condition	Condensed Statements of Financial Condition (Dollars in thousands) December 31, December 31, Assets Cash on hand and in banks $ 5,906 1,854 Interest bearing cash deposits 57,700 46,808 Cash and cash equivalents 63,606 48,662 Investment securities, available-for-sale 36 65 Other assets 10,764 11,553 Investment in subsidiaries 1,201,667 1,175,844 Total assets $ 1,276,073 1,236,124 Liabilities and Stockholders’ Equity Dividends payable $ 23,137 22,893 Subordinated debentures 125,991 125,848 Other liabilities 10,076 10,733 Total liabilities 159,204 159,474 Common stock 765 761 Paid-in capital 749,107 736,368 Retained earnings 374,379 337,532 Accumulated other comprehensive (loss) income (7,382 ) 1,989 Total stockholders’ equity 1,116,869 1,076,650 Total liabilities and stockholders’ equity $ 1,276,073 1,236,124
Condensed Statements of Operations and Comprehensive Income	Condensed Statements of Operations and Comprehensive Income Years ended (Dollars in thousands) December 31, December 31, December 31, Income Dividends from subsidiaries $ 108,350 109,000 78,500 Intercompany charges for services 12,248 10,562 9,283 Other income 311 196 199 Total income 120,909 119,758 87,982 Expenses Compensation and employee benefits 15,665 13,205 10,773 Other operating expenses 7,701 7,313 6,824 Total expenses 23,366 20,518 17,597 Income before income tax benefit and equity in undistributed net income of subsidiaries 97,543 99,240 70,385 Income tax benefit 4,040 3,105 2,919 Income before equity in undistributed net income of subsidiaries 101,583 102,345 73,304 Equity in undistributed net income of subsidiaries 19,548 13,782 39,451 Net Income $ 121,131 116,127 112,755 Comprehensive Income $ 111,760 100,372 120,854
Condensed Statements of Cash Flows	Condensed Statements of Cash Flows Years ended (Dollars in thousands) December 31, December 31, December 31, Operating Activities Net income $ 121,131 116,127 112,755 Adjustments to reconcile net income to net cash provided by operating activities: Subsidiary income in excess of dividends distributed (19,548 ) (13,782 ) (39,451 ) Excess tax benefits from stock-based compensation (8 ) (102 ) (138 ) Net change in other assets and other liabilities 507 307 140 Net cash provided by operating activities 102,082 102,550 73,306 Investing Activities Net decrease (increase) of premises and equipment 771 (1,405 ) (179 ) Net sale (purchase) of non-marketable equity securities 55 22 (667 ) Equity contributions to subsidiaries (3,475 ) (28,457 ) (18,115 ) Net cash used in by investing activities (2,649 ) (29,840 ) (18,961 ) Financing Activities Net increase in other borrowed funds 143 143 143 Cash dividends paid (84,040 ) (79,456 ) (50,944 ) Excess tax benefits from stock-based compensation 8 102 138 Stock-based compensation activity (600 ) 17 785 Net cash used in financing activities (84,489 ) (79,194 ) (49,878 ) Net increase (decrease) in cash and cash equivalents 14,944 (6,484 ) 4,467 Cash and cash equivalents at beginning of year 48,662 55,146 50,679 Cash and cash equivalents at end of year $ 63,606 48,662 55,146

Unaudited Quarterly Financial48

Unaudited Quarterly Financial Data (Condensed) (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Summarized unaudited quarterly financial data	Summarized unaudited quarterly financial data is as follows: Quarters ended 2016 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 84,381 86,069 85,944 87,759 Interest expense 7,675 7,424 7,318 7,214 Net interest income 76,706 78,645 78,626 80,545 Provision for loan losses 568 — 626 1,139 Net interest income after provision for loan losses 76,138 78,645 78,000 79,406 Non-interest income 24,252 26,759 28,293 28,014 Non-interest expense 62,356 64,461 65,180 66,717 Income before income taxes 38,034 40,943 41,113 40,703 Federal and state income tax expense 9,352 10,492 10,156 9,662 Net income $ 28,682 30,451 30,957 31,041 Basic earnings per share $ 0.38 0.40 0.40 0.41 Diluted earnings per share $ 0.38 0.40 0.40 0.41 Quarters ended 2015 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 77,486 78,617 80,367 83,211 Interest expense 7,382 7,369 7,309 7,215 Net interest income 70,104 71,248 73,058 75,996 Provision for loan losses 765 282 826 411 Net interest income after provision for loan losses 69,339 70,966 72,232 75,585 Non-interest income 22,693 25,802 25,799 24,467 Non-interest expense 55,497 59,945 59,112 62,203 Income before income taxes 36,535 36,823 38,919 37,849 Federal and state income tax expense 8,865 7,488 9,305 8,341 Net income $ 27,670 29,335 29,614 29,508 Basic earnings per share $ 0.37 0.39 0.39 0.39 Diluted earnings per share $ 0.37 0.39 0.39 0.39

Fair Value of Assets and Liab49

Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair value measurement of assets and liabilities measured at fair value on a recurring basis	The following tables disclose the fair value measurement of assets and liabilities measured at fair value on a recurring basis: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2016 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 U.S. government and federal agency $ 39,407 — 39,407 — U.S. government sponsored enterprises 19,570 — 19,570 — State and local governments 786,373 — 786,373 — Corporate bonds 471,951 — 471,951 — Mortgage-backed securities 1,108,176 — 1,108,176 — Total assets measured at fair value on a recurring basis $ 2,425,477 — 2,425,477 — Interest rate swaps $ 14,725 — 14,725 — Total liabilities measured at fair value on a recurring basis $ 14,725 — 14,725 — Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2015 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 U.S. government and federal agency $ 47,451 — 47,451 — U.S. government sponsored enterprises 93,167 — 93,167 — State and local governments 885,019 — 885,019 — Corporate bonds 384,163 — 384,163 — Mortgage-backed securities 1,200,960 — 1,200,960 — Total assets measured at fair value on a recurring basis $ 2,610,760 — 2,610,760 — Interest rate swaps $ 19,499 — 19,499 — Total liabilities measured at fair value on a recurring basis $ 19,499 — 19,499 —
Fair value measurement of assets measured at fair value on a non-recurring basis	The following tables disclose the fair value measurement of assets with a recorded change during the period resulting from re-measuring the assets at fair value on a non-recurring basis: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Other real estate owned $ 7,839 — — 7,839 Collateral-dependent impaired loans, net of ALLL 5,664 — — 5,664 Total assets measured at fair value on a non-recurring basis $ 13,503 — — 13,503 Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Fair Value December 31, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Other real estate owned $ 7,609 — — 7,609 Collateral-dependent impaired loans, net of ALLL 12,938 — — 12,938 Total assets measured at fair value on a non-recurring basis $ 20,547 — — 20,547
Quantitative information about assets measured at fair value on a non-recurring basis for which Level 3 inputs were used	The following tables present 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 value: Fair Value Quantitative Information about Level 3 Fair Value Measurements (Dollars in thousands) December 31, Valuation Technique Unobservable Input Range (Weighted- Average) 1 Other real estate owned $ 7,767 Sales comparison approach Selling costs 6.0% - 10.0% (6.9%) Adjustment to comparables 0.0% - 10.0% (0.1%) 72 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 10.0% - 10.0% (10.0%) $ 7,839 Collateral-dependent impaired loans, net of ALLL $ 110 Cost approach Selling costs 6.0% - 20.0% (6.6%) 1,982 Sales comparison approach Selling costs 8.0% - 10.0% (9.6%) 3,572 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 20.0% - 20.0% (20.0%) $ 5,664 Fair Value Quantitative Information about Level 3 Fair Value Measurements (Dollars in thousands) December 31, Valuation Technique Unobservable Input Range (Weighted- Average) 1 Other real estate owned $ 4,067 Sales comparison approach Selling costs 7.0% - 10.0% (7.9%) 3,542 Combined approach Selling costs 8.0% - 8.0% (8.0%) $ 7,609 Collateral-dependent impaired loans, net of ALLL $ 162 Cost approach Selling costs 0.0% - 20.0% (6.1%) 9,465 Sales comparison approach Selling costs 8.0% - 20.0% (8.9%) Adjustment to comparables 0.0% - 5.0% (0.0%) 3,311 Combined approach Selling costs 10.0% - 10.0% (10.0%) Adjustment to comparables 20.0% - 20.0% (20.0%) $ 12,938 __________ 1 The range for selling costs and adjustments to comparables indicate reductions to the fair value.
Carrying amounts and estimated fair values of financial instruments	The following tables present the carrying amounts, estimated fair values and the level within the fair value hierarchy of the Company’s financial instruments: Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Carrying Amount December 31, 2016 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 $ 152,541 152,541 — — Investment securities, available-for-sale 2,425,477 — 2,425,477 — Investment securities, held-to-maturity 675,674 — 689,089 — Loans held for sale 72,927 72,927 — — Loans receivable, net of ALLL 5,554,891 — 5,380,286 123,382 Accrued interest receivable 45,832 45,832 — — Non-marketable equity securities 25,550 — 25,550 — Total financial assets $ 8,952,892 271,300 8,520,402 123,382 Financial liabilities Deposits $ 7,372,279 6,090,879 1,283,532 — FHLB advances 251,749 — 257,643 — Repurchase agreements and other borrowed funds 478,090 — 478,090 — Subordinated debentures 125,991 — 85,557 — Accrued interest payable 3,584 3,584 — — Interest rate swaps 14,725 — 14,725 — Total financial liabilities $ 8,246,418 6,094,463 2,119,547 — Fair Value Measurements At the End of the Reporting Period Using (Dollars in thousands) Carrying Amount December 31, 2015 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 $ 193,253 193,253 — — Investment securities, available-for-sale 2,610,760 — 2,610,760 — Investment securities, held-to-maturity 702,072 — 729,513 — Loans held for sale 56,514 56,514 — — Loans receivable, net of ALLL 4,948,984 — 4,851,934 132,649 Accrued interest receivable 44,524 44,524 — — Non-marketable equity securities 27,495 — 27,495 — Total financial assets $ 8,583,602 294,291 8,219,702 132,649 Financial liabilities Deposits $ 6,945,008 5,654,638 1,293,506 — FHLB advances 394,131 — 401,530 — Repurchase agreements and other borrowed funds 430,016 — 430,016 — Subordinated debentures 125,848 — 81,840 — Accrued interest payable 3,517 3,517 — — Interest rate swaps 19,499 — 19,499 — Total financial liabilities $ 7,918,019 5,658,155 2,226,391 —

Contingencies and Commitments (

Contingencies and Commitments (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Outstanding commitments	The Company had the following outstanding commitments: (Dollars in thousands) December 31, December 31, Commitments to extend credit $ 1,325,236 1,240,923 Letters of credit 26,162 22,415 Total outstanding commitments $ 1,351,398 1,263,338

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Consideration transferred, identifiable net assets acquired and resulting goodwill	The following table discloses the calculation of the fair value of the consideration transferred, the total identifiable net assets acquired and the resulting goodwill arising from the TSB, Cañon and CB acquisitions: TSB Cañon CB (Dollars in thousands) August 31, October 31, February 28, Fair value of consideration transferred Fair value of Company shares issued, net of equity issuance costs $ 10,465 $ 15,163 10,776 Cash consideration for outstanding shares 3,475 16,145 12,219 Contingent consideration — — — Total fair value of consideration transferred 13,940 31,308 22,995 Recognized amounts of identifiable assets acquired and liabilities assumed Identifiable assets acquired Cash and cash equivalents 10,176 17,860 31,931 Investment securities — 68,486 42,350 Loans receivable 51,875 159,759 84,689 Core deposit intangible 1 762 4,532 2,087 Accrued income and other assets 6,937 9,689 13,580 Total identifiable assets acquired 69,750 260,326 174,637 Liabilities assumed Deposits 58,364 237,326 146,820 FHLB advances and repurchase agreements 3,260 — 3,292 Accrued expenses and other liabilities 601 1,487 2,667 Total liabilities assumed 62,225 238,813 152,779 Total identifiable net assets 7,525 21,513 21,858 Goodwill recognized $ 6,415 $ 9,795 1,137 ________ 1 The core deposit intangible for each acquisition was determined to have an estimated life of 10 years .
Unaudited Pro Forma Summary of the Company as if the Acquisitions had Occurred at the Beginning of the Period	The following unaudited pro forma summary presents consolidated information of the Company as if the TSB acquisition had occurred on January 1, 2015: Years ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income $ 424,242 392,252 Net income 120,929 116,577 The following unaudited pro forma summary presents consolidated information of the Company as if the Cañon and CB acquisition had occurred on January 1, 2014: Years ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income $ 401,140 383,387 Net income 115,613 115,899

Nature of Operations and Summ52

Nature of Operations and Summary of Significant Accounting Policies (Details Textual)		12 Months Ended
		Dec. 31, 2016USD ($)quarterstepoperating_segmentdivisionreporting_unit	Dec. 31, 2015USD ($)
Number of Bank Divisions | division		13
Number of Operating Segments | operating_segment		1
Total assets		$ 9,450,600,000	$ 9,089,232,000
Gross loans	[1]	$ 5,684,463,000	5,078,681,000
Maximum Period of Original Maturity to be Included in Cash and Cash Equivalents		3 months
Federal Reserve Balance or Cash on Hand Required		$ 4,169,000
Minimum Period Past Due to Consider Loans as Delinquent		30 days
Minimum Period Past Due to Consider Loans as Non Accrual		90 days
Number of Quarters Used to Evaluate Historical Loss Experience | quarter		12
Maximum period up to which purchase price of business is allocated to assets acquired and liabilities assumed		1 year
Number of Reporting Units Subsequent to Aggregation for Goodwill Assessment | reporting_unit		1
Number of steps included in goodwill impairment test | step		2
Bank Owned Life Insurance		$ 50,451,000	$ 49,534,000
Percentage of likelihood for term more likely than not		50.00%
Period to begin developing and implementing processes and procedures for FASB Update		2 years
Maximum lease term to not recognize lease assets and liabilities		12 months
Number of Steps to Achieve Core Revenue Recognition Principal | step		5
Consumer and Other
Minimum Number of Days Delinquent to Charge Off Loans		120 days
Minimum Range
Number of years for home equity loan origination term		10 years
Minimum Range | Office Buildings
Useful life of premises and equipment		15 years
Minimum Range | Furniture, fixtures and equipment
Useful life of premises and equipment		3 years
Maximum Range
Number of years for home equity loan origination term		15 years
Maximum Range | Office Buildings
Useful life of premises and equipment		40 years
Maximum Range | Furniture, fixtures and equipment
Useful life of premises and equipment		10 years
The Foothills Bank
Total assets		$ 334,792,000
Gross loans		279,777,000
Total deposits		$ 282,198,000
[1]	Includes net deferred fees, costs, premiums and discounts of $13,372,000 and $15,529,000 at December 31, 2016 and 2015, respectively.

Amortized Cost, Gross Unrealize

Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment Securities (Details) - USD ($)		Dec. 31, 2016	Dec. 31, 2015
Available-for-sale
Amortized Cost		$ 2,422,802,000	$ 2,588,013,000
Gross Unrealized Gains		24,960,000	41,065,000
Gross Unrealized Losses		(22,285,000)	(18,318,000)
Fair Value		2,425,477,000	2,610,760,000
Held-to-maturity
Amortized Cost		675,674,000	702,072,000
Gross Unrealized Gains		21,400,000	31,863,000
Gross Unrealized Losses		(7,985,000)	(4,422,000)
Fair Value		689,089,000	729,513,000
Total
Amortized Cost		3,098,476,000	3,290,085,000
Gross Unrealized Gains		46,360,000	72,928,000
Gross Unrealized Losses		(30,270,000)	(22,740,000)
Fair Value		3,114,566,000	3,340,273,000
U.S. government and federal agency
Available-for-sale
Amortized Cost		39,554,000	47,868,000
Gross Unrealized Gains		15,000	15,000
Gross Unrealized Losses		(162,000)	(432,000)
Fair Value		39,407,000	47,451,000
U.S. government sponsored enterprises
Available-for-sale
Amortized Cost		19,557,000	93,230,000
Gross Unrealized Gains		55,000	100,000
Gross Unrealized Losses		(42,000)	(163,000)
Fair Value		19,570,000	93,167,000
State and local governments
Available-for-sale
Amortized Cost		775,395,000	856,738,000
Gross Unrealized Gains		20,941,000	34,159,000
Gross Unrealized Losses		(9,963,000)	(5,878,000)
Fair Value		786,373,000	885,019,000
Held-to-maturity
Amortized Cost		675,674,000	702,072,000
Gross Unrealized Gains		21,400,000	31,863,000
Gross Unrealized Losses		(7,985,000)	(4,422,000)
Fair Value		689,089,000	729,513,000
Corporate bonds
Available-for-sale
Amortized Cost		471,569,000	386,629,000
Gross Unrealized Gains		1,175,000	611,000
Gross Unrealized Losses		(793,000)	(3,077,000)
Fair Value		471,951,000	384,163,000
Mortgage-backed securities
Available-for-sale
Amortized Cost		1,116,727,000	1,203,548,000
Gross Unrealized Gains		2,774,000	6,180,000
Gross Unrealized Losses		(11,325,000)	(8,768,000)
Fair Value	[1]	1,108,176,000	1,200,960,000
Residential mortgage backed securities
Available-for-sale
Fair Value		1,011,252,000	1,200,503,000
Commercial mortgage backed securities
Available-for-sale
Fair Value		$ 96,924,000	$ 457,000
[1]	Consists of residential mortgage-backed securities with fair values of $1,011,252,000 and $1,200,503,000 at December 31, 2016 and 2015, respectively, and commercial mortgage-backed securities, with fair values of $96,924,000 and $457,000 at December 31, 2016 and 2015, respectively.

Investment Securities Investmen

Investment Securities Investment Securities Maturity Schedule (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Available-for-Sale, Amortized Cost
Due within one year		$ 149,379
Due after one year through five years		437,896
Due after five years through ten years		197,462
Due after ten years		521,338
Total before mortgage-backed securities		1,306,075
Total		2,422,802	$ 2,588,013
Available-for-Sale, Fair Value
Due with one year		149,650
Due after one year through five years		438,650
Due after five years through ten years		200,654
Due after ten years		528,347
Total before mortgage-backed securities		1,317,301
Total		2,425,477	2,610,760
Held-to-Maturity, Amortized Cost
Due within one year		0
Due after one year through five years		594
Due after five years through ten years		55,310
Due after ten years		619,770
Total before mortgage-backed securities		675,674
Amortized Cost		675,674	702,072
Held-to-Maturity, Fair Value
Due within one year		0
Due after one year through five years		597
Due after five years through ten years		56,048
Due after ten years		632,444
Total before mortgage-backed securities		689,089
Total		689,089	729,513
Mortgage-backed securities
Available-for-Sale, Amortized Cost
Mortgage-backed securities	[1]	1,116,727
Total		1,116,727	1,203,548
Available-for-Sale, Fair Value
Mortgage-backed securities	[1]	1,108,176
Total	[2]	1,108,176	$ 1,200,960
Held-to-Maturity, Amortized Cost
Mortgage-backed securities	[1]	0
Held-to-Maturity, Fair Value
Mortgage-backed securities	[1]	$ 0
[1]	Mortgage-backed securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds.
[2]	Consists of residential mortgage-backed securities with fair values of $1,011,252,000 and $1,200,503,000 at December 31, 2016 and 2015, respectively, and commercial mortgage-backed securities, with fair values of $96,924,000 and $457,000 at December 31, 2016 and 2015, respectively.

Gain or Loss on Sale of Investm

Gain or Loss on Sale of Investments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale
Proceeds from sales and calls of investment securities		$ 212,140	$ 167,660	$ 219,849
Gross realized gains	[1]	2,459	1,877	501
Gross realized losses	[1]	(3,794)	(1,808)	(705)
Held-to-maturity
Proceeds from calls of investment securities		25,405	20,997	8,930
Gross realized gains	[1]	97	50	22
Gross realized losses	[1]	$ (225)	$ (100)	$ (6)
[1]	The gain or loss on the sale or call of each investment security is determined by the specific identification method.

Investments with an Unrealized

Investments with an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale, Fair Value
Less than 12 Months	$ 1,188,397	$ 1,163,595
12 Months or More	144,120	182,928
Total	1,332,517	1,346,523
Available-for-sale, Unrealized Loss
Less than 12 Months	(16,446)	(11,262)
12 Months or Longer	(5,839)	(7,056)
Total	(22,285)	(18,318)
Held-to-maturity, Fair Value
Less than 12 Months	117,912	42,322
12 Months or More	86,601	81,709
Total	204,513	124,031
Held-to-maturity, Unrealized Loss
Less than 12 Months	(1,712)	(594)
12 Months or More	(6,273)	(3,828)
Total	(7,985)	(4,422)
U.S. government and federal agency
Available-for-sale, Fair Value
Less than 12 Months	6,718	42,493
12 Months or More	26,239	2
Total	32,957	42,495
Available-for-sale, Unrealized Loss
Less than 12 Months	(24)	(432)
12 Months or Longer	(138)	0
Total	(162)	(432)
U.S. government sponsored enterprises
Available-for-sale, Fair Value
Less than 12 Months	6,049	60,010
12 Months or More	0	0
Total	6,049	60,010
Available-for-sale, Unrealized Loss
Less than 12 Months	(42)	(163)
12 Months or Longer	0	0
Total	(42)	(163)
State and local governments
Available-for-sale, Fair Value
Less than 12 Months	222,700	102,422
12 Months or More	81,783	115,943
Total	304,483	218,365
Available-for-sale, Unrealized Loss
Less than 12 Months	(4,949)	(1,629)
12 Months or Longer	(5,014)	(4,249)
Total	(9,963)	(5,878)
Held-to-maturity, Fair Value
Less than 12 Months	117,912	42,322
12 Months or More	86,601	81,709
Total	204,513	124,031
Held-to-maturity, Unrealized Loss
Less than 12 Months	(1,712)	(594)
12 Months or More	(6,273)	(3,828)
Total	(7,985)	(4,422)
Corporate bonds
Available-for-sale, Fair Value
Less than 12 Months	174,821	228,258
12 Months or More	6,141	13,962
Total	180,962	242,220
Available-for-sale, Unrealized Loss
Less than 12 Months	(774)	(1,812)
12 Months or Longer	(19)	(1,265)
Total	(793)	(3,077)
Mortgage-backed securities
Available-for-sale, Fair Value
Less than 12 Months	778,109	730,412
12 Months or More	29,957	53,021
Total	808,066	783,433
Available-for-sale, Unrealized Loss
Less than 12 Months	(10,657)	(7,226)
12 Months or Longer	(668)	(1,542)
Total	$ (11,325)	$ (8,768)

Investment Securities (Details

Investment Securities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment securities pledged as collateral	$ 1,878,739,000	$ 1,824,819,000
Other-than-temporary impairment on investment securities	$ 0	$ 0

Loans Receivable, Net Summary o

Loans Receivable, Net Summary of Loans Receivable (Details) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Summary of Loans Receivable
Loans receivable	[1]	$ 5,684,463,000	$ 5,078,681,000
Allowance for loan and lease losses		(129,572,000)	(129,697,000)
Loans receivable, net		$ 5,554,891,000	$ 4,948,984,000
Weighted-average interest rate on loans (tax-equivalent)		4.77%	4.84%
Net deferred fees, costs, premiums, and discounts included in loans receivable		$ 13,372,000	$ 15,529,000
Residential Real Estate | Residential Real Estate
Summary of Loans Receivable
Loans receivable		674,347,000	688,912,000
Allowance for loan and lease losses		(12,436,000)	(14,427,000)
Commercial
Summary of Loans Receivable
Loans receivable		4,332,391,000	3,733,517,000
Commercial | Commercial Real Estate
Summary of Loans Receivable
Loans receivable		2,990,141,000	2,633,953,000
Allowance for loan and lease losses		(65,773,000)	(67,877,000)
Commercial | Other Commercial
Summary of Loans Receivable
Loans receivable		1,342,250,000	1,099,564,000
Allowance for loan and lease losses		(37,823,000)	(32,525,000)
Consumer and Other
Summary of Loans Receivable
Loans receivable		677,725,000	656,252,000
Consumer and Other | Home Equity
Summary of Loans Receivable
Loans receivable		434,774,000	420,901,000
Allowance for loan and lease losses		(7,572,000)	(8,998,000)
Consumer and Other | Other Consumer
Summary of Loans Receivable
Loans receivable		242,951,000	235,351,000
Allowance for loan and lease losses		$ (5,968,000)	$ (5,870,000)
[1]	Includes net deferred fees, costs, premiums and discounts of $13,372,000 and $15,529,000 at December 31, 2016 and 2015, respectively.

ALLL Activity (Details)

ALLL Activity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for loan and lease losses
Balance at beginning of period				$ 129,697				$ 129,753	$ 129,697	$ 129,753	$ 130,351
Provision for loan losses	$ 1,139	$ 626	$ 0	568	$ 411	$ 826	$ 282	765	2,333	2,284	1,912
Charge-offs									(11,496)	(7,002)	(7,603)
Recoveries									9,038	4,662	5,093
Balance at end of period	129,572				129,697				129,572	129,697	129,753
Residential Real Estate | Residential Real Estate
Allowance for loan and lease losses
Balance at beginning of period				14,427				14,680	14,427	14,680	14,067
Provision for loan losses									(1,734)	640	716
Charge-offs									(464)	(985)	(431)
Recoveries									207	92	328
Balance at end of period	12,436				14,427				12,436	14,427	14,680
Commercial | Commercial Real Estate
Allowance for loan and lease losses
Balance at beginning of period				67,877				67,799	67,877	67,799	70,332
Provision for loan losses									(2,686)	(696)	(2,877)
Charge-offs									(3,082)	(1,920)	(1,802)
Recoveries									3,664	2,694	2,146
Balance at end of period	65,773				67,877				65,773	67,877	67,799
Commercial | Other Commercial
Allowance for loan and lease losses
Balance at beginning of period				32,525				30,891	32,525	30,891	28,630
Provision for loan losses									4,835	3,030	3,708
Charge-offs									(1,144)	(2,322)	(3,058)
Recoveries									1,607	926	1,611
Balance at end of period	37,823				32,525				37,823	32,525	30,891
Consumer and Other | Home Equity
Allowance for loan and lease losses
Balance at beginning of period				8,998				9,963	8,998	9,963	9,299
Provision for loan losses									(520)	(480)	1,254
Charge-offs									(1,185)	(809)	(1,038)
Recoveries									279	324	448
Balance at end of period	7,572				8,998				7,572	8,998	9,963
Consumer and Other | Other Consumer
Allowance for loan and lease losses
Balance at beginning of period				$ 5,870				$ 6,420	5,870	6,420	8,023
Provision for loan losses									2,438	(210)	(889)
Charge-offs									(5,621)	(966)	(1,274)
Recoveries									3,281	626	560
Balance at end of period	$ 5,968				$ 5,870				$ 5,968	$ 5,870	$ 6,420

Loans Receivable, Net ALLL and

Loans Receivable, Net ALLL and Loans Receivable Summary (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment		$ 6,881	$ 8,124
Collectively evaluated for impairment		122,691	121,573
Total allowance for loan and lease losses		129,572	129,697
Individually evaluated for impairment		130,263	140,773
Collectively evaluated for impairment		5,554,200	4,937,908
Total loans receivable	[1]	5,684,463	5,078,681
Residential Real Estate | Residential Real Estate
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment		856	782
Collectively evaluated for impairment		11,580	13,645
Total allowance for loan and lease losses		12,436	14,427
Individually evaluated for impairment		11,612	20,767
Collectively evaluated for impairment		662,735	668,145
Total loans receivable		674,347	688,912
Commercial
Allowance for Loan and Lease Losses and Loans Receivable
Total loans receivable		4,332,391	3,733,517
Commercial | Commercial Real Estate
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment		922	1,629
Collectively evaluated for impairment		64,851	66,248
Total allowance for loan and lease losses		65,773	67,877
Individually evaluated for impairment		85,634	85,845
Collectively evaluated for impairment		2,904,507	2,548,108
Total loans receivable		2,990,141	2,633,953
Commercial | Other Commercial
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment		4,419	5,277
Collectively evaluated for impairment		33,404	27,248
Total allowance for loan and lease losses		37,823	32,525
Individually evaluated for impairment		23,950	23,874
Collectively evaluated for impairment		1,318,300	1,075,690
Total loans receivable		1,342,250	1,099,564
Consumer and Other
Allowance for Loan and Lease Losses and Loans Receivable
Total loans receivable		677,725	656,252
Consumer and Other | Home Equity
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment		296	64
Collectively evaluated for impairment		7,276	8,934
Total allowance for loan and lease losses		7,572	8,998
Individually evaluated for impairment		5,934	6,493
Collectively evaluated for impairment		428,840	414,408
Total loans receivable		434,774	420,901
Consumer and Other | Other Consumer
Allowance for Loan and Lease Losses and Loans Receivable
Individually evaluated for impairment		388	372
Collectively evaluated for impairment		5,580	5,498
Total allowance for loan and lease losses		5,968	5,870
Individually evaluated for impairment		3,133	3,794
Collectively evaluated for impairment		239,818	231,557
Total loans receivable		$ 242,951	$ 235,351
[1]	Includes net deferred fees, costs, premiums and discounts of $13,372,000 and $15,529,000 at December 31, 2016 and 2015, respectively.

Impaired Loans (Details)

Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	$ 22,128	$ 34,683
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	22,374	36,157
Specific valuation allowance	6,881	8,124
Loans with a Specific Valuation Allowance, Average Balance	26,745	36,176
Loans without a Specific Valuation Allowance, Recorded Balance	108,135	106,090
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	131,059	132,718
Loans without a Specific Valuation Allowance, Average Balance	108,827	116,356
Recorded balance	130,263	140,773
Unpaid principal balance	153,433	168,875
Average balance	135,572	152,532
Residential Real Estate | Residential Real Estate
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	2,759	8,253
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	2,825	9,198
Specific valuation allowance	856	782
Loans with a Specific Valuation Allowance, Average Balance	4,942	6,393
Loans without a Specific Valuation Allowance, Recorded Balance	8,853	12,514
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	9,925	13,969
Loans without a Specific Valuation Allowance, Average Balance	12,858	13,615
Recorded balance	11,612	20,767
Unpaid principal balance	12,750	23,167
Average balance	17,800	20,008
Commercial | Commercial Real Estate
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	9,129	12,554
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	9,130	12,581
Specific valuation allowance	922	1,629
Loans with a Specific Valuation Allowance, Average Balance	10,441	15,827
Loans without a Specific Valuation Allowance, Recorded Balance	76,505	73,291
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	94,180	94,028
Loans without a Specific Valuation Allowance, Average Balance	72,323	78,684
Recorded balance	85,634	85,845
Unpaid principal balance	103,310	106,609
Average balance	82,764	94,511
Commercial | Other Commercial
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	8,814	11,923
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	8,929	12,335
Specific valuation allowance	4,419	5,277
Loans with a Specific Valuation Allowance, Average Balance	9,840	11,768
Loans without a Specific Valuation Allowance, Recorded Balance	15,136	11,951
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	17,724	15,539
Loans without a Specific Valuation Allowance, Average Balance	15,537	15,479
Recorded balance	23,950	23,874
Unpaid principal balance	26,653	27,874
Average balance	25,377	27,247
Consumer and Other | Home Equity
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	334	102
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	345	109
Specific valuation allowance	296	64
Loans with a Specific Valuation Allowance, Average Balance	257	426
Loans without a Specific Valuation Allowance, Recorded Balance	5,600	6,391
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	7,120	7,153
Loans without a Specific Valuation Allowance, Average Balance	6,004	6,350
Recorded balance	5,934	6,493
Unpaid principal balance	7,465	7,262
Average balance	6,261	6,776
Consumer and Other | Other Consumer
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	1,092	1,851
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	1,145	1,934
Specific valuation allowance	388	372
Loans with a Specific Valuation Allowance, Average Balance	1,265	1,762
Loans without a Specific Valuation Allowance, Recorded Balance	2,041	1,943
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	2,110	2,029
Loans without a Specific Valuation Allowance, Average Balance	2,105	2,228
Recorded balance	3,133	3,794
Unpaid principal balance	3,255	3,963
Average balance	$ 3,370	$ 3,990

Loans Receivable Aging Analysis

Loans Receivable Aging Analysis (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Loan portfolio aging analysis
Non-accrual loans		$ 49,332	$ 51,133
Total past due and non-accrual loans		76,048	72,677
Current loans receivable		5,608,415	5,006,004
Total loans receivable	[1]	5,684,463	5,078,681
Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans		20,599	15,801
Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans		5,018	3,612
Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans		1,099	2,131
Residential Real Estate | Residential Real Estate
Loan portfolio aging analysis
Non-accrual loans		4,528	8,073
Total past due and non-accrual loans		12,530	13,929
Current loans receivable		661,817	674,983
Total loans receivable		674,347	688,912
Residential Real Estate | Residential Real Estate | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans		6,338	4,895
Residential Real Estate | Residential Real Estate | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans		1,398	961
Residential Real Estate | Residential Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans		266	0
Commercial
Loan portfolio aging analysis
Total loans receivable		4,332,391	3,733,517
Commercial | Commercial Real Estate
Loan portfolio aging analysis
Non-accrual loans		30,216	28,819
Total past due and non-accrual loans		36,194	35,284
Current loans receivable		2,953,947	2,598,669
Total loans receivable		2,990,141	2,633,953
Commercial | Commercial Real Estate | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans		5,079	4,393
Commercial | Commercial Real Estate | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans		754	1,841
Commercial | Commercial Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans		145	231
Commercial | Other Commercial
Loan portfolio aging analysis
Non-accrual loans		8,817	7,691
Total past due and non-accrual loans		15,840	13,361
Current loans receivable		1,326,410	1,086,203
Total loans receivable		1,342,250	1,099,564
Commercial | Other Commercial | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans		5,388	3,564
Commercial | Other Commercial | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans		1,352	286
Commercial | Other Commercial | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans		283	1,820
Consumer and Other
Loan portfolio aging analysis
Total loans receivable		677,725	656,252
Consumer and Other | Home Equity
Loan portfolio aging analysis
Non-accrual loans		5,240	6,022
Total past due and non-accrual loans		8,714	7,918
Current loans receivable		426,060	412,983
Total loans receivable		434,774	420,901
Consumer and Other | Home Equity | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans		2,439	1,601
Consumer and Other | Home Equity | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans		844	280
Consumer and Other | Home Equity | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans		191	15
Consumer and Other | Other Consumer
Loan portfolio aging analysis
Non-accrual loans		531	528
Total past due and non-accrual loans		2,770	2,185
Current loans receivable		240,181	233,166
Total loans receivable		242,951	235,351
Consumer and Other | Other Consumer | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans		1,355	1,348
Consumer and Other | Other Consumer | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans		670	244
Consumer and Other | Other Consumer | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans		$ 214	$ 65
[1]	Includes net deferred fees, costs, premiums and discounts of $13,372,000 and $15,529,000 at December 31, 2016 and 2015, respectively.

Troubled Debt Restructurings (D

Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)Loan	Dec. 31, 2015USD ($)Loan	Dec. 31, 2014USD ($)Loan
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	34	64	51
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 22,907	$ 22,316	$ 37,781
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 22,848	$ 23,110	$ 37,075
TDRs that Subsequently Defaulted, Number of Loans | Loan	1	7	5
TDRs that Subsequently Defaulted, Recorded Balance	$ 6	$ 2,556	$ 4,453
Residential Real Estate | Residential Real Estate
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	0	3	0
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 0	$ 2,259	$ 0
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 0	$ 2,203	$ 0
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	1	0
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 1,947	$ 0
Commercial | Commercial Real Estate
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	10	25	18
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 8,454	$ 8,877	$ 21,760
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 8,415	$ 9,927	$ 21,803
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	1	2
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 78	$ 927
Commercial | Other Commercial
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	21	22	24
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 14,183	$ 10,545	$ 12,522
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 14,166	$ 10,325	$ 11,884
TDRs that Subsequently Defaulted, Number of Loans | Loan	1	4	1
TDRs that Subsequently Defaulted, Recorded Balance	$ 6	$ 529	$ 693
Consumer and Other | Home Equity
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	3	1	6
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 270	$ 137	$ 3,385
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 267	$ 157	$ 3,274
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	0	2
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 0	$ 2,833
Consumer and Other | Other Consumer
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	0	13	3
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 0	$ 498	$ 114
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 0	$ 498	$ 114
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	1	0
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 2	$ 0

Loans Receivable, Net (Details

Loans Receivable, Net (Details Textual)	12 Months Ended
	Dec. 31, 2016USD ($)portfolio_segment	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Loans Receivable
Number of segments in the Company's loan portfolio | portfolio_segment	3
Percentage of consolidated stockholders equity exceeding which no borrower had outstanding loans or commitments	10.00%
Variable rate loans	$ 3,585,328,000
Fixed rate loans	2,099,135,000
Loans pledged as collateral	3,242,380,000
Aggregate amount of loans outstanding to related parties	58,438,000	$ 53,233,000
New loans to related parties	10,272,000
Repayments of loans by related parties	9,172,000
Loans and Leases Receivable Related Parties, Change in Composition	4,105,000
Interest income that would have been recorded on non-accrual loans	2,364,000	2,471,000	$ 3,005,000
TDR With Pre Modification Loan Balance for Which Oreo Was Received	5,331,000	8,893,000	12,674,000
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process	1,770,000	3,253,000
OREO Secured by Residential Real Estate	2,699,000	1,496,000
Additional unfunded commitments on TDRs	4,785,000	2,803,000
Charge-offs on TDRs	$ 557,000	$ 1,310,000	$ 1,361,000

Premises and Equipment, Net of

Premises and Equipment, Net of Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Premises and Equipment, Net of Accumulated Depreciation
Accumulated depreciation	$ (119,748)	$ (110,696)
Premises and equipment, net	176,198	194,030
Land
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	29,648	30,108
Office buildings and construction in progress
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	173,886	187,787
Furniture, fixtures and equipment
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	84,559	78,803
Leasehold improvements
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	$ 7,853	$ 8,028

Premises and Equipment Future M

Premises and Equipment Future Minimum Rental Commitments under Operating and Capital Leases (Details) $ in Thousands	Dec. 31, 2016USD ($)
Capital Leases
For the Year Ended December 31, 2017	$ 92
For the Year Ended December 31, 2018	92
For the Year Ended December 31, 2019	92
For the Year Ended December 31, 2020	92
For the Year Ended December 31, 2021	11
Thereafter	0
Total minimum lease payments	379
Less: Amount representing interest	44
Present value of minimum lease payments	335
Less: Current portion of obligations under capital leases	75
Long-term portion of obligations under capital leases	260
Operating Leases
For the Year Ended December 31, 2017	2,387
For the Year Ended December 31, 2018	2,146
For the Year Ended December 31, 2019	1,960
For the Year Ended December 31, 2020	1,548
For the Year Ended December 31, 2021	1,111
Thereafter	3,905
Total Minimum Lease Payments	13,057
Total
For the Year Ended December 31, 2017	2,479
For the Year Ended December 31, 2018	2,238
For the Year Ended December 31, 2019	2,052
For the Year Ended December 31, 2020	1,640
For the Year Ended December 31, 2021	1,122
Thereafter	3,905
Total Minimum Lease Payments	$ 13,436

Premises and Equipment (Details

Premises and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Premises and Equipment
Depreciation expense	$ 15,294,000	$ 14,365,000	$ 12,108,000
Total rent expense	3,255,000	3,137,000	2,786,000
Related party rent expense	$ 153,000	$ 150,000	$ 146,000

Net Carrying Value of Core Depo

Net Carrying Value of Core Deposit Intangibles (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Core Deposit Intangibles and Aggregate Amortization Expense
Net carrying value	$ 12,347,000	$ 14,555,000
Aggregate amortization expense	2,970,000	2,964,000	$ 2,811,000
Core Deposits Intangibles
Net Core Deposit Intangibles and Aggregate Amortization Expense
Gross carrying value	34,742,000	38,527,000	32,056,000
Accumulated amortization	(22,395,000)	(23,972,000)	(21,156,000)
Net carrying value	12,347,000	14,555,000	10,900,000
Aggregate amortization expense	2,970,000	2,964,000	2,811,000
Estimated Amortization Expense
For the year ending December 31, 2017	2,161,000
For the year ending December 31, 2018	1,718,000
For the year ending December 31, 2019	1,618,000
For the year ending December 31, 2020	1,557,000
For the year ending December 31, 2021	1,497,000
Core Deposit Intangibles Acquired During the Year
Core Deposit Intangibles Acquired	$ 762,000	$ 6,619,000	$ 4,199,000
Core Deposits Intangibles | Weighted Average
Net Core Deposit Intangibles and Aggregate Amortization Expense
Weighted-average amortization period	9 years 7 months

Changes in the Carrying Value o

Changes in the Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill Roll Forward
Net carrying value at beginning of period	$ 140,638	$ 129,706	$ 129,706
Acquisitions	6,415	10,932	0
Net carrying value at end of period	$ 147,053	$ 140,638	$ 129,706

Other Intangible Assets and G70

Other Intangible Assets and Goodwill Net Carrying Value of Goodwill (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gross carrying value of goodwill and the accumulated impairment charge
Gross carrying value		$ 187,212	$ 180,797
Accumulated impairment charge	[1]	(40,159)	(40,159)
Net carrying value		$ 147,053	$ 140,638	$ 129,706	$ 129,706
[1]	A goodwill impairment charge was recognized in 2011 and was due to high levels of volatility and dislocation in bank stock prices nationwide.

Variable Interest Entities VIE

Variable Interest Entities VIE Carrying Amounts Included in Financial Statements (Details) - Consolidated VIEs - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Consolidated VIEs
Assets	$ 39,054	$ 72,175
Liabilities	4,134	6,343
Loans Receivable
Consolidated VIEs
Assets	36,950	57,126
Premises and Equipment, Net
Consolidated VIEs
Assets	0	13,503
Accrued Interest Receivable
Consolidated VIEs
Assets	120	117
Other Assets
Consolidated VIEs
Assets	1,984	1,429
Other Borrowed Funds
Consolidated VIEs
Liabilities	4,105	6,195
Accrued Interest Payable
Consolidated VIEs
Liabilities	2	9
Other Liabilities
Consolidated VIEs
Liabilities	$ 27	$ 139

Variable Interest Entities Amor

Variable Interest Entities Amortization Expense and Tax Credits and Other Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments in Qualified Affordable Housing Projects
Amortization expense	$ 1,079	$ 1,175	$ 1,270
Tax credits and other tax benefits recognized	$ 436	$ 377	$ 419

Variable Interest Entities (Det

Variable Interest Entities (Details Textual)	12 Months Ended
	Dec. 31, 2016USD ($)
Variable Interest Entities
Unfunded contingent commitments	$ 19,933,000
Year in which commitments will be fulfilled	2,017
Impairment losses	$ 0
Other assets
Variable Interest Entities
Carrying value of equity investments in LIHTCs	$ 7,282,000
CDE
Variable Interest Entities
Tax credit period	7 years
LIHTC
Variable Interest Entities
Tax credit period	10 years
Tax credit compliance period	15 years

Scheduled Maturities of Time De

Scheduled Maturities of Time Deposits (Details) $ in Thousands	Dec. 31, 2016USD ($)
Maturities of Time Deposits
For the year ending December 31, 2017	$ 644,881
For the year ending December 31, 2018	149,557
For the year ending December 31, 2019	69,782
For the year ending December 31, 2020	39,756
For the year ending December 31, 2021	44,159
Thereafter	579
Total	$ 948,714

Deposits (Details Textual)

Deposits (Details Textual) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Deposits
FDIC Insurance limit	$ 250,000
Time deposits that meet or exceed FDIC Insurance limit	254,611,000	$ 258,573,000
Overdraft demand deposits reclassified as loans	3,618,000	2,966,000
Deposits with related parties	$ 27,977,000	$ 21,818,000

Borrowings Summary of Repurchas

Borrowings Summary of Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	$ 473,650	$ 423,414
Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase Agreements		420,967
Up to 30 Days
Securities Sold Under Agreements to Repurchase
Repurchase Agreements		2,447
U.S. government sponsored enterprises
Securities Sold Under Agreements to Repurchase
Repurchase Agreements		12,507
U.S. government sponsored enterprises | Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase Agreements		12,507
U.S. government sponsored enterprises | Up to 30 Days
Securities Sold Under Agreements to Repurchase
Repurchase Agreements		0
Mortgage-backed securities
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	473,650	410,907
Mortgage-backed securities | Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	473,007	408,460
Mortgage-backed securities | Up to 30 Days
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	$ 643	$ 2,447

Scheduled Maturities of FHLB Ad

Scheduled Maturities of FHLB Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
FHLB Advances
Maturing within one year, Amount	$ 41,099	$ 185,091
Maturing within one year, Weighted rate	0.84%	1.02%
Maturing one year through two years, Amount	$ 70,983	$ 179
Maturing one year through two years, Weighted rate	1.42%	4.19%
Maturing two years through three years, Amount	$ 927	$ 70,597
Maturing two years through three years, Weighted rate	2.16%	1.01%
Maturing three years through four years, Amount	$ 1,728	$ 167
Maturing three years through four years, Weighted rate	3.66%	3.79%
Maturing four years through five years, Amount	$ 135,000	$ 945
Maturing four years through five years, Weighted rate	3.08%	4.98%
Thereafter, Amount	$ 2,012	$ 137,152
Thereafter, Weighted rate	5.33%	3.12%
Total, Amount	$ 251,749	$ 394,131
Total, Weighted rate	2.27%	1.76%

Borrowings (Details Textual)

Borrowings (Details Textual) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Borrowings
Repurchase Agreements	$ 473,650,000	$ 423,414,000
Securities Pledged for Repurchase Agreements	472,239,000	446,838,000
FHLB advances	251,749,000	$ 394,131,000
Lines of credit	255,000,000
FHLB Put Options
Borrowings
FHLB advances	$ 155,000,000
Minimum rate to exercise put option	8.00%
FHLB Advances, Due Date, Earliest	2,018
FHLB Advances, Due Date, Last	2,021
FHLB Put Options | Minimum Range
Borrowings
FHLB Advances, Interest Rate	2.73%
FHLB Put Options | Maximum Range
Borrowings
FHLB Advances, Interest Rate	3.43%

Subordinated Debentures (Detail

Subordinated Debentures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Terms of Subordinated Debentures
Balance	$ 125,991	$ 125,848
First Company Statutory Trust 2001
Terms of Subordinated Debentures
Balance	$ 3,207
Rate at December 31, 2016	4.187%
Variable Rate Structure	3 mo LIBOR plus 3.30%
LIBOR Rate Spread	3.30%
Maturity Date	Jul. 31, 2031
First Company Statutory Trust 2003
Terms of Subordinated Debentures
Balance	$ 2,361
Rate at December 31, 2016	4.247%
Variable Rate Structure	3 mo LIBOR plus 3.25%
LIBOR Rate Spread	3.25%
Maturity Date	Mar. 26, 2033
Glacier Capital Trust II
Terms of Subordinated Debentures
Balance	$ 46,393
Rate at December 31, 2016	3.63%
Variable Rate Structure	3 mo LIBOR plus 2.75%
LIBOR Rate Spread	2.75%
Maturity Date	Apr. 7, 2034
Citizens (ID) Statutory Trust I
Terms of Subordinated Debentures
Balance	$ 5,155
Rate at December 31, 2016	3.643%
Variable Rate Structure	3 mo LIBOR plus 2.65%
LIBOR Rate Spread	2.65%
Maturity Date	Jun. 17, 2034
Glacier Capital Trust III
Terms of Subordinated Debentures
Balance	$ 36,083
Rate at December 31, 2016	2.17%
Variable Rate Structure	3 mo LIBOR plus 1.29%
LIBOR Rate Spread	1.29%
Maturity Date	Apr. 7, 2036
Glacier Capital Trust IV
Terms of Subordinated Debentures
Balance	$ 30,928
Rate at December 31, 2016	2.533%
Variable Rate Structure	3 mo LIBOR plus 1.57%
LIBOR Rate Spread	1.57%
Maturity Date	Sep. 15, 2036
Bank of the San Juans Bancorporation Trust I
Terms of Subordinated Debentures
Balance	$ 1,864
Rate at December 31, 2016	2.751%
Variable Rate Structure	3 mo LIBOR plus 1.82%
LIBOR Rate Spread	1.82%
Maturity Date	Mar. 1, 2037

Subordinated Debentures (Deta80

Subordinated Debentures (Details Textual)	12 Months Ended
	Dec. 31, 2016
Debt Instruments [Abstract]
Maximum Number of Consecutive Quarters for Deferral of Interest Payments on Trust Preferred Securities	20
Size of company eligible for Tier 1 grandfather provision	15,000,000,000

Interest Rate Swap Summary (Det

Interest Rate Swap Summary (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Interest Rate Swap One
Interest rate swap derivative financial instruments
Forecasted Notional Amount	$ 160,000
Variable Interest Rate	3 month LIBOR	[1]
Fixed Interest Rate	3.378%	[1]
Term, Effective Date	Oct. 21, 2014
Term, Maturity Date	Oct. 21, 2021
Interest Rate Swap Two
Interest rate swap derivative financial instruments
Forecasted Notional Amount	$ 100,000
Variable Interest Rate	3 month LIBOR	[1]
Fixed Interest Rate	2.498%	[1]
Term, Effective Date	Nov. 30, 2015
Term, Maturity Date	Nov. 30, 2022
[1]	The Company pays the fixed interest rate and the counterparty pays the Company the variable interest rate.

Derivatives and Hedging Activ82

Derivatives and Hedging Activities Interest Rate Swap Gains or Losses (Details) - Interest Rate Swap - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Expense
Pre-Tax Gains or Losses
Amount of loss reclassified from OCI to interest expense	$ (6,417)	$ (5,025)	$ (993)
Other Non-Interest Expense
Pre-Tax Gains or Losses
Amount of loss recognized in other non-interest expense (ineffective portion)	0	0	0
Other Comprehensive Income
Pre-Tax Gains or Losses
Amount of gain (loss) recognized in OCI (effective portion)	$ (1,643)	$ (7,857)	$ (19,557)

Derivatives and Hedging Activ83

Derivatives and Hedging Activities Offsetting Assets (Details) - Interest Rate Swap - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Offsetting Derivative Assets
Gross Amounts of Recognized Assets	$ 0	$ 0
Gross Amounts Offset in the Statements of Financial Position	0	0
Net Amounts of Assets Presented in the Statements of Financial Position	$ 0	$ 0

Derivatives and Hedging Activ84

Derivatives and Hedging Activities Offsetting Liabilities (Details) - Interest Rate Swap - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Offsetting Derivative Liabilities
Gross Amounts of Recognized Liabilities	$ 14,725	$ 19,499
Gross Amounts Offset in the Statements of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statements of Financial Position	$ 14,725	$ 19,499

Derivatives and Hedging Activ85

Derivatives and Hedging Activities Derivatives and Hedging Activities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest rate swap derivative financial instruments
Investment securities pledged as collateral	$ 1,878,739,000	$ 1,824,819,000
Interest Rate Swap One
Interest rate swap derivative financial instruments
Forecasted Notional Amount	160,000,000
Interest Rate Swap Two
Interest rate swap derivative financial instruments
Forecasted Notional Amount	100,000,000
Interest Rate Swap
Interest rate swap derivative financial instruments
Interest rate expense recorded on interest rate swap	8,035,000	$ 5,695,000	$ 1,066,000
Unrealized loss to be reclassified within twelve months	5,558,000
Investment securities pledged as collateral	29,585,000
Collateral pledged from counterparties to the Company	$ 0

Regulatory Capital (Details)

Regulatory Capital (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Total capital (to risk-weighted assets)
Actual, Amount	$ 1,179,673	$ 1,131,460
Actual, Ratio	16.38%	17.17%
Minimum capital requirement, Amount	$ 576,092	$ 527,160
Minimum capital requirement, Ratio	8.00%	8.00%
Tier 1 capital (to risk-weighted assets)
Actual, Amount	$ 1,089,142	$ 1,048,505
Actual, Ratio	15.12%	15.91%
Minimum capital requirement, Amount	$ 432,069	$ 395,370
Minimum capital requirement, Ratio	6.00%	6.00%
Common Equity Tier 1 (to risk-weighted assets)
Actual, Amount	$ 966,701	$ 926,523
Actual, Ratio	13.42%	14.06%
Minimum capital requirement, Amount	$ 324,052	$ 296,528
Minimum capital requirement, Ratio	4.50%	4.50%
Tier 1 capital (to average assets)
Actual, Amount	$ 1,089,142	$ 1,048,505
Actual, Ratio	11.90%	12.01%
Minimum capital requirement, Amount	$ 365,994	$ 349,066
Minimum capital requirement, Ratio	4.00%	4.00%
Glacier Bank
Total capital (to risk-weighted assets)
Actual, Amount	$ 1,131,949	$ 1,093,669
Actual, Ratio	15.76%	16.66%
Minimum capital requirement, Amount	$ 574,658	$ 525,228
Minimum capital requirement, Ratio	8.00%	8.00%
Well capitalized requirement, Amount	$ 718,323	$ 656,535
Well capitalized requirement, Ratio	10.00%	10.00%
Tier 1 capital (to risk-weighted assets)
Actual, Amount	$ 1,041,640	$ 1,010,981
Actual, Ratio	14.50%	15.40%
Minimum capital requirement, Amount	$ 430,994	$ 393,921
Minimum capital requirement, Ratio	6.00%	6.00%
Well capitalized requirement, Amount	$ 574,658	$ 525,228
Well capitalized requirement, Ratio	8.00%	8.00%
Common Equity Tier 1 (to risk-weighted assets)
Actual, Amount	$ 1,041,640	$ 1,010,981
Actual, Ratio	14.50%	15.40%
Minimum capital requirement, Amount	$ 323,245	$ 295,441
Minimum capital requirement, Ratio	4.50%	4.50%
Well capitalized requirement, Amount	$ 466,910	$ 426,748
Well capitalized requirement, Ratio	6.50%	6.50%
Tier 1 capital (to average assets)
Actual, Amount	$ 1,041,640	$ 1,010,981
Actual, Ratio	11.45%	11.66%
Minimum capital requirement, Amount	$ 363,945	$ 346,715
Minimum capital requirement, Ratio	4.00%	4.00%
Well capitalized requirement, Amount	$ 454,932	$ 433,394
Well capitalized requirement, Ratio	5.00%	5.00%

Regulatory Capital (Details Tex

Regulatory Capital (Details Textual)	Dec. 31, 2016
Common Equity Tier 1 (to risk-weighted assets)
Capital Conservation Buffer for 2016	0.625%

Stock-based Compensation Plan S

Stock-based Compensation Plan Summary of Restricted Stock Award Activity (Details) - Restricted Stock	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Restricted stock award activity for the year
Restricted Stock Non-Vested, Beginning Balance | shares	205,989
Restricted Stock, Granted | shares	134,329
Restricted Stock, Vested | shares	(115,070)
Restricted Stock, Forfeited | shares	(2,516)
Restricted Stock Non-Vested, Ending Balance | shares	222,732
Weighted-average grant date fair value
Restricted stock, weighted average grant date fair value, beginning balance | $ / shares	$ 24.24
Restricted stock, granted, weighted average grant date fair value | $ / shares	23.38
Restricted stock, vested, weighted average grant date fair value | $ / shares	22.80
Restricted stock, forfeited, weighted average grant date fair value | $ / shares	24.52
Restricted stock, weighted average grant date fair value, ending balance | $ / shares	$ 24.46

Stock-based Compensation Plan89

Stock-based Compensation Plan (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock-based Compensation Plans
Number of stock-based compensation plans	2
Shares available to grant to employees and directors	2,352,608
Restricted Stock
Restricted Stock Awards
Compensation expense related to awards	$ 2,870,000	$ 2,470,000	$ 1,603,000
Income tax benefit related to awards	1,112,000	957,000	622,000
Unrecognized compensation expense	$ 3,174,000
Unrecognized compensation expense, recognized over weighted-average period	1 year 10 months 24 days
Fair value of awards that vested	$ 2,624,000	1,761,000	953,000
Tax benefit of awards that vested	$ 1,053,000	$ 795,000	$ 532,000
Average remaining contractual term on non-vested awards	11 months
Aggregate intrinsic value of non-vested awards	$ 8,070,000

Employee Benefit Plans (Details

Employee Benefit Plans (Details Textual)	12 Months Ended
	Dec. 31, 2016USD ($)quarterhouryear	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
401(k) and Profit Sharing Plans
401(k) and Profit Sharing Plans
Minimum age required to be considered eligible for plan | year	21
Period of Employment Required to be Eligible for Plan	3 months
Minimum number of quarters required to be eligible for employer discretionary contribution | quarter	1
Minimum number of hours required to be considered eligible for employer discretionary contribution | hour	501
Percent rate for non-elective safe harbor contribution as component of profit sharing plan	3.00%
Profit Sharing Plan Expense	$ 9,041,000	$ 8,017,000	$ 7,107,000
Maximum percentage of annual compensation allowable for contribution by eligible employees	60.00%
Percentage of amount out of first specific percent of employee's contribution matched under plan	50.00%
Percentage of employee's contribution required to determine the matched amount under the plan	6.00%
Company's contribution to the plan	$ 2,946,000	2,629,000	2,246,000
Deferred Compensation Plans
401(k) and Profit Sharing Plans
Percentage of salary for deferral of cash payments	50.00%
Percentage of bonuses and directors fees for deferral of cash payments	100.00%
Total amount deferred	$ 967,000	720,000	591,000
Credit earning rate as a percentage of return on equity	50.00%
Total earnings for the plan	$ 431,000	386,000	369,000
Liability related to obligations of deferred compensation plans	11,273,000	11,971,000
Supplemental Employee Retirement Plan
401(k) and Profit Sharing Plans
Company's contribution to the plan	$ 299,000	224,000	151,000
Credit earning rate as a percentage of return on equity	50.00%
Total earnings for the plan	$ 85,000	$ 69,000	$ 59,000

Other Expenses (Details)

Other Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Expenses
Debit card expenses	$ 8,479	$ 6,153	$ 5,802
Consulting and outside services	6,080	5,525	4,179
VIE write-downs and other expenses	3,867	3,353	2,911
Loan expenses	3,611	2,824	2,513
Employee expenses	3,611	2,508	2,156
Checking and operating expenses	2,942	3,554	3,517
Printing and supplies	2,807	3,530	3,547
Postage	2,789	3,716	3,391
VIE write-downs and other expenses	2,702	4,528	4,231
Business development	1,847	1,526	1,401
Accounting and audit fees	1,674	1,401	1,393
Legal fees	1,391	1,082	1,455
ATM expenses	900	1,082	1,268
Other	4,460	3,983	3,884
Total other expenses	$ 47,160	$ 44,765	$ 41,648

Summary of Income Tax Expense (

Summary of Income Tax Expense (Details) - USD ($)		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal										$ 30,461,000	$ 28,705,000	$ 21,860,000
State										9,283,000	9,374,000	8,118,000
Total current income tax expense										39,744,000	38,079,000	29,978,000
Deferred
Federal	[1]									(70,000)	(3,451,000)	5,016,000
State	[1]									(12,000)	(629,000)	915,000
Total deferred income tax (benefit) expense	[1]									(82,000)	(4,080,000)	5,931,000
Total income tax expense		$ 9,662,000	$ 10,156,000	$ 10,492,000	$ 9,352,000	$ 8,341,000	$ 9,305,000	$ 7,488,000	$ 8,865,000	39,662,000	33,999,000	35,909,000
Tax benefit of operating loss carryforwards										$ 571,000	$ 391,000	$ 0
[1]	Includes tax benefit of operating loss carryforwards of $571,000, $391,000 and $0 for the years ended December 31, 2016, 2015, and 2014, respectively.

Summary of Effective Tax Rate (

Summary of Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective income tax rate reconciliation
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal income tax benefit	3.80%	3.70%	4.00%
Tax-exempt interest income	(12.20%)	(12.60%)	(11.50%)
Tax credits	(2.10%)	(3.00%)	(2.80%)
Other, net	0.20%	(0.50%)	(0.50%)
Effective tax rate	24.70%	22.60%	24.20%

Deferred Tax Assets and Deferre

Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets
Allowance for loan and lease losses	$ 50,172	$ 50,123
Deferred compensation	8,320	8,166
Other real estate owned	8,309	8,380
Interest rate swap agreements	5,705	7,554
Acquisition fair market value adjustments	4,763	5,842
Net operating loss carryforwards	4,737	3,590
Employee benefits	3,927	3,165
Other	5,569	5,433
Total gross deferred tax assets	91,502	92,253
Deferred tax liabilities
Deferred loan costs	(8,061)	(7,427)
Intangibles	(5,477)	(6,272)
FHLB stock dividends	(3,976)	(4,601)
Depreciation of premises and equipment	(3,111)	(2,376)
Available-for-sale securities	(1,036)	(8,812)
Other	(2,720)	(4,290)
Total gross deferred tax liabilities	(24,381)	(33,778)
Net deferred tax asset	$ 67,121	$ 58,475

Years Subject to Examination (D

Years Subject to Examination (Details)	12 Months Ended
	Dec. 31, 2016
Federal
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2013, 2014 and 2015
Montana
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2013, 2014 and 2015
Idaho
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2013, 2014 and 2015
Colorado
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2012, 2013, 2014 and 2015
Utah
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2013, 2014 and 2015

Federal and State Income Taxe96

Federal and State Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Uncertainties
Unrecognized income tax benefit	$ 0	$ 0
Accrued liabilities for the payment of interest or penalties	0	0
Valuation Allowance
Deferred tax valuation allowance	0	$ 0
Federal and State Income Taxes
Base year reserve for bad debts	3,600,000
Federal
Operating Loss and Tax Credit Carryforwards
Operating Loss Carryforwards, Amount	11,934,000
Tax Credit Carryforward, Amount	$ 411,000
Federal | Earliest Tax Year
Operating Loss and Tax Credit Carryforwards
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2030
Federal | Latest Tax Year
Operating Loss and Tax Credit Carryforwards
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2035
Colorado
Operating Loss and Tax Credit Carryforwards
Operating Loss Carryforwards, Amount	$ 14,986,000
Colorado | Earliest Tax Year
Operating Loss and Tax Credit Carryforwards
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2031
Colorado | Latest Tax Year
Operating Loss and Tax Credit Carryforwards
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2032

Accumulated Other Comprehensi97

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss)
Balance, beginning	$ 1,989	$ 17,744	$ 9,645
Other comprehensive income (loss) before reclassification	(14,119)	(18,791)	7,366
Amounts reclassified from accumulated other comprehensive income	4,748	3,036	733
Net current period other comprehensive income (loss)	(9,371)	(15,755)	8,099
Balance, end	(7,382)	1,989	17,744
Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss)
Balance, beginning	13,935	27,945	8,485
Other comprehensive income (loss) before reclassification	(13,113)	(13,968)	19,335
Amounts reclassified from accumulated other comprehensive income	817	(42)	125
Net current period other comprehensive income (loss)	(12,296)	(14,010)	19,460
Balance, end	1,639	13,935	27,945
Derivatives Used for Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Balance, beginning	(11,946)	(10,201)	1,160
Other comprehensive income (loss) before reclassification	(1,006)	(4,823)	(11,969)
Amounts reclassified from accumulated other comprehensive income	3,931	3,078	608
Net current period other comprehensive income (loss)	2,925	(1,745)	(11,361)
Balance, end	$ (9,021)	$ (11,946)	$ (10,201)

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic and Diluted Earnings Per Share
Net Income	$ 31,041	$ 30,957	$ 30,451	$ 28,682	$ 29,508	$ 29,614	$ 29,335	$ 27,670	$ 121,131	$ 116,127	$ 112,755
Average outstanding shares - basic									76,278,463	75,542,455	74,641,957
Add: dilutive restricted stock awards									63,373	53,126	45,358
Average outstanding shares - diluted									76,341,836	75,595,581	74,687,315
Basic earnings per share	$ 0.41	$ 0.40	$ 0.40	$ 0.38	$ 0.39	$ 0.39	$ 0.39	$ 0.37	$ 1.59	$ 1.54	$ 1.51
Diluted earnings per share	$ 0.41	$ 0.40	$ 0.40	$ 0.38	$ 0.39	$ 0.39	$ 0.39	$ 0.37	$ 1.59	$ 1.54	$ 1.51
Earnings Per Share
Restricted stock awards excluded from the diluted average outstanding share calculation									0	0	0

Condensed Statements of Financi

Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash on hand and in banks	$ 135,268	$ 117,137
Interest bearing cash deposits	17,273	70,036
Cash and cash equivalents	152,541	193,253
Investment securities, available-for-sale	2,425,477	2,610,760
Other assets	74,035	71,117
Total assets	9,450,600	9,089,232
Liabilities and Stockholders' Equity
Dividend payable	23,137	22,893	$ 22,557
Subordinated debentures	125,991	125,848
Other liabilities	102,038	114,062
Total liabilities	8,333,731	8,012,582
Common stock	765	761
Paid-in capital	749,107	736,368
Retained earnings	374,379	337,532
Accumulated other comprehensive (loss) income	(7,382)	1,989	17,744	$ 9,645
Total stockholders’ equity	1,116,869	1,076,650	$ 1,028,047	$ 963,250
Total liabilities and stockholders’ equity	9,450,600	9,089,232
Parent Company
Assets
Cash on hand and in banks	5,906	1,854
Interest bearing cash deposits	57,700	46,808
Cash and cash equivalents	63,606	48,662
Investment securities, available-for-sale	36	65
Other assets	10,764	11,553
Investment in subsidiaries	1,201,667	1,175,844
Total assets	1,276,073	1,236,124
Liabilities and Stockholders' Equity
Dividend payable	23,137	22,893
Subordinated debentures	125,991	125,848
Other liabilities	10,076	10,733
Total liabilities	159,204	159,474
Common stock	765	761
Paid-in capital	749,107	736,368
Retained earnings	374,379	337,532
Accumulated other comprehensive (loss) income	(7,382)	1,989
Total stockholders’ equity	1,116,869	1,076,650
Total liabilities and stockholders’ equity	$ 1,276,073	$ 1,236,124

Condensed Statements of Operati

Condensed Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Expenses
Compensation and employee benefits									$ 151,697	$ 134,409	$ 118,571
Other operating expenses									47,160	44,765	41,648
Total expenses	$ 66,717	$ 65,180	$ 64,461	$ 62,356	$ 62,203	$ 59,112	$ 59,945	$ 55,497	258,714	236,757	212,679
Income tax benefit	(9,662)	(10,156)	(10,492)	(9,352)	(8,341)	(9,305)	(7,488)	(8,865)	(39,662)	(33,999)	(35,909)
Net Income	$ 31,041	$ 30,957	$ 30,451	$ 28,682	$ 29,508	$ 29,614	$ 29,335	$ 27,670	121,131	116,127	112,755
Comprehensive Income									111,760	100,372	120,854
Parent Company
Income
Dividends from subsidiaries									108,350	109,000	78,500
Intercompany charges for services									12,248	10,562	9,283
Other income									311	196	199
Total income									120,909	119,758	87,982
Expenses
Compensation and employee benefits									15,665	13,205	10,773
Other operating expenses									7,701	7,313	6,824
Total expenses									23,366	20,518	17,597
Income before income tax benefit and equity in undistributed net income of subsidiaries									97,543	99,240	70,385
Income tax benefit									4,040	3,105	2,919
Income before equity in undistributed net income of subsidiaries									101,583	102,345	73,304
Equity in undistributed net income of subsidiaries									19,548	13,782	39,451
Net Income									121,131	116,127	112,755
Comprehensive Income									$ 111,760	$ 100,372	$ 120,854

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net income	$ 31,041	$ 30,957	$ 30,451	$ 28,682	$ 29,508	$ 29,614	$ 29,335	$ 27,670	$ 121,131	$ 116,127	$ 112,755
Adjustments to reconcile net income to net cash provided by operating activities:
Excess tax benefits from stock-based compensation									(8)	(102)	(138)
Net cash provided by operating activities									180,402	171,466	182,734
Investing Activities
Net sale (purchase) of non-marketable equity securities									6,017	27,770	801
Net cash used in by investing activities									(407,964)	(676,571)	158,893
Financing Activities
Net increase in other borrowed funds									(2,019)	(566)	(933)
Cash dividends paid									(84,040)	(79,456)	(50,944)
Excess tax benefits from stock-based compensation									8	102	138
Stock-based compensation activity									(600)	17	785
Net cash used in financing activities									186,850	255,949	(54,875)
Net increase (decrease) in cash and cash equivalents									(40,712)	(249,156)	286,752
Cash and cash equivalents at beginning of period				193,253				442,409	193,253	442,409	155,657
Cash and cash equivalents at end of period	152,541				193,253				152,541	193,253	442,409
Parent Company
Operating Activities
Net income									121,131	116,127	112,755
Adjustments to reconcile net income to net cash provided by operating activities:
Subsidiary income in excess of dividends distributed									(19,548)	(13,782)	(39,451)
Excess tax benefits from stock-based compensation									(8)	(102)	(138)
Net change in other assets and other liabilities									507	307	140
Net cash provided by operating activities									102,082	102,550	73,306
Investing Activities
Net decrease (increase) of premises and equipment									771	(1,405)	(179)
Net sale (purchase) of non-marketable equity securities									55	22	(667)
Equity contribution to subsidiaries									(3,475)	(28,457)	(18,115)
Net cash used in by investing activities									(2,649)	(29,840)	(18,961)
Financing Activities
Net increase in other borrowed funds									143	143	143
Cash dividends paid									(84,040)	(79,456)	(50,944)
Excess tax benefits from stock-based compensation									8	102	138
Stock-based compensation activity									(600)	17	785
Net cash used in financing activities									(84,489)	(79,194)	(49,878)
Net increase (decrease) in cash and cash equivalents									14,944	(6,484)	4,467
Cash and cash equivalents at beginning of period				$ 48,662				$ 55,146	48,662	55,146	50,679
Cash and cash equivalents at end of period	$ 63,606				$ 48,662				$ 63,606	$ 48,662	$ 55,146

Unaudited Quarterly Financia102

Unaudited Quarterly Financial Data (Condensed) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summarized unaudited quarterly financial data
Interest income	$ 87,759	$ 85,944	$ 86,069	$ 84,381	$ 83,211	$ 80,367	$ 78,617	$ 77,486	$ 344,153	$ 319,681	$ 299,919
Interest expense	7,214	7,318	7,424	7,675	7,215	7,309	7,369	7,382	29,631	29,275	26,966
Net interest income	80,545	78,626	78,645	76,706	75,996	73,058	71,248	70,104	314,522	290,406	272,953
Provision for loan losses	1,139	626	0	568	411	826	282	765	2,333	2,284	1,912
Net interest income after provision for loan losses	79,406	78,000	78,645	76,138	75,585	72,232	70,966	69,339	312,189	288,122	271,041
Non-interest income	28,014	28,293	26,759	24,252	24,467	25,799	25,802	22,693	107,318	98,761	90,302
Non-interest expense	66,717	65,180	64,461	62,356	62,203	59,112	59,945	55,497	258,714	236,757	212,679
Income before income taxes	40,703	41,113	40,943	38,034	37,849	38,919	36,823	36,535	160,793	150,126	148,664
Federal and state income tax expense	9,662	10,156	10,492	9,352	8,341	9,305	7,488	8,865	39,662	33,999	35,909
Net Income	$ 31,041	$ 30,957	$ 30,451	$ 28,682	$ 29,508	$ 29,614	$ 29,335	$ 27,670	$ 121,131	$ 116,127	$ 112,755
Basic earnings per share	$ 0.41	$ 0.40	$ 0.40	$ 0.38	$ 0.39	$ 0.39	$ 0.39	$ 0.37	$ 1.59	$ 1.54	$ 1.51
Diluted earnings per share	$ 0.41	$ 0.40	$ 0.40	$ 0.38	$ 0.39	$ 0.39	$ 0.39	$ 0.37	$ 1.59	$ 1.54	$ 1.51

Fair Value Measurements on a Re

Fair Value Measurements on a Recurring Basis (Details) - Recurring measurements - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial Assets
Total assets measured at fair value on a recurring basis	$ 2,425,477	$ 2,610,760
Financial Liabilities
Total liabilities measured at fair value on a recurring basis	14,725	19,499
Interest rate swaps
Financial Liabilities
Interest rate swaps	14,725	19,499
U.S. government and federal agency
Financial Assets
Investment securities, available-for-sale	39,407	47,451
U.S. government sponsored enterprises
Financial Assets
Investment securities, available-for-sale	19,570	93,167
State and local governments
Financial Assets
Investment securities, available-for-sale	786,373	885,019
Corporate bonds
Financial Assets
Investment securities, available-for-sale	471,951	384,163
Mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	1,108,176	1,200,960
Level 1
Financial Assets
Total assets measured at fair value on a recurring basis	0	0
Financial Liabilities
Total liabilities measured at fair value on a recurring basis	0	0
Level 1 | Interest rate swaps
Financial Liabilities
Interest rate swaps	0	0
Level 1 | U.S. government and federal agency
Financial Assets
Investment securities, available-for-sale	0	0
Level 1 | U.S. government sponsored enterprises
Financial Assets
Investment securities, available-for-sale	0	0
Level 1 | State and local governments
Financial Assets
Investment securities, available-for-sale	0	0
Level 1 | Corporate bonds
Financial Assets
Investment securities, available-for-sale	0	0
Level 1 | Mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	0	0
Level 2
Financial Assets
Total assets measured at fair value on a recurring basis	2,425,477	2,610,760
Financial Liabilities
Total liabilities measured at fair value on a recurring basis	14,725	19,499
Level 2 | Interest rate swaps
Financial Liabilities
Interest rate swaps	14,725	19,499
Level 2 | U.S. government and federal agency
Financial Assets
Investment securities, available-for-sale	39,407	47,451
Level 2 | U.S. government sponsored enterprises
Financial Assets
Investment securities, available-for-sale	19,570	93,167
Level 2 | State and local governments
Financial Assets
Investment securities, available-for-sale	786,373	885,019
Level 2 | Corporate bonds
Financial Assets
Investment securities, available-for-sale	471,951	384,163
Level 2 | Mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	1,108,176	1,200,960
Level 3
Financial Assets
Total assets measured at fair value on a recurring basis	0	0
Financial Liabilities
Total liabilities measured at fair value on a recurring basis	0	0
Level 3 | Interest rate swaps
Financial Liabilities
Interest rate swaps	0	0
Level 3 | U.S. government and federal agency
Financial Assets
Investment securities, available-for-sale	0	0
Level 3 | U.S. government sponsored enterprises
Financial Assets
Investment securities, available-for-sale	0	0
Level 3 | State and local governments
Financial Assets
Investment securities, available-for-sale	0	0
Level 3 | Corporate bonds
Financial Assets
Investment securities, available-for-sale	0	0
Level 3 | Mortgage-backed securities
Financial Assets
Investment securities, available-for-sale	$ 0	$ 0

Fair Value Measurements on a No

Fair Value Measurements on a Non-Recurring Basis (Details) - Nonrecurring Measurements - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned	$ 7,839	$ 7,609
Collateral-dependent impaired loans, net of ALLL	5,664	12,938
Total assets measured at fair value on a non-recurring basis	13,503	20,547
Level 1
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned	0	0
Collateral-dependent impaired loans, net of ALLL	0	0
Total assets measured at fair value on a non-recurring basis	0	0
Level 2
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned	0	0
Collateral-dependent impaired loans, net of ALLL	0	0
Total assets measured at fair value on a non-recurring basis	0	0
Level 3
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned	7,839	7,609
Collateral-dependent impaired loans, net of ALLL	5,664	12,938
Total assets measured at fair value on a non-recurring basis	$ 13,503	$ 20,547

Fair Value of Assets and Lia105

Fair Value of Assets and Liabilities Quantitative Information about Level 3 Fair Value Measurements (Details) - Nonrecurring Measurements - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		$ 13,503	$ 20,547
Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		13,503	20,547
Other real estate owned | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		7,839	7,609
Other real estate owned | Sales Comparison Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		7,767	4,067
Other real estate owned | Combined Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		$ 72	$ 3,542
Other real estate owned | Minimum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	6.00%	7.00%
Adjustment to Comparables	[1]	0.00%
Other real estate owned | Minimum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	8.00%
Adjustment to Comparables	[1]	10.00%
Other real estate owned | Maximum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	10.00%
Adjustment to Comparables	[1]	10.00%
Other real estate owned | Maximum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	8.00%
Adjustment to Comparables	[1]	10.00%
Other real estate owned | Weighted Average Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	6.90%	7.90%
Adjustment to Comparables	[1]	0.10%
Other real estate owned | Weighted Average Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	8.00%
Adjustment to Comparables	[1]	10.00%
Collateral-dependent Impaired Loans, Net of ALLL | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		$ 5,664	$ 12,938
Collateral-dependent Impaired Loans, Net of ALLL | Sales Comparison Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		1,982	9,465
Collateral-dependent Impaired Loans, Net of ALLL | Combined Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		3,572	3,311
Collateral-dependent Impaired Loans, Net of ALLL | Cost Approach | Level 3
Quantitative Information About Level 3 Fair Value Measurements
Fair Value		$ 110	$ 162
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	8.00%	8.00%
Adjustment to Comparables	[1]		0.00%
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	10.00%
Adjustment to Comparables	[1]	20.00%	20.00%
Collateral-dependent Impaired Loans, Net of ALLL | Minimum Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	6.00%	0.00%
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	20.00%
Adjustment to Comparables	[1]		5.00%
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	10.00%
Adjustment to Comparables	[1]	20.00%	20.00%
Collateral-dependent Impaired Loans, Net of ALLL | Maximum Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	20.00%	20.00%
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Sales Comparison Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	9.60%	8.90%
Adjustment to Comparables	[1]		0.00%
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Combined Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	10.00%	10.00%
Adjustment to Comparables	[1]	20.00%	20.00%
Collateral-dependent Impaired Loans, Net of ALLL | Weighted Average Range | Cost Approach | Level 3
Unobservable Inputs
Selling Costs	[1]	6.60%	6.10%
[1]	The range for selling costs and adjustments to comparables indicate reductions to the fair value.

Carrying Amount and Fair Value

Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Carrying Amount
Financial Assets
Cash and cash equivalents	$ 152,541	$ 193,253
Investment securities, available-for-sale	2,425,477	2,610,760
Investment securities, held-to-maturity	675,674	702,072
Loans held-for-sale	72,927	56,514
Loans receivable, net of ALLL	5,554,891	4,948,984
Accrued interest receivable	45,832	44,524
Non-marketable equity securities	25,550	27,495
Total financial assets	8,952,892	8,583,602
Financial Liabilities
Deposits	7,372,279	6,945,008
FHLB advances	251,749	394,131
Repurchase agreements and other borrowed funds	478,090	430,016
Subordinated debentures	125,991	125,848
Accrued interest payable	3,584	3,517
Interest rate swaps	14,725	19,499
Total financial liabilities	8,246,418	7,918,019
Estimated Fair Value | Level 1
Financial Assets
Cash and cash equivalents	152,541	193,253
Investment securities, available-for-sale	0	0
Investment securities, held-to-maturity	0	0
Loans held-for-sale	72,927	56,514
Loans receivable, net of ALLL	0	0
Accrued interest receivable	45,832	44,524
Non-marketable equity securities	0	0
Total financial assets	271,300	294,291
Financial Liabilities
Deposits	6,090,879	5,654,638
FHLB advances	0	0
Repurchase agreements and other borrowed funds	0	0
Subordinated debentures	0	0
Accrued interest payable	3,584	3,517
Interest rate swaps	0	0
Total financial liabilities	6,094,463	5,658,155
Estimated Fair Value | Level 2
Financial Assets
Cash and cash equivalents	0	0
Investment securities, available-for-sale	2,425,477	2,610,760
Investment securities, held-to-maturity	689,089	729,513
Loans held-for-sale	0	0
Loans receivable, net of ALLL	5,380,286	4,851,934
Accrued interest receivable	0	0
Non-marketable equity securities	25,550	27,495
Total financial assets	8,520,402	8,219,702
Financial Liabilities
Deposits	1,283,532	1,293,506
FHLB advances	257,643	401,530
Repurchase agreements and other borrowed funds	478,090	430,016
Subordinated debentures	85,557	81,840
Accrued interest payable	0	0
Interest rate swaps	14,725	19,499
Total financial liabilities	2,119,547	2,226,391
Estimated Fair Value | Level 3
Financial Assets
Cash and cash equivalents	0	0
Investment securities, available-for-sale	0	0
Investment securities, held-to-maturity	0	0
Loans held-for-sale	0	0
Loans receivable, net of ALLL	123,382	132,649
Accrued interest receivable	0	0
Non-marketable equity securities	0	0
Total financial assets	123,382	132,649
Financial Liabilities
Deposits	0	0
FHLB advances	0	0
Repurchase agreements and other borrowed funds	0	0
Subordinated debentures	0	0
Accrued interest payable	0	0
Interest rate swaps	0	0
Total financial liabilities	$ 0	$ 0

Contingencies and Commitment107

Contingencies and Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Outstanding Commitments
Outstanding commitments	$ 1,351,398	$ 1,263,338
Commitments to Extend Credit
Outstanding Commitments
Outstanding commitments	1,325,236	1,240,923
Letters of Credit
Outstanding Commitments
Outstanding commitments	$ 26,162	$ 22,415

Consideration Transferred, Iden

Consideration Transferred, Identifiable Net Assets Acquired and Goodwill Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Liabilities assumed
Goodwill recognized	$ 6,415	$ 10,932	$ 0
Treasure State Bank
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs	10,465
Cash consideration for outstanding shares	3,475
Contingent consideration	0
Total fair value of consideration transferred	13,940
Identifiable assets acquired
Cash and cash equivalents	10,176
Investment securities	0
Loans receivable	51,875
Core deposit intangible	762
Accrued income and other assets	6,937
Total identifiable assets acquired	69,750
Liabilities assumed
Deposits	58,364
FHLB advances and repurchase agreements	3,260
Accrued expenses and other liabilities	601
Total liabilities assumed	62,225
Total identifiable net assets	7,525
Goodwill recognized	$ 6,415
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Canon National Bank
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs		15,163
Cash consideration for outstanding shares		16,145
Contingent consideration		0
Total fair value of consideration transferred		31,308
Identifiable assets acquired
Cash and cash equivalents		17,860
Investment securities		68,486
Loans receivable		159,759
Core deposit intangible		4,532
Accrued income and other assets		9,689
Total identifiable assets acquired		260,326
Liabilities assumed
Deposits		237,326
FHLB advances and repurchase agreements		0
Accrued expenses and other liabilities		1,487
Total liabilities assumed		238,813
Total identifiable net assets		21,513
Goodwill recognized		$ 9,795
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Montana Community Banks, Inc.
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs		$ 10,776
Cash consideration for outstanding shares		12,219
Contingent consideration		0
Total fair value of consideration transferred		22,995
Identifiable assets acquired
Cash and cash equivalents		31,931
Investment securities		42,350
Loans receivable		84,689
Core deposit intangible		2,087
Accrued income and other assets		13,580
Total identifiable assets acquired		174,637
Liabilities assumed
Deposits		146,820
FHLB advances and repurchase agreements		3,292
Accrued expenses and other liabilities		2,667
Total liabilities assumed		152,779
Total identifiable net assets		21,858
Goodwill recognized		$ 1,137
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years

Pro Forma Summary (Details)

Pro Forma Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
2016 acquisitions
Pro Forma Information
Net interest income and non-interest income	$ 424,242	$ 392,252
Net income	$ 120,929	116,577
2015 acquisitions
Pro Forma Information
Net interest income and non-interest income		401,140	$ 383,387
Net income		$ 115,613	$ 115,899

Mergers and Acquisitions (Detai

Mergers and Acquisitions (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Treasure State Bank
Business Acquisition
Effective Date of Acquisition	Aug. 31, 2016
Percentage of Outstanding Common Stock Acquired	100.00%
Business Combination, Consideration Transferred	$ 13,940,000
Number of Shares Issued for Aquisition	349,545
Cash consideration for outstanding shares	$ 3,475,000
Loans receivable	51,875,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due	54,819,000
Third-party Acquisition Related Costs	456,000
Net interest income and non-interest income	1,800,000
Net income	$ 897,000
Canon National Bank
Business Acquisition
Effective Date of Acquisition		Oct. 31, 2015
Percentage of Outstanding Common Stock Acquired		100.00%
Business Combination, Consideration Transferred		$ 31,308,000
Number of Shares Issued for Aquisition		554,206
Cash consideration for outstanding shares		$ 16,145,000
Loans receivable		159,759,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due		164,568,000
Third-party Acquisition Related Costs		707,000
Net interest income and non-interest income		2,606,000
Net income		$ 563,000
Montana Community Banks, Inc.
Business Acquisition
Effective Date of Acquisition		Feb. 28, 2015
Percentage of Outstanding Common Stock Acquired		100.00%
Business Combination, Consideration Transferred		$ 22,995,000
Number of Shares Issued for Aquisition		443,644
Cash consideration for outstanding shares		$ 12,219,000
Loans receivable		84,689,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due		88,817,000
Third-party Acquisition Related Costs		1,605,000
Net interest income and non-interest income		7,492,000
Net income		$ 1,808,000