Glacier Bancorp (GBCI) 10-K 21 Feb 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 11, 2020	Jun. 30, 2019	Dec. 31, 2018
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	000-18911
Entity Registrant Name	GLACIER BANCORP, INC.
Entity Incorporation, State or Country Code	MT
Entity Tax Identification Number	81-0519541
Entity Address, Address Line One	49 Commons Loop
Entity Address, City or Town	Kalispell,
Entity Address, State or Province	MT
Entity Address, Postal Zip Code	59901
City Area Code	(406)
Local Phone Number	756-4200
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	GBCI
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 3,494,246,985
Entity Common Stock, Shares Outstanding		92,308,549
Documents Incorporated by Reference	Portions of the 2020 Annual Meeting Proxy Statement dated on or about March 16, 2020 are incorporated by reference into Parts I and III of this Form 10-K.
Common stock, par value	$ 0.01			$ 0.01
Entity Central Index Key	0000868671
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash on hand and in banks	$ 198,639	$ 161,782
Interest bearing cash deposits	132,322	42,008
Cash and cash equivalents	330,961	203,790
Debt securities, available-for-sale	2,575,252	2,571,663
Debt securities, held-to-maturity	224,611	297,915
Total debt securities	2,799,863	2,869,578
Loans held for sale, at fair value	69,194	33,156
Loans receivable	9,512,810	8,287,549
Allowance for loan and lease losses	(124,490)	(131,239)
Loans receivable, net	9,388,320	8,156,310
Premises and equipment, net	310,309	241,528
Other real estate owned	5,142	7,480
Accrued interest receivable	56,047	54,408
Deferred tax asset	2,037	23,564
Core deposit intangible, net	63,286	49,242
Goodwill	456,418	289,586
Non-marketable equity securities	11,623	27,871
Bank-owned life insurance	109,428	82,320
Other assets	81,371	76,651
Total assets	13,683,999	12,115,484
Liabilities
Non-interest bearing deposits	3,696,627	3,001,178
Interest bearing deposits	7,079,830	6,492,589
Securities sold under agreements to repurchase	569,824	396,151
Federal Home Loan Bank advances	38,611	440,175
Other borrowed funds	28,820	14,708
Subordinated debentures	139,914	134,051
Accrued interest payable	4,686	4,252
Other liabilities	164,954	116,526
Total liabilities	11,723,266	10,599,630
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	923	845
Paid-in capital	1,378,534	1,051,253
Retained earnings - substantially restricted	541,050	473,183
Accumulated other comprehensive income (loss)	40,226	(9,427)
Total stockholders’ equity	1,960,733	1,515,854
Total liabilities and stockholders’ equity	$ 13,683,999	$ 12,115,484
Number of common stock shares issued and outstanding	92,289,750	84,521,692

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
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, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Income
Investment securities	$ 85,504	$ 86,499	$ 81,968
Residential real estate loans	46,899	40,041	33,114
Commercial loans	369,107	304,164	227,356
Consumer and other loans	44,667	38,292	32,584
Total interest income	546,177	468,996	375,022
Interest Expense
Deposits	23,280	18,359	16,793
Securities sold under agreements to repurchase	3,694	2,248	1,858
Federal Home Loan Bank advances	9,023	8,880	6,748
Other borrowed funds	215	95	79
Subordinated debentures	6,561	5,949	4,386
Total interest expense	42,773	35,531	29,864
Net Interest Income	503,404	433,465	345,158
Provision for loan losses	57	9,953	10,824
Net interest income after provision for loan losses	503,347	423,512	334,334
Non-Interest Income
Service charges and other fees	67,934	74,887	67,717
Miscellaneous loan fees and charges	5,313	6,805	4,360
Gain on sale of loans	34,064	27,134	30,439
Gain (loss) on sale of debt securities	14,415	(1,113)	(660)
Other income	9,048	11,111	10,383
Total non-interest income	130,774	118,824	112,239
Non-Interest Expense
Compensation and employee benefits	222,753	195,056	160,506
Occupancy and equipment	34,497	30,734	26,631
Advertising and promotions	10,621	9,566	8,405
Data processing	17,392	15,911	14,150
Other real estate owned	1,105	3,221	1,909
Regulatory assessments and insurance	3,771	5,075	4,431
Loss on termination of hedging activities	13,528	0	0
Core deposit intangible amortization	8,485	6,270	2,494
Other expenses	62,775	54,294	47,045
Total non-interest expense	374,927	320,127	265,571
Income Before Income Taxes	259,194	222,209	181,002
Federal and state income tax expense	48,650	40,331	64,625
Net Income	$ 210,544	$ 181,878	$ 116,377
Basic earnings per share	$ 2.39	$ 2.18	$ 1.50
Diluted earnings per share	2.38	2.17	1.50
Dividends declared per share	$ 1.31	$ 1.31	$ 1.14
Average outstanding shares - basic	88,255,290	83,603,515	77,537,664
Average outstanding shares - diluted	88,385,775	83,677,185	77,607,605

Statements of Comprehensive Inc

Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 210,544	$ 181,878	$ 116,377
Other Comprehensive Income (Loss), Net of Tax
Unrealized gains (losses) on available-for-sale securities	77,158	(15,608)	3,428
Reclassification adjustment for (gains) losses included in net income	(14,423)	12	636
Net unrealized gains (losses) on available-for-sale securities	62,735	(15,596)	4,064
Tax effect	(15,896)	3,952	(1,563)
Net of tax amount	46,839	(11,644)	2,501
Unrealized (losses) gains on derivatives used for cash flow hedges	(7,047)	3,286	444
Reclassification adjustment for losses included in net income	10,816	2,334	4,892
Net unrealized gains on derivatives used for cash flow hedges	3,769	5,620	5,336
Tax effect	(955)	(1,424)	(2,083)
Net of tax amount	2,814	4,196	3,253
Total other comprehensive income (loss), net of tax	49,653	(7,448)	5,754
Total Comprehensive Income	$ 260,197	$ 174,430	$ 122,131

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 (Loss) Income
Balance, shares at Dec. 31, 2016		76,525,402
Balance at Dec. 31, 2016	$ 1,116,869	$ 765	$ 749,107	$ 374,379	$ (7,382)
Net income	116,377			116,377
Other comprehensive income (loss)	5,754			351	5,403
Cash dividends declared	(88,848)			(88,848)
Stock issued in connection with acquisitions, shares		1,381,661
Stock issued in connection with acquisitions, amount	46,673	$ 14	46,659
Stock issuances under stock incentive plans, shares		99,893
Stock issuances under stock incentive plans, value	0	$ 1	(1)
Stock-based compensation and related taxes	2,232		2,232
Balance, shares at Dec. 31, 2017		78,006,956
Balance at Dec. 31, 2017	1,199,057	$ 780	797,997	402,259	(1,979)
Net income	181,878			181,878
Other comprehensive income (loss)	(7,448)				(7,448)
Cash dividends declared	(110,954)			(110,954)
Stock issued in connection with acquisitions, shares		6,432,868
Stock issued in connection with acquisitions, amount	250,807	$ 64	250,743
Stock issuances under stock incentive plans, shares		81,868
Stock issuances under stock incentive plans, value	0	$ 1	(1)
Stock-based compensation and related taxes	$ 2,514		2,514
Balance, shares at Dec. 31, 2018	84,521,692	84,521,692
Balance at Dec. 31, 2018	$ 1,515,854	$ 845	1,051,253	473,183	(9,427)
Net income	210,544			210,544
Other comprehensive income (loss)	49,653				49,653
Cash dividends declared	(117,563)			(117,563)
Stock issued in connection with acquisitions, shares		7,519,617
Stock issued in connection with acquisitions, amount	316,538	$ 75	316,463
Stock issuances under stock incentive plans, shares		248,441
Stock issuances under stock incentive plans, value	0	$ 3	(3)
Stock-based compensation and related taxes	$ 10,821		10,821
Balance, shares at Dec. 31, 2019	92,289,750	92,289,750
Balance at Dec. 31, 2019	$ 1,960,733	$ 923	$ 1,378,534	541,050	$ 40,226
Cumulative-effect of accounting changes	$ (25,114)			$ (25,114)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash dividends declared per share	$ 1.31	$ 1.31	$ 1.14
Retained Earnings Substantially Restricted
Cash dividends declared per share	$ 1.31	$ 1.31	$ 1.14

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income		$ 210,544,000	$ 181,878,000	$ 116,377,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		57,000	9,953,000	10,824,000
Net amortization of debt securities		12,985,000	13,095,000	20,026,000
Net accretion of purchase accounting adjustments		(3,712,000)	(3,963,000)	(5,131,000)
Amortization of debt modification costs		4,630,000	1,649,000	471,000
Origination of loans held for sale		(983,988,000)	(841,451,000)	(889,212,000)
Proceeds from loans held for sale		985,345,000	896,145,000	984,506,000
Gain on sale of loans		(34,064,000)	(27,134,000)	(30,439,000)
(Gain) loss on sale of debt securities		(14,415,000)	1,113,000	660,000
Bank-owned life insurance income, net		(2,245,000)	(2,234,000)	(1,395,000)
Stock-based compensation, net of tax benefits		7,475,000	3,122,000	2,952,000
Depreciation and amortization of premises and equipment		18,592,000	16,019,000	14,758,000
Loss (gain) on sale and write-downs of other real estate owned, net		73,000	2,130,000	(1,641,000)
Deferred tax (benefit) expense	[1]	(356,000)	6,861,000	25,887,000
Core deposit intangible amortization		8,485,000	6,270,000	2,494,000
Amortization of investments in variable interest entities		9,700,000	7,639,000	4,692,000
Net decrease (increase) in accrued interest receivable		1,899,000	(2,741,000)	2,466,000
Net decrease in other assets		5,078,000	348,000	1,139,000
Net increase (decrease) in accrued interest payable		312,000	357,000	(135,000)
Net increase (decrease) in other liabilities		254,000	11,655,000	(4,558,000)
Net cash provided by operating activities		226,649,000	280,711,000	254,741,000
Investing Activities
Sales of available-for-sale debt securities		712,113,000	226,842,000	247,748,000
Maturities, prepayments and calls of available-for-sale debt securities		711,838,000	357,876,000	446,695,000
Purchases of available-for-sale debt securities		(1,224,231,000)	(820,333,000)	(36,239,000)
Maturities, prepayments and calls of held-to-maturity debt securities		58,750,000	76,832,000	25,187,000
Principal collected on loans		3,250,220,000	2,691,953,000	2,099,292,000
Loan originations		(3,623,548,000)	(3,460,227,000)	(2,740,281,000)
Net additions to premises and equipment		(16,398,000)	(18,637,000)	(10,128,000)
Proceeds from sale of other real estate owned		4,670,000	9,385,000	12,335,000
Proceeds from redemption of non-marketable equity securities		118,516,000	87,221,000	68,610,000
Purchases of non-marketable equity securities		(97,597,000)	(87,975,000)	(71,396,000)
Proceeds from bank-owned life insurance		0	1,331,000	437,000
Investments in variable interest entities		(16,348,000)	(37,956,000)	(14,514,000)
Net cash received from (paid in) acquisitions		79,333,000	101,268,000	(4,091,000)
Net cash (used in) provided by investing activities		(42,682,000)	(872,420,000)	23,655,000
Financing Activities
Net increase in deposits		285,856,000	599,037,000	(89,397,000)
Net increase in securities sold under agreements to repurchase		172,264,000	4,398,000	(111,077,000)
Net (decrease) increase in short-term Federal Home Loan Bank advances		(255,000,000)	85,000,000	137,200,000
Proceeds from long-term Federal Home Loan Bank advances		0	0	150,000,000
Repayments of long-term Federal Home Loan Bank advances		(151,160,000)	(1,198,000)	(208,192,000)
Net increase (decrease) in other borrowed funds		14,109,000	(5,059,000)	3,784,000
Cash dividends paid		(124,468,000)	(85,493,000)	(111,720,000)
Tax withholding payments for stock-based compensation		(1,293,000)	(1,214,000)	(1,531,000)
Proceeds from stock option exercises		2,896,000	24,000	0
Net cash (used in) provided by financing activities		(56,796,000)	595,495,000	(230,933,000)
Net increase in cash, cash equivalents and restricted cash		127,171,000	3,786,000	47,463,000
Cash, cash equivalents and restricted cash at beginning of period		203,790,000	200,004,000	152,541,000
Cash, cash equivalents and restricted cash at end of period		330,961,000	203,790,000	200,004,000
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest		42,461,000	35,174,000	30,000,000
Cash paid during the period for income taxes		36,817,000	26,489,000	40,219,000
Supplemental Disclosure of Non-Cash Investing Activities
Transfer of debt securities from held-to-maturity to available-for-sale		0	270,331,000	0
Sale and refinancing of other real estate owned		7,000	406,000	553,000
Transfer of loans to other real estate owned		2,349,000	4,924,000	4,466,000
Right-of-use assets obtained in exchange for operating lease liabilities		9,948,000	0	0
Dividends declared during the period but not paid		18,686,000	25,726,000	265,000
Fair value of common stock shares issued		316,538,000	250,807,000	46,673,000
Cash consideration		16,424,000	16,265,000	17,342,000
Effective settlement of pre-existing receivable		0	10,054,000	0
Fair value of assets acquired		1,190,267,000	1,660,882,000	355,230,000
Liabilities assumed		$ 1,024,137,000	$ 1,383,756,000	$ 321,824,000
[1]	Includes tax benefit of operating loss carryforwards of $317,000, $443,000 and $644,000 for the years ended December 31, 2019, 2018, and 2017, respectively.

Nature of Operations and Summar

Nature of Operations and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
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, Utah, Washington, Wyoming, Colorado, Arizona and Nevada through its wholly-owned bank subsidiary, Glacier Bank (“Bank”). The Company offers a wide range of banking products and services, including: 1) retail banking; 2) business banking; 3) real estate, commercial, agriculture and consumer loans; and 4) 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 debt 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 sixteen bank divisions, a treasury division, an information technology division and a centralized mortgage division. The treasury division includes the Bank’s investment portfolio and wholesale borrowings, the information technology division includes the Bank’s internal data processing, and the centralized mortgage division includes mortgage loan servicing and secondary market sales. 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 (“CEO”) (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 Bank also has subsidiary interests in VIEs for which the Bank does not have a controlling financial interest and is not the primary beneficiary. These subsidiary interests are not included in the Company’s consolidated financial statements. The parent holding company 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 other assets on the Company's statements of financial condition. In July 2019, the Company completed the acquisition of Heritage Bancorp, the bank holding company for Heritage Bank of Nevada, a community bank based in Reno, Nevada (collectively, “Heritage”). In April 2019, the Company completed the acquisition of FNB Bancorp, the holding company for The First National Bank of Layton, a community bank based in Layton, Utah (collectively, “FNB”). In February 2018, the Company completed its acquisition of Inter-Mountain Bancorp., Inc. and its wholly-owned subsidiary, First Security Bank, a community bank based in Bozeman, Montana (collectively, “FSB”). In January 2018, the Company completed its acquisition of Columbine Capital Corp., and its wholly-owned subsidiary, Collegiate Peaks Bank, a community bank based in Buena Vista, Colorado (collectively, “Collegiate”). In April 2017, the Company completed its acquisition of TFB Bancorp, Inc. and its wholly-owned subsidiary, The Foothills Bank, a community bank based in Yuma, Arizona. The business combinations were accounted for using the acquisition method, with the results of operations included in the Company’s consolidated financial statements as of the acquisition dates. For additional information relating to recent mergers and acquisitions, see Note 22. Pending Acquisition On September 30, 2019, the Company announced the signing of a definitive agreement to acquire State Bank Corp., the parent company of State Bank of Arizona, a community bank based in Lake Havasu City, Arizona (collectively, “SBAZ” ). SBAZ provides banking services to individuals and businesses in Arizona with locations in Bullhead City, Cottonwood, Kingman, Lake Havasu City, Phoenix, Prescott Valley and Prescott. As of December 31, 2019, SBAZ had total assets of $677,654,000, gross loans of $439,237,000 and total deposits of $586,688,000. The acquisition has received regulatory approvals, is subject to other customary conditions of closing and is expected to be completed in the first quarter of 2020. Upon closing of the transaction, SBAZ will merge into the Company's Foothills Bank division and will expand the Company's footprint in Arizona to cover all major markets in the state and be a leading community bank in Arizona. 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, 2019 was $50,055,000. Debt 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 securities held primarily for the purpose of selling in the near term are classified as trading securities and are reported at fair value, with unrealized gains and losses included in income. Debt 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 (“OCI”). Premiums and discounts on debt 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 debt 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 debt 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 debt 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 debt 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 debt securities, see Note 2. Temporary versus Other-Than-Temporary Impairment The Company assesses individual debt securities in its investment portfolio for impairment at least on a quarterly basis, and more frequently when economic or market conditions warrant. A debt security 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 debt 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. 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 OCI, net of tax. For held-to-maturity debt securities, the amount of an other-than-temporary impairment recorded in OCI 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 intended to be sold on the secondary market. Loans held for sale are recorded at fair value as of each balance sheet date. The fair value includes the servicing value of the loans and any change in fair value is recognized in non-interest income. Fair value elections are made at the time of origination or purchase based on the Company’s fair value election policy. 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 non-accrual, 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. 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 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. 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 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 non-accrual 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 and overdraft 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 other real estate owned (“OREO”) until such time as it is sold. 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 to 40 years and the estimated useful life for furniture, fixtures, and equipment is 3 to 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. A lessee lease is classified as an operating lease unless it meets certain criteria (e.g., lease contains option to purchase that Company is reasonably certain to exercise), in which case it is classified as a finance lease. Effective January 1, 2019, operating leases are included in net premises and equipment and other liabilities on the Company’s statements of financial condition and lease expense for lease payments is recognized on a straight-line basis over the lease term. Finance leases are included in net premises and equipment and other borrowed funds on the Company’s statements of financial condition. Right-of-use (“ROU”) assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. An ROU asset represents the right to use the underlying asset for the lease term and also includes any direct costs and payments made prior to lease commencement and excludes lease incentives. When an implicit rate is not available, an incremental borrowing rate based on the information available at commencement date is used in determining the present value of the lease payments. A lease term may include an option to extend or terminate the lease when it is reasonably certain the option will be exercised. The Company accounts for lease and nonlease components (e.g., common-area maintenance) together as a single combined lease component for all asset classes. Short-term leases of 12 months or less are excluded from accounting guidance; as a result, the lease payments are recognized on a straight-line basis over the lease term and the leases are not reflected on the Company’s statements of financial condition. Renewal and termination options are considered when determining short-term leases. Leases are accounted for on an individual lease level. 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. The Company also leases certain premises and equipment to third parties. A lessor lease is classified as an operating lease unless it meets certain criteria that would classify it as either a sales-type lease or a direct financing 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 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, 2019 and 2018, 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

Debt Securities

Debt Securities	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Debt Securities	Debt Securities The following tables present the amortized cost, the gross unrealized gains and losses and the fair value of the Company’s debt securities: December 31, 2019 Amortized Gross Unrealized Fair (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 20,061 48 (65) 20,044 U.S. government sponsored enterprises 42,724 953 — 43,677 State and local governments 679,784 22,694 (80) 702,398 Corporate bonds 155,665 1,938 (1) 157,602 Residential mortgage-backed securities 731,766 7,507 (549) 738,724 Commercial mortgage-backed securities 891,374 22,825 (1,392) 912,807 Total available-for-sale 2,521,374 55,965 (2,087) 2,575,252 Held-to-maturity State and local governments 224,611 9,785 — 234,396 Total held-to-maturity 224,611 9,785 — 234,396 Total debt securities $ 2,745,985 65,750 (2,087) 2,809,648 December 31, 2018 Amortized Gross Unrealized Fair (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 23,757 54 (162) 23,649 U.S. government sponsored enterprises 120,670 52 (514) 120,208 State and local governments 844,636 18,936 (11,322) 852,250 Corporate bonds 292,052 378 (1,613) 290,817 Residential mortgage-backed securities 808,537 628 (16,250) 792,915 Commercial mortgage-backed securities 490,868 3,312 (2,356) 491,824 Total available-for-sale 2,580,520 23,360 (32,217) 2,571,663 Held-to-maturity State and local governments 297,915 1,380 (11,039) 288,256 Total held-to-maturity 297,915 1,380 (11,039) 288,256 Total debt securities $ 2,878,435 24,740 (43,256) 2,859,919 In November 2018, the Company adopted FASB ASU 2017-12, Derivatives and Hedging , and in doing so redesignated state and local government securities with a carrying value of $270,331,000, from held-to-maturity classification to available-for-sale classification. The Company considers the available-for-sale classification of these debt securities to be appropriate since it no longer had the intent to hold them to maturity. No gain or loss was recorded at the time of transfer. The following table presents the amortized cost and fair value of available-for-sale and held-to-maturity debt securities by contractual maturity at December 31, 2019. Actual maturities may differ from expected or contractual maturities since issuers have the right to prepay obligations with or without prepayment penalties. December 31, 2019 Available-for-Sale Held-to-Maturity (Dollars in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 62,317 62,555 — — Due after one year through five years 170,631 174,195 12,841 13,383 Due after five years through ten years 206,056 214,517 71,708 75,771 Due after ten years 459,230 472,454 140,062 145,242 898,234 923,721 224,611 234,396 Mortgage-backed securities 1 1,623,140 1,651,531 — — Total $ 2,521,374 2,575,252 224,611 234,396 ______________________________ 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 debt 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 debt securities $ 928,710 265,587 280,783 Gross realized gains 1 18,936 443 3,369 Gross realized losses 1 (4,513) (455) (4,005) Held-to-maturity Proceeds from calls of debt securities 58,750 79,000 23,020 Gross realized gains 1 2 101 204 Gross realized losses 1 (10) (1,202) (228) ______________________________ 1 The gain or loss on the sale or call of each debt security is determined by the specific identification method. At December 31, 2019 and 2018, the Company had debt securities with carrying values of $1,475,752,000 and $1,333,455,000, 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. Debt securities with an unrealized loss position are summarized as follows: December 31, 2019 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Available-for-sale U.S. government and federal agency $ 464 — 9,902 (65) 10,366 (65) State and local governments 19,044 (80) — — 19,044 (80) Corporate bonds 7,378 (1) — — 7,378 (1) Residential mortgage-backed securities 85,562 (234) 29,038 (315) 114,600 (549) Commercial mortgage-backed securities 177,051 (1,293) 7,697 (99) 184,748 (1,392) Total available-for-sale $ 289,499 (1,608) 46,637 (479) 336,136 (2,087) December 31, 2018 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Available-for-sale U.S. government and federal agency $ 4,287 (27) 10,519 (135) 14,806 (162) U.S. government sponsored enterprises 43,400 (103) 35,544 (411) 78,944 (514) State and local governments 72,080 (922) 232,244 (10,400) 304,324 (11,322) Corporate bonds 119,111 (937) 114,800 (676) 233,911 (1,613) Residential mortgage-backed securities 132,405 (833) 537,202 (15,417) 669,607 (16,250) Commercial mortgage-backed securities 73,118 (402) 86,504 (1,954) 159,622 (2,356) Total available-for-sale $ 444,401 (3,224) 1,016,813 (28,993) 1,461,214 (32,217) Held-to-maturity State and local governments $ 87,392 (2,778) 126,226 (8,261) 213,618 (11,039) Total held-to-maturity $ 87,392 (2,778) 126,226 (8,261) 213,618 (11,039)

Loans Receivable, Net

Loans Receivable, Net	12 Months Ended
	Dec. 31, 2019
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: (Dollars in thousands) December 31, December 31, Residential real estate loans $ 926,388 887,742 Commercial loans Real estate 5,579,307 4,657,561 Other commercial 2,094,254 1,911,171 Total 7,673,561 6,568,732 Consumer and other loans Home equity 617,201 544,688 Other consumer 295,660 286,387 Total 912,861 831,075 Loans receivable 9,512,810 8,287,549 Allowance for loan and lease losses (124,490) (131,239) Loans receivable, net $ 9,388,320 8,156,310 Net deferred origination (fees) costs included in loans receivable $ (6,964) (5,685) Net purchase accounting (discounts) premiums included in loans receivable $ (21,574) (25,172) At December 31, 2019, the Company had loans of $5,228,136,000 pledged as collateral for FHLB advances and FRB discount window. 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, 2019 and 2018. No borrower had outstanding loans or commitments exceeding 10 percent of the Company’s consolidated stockholders’ equity as of December 31, 2019. Loans that are serviced for others are not reported as assets. The principal balances of these loans were $185,897,000 and $181,281,000 at December 31, 2019 and 2018, respectively. The fair value of servicing rights was insignificant at December 31, 2019 and 2018. There were no significant purchases or sales of portfolio loans during 2019, 2018 and 2017. 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, 2019 and 2018 was $57,825,000 and $59,528,000, respectively. During 2019, new loans to such related parties were $17,504,000 and repayments were $19,207,000. 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. Allowance for Loan and Lease Losses The ALLL is a valuation allowance for probable incurred credit losses. The following tables summarize the activity in the ALLL by loan class: Year ended December 31, 2019 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 131,239 10,631 72,448 38,160 5,811 4,189 Provision for loan losses 57 (163) (2,704) (23) (863) 3,810 Charge-offs (15,178) (608) (2,460) (4,189) (90) (7,831) Recoveries 8,372 251 2,212 2,181 79 3,649 Balance at end of period $ 124,490 10,111 69,496 36,129 4,937 3,817 Year ended December 31, 2018 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 129,568 10,798 68,515 39,303 6,204 4,748 Provision for loan losses 9,953 474 4,343 1,916 (471) 3,691 Charge-offs (17,807) (728) (3,469) (5,045) (210) (8,355) Recoveries 9,525 87 3,059 1,986 288 4,105 Balance at end of period $ 131,239 10,631 72,448 38,160 5,811 4,189 Year ended December 31, 2017 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 129,572 12,436 65,773 37,823 7,572 5,968 Provision for loan losses 10,824 (1,521) 7,152 2,545 (1,103) 3,751 Charge-offs (19,331) (199) (6,188) (2,856) (489) (9,599) Recoveries 8,503 82 1,778 1,791 224 4,628 Balance at end of period $ 129,568 10,798 68,515 39,303 6,204 4,748 The following tables disclose the recorded investment in loans and the balance in the ALLL by loan class: December 31, 2019 (Dollars in thousands) Total Residential Commercial Other Home Other Loans receivable Individually evaluated for impairment $ 94,504 7,804 58,609 21,475 3,745 2,871 Collectively evaluated for impairment 9,418,306 918,584 5,520,698 2,072,779 613,456 292,789 Total loans receivable $ 9,512,810 926,388 5,579,307 2,094,254 617,201 295,660 ALLL Individually evaluated for impairment $ 95 — 73 10 — 12 Collectively evaluated for impairment 124,395 10,111 69,423 36,119 4,937 3,805 Total ALLL $ 124,490 10,111 69,496 36,129 4,937 3,817 December 31, 2018 (Dollars in thousands) Total Residential Commercial Other Home Other Loans receivable Individually evaluated for impairment $ 108,788 12,685 68,837 20,975 3,497 2,794 Collectively evaluated for impairment 8,178,761 875,057 4,588,724 1,890,196 541,191 283,593 Total loans receivable $ 8,287,549 887,742 4,657,561 1,911,171 544,688 286,387 ALLL Individually evaluated for impairment $ 3,223 83 568 2,313 39 220 Collectively evaluated for impairment 128,016 10,548 71,880 35,847 5,772 3,969 Total ALLL $ 131,239 10,631 72,448 38,160 5,811 4,189 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. Aging Analysis The following tables present an aging analysis of the recorded investment in loans by loan class: December 31, 2019 (Dollars in thousands) Total Residential Commercial Other Home Other Accruing loans 30-59 days past due $ 15,944 3,403 4,946 4,685 1,040 1,870 Accruing loans 60-89 days past due 7,248 749 2,317 1,190 1,902 1,090 Accruing loans 90 days or more past due 1,412 753 64 143 — 452 Non-accrual loans 30,883 4,715 15,650 6,592 3,266 660 Total past due and non-accrual loans 55,487 9,620 22,977 12,610 6,208 4,072 Current loans receivable 9,457,323 916,768 5,556,330 2,081,644 610,993 291,588 Total loans receivable $ 9,512,810 926,388 5,579,307 2,094,254 617,201 295,660 December 31, 2018 (Dollars in thousands) Total Residential Commercial Other Home Other Accruing loans 30-59 days past due $ 24,312 5,251 9,477 4,282 3,213 2,089 Accruing loans 60-89 days past due 9,255 860 3,231 3,838 735 591 Accruing loans 90 days or more past due 2,018 788 — 492 428 310 Non-accrual loans 47,252 8,021 27,264 8,619 2,575 773 Total past due and non-accrual loans 82,837 14,920 39,972 17,231 6,951 3,763 Current loans receivable 8,204,712 872,822 4,617,589 1,893,940 537,737 282,624 Total loans receivable $ 8,287,549 887,742 4,657,561 1,911,171 544,688 286,387 Impaired Loans 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. The following tables disclose information related to impaired loans by loan class: At or for the Year ended December 31, 2019 (Dollars in thousands) Total Residential Commercial Other Home Other Loans with a specific valuation allowance Recorded balance $ 5,388 — 5,343 10 — 35 Unpaid principal balance 5,388 — 5,343 10 — 35 Specific valuation allowance 95 — 73 10 — 12 Average balance 10,378 409 6,341 3,490 24 114 Loans without a specific valuation allowance Recorded balance 89,116 7,804 53,266 21,465 3,745 2,836 Unpaid principal balance 99,355 9,220 57,735 24,758 4,494 3,148 Average balance 93,338 9,879 59,107 18,079 3,486 2,787 Total Recorded balance 94,504 7,804 58,609 21,475 3,745 2,871 Unpaid principal balance 104,743 9,220 63,078 24,768 4,494 3,183 Specific valuation allowance 95 — 73 10 — 12 Average balance 103,716 10,288 65,448 21,569 3,510 2,901 At or for the Year ended December 31, 2018 (Dollars in thousands) Total Residential Commercial Other Home Other Loans with a specific valuation allowance Recorded balance $ 19,197 1,957 9,345 7,268 120 507 Unpaid principal balance 19,491 2,220 9,345 7,268 120 538 Specific valuation allowance 3,223 83 568 2,313 39 220 Average balance 19,519 2,686 8,498 7,081 82 1,172 Loans without a specific valuation allowance Recorded balance 89,591 10,728 59,492 13,707 3,377 2,287 Unpaid principal balance 107,486 11,989 71,300 17,689 3,986 2,522 Average balance 106,747 10,269 73,889 17,376 3,465 1,748 Total Recorded balance 108,788 12,685 68,837 20,975 3,497 2,794 Unpaid principal balance 126,977 14,209 80,645 24,957 4,106 3,060 Specific valuation allowance 3,223 83 568 2,313 39 220 Average balance 126,266 12,955 82,387 24,457 3,547 2,920 Interest income recognized on impaired loans for the years ended December 31, 2019, 2018, and 2017 was not significant. Restructured Loans A restructured loan is considered a troubled debt restructuring 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 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, 2019 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 18 1 6 6 2 3 Pre-modification recorded balance $ 18,508 117 8,524 9,382 214 271 Post-modification recorded balance $ 18,476 123 8,524 9,364 214 251 TDRs that subsequently defaulted Number of loans 1 — 1 — — — Recorded balance $ 106 — 106 — — — Year ended December 31, 2018 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 25 4 8 10 2 1 Pre-modification recorded balance $ 21,995 724 12,901 7,813 252 305 Post-modification recorded balance $ 21,881 724 12,787 7,813 252 305 TDRs that subsequently defaulted Number of loans 1 1 — — — — Recorded balance $ 47 47 — — — — Year ended December 31, 2017 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 32 5 13 11 2 1 Pre-modification recorded balance $ 41,521 841 31,109 9,403 158 10 Post-modification recorded balance $ 38,838 841 28,426 9,403 158 10 TDRs that subsequently defaulted Number of loans 1 — — 1 — — Recorded balance $ 18 — — 18 — — The modifications for the loans designated as TDRs during the years ended December 31, 2019, 2018 and 2017 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.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2019
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, 2019 December 31, 2018 Land $ 52,738 47,511 Buildings and construction in progress 251,151 231,854 Furniture, fixtures and equipment 96,576 90,030 Leasehold improvements 11,144 9,370 Accumulated depreciation (148,373) (137,237) Net premises and equipment, excluding ROU assets 263,236 241,528 ROU assets 47,073 — Net premises and equipment $ 310,309 241,528 Leases The Company leases certain land, premises and equipment from third parties. Effective January 1, 2019, ROU assets for operating and finance leases are included in net premises and equipment and lease liabilities are included in other liabilities and other borrowed funds, respectively, on the Company’s statements of financial condition. The following table summarizes the Company’s leases: December 31, 2019 (Dollars in thousands) Finance Operating ROU assets $ 6,537 Accumulated depreciation (917) Net ROU assets $ 5,620 41,453 Lease liabilities $ 5,671 43,904 Weighted-average remaining lease term 24 years 19 years Weighted-average discount rate 3.0 % 3.7 % Maturities of lease liabilities consist of the following: December 31, 2019 (Dollars in thousands) Finance Operating Maturing within one year $ 335 3,965 Maturing one year through two years 257 3,761 Maturing two years through three years 255 3,473 Maturing three years through four years 261 3,123 Maturing four years through five years 268 3,130 Thereafter 6,797 45,336 Total lease payments 8,173 62,788 Present value of lease payments Short-term 170 2,421 Long-term 5,501 41,483 Total present value of lease payments 5,671 43,904 Difference between lease payments and present value of lease payments $ 2,502 18,884 The components of lease expense consist of the following: Year ended (Dollars in thousands) December 31, Finance lease cost Amortization of ROU assets $ 101 Interest on lease liabilities 34 Operating lease cost 4,063 Short-term lease cost 431 Variable lease cost 896 Sublease income (6) Total lease expense $ 5,519 Supplemental cash flow information related to leases is as follows: Year ended December 31, 2019 (Dollars in thousands) Finance Operating Cash paid for amounts included in the measurement of lease liabilities Operating cash flows $ 34 2,136 Financing cash flows 98 N/A ______________________________ N/A - Not applicable

Other Intangible Assets and Goo

Other Intangible Assets and Goodwill	12 Months Ended
	Dec. 31, 2019
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 $ 85,506 62,977 21,649 Accumulated amortization (22,220) (13,735) (7,465) Net carrying value $ 63,286 49,242 14,184 Aggregate amortization expense $ 8,485 6,270 2,494 Estimated amortization expense for the years ending December 31, 2020 $ 9,978 2021 9,519 2022 9,029 2023 8,276 2024 7,535 Core deposit intangibles increased $22,529,000, $41,328,000 and $4,331,000 during 2019, 2018 and 2017, respectively, due to acquisitions. For additional information relating to acquisitions, see Note 22. The following schedule 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 $ 289,586 177,811 147,053 Acquisitions and adjustments 166,832 111,775 30,758 Net carrying value at end of period $ 456,418 289,586 177,811 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 2019 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 2019 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, 2019. 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. Accumulated impairment charges were $40,159,000 as of December 31, 2019 and 2018.

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2019
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. 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 seven years 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. The Bank is also the sole member of certain tax credit funds that make direct investments in qualified affordable housing projects (e.g., Low-Income Housing Tax Credit [“LIHTC”] partnerships). As such, the Company is the primary beneficiary of these tax credit funds and their assets, liabilities, and results of operations are included in the Company’s consolidated financial statements. 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 $ 84,390 80,123 Accrued interest receivable 63 96 Other assets 54,692 45,779 Total assets $ 139,145 125,998 Liabilities Other borrowed funds $ 23,149 14,527 Accrued interest payable 36 1 Other liabilities 123 125 Total liabilities $ 23,308 14,653 Unconsolidated Variable Interest Entities The Company has equity investments in LIHTC partnerships, both directly and through tax credit funds, with carrying values of $41,521,000 and $35,112,000 as of December 31, 2019 and 2018, respectively. 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 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 years. 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. There were no impairment losses on the Company’s LIHTC investments during the years ended December 31, 2019, 2018 and 2017. Future unfunded contingent commitments related to the Company’s LIHTC investments at December 31, 2019 are as follows: (Dollars in thousands) Amount Years ending December 31, 2020 $ 11,916 2021 7,692 2022 7,471 2023 130 2024 309 Thereafter 419 Total $ 27,937 The Company has elected to use the proportional amortization method, and more specifically, the practical expedient method, for the amortization of all eligible LIHTC investments and amortization expense is recognized as a component of income tax expense. 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. Years ended (Dollars in thousands) December 31, 2019 December 31, 2018 December 31, Amortization expense $ 6,289 4,926 2,507 Tax credits and other tax benefits recognized 8,547 6,550 3,827 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, First Company Statutory Trust 2003, FNB (UT) Statutory Trust I and FNB (UT) Statutory Trust II. 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, 2019
Deposits [Abstract]
Deposits	Deposits Time deposits that meet or exceed the Federal Deposit Insurance Corporation Insurance (“FDIC”) limit of $250,000 at December 31, 2019 and 2018 were $281,054,000 and $244,999,000, respectively. The scheduled maturities of time deposits are as follows: (Dollars in thousands) Amount Years ending December 31, 2020 $ 706,520 2021 150,925 2022 55,809 2023 23,584 2024 21,513 Thereafter 150 $ 958,501

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Borrowings	Borrowings The Company’s repurchase agreements totaled $569,824,000 and $396,151,000 at December 31, 2019 and 2018, respectively, and are secured by debt securities with carrying values of $711,210,000 and $511,294,000, 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, 2019 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total Residential mortgage-backed securities $ 312,015 — 312,015 Commercial mortgage-backed securities 257,809 — 257,809 Total $ 569,824 — 569,824 December 31, 2018 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total Residential mortgage-backed securities $ 328,174 — 328,174 Commercial mortgage-backed securities 66,339 1,638 67,977 Total $ 394,513 1,638 396,151 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 debt securities, FHLB stock owned by the Company, and a blanket assignment of the unpledged qualifying loans and investments. In September 2019, the Company implemented a balance sheet strategy to increase its net interest income and net interest margin. The strategy included early termination of the Company's pay-fixed interest rate swaps and corresponding debt, including FHLB advances. A $3,531,000 loss was recognized on the early payment of the FHLB advances and was reported in loss on termination of hedging activities on the Company’s statements of operations. The scheduled maturities of FHLB advances consist of the following: December 31, 2019 December 31, 2018 (Dollars in thousands) Amount Weighted Amount Weighted Maturing within one year $ 31,492 1.81 % $ 285,847 2.63 % Maturing one year through two years 5,000 2.95 % 1,572 3.50 % Maturing two years through three years 889 5.25 % 150,370 3.77 % Maturing three years through four years 165 5.45 % 918 5.25 % Maturing four years through five years 780 4.31 % 204 5.45 % Thereafter 285 6.31 % 1,264 4.82 % Total $ 38,611 2.14 % $ 440,175 3.03 % The Company’s other borrowings consisted of finance lease liabilities and other debt obligations through consolidation of certain VIEs. At December 31, 2019, the Company had $230,000,000 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, 2019
Debt Instruments [Abstract]
Subordinated Debentures	Subordinated Debentures The Company’s subordinated debentures are reflected in the table below. The amounts include fair value adjustments from acquisitions. December 31, 2019 Rate Structure Maturity (Dollars in thousands) Balance Rate Subordinated debentures owed to trust subsidiaries First Company Statutory Trust 2001 $ 3,395 5.227 % 3 month LIBOR plus 3.30% 07/31/2031 First Company Statutory Trust 2003 2,497 5.197 % 3 month LIBOR plus 3.25% 03/26/2033 Glacier Capital Trust II 46,393 4.736 % 3 month LIBOR plus 2.75% 04/07/2034 Citizens (ID) Statutory Trust I 5,155 4.550 % 3 month LIBOR plus 2.65% 06/17/2034 Glacier Capital Trust III 36,083 3.276 % 3 month LIBOR plus 1.29% 04/07/2036 Glacier Capital Trust IV 30,928 3.464 % 3 month LIBOR plus 1.57% 09/15/2036 Bank of the San Juans Bancorporation Trust I 1,970 3.734 % 3 month LIBOR plus 1.82% 03/01/2037 FNB (UT) Statutory Trust I 4,124 5.061 % 3 month LIBOR plus 3.10% 06/26/2033 FNB (UT) Statutory Trust II 1,752 3.614 % 3 month LIBOR plus 1.72% 12/15/2036 Total subordinated debentures owed to trust subsidiaries 132,297 Tier 2 subordinated debentures 7,617 6.625 % Fixed 10/01/2025 Total subordinated debentures $ 139,914 Subordinated Debentures Owed to Trust Subsidiaries 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 the $15 billion threshold as a result of organic growth. Once the Company has crossed the $15 billion threshold, any subsequent merger or acquisition would result in disqualification of the Company’s combined trust preferred securities as Tier 1 capital ; however, the trust preferred securities would be included in Tier 2 capital. If the Company crosses the $15 billion threshold as a direct result of an acquisition, neither the Company’s nor the acquired institution’s trust preferred securities would continue to qualify as Tier 1 capital, but instead would be included in Tier 2 capital. All of the Company’s trust preferred securities qualified as Tier 1 capital instruments at December 31, 2019. Tier 2 Subordinated Debentures The Company acquired subordinated debentures with the FSB acquisition that qualify as Tier 2 capital under the applicable capital adequacy rules and regulations promulgated by the FRB. The Tier 2 subordinated debentures are not deposits and are not insured by the FDIC or any other government agency. Such obligations are subordinated to the claims of general creditors, are unsecured and are ineligible as collateral. The principal amount is due at maturity and interest distributions are payable quarterly. The Tier 2 subordinated debentures shall not be prepaid prior to the fifth anniversary of the closing date, which is September 30, 2020, except in the event the obligation no longer qualifies as Tier 2 capital (“Tier 2 capital event”) or the interest payable is no longer deductible (“tax event”). Any prepayment made in connection with a Tier 2 capital event or a tax event will be subject to obtaining the prior approval of the FRB. The Company has the ability to prepay these obligations on or after the fifth anniversary of the closing date at any time with notice.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities Interest Rate Swap Derivatives 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 forecasted variable rate borrowings. In September 2019, the Company implemented a balance sheet strategy to increase its net interest income and net interest margin. The strategy included early termination of the Company’s pay-fixed interest rate swaps with notional amounts totaling $260,000,000. A $9,997,000 loss was recognized on the early termination of the pay-fixed interest rate swaps and was reported in loss on termination of hedging activities on the Company’s statements of operations. The Company recognized 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 allowed 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 was exposed to credit-related losses in the event of nonperformance by the counterparty to the agreements. The Company controlled the counterparty credit risk by maintaining bilateral collateral agreements and through monitoring policy and procedures. The Company only conducted business with primary dealers and believed that the credit risk inherent in these contracts was not significant. The interest rate swaps that were terminated had $160,000,000 and $100,000,000 of notional amounts and began their payment terms in October 2014 and November 2015, respectively. The Company designated wholesale deposits and FHLB advances for the cash flow hedge and these hedged items were determined to be fully effective during current and prior periods. The aggregate fair value of the interest rate swaps was recorded in other liabilities with changes recorded in OCI. Interest expense recorded on the interest rate swaps totaled $5,532,000, $8,013,000 and $8,013,000 during 2019, 2018 and 2017, respectively, and was reported as a component of interest expense on deposits and FHLB advances. The following table presents the pre-tax gains or losses recorded in OCI 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 (loss) gain recognized in OCI $ (7,047) 3,286 444 Amount of loss reclassified from OCI to interest expense (10,816) (2,334) (4,892) The following table discloses the offsetting of financial assets and interest rate swap derivative assets. December 31, 2019 December 31, 2018 (Dollars in thousands) Gross Amount of Recognized Assets Gross Amount Offset in the Statements of Financial Position Net Amounts of Assets Presented in the Statements of Financial Position Gross Amount of Recognized Assets Gross Amount Offset in the Statements of Financial Position Net Amounts of Assets Presented in the Statements of Financial Position Interest rate swaps $ — — — 139 (139) — The following table discloses the offsetting of financial liabilities and interest rate swap derivative liabilities. December 31, 2019 December 31, 2018 (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 $ — — — 3,908 (139) 3,769 Residential Real Estate Derivatives

Regulatory Capital

Regulatory Capital	12 Months Ended
	Dec. 31, 2019
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 certain regulatory amendments based on the recommendation of the Basel Committee on Banking Supervision and certain requirements of the Dodd-Frank Act and substantially amended the regulatory risk-based capital rules applicable to the Company. The Final Rules require the Company to hold a 2.5 percent capital conservation buffer designed to absorb losses during periods of economic stress. The Company has elected to opt-out of the requirement to include most components of accumulated other comprehensive income. As of December 31, 2019, 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. At December 31, 2019 and 2018, 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, 2019 that management believes have changed the Company’s or Bank’s risk-based capital category. 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. In certain circumstances, Montana law also places limits or restrictions on a bank’s ability to declare and pay dividends. The following tables illustrate the FRB’s adequacy guidelines and the Company’s and the Bank’s compliance with those guidelines: December 31, 2019 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 $ 1,661,249 14.95 % $ 888,986 8.00 % N/A N/A Glacier Bank 1,625,527 14.64 % 888,110 8.00 % $ 1,110,137 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated 1,528,683 13.76 % 666,740 6.00 % N/A N/A Glacier Bank 1,500,461 13.52 % 666,082 6.00 % 888,110 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated 1,398,183 12.58 % 500,055 4.50 % N/A N/A Glacier Bank 1,500,461 13.52 % 499,562 4.50 % 721,589 6.50 % Tier 1 capital (to average assets) Consolidated 1,528,683 11.65 % 524,987 4.00 % N/A N/A Glacier Bank 1,500,461 11.50 % 522,040 4.00 % 652,550 5.00 % December 31, 2018 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 $ 1,437,889 14.70 % $ 782,453 8.00 % N/A N/A Glacier Bank 1,401,991 14.35 % 781,430 8.00 % $ 976,787 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated 1,308,017 13.37 % 586,840 6.00 % N/A N/A Glacier Bank 1,279,778 13.10 % 586,072 6.00 % 781,430 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated 1,183,517 12.10 % 440,130 4.50 % N/A N/A Glacier Bank 1,279,778 13.10 % 439,554 4.50 % 634,911 6.50 % Tier 1 capital (to average assets) Consolidated 1,308,017 11.35 % 461,130 4.00 % N/A N/A Glacier Bank 1,279,778 11.08 % 462,072 4.00 % 577,590 5.00 % ______________________________ N/A - Not applicable

Stock-based Compensation Plan

Stock-based Compensation Plan	12 Months Ended
	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation Plan	Stock-based Compensation Plan The Company’s stock-based compensation plan, 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, 2019, the number of shares available to award to employees and directors under the 2015 Stock Incentive Plan was 2,041,367. During 2019 and 2018, the Company also assumed stock-based compensation plans through the Heritage and Collegiate acquisitions, respectively. No additional shares may be awarded from these plans. Restricted Stock Units The Company has awarded restricted stock units to select employees and directors under the 2015 Stock Incentive Plan. Common stock is issued as vesting restrictions lapse, which may be immediately or according to the terms of a vesting schedule. Restricted stock units may not be sold, pledged or otherwise transferred until restrictions have lapsed. The recipient does not have the right to vote or to receive dividends until the restricted stock unit has vested. The fair value of the restricted stock unit is the closing price of the Company’s common stock on the award date. Compensation expense related to restricted stock units for the years ended December 31, 2019, 2018 and 2017 was $3,803,000, $3,684,000 and $3,764,000, respectively, and the recognized income tax benefit related to this expense was $964,000, $934,000 and $1,452,000. As of December 31, 2019, total unrecognized compensation expense of $4,434,000 related to restricted stock units is expected to be recognized over a weighted-average period of 2.0 years. The fair value of restricted stock units that vested during the years ended December 31, 2019, 2018 and 2017 was $3,536,000, $3,319,000 and $3,746,000, respectively, and the income tax benefit related to these awards was $1,124,000, $1,126,000 and $1,998,000, respectively. Upon vesting of restricted stock units, the shares are issued from the Company’s authorized stock balance. The following table summarizes the restricted stock unit activity for the year ended December 31, 2019: Restricted Weighted- Non-vested at December 31, 2018 181,983 $ 36.03 Granted 101,978 42.96 Vested (103,473) 34.17 Forfeited (3,827) 40.80 Non-vested at December 31, 2019 176,661 41.01 The average remaining contractual term on non-vested restricted stock units at December 31, 2019 is 0.9 years. The aggregate intrinsic value of the non-vested restricted stock units at December 31, 2019 was $8,125,000. Stock Options During 2019 and 2018, the Company assumed stock options through the Heritage and Collegiate acquisitions, respectively. All stock option shares and per share market values were adjusted at acquisition dates. The option price at which the Company's common stock may be purchased upon exercise of stock options granted under the plans must be at least equal to the per share market value of such stock at the date the option was granted. Upon exercise of the stock options, the shares are obtained from the Company's authorized and unissued stock. Prior to the Heritage and Collegiate stock options being assumed, there were no outstanding stock options and there were no stock options granted during 2019, 2018 or 2017. Compensation expense related to stock options for the years ended December 31, 2019 and 2018 was $5,415,000 and $19,000, respectively, and the recognized income tax benefit related to this expense was $1,372,000 and $5,000. As of December 31, 2019, total unrecognized compensation expense of $23,000 related to stock options is expected to be recognized over a weighted-average period of 1.4 years. The total intrinsic value of options exercised during the years ended December 31, 2019 and 2018 was $4,491,000 and $13,000, respectively, and the income tax benefit related to these exercises was $934,000 and $0. Total cash received from options exercised during the years ended December 31, 2019 and 2018 was $2,896,000 and $24,000, respectively. Changes in shares granted for stock options for the year ended December 31, 2019 are summarized as follows: Stock Weighted- Outstanding at December 31, 2018 26,167 $ 25.84 Acquisitions 235,246 16.70 Exercised (175,161) 16.53 Forfeited (2,787) 25.84 Outstanding at December 31, 2019 83,465 19.61 Exercisable at December 31, 2019 72,315 18.65 The average remaining contractual term on outstanding stock options at December 31, 2019 is 5.7 years. The aggregate intrinsic value of the outstanding stock options at December 31, 2019 was $2,202,000.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [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, short- and 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 non-insured 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 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, 2019, 2018, and 2017 was $17,227,000, $15,406,000 and $10,100,000 respectively. The 401(k) plan allows eligible employees under the age of 50 to contribute up to 60 percent, and those 50 and older to contribute up to 100 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, 2019, 2018 and 2017 was $4,236,000, $4,037,000, and $3,224,000, 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. As of December 31, 2019 and 2018, the liability related to the plans was $8,660,000 and $8,371,000, respectively, and was included in other liabilities. The total amount deferred for the plans was $766,000, $803,000, and $739,000, for the years ending December 31, 2019, 2018, and 2017, respectively. The participant receives an earnings credit at a rate equal to 50 percent of the Company’s return on average equity. Total expense incurred for the years ended December 31, 2019, 2018, and 2017 for the plans was $480,000, $502,000 and $481,000, respectively. In connection with several acquisitions, the Company assumed the obligations of deferred compensation plans for certain key employees. As of December 31, 2019 and 2018, the liability related to the acquired plans was $17,661,000 and $13,651,000, respectively, and was included in other liabilities. Total expense incurred for the years ended December 31, 2019, 2018, and 2017 for the acquired plans was $992,000, $801,000 and $588,000, respectively. 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. As of December 31, 2019 and 2018, the liability related to the SERP was $2,713,000 and $2,287,000, respectively, and was included in other liabilities. The Company’s required contribution to the SERP for the years ended December 31, 2019, 2018 and 2017 was $662,000, $423,000, and $287,000, respectively. The participant receives an earnings credit at a rate equal to 50 percent of the Company’s return on average equity. Total expense incurred for the years ended December 31, 2019, 2018, and 2017 for the SERP was $120,000, $122,000, and $105,000, respectively.

Other Expenses

Other Expenses	12 Months Ended
	Dec. 31, 2019
Other Expenses [Abstract]
Other Expenses	Other Expenses Other expenses consists of the following: Years ended (Dollars in thousands) December 31, December 31, December 31, Mergers and acquisition expenses $ 8,503 6,618 2,130 Consulting and outside services 8,276 7,219 5,331 Debit card expenses 5,968 5,104 7,189 Employee expenses 5,138 4,412 4,160 Telephone 4,827 4,487 3,891 Business development 4,446 4,172 3,333 VIE amortization and other expenses 4,341 3,618 3,109 Loan expenses 4,140 3,462 3,080 Postage 3,437 3,104 2,684 Printing and supplies 3,256 3,264 2,661 Checking and operating expenses 1,757 1,234 1,760 Accounting and audit fees 1,712 1,456 1,848 ATM expenses 1,700 1,217 1,720 Legal fees 1,245 1,763 1,106 Other 4,029 3,164 3,043 Total other expenses $ 62,775 54,294 47,045

Federal and State Income Taxes

Federal and State Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal and State Income Taxes	Federal and State Income Taxes The Tax Cuts and Jobs Act (“Tax Act”) was enacted on December 22, 2017 and resulted in a decrease in the federal marginal corporate income tax rate from 35 percent to 21 percent beginning in 2018. As a result of the Tax Act, the Company incurred a one-time tax expense adjustment of $19,699,000 during 2017 due to the Company’s revaluation of the deferred tax assets and deferred tax liabilities (“net deferred tax asset”). This adjustment is reflected in the following tables. The following table is a summary of consolidated income tax expense: Years ended (Dollars in thousands) December 31, December 31, December 31, Current Federal $ 34,461 21,510 29,555 State 14,545 11,960 9,183 Total current income tax expense 49,006 33,470 38,738 Deferred 1 Federal (279) 5,372 22,246 State (77) 1,489 3,641 Total deferred income tax (benefit) expense (356) 6,861 25,887 Total income tax expense $ 48,650 40,331 64,625 ______________________________ 1 Includes tax benefit of operating loss carryforwards of $317,000, $443,000 and $644,000 for the years ended December 31, 2019, 2018, and 2017, respectively. Combined federal and state income tax expense differs from that computed at the federal statutory corporate income tax rate as follows: Years ended December 31, December 31, December 31, Federal statutory rate 21.0 % 21.0 % 35.0 % State taxes, net of federal income tax benefit 4.4 % 4.8 % 4.6 % Tax rate change — % — % 10.9 % Tax-exempt interest income (3.7 %) (5.0 %) (10.5 %) Tax credits (4.5 %) (4.2 %) (3.2 %) Other, net 1.6 % 1.6 % (1.1 %) Effective income tax rate 18.8 % 18.2 % 35.7 % 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 $ 31,698 33,313 Operating lease liabilities 11,127 — Deferred compensation 7,447 6,251 Employee benefits 6,646 5,652 Acquisition fair market value adjustments 5,480 6,380 Net operating loss carryforwards 2,209 2,525 Available-for-sale debt securities — 2,244 Other 3,891 3,841 Total gross deferred tax assets 68,498 60,206 Deferred tax liabilities Intangibles (16,469) (12,667) Depreciation of premises and equipment (13,987) (10,776) Available-for-sale debt securities (13,652) — Operating lease ROU assets (10,506) — Deferred loan costs (7,311) (6,436) FHLB stock dividends (1,486) (2,722) Other (3,050) (4,041) Total gross deferred tax liabilities (66,461) (36,642) Net deferred tax asset $ 2,037 23,564 The Company has federal net operating loss carryforwards of $8,038,000 expiring between 2030 and 2035. The Company has Colorado net operating loss carryforwards of $11,989,000 expiring between 2031 and 2032. The net operating loss carryforwards originated from acquisitions. The Company and the Bank file consolidated income tax returns in the following jurisdictions: federal, Montana, Idaho, Utah, Colorado and Arizona. Wyoming, Washington and Nevada do not impose a corporate 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, 2019: Years ended December 31, Federal 2005, 2008, 2010, 2011, 2012, 2013, 2016, 2017 and 2018 Montana 2016, 2017 and 2018 Idaho 2016, 2017 and 2018 Utah 2016, 2017 and 2018 Colorado 2010, 2011, 2012, 2015, 2016, 2017 and 2018 Arizona 2015, 2016, 2017 and 2018 The Company had no unrecognized income tax benefits as of December 31, 2019 and 2018. 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, 2019, 2018, and 2017 was not significant. The Company had no accrued liabilities for the payment of interest or penalties at December 31, 2019 and 2018. The Company has assessed the need for a valuation allowance and determined that a valuation allowance was not necessary at December 31, 2019 and 2018. 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 expected future net operating losses (for tax purposes).

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Income (Loss) The following table illustrates the activity within accumulated other comprehensive income (loss) by component, net of tax: (Dollars in thousands) Gains (Losses) on Available-For-Sale Debt Securities Losses on Derivatives Used for Cash Flow Hedges Total Balance at January 1, 2017 $ 1,639 (9,021) (7,382) Other comprehensive income before reclassifications 2,110 248 2,358 Reclassification adjustments for losses included in net income 391 3,005 3,396 Reclassifications to retained earnings 1 891 (1,242) (351) Net current period other comprehensive income 3,392 2,011 5,403 Balance at December 31, 2017 $ 5,031 (7,010) (1,979) Other comprehensive (loss) income before reclassifications (11,653) 2,453 (9,200) Reclassification adjustments for losses included in net income 9 1,743 1,752 Net current period other comprehensive (loss) income (11,644) 4,196 (7,448) Balance at December 31, 2018 $ (6,613) (2,814) (9,427) Other comprehensive income (loss) before reclassifications 57,607 (5,261) 52,346 Reclassification adjustments for (gains) losses included in net income (10,768) 8,075 (2,693) Net current period other comprehensive income 46,839 2,814 49,653 Balance at December 31, 2019 $ 40,226 — 40,226 ______________________________ 1 Reclassifications were due to the one-time revaluation of the net deferred tax asset as a result of the Tax Act. For additional information on the Tax Act, see Note 15.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Note 17. 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 units were vested and stock options were exercised, 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 $ 210,544 181,878 116,377 Average outstanding shares - basic 88,255,290 83,603,515 77,537,664 Add: dilutive restricted stock units and stock options 130,485 73,670 69,941 Average outstanding shares - diluted 88,385,775 83,677,185 77,607,605 Basic earnings per share $ 2.39 2.18 1.50 Diluted earnings per share $ 2.38 2.17 1.50 Restricted stock units and stock options excluded from the diluted average outstanding share calculation 1 — 1,357 — ______________________________ 1 Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock units or the exercise price of a stock option exceeds the market price of the Company’s stock.

Parent Holding Company Informat

Parent Holding Company Information (Condensed)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information 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 $ 23,491 22,000 Interest bearing cash deposits 34,345 42,299 Cash and cash equivalents 57,836 64,299 Other assets 12,966 12,639 Investment in subsidiaries 2,063,011 1,612,115 Total assets $ 2,133,813 1,689,053 Liabilities and Stockholders’ Equity Dividends payable $ 18,821 25,726 Subordinated debentures 139,914 134,051 Other liabilities 14,345 13,422 Total liabilities 173,080 173,199 Common stock 923 845 Paid-in capital 1,378,534 1,051,253 Retained earnings 541,050 473,183 Accumulated other comprehensive income (loss) 40,226 (9,427) Total stockholders’ equity 1,960,733 1,515,854 Total liabilities and stockholders’ equity $ 2,133,813 1,689,053 Condensed Statements of Operations and Comprehensive Income Years ended (Dollars in thousands) December 31, December 31, December 31, Income Dividends from subsidiaries $ 142,000 153,574 119,000 Intercompany charges for services 20,661 16,523 14,299 Other income 513 1,284 228 Total income 163,174 171,381 133,527 Expenses Compensation and employee benefits 25,806 20,873 17,864 Other operating expenses 15,118 12,201 10,425 Total expenses 40,924 33,074 28,289 Income before income tax benefit and equity in undistributed net income of subsidiaries 122,250 138,307 105,238 Income tax benefit 4,488 3,773 2,983 Income before equity in undistributed net income of subsidiaries 126,738 142,080 108,221 Equity in undistributed net income of subsidiaries 83,806 39,798 8,156 Net Income $ 210,544 181,878 116,377 Comprehensive Income $ 260,197 174,430 122,131 Condensed Statements of Cash Flows Years ended (Dollars in thousands) December 31, December 31, December 31, Operating Activities Net income $ 210,544 181,878 116,377 Adjustments to reconcile net income to net cash provided by operating activities: Subsidiary income in excess of dividends distributed (83,806) (39,798) (8,156) Stock-based compensation, net of tax benefits 1,320 1,219 1,460 Net change in other assets and other liabilities 1,854 (3,209) 5,191 Net cash provided by operating activities 129,912 140,090 114,872 Investing Activities Sales of available-for-sale debt securities — — 27 Net additions of premises and equipment (114) (300) (79) Proceeds from sale of marketable equity securities 89 — 114 Equity contributions to subsidiaries (13,485) (24,989) (17,565) Net cash used in investing activities (13,510) (25,289) (17,503) Financing Activities Net decrease in other borrowed funds — (11,543) — Cash dividends paid (124,468) (85,493) (111,720) Tax withholding payments for stock-based compensation (1,293) (1,214) (1,531) Proceeds from stock option exercises 2,896 24 — Net cash used in financing activities (122,865) (98,226) (113,251) Net (decrease) increase in cash, cash equivalents and restricted cash (6,463) 16,575 (15,882) Cash, cash equivalents and restricted cash at beginning of period 64,299 47,724 63,606 Cash, cash equivalents and restricted cash at end of period $ 57,836 64,299 47,724

Unaudited Quarterly Financial D

Unaudited Quarterly Financial Data (Condensed)	12 Months Ended
	Dec. 31, 2019
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 2019 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 126,116 132,385 142,395 145,281 Interest expense 10,904 12,089 10,947 8,833 Net interest income 115,212 120,296 131,448 136,448 Provision for loan losses 57 — — — Net interest income after provision for loan losses 115,155 120,296 131,448 136,448 Non-interest income 28,474 30,834 43,049 28,417 Non-interest expense 82,830 86,170 110,675 95,252 Income before income taxes 60,799 64,960 63,822 69,613 Federal and state income tax expense 11,667 12,568 12,212 12,203 Net income $ 49,132 52,392 51,610 57,410 Basic earnings per share $ 0.58 0.61 0.57 0.62 Diluted earnings per share $ 0.58 0.61 0.57 0.62 Quarters ended 2018 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 103,066 117,715 122,905 125,310 Interest expense 7,774 9,161 9,160 9,436 Net interest income 95,292 108,554 113,745 115,874 Provision for loan losses 795 4,718 3,194 1,246 Net interest income after provision for loan losses 94,497 103,836 110,551 114,628 Non-interest income 26,086 31,828 32,416 28,494 Non-interest expense 73,627 81,795 82,829 81,876 Income before income taxes 46,956 53,869 60,138 61,246 Federal and state income tax expense 8,397 9,485 10,802 11,647 Net income $ 38,559 44,384 49,336 49,599 Basic earnings per share $ 0.48 0.53 0.58 0.59 Diluted earnings per share $ 0.48 0.52 0.58 0.59

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	12 Months Ended
	Dec. 31, 2019
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, 2019, 2018, and 2017. 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, 2019. Debt securities, available-for-sale: fair value for available-for-sale debt 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 debt 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 debt 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. Loans held for sale, at fair value: loans held for sale measured at fair value, for which an active secondary market and readily available market prices exist, are initially valued at the transaction price and are subsequently valued by using quoted prices for similar assets, adjusted for specific attributes of that loan or other observable market data, such as outstanding commitments from third party investors. Loans held for sale measured at fair value are classified within Level 2. Included in gain on sale of loans were net gains of $661,000, net losses of $155,000 and net gains of $994,000 for the years ended December 31, 2019, 2018 and 2017, respectively, from the changes in fair value of loans held for sale measured at fair value. Electing to measure loans held for sale at fair value reduces certain timing differences and better matches changes in fair value of these assets with changes in the value of the derivative instruments used to economically hedge them without the burden of complying with the requirements for hedge accounting. Interest rate swap derivative financial instruments: fair values for interest rate swap derivative financial instruments were based upon the estimated amounts to settle the contracts considering current interest rates and were calculated using discounted cash flows that were observable or that could be corroborated by observable market data and, therefore, were classified within Level 2 of the valuation hierarchy. The inputs used to determine fair value included 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 were compared to the fixed rate outflows and such difference was discounted to a present value to estimate the fair value of the interest rate swaps. The Company also obtained and compared the reasonableness of the pricing from an independent third party. The following tables disclose the fair value measurement of assets and liabilities measured at fair value on a recurring basis: Fair Value Measurements (Dollars in thousands) Fair Value December 31, 2019 Quoted Prices Significant Significant Debt securities, available-for-sale U.S. government and federal agency $ 20,044 — 20,044 — U.S. government sponsored enterprises 43,677 — 43,677 — State and local governments 702,398 — 702,398 — Corporate bonds 157,602 — 157,602 — Residential mortgage-backed securities 738,724 — 738,724 — Commercial mortgage-backed securities 912,807 — 912,807 — Loans held for sale, at fair value 69,194 — 69,194 — Total assets measured at fair value on a recurring basis $ 2,644,446 — 2,644,446 — Fair Value Measurements (Dollars in thousands) Fair Value December 31, 2018 Quoted Prices Significant Significant Debt securities, available-for-sale U.S. government and federal agency $ 23,649 — 23,649 — U.S. government sponsored enterprises 120,208 — 120,208 — State and local governments 852,250 — 852,250 — Corporate bonds 290,817 — 290,817 — Residential mortgage-backed securities 792,915 — 792,915 — Commercial mortgage-backed securities 491,824 — 491,824 — Loans held for sale, at fair value 33,156 — 33,156 — Total assets measured at fair value on a recurring basis $ 2,604,819 — 2,604,819 — Interest rate swaps $ 3,769 — 3,769 — Total liabilities measured at fair value on a recurring basis $ 3,769 — 3,769 — 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, 2019. Other real estate owned: OREO is initially recorded at fair value less estimated cost to sell, establishing a new cost basis. OREO is subsequently accounted for at lower of cost or 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. 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 department reviews 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 (Dollars in thousands) Fair Value December 31, 2019 Quoted Prices Significant Significant Other real estate owned $ 1,983 — — 1,983 Collateral-dependent impaired loans, net of ALLL 23 — — 23 Total assets measured at fair value on a non-recurring basis $ 2,006 — — 2,006 Fair Value Measurements (Dollars in thousands) Fair Value December 31, 2018 Quoted Prices Significant Significant Other real estate owned $ 1,011 — — 1,011 Collateral-dependent impaired loans, net of ALLL 6,985 — — 6,985 Total assets measured at fair value on a non-recurring basis $ 7,996 — — 7,996 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 $ 1,983 Sales comparison approach Selling costs 6.0% - 10.0% (7.3%) Adjustment to comparables 0.0% - 11.1% (4.5%) Collateral-dependent $ 9 Cost approach Selling costs 10.0% - 10.0% (10.0%) 14 Sales comparison approach Adjustment to comparables 0.0% - 0.0% (0.0%) $ 23 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 $ 1,011 Sales comparison approach Selling costs 8.0% - 15.0% (9.2%) Collateral-dependent impaired loans, net of ALLL $ 2,384 Sales comparison approach Selling costs 8.0% - 20.0% (9.9%) 4,601 Combined approach Selling costs 10.0% - 10.0% (10.0%) $ 6,985 ______________________________ 1 The range for selling cost inputs represents reductions to the fair value of the assets. Fair Value 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 not carried at fair value. Receivables and payables due in one year or less, equity securities without readily determinable fair values and deposits with no defined or contractual maturities are excluded. Fair Value Measurements (Dollars in thousands) Carrying Amount December 31, 2019 Quoted Prices Significant Significant Financial assets Cash and cash equivalents $ 330,961 330,961 — — Debt securities, held-to-maturity 224,611 — 234,396 — Loans receivable, net of ALLL 9,388,320 — — 9,438,121 Total financial assets $ 9,943,892 330,961 234,396 9,438,121 Financial liabilities Term deposits $ 1,011,798 — 1,017,505 — FHLB advances 38,611 — 38,787 — Repurchase agreements and other borrowed funds 598,644 — 598,644 — Subordinated debentures 139,914 — 124,094 — Total financial liabilities $ 1,788,967 — 1,779,030 — Fair Value Measurements (Dollars in thousands) Carrying Amount December 31, 2018 Quoted Prices Significant Significant Financial assets Cash and cash equivalents $ 203,790 203,790 — — Debt securities, held-to-maturity 297,915 — 288,256 — Loans receivable, net of ALLL 8,156,310 — — 8,079,112 Total financial assets $ 8,658,015 203,790 288,256 8,079,112 Financial liabilities Term deposits $ 1,070,208 — 1,069,777 — FHLB advances 440,175 — 439,615 — Repurchase agreements and other borrowed funds 410,859 — 410,859 — Subordinated debentures 134,051 — 120,302 — Total financial liabilities $ 2,055,293 — 2,040,553 —

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Commitments and Contingent Liabilities 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, Unused lines of credit $ 2,422,828 1,948,516 Letters of credit 59,845 45,263 Total outstanding commitments $ 2,482,673 1,993,779 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, 2019
Business Combinations [Abstract]
Mergers and Acquisitions	Mergers and Acquisitions The Company has completed the following acquisitions during the last two years: • Heritage Bancorp and its wholly-owned subsidiary, Heritage Bank of Nevada • FNB Bancorp and its wholly-owned subsidiary, The First National Bank of Layton • Inter-Mountain Bancorp., Inc. and its wholly-owned subsidiary, First Security Bank • Columbine Capital Corp., and its wholly-owned subsidiary, Collegiate Peaks Bank The assets and liabilities of Heritage, FNB, FSB and Collegiate were recorded on the Company’s consolidated statements of financial condition at their estimated fair values as of their acquisition dates and their results of operations have been included in the Company’s consolidated statements of operations since those dates. The following table discloses the fair value estimates of the consideration transferred, the total identifiable net assets acquired and the resulting goodwill arising from the acquisitions: (Dollars in thousands) Heritage FNB FSB February 28, 2018 Collegiate January 31, 2018 Fair value of consideration transferred Fair value of Company shares issued $ 229,385 87,153 181,043 69,764 Cash consideration 16,420 4 — 16,265 Effective settlement of a pre-existing relationship — — — 10,054 Total fair value of consideration transferred 245,805 87,157 181,043 96,083 Recognized amounts of identifiable assets acquired and liabilities assumed Identifiable assets acquired Cash and cash equivalents 84,446 11,311 24,397 93,136 Debt securities 103,231 47,247 271,865 42,177 Loans receivable 615,279 245,485 627,767 354,252 Core deposit intangible 1 13,566 8,963 31,053 10,275 Accrued income and other assets 35,891 24,848 78,274 15,911 Total identifiable assets acquired 852,413 337,854 1,033,356 515,751 Liabilities assumed Deposits 722,220 274,646 877,586 437,171 Borrowings 2 — 7,273 36,880 12,509 Accrued expenses and other liabilities 9,919 10,079 14,175 5,435 Total liabilities assumed 732,139 291,998 928,641 455,115 Total identifiable net assets 120,274 45,856 104,715 60,636 Goodwill recognized $ 125,531 41,301 76,328 35,447 ______________________________ 1 The core deposit intangible for each acquisition was determined to have an estimated life of 10 years . 2 Borrowings assumed with the FSB acquisition included Tier 2 subordinated debentures of $5,864,000 . 2019 Acquisitions On July 31, 2019, the Company acquired 100 percent of the outstanding common stock of Heritage Bancorp and its wholly-owned subsidiary, Heritage Bank of Nevada, a community bank based in Reno, Nevada. Heritage provides banking services to individuals and businesses throughout northern Nevada with locations in Carson City, Gardnerville, Reno and Sparks. The acquisition expands the Company’s franchise footprint into Northern Nevada. Heritage operates as a new division of the Bank under its existing name and management team. The Heritage acquisition was valued at $245,805,000 and resulted in the Company issuing 5,473,276 shares of its common stock and paying $16,420,000 in cash in exchange for all of Heritage’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 July 31, 2019 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 Heritage. None of the goodwill is deductible for income tax purposes as the acquisition was accounted for as a tax-free exchange. On April 30, 2019, the Company acquired 100 percent of the outstanding common stock of FNB Bancorp and its wholly-owned subsidiary, The First National Bank of Layton, a community bank based in Layton, Utah. FNB provides banking services to individuals and businesses throughout Utah with locations in Layton, Bountiful, Clearfield and Draper. The acquisition expands the Company’s presence in Utah and sets the stage for future growth. The branches of FNB, along with the Bank’s branches operating in Utah, operate as a new division of the Bank under the name “First Community Bank Utah, division of Glacier Bank.” The FNB acquisition was valued at $87,157,000 and resulted in the Company issuing 2,046,341 shares of its common stock. 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 April 30, 2019 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 FNB. None of the goodwill is deductible for income tax purposes as the acquisition was accounted for as a tax-free exchange. The fair values of the Heritage and FNB assets acquired include loans with fair values of $615,279,000 and $245,485,000, respectively. The gross principal and contractual interest due under the Heritage and FNB contracts was $617,214,000 and $248,226,000, 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 $3,032,000 and $4,979,000 of expenses in connection with the Heritage and FNB acquisitions, respectively, during the year ended December 31, 2019. Mergers and acquisition expenses are included in other expense in the Company's consolidated statements of operations and consist of third-party costs, conversion costs and employee retention and severance expenses. Total income consisting of net interest income and non-interest income of the acquired operations of Heritage was approximately $15,506,000 and net income was approximately $2,286,000 from July 31, 2019 to December 31, 2019. Total income consisting of net interest income and non-interest income of the acquired operations of FNB was approximately $12,607,000 and net income was approximately $249,000 from April 30, 2019 to December 31, 2019. The following unaudited pro forma summary presents consolidated information of the Company as if the Heritage and FNB acquisitions had occurred on January 1, 2018: Year ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income 662,937 608,787 Net income 216,045 209,004 2018 Acquisitions On February 28, 2018, the Company acquired 100 percent of the outstanding common stock of Inter-Mountain Bancorp., Inc. and its wholly-owned subsidiary, First Security Bank, a community bank based in Bozeman, Montana. FSB provides banking services to individuals and businesses throughout Montana with locations in Bozeman, Belgrade, Big Sky, Choteau, Fairfield, Fort Benton, Three Forks, Vaughn and West Yellowstone. The acquisition expands the Company’s presence in the Bozeman and Golden Triangle markets in Montana and further diversifies the Company’s loan, customer and deposit base. FSB merged into the Bank and became a new bank division headquartered in Bozeman and the Bank’s existing Bozeman-based division, Big Sky Western Bank, combined with the new FSB division. The agriculture-focused northern branches of FSB combined with the Bank’s First Bank of Montana division. The FSB acquisition was valued at $181,043,000 and resulted in the Company issuing 4,654,091 shares of its common stock. 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, 2018 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 FSB. None of the goodwill is deductible for income tax purposes as the acquisition was accounted for as a tax-free exchange. On January 31, 2018, the Company acquired 100 percent of the outstanding common stock of Columbine Capital Corp. and its wholly-owned subsidiary, Collegiate Peaks Bank, a community bank based in Buena Vista, Colorado. Collegiate provides banking services to businesses and individuals in the Mountain and Front Range communities of Colorado, with locations in Aurora, Buena Vista, Denver and Salida. The acquisition expands the Company’s presence in Colorado to the mountains and along the Front Range and further diversifies the Company’s loan, customer and deposit base. Collegiate merged into the Bank and operates as a separate Bank division under its existing name and management team. The Collegiate acquisition was valued at $96,083,000 and resulted in the Company issuing 1,778,777 shares of its common stock and paying $16,265,000 in cash in exchange for all of Collegiate’s outstanding common stock shares and $10,054,000 due to an effective settlement of pre-existing receivable from Columbine Capital Corp. 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 January 31, 2018 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 Collegiate. None of the goodwill is deductible for income tax purposes as the acquisition was accounted for as a tax-free exchange. The fair values of the FSB and Collegiate assets acquired include loans with fair values of $627,767,000 and $354,252,000, respectively. The gross principal and contractual interest due under the FSB and Collegiate contracts was $632,370,000 and $355,364,000, 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 $4,714,000 and $1,683,000 of expenses in connection with the FSB and Collegiate acquisitions, respectively, during the year ended December 31, 2018. Mergers and acquisition expenses are included in other expense in the Company's consolidated statements of operations and consist of third-party costs, conversion costs and employee retention and severance expenses. Total income consisting of net interest income and non-interest income of the acquired operations of FSB was approximately $42,796,000 and net income was approximately $11,303,000 from February 28, 2018 to December 31, 2018. Total income consisting of net interest income and non-interest income of the acquired operations of Collegiate was approximately $23,921,000 and net income was approximately $4,962,000 from January 31, 2018 to December 31, 2018. The following unaudited pro forma summary presents consolidated information of the Company as if the FSB and Collegiate acquisitions had occurred on January 1, 2017: Years ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income $ 560,979 520,634 Net income 177,267 138,042

Nature of Operations and Summ_2

Nature of Operations and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
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, Utah, Washington, Wyoming, Colorado, Arizona and Nevada through its wholly-owned bank subsidiary, Glacier Bank (“Bank”). The Company offers a wide range of banking products and services, including: 1) retail banking; 2) business banking; 3) real estate, commercial, agriculture and consumer loans; and 4) 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 debt 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 sixteen bank divisions, a treasury division, an information technology division and a centralized mortgage division. The treasury division includes the Bank’s investment portfolio and wholesale borrowings, the information technology division includes the Bank’s internal data processing, and the centralized mortgage division includes mortgage loan servicing and secondary market sales. 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 (“CEO”) (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 Bank also has subsidiary interests in VIEs for which the Bank does not have a controlling financial interest and is not the primary beneficiary. These subsidiary interests are not included in the Company’s consolidated financial statements. The parent holding company 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 other assets on the Company's statements of financial condition. In July 2019, the Company completed the acquisition of Heritage Bancorp, the bank holding company for Heritage Bank of Nevada, a community bank based in Reno, Nevada (collectively, “Heritage”). In April 2019, the Company completed the acquisition of FNB Bancorp, the holding company for The First National Bank of Layton, a community bank based in Layton, Utah (collectively, “FNB”). In February 2018, the Company completed its acquisition of Inter-Mountain Bancorp., Inc. and its wholly-owned subsidiary, First Security Bank, a community bank based in Bozeman, Montana (collectively, “FSB”). In January 2018, the Company completed its acquisition of Columbine Capital Corp., and its wholly-owned subsidiary, Collegiate Peaks Bank, a community bank based in Buena Vista, Colorado (collectively, “Collegiate”). In April 2017, the Company completed its acquisition of TFB Bancorp, Inc. and its wholly-owned subsidiary, The Foothills Bank, a community bank based in Yuma, Arizona. The business combinations were accounted for using the acquisition method, with the results of operations included in the Company’s consolidated financial statements as of the acquisition dates. For additional information relating to recent mergers and acquisitions, see Note 22. Pending Acquisition On September 30, 2019, the Company announced the signing of a definitive agreement to acquire State Bank Corp., the parent company of State Bank of Arizona, a community bank based in Lake Havasu City, Arizona (collectively, “SBAZ” ). SBAZ provides banking services to individuals and businesses in Arizona with locations in Bullhead City, Cottonwood, Kingman, Lake Havasu City, Phoenix, Prescott Valley and Prescott. As of December 31, 2019, SBAZ had total assets of $677,654,000, gross loans of $439,237,000 and total deposits of $586,688,000. The acquisition has received regulatory approvals, is subject to other customary conditions of closing and is expected to be completed in the first quarter of 2020. Upon closing of the transaction, SBAZ will merge into the Company's Foothills Bank division and will expand the Company's footprint in Arizona to cover all major markets in the state and be a leading community bank in Arizona.
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, 2019 was $50,055,000.
Debt Securities	Debt 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 securities held primarily for the purpose of selling in the near term are classified as trading securities and are reported at fair value, with unrealized gains and losses included in income. Debt 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 (“OCI”). Premiums and discounts on debt 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 debt 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 debt 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 debt 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 debt 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 debt securities, see Note 2.
Temporary versus Other-Than-Temporary Impairment	Temporary versus Other-Than-Temporary Impairment The Company assesses individual debt securities in its investment portfolio for impairment at least on a quarterly basis, and more frequently when economic or market conditions warrant. A debt security 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 debt 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. 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 OCI, net of tax. For held-to-maturity debt securities, the amount of an other-than-temporary impairment recorded in OCI 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 SaleLoans held for sale generally consist of long-term, fixed rate, conforming, single-family residential real estate loans intended to be sold on the secondary market. Loans held for sale are recorded at fair value as of each balance sheet date. The fair value includes the servicing value of the loans and any change in fair value is recognized in non-interest income. Fair value elections are made at the time of origination or purchase based on the Company’s fair value election policy.
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 non-accrual, 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. 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 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. 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 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 non-accrual 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 and overdraft 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 other real estate owned (“OREO”) until such time as it is sold. 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 to 40 years and the estimated useful life for furniture, fixtures, and equipment is 3 to 10 years. Interest is capitalized for any significant building projects. For additional information relating to premises and equipment, see Note 4.
Lessee Leases	Leases The Company leases certain land, premises and equipment from third parties. A lessee lease is classified as an operating lease unless it meets certain criteria (e.g., lease contains option to purchase that Company is reasonably certain to exercise), in which case it is classified as a finance lease. Effective January 1, 2019, operating leases are included in net premises and equipment and other liabilities on the Company’s statements of financial condition and lease expense for lease payments is recognized on a straight-line basis over the lease term. Finance leases are included in net premises and equipment and other borrowed funds on the Company’s statements of financial condition. Right-of-use (“ROU”) assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. An ROU asset represents the right to use the underlying asset for the lease term and also includes any direct costs and payments made prior to lease commencement and excludes lease incentives. When an implicit rate is not available, an incremental borrowing rate based on the information available at commencement date is used in determining the present value of the lease payments. A lease term may include an option to extend or terminate the lease when it is reasonably certain the option will be exercised. The Company accounts for lease and nonlease components (e.g., common-area maintenance) together as a single combined lease component for all asset classes. Short-term leases of 12 months or less are excluded from accounting guidance; as a result, the lease payments are recognized on a straight-line basis over the lease term and the leases are not reflected on the Company’s statements of financial condition. Renewal and termination options are considered when determining short-term leases. Leases are accounted for on an individual lease level.
Lessor Leases	The Company also leases certain premises and equipment to third parties. A lessor lease is classified as an operating lease unless it meets certain criteria that would classify it as either a sales-type lease or a direct financing 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 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, 2019 and 2018, 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. 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 2019 and 2018 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.
Equity Securities	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 fair value, FHLB stock is carried at cost and evaluated for impairment. 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 InsuranceThe 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. 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 previously entered into interest rate swap agreements to hedge against changes in forecasted cash flows due to interest rate exposures. In September 2019, the Company implemented a balance sheet strategy to increase its net interest income and net interest margin and early terminated its’ pay-fixed interest rate swaps. Prior to termination, the interest rate swaps were recognized as assets or liabilities on the Company’s statements of financial condition and were measured at fair value. Fair value estimates were obtained from third parties and were based on pricing models. The Company did not enter into interest rate swap agreements for trading or speculative purposes. The Company included the impact of bilateral collateral and master netting agreements that allowed 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. The Company's interest rate swaps were contracts in which a series of interest payments were exchanged over a prescribed period. The notional amount upon which the interest payments were based was not exchanged. The swap agreements were derivative instruments and converted 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 was initially reported as a component of OCI and subsequently reclassified into earnings in the same period during which the transaction affects earnings. For highly effective hedges, the ineffective portion of the gain or loss on derivative instruments, if any, would be amortized over the remaining life the hedging instrument using a systematic and rational method. During the years ended December 31, 2019, 2018, and 2017, the Company’s cash flow hedges were determined to be fully effective. Interest rate derivative financial instruments received hedge accounting treatment only if they were designated as a hedge and were expected to be, and were, 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 did not meet specified hedging criteria were recorded at fair value with changes in fair value recorded in income. The Company’s interest rate swaps were considered highly effective and met the hedge accounting criteria. Cash flows resulting from the interest rate derivative financial instruments that were accounted for as hedges of assets and liabilities were 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.
Revenue Recognition	Revenue Recognition The Company recognizes revenue when services or products are transferred to customers in an amount that reflects the consideration to which the Company expects to be entitled. The Company’s principal source of revenue is interest income from debt securities and loans. Revenue from contracts with customers within the scope of Accounting Standards Codification™ (“ASC”) Topic 606 was $69,877,000, $76,664,000, and $69,808,000 for the years ended December 31, 2019, 2018, and 2017, respectively, and largely consisted of revenue from service charges and other fees from deposits (e.g., overdraft fees, ATM fees, debit card fees). Due to the short-term nature of the Company’s contracts with customers, an insignificant amount of receivables related to such revenue was recorded at December 31, 2019 and 2018 and there were no impairment losses recognized. Policies specific to revenue from contracts with customers include the following: Service Charges. Revenue from service charges consists of service charges and fees on deposit accounts under depository agreements with customers to provide access to deposited funds and, when applicable, pay interest on deposits. Service charges on deposit accounts may be transactional or non-transactional in nature. Transactional service charges occur in the form of a service or penalty and are charged upon the occurrence of an event (e.g., overdraft fees, ATM fees, wire transfer fees). Transactional service charges are recognized as services are delivered to and consumed by the customer, or as penalty fees are charged. Non-transactional service charges are charges that are based on a broader service, such as account maintenance fees and dormancy fees, and are recognized on a monthly basis.
Stock-based Compensation	Stock-based Compensation Stock-based compensation awards granted, comprised of restricted stock units and stock options, are valued at fair value and compensation cost is recognized on a straight-line basis over the requisite service period of each award. The impact of forfeitures of stock-based compensation awards on compensation expense is recognized as forfeitures occur. 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.
Comprehensive Income	Comprehensive Income Comprehensive income consists of net income and OCI. OCI includes unrealized gains and losses, net of tax effect, on available-for-sale securities and derivatives used for cash flow hedges. For additional information relating to OCI, see Note 16.
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 units 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 2018 and 2017 financial statements to conform to the 2019 presentation.
Accounting Guidance Adopted in 2019 and Pending Adoption at December 31, 2019	Accounting Guidance Adopted in 2019 The ASC is the Financial Accounting Standards Board’s (“FASB”) 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 Accounting Standards Updates (“ASU”) that may have had a material effect on the Company’s financial position or results of operations. ASU 2017-08 - Receivables - Nonrefundable Fees and Other Costs. In March 2017, FASB amended ASC Subtopic 310-20 to shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments required the premium to be amortized to the earliest call date instead of the maturity date. The amendments did not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The amendments were effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2018 and any adjustments were to be reflected as of the beginning of the year that includes the interim period. Entities were to apply the amendments on a modified retrospective basis; therefore, a cumulative-effect reduction to retained earnings of $24,102,000 was recognized as of the January 1, 2019 effective date. The Company’s debt securities that were effected by the amendments were primarily in the state and local governments category. The Company’s accounting policies and procedures were updated to reflect the amendments. ASU 2016-02 - Leases. In February 2016, FASB amended ASC Topic 842 to 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 were effective for public business entities for the first interim and annual reporting periods beginning after December 15, 2018. The Company has lease agreements for which the amendments required the recognition of a lease liability to make lease payments and an ROU asset which represents its right to use the underlying asset for the lease term. An entity is permitted to elect not to restate its comparative periods in the period of adoption when transitioning to ASC Topic 842 and the Company made this election. In addition, the Company made the following elections related to implementation: 1) to not use hindsight in determining lease terms and in assessing impairment of ROU assets; and 2) to use the practical expedient package, which required no reassessment of whether existing contracts are or contain leases as well as no reassessment of lease classification for existing leases. At the date of adoption, the Company recognized an ROU asset and related lease liability on the Company’s statement of financial condition of $36,178,000 and $38,220,000, respectively. The Company developed new processes to comply with the accounting and disclosure requirements of such amendments and policies and procedures were updated accordingly. Accounting Guidance Pending Adoption at December 31, 2019 The following paragraphs provide descriptions of newly issued but not yet effective ASUs that could have a material effect on the Company’s financial position or results of operations. ASU 2017-04 - Intangibles - Goodwill and Other. In January 2017, FASB amended ASC Topic 350 to 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 third quarter of 2019, the Company performed its impairment assessment and determined the fair value of the aggregated reporting units exceeded the carrying value, such that the Company’s goodwill was not considered im paired. 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. ASU 2016-13 - Financial Instruments - Credit Losses. In June 2016, FASB amended ASC Topic 326 to 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. As a result of the adoption of the amendments, the ALLL will be referred to as t he allowance for credit losses (“ACL”). The Company has evaluated the impact of these amendments to the Company’s financial position and results of operations and has determined the estimated range of the ACL will be between $125,600,000 and $131,300,000 and the estimated allowance for unfunded commitments will be between $12,800,000 and $13,600,000 upon adoption of the amendments. An adjustment to retained earnings, net of tax, will be required for the difference b etween such estimated amounts and the balances at December 31, 2019. The estimated impact to retained earnings on the date of adoption is approximately $9,955,000 to $14,808,000. The Company had developed internal implementation controls over the development of the ACL model and resulting financial statement disclosures. As part of the implementation of the amendments, the Company has adjusted its processes and procedures to calculate the ACL, 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 has also developed new procedures for determining an allowance for credit losses relating to held-to-maturity debt securities. In addition, the current accounting policy and procedures for other-than-temporary impairment on available-for-sale debt securities were replaced with an allowance approach. The Company engaged a third-party vendor solution and is currently in the final phases of evaluating the solution including model validation, adjusting assumptions utilized, and reviewing the accuracy of the financial statement disclosures. The project team is refining its processes and procedures which will continue during the first quarter of 2020. For additional information on the ALLL, see Note 3.

Debt Securities (Tables)

Debt Securities (Tables)	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Amortized cost, gross unrealized gains and losses and the fair value of debt securities	The following tables present the amortized cost, the gross unrealized gains and losses and the fair value of the Company’s debt securities: December 31, 2019 Amortized Gross Unrealized Fair (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 20,061 48 (65) 20,044 U.S. government sponsored enterprises 42,724 953 — 43,677 State and local governments 679,784 22,694 (80) 702,398 Corporate bonds 155,665 1,938 (1) 157,602 Residential mortgage-backed securities 731,766 7,507 (549) 738,724 Commercial mortgage-backed securities 891,374 22,825 (1,392) 912,807 Total available-for-sale 2,521,374 55,965 (2,087) 2,575,252 Held-to-maturity State and local governments 224,611 9,785 — 234,396 Total held-to-maturity 224,611 9,785 — 234,396 Total debt securities $ 2,745,985 65,750 (2,087) 2,809,648 December 31, 2018 Amortized Gross Unrealized Fair (Dollars in thousands) Gains Losses Available-for-sale U.S. government and federal agency $ 23,757 54 (162) 23,649 U.S. government sponsored enterprises 120,670 52 (514) 120,208 State and local governments 844,636 18,936 (11,322) 852,250 Corporate bonds 292,052 378 (1,613) 290,817 Residential mortgage-backed securities 808,537 628 (16,250) 792,915 Commercial mortgage-backed securities 490,868 3,312 (2,356) 491,824 Total available-for-sale 2,580,520 23,360 (32,217) 2,571,663 Held-to-maturity State and local governments 297,915 1,380 (11,039) 288,256 Total held-to-maturity 297,915 1,380 (11,039) 288,256 Total debt securities $ 2,878,435 24,740 (43,256) 2,859,919
Amortized cost and fair value of debt securities by contractual maturity	The following table presents the amortized cost and fair value of available-for-sale and held-to-maturity debt securities by contractual maturity at December 31, 2019. Actual maturities may differ from expected or contractual maturities since issuers have the right to prepay obligations with or without prepayment penalties. December 31, 2019 Available-for-Sale Held-to-Maturity (Dollars in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 62,317 62,555 — — Due after one year through five years 170,631 174,195 12,841 13,383 Due after five years through ten years 206,056 214,517 71,708 75,771 Due after ten years 459,230 472,454 140,062 145,242 898,234 923,721 224,611 234,396 Mortgage-backed securities 1 1,623,140 1,651,531 — — Total $ 2,521,374 2,575,252 224,611 234,396 ______________________________ 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 debt securities and associated gains and losses	Proceeds from sales and calls of debt 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 debt securities $ 928,710 265,587 280,783 Gross realized gains 1 18,936 443 3,369 Gross realized losses 1 (4,513) (455) (4,005) Held-to-maturity Proceeds from calls of debt securities 58,750 79,000 23,020 Gross realized gains 1 2 101 204 Gross realized losses 1 (10) (1,202) (228) ______________________________ 1 The gain or loss on the sale or call of each debt security is determined by the specific identification method.
Summary of debt securities with an unrealized loss position	Debt securities with an unrealized loss position are summarized as follows: December 31, 2019 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Available-for-sale U.S. government and federal agency $ 464 — 9,902 (65) 10,366 (65) State and local governments 19,044 (80) — — 19,044 (80) Corporate bonds 7,378 (1) — — 7,378 (1) Residential mortgage-backed securities 85,562 (234) 29,038 (315) 114,600 (549) Commercial mortgage-backed securities 177,051 (1,293) 7,697 (99) 184,748 (1,392) Total available-for-sale $ 289,499 (1,608) 46,637 (479) 336,136 (2,087) December 31, 2018 Less than 12 Months 12 Months or More Total (Dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Available-for-sale U.S. government and federal agency $ 4,287 (27) 10,519 (135) 14,806 (162) U.S. government sponsored enterprises 43,400 (103) 35,544 (411) 78,944 (514) State and local governments 72,080 (922) 232,244 (10,400) 304,324 (11,322) Corporate bonds 119,111 (937) 114,800 (676) 233,911 (1,613) Residential mortgage-backed securities 132,405 (833) 537,202 (15,417) 669,607 (16,250) Commercial mortgage-backed securities 73,118 (402) 86,504 (1,954) 159,622 (2,356) Total available-for-sale $ 444,401 (3,224) 1,016,813 (28,993) 1,461,214 (32,217) Held-to-maturity State and local governments $ 87,392 (2,778) 126,226 (8,261) 213,618 (11,039) Total held-to-maturity $ 87,392 (2,778) 126,226 (8,261) 213,618 (11,039)

Loans Receivable, Net (Tables)

Loans Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Summary of loans receivable	The following table presents loans receivable for each portfolio class of loans: (Dollars in thousands) December 31, December 31, Residential real estate loans $ 926,388 887,742 Commercial loans Real estate 5,579,307 4,657,561 Other commercial 2,094,254 1,911,171 Total 7,673,561 6,568,732 Consumer and other loans Home equity 617,201 544,688 Other consumer 295,660 286,387 Total 912,861 831,075 Loans receivable 9,512,810 8,287,549 Allowance for loan and lease losses (124,490) (131,239) Loans receivable, net $ 9,388,320 8,156,310 Net deferred origination (fees) costs included in loans receivable $ (6,964) (5,685) Net purchase accounting (discounts) premiums included in loans receivable $ (21,574) (25,172)
Summary of the activity in the ALLL	The following tables summarize the activity in the ALLL by loan class: Year ended December 31, 2019 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 131,239 10,631 72,448 38,160 5,811 4,189 Provision for loan losses 57 (163) (2,704) (23) (863) 3,810 Charge-offs (15,178) (608) (2,460) (4,189) (90) (7,831) Recoveries 8,372 251 2,212 2,181 79 3,649 Balance at end of period $ 124,490 10,111 69,496 36,129 4,937 3,817 Year ended December 31, 2018 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 129,568 10,798 68,515 39,303 6,204 4,748 Provision for loan losses 9,953 474 4,343 1,916 (471) 3,691 Charge-offs (17,807) (728) (3,469) (5,045) (210) (8,355) Recoveries 9,525 87 3,059 1,986 288 4,105 Balance at end of period $ 131,239 10,631 72,448 38,160 5,811 4,189 Year ended December 31, 2017 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 129,572 12,436 65,773 37,823 7,572 5,968 Provision for loan losses 10,824 (1,521) 7,152 2,545 (1,103) 3,751 Charge-offs (19,331) (199) (6,188) (2,856) (489) (9,599) Recoveries 8,503 82 1,778 1,791 224 4,628 Balance at end of period $ 129,568 10,798 68,515 39,303 6,204 4,748
Summary of recorded investment in loans and the balance in the ALLL	The following tables disclose the recorded investment in loans and the balance in the ALLL by loan class: December 31, 2019 (Dollars in thousands) Total Residential Commercial Other Home Other Loans receivable Individually evaluated for impairment $ 94,504 7,804 58,609 21,475 3,745 2,871 Collectively evaluated for impairment 9,418,306 918,584 5,520,698 2,072,779 613,456 292,789 Total loans receivable $ 9,512,810 926,388 5,579,307 2,094,254 617,201 295,660 ALLL Individually evaluated for impairment $ 95 — 73 10 — 12 Collectively evaluated for impairment 124,395 10,111 69,423 36,119 4,937 3,805 Total ALLL $ 124,490 10,111 69,496 36,129 4,937 3,817 December 31, 2018 (Dollars in thousands) Total Residential Commercial Other Home Other Loans receivable Individually evaluated for impairment $ 108,788 12,685 68,837 20,975 3,497 2,794 Collectively evaluated for impairment 8,178,761 875,057 4,588,724 1,890,196 541,191 283,593 Total loans receivable $ 8,287,549 887,742 4,657,561 1,911,171 544,688 286,387 ALLL Individually evaluated for impairment $ 3,223 83 568 2,313 39 220 Collectively evaluated for impairment 128,016 10,548 71,880 35,847 5,772 3,969 Total ALLL $ 131,239 10,631 72,448 38,160 5,811 4,189
Loan portfolio aging analysis	The following tables present an aging analysis of the recorded investment in loans by loan class: December 31, 2019 (Dollars in thousands) Total Residential Commercial Other Home Other Accruing loans 30-59 days past due $ 15,944 3,403 4,946 4,685 1,040 1,870 Accruing loans 60-89 days past due 7,248 749 2,317 1,190 1,902 1,090 Accruing loans 90 days or more past due 1,412 753 64 143 — 452 Non-accrual loans 30,883 4,715 15,650 6,592 3,266 660 Total past due and non-accrual loans 55,487 9,620 22,977 12,610 6,208 4,072 Current loans receivable 9,457,323 916,768 5,556,330 2,081,644 610,993 291,588 Total loans receivable $ 9,512,810 926,388 5,579,307 2,094,254 617,201 295,660 December 31, 2018 (Dollars in thousands) Total Residential Commercial Other Home Other Accruing loans 30-59 days past due $ 24,312 5,251 9,477 4,282 3,213 2,089 Accruing loans 60-89 days past due 9,255 860 3,231 3,838 735 591 Accruing loans 90 days or more past due 2,018 788 — 492 428 310 Non-accrual loans 47,252 8,021 27,264 8,619 2,575 773 Total past due and non-accrual loans 82,837 14,920 39,972 17,231 6,951 3,763 Current loans receivable 8,204,712 872,822 4,617,589 1,893,940 537,737 282,624 Total loans receivable $ 8,287,549 887,742 4,657,561 1,911,171 544,688 286,387
Summary of the impaired loans	The following tables disclose information related to impaired loans by loan class: At or for the Year ended December 31, 2019 (Dollars in thousands) Total Residential Commercial Other Home Other Loans with a specific valuation allowance Recorded balance $ 5,388 — 5,343 10 — 35 Unpaid principal balance 5,388 — 5,343 10 — 35 Specific valuation allowance 95 — 73 10 — 12 Average balance 10,378 409 6,341 3,490 24 114 Loans without a specific valuation allowance Recorded balance 89,116 7,804 53,266 21,465 3,745 2,836 Unpaid principal balance 99,355 9,220 57,735 24,758 4,494 3,148 Average balance 93,338 9,879 59,107 18,079 3,486 2,787 Total Recorded balance 94,504 7,804 58,609 21,475 3,745 2,871 Unpaid principal balance 104,743 9,220 63,078 24,768 4,494 3,183 Specific valuation allowance 95 — 73 10 — 12 Average balance 103,716 10,288 65,448 21,569 3,510 2,901 At or for the Year ended December 31, 2018 (Dollars in thousands) Total Residential Commercial Other Home Other Loans with a specific valuation allowance Recorded balance $ 19,197 1,957 9,345 7,268 120 507 Unpaid principal balance 19,491 2,220 9,345 7,268 120 538 Specific valuation allowance 3,223 83 568 2,313 39 220 Average balance 19,519 2,686 8,498 7,081 82 1,172 Loans without a specific valuation allowance Recorded balance 89,591 10,728 59,492 13,707 3,377 2,287 Unpaid principal balance 107,486 11,989 71,300 17,689 3,986 2,522 Average balance 106,747 10,269 73,889 17,376 3,465 1,748 Total Recorded balance 108,788 12,685 68,837 20,975 3,497 2,794 Unpaid principal balance 126,977 14,209 80,645 24,957 4,106 3,060 Specific valuation allowance 3,223 83 568 2,313 39 220 Average balance 126,266 12,955 82,387 24,457 3,547 2,920
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, 2019 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 18 1 6 6 2 3 Pre-modification recorded balance $ 18,508 117 8,524 9,382 214 271 Post-modification recorded balance $ 18,476 123 8,524 9,364 214 251 TDRs that subsequently defaulted Number of loans 1 — 1 — — — Recorded balance $ 106 — 106 — — — Year ended December 31, 2018 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 25 4 8 10 2 1 Pre-modification recorded balance $ 21,995 724 12,901 7,813 252 305 Post-modification recorded balance $ 21,881 724 12,787 7,813 252 305 TDRs that subsequently defaulted Number of loans 1 1 — — — — Recorded balance $ 47 47 — — — — Year ended December 31, 2017 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 32 5 13 11 2 1 Pre-modification recorded balance $ 41,521 841 31,109 9,403 158 10 Post-modification recorded balance $ 38,838 841 28,426 9,403 158 10 TDRs that subsequently defaulted Number of loans 1 — — 1 — — Recorded balance $ 18 — — 18 — —

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 December 31, 2018 Land $ 52,738 47,511 Buildings and construction in progress 251,151 231,854 Furniture, fixtures and equipment 96,576 90,030 Leasehold improvements 11,144 9,370 Accumulated depreciation (148,373) (137,237) Net premises and equipment, excluding ROU assets 263,236 241,528 ROU assets 47,073 — Net premises and equipment $ 310,309 241,528
Lease Summary	The following table summarizes the Company’s leases: December 31, 2019 (Dollars in thousands) Finance Operating ROU assets $ 6,537 Accumulated depreciation (917) Net ROU assets $ 5,620 41,453 Lease liabilities $ 5,671 43,904 Weighted-average remaining lease term 24 years 19 years Weighted-average discount rate 3.0 % 3.7 %
Maturities of Lease Liabilities	Maturities of lease liabilities consist of the following: December 31, 2019 (Dollars in thousands) Finance Operating Maturing within one year $ 335 3,965 Maturing one year through two years 257 3,761 Maturing two years through three years 255 3,473 Maturing three years through four years 261 3,123 Maturing four years through five years 268 3,130 Thereafter 6,797 45,336 Total lease payments 8,173 62,788 Present value of lease payments Short-term 170 2,421 Long-term 5,501 41,483 Total present value of lease payments 5,671 43,904 Difference between lease payments and present value of lease payments $ 2,502 18,884
Components of Lease Expense	The components of lease expense consist of the following: Year ended (Dollars in thousands) December 31, Finance lease cost Amortization of ROU assets $ 101 Interest on lease liabilities 34 Operating lease cost 4,063 Short-term lease cost 431 Variable lease cost 896 Sublease income (6) Total lease expense $ 5,519
Supplemental Cash Flow Information	Supplemental cash flow information related to leases is as follows: Year ended December 31, 2019 (Dollars in thousands) Finance Operating Cash paid for amounts included in the measurement of lease liabilities Operating cash flows $ 34 2,136 Financing cash flows 98 N/A ______________________________ N/A - Not applicable

Other Intangible Assets and G_2

Other Intangible Assets and Goodwill (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of 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 $ 85,506 62,977 21,649 Accumulated amortization (22,220) (13,735) (7,465) Net carrying value $ 63,286 49,242 14,184 Aggregate amortization expense $ 8,485 6,270 2,494 Estimated amortization expense for the years ending December 31, 2020 $ 9,978 2021 9,519 2022 9,029 2023 8,276 2024 7,535
Changes in the carrying value of goodwill	The following schedule 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 $ 289,586 177,811 147,053 Acquisitions and adjustments 166,832 111,775 30,758 Net carrying value at end of period $ 456,418 289,586 177,811

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2019
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 $ 84,390 80,123 Accrued interest receivable 63 96 Other assets 54,692 45,779 Total assets $ 139,145 125,998 Liabilities Other borrowed funds $ 23,149 14,527 Accrued interest payable 36 1 Other liabilities 123 125 Total liabilities $ 23,308 14,653
Future Unfunded Contingent Commitments	Future unfunded contingent commitments related to the Company’s LIHTC investments at December 31, 2019 are as follows: (Dollars in thousands) Amount Years ending December 31, 2020 $ 11,916 2021 7,692 2022 7,471 2023 130 2024 309 Thereafter 419 Total $ 27,937
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. Years ended (Dollars in thousands) December 31, 2019 December 31, 2018 December 31, Amortization expense $ 6,289 4,926 2,507 Tax credits and other tax benefits recognized 8,547 6,550 3,827

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2019
Deposits [Abstract]
Scheduled maturities of time deposits	The scheduled maturities of time deposits are as follows: (Dollars in thousands) Amount Years ending December 31, 2020 $ 706,520 2021 150,925 2022 55,809 2023 23,584 2024 21,513 Thereafter 150 $ 958,501

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Carrying Value of Repurchase Agreements by Maturity and Category of Collateral	The following tables summarize the carrying value of the Company’s repurchase agreements by remaining contractual maturity and category of collateral: December 31, 2019 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total Residential mortgage-backed securities $ 312,015 — 312,015 Commercial mortgage-backed securities 257,809 — 257,809 Total $ 569,824 — 569,824 December 31, 2018 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous Up to 30 Days Total Residential mortgage-backed securities $ 328,174 — 328,174 Commercial mortgage-backed securities 66,339 1,638 67,977 Total $ 394,513 1,638 396,151
Maturities of FHLB Advances	The scheduled maturities of FHLB advances consist of the following: December 31, 2019 December 31, 2018 (Dollars in thousands) Amount Weighted Amount Weighted Maturing within one year $ 31,492 1.81 % $ 285,847 2.63 % Maturing one year through two years 5,000 2.95 % 1,572 3.50 % Maturing two years through three years 889 5.25 % 150,370 3.77 % Maturing three years through four years 165 5.45 % 918 5.25 % Maturing four years through five years 780 4.31 % 204 5.45 % Thereafter 285 6.31 % 1,264 4.82 % Total $ 38,611 2.14 % $ 440,175 3.03 %

Subordinated Debentures (Tables

Subordinated Debentures (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Instruments [Abstract]
Summary of Subordinated Debentures	The Company’s subordinated debentures are reflected in the table below. The amounts include fair value adjustments from acquisitions. December 31, 2019 Rate Structure Maturity (Dollars in thousands) Balance Rate Subordinated debentures owed to trust subsidiaries First Company Statutory Trust 2001 $ 3,395 5.227 % 3 month LIBOR plus 3.30% 07/31/2031 First Company Statutory Trust 2003 2,497 5.197 % 3 month LIBOR plus 3.25% 03/26/2033 Glacier Capital Trust II 46,393 4.736 % 3 month LIBOR plus 2.75% 04/07/2034 Citizens (ID) Statutory Trust I 5,155 4.550 % 3 month LIBOR plus 2.65% 06/17/2034 Glacier Capital Trust III 36,083 3.276 % 3 month LIBOR plus 1.29% 04/07/2036 Glacier Capital Trust IV 30,928 3.464 % 3 month LIBOR plus 1.57% 09/15/2036 Bank of the San Juans Bancorporation Trust I 1,970 3.734 % 3 month LIBOR plus 1.82% 03/01/2037 FNB (UT) Statutory Trust I 4,124 5.061 % 3 month LIBOR plus 3.10% 06/26/2033 FNB (UT) Statutory Trust II 1,752 3.614 % 3 month LIBOR plus 1.72% 12/15/2036 Total subordinated debentures owed to trust subsidiaries 132,297 Tier 2 subordinated debentures 7,617 6.625 % Fixed 10/01/2025 Total subordinated debentures $ 139,914

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Pre-Tax Gains or Losses	The following table presents the pre-tax gains or losses recorded in OCI 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 (loss) gain recognized in OCI $ (7,047) 3,286 444 Amount of loss reclassified from OCI to interest expense (10,816) (2,334) (4,892)
Offsetting Assets	The following table discloses the offsetting of financial assets and interest rate swap derivative assets. December 31, 2019 December 31, 2018 (Dollars in thousands) Gross Amount of Recognized Assets Gross Amount Offset in the Statements of Financial Position Net Amounts of Assets Presented in the Statements of Financial Position Gross Amount of Recognized Assets Gross Amount Offset in the Statements of Financial Position Net Amounts of Assets Presented in the Statements of Financial Position Interest rate swaps $ — — — 139 (139) —
Offsetting Liabilities	The following table discloses the offsetting of financial liabilities and interest rate swap derivative liabilities. December 31, 2019 December 31, 2018 (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 $ — — — 3,908 (139) 3,769

Regulatory Capital (Tables)

Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 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 $ 1,661,249 14.95 % $ 888,986 8.00 % N/A N/A Glacier Bank 1,625,527 14.64 % 888,110 8.00 % $ 1,110,137 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated 1,528,683 13.76 % 666,740 6.00 % N/A N/A Glacier Bank 1,500,461 13.52 % 666,082 6.00 % 888,110 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated 1,398,183 12.58 % 500,055 4.50 % N/A N/A Glacier Bank 1,500,461 13.52 % 499,562 4.50 % 721,589 6.50 % Tier 1 capital (to average assets) Consolidated 1,528,683 11.65 % 524,987 4.00 % N/A N/A Glacier Bank 1,500,461 11.50 % 522,040 4.00 % 652,550 5.00 % December 31, 2018 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 $ 1,437,889 14.70 % $ 782,453 8.00 % N/A N/A Glacier Bank 1,401,991 14.35 % 781,430 8.00 % $ 976,787 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated 1,308,017 13.37 % 586,840 6.00 % N/A N/A Glacier Bank 1,279,778 13.10 % 586,072 6.00 % 781,430 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated 1,183,517 12.10 % 440,130 4.50 % N/A N/A Glacier Bank 1,279,778 13.10 % 439,554 4.50 % 634,911 6.50 % Tier 1 capital (to average assets) Consolidated 1,308,017 11.35 % 461,130 4.00 % N/A N/A Glacier Bank 1,279,778 11.08 % 462,072 4.00 % 577,590 5.00 % ______________________________ N/A - Not applicable

Stock-based Compensation Plan (

Stock-based Compensation Plan (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Activity for restricted stock units	The following table summarizes the restricted stock unit activity for the year ended December 31, 2019: Restricted Weighted- Non-vested at December 31, 2018 181,983 $ 36.03 Granted 101,978 42.96 Vested (103,473) 34.17 Forfeited (3,827) 40.80 Non-vested at December 31, 2019 176,661 41.01
Activity for stock options	Changes in shares granted for stock options for the year ended December 31, 2019 are summarized as follows: Stock Weighted- Outstanding at December 31, 2018 26,167 $ 25.84 Acquisitions 235,246 16.70 Exercised (175,161) 16.53 Forfeited (2,787) 25.84 Outstanding at December 31, 2019 83,465 19.61 Exercisable at December 31, 2019 72,315 18.65

Other Expenses (Tables)

Other Expenses (Tables)	12 Months Ended
	Dec. 31, 2019
Other Expenses [Abstract]
Schedule of Other Expenses	Other expenses consists of the following: Years ended (Dollars in thousands) December 31, December 31, December 31, Mergers and acquisition expenses $ 8,503 6,618 2,130 Consulting and outside services 8,276 7,219 5,331 Debit card expenses 5,968 5,104 7,189 Employee expenses 5,138 4,412 4,160 Telephone 4,827 4,487 3,891 Business development 4,446 4,172 3,333 VIE amortization and other expenses 4,341 3,618 3,109 Loan expenses 4,140 3,462 3,080 Postage 3,437 3,104 2,684 Printing and supplies 3,256 3,264 2,661 Checking and operating expenses 1,757 1,234 1,760 Accounting and audit fees 1,712 1,456 1,848 ATM expenses 1,700 1,217 1,720 Legal fees 1,245 1,763 1,106 Other 4,029 3,164 3,043 Total other expenses $ 62,775 54,294 47,045

Federal and State Income Taxes

Federal and State Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
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 $ 34,461 21,510 29,555 State 14,545 11,960 9,183 Total current income tax expense 49,006 33,470 38,738 Deferred 1 Federal (279) 5,372 22,246 State (77) 1,489 3,641 Total deferred income tax (benefit) expense (356) 6,861 25,887 Total income tax expense $ 48,650 40,331 64,625 ______________________________
Summary of effective tax rate	Combined federal and state income tax expense differs from that computed at the federal statutory corporate income tax rate as follows: Years ended December 31, December 31, December 31, Federal statutory rate 21.0 % 21.0 % 35.0 % State taxes, net of federal income tax benefit 4.4 % 4.8 % 4.6 % Tax rate change — % — % 10.9 % Tax-exempt interest income (3.7 %) (5.0 %) (10.5 %) Tax credits (4.5 %) (4.2 %) (3.2 %) Other, net 1.6 % 1.6 % (1.1 %) Effective income tax rate 18.8 % 18.2 % 35.7 %
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 $ 31,698 33,313 Operating lease liabilities 11,127 — Deferred compensation 7,447 6,251 Employee benefits 6,646 5,652 Acquisition fair market value adjustments 5,480 6,380 Net operating loss carryforwards 2,209 2,525 Available-for-sale debt securities — 2,244 Other 3,891 3,841 Total gross deferred tax assets 68,498 60,206 Deferred tax liabilities Intangibles (16,469) (12,667) Depreciation of premises and equipment (13,987) (10,776) Available-for-sale debt securities (13,652) — Operating lease ROU assets (10,506) — Deferred loan costs (7,311) (6,436) FHLB stock dividends (1,486) (2,722) Other (3,050) (4,041) Total gross deferred tax liabilities (66,461) (36,642) Net deferred tax asset $ 2,037 23,564
Income tax return jurisdictions and years subject to examination	The following schedule summarizes the years that remain subject to examination as of December 31, 2019: Years ended December 31, Federal 2005, 2008, 2010, 2011, 2012, 2013, 2016, 2017 and 2018 Montana 2016, 2017 and 2018 Idaho 2016, 2017 and 2018 Utah 2016, 2017 and 2018 Colorado 2010, 2011, 2012, 2015, 2016, 2017 and 2018 Arizona 2015, 2016, 2017 and 2018

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Activity within Accumulated Other Comprehensive Loss, Net of Tax	The following table illustrates the activity within accumulated other comprehensive income (loss) by component, net of tax: (Dollars in thousands) Gains (Losses) on Available-For-Sale Debt Securities Losses on Derivatives Used for Cash Flow Hedges Total Balance at January 1, 2017 $ 1,639 (9,021) (7,382) Other comprehensive income before reclassifications 2,110 248 2,358 Reclassification adjustments for losses included in net income 391 3,005 3,396 Reclassifications to retained earnings 1 891 (1,242) (351) Net current period other comprehensive income 3,392 2,011 5,403 Balance at December 31, 2017 $ 5,031 (7,010) (1,979) Other comprehensive (loss) income before reclassifications (11,653) 2,453 (9,200) Reclassification adjustments for losses included in net income 9 1,743 1,752 Net current period other comprehensive (loss) income (11,644) 4,196 (7,448) Balance at December 31, 2018 $ (6,613) (2,814) (9,427) Other comprehensive income (loss) before reclassifications 57,607 (5,261) 52,346 Reclassification adjustments for (gains) losses included in net income (10,768) 8,075 (2,693) Net current period other comprehensive income 46,839 2,814 49,653 Balance at December 31, 2019 $ 40,226 — 40,226 ______________________________ 1 Reclassifications were due to the one-time revaluation of the net deferred tax asset as a result of the Tax Act. For additional information on the Tax Act, see Note 15.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
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 $ 210,544 181,878 116,377 Average outstanding shares - basic 88,255,290 83,603,515 77,537,664 Add: dilutive restricted stock units and stock options 130,485 73,670 69,941 Average outstanding shares - diluted 88,385,775 83,677,185 77,607,605 Basic earnings per share $ 2.39 2.18 1.50 Diluted earnings per share $ 2.38 2.17 1.50 Restricted stock units and stock options excluded from the diluted average outstanding share calculation 1 — 1,357 — ______________________________ 1 Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock units or the exercise price of a stock option exceeds the market price of the Company’s stock.

Parent Holding Company Inform_2

Parent Holding Company Information (Condensed) (Tables)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information 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 $ 23,491 22,000 Interest bearing cash deposits 34,345 42,299 Cash and cash equivalents 57,836 64,299 Other assets 12,966 12,639 Investment in subsidiaries 2,063,011 1,612,115 Total assets $ 2,133,813 1,689,053 Liabilities and Stockholders’ Equity Dividends payable $ 18,821 25,726 Subordinated debentures 139,914 134,051 Other liabilities 14,345 13,422 Total liabilities 173,080 173,199 Common stock 923 845 Paid-in capital 1,378,534 1,051,253 Retained earnings 541,050 473,183 Accumulated other comprehensive income (loss) 40,226 (9,427) Total stockholders’ equity 1,960,733 1,515,854 Total liabilities and stockholders’ equity $ 2,133,813 1,689,053
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 $ 142,000 153,574 119,000 Intercompany charges for services 20,661 16,523 14,299 Other income 513 1,284 228 Total income 163,174 171,381 133,527 Expenses Compensation and employee benefits 25,806 20,873 17,864 Other operating expenses 15,118 12,201 10,425 Total expenses 40,924 33,074 28,289 Income before income tax benefit and equity in undistributed net income of subsidiaries 122,250 138,307 105,238 Income tax benefit 4,488 3,773 2,983 Income before equity in undistributed net income of subsidiaries 126,738 142,080 108,221 Equity in undistributed net income of subsidiaries 83,806 39,798 8,156 Net Income $ 210,544 181,878 116,377 Comprehensive Income $ 260,197 174,430 122,131
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 $ 210,544 181,878 116,377 Adjustments to reconcile net income to net cash provided by operating activities: Subsidiary income in excess of dividends distributed (83,806) (39,798) (8,156) Stock-based compensation, net of tax benefits 1,320 1,219 1,460 Net change in other assets and other liabilities 1,854 (3,209) 5,191 Net cash provided by operating activities 129,912 140,090 114,872 Investing Activities Sales of available-for-sale debt securities — — 27 Net additions of premises and equipment (114) (300) (79) Proceeds from sale of marketable equity securities 89 — 114 Equity contributions to subsidiaries (13,485) (24,989) (17,565) Net cash used in investing activities (13,510) (25,289) (17,503) Financing Activities Net decrease in other borrowed funds — (11,543) — Cash dividends paid (124,468) (85,493) (111,720) Tax withholding payments for stock-based compensation (1,293) (1,214) (1,531) Proceeds from stock option exercises 2,896 24 — Net cash used in financing activities (122,865) (98,226) (113,251) Net (decrease) increase in cash, cash equivalents and restricted cash (6,463) 16,575 (15,882) Cash, cash equivalents and restricted cash at beginning of period 64,299 47,724 63,606 Cash, cash equivalents and restricted cash at end of period $ 57,836 64,299 47,724

Unaudited Quarterly Financial_2

Unaudited Quarterly Financial Data (Condensed) (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Summarized unaudited quarterly financial data	Summarized unaudited quarterly financial data is as follows: Quarters ended 2019 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 126,116 132,385 142,395 145,281 Interest expense 10,904 12,089 10,947 8,833 Net interest income 115,212 120,296 131,448 136,448 Provision for loan losses 57 — — — Net interest income after provision for loan losses 115,155 120,296 131,448 136,448 Non-interest income 28,474 30,834 43,049 28,417 Non-interest expense 82,830 86,170 110,675 95,252 Income before income taxes 60,799 64,960 63,822 69,613 Federal and state income tax expense 11,667 12,568 12,212 12,203 Net income $ 49,132 52,392 51,610 57,410 Basic earnings per share $ 0.58 0.61 0.57 0.62 Diluted earnings per share $ 0.58 0.61 0.57 0.62 Quarters ended 2018 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 103,066 117,715 122,905 125,310 Interest expense 7,774 9,161 9,160 9,436 Net interest income 95,292 108,554 113,745 115,874 Provision for loan losses 795 4,718 3,194 1,246 Net interest income after provision for loan losses 94,497 103,836 110,551 114,628 Non-interest income 26,086 31,828 32,416 28,494 Non-interest expense 73,627 81,795 82,829 81,876 Income before income taxes 46,956 53,869 60,138 61,246 Federal and state income tax expense 8,397 9,485 10,802 11,647 Net income $ 38,559 44,384 49,336 49,599 Basic earnings per share $ 0.48 0.53 0.58 0.59 Diluted earnings per share $ 0.48 0.52 0.58 0.59

Fair Value of Assets and Liab_2

Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
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 (Dollars in thousands) Fair Value December 31, 2019 Quoted Prices Significant Significant Debt securities, available-for-sale U.S. government and federal agency $ 20,044 — 20,044 — U.S. government sponsored enterprises 43,677 — 43,677 — State and local governments 702,398 — 702,398 — Corporate bonds 157,602 — 157,602 — Residential mortgage-backed securities 738,724 — 738,724 — Commercial mortgage-backed securities 912,807 — 912,807 — Loans held for sale, at fair value 69,194 — 69,194 — Total assets measured at fair value on a recurring basis $ 2,644,446 — 2,644,446 — Fair Value Measurements (Dollars in thousands) Fair Value December 31, 2018 Quoted Prices Significant Significant Debt securities, available-for-sale U.S. government and federal agency $ 23,649 — 23,649 — U.S. government sponsored enterprises 120,208 — 120,208 — State and local governments 852,250 — 852,250 — Corporate bonds 290,817 — 290,817 — Residential mortgage-backed securities 792,915 — 792,915 — Commercial mortgage-backed securities 491,824 — 491,824 — Loans held for sale, at fair value 33,156 — 33,156 — Total assets measured at fair value on a recurring basis $ 2,604,819 — 2,604,819 — Interest rate swaps $ 3,769 — 3,769 — Total liabilities measured at fair value on a recurring basis $ 3,769 — 3,769 —
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 (Dollars in thousands) Fair Value December 31, 2019 Quoted Prices Significant Significant Other real estate owned $ 1,983 — — 1,983 Collateral-dependent impaired loans, net of ALLL 23 — — 23 Total assets measured at fair value on a non-recurring basis $ 2,006 — — 2,006 Fair Value Measurements (Dollars in thousands) Fair Value December 31, 2018 Quoted Prices Significant Significant Other real estate owned $ 1,011 — — 1,011 Collateral-dependent impaired loans, net of ALLL 6,985 — — 6,985 Total assets measured at fair value on a non-recurring basis $ 7,996 — — 7,996
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 $ 1,983 Sales comparison approach Selling costs 6.0% - 10.0% (7.3%) Adjustment to comparables 0.0% - 11.1% (4.5%) Collateral-dependent $ 9 Cost approach Selling costs 10.0% - 10.0% (10.0%) 14 Sales comparison approach Adjustment to comparables 0.0% - 0.0% (0.0%) $ 23 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 $ 1,011 Sales comparison approach Selling costs 8.0% - 15.0% (9.2%) Collateral-dependent impaired loans, net of ALLL $ 2,384 Sales comparison approach Selling costs 8.0% - 20.0% (9.9%) 4,601 Combined approach Selling costs 10.0% - 10.0% (10.0%) $ 6,985 ______________________________ 1 The range for selling cost inputs represents reductions to the fair value of the assets.
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 not carried at fair value. Receivables and payables due in one year or less, equity securities without readily determinable fair values and deposits with no defined or contractual maturities are excluded. Fair Value Measurements (Dollars in thousands) Carrying Amount December 31, 2019 Quoted Prices Significant Significant Financial assets Cash and cash equivalents $ 330,961 330,961 — — Debt securities, held-to-maturity 224,611 — 234,396 — Loans receivable, net of ALLL 9,388,320 — — 9,438,121 Total financial assets $ 9,943,892 330,961 234,396 9,438,121 Financial liabilities Term deposits $ 1,011,798 — 1,017,505 — FHLB advances 38,611 — 38,787 — Repurchase agreements and other borrowed funds 598,644 — 598,644 — Subordinated debentures 139,914 — 124,094 — Total financial liabilities $ 1,788,967 — 1,779,030 — Fair Value Measurements (Dollars in thousands) Carrying Amount December 31, 2018 Quoted Prices Significant Significant Financial assets Cash and cash equivalents $ 203,790 203,790 — — Debt securities, held-to-maturity 297,915 — 288,256 — Loans receivable, net of ALLL 8,156,310 — — 8,079,112 Total financial assets $ 8,658,015 203,790 288,256 8,079,112 Financial liabilities Term deposits $ 1,070,208 — 1,069,777 — FHLB advances 440,175 — 439,615 — Repurchase agreements and other borrowed funds 410,859 — 410,859 — Subordinated debentures 134,051 — 120,302 — Total financial liabilities $ 2,055,293 — 2,040,553 —

Contingencies and Commitments (

Contingencies and Commitments (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Outstanding commitments	The Company had the following outstanding commitments: (Dollars in thousands) December 31, December 31, Unused lines of credit $ 2,422,828 1,948,516 Letters of credit 59,845 45,263 Total outstanding commitments $ 2,482,673 1,993,779

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Consideration transferred, identifiable net assets acquired and resulting goodwill	The following table discloses the fair value estimates of the consideration transferred, the total identifiable net assets acquired and the resulting goodwill arising from the acquisitions: (Dollars in thousands) Heritage FNB FSB February 28, 2018 Collegiate January 31, 2018 Fair value of consideration transferred Fair value of Company shares issued $ 229,385 87,153 181,043 69,764 Cash consideration 16,420 4 — 16,265 Effective settlement of a pre-existing relationship — — — 10,054 Total fair value of consideration transferred 245,805 87,157 181,043 96,083 Recognized amounts of identifiable assets acquired and liabilities assumed Identifiable assets acquired Cash and cash equivalents 84,446 11,311 24,397 93,136 Debt securities 103,231 47,247 271,865 42,177 Loans receivable 615,279 245,485 627,767 354,252 Core deposit intangible 1 13,566 8,963 31,053 10,275 Accrued income and other assets 35,891 24,848 78,274 15,911 Total identifiable assets acquired 852,413 337,854 1,033,356 515,751 Liabilities assumed Deposits 722,220 274,646 877,586 437,171 Borrowings 2 — 7,273 36,880 12,509 Accrued expenses and other liabilities 9,919 10,079 14,175 5,435 Total liabilities assumed 732,139 291,998 928,641 455,115 Total identifiable net assets 120,274 45,856 104,715 60,636 Goodwill recognized $ 125,531 41,301 76,328 35,447 ______________________________ 1 The core deposit intangible for each acquisition was determined to have an estimated life of 10 years . 2 Borrowings assumed with the FSB acquisition included Tier 2 subordinated debentures of $5,864,000 .
Unaudited Pro Forma Summary of the Company as if the 2019 Acquisitions had Occurred at the Beginning of the Period	The following unaudited pro forma summary presents consolidated information of the Company as if the Heritage and FNB acquisitions had occurred on January 1, 2018: Year ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income 662,937 608,787 Net income 216,045 209,004
Unaudited Pro Forma Summary of the Company as if the 2018 Acquisitions had Occurred at the Beginning of the Period	The following unaudited pro forma summary presents consolidated information of the Company as if the FSB and Collegiate acquisitions had occurred on January 1, 2017: Years ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income $ 560,979 520,634 Net income 177,267 138,042

Nature of Operations and Summ_3

Nature of Operations and Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2019USD ($)quarterstepreporting_unitoperating_segmentdivision	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Jan. 01, 2020USD ($)
Number of Bank Divisions | division	16
Number of Operating Segments | operating_segment	1
Total assets	$ 13,683,999,000	$ 12,115,484,000
Gross loans	$ 9,512,810,000	8,287,549,000
Maximum Period of Original Maturity to be Included in Cash and Cash Equivalents	three months
Federal Reserve Balance or Cash on Hand Required	$ 50,055,000
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
Minimum Number of Days Delinquent to Charge off Loans	120 days
Maximum Term Leases Will Be Considered Short-term	12 months
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
Revenue from Contracts with Customers	$ 69,877,000	76,664,000	$ 69,808,000
Impairment losses on receivables related to contracts with customers	$ 0	$ 0
Percentage of likelihood for term more likely than not as it relates to income taxes	50.00%
State Bank of Arizona
Total assets	$ 677,654,000
Gross loans	439,237,000
Total deposits	586,688,000
Accounting Standards Update 2017-08
Effect of cumulative change on retained earnings from applying new accounting pronouncement	24,102,000
Accounting Standards Update 2016-02
Effect of cumulative change on assets from applying new accounting pronouncement	36,178,000
Effect of cumulative change on liabilities from applying new accounting pronouncement	$ 38,220,000
Minimum Range
Number of years for home equity loan origination term	10
Minimum Range | Accounting Standards Update 2016-13 | Forecast
Estimated ACL upon adoption of the new accounting standard				$ 125,600,000
Estimated allowance for unfunded commitments upon adoption of the new accounting standard				12,800,000
Estimated effect of cumulative change on retained earnings from applying new accounting pronouncement				9,955,000
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 | Accounting Standards Update 2016-13 | Forecast
Estimated ACL upon adoption of the new accounting standard				131,300,000
Estimated allowance for unfunded commitments upon adoption of the new accounting standard				13,600,000
Estimated effect of cumulative change on retained earnings from applying new accounting pronouncement				$ 14,808,000
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

Amortized Cost, Gross Unrealize

Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale
Amortized Cost	$ 2,521,374	$ 2,580,520
Gross Unrealized Gains	55,965	23,360
Gross Unrealized Losses	(2,087)	(32,217)
Total	2,575,252	2,571,663
Held-to-maturity
Amortized Cost	224,611	297,915
Gross Unrealized Gains	9,785	1,380
Gross Unrealized Losses	0	(11,039)
Fair Value	234,396	288,256
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]
Amortized Cost	2,745,985	2,878,435
Gross Unrealized Gains	65,750	24,740
Gross Unrealized Losses	(2,087)	(43,256)
Fair Value	2,809,648	2,859,919
U.S. government and federal agency
Available-for-sale
Amortized Cost	20,061	23,757
Gross Unrealized Gains	48	54
Gross Unrealized Losses	(65)	(162)
Total	20,044	23,649
U.S. government sponsored enterprises
Available-for-sale
Amortized Cost	42,724	120,670
Gross Unrealized Gains	953	52
Gross Unrealized Losses	0	(514)
Total	43,677	120,208
State and local governments
Available-for-sale
Amortized Cost	679,784	844,636
Gross Unrealized Gains	22,694	18,936
Gross Unrealized Losses	(80)	(11,322)
Total	702,398	852,250
Held-to-maturity
Amortized Cost	224,611	297,915
Gross Unrealized Gains	9,785	1,380
Gross Unrealized Losses	0	(11,039)
Fair Value	234,396	288,256
Corporate bonds
Available-for-sale
Amortized Cost	155,665	292,052
Gross Unrealized Gains	1,938	378
Gross Unrealized Losses	(1)	(1,613)
Total	157,602	290,817
Residential mortgage backed securities
Available-for-sale
Amortized Cost	731,766	808,537
Gross Unrealized Gains	7,507	628
Gross Unrealized Losses	(549)	(16,250)
Total	738,724	792,915
Commercial mortgage backed securities
Available-for-sale
Amortized Cost	891,374	490,868
Gross Unrealized Gains	22,825	3,312
Gross Unrealized Losses	(1,392)	(2,356)
Total	$ 912,807	$ 491,824

Debt Securities Maturity Schedu

Debt Securities Maturity Schedule (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Available-for-Sale, Amortized Cost
Due within one year		$ 62,317
Due after one year through five years		170,631
Due after five years through ten years		206,056
Due after ten years		459,230
Total before mortgage-backed securities		898,234
Amortized Cost		2,521,374	$ 2,580,520
Available-for-Sale, Fair Value
Due with one year		62,555
Due after one year through five years		174,195
Due after five years through ten years		214,517
Due after ten years		472,454
Total before mortgage-backed securities		923,721
Total		2,575,252	2,571,663
Held-to-Maturity, Amortized Cost
Due within one year		0
Due after one year through five years		12,841
Due after five years through ten years		71,708
Due after ten years		140,062
Total before mortgage-backed securities		224,611
Amortized Cost		224,611	297,915
Held-to-Maturity, Fair Value
Due within one year		0
Due after one year through five years		13,383
Due after five years through ten years		75,771
Due after ten years		145,242
Total before mortgage-backed securities		234,396
Total		234,396	$ 288,256
Mortgage-backed securities
Available-for-Sale, Amortized Cost
Mortgage-backed securities	[1]	1,623,140
Available-for-Sale, Fair Value
Mortgage-backed securities	[1]	1,651,531
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.

Gain or Loss on Sale of Debt Se

Gain or Loss on Sale of Debt Securities (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale
Proceeds from Sales and Calls of Debt Securities		$ 928,710	$ 265,587	$ 280,783
Gross realized gains	[1]	18,936	443	3,369
Gross realized losses	[1]	(4,513)	(455)	(4,005)
Held-to-maturity
Proceeds from calls of debt securities		58,750	79,000	23,020
Gross realized gains	[1]	2	101	204
Gross realized losses	[1]	$ (10)	$ (1,202)	$ (228)
[1]	The gain or loss on the sale or call of each debt security is determined by the specific identification method.

Debt Securities with an Unreali

Debt Securities with an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale, Fair Value
Less than 12 Months	$ 289,499	$ 444,401
12 Months or More	46,637	1,016,813
Total	336,136	1,461,214
Available-for-sale, Unrealized Loss
Less than 12 Months	(1,608)	(3,224)
12 Months or Longer	(479)	(28,993)
Total	(2,087)	(32,217)
Held-to-maturity, Fair Value
Less than 12 Months		87,392
12 Months or More		126,226
Total		213,618
Held-to-maturity, Unrealized Loss
Less than 12 Months		(2,778)
12 Months or More		(8,261)
Total		(11,039)
U.S. government and federal agency
Available-for-sale, Fair Value
Less than 12 Months	464	4,287
12 Months or More	9,902	10,519
Total	10,366	14,806
Available-for-sale, Unrealized Loss
Less than 12 Months	0	(27)
12 Months or Longer	(65)	(135)
Total	(65)	(162)
U.S. government sponsored enterprises
Available-for-sale, Fair Value
Less than 12 Months		43,400
12 Months or More		35,544
Total		78,944
Available-for-sale, Unrealized Loss
Less than 12 Months		(103)
12 Months or Longer		(411)
Total		(514)
State and local governments
Available-for-sale, Fair Value
Less than 12 Months	19,044	72,080
12 Months or More	0	232,244
Total	19,044	304,324
Available-for-sale, Unrealized Loss
Less than 12 Months	(80)	(922)
12 Months or Longer	0	(10,400)
Total	(80)	(11,322)
Held-to-maturity, Fair Value
Less than 12 Months		87,392
12 Months or More		126,226
Total		213,618
Held-to-maturity, Unrealized Loss
Less than 12 Months		(2,778)
12 Months or More		(8,261)
Total		(11,039)
Corporate bonds
Available-for-sale, Fair Value
Less than 12 Months	7,378	119,111
12 Months or More	0	114,800
Total	7,378	233,911
Available-for-sale, Unrealized Loss
Less than 12 Months	(1)	(937)
12 Months or Longer	0	(676)
Total	(1)	(1,613)
Residential mortgage backed securities
Available-for-sale, Fair Value
Less than 12 Months	85,562	132,405
12 Months or More	29,038	537,202
Total	114,600	669,607
Available-for-sale, Unrealized Loss
Less than 12 Months	(234)	(833)
12 Months or Longer	(315)	(15,417)
Total	(549)	(16,250)
Commercial mortgage backed securities
Available-for-sale, Fair Value
Less than 12 Months	177,051	73,118
12 Months or More	7,697	86,504
Total	184,748	159,622
Available-for-sale, Unrealized Loss
Less than 12 Months	(1,293)	(402)
12 Months or Longer	(99)	(1,954)
Total	$ (1,392)	$ (2,356)

Debt Securities (Details Textua

Debt Securities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Transfer of debt securities from held-to-maturity to available-for-sale	$ 0	$ 270,331,000	$ 0
Debt securities pledged as collateral	1,475,752,000	1,333,455,000
Other-than-temporary impairment on debt securities	$ 0	$ 0

Loans Receivable, Net Summary o

Loans Receivable, Net Summary of Loans Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Summary of Loans Receivable
Loans receivable	$ 9,512,810	$ 8,287,549
Allowance for loan and lease losses	(124,490)	(131,239)
Loans receivable, net	9,388,320	8,156,310
Net deferred origination (fees) costs included in loans receivable	(6,964)	(5,685)
Net purchase accounting (discounts) premiums included in loans receivable	(21,574)	(25,172)
Residential Real Estate | Residential Real Estate
Summary of Loans Receivable
Loans receivable	926,388	887,742
Allowance for loan and lease losses	(10,111)	(10,631)
Commercial
Summary of Loans Receivable
Loans receivable	7,673,561	6,568,732
Commercial | Commercial Real Estate
Summary of Loans Receivable
Loans receivable	5,579,307	4,657,561
Allowance for loan and lease losses	(69,496)	(72,448)
Commercial | Other Commercial
Summary of Loans Receivable
Loans receivable	2,094,254	1,911,171
Allowance for loan and lease losses	(36,129)	(38,160)
Consumer and Other
Summary of Loans Receivable
Loans receivable	912,861	831,075
Consumer and Other | Home Equity
Summary of Loans Receivable
Loans receivable	617,201	544,688
Allowance for loan and lease losses	(4,937)	(5,811)
Consumer and Other | Other Consumer
Summary of Loans Receivable
Loans receivable	295,660	286,387
Allowance for loan and lease losses	$ (3,817)	$ (4,189)

ALLL Activity (Details)

ALLL Activity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for loan and lease losses
Balance at beginning of period				$ 131,239				$ 129,568	$ 131,239	$ 129,568	$ 129,572
Provision for loan losses	$ 0	$ 0	$ 0	57	$ 1,246	$ 3,194	$ 4,718	795	57	9,953	10,824
Charge-offs									(15,178)	(17,807)	(19,331)
Recoveries									8,372	9,525	8,503
Balance at end of period	124,490				131,239				124,490	131,239	129,568
Residential Real Estate | Residential Real Estate
Allowance for loan and lease losses
Balance at beginning of period				10,631				10,798	10,631	10,798	12,436
Provision for loan losses									(163)	474	(1,521)
Charge-offs									(608)	(728)	(199)
Recoveries									251	87	82
Balance at end of period	10,111				10,631				10,111	10,631	10,798
Commercial | Commercial Real Estate
Allowance for loan and lease losses
Balance at beginning of period				72,448				68,515	72,448	68,515	65,773
Provision for loan losses									(2,704)	4,343	7,152
Charge-offs									(2,460)	(3,469)	(6,188)
Recoveries									2,212	3,059	1,778
Balance at end of period	69,496				72,448				69,496	72,448	68,515
Commercial | Other Commercial
Allowance for loan and lease losses
Balance at beginning of period				38,160				39,303	38,160	39,303	37,823
Provision for loan losses									(23)	1,916	2,545
Charge-offs									(4,189)	(5,045)	(2,856)
Recoveries									2,181	1,986	1,791
Balance at end of period	36,129				38,160				36,129	38,160	39,303
Consumer and Other | Home Equity
Allowance for loan and lease losses
Balance at beginning of period				5,811				6,204	5,811	6,204	7,572
Provision for loan losses									(863)	(471)	(1,103)
Charge-offs									(90)	(210)	(489)
Recoveries									79	288	224
Balance at end of period	4,937				5,811				4,937	5,811	6,204
Consumer and Other | Other Consumer
Allowance for loan and lease losses
Balance at beginning of period				$ 4,189				$ 4,748	4,189	4,748	5,968
Provision for loan losses									3,810	3,691	3,751
Charge-offs									(7,831)	(8,355)	(9,599)
Recoveries									3,649	4,105	4,628
Balance at end of period	$ 3,817				$ 4,189				$ 3,817	$ 4,189	$ 4,748

Loans Receivable, Net ALLL and

Loans Receivable, Net ALLL and Loans Receivable Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans Receivable and Allowance for Loan and Lease Losses
Individually evaluated for impairment	$ 94,504	$ 108,788
Collectively evaluated for impairment	9,418,306	8,178,761
Total loans receivable	9,512,810	8,287,549
Individually evaluated for impairment	95	3,223
Collectively evaluated for impairment	124,395	128,016
Total ALLL	124,490	131,239
Residential Real Estate | Residential Real Estate
Loans Receivable and Allowance for Loan and Lease Losses
Individually evaluated for impairment	7,804	12,685
Collectively evaluated for impairment	918,584	875,057
Total loans receivable	926,388	887,742
Individually evaluated for impairment	0	83
Collectively evaluated for impairment	10,111	10,548
Total ALLL	10,111	10,631
Commercial
Loans Receivable and Allowance for Loan and Lease Losses
Total loans receivable	7,673,561	6,568,732
Commercial | Commercial Real Estate
Loans Receivable and Allowance for Loan and Lease Losses
Individually evaluated for impairment	58,609	68,837
Collectively evaluated for impairment	5,520,698	4,588,724
Total loans receivable	5,579,307	4,657,561
Individually evaluated for impairment	73	568
Collectively evaluated for impairment	69,423	71,880
Total ALLL	69,496	72,448
Commercial | Other Commercial
Loans Receivable and Allowance for Loan and Lease Losses
Individually evaluated for impairment	21,475	20,975
Collectively evaluated for impairment	2,072,779	1,890,196
Total loans receivable	2,094,254	1,911,171
Individually evaluated for impairment	10	2,313
Collectively evaluated for impairment	36,119	35,847
Total ALLL	36,129	38,160
Consumer and Other
Loans Receivable and Allowance for Loan and Lease Losses
Total loans receivable	912,861	831,075
Consumer and Other | Home Equity
Loans Receivable and Allowance for Loan and Lease Losses
Individually evaluated for impairment	3,745	3,497
Collectively evaluated for impairment	613,456	541,191
Total loans receivable	617,201	544,688
Individually evaluated for impairment	0	39
Collectively evaluated for impairment	4,937	5,772
Total ALLL	4,937	5,811
Consumer and Other | Other Consumer
Loans Receivable and Allowance for Loan and Lease Losses
Individually evaluated for impairment	2,871	2,794
Collectively evaluated for impairment	292,789	283,593
Total loans receivable	295,660	286,387
Individually evaluated for impairment	12	220
Collectively evaluated for impairment	3,805	3,969
Total ALLL	$ 3,817	$ 4,189

Loans Receivable Aging Analysis

Loans Receivable Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loan portfolio aging analysis
Non-accrual loans	$ 30,883	$ 47,252
Total past due and non-accrual loans	55,487	82,837
Current loans receivable	9,457,323	8,204,712
Total loans receivable	9,512,810	8,287,549
Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	15,944	24,312
Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	7,248	9,255
Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	1,412	2,018
Residential Real Estate | Residential Real Estate
Loan portfolio aging analysis
Non-accrual loans	4,715	8,021
Total past due and non-accrual loans	9,620	14,920
Current loans receivable	916,768	872,822
Total loans receivable	926,388	887,742
Residential Real Estate | Residential Real Estate | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	3,403	5,251
Residential Real Estate | Residential Real Estate | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	749	860
Residential Real Estate | Residential Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	753	788
Commercial
Loan portfolio aging analysis
Total loans receivable	7,673,561	6,568,732
Commercial | Commercial Real Estate
Loan portfolio aging analysis
Non-accrual loans	15,650	27,264
Total past due and non-accrual loans	22,977	39,972
Current loans receivable	5,556,330	4,617,589
Total loans receivable	5,579,307	4,657,561
Commercial | Commercial Real Estate | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	4,946	9,477
Commercial | Commercial Real Estate | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	2,317	3,231
Commercial | Commercial Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	64	0
Commercial | Other Commercial
Loan portfolio aging analysis
Non-accrual loans	6,592	8,619
Total past due and non-accrual loans	12,610	17,231
Current loans receivable	2,081,644	1,893,940
Total loans receivable	2,094,254	1,911,171
Commercial | Other Commercial | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	4,685	4,282
Commercial | Other Commercial | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	1,190	3,838
Commercial | Other Commercial | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	143	492
Consumer and Other
Loan portfolio aging analysis
Total loans receivable	912,861	831,075
Consumer and Other | Home Equity
Loan portfolio aging analysis
Non-accrual loans	3,266	2,575
Total past due and non-accrual loans	6,208	6,951
Current loans receivable	610,993	537,737
Total loans receivable	617,201	544,688
Consumer and Other | Home Equity | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	1,040	3,213
Consumer and Other | Home Equity | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	1,902	735
Consumer and Other | Home Equity | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	0	428
Consumer and Other | Other Consumer
Loan portfolio aging analysis
Non-accrual loans	660	773
Total past due and non-accrual loans	4,072	3,763
Current loans receivable	291,588	282,624
Total loans receivable	295,660	286,387
Consumer and Other | Other Consumer | Accruing loans 30 to 59 days past due
Loan portfolio aging analysis
Past due loans	1,870	2,089
Consumer and Other | Other Consumer | Accruing loans 60 to 89 days past due
Loan portfolio aging analysis
Past due loans	1,090	591
Consumer and Other | Other Consumer | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Past due loans	$ 452	$ 310

Impaired Loans (Details)

Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	$ 5,388	$ 19,197
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	5,388	19,491
Specific valuation allowance	95	3,223
Loans with a Specific Valuation Allowance, Average Balance	10,378	19,519
Loans without a Specific Valuation Allowance, Recorded Balance	89,116	89,591
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	99,355	107,486
Loans without a Specific Valuation Allowance, Average Balance	93,338	106,747
Recorded balance	94,504	108,788
Unpaid principal balance	104,743	126,977
Average balance	103,716	126,266
Residential Real Estate | Residential Real Estate
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	0	1,957
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	0	2,220
Specific valuation allowance	0	83
Loans with a Specific Valuation Allowance, Average Balance	409	2,686
Loans without a Specific Valuation Allowance, Recorded Balance	7,804	10,728
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	9,220	11,989
Loans without a Specific Valuation Allowance, Average Balance	9,879	10,269
Recorded balance	7,804	12,685
Unpaid principal balance	9,220	14,209
Average balance	10,288	12,955
Commercial | Commercial Real Estate
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	5,343	9,345
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	5,343	9,345
Specific valuation allowance	73	568
Loans with a Specific Valuation Allowance, Average Balance	6,341	8,498
Loans without a Specific Valuation Allowance, Recorded Balance	53,266	59,492
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	57,735	71,300
Loans without a Specific Valuation Allowance, Average Balance	59,107	73,889
Recorded balance	58,609	68,837
Unpaid principal balance	63,078	80,645
Average balance	65,448	82,387
Commercial | Other Commercial
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	10	7,268
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	10	7,268
Specific valuation allowance	10	2,313
Loans with a Specific Valuation Allowance, Average Balance	3,490	7,081
Loans without a Specific Valuation Allowance, Recorded Balance	21,465	13,707
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	24,758	17,689
Loans without a Specific Valuation Allowance, Average Balance	18,079	17,376
Recorded balance	21,475	20,975
Unpaid principal balance	24,768	24,957
Average balance	21,569	24,457
Consumer and Other | Home Equity
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	0	120
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	0	120
Specific valuation allowance	0	39
Loans with a Specific Valuation Allowance, Average Balance	24	82
Loans without a Specific Valuation Allowance, Recorded Balance	3,745	3,377
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	4,494	3,986
Loans without a Specific Valuation Allowance, Average Balance	3,486	3,465
Recorded balance	3,745	3,497
Unpaid principal balance	4,494	4,106
Average balance	3,510	3,547
Consumer and Other | Other Consumer
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	35	507
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	35	538
Specific valuation allowance	12	220
Loans with a Specific Valuation Allowance, Average Balance	114	1,172
Loans without a Specific Valuation Allowance, Recorded Balance	2,836	2,287
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	3,148	2,522
Loans without a Specific Valuation Allowance, Average Balance	2,787	1,748
Recorded balance	2,871	2,794
Unpaid principal balance	3,183	3,060
Average balance	$ 2,901	$ 2,920

Troubled Debt Restructurings (D

Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Loan	Dec. 31, 2018USD ($)Loan	Dec. 31, 2017USD ($)Loan
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	18	25	32
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 18,508	$ 21,995	$ 41,521
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 18,476	$ 21,881	$ 38,838
TDRs that Subsequently Defaulted, Number of Loans | Loan	1	1	1
TDRs that Subsequently Defaulted, Recorded Balance	$ 106	$ 47	$ 18
Residential Real Estate | Residential Real Estate
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	1	4	5
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 117	$ 724	$ 841
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 123	$ 724	$ 841
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	1	0
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 47	$ 0
Commercial | Commercial Real Estate
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	6	8	13
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 8,524	$ 12,901	$ 31,109
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 8,524	$ 12,787	$ 28,426
TDRs that Subsequently Defaulted, Number of Loans | Loan	1	0	0
TDRs that Subsequently Defaulted, Recorded Balance	$ 106	$ 0	$ 0
Commercial | Other Commercial
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	6	10	11
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 9,382	$ 7,813	$ 9,403
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 9,364	$ 7,813	$ 9,403
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	0	1
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 0	$ 18
Consumer and Other | Home Equity
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	2	2	2
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 214	$ 252	$ 158
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 214	$ 252	$ 158
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	0	0
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 0	$ 0
Consumer and Other | Other Consumer
Troubled Debt Restructurings
Troubled Debt Restructurings, Number of Loans | Loan	3	1	1
Troubled Debt Restructurings, Pre-Modification Recorded Balance	$ 271	$ 305	$ 10
Troubled Debt Restructurings, Post-Modification Recorded Balance	$ 251	$ 305	$ 10
TDRs that Subsequently Defaulted, Number of Loans | Loan	0	0	0
TDRs that Subsequently Defaulted, Recorded Balance	$ 0	$ 0	$ 0

Loans Receivable, Net (Details

Loans Receivable, Net (Details Textual)	12 Months Ended
	Dec. 31, 2019USD ($)portfolio_segment	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Loans Receivable
Number of segments in the Company's loan portfolio | portfolio_segment	3
Loans pledged as collateral	$ 5,228,136,000
Percentage of consolidated stockholders equity exceeding which no borrower had outstanding loans or commitments	10.00%
Loans serviced for others	$ 185,897,000	$ 181,281,000
Aggregate amount of loans outstanding to related parties	57,825,000	59,528,000
New loans to related parties	17,504,000
Repayments of loans by related parties	19,207,000
TDR With Pre Modification Loan Balance for Which Oreo Was Received	2,992,000	6,793,000	$ 5,987,000
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process	1,744,000	350,000
OREO Secured by Residential Real Estate	1,504,000	698,000
Additional unfunded commitments on TDRs	3,933,000	5,335,000
Charge-offs on TDRs	$ 709,000	$ 1,685,000	$ 2,984,000

Premises and Equipment, Net of

Premises and Equipment, Net of Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Premises and Equipment, Net of Accumulated Depreciation
Accumulated depreciation	$ (148,373)	$ (137,237)
Net premises and equipment, excluding ROU assets	263,236	241,528
ROU assets	47,073	0
Net premises and equipment	310,309	241,528
Land
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	52,738	47,511
Buildings and construction in progress
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	251,151	231,854
Furniture, fixtures and equipment
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	96,576	90,030
Leasehold improvements
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	$ 11,144	$ 9,370

Lease Summary (Details)

Lease Summary (Details) $ in Thousands	Dec. 31, 2019USD ($)
Property, Plant and Equipment [Abstract]
Finance Lease, ROU assets	$ 6,537
Finance Lease, Accumulated depreciation	(917)
Finance Lease, Right-of-Use Asset	5,620
Finance Lease, Lease liabilities	$ 5,671
Finance Lease, Weighted Average Remaining Lease Term	24 years
Finance Lease, Weighted Average Discount Rate	3.00%
Operating Lease, Net right-of-use assets	$ 41,453
Operating Lease, Lease liabilities	$ 43,904
Operating Lease, Weighted Average Remaining Lease Term	19 years
Operating Lease, Weighted Average Discount Rate	3.70%

Maturities of Lease Liabilities

Maturities of Lease Liabilities (Details) $ in Thousands	Dec. 31, 2019USD ($)
Finance Lease Liabilities, Rolling Maturity
Finance Lease, Maturing within one year	$ 335
Finance Lease, Maturing one year through two years	257
Finance Lease, Maturing two years through three years	255
Finance Lease, Maturing three years through four years	261
Finance Lease, Maturing four years through five years	268
Finance Lease, Thereafter	6,797
Finance Lease Liability, Payments, Due, Total	8,173
Finance Lease, Present Value of Lease Payments, Short-term	170
Finance Lease, Present Value of Lease Payments, Long-term	5,501
Finance Lease, Total present value of lease payments	5,671
Finance Lease, Difference between lease payments and present value of lease payments	2,502
Operating Lease Liabilities, Rolling Maturity
Operating Lease, Maturing within one year	3,965
Operating Lease, Maturing one year through two years	3,761
Operating Lease, Maturing two years through three years	3,473
Operating Lease, Maturing three years through four years	3,123
Operating Lease, Maturing four years through five years	3,130
Operating Lease, Thereafter	45,336
Lessee, Operating Lease, Liability, Payments, Due, Total	62,788
Operating Lease, Present Value of Lease Payments, Short-term	2,421
Operating Lease, Present Value of Lease Payments, Long-term	41,483
Operating Lease, Total present value of lease payments	43,904
Operating Lease, Difference between lease payments and present value of lease payments	$ 18,884

Components of Lease Expense (De

Components of Lease Expense (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Finance lease cost
Amortization of ROU assets	$ 101
Interest on lease liabilities	34
Operating lease cost	4,063
Short-term lease cost	431
Variable lease cost	896
Sublease Income	(6)
Lease, Cost, Total	$ 5,519

Supplemental Cash Flow Informat

Supplemental Cash Flow Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Property, Plant and Equipment [Abstract]
Finance Lease, Operating cash flows	$ 34
Finance Lease, Financing cash flows	98
Operating Lease, Operating cash flows	$ 2,136

Net Carrying Value of Core Depo

Net Carrying Value of Core Deposit Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Core Deposit Intangibles and Aggregate Amortization Expense
Net carrying value	$ 63,286	$ 49,242
Aggregate amortization expense	8,485	6,270	$ 2,494
Core Deposits Intangibles
Net Core Deposit Intangibles and Aggregate Amortization Expense
Gross carrying value	85,506	62,977	21,649
Accumulated amortization	(22,220)	(13,735)	(7,465)
Net carrying value	63,286	49,242	14,184
Aggregate amortization expense	8,485	$ 6,270	$ 2,494
Estimated Amortization Expense
For the year ending December 31, 2020	9,978
For the year ending December 31, 2021	9,519
For the year ending December 31, 2022	9,029
For the year ending December 31, 2023	8,276
For the year ending December 31, 2024	$ 7,535

Changes in the Carrying Value o

Changes in the Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill Roll Forward
Net carrying value at beginning of period	$ 289,586	$ 177,811	$ 147,053
Acquisitions and adjustments	166,832	111,775	30,758
Net carrying value at end of period	$ 456,418	$ 289,586	$ 177,811

Other Intangible Assets and G_3

Other Intangible Assets and Goodwill Other Intangible Assets and Goodwill (Details Textual) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Accumulated impairment charge	$ 40,159,000	$ 40,159,000
Core Deposits Intangibles
Finite-Lived Intangible Assets
Core Deposit Intangibles Acquired	$ 22,529,000	$ 41,328,000	$ 4,331,000

Variable Interest Entities VIE

Variable Interest Entities VIE Carrying Amounts Included in Financial Statements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Consolidated VIEs
Loans receivable	$ 9,512,810	$ 8,287,549
Accrued interest receivable	56,047	54,408
Other assets	81,371	76,651
Total assets	13,683,999	12,115,484
Other borrowed funds	28,820	14,708
Accrued interest payable	4,686	4,252
Other liabilities	164,954	116,526
Total liabilities	11,723,266	10,599,630
Consolidated VIEs
Consolidated VIEs
Loans receivable	84,390	80,123
Accrued interest receivable	63	96
Other assets	54,692	45,779
Total assets	139,145	125,998
Other borrowed funds	23,149	14,527
Accrued interest payable	36	1
Other liabilities	123	125
Total liabilities	$ 23,308	$ 14,653

Future Unfunded Contingent Comm

Future Unfunded Contingent Commitments (Details) $ in Thousands	Dec. 31, 2019USD ($)
Investments in Qualified Affordable Housing Projects
Unfunded contingent commitments expected to be fulfilled in 2020	$ 11,916
Unfunded contingent commitments expected to be fulfilled in 2021	7,692
Unfunded contingent commitments expected to be fulfilled in 2022	7,471
Unfunded contingent commitments expected to be fulfilled in 2023	130
Unfunded contingent commitments expected to be fulfilled in 2024	309
Unfunded contingent commitments expected to be fulfilled thereafter	419
Qualified Affordable Housing Project Investments, Commitment	$ 27,937

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments in Qualified Affordable Housing Projects
Amortization expense	$ 6,289	$ 4,926	$ 2,507
Tax credits and other tax benefits recognized	$ 8,547	$ 6,550	$ 3,827

Variable Interest Entities (Det

Variable Interest Entities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entities
Impairment losses	$ 0	$ 0	$ 0
Other assets
Variable Interest Entities
Carrying value of equity investments in LIHTCs	$ 41,521,000	$ 35,112,000
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, 2019USD ($)
Maturities of Time Deposits
For the year ending December 31, 2020	$ 706,520
For the year ending December 31, 2021	150,925
For the year ending December 31, 2022	55,809
For the year ending December 31, 2023	23,584
For the year ending December 31, 2024	21,513
Thereafter	150
Total	$ 958,501

Deposits (Details Textual)

Deposits (Details Textual) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deposits
FDIC Insurance limit	$ 250,000
Time deposits that meet or exceed FDIC Insurance limit	281,054,000	$ 244,999,000
Overdraft demand deposits reclassified as loans	5,514,000	5,992,000
Deposits with related parties	$ 21,723,000	$ 26,260,000

Borrowings Summary of Repurchas

Borrowings Summary of Repurchase Agreements (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	$ 569,824,000	$ 396,151,000
Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	569,824,000	394,513,000
Up to 30 Days
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	0	1,638,000
Residential mortgage backed securities
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	312,015,000	328,174,000
Residential mortgage backed securities | Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	312,015,000	328,174,000
Residential mortgage backed securities | Up to 30 Days
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	0	0
Commercial mortgage backed securities
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	257,809,000	67,977,000
Commercial mortgage backed securities | Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	257,809,000	66,339,000
Commercial mortgage backed securities | Up to 30 Days
Securities Sold Under Agreements to Repurchase
Repurchase Agreements	$ 0	$ 1,638,000

Scheduled Maturities of FHLB Ad

Scheduled Maturities of FHLB Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
FHLB Advances
Maturing within one year, Amount	$ 31,492	$ 285,847
Maturing within one year, Weighted rate	1.81%	2.63%
Maturing one year through two years, Amount	$ 5,000	$ 1,572
Maturing one year through two years, Weighted rate	2.95%	3.50%
Maturing two years through three years, Amount	$ 889	$ 150,370
Maturing two years through three years, Weighted rate	5.25%	3.77%
Maturing three years through four years, Amount	$ 165	$ 918
Maturing three years through four years, Weighted rate	5.45%	5.25%
Maturing four years through five years, Amount	$ 780	$ 204
Maturing four years through five years, Weighted rate	4.31%	5.45%
Thereafter, Amount	$ 285	$ 1,264
Thereafter, Weighted rate	6.31%	4.82%
Total, Amount	$ 38,611	$ 440,175
Total, Weighted rate	2.14%	3.03%

Borrowings (Details Textual)

Borrowings (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Repurchase Agreements	$ 569,824,000	$ 396,151,000
Securities Pledged for Repurchase Agreements	711,210,000	$ 511,294,000
Loss on early payment of FHLB advances	3,531,000
Lines of credit	$ 230,000,000

Subordinated Debentures (Detail

Subordinated Debentures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Terms of Subordinated Debentures
Balance	$ 139,914	$ 134,051
Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	132,297
Tier 2 subordinated debentures
Terms of Subordinated Debentures
Balance	$ 7,617
Rate at December 31, 2019	6.625%
First Company Statutory Trust 2001 | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 3,395
Rate at December 31, 2019	5.227%
LIBOR Rate Spread	3.30%
First Company Statutory Trust 2003 | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 2,497
Rate at December 31, 2019	5.197%
LIBOR Rate Spread	3.25%
Glacier Capital Trust II | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 46,393
Rate at December 31, 2019	4.736%
LIBOR Rate Spread	2.75%
Citizens (ID) Statutory Trust I | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 5,155
Rate at December 31, 2019	4.55%
LIBOR Rate Spread	2.65%
Glacier Capital Trust III | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 36,083
Rate at December 31, 2019	3.276%
LIBOR Rate Spread	1.29%
Glacier Capital Trust IV | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 30,928
Rate at December 31, 2019	3.464%
LIBOR Rate Spread	1.57%
Bank of the San Juans Bancorporation Trust I | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 1,970
Rate at December 31, 2019	3.734%
LIBOR Rate Spread	1.82%
FNB (UT) Statutory Trust I | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 4,124
Rate at December 31, 2019	5.061%
LIBOR Rate Spread	3.10%
FNB (UT) Statutory Trust II | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 1,752
Rate at December 31, 2019	3.614%
LIBOR Rate Spread	1.72%

Subordinated Debentures (Deta_2

Subordinated Debentures (Details Textual)	12 Months Ended
	Dec. 31, 2019
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
Number of Years Before Allowed to Prepay Tier 2 Subordinated Debt	5

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities Interest Rate Swap Gains or Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pre-Tax Gains or Losses
Amount of (loss) gain recognized in OCI	$ (7,047)	$ 3,286	$ 444
Interest Rate Swaps
Pre-Tax Gains or Losses
Amount of loss reclassified from OCI to interest expense	(10,816)	(2,334)	(4,892)
Interest Rate Swaps | Other Comprehensive Income
Pre-Tax Gains or Losses
Amount of (loss) gain recognized in OCI	$ (7,047)	$ 3,286	$ 444

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities Offsetting Assets (Details) - Interest Rate Swaps - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting Derivative Assets
Gross Amounts of Recognized Assets	$ 0	$ 139
Gross Amounts Offset in the Statements of Financial Position	0	(139)
Net Amounts of Assets Presented in the Statements of Financial Position	$ 0	$ 0

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities Offsetting Liabilities (Details) - Interest Rate Swaps - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting Derivative Liabilities
Gross Amounts of Recognized Liabilities	$ 0	$ 3,908
Gross Amounts Offset in the Statements of Financial Position	0	(139)
Net Amounts of Liabilities Presented in the Statements of Financial Position	$ 0	$ 3,769

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities Derivatives and Hedging Activities (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Rate Lock Commitments
Interest rate swap derivative financial instruments
Off-balance Sheet Commitments	$ 84,803,000	$ 59,974,000
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 Swaps
Interest rate swap derivative financial instruments
Forecasted Notional Amount	260,000,000
Loss on Termination of Interest Rate Swaps	9,997,000
Interest rate expense recorded on interest rate swap	5,532,000	8,013,000	$ 8,013,000
Forward commitments to sell TBA securities
Interest rate swap derivative financial instruments
Forecasted Notional Amount	$ 82,000,000	$ 40,750,000

Regulatory Capital (Details)

Regulatory Capital (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Total capital (to risk-weighted assets)
Actual, Amount	$ 1,661,249	$ 1,437,889
Actual, Ratio	14.95%	14.70%
Minimum capital requirement, Amount	$ 888,986	$ 782,453
Minimum capital requirement, Ratio	8.00%	8.00%
Tier 1 capital (to risk-weighted assets)
Actual, Amount	$ 1,528,683	$ 1,308,017
Actual, Ratio	13.76%	13.37%
Minimum capital requirement, Amount	$ 666,740	$ 586,840
Minimum capital requirement, Ratio	6.00%	6.00%
Common Equity Tier 1 (to risk-weighted assets)
Actual, Amount	$ 1,398,183	$ 1,183,517
Actual, Ratio	12.58%	12.10%
Minimum capital requirement, Amount	$ 500,055	$ 440,130
Minimum capital requirement, Ratio	4.50%	4.50%
Tier 1 capital (to average assets)
Actual, Amount	$ 1,528,683	$ 1,308,017
Actual, Ratio	11.65%	11.35%
Minimum capital requirement, Amount	$ 524,987	$ 461,130
Minimum capital requirement, Ratio	4.00%	4.00%
Glacier Bank
Total capital (to risk-weighted assets)
Actual, Amount	$ 1,625,527	$ 1,401,991
Actual, Ratio	14.64%	14.35%
Minimum capital requirement, Amount	$ 888,110	$ 781,430
Minimum capital requirement, Ratio	8.00%	8.00%
Well capitalized requirement, Amount	$ 1,110,137	$ 976,787
Well capitalized requirement, Ratio	10.00%	10.00%
Tier 1 capital (to risk-weighted assets)
Actual, Amount	$ 1,500,461	$ 1,279,778
Actual, Ratio	13.52%	13.10%
Minimum capital requirement, Amount	$ 666,082	$ 586,072
Minimum capital requirement, Ratio	6.00%	6.00%
Well capitalized requirement, Amount	$ 888,110	$ 781,430
Well capitalized requirement, Ratio	8.00%	8.00%
Common Equity Tier 1 (to risk-weighted assets)
Actual, Amount	$ 1,500,461	$ 1,279,778
Actual, Ratio	13.52%	13.10%
Minimum capital requirement, Amount	$ 499,562	$ 439,554
Minimum capital requirement, Ratio	4.50%	4.50%
Well capitalized requirement, Amount	$ 721,589	$ 634,911
Well capitalized requirement, Ratio	6.50%	6.50%
Tier 1 capital (to average assets)
Actual, Amount	$ 1,500,461	$ 1,279,778
Actual, Ratio	11.50%	11.08%
Minimum capital requirement, Amount	$ 522,040	$ 462,072
Minimum capital requirement, Ratio	4.00%	4.00%
Well capitalized requirement, Amount	$ 652,550	$ 577,590
Well capitalized requirement, Ratio	5.00%	5.00%

Regulatory Capital (Details Tex

Regulatory Capital (Details Textual)	Dec. 31, 2019
Common Equity Tier 1 (to risk-weighted assets)
Capital Conservation Buffer	2.50%

Summary of Restricted Stock Uni

Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Restricted stock unit activity for the year
Restricted Stock Non-Vested, Beginning Balance | shares	181,983
Restricted Stock, Granted | shares	101,978
Restricted Stock, Vested | shares	(103,473)
Restricted Stock, Forfeited | shares	(3,827)
Restricted Stock Non-Vested, Ending Balance | shares	176,661
Weighted-average grant date fair value
Restricted stock, weighted average grant date fair value, beginning balance | $ / shares	$ 36.03
Restricted stock, granted, weighted average grant date fair value | $ / shares	42.96
Restricted stock, vested, weighted average grant date fair value | $ / shares	34.17
Restricted stock, forfeited, weighted average grant date fair value | $ / shares	40.80
Restricted stock, weighted average grant date fair value, ending balance | $ / shares	$ 41.01

Summary of Stock Option Activit

Summary of Stock Option Activity (Details) - Stock Options	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Changes in shares granted for stock options for the year
Options outstanding, Beginning Balance | shares	26,167
Options, Acquisitions | shares	235,246
Options, Exercised | shares	(175,161)
Options, forfeited | shares	(2,787)
Options outstanding, Ending Balance | shares	83,465
Options, Exercisable | shares	72,315
Weighted-Average Exercise Price
Options outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 25.84
Options, acquisitions, weighted average exercise price | $ / shares	16.70
Options, exercised, weighted average exercise price | $ / shares	16.53
Options, forfeited, weighted average exercise price | $ / shares	25.84
Options outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares	19.61
Options exercisable, Weighted Average Exercise Price | $ / shares	$ 18.65

Stock-based Compensation Plan_2

Stock-based Compensation Plan (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-based Compensation Plans
Shares available to grant to employees and directors	2,041,367
Stock Options
Proceeds from stock option exercises	$ 2,896,000	$ 24,000	$ 0
Restricted Stock Units
Stock-based Compensation Plans
Compensation expense related to stock-based compensation plans	3,803,000	3,684,000	3,764,000
Income tax benefit related to compensation expense	$ 964,000	934,000	1,452,000
Unrecognized compensation expense, recognized over weighted-average period	2 years
Restricted Stock Units
Unrecognized compensation expense	$ 4,434,000
Fair value of units that vested	3,536,000	3,319,000	3,746,000
Tax benefit of units that vested	$ 1,124,000	1,126,000	$ 1,998,000
Average remaining contractual term on non-vested units	10 months 24 days
Aggregate intrinsic value of non-vested units	$ 8,125,000
Stock Options
Stock-based Compensation Plans
Compensation expense related to stock-based compensation plans	5,415,000	19,000
Income tax benefit related to compensation expense	$ 1,372,000	5,000
Unrecognized compensation expense, recognized over weighted-average period	1 year 4 months 24 days
Stock Options
Unrecognized compensation expense	$ 23,000
Total intrinsic value of options exercised	4,491,000	13,000
Total intrinsic value of options exercised, tax benefit	934,000	0
Proceeds from stock option exercises	$ 2,896,000	$ 24,000
Average remaining contractual term on outstanding stock options	5 years 8 months 12 days
Aggregate intrinsic value of outstanding stock options	$ 2,202,000

Employee Benefit Plans (Details

Employee Benefit Plans (Details Textual)	12 Months Ended
	Dec. 31, 2019USD ($)yearhourquarter	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
401(k) and Profit Sharing Plan
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%
Cost of plan	$ 17,227,000	$ 15,406,000	$ 10,100,000
Age of Employee | year	50
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	$ 4,236,000	4,037,000	3,224,000
401(k) and Profit Sharing Plan | Age Under 50
401(k) and Profit Sharing Plans
Maximum percentage of annual compensation allowable for contribution by eligible employees	60.00%
401(k) and Profit Sharing Plan | Age 50 and Over
401(k) and Profit Sharing Plans
Maximum percentage of annual compensation allowable for contribution by eligible employees	100.00%
Deferred Compensation Plan
401(k) and Profit Sharing Plans
Cost of plan	$ 480,000	502,000	481,000
Percentage of salary for deferral of cash payments	50.00%
Percentage of bonuses and directors fees for deferral of cash payments	100.00%
Liability related to obligations of deferred compensation plans	$ 8,660,000	8,371,000
Total amount deferred	$ 766,000	803,000	739,000
Credit earning rate as a percentage of return on equity	50.00%
Deferred Compensation Plan Acquired
401(k) and Profit Sharing Plans
Cost of plan	$ 992,000	801,000	588,000
Liability related to obligations of deferred compensation plans	17,661,000	13,651,000
Supplemental Employee Retirement Plan
401(k) and Profit Sharing Plans
Cost of plan	120,000	122,000	105,000
Company's contribution to the plan	662,000	423,000	$ 287,000
Liability related to obligations of deferred compensation plans	$ 2,713,000	$ 2,287,000
Credit earning rate as a percentage of return on equity	50.00%

Other Expenses (Details)

Other Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Expenses
Mergers and acquisition expenses	$ 8,503	$ 6,618	$ 2,130
Consulting and outside services	8,276	7,219	5,331
Debit card expenses	5,968	5,104	7,189
Employee expenses	5,138	4,412	4,160
Telephone	4,827	4,487	3,891
Business development	4,446	4,172	3,333
VIE amortization and other expenses	4,341	3,618	3,109
Loan expenses	4,140	3,462	3,080
Postage	3,437	3,104	2,684
Printing and supplies	3,256	3,264	2,661
Checking and operating expenses	1,757	1,234	1,760
Accounting and audit fees	1,712	1,456	1,848
ATM expenses	1,700	1,217	1,720
Legal fees	1,245	1,763	1,106
Other	4,029	3,164	3,043
Total other expenses	$ 62,775	$ 54,294	$ 47,045

Summary of Income Tax Expense (

Summary of Income Tax Expense (Details) - USD ($)		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
Federal										$ 34,461,000	$ 21,510,000	$ 29,555,000
State										14,545,000	11,960,000	9,183,000
Total current income tax expense										49,006,000	33,470,000	38,738,000
Deferred
Federal	[1]									(279,000)	5,372,000	22,246,000
State	[1]									(77,000)	1,489,000	3,641,000
Total deferred income tax (benefit) expense	[1]									(356,000)	6,861,000	25,887,000
Total income tax expense		$ 12,203,000	$ 12,212,000	$ 12,568,000	$ 11,667,000	$ 11,647,000	$ 10,802,000	$ 9,485,000	$ 8,397,000	48,650,000	40,331,000	64,625,000
Tax benefit of operating loss carryforwards										$ 317,000	$ 443,000	$ 644,000
[1]	Includes tax benefit of operating loss carryforwards of $317,000, $443,000 and $644,000 for the years ended December 31, 2019, 2018, and 2017, respectively.

Summary of Effective Tax Rate (

Summary of Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective income tax rate reconciliation
Federal statutory rate	21.00%	21.00%	35.00%
State taxes, net of federal income tax benefit	4.40%	4.80%	4.60%
Tax rate change	0.00%	0.00%	10.90%
Tax-exempt interest income	(3.70%)	(5.00%)	(10.50%)
Tax credits	(4.50%)	(4.20%)	(3.20%)
Other, net	1.60%	1.60%	(1.10%)
Effective income tax rate	18.80%	18.20%	35.70%

Deferred Tax Assets and Deferre

Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets
Allowance for loan and lease losses	$ 31,698	$ 33,313
Operating lease liabilities	11,127	0
Deferred compensation	7,447	6,251
Employee benefits	6,646	5,652
Acquisition fair market value adjustments	5,480	6,380
Net operating loss carryforwards	2,209	2,525
Available-for-sale debt securities	0	2,244
Other	3,891	3,841
Total gross deferred tax assets	68,498	60,206
Deferred tax liabilities
Intangibles	(16,469)	(12,667)
Depreciation of premises and equipment	(13,987)	(10,776)
Available-for-sale debt securities	(13,652)	0
Deferred Tax Liabilities Operating Lease ROU Assets	(10,506)	0
Deferred loan costs	(7,311)	(6,436)
FHLB stock dividends	(1,486)	(2,722)
Other	(3,050)	(4,041)
Total gross deferred tax liabilities	(66,461)	(36,642)
Net deferred tax asset	$ 2,037	$ 23,564

Years Subject to Examination (D

Years Subject to Examination (Details)	12 Months Ended
	Dec. 31, 2019
Federal
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2005, 2008, 2010, 2011, 2012, 2013, 2016, 2017 and 2018
Montana
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2016, 2017 and 2018
Idaho
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2016, 2017 and 2018
Utah
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2016, 2017 and 2018
Colorado
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2010, 2011, 2012, 2015, 2016, 2017 and 2018
Arizona
Income Tax Examination
Income tax return jurisdictions and years that remain subject to examination	2015, 2016, 2017 and 2018

Federal and State Income Taxe_2

Federal and State Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense Information
Federal Tax Rate Prior to Enactment of The Tax Cuts and Jobs Act	35.00%
Federal Tax Rate Subsequent to Enactment of The Tax Cuts and Jobs Act	21.00%
Income Tax Expense Attributable to Decrease in Income Tax Rate	$ 19,699,000
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
Operating Loss and Tax Credit Carryforwards
Operating Loss Carryforwards, Amount		8,038,000
Colorado
Operating Loss and Tax Credit Carryforwards
Operating Loss Carryforwards, Amount		$ 11,989,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Loss
Balance, beginning		$ (9,427)
Total other comprehensive income (loss), net of tax		49,653	$ (7,448)	$ 5,754
Balance, end		40,226	(9,427)
Available-For-Sale Debt Securities
Accumulated Other Comprehensive Loss
Balance, beginning		(6,613)	5,031	1,639
Other comprehensive income (loss) before reclassification		57,607	(11,653)	2,110
Reclassification adjustments for (gains) losses included in net income		(10,768)	9	391
Reclassifications to retained earnings	[1]			891
Total other comprehensive income (loss), net of tax		46,839	(11,644)	3,392
Balance, end		40,226	(6,613)	5,031
Derivatives Used for Cash Flow Hedges
Accumulated Other Comprehensive Loss
Balance, beginning		(2,814)	(7,010)	(9,021)
Other comprehensive income (loss) before reclassification		(5,261)	2,453	248
Reclassification adjustments for (gains) losses included in net income		8,075	1,743	3,005
Reclassifications to retained earnings	[1]			(1,242)
Total other comprehensive income (loss), net of tax		2,814	4,196	2,011
Balance, end		0	(2,814)	(7,010)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Loss
Balance, beginning		(9,427)	(1,979)	(7,382)
Other comprehensive income (loss) before reclassification		52,346	(9,200)	2,358
Reclassification adjustments for (gains) losses included in net income		(2,693)	1,752	3,396
Reclassifications to retained earnings	[1]			(351)
Total other comprehensive income (loss), net of tax		49,653	(7,448)	5,403
Balance, end		$ 40,226	$ (9,427)	$ (1,979)
[1]	Reclassifications were due to the one-time revaluation of the net deferred tax asset as a result of the Tax Act. For additional information on the Tax Act, see Note 15.

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic and Diluted Earnings Per Share
Net Income		$ 57,410	$ 51,610	$ 52,392	$ 49,132	$ 49,599	$ 49,336	$ 44,384	$ 38,559	$ 210,544	$ 181,878	$ 116,377
Average outstanding shares - basic										88,255,290	83,603,515	77,537,664
Add: dilutive restricted stock units and stock options										130,485	73,670	69,941
Average outstanding shares - diluted										88,385,775	83,677,185	77,607,605
Basic earnings per share		$ 0.62	$ 0.57	$ 0.61	$ 0.58	$ 0.59	$ 0.58	$ 0.53	$ 0.48	$ 2.39	$ 2.18	$ 1.50
Diluted earnings per share		$ 0.62	$ 0.57	$ 0.61	$ 0.58	$ 0.59	$ 0.58	$ 0.52	$ 0.48	$ 2.38	$ 2.17	$ 1.50
Restricted stock units and stock options excluded from the diluted average outstanding share calculation	[1]									0	1,357	0
[1]	Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock units or the exercise price of a stock option exceeds the market price of the Company’s stock.

Condensed Statements of Financi

Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash on hand and in banks	$ 198,639	$ 161,782
Interest bearing cash deposits	132,322	42,008
Cash and cash equivalents	330,961	203,790
Other assets	81,371	76,651
Total assets	13,683,999	12,115,484
Liabilities and Stockholders' Equity
Subordinated debentures	139,914	134,051
Other liabilities	164,954	116,526
Total liabilities	11,723,266	10,599,630
Common stock	923	845
Paid-in capital	1,378,534	1,051,253
Retained earnings	541,050	473,183
Accumulated other comprehensive income (loss)	40,226	(9,427)
Total stockholders’ equity	1,960,733	1,515,854	$ 1,199,057	$ 1,116,869
Total liabilities and stockholders’ equity	13,683,999	12,115,484
Parent Company
Assets
Cash on hand and in banks	23,491	22,000
Interest bearing cash deposits	34,345	42,299
Cash and cash equivalents	57,836	64,299
Other assets	12,966	12,639
Investment in subsidiaries	2,063,011	1,612,115
Total assets	2,133,813	1,689,053
Liabilities and Stockholders' Equity
Dividends payable	18,821	25,726
Subordinated debentures	139,914	134,051
Other liabilities	14,345	13,422
Total liabilities	173,080	173,199
Common stock	923	845
Paid-in capital	1,378,534	1,051,253
Retained earnings	541,050	473,183
Accumulated other comprehensive income (loss)	40,226	(9,427)
Total stockholders’ equity	1,960,733	1,515,854
Total liabilities and stockholders’ equity	$ 2,133,813	$ 1,689,053

Condensed Statements of Operati

Condensed Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expenses
Compensation and employee benefits									$ 222,753	$ 195,056	$ 160,506
Other operating expenses									62,775	54,294	47,045
Total expenses	$ 95,252	$ 110,675	$ 86,170	$ 82,830	$ 81,876	$ 82,829	$ 81,795	$ 73,627	374,927	320,127	265,571
Income tax benefit	(12,203)	(12,212)	(12,568)	(11,667)	(11,647)	(10,802)	(9,485)	(8,397)	(48,650)	(40,331)	(64,625)
Net Income	$ 57,410	$ 51,610	$ 52,392	$ 49,132	$ 49,599	$ 49,336	$ 44,384	$ 38,559	210,544	181,878	116,377
Comprehensive Income									260,197	174,430	122,131
Parent Company
Income
Dividends from subsidiaries									142,000	153,574	119,000
Intercompany charges for services									20,661	16,523	14,299
Other income									513	1,284	228
Total income									163,174	171,381	133,527
Expenses
Compensation and employee benefits									25,806	20,873	17,864
Other operating expenses									15,118	12,201	10,425
Total expenses									40,924	33,074	28,289
Income before income tax benefit and equity in undistributed net income of subsidiaries									122,250	138,307	105,238
Income tax benefit									4,488	3,773	2,983
Income before equity in undistributed net income of subsidiaries									126,738	142,080	108,221
Equity in undistributed net income of subsidiaries									83,806	39,798	8,156
Net Income									210,544	181,878	116,377
Comprehensive Income									$ 260,197	$ 174,430	$ 122,131

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income	$ 57,410	$ 51,610	$ 52,392	$ 49,132	$ 49,599	$ 49,336	$ 44,384	$ 38,559	$ 210,544	$ 181,878	$ 116,377
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation, net of tax benefits									7,475	3,122	2,952
Net cash provided by operating activities									226,649	280,711	254,741
Investing Activities
Sales of available-for-sale debt securities									712,113	226,842	247,748
Net additions of premises and equipment									(16,398)	(18,637)	(10,128)
Net cash used in investing activities									(42,682)	(872,420)	23,655
Financing Activities
Net increase in other borrowed funds									14,109	(5,059)	3,784
Cash dividends paid									(124,468)	(85,493)	(111,720)
Tax withholding payments for stock-based compensation									(1,293)	(1,214)	(1,531)
Proceeds from stock option exercises									2,896	24	0
Net cash used in financing activities									(56,796)	595,495	(230,933)
Net (decrease) increase in cash, cash equivalents and restricted cash									127,171	3,786	47,463
Cash, cash equivalents and restricted cash at beginning of period				203,790				200,004	203,790	200,004	152,541
Cash, cash equivalents and restricted cash at end of period	330,961				203,790				330,961	203,790	200,004
Parent Company
Operating Activities
Net income									210,544	181,878	116,377
Adjustments to reconcile net income to net cash provided by operating activities:
Subsidiary income in excess of dividends distributed									(83,806)	(39,798)	(8,156)
Stock-based compensation, net of tax benefits									1,320	1,219	1,460
Net change in other assets and other liabilities									1,854	(3,209)	5,191
Net cash provided by operating activities									129,912	140,090	114,872
Investing Activities
Sales of available-for-sale debt securities									0	0	27
Net additions of premises and equipment									(114)	(300)	(79)
Proceeds from sale of marketable equity securities									89	0	114
Equity contribution to subsidiaries									(13,485)	(24,989)	(17,565)
Net cash used in investing activities									(13,510)	(25,289)	(17,503)
Financing Activities
Net increase in other borrowed funds									0	(11,543)	0
Cash dividends paid									(124,468)	(85,493)	(111,720)
Tax withholding payments for stock-based compensation									(1,293)	(1,214)	(1,531)
Proceeds from stock option exercises									2,896	24	0
Net cash used in financing activities									(122,865)	(98,226)	(113,251)
Net (decrease) increase in cash, cash equivalents and restricted cash									(6,463)	16,575	(15,882)
Cash, cash equivalents and restricted cash at beginning of period				$ 64,299				$ 47,724	64,299	47,724	63,606
Cash, cash equivalents and restricted cash at end of period	$ 57,836				$ 64,299				$ 57,836	$ 64,299	$ 47,724

Unaudited Quarterly Financial_3

Unaudited Quarterly Financial Data (Condensed) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summarized unaudited quarterly financial data
Interest income	$ 145,281	$ 142,395	$ 132,385	$ 126,116	$ 125,310	$ 122,905	$ 117,715	$ 103,066	$ 546,177	$ 468,996	$ 375,022
Interest expense	8,833	10,947	12,089	10,904	9,436	9,160	9,161	7,774	42,773	35,531	29,864
Net interest income	136,448	131,448	120,296	115,212	115,874	113,745	108,554	95,292	503,404	433,465	345,158
Provision for loan losses	0	0	0	57	1,246	3,194	4,718	795	57	9,953	10,824
Net interest income after provision for loan losses	136,448	131,448	120,296	115,155	114,628	110,551	103,836	94,497	503,347	423,512	334,334
Non-interest income	28,417	43,049	30,834	28,474	28,494	32,416	31,828	26,086	130,774	118,824	112,239
Non-interest expense	95,252	110,675	86,170	82,830	81,876	82,829	81,795	73,627	374,927	320,127	265,571
Income before income taxes	69,613	63,822	64,960	60,799	61,246	60,138	53,869	46,956	259,194	222,209	181,002
Federal and state income tax expense	12,203	12,212	12,568	11,667	11,647	10,802	9,485	8,397	48,650	40,331	64,625
Net Income	$ 57,410	$ 51,610	$ 52,392	$ 49,132	$ 49,599	$ 49,336	$ 44,384	$ 38,559	$ 210,544	$ 181,878	$ 116,377
Basic earnings per share	$ 0.62	$ 0.57	$ 0.61	$ 0.58	$ 0.59	$ 0.58	$ 0.53	$ 0.48	$ 2.39	$ 2.18	$ 1.50
Diluted earnings per share	$ 0.62	$ 0.57	$ 0.61	$ 0.58	$ 0.59	$ 0.58	$ 0.52	$ 0.48	$ 2.38	$ 2.17	$ 1.50

Fair Value Measurements on a Re

Fair Value Measurements on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial Assets
Debt securities, available-for-sale	$ 2,575,252	$ 2,571,663
Recurring measurements
Financial Assets
Loans held for sale, at fair value	69,194	33,156
Total assets measured at fair value on a recurring basis	2,644,446	2,604,819
Financial Liabilities
Total liabilities measured at fair value on a recurring basis		3,769
Interest Rate Swaps | Recurring measurements
Financial Liabilities
Interest rate swaps		3,769
U.S. government and federal agency | Recurring measurements
Financial Assets
Debt securities, available-for-sale	20,044	23,649
U.S. government sponsored enterprises | Recurring measurements
Financial Assets
Debt securities, available-for-sale	43,677	120,208
State and local governments | Recurring measurements
Financial Assets
Debt securities, available-for-sale	702,398	852,250
Corporate bonds | Recurring measurements
Financial Assets
Debt securities, available-for-sale	157,602	290,817
Residential mortgage backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	738,724	792,915
Commercial mortgage backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	912,807	491,824
Level 1 | Recurring measurements
Financial Assets
Loans held for sale, at fair value	0	0
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
Level 1 | Interest Rate Swaps | Recurring measurements
Financial Liabilities
Interest rate swaps		0
Level 1 | U.S. government and federal agency | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 1 | U.S. government sponsored enterprises | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 1 | State and local governments | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 1 | Corporate bonds | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 1 | Residential mortgage backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 1 | Commercial mortgage backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 2 | Recurring measurements
Financial Assets
Loans held for sale, at fair value	69,194	33,156
Total assets measured at fair value on a recurring basis	2,644,446	2,604,819
Financial Liabilities
Total liabilities measured at fair value on a recurring basis		3,769
Level 2 | Interest Rate Swaps | Recurring measurements
Financial Liabilities
Interest rate swaps		3,769
Level 2 | U.S. government and federal agency | Recurring measurements
Financial Assets
Debt securities, available-for-sale	20,044	23,649
Level 2 | U.S. government sponsored enterprises | Recurring measurements
Financial Assets
Debt securities, available-for-sale	43,677	120,208
Level 2 | State and local governments | Recurring measurements
Financial Assets
Debt securities, available-for-sale	702,398	852,250
Level 2 | Corporate bonds | Recurring measurements
Financial Assets
Debt securities, available-for-sale	157,602	290,817
Level 2 | Residential mortgage backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	738,724	792,915
Level 2 | Commercial mortgage backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	912,807	491,824
Level 3 | Recurring measurements
Financial Assets
Loans held for sale, at fair value	0	0
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
Level 3 | Interest Rate Swaps | Recurring measurements
Financial Liabilities
Interest rate swaps		0
Level 3 | U.S. government and federal agency | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 3 | U.S. government sponsored enterprises | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 3 | State and local governments | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 3 | Corporate bonds | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 3 | Residential mortgage backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	0	0
Level 3 | Commercial mortgage backed securities | Recurring measurements
Financial Assets
Debt 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, 2019	Dec. 31, 2018
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned	$ 1,983	$ 1,011
Collateral-dependent impaired loans, net of ALLL	23	6,985
Total assets measured at fair value on a non-recurring basis	2,006	7,996
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	1,983	1,011
Collateral-dependent impaired loans, net of ALLL	23	6,985
Total assets measured at fair value on a non-recurring basis	$ 2,006	$ 7,996

Fair Value of Assets and Liab_3

Fair Value of Assets and Liabilities Quantitative Information about Level 3 Fair Value Measurements (Details) - Nonrecurring Measurements $ in Thousands		Dec. 31, 2019USD ($)Input	Dec. 31, 2018USD ($)Input
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		$ 1,983	$ 1,011
Collateral-dependent impaired loans, net of ALLL | $		23	6,985
Level 3
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		1,983	1,011
Collateral-dependent impaired loans, net of ALLL | $		23	6,985
Level 3 | Sales Comparison Approach
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		1,983
Level 3 | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $			1,011
Collateral-dependent impaired loans, net of ALLL | $			2,384
Level 3 | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL | $		14
Level 3 | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL | $		$ 9
Level 3 | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL | $			$ 4,601
Level 3 | Minimum Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned	[1]	0.060	0.080
Collateral-dependent impaired loans, net of ALLL		0	0.080	[1]
Level 3 | Minimum Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned		0
Level 3 | Minimum Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]	0.100
Level 3 | Minimum Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]		0.100
Level 3 | Maximum Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned	[1]	0.100	0.150
Collateral-dependent impaired loans, net of ALLL		0	0.200	[1]
Level 3 | Maximum Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned		0.111
Level 3 | Maximum Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]	0.100
Level 3 | Maximum Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]		0.100
Level 3 | Weighted Average Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned	[1]	0.073	0.092
Collateral-dependent impaired loans, net of ALLL		0	0.099	[1]
Level 3 | Weighted Average Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned		0.045
Level 3 | Weighted Average Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]	0.100
Level 3 | Weighted Average Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]		0.100
[1]	The range for selling cost inputs represents reductions to the fair value of the assets.

Carrying Amount and Fair Value

Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Carrying Amount
Financial Assets
Cash and cash equivalents	$ 330,961	$ 203,790
Debt securities, held-to-maturity	224,611	297,915
Loans receivable, net of ALLL	9,388,320	8,156,310
Total financial assets	9,943,892	8,658,015
Financial Liabilities
Term deposits	1,011,798	1,070,208
FHLB advances	38,611	440,175
Repurchase agreements and other borrowed funds	598,644	410,859
Subordinated debentures	139,914	134,051
Total financial liabilities	1,788,967	2,055,293
Estimated Fair Value | Level 1
Financial Assets
Cash and cash equivalents	330,961	203,790
Debt securities, held-to-maturity	0	0
Loans receivable, net of ALLL	0	0
Total financial assets	330,961	203,790
Financial Liabilities
Term deposits	0	0
FHLB advances	0	0
Repurchase agreements and other borrowed funds	0	0
Subordinated debentures	0	0
Total financial liabilities	0	0
Estimated Fair Value | Level 2
Financial Assets
Cash and cash equivalents	0	0
Debt securities, held-to-maturity	234,396	288,256
Loans receivable, net of ALLL	0	0
Total financial assets	234,396	288,256
Financial Liabilities
Term deposits	1,017,505	1,069,777
FHLB advances	38,787	439,615
Repurchase agreements and other borrowed funds	598,644	410,859
Subordinated debentures	124,094	120,302
Total financial liabilities	1,779,030	2,040,553
Estimated Fair Value | Level 3
Financial Assets
Cash and cash equivalents	0	0
Debt securities, held-to-maturity	0	0
Loans receivable, net of ALLL	9,438,121	8,079,112
Total financial assets	9,438,121	8,079,112
Financial Liabilities
Term deposits	0	0
FHLB advances	0	0
Repurchase agreements and other borrowed funds	0	0
Subordinated debentures	0	0
Total financial liabilities	$ 0	$ 0

Fair Value Measurements (Detail

Fair Value Measurements (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair value measurement transfers from one level to another	$ 0	$ 0	$ 0
Loans Held For Sale | Gain (Loss) on Sale of Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Changes in Fair Value, Gain (Loss)	$ 661,000	$ (155,000)	$ 994,000

Contingencies and Commitments_2

Contingencies and Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Outstanding Commitments
Outstanding commitments	$ 2,482,673	$ 1,993,779
Unused Lines of Credit
Outstanding Commitments
Outstanding commitments	2,422,828	1,948,516
Letters of Credit
Outstanding Commitments
Outstanding commitments	$ 59,845	$ 45,263

Consideration Transferred, Iden

Consideration Transferred, Identifiable Net Assets Acquired and Goodwill Recognized (Details) - USD ($)		Jul. 31, 2019	Apr. 30, 2019	Feb. 28, 2018	Jan. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair value of consideration transferred
Effective settlement of pre-existing receivable						$ 0	$ 10,054,000	$ 0
Liabilities assumed
Goodwill recognized						$ 166,832,000	$ 111,775,000	$ 30,758,000
Heritage Bank
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs		$ 229,385,000
Cash consideration for outstanding shares		16,420,000
Effective settlement of pre-existing receivable		0
Total fair value of consideration transferred		245,805,000
Identifiable assets acquired
Cash and cash equivalents		84,446,000
Debt securities		103,231,000
Loans receivable		615,279,000
Core deposit intangible	[1]	13,566,000
Accrued income and other assets		35,891,000
Total identifiable assets acquired		852,413,000
Liabilities assumed
Deposits		722,220,000
Borrowings		0
Accrued expenses and other liabilities		9,919,000
Total liabilities assumed		732,139,000
Total identifiable net assets		120,274,000
Goodwill recognized		$ 125,531,000
Core Deposit Intangible, Weighted Average Useful Life		10 years
First Community Bank Utah
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs			$ 87,153,000
Cash consideration for outstanding shares			4,000
Effective settlement of pre-existing receivable			0
Total fair value of consideration transferred			87,157,000
Identifiable assets acquired
Cash and cash equivalents			11,311,000
Debt securities			47,247,000
Loans receivable			245,485,000
Core deposit intangible	[1]		8,963,000
Accrued income and other assets			24,848,000
Total identifiable assets acquired			337,854,000
Liabilities assumed
Deposits			274,646,000
Borrowings			7,273,000
Accrued expenses and other liabilities			10,079,000
Total liabilities assumed			291,998,000
Total identifiable net assets			45,856,000
Goodwill recognized			$ 41,301,000
Core Deposit Intangible, Weighted Average Useful Life			10 years
First Security Bank
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs				$ 181,043,000
Cash consideration for outstanding shares				0
Effective settlement of pre-existing receivable				0
Total fair value of consideration transferred				181,043,000
Identifiable assets acquired
Cash and cash equivalents				24,397,000
Debt securities				271,865,000
Loans receivable				627,767,000
Core deposit intangible	[1]			31,053,000
Accrued income and other assets				78,274,000
Total identifiable assets acquired				1,033,356,000
Liabilities assumed
Deposits				877,586,000
Borrowings	[2]			36,880,000
Accrued expenses and other liabilities				14,175,000
Total liabilities assumed				928,641,000
Total identifiable net assets				104,715,000
Goodwill recognized				$ 76,328,000
Core Deposit Intangible, Weighted Average Useful Life				10 years
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures				$ 5,864,000
Collegiate Peaks Bank
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs					$ 69,764,000
Cash consideration for outstanding shares					16,265,000
Effective settlement of pre-existing receivable					10,054,000
Total fair value of consideration transferred					96,083,000
Identifiable assets acquired
Cash and cash equivalents					93,136,000
Debt securities					42,177,000
Loans receivable					354,252,000
Core deposit intangible	[1]				10,275,000
Accrued income and other assets					15,911,000
Total identifiable assets acquired					515,751,000
Liabilities assumed
Deposits					437,171,000
Borrowings					12,509,000
Accrued expenses and other liabilities					5,435,000
Total liabilities assumed					455,115,000
Total identifiable net assets					60,636,000
Goodwill recognized					$ 35,447,000
Core Deposit Intangible, Weighted Average Useful Life					10 years
[1]	The core deposit intangible for each acquisition was determined to have an estimated life of 10 years.
[2]	Borrowings assumed with the FSB acquisition included Tier 2 subordinated debentures of $5,864,000.

Pro Forma Summary (Details)

Pro Forma Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
2019 acquisitions
Pro Forma Information
Net interest income and non-interest income	$ 662,937	$ 608,787
Net income	$ 216,045	209,004
2018 acquisitions
Pro Forma Information
Net interest income and non-interest income		560,979	$ 520,634
Net income		$ 177,267	$ 138,042

Mergers and Acquisitions (Detai

Mergers and Acquisitions (Details Textual) - USD ($)	Jul. 31, 2019	Apr. 30, 2019	Feb. 28, 2018	Jan. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition
Effective settlement of pre-existing receivable					$ 0	$ 10,054,000	$ 0
Heritage Bank
Business Acquisition
Percentage of Outstanding Common Stock Acquired	100.00%
Fair value of consideration transferred	$ 245,805,000
Number of Shares Issued for Aquisition	5,473,276
Cash consideration for outstanding shares	$ 16,420,000
Effective settlement of pre-existing receivable	0
Loans receivable	615,279,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due	$ 617,214,000
Third-party Acquisition Related Costs					3,032,000
Net interest income and non-interest income					15,506,000
Net income					2,286,000
First Community Bank Utah
Business Acquisition
Percentage of Outstanding Common Stock Acquired		100.00%
Fair value of consideration transferred		$ 87,157,000
Number of Shares Issued for Aquisition		2,046,341
Cash consideration for outstanding shares		$ 4,000
Effective settlement of pre-existing receivable		0
Loans receivable		245,485,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due		$ 248,226,000
Third-party Acquisition Related Costs					4,979,000
Net interest income and non-interest income					12,607,000
Net income					$ 249,000
First Security Bank
Business Acquisition
Percentage of Outstanding Common Stock Acquired			100.00%
Fair value of consideration transferred			$ 181,043,000
Number of Shares Issued for Aquisition			4,654,091
Cash consideration for outstanding shares			$ 0
Effective settlement of pre-existing receivable			0
Loans receivable			627,767,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due			$ 632,370,000
Third-party Acquisition Related Costs						4,714,000
Net interest income and non-interest income						42,796,000
Net income						11,303,000
Collegiate Peaks Bank
Business Acquisition
Percentage of Outstanding Common Stock Acquired				100.00%
Fair value of consideration transferred				$ 96,083,000
Number of Shares Issued for Aquisition				1,778,777
Cash consideration for outstanding shares				$ 16,265,000
Effective settlement of pre-existing receivable				10,054,000
Loans receivable				354,252,000
Loans Receivable Acquired, Gross Principal and Contractual Interest Due				$ 355,364,000
Third-party Acquisition Related Costs						1,683,000
Net interest income and non-interest income						23,921,000
Net income						$ 4,962,000