Glacier Bancorp (GBCI) 10-K 23 Feb 22 2021 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2021	Jan. 31, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
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	NYSE
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 5,284,860,234
Entity Common Stock, Shares Outstanding		110,689,189
Documents Incorporated by Reference	Portions of the 2022 Annual Meeting Proxy Statement dated on or about March 15, 2022 are incorporated by reference into Parts I and III of this Form 10-K.
Entity Central Index Key	0000868671
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2021
Audit Information [Abstract]
Auditor Name	BKD, LLP
Auditor Location	Denver, Colorado
Auditor Firm ID	686

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash on hand and in banks	$ 198,087	$ 227,108
Interest bearing cash deposits	239,599	406,034
Cash and cash equivalents	437,686	633,142
Debt securities, available-for-sale	9,170,849	5,337,814
Debt securities, held-to-maturity	1,199,164	189,836
Total debt securities	10,370,013	5,527,650
Loans held for sale, at fair value	60,797	166,572
Loans receivable	13,432,031	11,122,696
Allowance for credit losses	(172,665)	(158,243)
Loans receivable, net	13,259,366	10,964,453
Premises and equipment, net	372,597	325,335
Other real estate owned and foreclosed assets	18	1,744
Accrued interest receivable	76,673	75,497
Deferred tax asset	27,693	0
Core deposit intangible, net	52,259	55,509
Goodwill	985,393	514,013
Non-marketable equity securities	10,020	10,023
Bank-owned life insurance	167,671	123,763
Other assets	120,459	106,505
Total assets	25,940,645	18,504,206
Liabilities
Non-interest bearing deposits	7,779,288	5,454,539
Interest bearing deposits	13,557,961	9,342,990
Securities sold under agreements to repurchase	1,020,794	1,004,583
Other borrowed funds	44,094	33,068
Subordinated debentures	132,620	139,959
Accrued interest payable	2,409	3,305
Deferred tax liability	0	23,860
Other liabilities	225,857	194,861
Total liabilities	22,763,023	16,197,165
Commitments and Contingent Liabilities	0	0
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	1,107	954
Paid-in capital	2,338,814	1,495,053
Retained earnings - substantially restricted	810,342	667,944
Accumulated other comprehensive income	27,359	143,090
Total stockholders’ equity	3,177,622	2,307,041
Total liabilities and stockholders’ equity	$ 25,940,645	$ 18,504,206
Number of common stock shares issued and outstanding (in shares)	110,687,533	95,426,364

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Preferred shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares authorized (in shares)	1,000,000	1,000,000
Preferred shares issued (in shares)	0	0
Preferred shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares authorized (in shares)	117,187,500	117,187,500

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest Income
Investment securities	$ 122,099	$ 99,616	$ 85,504
Residential real estate loans	43,300	46,392	46,899
Commercial loans	471,061	436,497	369,107
Consumer and other loans	44,614	44,559	44,667
Total interest income	681,074	627,064	546,177
Interest Expense
Deposits	12,135	17,620	23,280
Securities sold under agreements to repurchase	2,303	3,601	3,694
Federal Home Loan Bank advances	0	733	9,023
Other borrowed funds	713	646	215
Subordinated debentures	3,407	4,715	6,561
Total interest expense	18,558	27,315	42,773
Net Interest Income	662,516	599,749	503,404
Provision for credit losses	23,076	39,765	57
Net interest income after provision for credit losses	639,440	559,984	503,347
Non-Interest Income
Service charges and other fees	59,317	52,503	67,934
Miscellaneous loan fees and charges	12,038	7,344	5,313
Gain on sale of loans	63,063	99,450	34,064
(Loss) gain on sale of debt securities	(638)	1,139	14,415
Other income	11,040	12,431	9,048
Total non-interest income	144,820	172,867	130,774
Non-Interest Expense
Compensation and employee benefits	270,644	253,047	222,753
Occupancy and equipment	39,394	37,673	34,497
Advertising and promotions	11,949	10,201	10,621
Data processing	23,470	21,132	17,392
Other real estate owned and foreclosed assets	236	923	1,105
Regulatory assessments and insurance	8,249	4,656	3,771
Loss on termination of hedging activities	0	0	13,528
Aggregate amortization expense	10,271	10,370	8,485
Other expenses	70,609	66,809	62,775
Total non-interest expense	434,822	404,811	374,927
Income Before Income Taxes	349,438	328,040	259,194
Federal and state income tax expense	64,681	61,640	48,650
Net Income	$ 284,757	$ 266,400	$ 210,544
Basic earnings per share (in dollars per share)	$ 2.87	$ 2.81	$ 2.39
Diluted earnings per share (in dollars per share)	2.86	2.81	2.38
Dividends declared per share (in dollars per share)	$ 1.37	$ 1.33	$ 1.31
Average outstanding shares - basic (in shares)	99,313,255	94,883,864	88,255,290
Average outstanding shares - diluted (in shares)	99,398,250	94,932,353	88,385,775

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 284,757	$ 266,400	$ 210,544
Available-For-Sale and Transferred Securities:
Unrealized (losses) gains on available-for-sale securities	(151,426)	139,208	77,158
Reclassification adjustment for losses included in net income	(790)	(1,138)	(14,423)
Reclassification adjustment for securities transferred from available-for-sale to held-to-maturity	(3,551)	0	0
Tax effect	39,362	(34,853)	(15,896)
Net of tax amount	(116,405)	103,217	46,839
Cash Flow Hedge:
Unrealized gains (losses) on derivatives used for cash flow hedges	901	(472)	(7,047)
Reclassification adjustment for gains (losses) included in net income	0	0	10,816
Tax effect	(227)	119	(955)
Net of tax amount	674	(353)	2,814
Total other comprehensive (loss) income, net of tax	(115,731)	102,864	49,653
Total Comprehensive Income	$ 169,026	$ 369,264	$ 260,197

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Paid-in Capital	Retained Earnings Substantially Restricted	Retained Earnings Substantially RestrictedCumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comp-rehensive Income (Loss)
Balance (in shares) at Dec. 31, 2018			84,521,692
Balance at Dec. 31, 2018	$ 1,515,854	$ (25,114)	$ 845	$ 1,051,253	$ 473,183	$ (25,114)	$ (9,427)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	210,544				210,544
Other comprehensive (loss) income	49,653				0		49,653
Cash dividends declared	(117,563)				(117,563)
Stock issued in connection with acquisitions (in shares)			7,519,617
Stock issued in connection with acquisitions	316,538		$ 75	316,463
Stock issuances under stock incentive plans (in shares)			248,441
Stock issuances under stock incentive plans	0		$ 3	(3)
Stock-based compensation and related taxes	10,821			10,821
Balance (in shares) at Dec. 31, 2019			92,289,750
Balance at Dec. 31, 2019	1,960,733	$ (12,347)	$ 923	1,378,534	541,050	$ (12,347)	40,226
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	266,400				266,400
Other comprehensive (loss) income	102,864						102,864
Cash dividends declared	(127,159)				(127,159)
Stock issued in connection with acquisitions (in shares)			3,007,044
Stock issued in connection with acquisitions	112,133		$ 30	112,103
Stock issuances under stock incentive plans (in shares)			129,570
Stock issuances under stock incentive plans	0		$ 1	(1)
Stock-based compensation and related taxes	$ 4,417			4,417
Balance (in shares) at Dec. 31, 2020	95,426,364		95,426,364
Balance at Dec. 31, 2020	$ 2,307,041		$ 954	1,495,053	667,944		143,090
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	284,757				284,757
Other comprehensive (loss) income	(115,731)						(115,731)
Cash dividends declared	(142,359)				(142,359)
Stock issued in connection with acquisitions (in shares)			15,173,482
Stock issued in connection with acquisitions	839,853		$ 152	839,701
Stock issuances under stock incentive plans (in shares)			87,687
Stock issuances under stock incentive plans	0		$ 1	(1)
Stock-based compensation and related taxes	$ 4,061			4,061
Balance (in shares) at Dec. 31, 2021	110,687,533		110,687,533
Balance at Dec. 31, 2021	$ 3,177,622		$ 1,107	$ 2,338,814	$ 810,342		$ 27,359

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per share (in dollars per share)	$ 1.37	$ 1.33	$ 1.31

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income	$ 284,757	$ 266,400	$ 210,544
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	23,076	39,765	57
Net amortization of debt securities	47,299	16,893	12,985
Net amortization of purchase accounting adjustments and deferred loan fees and costs	(17,881)	(57,627)	(3,712)
Amortization of debt modification costs	0	0	4,630
Origination of loans held for sale	(1,550,787)	(2,070,843)	(983,988)
Proceeds from loans held for sale	1,797,566	2,093,549	985,345
Gain on sale of loans	(63,063)	(99,450)	(34,064)
Loss (gain) on sale of debt securities	638	(1,139)	(14,415)
Bank-owned life insurance income, net	(2,873)	(2,724)	(2,245)
Stock-based compensation, net of tax benefits	4,349	3,629	7,475
Depreciation and amortization of premises and equipment	21,768	20,420	18,592
(Gain) loss on sale and write-downs of other real estate owned, net	(105)	139	73
Deferred tax benefit	(9,095)	(6,863)	(356)
Amortization of core deposit intangibles	10,271	10,370	8,485
Amortization of investments in variable interest entities	13,457	11,282	9,700
Net decrease (increase) in accrued interest receivable	5,118	(17,663)	1,899
Net decrease (increase) in other assets	8,188	(20,926)	5,078
Net (decrease) increase in accrued interest payable	(1,222)	(1,507)	312
Net increase in other liabilities	588	5,840	254
Net cash provided by operating activities	572,049	189,545	226,649
Investing Activities
Sales of available-for-sale debt securities	0	0	712,113
Maturities, prepayments and calls of available-for-sale debt securities	1,453,049	758,879	711,838
Purchases of available-for-sale debt securities	(6,315,164)	(3,254,912)	(1,224,231)
Maturities, prepayments and calls of held-to-maturity debt securities	48,955	32,735	58,750
Purchases of held-to-maturity debt securities	(222,695)	0	0
Principal collected on loans	6,529,504	4,732,941	3,250,220
Loan originations	(7,000,632)	(5,864,038)	(3,623,548)
Net additions to premises and equipment	(9,436)	(11,717)	(16,398)
Proceeds from sale of other real estate owned	3,313	5,572	4,670
Proceeds from redemption of non-marketable equity securities	4,218	76,618	118,516
Purchases of non-marketable equity securities	(2)	(71,399)	(97,597)
Proceeds from bank-owned life insurance	2,112	0	0
Investments in variable interest entities	(22,640)	(12,088)	(16,348)
Net cash received from acquisitions	1,622,717	43,713	79,333
Net cash used in investing activities	(3,906,701)	(3,563,696)	(42,682)
Financing Activities
Net increase in deposits	3,266,304	3,418,199	285,856
Net increase in securities sold under agreements to repurchase	16,211	427,510	172,264
Net decrease in short-term Federal Home Loan Bank advances	0	(30,000)	(255,000)
Proceeds from long-term Federal Home Loan Bank advances	0	30,000	0
Repayments of long-term Federal Home Loan Bank advances	0	(38,589)	(151,160)
Net increase in other borrowed funds	3,526	564	14,109
Cash dividends paid	(145,557)	(131,263)	(124,468)
Tax withholding payments for stock-based compensation	(1,553)	(1,082)	(1,293)
Proceeds from stock option exercises	265	993	2,896
Net cash provided by (used in) financing activities	3,139,196	3,676,332	(56,796)
Net (decrease) increase in cash, cash equivalents and restricted cash	(195,456)	302,181	127,171
Cash, cash equivalents and restricted cash at beginning of period	633,142	330,961	203,790
Cash, cash equivalents and restricted cash at end of period	437,686	633,142	330,961
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	19,779	28,822	42,461
Cash paid during the period for income taxes	67,306	63,021	36,817
Supplemental Disclosure of Non-Cash Investing Activities
Transfer of debt securities from held-to-maturity to available-for-sale	844,020	0	0
Sale and refinancing of other real estate owned	0	215	7
Transfer of loans to other real estate owned	1,482	2,076	2,349
Right-of-use assets obtained in exchange for operating lease liabilities	801	7,406	9,948
Dividends declared during the period but not paid	11,352	14,572	18,686
Acquisitions
Fair value of common stock shares issued	839,853	112,133	316,538
Cash consideration	9	13,721	16,424
Fair value of assets acquired	4,131,662	745,420	1,357,099
Liabilities assumed	$ 3,291,800	$ 619,566	$ 1,024,137

Nature of Operations and Summar

Nature of Operations and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
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 and loan servicing. 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 credit losses (“ACL” or “allowance”) on loans; 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 ACL on loans and real estate valuation estimates, management obtains independent appraisals (new or updated) for significant items. Estimates relating to the investment valuations are obtained from independent third parties. Estimates relating to the evaluation of goodwill for impairment are determined based on internal calculations using independent party inputs. Principles of Consolidation The consolidated financial statements of the Company include the parent holding company and the Bank, which consists of seventeen bank divisions and a corporate division. The corporate division includes the Bank’s investment portfolio, wholesale borrowings and other centralized functions. 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. 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. On October 1, 2021, the Company completed the acquisition of Altabancorp, the bank holding company for Altabank, a community bank based in American Fork, Utah (collectively, “Alta”). In February 2020, the Company completed the acquisition of State Bank Corp., the bank holding company for State Bank of Arizona, a community bank based in Lake Havasu City, Arizona (collectively, “SBAZ”). 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”). 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 23. 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. During 2020, the FRB temporarily reduced the reserve requirement due to the coronavirus disease of 2019 (“COVID-19”). The required reserve balance at December 31, 2021 was $0. Debt Securities On January 1, 2020, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-13, Financial Instruments - Credit Losses , which significantly changed the allowance for credit loss accounting policies for debt securities. The following debt securities and allowance for credit loss accounting policies are presented under Accounting Standards Codification™ (“ASC”) Topic 326. 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. When the Company acquires another entity, it records the debt securities at fair value. The Company reviews and analyzes the various risks that may be present within the investment portfolio on an ongoing basis, including market risk, credit risk and liquidity 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. The credit rating of a security is considered the primary credit quality indicator for debt securities. Liquidity risk refers to the risk that a security will not have an active and efficient market in which the security can be sold. A debt security is investment grade if the issuer has 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. The Company has acquired debt securities through acquisitions and if the securities have more than insignificant credit deterioration since origination, they are designated as purchased credit-deteriorated (“PCD”) securities. An ACL is determined using the same methodology as with other debt securities. The sum of a PCD security’s fair value and associated ACL becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the debt security is a noncredit discount or premium, which is amortized into interest income over the life of the security. Subsequent changes to the ACL are recorded through provision for credit losses. For additional information relating to debt securities, see Note 2. Allowance for Credit Losses - Available-for-Sale Debt Securities For available-for-sale debt securities in an unrealized loss position, the Company first assesses whether it intends to sell, or it is more-likely-than-not that it will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through other expense. For the available-for-sale securities that do not meet the aforementioned criteria, the Company evaluates whether the decline in fair value has resulted from cred it losses or other factors. In such assessment, the Company considers the extent to which fair value is less than amortized cost, if there are any changes to the investment grade of the security by a rating agency, and if there are any adverse conditions that impact the security. If this assessment indicates a credit loss exists, the present value of the cash flows expected to be collected from the security is compared to the amortized cost basis of the s ecurity. If the present value of the cash flows expected to be collected is less than the amortized cost basis, a potential credit loss exists and an ACL is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost. Any estimated credit losses that have not been recorded through an ACL are recognized in OCI. The Company has elected to exclude accrued interest from the estimate of credit losses for available-for-sale debt securities. As part of its non-accrual policy, the Company charges-off uncollectable interest at the time it is determined to be uncollectable. Allowance for Credit Losses - Held-to-Maturity Debt Securities For estimating the allowance for held-to-maturity (“HTM”) debt securities that share similar risk characteristics with other securities, such securities are pooled based on major security type. For pools of such securities with similar risk characteristics, the historical lifetime probability of default and severity of loss in the event of default is derived or obtained from external sources and adjusted for the expected effects of reasonable and supportable forecasts over the expected lives of the securities on those historical credit losses. Expected credit losses on securities in the held-to-maturity portfolio that do not share similar risk characteristics with any of the pools of debt securities are individually measured based on net realizable value, or the difference between the discounted value of the expected future cash flows, based on the original effective interest rate, and the recorded amortized cost basis of the securities. The Company has elected to exclude accrued interest from the estimate of credit losses for held-to-maturity debt securities. As part of its non-accrual policy, the Company charges off uncollectable interest at the time it is determined to be uncollectable. 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 and may or may not be sold with servicing rights released. Changes in fair value are recognized in non-interest income. Fair value elections are made at the time of origination based on the Company’s fair value election policy. Loans Receivable On January 1, 2020, the Company adopted FASB ASU 2016-13, Financial Instruments - Credit Losses , which significantly changed the loan and allowance for credit loss accounting policies. The following loan and allowance for credit loss accounting policies are presented under ASC Topic 326, whereas prior periods are presented in accordance with the incurred loss model as disclosed in the Company’s 2019 Annual Report on Form 10-K. The Company’s loan segments or classes are based on the purpose of the loan and consist of residential real estate, commercial real estate, other commercial, home equity, and other consumer loans. Loans that are intended at origination to be held-to-maturity, are reported at the unpaid principal balance less net c harge-offs and adjusted for deferred fees and costs on originated loans and unamortized premiums or discounts on acquired loans. Interest income is accrued on the unpaid principal balance. 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 or straight-line methods. The interest method is utilized for loans with scheduled payment terms and the objective is to calculate periodic interest income at a constant effective yield. The straight-line method is utilized for revolving lines of credit or loans with no scheduled payment terms. When a loan is paid off prior to maturity, the remaining unamortized fees and costs on originated loans and unamortized premiums or discounts on acquired loans are immediately recognized as interest income. 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 has acquired loans through acquisitions, some of which have experienced more than insignificant credit deterioration since origination. The Company considers all acquired non-accrual loans to be PCD loans. In addition, the Company considers loans accruing ninety days or more past due or substandard loans to be PCD loans. An ACL is determined using the same methodology as other loans held for investment. The ACL determined on a collective basis is allocated to individual loans. The sum of a loan’s fair value and ACL becomes the initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. Subsequent changes to the ACL are recorded through provision for credit losses. For additional information relating to loans, see Note 3. Allowance for Credit Losses - Loans Receivable The allowance for credit losses for loans receivable represents management’s estimate of credit losses over the expected contractual life of the loan portfolio. The estimate is determined based on the amortized cost of the loan portfolio including the loan balance adjusted for charge-offs, recoveries, deferred fees and costs, and loan discount and premiums. Recoveries are included only to the extent that such amounts were previously charged-off. The Company has elected to exclude accrued interest from the estimate of credit losses for loans. Determining the adequacy of the allowance is complex and requires a high degree of judgment by management about the effect of matters that are inherently uncertain. Subsequent evaluations of the then-existing loan portfolio, in light of the factors then prevailing, may result in significant changes in the allowance in those future periods. The allowance is increased for estimated credit losses which are recorded as expense. The portion of loans and overdraft balances determined by management to be uncollectable are charged-off as a reduction to the allowance and recoveries of amounts previously charged-off increase the allowance. 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. The expected credit loss estimate process involves procedures to consider the unique characteristics of each of the Company’s loan portfolio segments, which consist of residential real estate, commercial real estate, other commercial, home equity, and other consumer loans. When computing the allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, credit and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. The Company has determined a four consecutive quarter forecasting period is a reasonable and supportable period. Expected credit loss for periods beyond reasonable and supportable forecast periods are determined based on a reversion method which reverts back to historical loss estimate over a four consecutive quarter period on a straight-line basis. Credit quality is assessed and monitored by evaluating various attributes and the results of those evaluations are utilized in underwriting new loans and the process for estimating the expected credit losses. The following paragraphs describe the risk characteristics relevant to each portfolio segment. 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 residential property securing the loans and affect the borrowers' personal incomes. Mitigating risk factors for this loan segment 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 segment 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 allowance is impacted by loan volumes, delinquency status, credit ratings, historical loss experiences, estimated prepayment speeds, weighted average lives and other conditions influencing loss expectations, such as reasonable and supportable forecasts of economic conditions. The methodology for estimating the amount of expected credit losses reported in the allowance has two basic components: 1) individual loans that do not share similar risk characteristics with other loans and the measurement of expected credit losses for such individual loans; and 2) the expected credit losses for pools of loans that share similar risk characteristics. Loans that do not Share Similar Risk Characteristics with Other Loans. For a loan that does not share similar risk characteristics with other loans, expected credit loss is measured based on the net realizable value, that is, the difference between the discounted value of the expected future cash flows, based on the original effective interest rate, and the amortized cost basis of the loan. For these loans, the expected credit loss is equal to the amount by which the net realizable value of the loan is less than the amortized cost basis of the loan (which is net of previous charge-offs and deferred loan fees and costs), except when the loan is collateral-dependent, that is, when foreclosure is probable or the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. In these cases, expected credit loss is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral. The fair value of the collateral is adjusted for the estimated cost to sell if repayment or satisfaction of a loan is dependent on the sale (rather than only on the operation) of the collateral. The Company has determined that non-accrual loans do not share similar risk characteristics with other loans and these loans are individually evaluated for estimated allowance for credit losses. The Company, through its credit monitoring process, may also identify other loans that do not share similar risk characteristics and individually evaluate such loans. The starting point for determining the fair value of collateral is to obtain external appraisals or evaluations (new or updated). 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 Company’s credit department reviews appraisals, giving consideration to the highest and best use of the collateral. 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. Adjustments may be made to the fair value of the collateral after review and acceptance of the collateral appraisal or evaluation (new or updated). Loans that Share Similar Risk Characteristics with other Loans. For estimating the allowance for loans that share similar risk characteristics with other loans, such loans are segregated into loan segments. Loans are designated into loan segments based on loans pooled by product types and similar risk characteristics or areas of risk concentration. In determining the ACL, the Company derives an estimated credit loss assumption from a model that categorizes loan pools based on loan type which is further segregated by the credit quality indicators. This model calculates an expected loss percentage for each loan segment by considering the non-discounted simple annual average historical loss rate of each loan segment (calculated through an “open pool” method), multiplying the loss rate by the amortized loan balance and incorporating that segment’s internally generated prepayment speed assumption and contractually scheduled remaining principal pay downs on a loan level basis. The annual historical loss rates are adjusted over a reasonable economic forecast period by a multiplier that is calculated based upon current national economic forecasts as a proportion of each segment’s historical average loss levels. The Company will then revert from the economic forecast period back to the historical average loss rate in a straight-line basis. After the reversion period, the loans will be assumed to experience their historical loss rate for the remainder of their contractual lives. The model applies the expected loss rate over the projected cash flows at the individual loan level and then aggregates the losses by loan segment in determining their quantitative allowance. The Company will also include qualitative adjustments to adjust the ACL on loan segments to the extent the current or future market conditions are believed to vary substantially from historical conditions in regards to: • lending policies and procedures; • i nternational, national, regional and local economic business conditions, developments, or environmental conditions that affect the collectability of the portfolio, including the condition of various markets; • the nature and volume of the loan portfolio including the terms of the loans; • the experience, ability, and depth of the lending management and other relevant staff; • the volume and severity of past due and adversely classified or graded loans and the volume of non-accrual loans; • the quality of our loan review system; • the value of underlying collateral for collateralized loans; • the existence and effect of any concentrations of credit, and changes in the level of concentrations; and • the effect of external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the existing portfolio. The Company regularly reviews loans in the portfolio to assess credit quality indicators and to determine the appropriate loan classification and grading in accordance with applicable bank regulations. The primary credit quality indicator for residential, home equity and other consumer loans is the days past due status, which consists of the following categories: 1) performing loans; 2) 30 to 89 days past due loans; and 3) non-accrual and ninety days or more past due loans. The primary credit quality indicator for commercial real estate and commercial loans is the Company’s internal risk rating system, which includes the following categories: 1) pass loans; 2) special mention loans; 3) substandard loans; and 4) doubtful or loss loans. Such credit quality indicators are regularly monitored and incorporated into the Company’s allowance estimate. The following paragraphs further define the internal risk ratings for commercial real estate and commercial loans. Pass Loans. These ratings represent loans that are of acceptable, good or excellent quality with very limited to no risk. Loans that do not have one of the following ratings are considered pass loans. Special Mention Loans. These ratings represent loans that are designated as special mention per the regulatory definition. Special mention loans are currently protected but are potentially weak. The credit risk may be relatively minor yet constitute an undue and unwarranted risk in light of the circumstances surrounding a specific loan. The rating may be used to identify credit with potential weaknesses that if not corrected may weaken the loan to the point of inadequately protecting the Bank’s credit position. Examples include a lack of supervision, inadequate loan agreement, condition, or control of collateral, incomplete, or improper documentation, deviations from lending policy, and adverse trends in operations or economic conditions. Substandard Loans. This rating represents loans that are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged. A loan so classified must have a well-defined weakness that jeopardizes the liquidation of the debt. These loans are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected. Loss potential, while existing in the aggregated amount of substandard loans, does not have to exist in an individual loan classified substandard. Doubtful/Loss Loans. A loan classified as doubtful has the characteristics that make collection in full, on the basis of currently existing facts, conditions, and values, highly improbable. The possibility of loss is extremely high, but because of pending factors, which may work to the advantage and strengthening of the loan, its classification as loss is deferred until its more exact status may be determined. Pending factors include proposed merger, acquisition, or liquidation procedures, capital injection, perfecting liens on additional collateral and refinancing plans. Loans are classified as loss when they are deemed to be not collectible and of such little value that continuance as an active asset of the Bank is not warranted. Loans classified as loss must be charged-off. Assignment of this classification does not mean that an asset has absolutely no recovery or salvage value, but that it is not practical or desirable to defer writing off a basically worthless asset, even though partial recovery may be attained in the future. Restructured Loans 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. 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;

Debt Securities

Debt Securities	12 Months Ended
	Dec. 31, 2021
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, 2021 Amortized Gross Unrealized Gains Gross Unrealized Losses Fair (Dollars in thousands) Available-for-sale U.S. government and federal agency $ 1,356,171 174 (9,596) 1,346,749 U.S. government sponsored enterprises 241,687 2 (996) 240,693 State and local governments 461,414 27,567 (123) 488,858 Corporate bonds 175,697 5,072 (17) 180,752 Residential mortgage-backed securities 5,744,505 9,420 (54,266) 5,699,659 Commercial mortgage-backed securities 1,195,949 25,882 (7,693) 1,214,138 Total available-for-sale 9,175,423 68,117 (72,691) 9,170,849 Held-to-maturity State and local governments 1,199,164 22,878 (1,159) 1,220,883 Total held-to-maturity 1,199,164 22,878 (1,159) 1,220,883 Total debt securities $ 10,374,587 90,995 (73,850) 10,391,732 December 31, 2020 Amortized Gross Unrealized Gains Gross Unrealized Losses Fair (Dollars in thousands) Available-for-sale U.S. government and federal agency $ 38,568 287 (267) 38,588 U.S. government sponsored enterprises 9,747 34 — 9,781 State and local governments 1,321,763 94,974 (54) 1,416,683 Corporate bonds 336,867 12,239 (8) 349,098 Residential mortgage-backed securities 2,261,463 27,631 (4) 2,289,090 Commercial mortgage-backed securities 1,177,458 57,575 (459) 1,234,574 Total available-for-sale 5,145,866 192,740 (792) 5,337,814 Held-to-maturity State and local governments 189,836 13,380 — 203,216 Total held-to-maturity 189,836 13,380 — 203,216 Total debt securities $ 5,335,702 206,120 (792) 5,541,030 Maturity Analysis 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, 2021. Actual maturities may differ from expected or contractual maturities since some issuers have the right to prepay obligations with or without prepayment penalties. December 31, 2021 Available-for-Sale Held-to-Maturity (Dollars in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 54,460 54,824 1,432 1,445 Due after one year through five years 1,143,487 1,146,529 29,286 30,932 Due after five years through ten years 815,328 816,598 91,688 96,253 Due after ten years 221,694 239,101 1,076,758 1,092,253 2,234,969 2,257,052 1,199,164 1,220,883 Mortgage-backed securities 1 6,940,454 6,913,797 — — Total $ 9,175,423 9,170,849 1,199,164 1,220,883 ______________________________ 1 Mortgage-backed securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Sales and Calls of Debt Securities 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 $ 188,431 240,521 928,710 Gross realized gains 1 984 1,400 18,936 Gross realized losses 1 (194) (262) (4,513) Held-to-maturity Proceeds from calls of debt securities 48,475 32,735 58,750 Gross realized gains 1 3 1 2 Gross realized losses 1 (1,431) — (10) ______________________________ 1 The gain or loss on the sale or call of each debt security is determined by the specific identification method. At December 31, 2021 and 2020, the Company had debt securities with carrying values of $2,687,652,000 and $2,169,967,000, respectively, pledged as collateral to FHLB, FRB, securities sold under agreements to repurchase (“repurchase agreements”), and for deposits of several state and local government units. Allowance for Credit Losses - Available-For-Sale Debt Securities In assessing whether a credit loss existed on available-for-sale debt securities with unrealized losses, the Company compared the present value of cash flows expected to be collected from the debt securities with the amortized cost basis of the debt securities. In addition, the following factors were evaluated individually and collectively in determining the existence of expected credit losses: • credit ratings from Nationally Recognized Statistical Rating Organizations (“NRSRO” entities such as Standard and Poor’s [“S&P”] and Moody’s); • extent to which the fair value is less than cost; • adverse conditions, if any, specifically related to the impaired securities, including the industry and geographic area; • the overall deal and payment structure of the debt securities, including the investor entity’s position within the structure, underlying obligors, financial condition and near-term prospects of the issuer, including specific events which may affect the issuer’s operations or future earnings, and credit support or enhancements; and • failure of the issuer and underlying obligors, if any, to make scheduled payments of interest and principal. The following table summarizes available-for-sale debt securities that were in an unrealized loss position for which an ACL has not been recorded, based on the length of time the individual securities have been in an unrealized loss position. The number of available-for-sale debt securities in an unrealized position is also disclosed. December 31, 2021 Number 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 50 $ 1,329,399 (9,344) 5,457 (252) 1,334,856 (9,596) U.S. government sponsored enterprises 11 239,928 (996) — — 239,928 (996) State and local governments 10 11,080 (83) 1,760 (40) 12,840 (123) Corporate bonds 3 12,483 (17) — — 12,483 (17) Residential mortgage-backed securities 151 5,335,632 (53,434) 53,045 (832) 5,388,677 (54,266) Commercial mortgage-backed securities 38 302,784 (3,316) 126,798 (4,377) 429,582 (7,693) Total available-for-sale 263 $ 7,231,306 (67,190) 187,060 (5,501) 7,418,366 (72,691) December 31, 2020 Number 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 18 $ 13,814 (258) 726 (9) 14,540 (267) State and local governments 6 3,121 (54) — — 3,121 (54) Corporate bonds 3 5,500 (8) — — 5,500 (8) Residential mortgage-backed securities 14 2,354 (4) 27 — 2,381 (4) Commercial mortgage-backed securities 5 120,741 (459) — — 120,741 (459) Total available-for-sale 46 $ 145,530 (783) 753 (9) 146,283 (792) With respect to severity, the majority of available-for-sale debt securities with unrealized loss positions at December 31, 2021 have unrealized losses as a percentage of book value of less than five percent. A substantial portion of such securities were issued by Federal National Mortgage Association (“Fannie Mae”), Federal Home Loan Mortgage Corporation (“Freddie Mac”), Government National Mortgage Association (“Ginnie Mae”) and other agencies of the U.S. government or have credit ratings issued by one or more of the NRSRO entities in the four highest credit rating categories. All of the Company’s available-for-sale debt securities with unrealized loss positions at December 31, 2021 have been determined to be investment grade. The Company did not have any past due available-for-sale debt securities as of December 31, 2021 and December 31, 2020, respectively. Accrued interest receivable on available-for-sale debt securities totaled $18,788,000 and $20,215,000 at December 31, 2021 and December 31, 2020, respectively, and was excluded from the estimate of credit losses. During the period ended December 31, 2021, the Company acquired available-for-sale debt securities from the secondary market and through the Altabank acquisition. Such securities were evaluated and it was determined there were no PCD securities, so no allowance for credit losses was recorded. Based on an analysis of its available-for-sale debt securities with unrealized losses as of December 31, 2021, the Company determined the decline in value was unrelated to credit losses and was primarily the result of changes in interest rates and market spreads subsequent to acquisition. The fair value of the debt securities is expected to recover as payments are received and the debt securities approach maturity. In addition, as of December 31, 2021, management determined it did not intend to sell available-for-sale debt securities with unrealized losses, and there was no expected requirement to sell such securities before recovery of their amortized cost. As a result, no ACL was recorded on available-for-sale debt securities at December 31, 2021. As part of this determination, the Company considered contractual obligations, regulatory constraints, liquidity, capital, asset/liability management and securities portfolio objectives and whether or not any of the Company’s investment securities were managed by third-party investment funds. Allowance for Credit Losses - Held-To-Maturity Debt Securities The Company measured expected credit losses on held-to-maturity debt securities on a collective basis by major security type and NRSRO credit ratings, which is the Company’s primary credit quality indicator for state and local government securities. The estimate of expected credit losses considered historical credit loss information that was adjusted for current conditions as well as reasonable and supportable forecasts. The following table summarizes the amortized cost of held-to-maturity debt securities aggregated by NRSRO credit rating: (Dollars in thousands) December 31, December 31, Held-to-maturity S&P: AAA / Moody’s: Aaa $ 316,899 39,022 S&P: AA+, AA, AA- / Moody’s: Aa1, Aa2, Aa3 841,616 123,664 S&P: A+, A, A- / Moody’s: A1, A2, A3 39,078 27,150 Not rated by either entity 1,571 — Total held-to-maturity $ 1,199,164 189,836 The Company’s held-to-maturity debt securities portfolio is primarily comprised of general obligation and revenue bonds with NRSRO ratings in the four highest credit rating categories. All of the Company’s held-to-maturity debt securities at December 31, 2021 have been determined to be investment grade. As of December 31, 2021 and December 31, 2020, the Company did not have any held-to-maturity debt securities past due. Accrued interest receivable on held-to-maturity debt securities totaled $8,737,000 and $1,728,000 at December 31, 2021 and December 31, 2020, respectively, and were excluded from the estimate of credit losses. Based on the Company’s evaluation, an insignificant amount of credit losses is expected on the held-to-maturity debt securities portfolio; therefore, no ACL was recorded at December 31, 2021 or December 31, 2020.

Loans Receivable, Net

Loans Receivable, Net	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
Loans Receivable, Net	Loans Receivable, Net The following table presents loans receivable for each portfolio segment of loans: (Dollars in thousands) December 31, December 31, Residential real estate $ 1,051,883 802,508 Commercial real estate 8,630,831 6,315,895 Other commercial 2,664,190 3,054,817 Home equity 736,288 636,405 Other consumer 348,839 313,071 Loans receivable 13,432,031 11,122,696 Allowance for credit losses (172,665) (158,243) Loans receivable, net $ 13,259,366 10,964,453 Net deferred origination (fees) costs included in loans receivable $ (21,667) (26,709) Net purchase accounting (discounts) premiums included in loans receivable $ (25,166) (17,091) Accrued interest receivable on loans $ 49,133 53,538 Substantially all of the Company’s loans receivable are with borrowers in the Company’s geographic market areas. Although the Company has a diversified loan portfolio, a substantial portion of borrowers’ ability to service their obligations is dependent upon the economic performance in the Company’s market areas. Other than purchases through bank acquisitions, the Company had no significant purchases or sales of portfolio loans or reclassification of loans held for investment to loans held for sale during 2021 and 2020. At December 31, 2021, the Company had loans of $7,948,796,000 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, 2021 and 2020. No borrower had outstanding loans or commitments exceeding 10 percent of the Company’s consolidated stockholders’ equity as of December 31, 2021. 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, 2021 and 2020 was $112,127,000 and $77,634,000, respectively. During 2021, net new loans to such related parties were $56,937,000 and repayments were $22,444,000. 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 Credit Losses - Loans Receivable The ACL is a valuation account that is deducted from the amortized cost basis to present the net amount expected to be collected on loans. The following tables summarize the activity in the ACL: Year ended December 31, 2021 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 158,243 9,604 86,999 49,133 8,182 4,325 Acquisitions 371 — 309 62 — — Provision for credit losses 16,380 6,517 28,996 (23,444) 186 4,125 Charge-offs (11,594) (38) (279) (4,826) (45) (6,406) Recoveries 9,265 375 1,876 3,778 243 2,993 Balance at end of period $ 172,665 16,458 117,901 24,703 8,566 5,037 Year ended December 31, 2020 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 124,490 10,111 69,496 36,129 4,937 3,817 Impact of adopting CECL 3,720 3,584 10,533 (13,759) 3,400 (38) Acquisitions 49 — 49 — — — Provision for credit losses 37,637 (4,131) 9,324 29,812 (27) 2,659 Charge-offs (13,808) (21) (3,497) (4,860) (384) (5,046) Recoveries 6,155 61 1,094 1,811 256 2,933 Balance at end of period $ 158,243 9,604 86,999 49,133 8,182 4,325 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 credit 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 As a result of the adoption of the current expected credit loss (“CECL”) accounting standard, the Company adjusted the January 1, 2020 ACL balances within each loan segment to reflect the changes from the incurred loss model to the current expected credit loss model which resulted in increases and decreases in each loan segment based on, among other factors, quantitative and qualitative assumptions and the economic forecast to estimate the provision for credit losses over the expected life of the loans. During the year ended December 31, 2021, the ACL increased primarily as a result of the $18,056,000 provision for credit losses recorded as a result of the Alta acquisition. During the year ended December 31, 2020, primarily as a result of the COVID-19 pandemic, there was a significant increase in the overall ACL and increases and decreases within certain loan segments. In addition, during 2020 the acquisition of SBAZ resulted in a $4,794,000 increase in the ACL due to the provision for credit losses recorded subsequent to the acquisition date. The COVID-19 pandemic significantly adjusted the economic forecast used in the ACL model including a significant increase in national and regional unemployment rates and a significant decrease in the gross domestic product (“GDP”). The sizeable charge-offs in the other consumer loan segment is driven by deposit overdraft charge-offs which typically experience high charge-off rates and the amounts were comparable to historical trends. The other segments experience routine charge-offs and recoveries, with occasional large credit relationships charge-offs and recoveries that cause fluctuations from prior periods. During the year ended December 31, 2021, there have been no significant changes to the types of collateral securing collateral-dependent loans. During the year ended December 31, 2021, the Company acquired loans through the Alta acquisition. Such loans were evaluated at acquisition date and it was determined there were PCD loans totaling $58,576,000 with an ACL of $371,000. There was also a premium associated with such loans of $840,000, which was attributable to changes in interest rates and other factors such as liquidity as of acquisition date. During the year ended December 31, 2020, the Company acquired loans through the SBAZ acquisition. Such loans were evaluated at acquisition date and it was determined there were PCD loans totaling $3,401,000 with an ACL of $49,000. There was also a discount associated with such loans of $13,000, which was attributable to changes in interest rates and other factors such as liquidity as of acquisition date. Aging Analysis The following tables present an aging analysis of the recorded investment in loans: December 31, 2021 (Dollars in thousands) Total Residential Commercial Other Home Other Accruing loans 30-59 days past due $ 38,081 2,132 26,063 5,464 1,582 2,840 Accruing loans 60-89 days past due 12,485 457 9,537 1,652 512 327 Accruing loans 90 days or more past due 17,141 223 15,345 1,383 57 133 Non-accrual loans with no ACL 28,961 2,162 20,040 4,563 1,712 484 Non-accrual loans with ACL 21,571 255 448 20,765 99 4 Total past due and non-accrual loans 118,239 5,229 71,433 33,827 3,962 3,788 Current loans receivable 13,313,792 1,046,654 8,559,398 2,630,363 732,326 345,051 Total loans receivable $ 13,432,031 1,051,883 8,630,831 2,664,190 736,288 348,839 December 31, 2020 (Dollars in thousands) Total Residential Commercial Other Home Other Accruing loans 30-59 days past due $ 17,123 6,058 3,854 4,039 2,130 1,042 Accruing loans 60-89 days past due 5,598 584 2,299 809 756 1,150 Accruing loans 90 days or more past due 1,725 934 231 293 135 132 Non-accrual loans with no ACL 29,532 3,129 14,030 9,231 2,664 478 Non-accrual loans with ACL 2,432 274 1,787 278 49 44 Total past due and non-accrual loans 56,410 10,979 22,201 14,650 5,734 2,846 Current loans receivable 11,066,286 791,529 6,293,694 3,040,167 630,671 310,225 Total loans receivable $ 11,122,696 802,508 6,315,895 3,054,817 636,405 313,071 The Company had $660,000 and $832,000 of interest reversed on non-accrual loans during the year ended December 31, 2021 and December 31, 2020, respectively. Collateral-Dependent Loans A loan is considered collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. The collateral on the loans is a significant portion of what secures the collateral-dependent loans and significant changes to the fair value of the collateral can impact the ACL. During 2021, there were no significant changes to collateral which secures the collateral-dependent loans, whether due to general deterioration or other reasons. The following table presents the amortized cost basis of collateral-dependent loans by collateral type: December 31, 2021 (Dollars in thousands) Total Residential Commercial Other Home Other Business assets $ 25,182 — 57 25,125 — — Residential real estate 4,625 2,369 280 115 1,694 167 Other real estate 32,093 48 30,996 597 116 336 Other 1,525 — — 1,241 — 284 Total $ 63,425 2,417 31,333 27,078 1,810 787 December 31, 2020 (Dollars in thousands) Total Residential Commercial Other Home Other Business assets $ 4,325 — 37 4,288 — — Residential real estate 7,148 3,338 1,043 198 2,513 56 Other real estate 16,127 64 14,738 1,086 200 39 Other 36,855 — — 36,469 — 386 Total $ 64,455 3,402 15,818 42,041 2,713 481 Restructured Loans A restructured loan is considered a 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. There were no TDRs that occurred during the year ended December 31, 2021 that subsequently defaulted. 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, 2021 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 12 1 5 3 1 2 Pre-modification recorded balance $ 2,442 210 1,473 554 54 151 Post-modification recorded balance $ 2,442 210 1,473 554 54 151 Year ended December 31, 2020 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 16 1 10 4 1 — Pre-modification recorded balance $ 14,945 210 13,392 1,304 39 — Post-modification recorded balance $ 14,945 210 13,392 1,304 39 — TDRs that subsequently defaulted Number of loans 1 — 1 — — — Recorded balance $ 145 — 145 — — — 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 — — — The modifications for the loans designated as TDRs during the years ended December 31, 2021, 2020 and 2019 included one or a combination of the following: an extension of the maturity date, a reduction of the interest rate or a reduction in the principal amount. In addition to the loans designated as TDRs during the period provided in the preceding tables, the Company had TDRs with pre-modification loan balances of $1,628,000, $2,278,000 and $2,992,000 for the years ended December 31, 2021, 2020 and 2019, respectively, for which OREO was received in full or partial satisfaction of the loans. The majority of such TDRs were in other commercial for the year ended December 31, 2021, commercial real estate for the year ended December 31, 2020, and residential real estate for the year ended December 31, 2019. At December 31, 2021 and 2020, the Company had $102,000 and $548,000, respectively, of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process. At December 31, 2021 and 2020, the Company had $0 and $273,000, respectively, of OREO secured by residential real estate properties. There were $1,054,000 and $817,000 of additional unfunded commitments on TDRs outstanding at December 31, 2021 and 2020, respectively. The amount of charge-offs on TDRs during 2021, 2020 and 2019 was $0, $453,000 and $709,000, respectively. Credit Quality Indicators The Company categorizes commercial real estate and other commercial loans into risk categories based on relevant information about the ability of borrowers to service their obligations. The following tables present the amortized cost in commercial real estate and other commercial loans based on the Company’s internal risk rating. The date of a modification, renewal or extension of a loan is considered for the year of origination if the terms of the loan are as favorable to the Company as the terms are for a comparable loan to other borrowers with similar credit risk. December 31, 2021 (Dollars in thousands) Total Pass Special Mention Substandard Doubtful/ Commercial real estate loans Term loans by origination year 2021 $ 2,679,564 2,677,540 — 2,024 — 2020 1,512,845 1,499,895 — 12,950 — 2019 952,039 919,091 — 32,948 — 2018 808,275 788,292 — 19,983 — 2017 665,733 624,018 — 41,715 — Prior 1,677,875 1,621,819 — 56,030 26 Revolving loans 334,500 332,696 — 1,803 1 Total $ 8,630,831 8,463,351 — 167,453 27 Other commercial loans 1 Term loans by origination year 2021 $ 751,151 746,709 — 4,442 — 2020 429,500 420,547 — 8,952 1 2019 235,591 226,614 — 8,974 3 2018 188,009 179,679 — 8,329 1 2017 209,287 207,509 — 1,775 3 Prior 312,852 297,926 — 14,275 651 Revolving loans 537,800 507,258 — 30,526 16 Total $ 2,664,190 2,586,242 — 77,273 675 ______________________________ 1 Includes PPP loans. December 31, 2020 (Dollars in thousands) Total Pass Special Mention Substandard Doubtful/ Commercial real estate loans Term loans by origination year 2020 $ 1,496,094 1,490,947 — 5,147 — 2019 1,077,461 1,069,503 — 7,958 — 2018 914,506 874,673 — 39,833 — 2017 723,448 696,371 — 27,077 — 2016 496,275 481,392 — 14,883 — Prior 1,488,281 1,450,596 — 37,574 111 Revolving loans 119,830 116,548 — 3,282 — Total $ 6,315,895 6,180,030 — 135,754 111 Other commercial loans 1 Term loans by origination year 2020 $ 1,366,664 1,341,316 19,564 5,784 — 2019 304,430 284,981 12,582 6,864 3 2018 241,222 234,988 — 6,233 1 2017 269,857 264,651 — 5,114 92 2016 179,225 177,164 — 2,056 5 Prior 218,306 206,431 — 11,329 546 Revolving loans 475,113 467,929 54 7,112 18 Total $ 3,054,817 2,977,460 32,200 44,492 665 ______________________________ 1 Includes PPP loans. For residential real estate, home equity and other consumer loan segments, the Company evaluates credit quality primarily on the aging status of the loan. The following tables present the amortized cost in residential real estate, home equity and other consumer loans based on payment performance: December 31, 2021 (Dollars in thousands) Total Performing 30-89 Days Past Due Non-Accrual and 90 Days or More Past Due Residential real estate loans Term loans by origination year 2021 $ 427,814 427,318 496 — 2020 179,395 178,016 1,232 147 2019 66,543 66,470 — 73 2018 51,095 50,816 — 279 2017 42,181 42,005 — 176 Prior 146,299 143,473 861 1,965 Revolving loans 138,556 138,556 — — Total $ 1,051,883 1,046,654 2,589 2,640 Home equity loans Term loans by origination year 2021 $ 871 871 — — 2020 303 303 — — 2019 1,293 1,260 — 33 2018 1,329 1,328 — 1 2017 886 886 — — Prior 11,494 10,589 576 329 Revolving loans 720,112 717,089 1,518 1,505 Total $ 736,288 732,326 2,094 1,868 Other consumer loans Term loans by origination year 2021 $ 151,407 150,910 469 28 2020 80,531 80,072 443 16 2019 37,036 36,647 187 202 2018 19,563 19,268 144 151 2017 8,591 8,506 78 7 Prior 17,763 15,968 1,589 206 Revolving loans 33,948 33,680 257 11 Total $ 348,839 345,051 3,167 621 December 31, 2020 (Dollars in thousands) Total Performing 30-89 Days Past Due Non-Accrual and 90 Days or More Past Due Residential real estate loans Term loans by origination year 2020 $ 208,679 207,432 1,247 — 2019 181,924 179,915 2,009 — 2018 100,273 99,135 556 582 2017 76,394 75,527 867 — 2016 53,819 52,905 87 827 Prior 179,085 174,281 1,876 2,928 Revolving loans 2,334 2,334 — — Total $ 802,508 791,529 6,642 4,337 Home equity loans Term loans by origination year 2020 $ 89 89 — — 2019 807 771 — 36 2018 1,782 1,782 — — 2017 1,452 1,426 26 — 2016 1,016 1,016 — — Prior 14,025 13,042 463 520 Revolving loans 617,234 612,545 2,397 2,292 Total $ 636,405 630,671 2,886 2,848 Other consumer loans Term loans by origination year 2020 $ 131,302 131,098 158 46 2019 66,327 65,921 170 236 2018 42,827 42,557 212 58 2017 16,287 16,202 38 47 2016 10,519 10,409 48 62 Prior 18,692 17,334 1,155 203 Revolving loans 27,117 26,704 411 2 Total $ 313,071 310,225 2,192 654

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2021
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, 2021 December 31, 2020 Land $ 75,110 56,842 Buildings and construction in progress 292,371 259,389 Furniture, fixtures and equipment 113,650 102,749 Leasehold improvements 14,935 13,364 Accumulated depreciation (173,647) (159,555) Net premises and equipment, excluding ROU assets 322,419 272,789 ROU assets 50,178 52,546 Net premises and equipment $ 372,597 325,335 Leases The Company leases certain land, premises and equipment from third parties. 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, 2021 December 31, 2020 (Dollars in thousands) Finance Operating Finance Operating ROU assets $ 5,995 5,999 Accumulated depreciation (516) (273) Net ROU assets $ 5,479 44,699 5,726 46,820 Lease liabilities $ 5,781 47,901 5,891 49,675 Weighted-average remaining lease term 23 years 16 years 24 years 17 years Weighted-average discount rate 2.6 % 3.4 % 2.6 % 3.4 % Maturities of lease liabilities consist of the following: December 31, 2021 (Dollars in thousands) Finance Operating Maturing within one year $ 266 5,355 Maturing one year through two years 272 4,329 Maturing two years through three years 280 3,982 Maturing three years through four years 285 3,859 Maturing four years through five years 292 3,753 Thereafter 6,443 43,694 Total lease payments 7,838 64,972 Present value of lease payments Short-term 118 1,455 Long-term 5,663 46,446 Total present value of lease payments 5,781 47,901 Difference between lease payments and present value of lease payments $ 2,057 17,071 The components of lease expense consist of the following: Year ended (Dollars in thousands) December 31, December 31, Finance lease cost Amortization of ROU assets 245 235 Interest on lease liabilities 151 159 Operating lease cost 5,668 4,807 Short-term lease cost 353 331 Variable lease cost 1,018 1,270 Sublease income (42) (12) Total lease expense 7,393 6,790 Supplemental cash flow information related to leases is as follows: Year ended December 31, 2021 December 31, 2020 (Dollars in thousands) Finance Operating Finance Operating Cash paid for amounts included in the measurement of lease liabilities Operating cash flows $ 151 3,381 159 2,742 Financing cash flows 110 N/A 93 N/A ______________________________ N/A - Not applicable

Other Intangible Assets and Goo

Other Intangible Assets and Goodwill	12 Months Ended
	Dec. 31, 2021
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 $ 95,120 88,099 85,506 Accumulated amortization (42,861) (32,590) (22,220) Net carrying value $ 52,259 55,509 63,286 Aggregate amortization expense $ 10,271 10,370 8,485 Estimated amortization expense for the years ending December 31, 2022 $ 10,658 2023 9,731 2024 8,815 2025 7,611 2026 6,561 Core deposit intangibles increased $7,021,000, $2,593,000 and $22,529,000 during 2021, 2020 and 2019, respectively, due to acquisitions. For additional information relating to acquisitions, see Note 23. 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 $ 514,013 456,418 289,586 Acquisitions and adjustments 471,380 57,595 166,832 Net carrying value at end of period $ 985,393 514,013 456,418 The Company evaluates goodwill for possible impairment utilizing 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 2021 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 2021 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, 2021. 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, 2021 and 2020.

Loan Servicing

Loan Servicing	12 Months Ended
	Dec. 31, 2021
Mortgage Banking [Abstract]
Loan Servicing	Loan Servicing Mortgage loans that are serviced for others are not reported as assets, only the servicing rights are recorded and included in other assets. The following schedules disclose the change in the carrying value of mortgage servicing rights that is included in other assets, principal balances of loans serviced and the fair value of mortgage servicing rights: Years ended (Dollars in thousands) December 31, December 31, December 31, Carrying value at beginning of period $ 8,976 1,618 1,545 Acquisitions 1,354 — — Additions 4,435 8,298 325 Amortization (1,926) (940) (252) Carrying value at end of period $ 12,839 8,976 1,618 Principal balances of loans serviced for others $ 1,639,058 1,269,080 185,897 Fair value of servicing rights $ 16,938 12,087 1,763

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2021
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 $ 121,625 90,183 Accrued interest receivable 519 410 Other assets 41,363 40,282 Total assets $ 163,507 130,875 Liabilities Other borrowed funds $ 38,313 27,176 Accrued interest payable 117 53 Other liabilities 164 171 Total liabilities $ 38,594 27,400 Unconsolidated Variable Interest Entities The Company has equity investments in LIHTC partnerships, both directly and through tax credit funds, with carrying values of $50,725,000 and $45,953,000 as of December 31, 2021 and 2020, 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, 2021, 2020 and 2019. Future unfunded contingent equity commitments related to the Company’s LIHTC investments at December 31, 2021 are as follows: (Dollars in thousands) Amount Years ending December 31, 2022 $ 31,725 2023 26,726 2024 8,927 2025 299 2026 333 Thereafter 854 Total $ 68,864 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, 2021 December 31, 2020 December 31, Amortization expense $ 8,671 7,656 6,289 Tax credits and other tax benefits recognized 12,264 10,382 8,547 The Company also owns the following trust subsidiaries, each of which issued trust preferred securities as 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

Deposits

Deposits	12 Months Ended
	Dec. 31, 2021
Deposits [Abstract]
Deposits	Deposits Time deposits that meet or exceed the Federal Deposit Insurance Corporation Insurance (“FDIC”) limit of $250,000 at December 31, 2021 and 2020 were $298,512,000 and $297,975,000, respectively. The scheduled maturities of time deposits are as follows: (Dollars in thousands) Amount Years ending December 31, 2022 $ 717,501 2023 145,828 2024 58,130 2025 69,448 2026 43,465 Thereafter 1,705 $ 1,036,077

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Borrowings	Borrowings The Company’s repurchase agreements totaled $1,020,794,000 and $1,004,583,000 at December 31, 2021 and 2020, respectively, and are secured by debt securities with carrying values of $1,233,885,000 and $1,151,264,000, 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, 2021 December 31, 2020 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous State and local governments $ — 787,016 Corporate bonds — 217,567 Residential mortgage-backed securities 1,020,794 — Total $ 1,020,794 1,004,583 FHLB 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 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. During 2020, the Company paid down all FHLB advances and they were zero at December 31, 2021, and 2020. The Company’s other borrowings consisted of finance lease liabilities and other debt obligations through consolidation of certain VIEs. At December 31, 2021, the Company had $635,000,000 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, 2021
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, 2021 Rate Structure Maturity (Dollars in thousands) Balance Rate Subordinated debentures owed to trust subsidiaries First Company Statutory Trust 2001 $ 3,521 3.432 % 3 month LIBOR plus 3.30% 07/31/2031 First Company Statutory Trust 2003 2,587 3.470 % 3 month LIBOR plus 3.25% 03/26/2033 Glacier Capital Trust II 46,393 2.874 % 3 month LIBOR plus 2.75% 04/07/2034 Citizens (ID) Statutory Trust I 5,155 2.866 % 3 month LIBOR plus 2.65% 06/17/2034 Glacier Capital Trust III 36,083 1.414 % 3 month LIBOR plus 1.29% 04/07/2036 Glacier Capital Trust IV 30,928 1.773 % 3 month LIBOR plus 1.57% 09/15/2036 Bank of the San Juans Bancorporation Trust I 2,041 1.991 % 3 month LIBOR plus 1.82% 03/01/2037 FNB (UT) Statutory Trust I 4,124 3.320 % 3 month LIBOR plus 3.10% 06/26/2033 FNB (UT) Statutory Trust II 1,788 1.923 % 3 month LIBOR plus 1.72% 12/15/2036 Total subordinated debentures owed to trust subsidiaries $ 132,620 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. Provisions of the Dodd-Frank Act require that if a depository institution holding company exceeds $15 billion due to an acquisition, then trust preferred securities are to be excluded from Tier 1 capital beginning in the period in which the transaction occurred. During 2020, the Company’s acquisition of SBAZ on February 29, 2020, resulted in total consolidated assets exceeding $15 billion; accordingly the trust preferred securities were included in Tier 2 capital instead of Tier 1 beginning in 2020. Subordinated Debentures The Company acquired subordinated debentures with the FSB acquisition that qualified as Tier 2 capital under the applicable capital adequacy rules and regulations promulgated by the FRB. The Tier 2 subordinated debentures were not deposits and were not insured by the FDIC or any other government agency. Such obligations were subordinated to the claims of general creditors, were unsecured and were ineligible as collateral. The principal amount was due at maturity and interest distributions were payable quarterly. The Tier 2 subordinated debentures should not be prepaid prior to the fifth anniversary of the closing date, which was 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 prepaid this obligation in 2021.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities Cash Flow Hedges 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 caps and interest rate swaps have been entered into to manage interest rate risk associated with forecasted variable rate borrowings. Interest Rate Cap Derivatives. In March 2020, the Company purchased interest rate caps designated as cash flow hedges with notional amounts totaling $130,500,000 on its variable rate subordinated debentures and were determined to be fully effective during the year ended December 31, 2021. The interest rate caps require receipt of variable amounts from the counterparty when interest rates rise above the strike price in the contracts. The strike prices in the five year term contracts range from 1.5 percent to 2 percent plus 3 month LIBOR. At December 31, 2021, and 2020 the interest rate caps had a fair value of $934,000 and $201,000, respectively, and were reported as other assets on the Company’s statements of financial condition. Changes in fair value were recorded in OCI. Amortization recorded on the interest rate caps totaled $168,000 and $126,000, respectively, and was reported as a component of interest expense on subordinated debentures for the year ended December 31, 2021, and 2020, respectively. Interest Rate Swap Derivatives. In 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 other 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. Prior to termination, changes in fair value were recorded in OCI. The Company designated wholesale deposits and FHLB advances for the cash flow hedge and these hedged items were determined to be fully effective during all periods. Interest expense recorded on the interest rate swaps totaled $0, $0 and $5,532,000 during 2021, 2020 and 2019, respectively, and was reported as a component of interest expense on deposits and FHLB advances. 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 effect of cash flow hedge accounting on OCI for the periods ending December 31, 2021, 2020, and 2019 was as follows: Years ended (Dollars in thousands) December 31, December 31, December 31, Amount of gain (loss) recognized in OCI $ 901 (472) (7,047) Amount of loss reclassified from OCI to interest expense — — (10,816) Residential Real Estate Derivatives

Regulatory Capital

Regulatory Capital	12 Months Ended
	Dec. 31, 2021
Banking and Thrift, Interest [Abstract]
Regulatory Capital	Regulatory Capital The Federal Reserve 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, 2021, 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, 2021 and 2020, 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, 2021 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, 2021 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 $ 2,432,364 14.21 % $ 1,369,157 8.00 % N/A N/A Glacier Bank 2,312,775 13.53 % 1,367,488 8.00 % $ 1,709,361 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated 2,136,749 12.49 % 1,026,868 6.00 % N/A N/A Glacier Bank 2,147,660 12.56 % 1,025,616 6.00 % 1,367,488 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated 2,136,749 12.49 % 770,151 4.50 % N/A N/A Glacier Bank 2,147,660 12.56 % 769,212 4.50 % 1,111,084 6.50 % Tier 1 capital (to average assets) Consolidated 2,136,749 8.64 % 989,712 4.00 % N/A N/A Glacier Bank 2,147,660 8.70 % 987,680 4.00 % 1,234,601 5.00 % December 31, 2020 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 $ 1,900,621 14.63 % $ 1,039,094 8.00 % N/A N/A Glacier Bank 1,824,269 14.06 % 1,038,148 8.00 % $ 1,297,686 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated 1,613,066 12.42 % 779,321 6.00 % N/A N/A Glacier Bank 1,674,714 12.91 % 778,611 6.00 % 1,038,148 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated 1,613,066 12.42 % 584,491 4.50 % N/A N/A Glacier Bank 1,674,714 12.91 % 583,959 4.50 % 843,496 6.50 % Tier 1 capital (to average assets) Consolidated 1,613,066 9.12 % 707,823 4.00 % N/A N/A Glacier Bank 1,674,714 9.56 % 700,529 4.00 % 875,662 5.00 % ______________________________ N/A - Not applicable

Stock-based Compensation Plan

Stock-based Compensation Plan	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [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, 2021, the number of shares available to award to employees and directors under the 2015 Stock Incentive Plan was 1,788,367. During 2019 and 2018, the Company also assumed stock-based compensation plans through the Heritage Bancorp and its subsidiary, Heritage Bank of Nevada (“Heritage”) and Columbine Capital Corp. and its subsidiary, Collegiate Peaks Bank (“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, 2021, 2020 and 2019 was $5,342,000, $4,489,000 and $3,803,000, respectively, and the recognized income tax benefit related to this expense was $1,350,000, $1,134,000 and $964,000, respectively. As of December 31, 2021, total unrecognized compensation expense of $6,865,000 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, 2021, 2020 and 2019 was $4,535,000, $4,048,000 and $3,536,000, respectively, and the income tax benefit related to these awards was $1,369,000, $1,089,000 and $1,124,000, 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, 2021: Restricted Weighted- Non-vested at December 31, 2020 188,894 $ 42.81 Granted 148,539 52.01 Vested (104,037) 43.59 Forfeited (7,328) 47.97 Non-vested at December 31, 2021 226,068 48.33 The average remaining contractual term on non-vested restricted stock units at December 31, 2021 is 1.0 years. The aggregate intrinsic value of the non-vested restricted stock units at December 31, 2021 was $12,818,000. 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 issued from the Company's authorized and unissued common 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 2021, 2020, or 2019. Compensation expense related to stock options for the years ended December 31, 2021, 2020, and 2019 was $6,000, $17,000, and $5,415,000, respectively, and the recognized income tax benefit related to this expense was $2,000, $4,000, and $1,372,000. As of December 31, 2021, there was total unrecognized compensation expense of zero related to stock options. The total intrinsic value of options exercised during the years ended December 31, 2021, 2020, and 2019 was $339,000, $1,221,000, and $4,491,000, respectively, and the income tax benefit related to these exercises was zero and $141,000. Total cash received from options exercised during the years ended December 31, 2021 and 2020 was $265,000 and $993,000, respectively. Changes in shares granted for stock options for the year ended December 31, 2021 are summarized as follows: Stock Weighted- Outstanding at December 31, 2020 27,037 $ 23.81 Exercised (11,867) 22.35 Forfeited — — Outstanding at December 31, 2021 15,170 24.96 Exercisable at December 31, 2021 15,170 24.96 The average remaining contractual term on outstanding stock options at December 31, 2021 is 4.7 years. The aggregate intrinsic value of the outstanding stock options at December 31, 2021 was $482,000.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2021
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, paid time off, Profit Sharing and 401(k) Plan, stock-based compensation plan, deferred compensation plans, and supplemental executive retirement plan (“SERP”). 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. Profit Sharing and 401(k) Plan The Company’s Profit Sharing and 401(k) Plan have safe harbor and employer discretionary components. To be eligible to participate in the plan, an employee must be at least 18 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, 2021, 2020, and 2019 was $20,421,000, $22,047,000 and $17,227,000, 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) plan for the years ended December 31, 2021, 2020 and 2019 was $5,267,000, $4,985,000, and $4,236,000, respectively. Deferred Compensation Plans The Company has non-funded deferred compensation plans for directors, eligible employees 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, 2021 and 2020, the liability related to the plans was $8,861,000 and $9,276,000, respectively, and was included in other liabilities. The total amount deferred for the plans was $1,137,000, $1,109,000, and $766,000, for the years ending December 31, 2021, 2020, and 2019, respectively. The participant receives an earnings credit at a rate equal to 50 percent of the Company’s return on average equity. Total expense for the years ended December 31, 2021, 2020, and 2019 for the plans was $470,000, $504,000 and $480,000, respectively. In connection with several acquisitions, the Company assumed the obligations of deferred compensation plans for certain key employees. As of December 31, 2021 and 2020, the liability related to the acquired plans was $18,560,000 and $17,321,000, respectively, and was included in other liabilities. Total expense for the years ended December 31, 2021, 2020, and 2019 for the acquired plans was $1,094,000, $971,000 and $992,000, respectively. Supplemental Executive Retirement Plan The Company has 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, 2021 and 2020, the liability related to the SERP was $3,974,000 and $3,375,000, respectively, and was included in other liabilities. The Company’s required contribution to the SERP for the years ended December 31, 2021, 2020 and 2019 was $858,000, $910,000, and $662,000, respectively. The participant receives an earnings credit at a rate equal to 50 percent of the Company’s return on average equity. Total expense for the years ended December 31, 2021, 2020, and 2019 for the SERP was $164,000, $199,000, and $120,000, respectively.

Other Expenses

Other Expenses	12 Months Ended
	Dec. 31, 2021
Other Expenses [Abstract]
Other Expenses	Other Expenses Other expenses consists of the following: Years ended (Dollars in thousands) December 31, December 31, December 31, Consulting and outside services $ 11,297 11,324 8,276 Mergers and acquisition expenses 9,830 7,812 8,503 Loan expenses 7,438 4,905 4,140 VIE amortization and other expenses 6,323 4,893 4,341 Debit card expenses 5,722 4,947 5,968 Telephone 5,631 5,199 4,827 Business development 5,250 4,645 4,446 Postage 3,681 3,347 3,437 Employee expenses 3,527 2,924 5,138 Printing and supplies 3,334 3,579 3,256 Checking and operating expenses 2,020 4,944 1,757 Accounting and audit fees 1,538 1,895 1,712 Legal fees 1,391 1,658 1,245 (Gain) loss on dispositions of fixed assets (950) 166 686 Other 4,577 4,571 5,043 Total other expenses $ 70,609 66,809 62,775

Federal and State Income Taxes

Federal and State Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Federal and State Income Taxes	Federal and State Income Taxes The following table is a summary of consolidated income tax expense: Years ended (Dollars in thousands) December 31, December 31, December 31, Current Federal $ 51,180 47,775 34,461 State 22,596 20,728 14,545 Total current income tax expense 73,776 68,503 49,006 Deferred 1 Federal (7,151) (5,396) (279) State (1,944) (1,467) (77) Total deferred income tax benefit expense (9,095) (6,863) (356) Total income tax expense $ 64,681 61,640 48,650 ______________________________ 1 Includes tax benefit of operating loss carryforwards of $315,000, $315,000 and $317,000 for the years ended December 31, 2021, 2020, and 2019, 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 % 21.0 % State taxes, net of federal income tax benefit 4.7 % 4.6 % 4.4 % Tax-exempt interest income (4.2 %) (4.0 %) (3.7 %) Tax credits (4.8 %) (4.2 %) (4.5 %) Other, net 1.8 % 1.4 % 1.6 % Effective income tax rate 18.5 % 18.8 % 18.8 % 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 credit losses $ 49,375 44,040 Operating lease liabilities 12,103 12,551 Employee benefits 10,868 9,309 Deferred compensation 8,002 7,638 Acquisition fair market value adjustments 6,891 4,398 Net operating loss carryforwards 1,569 1,884 Available-for-sale debt securities 1,156 — Other 2,787 2,262 Total gross deferred tax assets 92,751 82,082 Deferred tax liabilities Depreciation of premises and equipment (15,749) (14,654) Operating lease ROU assets (11,293) (11,830) Transferred debt securities (10,299) — Intangibles (9,760) (14,671) Deferred loan costs (9,264) (8,940) Mortgage servicing rights (3,244) (2,268) Available-for-sale debt securities — (48,505) Other (5,449) (5,074) Total gross deferred tax liabilities (65,058) (105,942) Net deferred tax asset (liability) $ 27,693 (23,860) The Company has federal net operating loss carryforwards of $5,440,000 expiring between 2024 and 2036. The Company has Colorado net operating loss carryforwards of $9,990,000 expiring between 2030 and 2035. The net operating loss carryforwards originated from acquisitions. The Company and the Bank file consolidated income tax returns for the federal jurisdiction and several states that require consolidated income tax returns. 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, 2021: Years ended December 31, Federal 2010, 2011, 2012, 2013, 2016, 2017, 2018, 2019, and 2020 Colorado 2010, 2011, 2012, 2016, 2017, 2018, 2019, and 2020 Arizona & California 2016, 2017, 2018, 2019, and 2020 Montana, Idaho, Utah, & North Dakota 2017, 2018, 2019, and 2020 Alabama, Alaska, Arkansas, Connecticut, Florida, Georgia, Indiana, Kentucky, Louisiana, Massachusetts, Michigan, Minnesota, Missouri, New Jersey, New York, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, & Wisconsin 2019 and 2020 Iowa, Illinois, Kansas, Maryland, Mississippi, North Carolina, Ohio, Oregon 2020 The Company had no unrecognized income tax benefits as of December 31, 2021 and 2020. 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, 2021, 2020, and 2019 was not significant. The Company had no accrued liabilities for the payment of interest or penalties at December 31, 2021 and 2020. The Company has assessed the need for a valuation allowance and determined that a valuation allowance was not necessary at December 31, 2021 and 2020. 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, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income (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 and Transferred Debt Securities (Losses) Gains on Derivatives Used for Cash Flow Hedges Total Balance at January 1, 2019 $ (6,613) (2,814) (9,427) Other comprehensive income (loss) before reclassifications 57,607 (5,261) 52,346 Reclassification adjustments for 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 Other comprehensive income (loss) before reclassifications 104,067 (353) 103,714 Reclassification adjustments for gains included in net income (loss) (850) — (850) Net current period other comprehensive income (loss) 103,217 (353) 102,864 Balance at December 31, 2020 $ 143,443 (353) 143,090 Other comprehensive (loss) income before reclassifications (113,161) 674 (112,487) Reclassification adjustments for gains and transfers included in net income (590) — (590) Reclassifications adjustments for amortization included in net income for transferred securities (2,654) — (2,654) Net current period other comprehensive (loss) income (116,405) 674 (115,731) Balance at December 31, 2021 $ 27,038 321 27,359

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Note 18. 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 $ 284,757 266,400 210,544 Average outstanding shares - basic 99,313,255 94,883,864 88,255,290 Add: dilutive restricted stock units and stock options 84,995 48,489 130,485 Average outstanding shares - diluted 99,398,250 94,932,353 88,385,775 Basic earnings per share $ 2.87 2.81 2.39 Diluted earnings per share $ 2.86 2.81 2.38 Restricted stock units and stock options excluded from the diluted average outstanding share calculation 1 194 88,240 — ______________________________ 1 Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock unit 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, 2021
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 $ 27,945 41,451 Interest bearing cash deposits 91,361 43,975 Cash and cash equivalents 119,306 85,426 Other assets 22,218 11,823 Investment in subsidiaries 3,188,210 2,369,040 Total assets $ 3,329,734 2,466,289 Liabilities and Stockholders’ Equity Dividends payable $ 11,520 14,717 Subordinated debentures 132,620 139,959 Other liabilities 7,972 4,572 Total liabilities 152,112 159,248 Common stock 1,107 954 Paid-in capital 2,338,814 1,495,053 Retained earnings 810,342 667,944 Accumulated other comprehensive income 27,359 143,090 Total stockholders’ equity 3,177,622 2,307,041 Total liabilities and stockholders’ equity $ 3,329,734 2,466,289 Condensed Statements of Operations and Comprehensive Income Years ended (Dollars in thousands) December 31, December 31, December 31, Income Dividends from subsidiaries $ 207,000 188,000 142,000 Intercompany charges for services 2,654 2,332 20,661 Other income 500 954 513 Total income 210,154 191,286 163,174 Expenses Compensation and employee benefits 6,516 5,646 25,806 Other operating expenses 13,624 10,051 15,118 Total expenses 20,140 15,697 40,924 Income before income tax benefit and equity in undistributed net income of subsidiaries 190,014 175,589 122,250 Income tax benefit 3,407 3,108 4,488 Income before equity in undistributed net income of subsidiaries 193,421 178,697 126,738 Equity in undistributed net income of subsidiaries 91,336 87,703 83,806 Net Income $ 284,757 266,400 210,544 Comprehensive Income $ 169,026 369,264 260,197 Condensed Statements of Cash Flows Years ended (Dollars in thousands) December 31, December 31, December 31, Operating Activities Net income $ 284,757 266,400 210,544 Adjustments to reconcile net income to net cash provided by operating activities: Subsidiary income in excess of dividends distributed (91,336) (87,703) (83,806) Stock-based compensation, net of tax benefits 1,628 1,216 1,320 Net change in other assets and other liabilities (7,245) (7,222) 1,854 Net cash provided by operating activities 187,804 172,691 129,912 Investing Activities Net additions of premises and equipment (13) (111) (114) Proceeds from sale of marketable equity securities 186 — 89 Equity received from (contributed to) subsidiaries 248 (13,638) (13,485) Net cash provided by (used in) investing activities 421 (13,749) (13,510) Financing Activities Net decrease in other borrowed funds (7,500) — — Cash dividends paid (145,557) (131,263) (124,468) Tax withholding payments for stock-based compensation (1,553) (1,082) (1,293) Proceeds from stock option exercises 265 993 2,896 Net cash used in financing activities (154,345) (131,352) (122,865) Net increase (decrease) in cash, cash equivalents and restricted cash 33,880 27,590 (6,463) Cash, cash equivalents and restricted cash at beginning of period 85,426 57,836 64,299 Cash, cash equivalents and restricted cash at end of period $ 119,306 85,426 57,836

Unaudited Quarterly Financial D

Unaudited Quarterly Financial Data (Condensed)	12 Months Ended
	Dec. 31, 2021
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 2021 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 161,552 159,956 166,741 192,825 Interest expense 4,740 4,487 4,128 5,203 Net interest income 156,812 155,469 162,613 187,622 Provision for credit losses 48 (5,653) 725 27,956 Net interest income after provision for credit losses 156,764 161,122 161,888 159,666 Non-interest income 40,121 35,522 34,815 34,362 Non-interest expense 96,585 100,082 104,108 134,047 Income before income taxes 100,300 96,562 92,595 59,981 Federal and state income tax expense 19,498 18,935 16,976 9,272 Net income $ 80,802 77,627 75,619 50,709 Basic earnings per share $ 0.85 0.81 0.79 0.46 Diluted earnings per share $ 0.85 0.81 0.79 0.46 Quarters ended 2020 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 142,865 155,404 157,487 171,308 Interest expense 8,496 7,185 6,084 5,550 Net interest income 134,369 148,219 151,403 165,758 Provision for credit losses 19,185 16,929 5,186 (1,535) Net interest income after provision for credit losses 115,184 131,290 146,217 167,293 Non-interest income 33,272 41,224 53,667 44,704 Non-interest expense 95,487 94,764 103,373 111,187 Income before income taxes 52,969 77,750 96,511 100,810 Federal and state income tax expense 9,630 14,306 18,754 18,950 Net income $ 43,339 63,444 77,757 81,860 Basic earnings per share $ 0.46 0.67 0.81 0.86 Diluted earnings per share $ 0.46 0.66 0.81 0.86

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	12 Months Ended
	Dec. 31, 2021
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, 2021, 2020, and 2019. 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, 2021. Debt securities, available-for-sale. The 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 $5,496,000, net losses of $5,368,000 and net gains of $661,000 for the years ended December 31, 2021, 2020 and 2019, 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. Loan interest rate lock commitments. F air value estimates for loan interest rate lock commitments were based upon the estimated sales price, origination fees, direct costs, interest rate changes, etc. and were obtained from an independent third party. The components of the valuation were observable or could be corroborated by observable market data and, therefore, were classified within Level 2 of the valuation hierarchy. Forward commitments to sell TBA securities. Fo rward commitments to sell TBA securities are used to economically hedge the interest rate risk associated with certain loan commitments. The fair value estimates for the TBA commitments were based upon the estimated sale of the TBA hedge obtained from an independent third party. The components of the valuation were observable or could be corroborated by observable market data and, therefore, were classified within Level 2 of the valuation hierarchy. Interest rate cap derivative financial instrum ents. F air value estimates for interest rate cap derivative financial instruments were based upon the discounted cash flows of known payments plus the option value of each caplet which incorporates market rate forecasts and implied market volatilities. The components of the valuation were observable or could be corroborated by observable market data and, therefore, were classified within Level 2 of the valuation hierarchy. The Company also obtained and compared the reasonableness of the pricing from independent third party valuations. 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 Quoted Prices Significant Significant Debt securities, available-for-sale U.S. government and federal agency $ 1,346,749 — 1,346,749 — U.S. government sponsored enterprises 240,693 — 240,693 — State and local governments 488,858 — 488,858 — Corporate bonds 180,752 — 180,752 — Residential mortgage-backed securities 5,699,659 — 5,699,659 — Commercial mortgage-backed securities 1,214,138 — 1,214,138 — Loans held for sale, at fair value 60,797 — 60,797 — Interest rate caps 934 — 934 — Interest rate locks 3,008 — 3,008 — Total assets measured at fair value on a recurring basis $ 9,235,588 — 9,235,588 — TBA hedge $ 80 — 80 — Total liabilities measured at fair value on a recurring basis $ 80 — 80 — Fair Value Measurements (Dollars in thousands) Fair Value December 31, 2020 Quoted Prices Significant Significant Debt securities, available-for-sale U.S. government and federal agency $ 38,588 — 38,588 — U.S. government sponsored enterprises 9,781 — 9,781 — State and local governments 1,416,683 — 1,416,683 — Corporate bonds 349,098 — 349,098 — Residential mortgage-backed securities 2,289,090 — 2,289,090 — Commercial mortgage-backed securities 1,234,574 — 1,234,574 — Loans held for sale, at fair value 166,572 — 166,572 — Interest rate caps 201 — 201 — Interest rate locks 8,605 — 8,605 — Total assets measured at fair value on a recurring basis $ 5,513,192 — 5,513,192 — TBA hedge $ 2,056 — 2,056 — Total liabilities measured at fair value on a recurring basis $ 2,056 — 2,056 — 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, 2021. 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 loans, net of ACL. Fair value estimates of collateral-dependent loans that are individually reviewed are based on the fair value of the collateral, less estimated cost to sell. Collateral-dependent individually reviewed 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, 2021 Quoted Prices Significant Significant Collateral-dependent impaired loans, net of ACL 22,036 — — 22,036 Total assets measured at fair value on a non-recurring basis $ 22,036 — — 22,036 Fair Value Measurements (Dollars in thousands) Fair Value December 31, 2020 Quoted Prices Significant Significant Other real estate owned $ 564 — — 564 Collateral-dependent impaired loans, net of ACL 26,749 — — 26,749 Total assets measured at fair value on a non-recurring basis $ 27,313 — — 27,313 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 Collateral-dependent $ 20,934 Cost approach Selling costs 10.0% - 10.0% (10.0%) 1,102 Sales comparison approach Selling costs 5.0% - 10.0% (6.7%) Adjustment to comparables 0.0% - 10.0% (6.0%) $ 22,036 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 $ 564 Sales comparison approach Selling costs 8.0% - 10.0% (9.0%) Collateral-dependent impaired loans, net of ACL $ 144 Cost approach Selling costs 10.0% - 10.0% (10.0%) 25,309 Sales comparison approach Selling Costs 10.0% - 10.0% (0.1%) Adjustment to comparables 0.0% - 100.0% (11.1%) 1,296 Combined approach Selling costs 10.0% - 10.0% (10.0%) Discount rate 8.0% - 8.0% (8.0%) $ 26,749 ______________________________ 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. There have been no significant changes in the valuation techniques during the period ended December 31, 2021. Cash and cash equivalents: fair value is estimated at book value. Debt securities, held-to-maturity: fair value for held-to-maturity debt securities is estimated in the same manner as available-for sale debt securities, which is described above. Loans receivable, net of ACL: The loans were fair valued on an individual basis, with consideration given to the loans' underlying characteristics, including account types, remaining terms and balance, interest rates, past delinquencies, current market rates, etc. The model utilizes a discounted cash flow approach to estimate the fair value of the loans using various assumptions such as prepayment speeds, projected default probabilities, losses given defaults, etc. The discounted cash flow approach models the credit losses directly in the projected cash flows. The model applies various assumptions regarding credit, interest, and prepayment risks for the loans based on loan types, payment types and fixed or variable classifications. Term Deposits: fair value of term deposits is estimated by discounting the future cash flows using rates of similar deposits with similar maturities. The market rates used were obtained from an independent third party based on current rates offered by the Company’s regional competitors. Repurchase agreements and other borrowed funds: fair value of term repurchase agreements and other term borrowings is estimated based on current repurchase rates and borrowing rates currently available to the Company for repurchases and borrowings with similar terms and maturities. The estimated fair value for overnight repurchase agreements and other borrowings is book value. Subordinated debentures: fair value of the subordinated debt is estimated by discounting the estimated future cash flows using current estimated market rates obtained from an independent third party. Off-balance sheet financial instruments: unused lines of credit and letters of credit represent the principal categories of off-balance sheet financial instruments. The fair value of commitments is based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing. The fair value of unused lines of credit and letters of credit is not material; therefore, such commitments are not included in the following tables. Fair Value Measurements (Dollars in thousands) Carrying Amount December 31, 2021 Quoted Prices Significant Significant Financial assets Cash and cash equivalents $ 437,686 437,686 — — Debt securities, held-to-maturity 1,199,164 — 1,220,883 — Loans receivable, net of ACL 13,259,366 — — 13,422,898 Total financial assets $ 14,896,216 437,686 1,220,883 13,422,898 Financial liabilities Term deposits $ 1,036,077 — 1,040,100 — Repurchase agreements and other borrowed funds 1,064,888 — 1,064,888 — Subordinated debentures 132,620 — 131,513 — Total financial liabilities $ 2,233,585 — 2,236,501 — Fair Value Measurements (Dollars in thousands) Carrying Amount December 31, 2020 Quoted Prices Significant Significant Financial assets Cash and cash equivalents $ 633,142 633,142 — — Debt securities, held-to-maturity 189,836 — 203,216 — Loans receivable, net of ACL 10,964,453 — — 11,233,002 Total financial assets $ 11,787,431 633,142 203,216 11,233,002 Financial liabilities Term deposits $ 978,779 — 983,491 — Repurchase agreements and other borrowed funds 1,037,651 — 1,037,651 — Subordinated debentures 139,959 — 123,944 — Total financial liabilities $ 2,156,389 — 2,145,086 —

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	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 off-balance sheet 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 $ 4,271,583 2,957,259 Letters of credit 120,436 65,361 Total outstanding commitments $ 4,392,019 3,022,620 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, 2021
Business Combination and Asset Acquisition [Abstract]
Mergers and Acquisitions	Mergers and Acquisitions The Company has completed the following acquisitions during the last two years: • Altabancorp and its wholly-owned subsidiary, Altabank • State Bank Corp. and its wholly-owned subsidiary, State Bank of Arizona The assets and liabilities of Alta and SBAZ 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) Alta SBAZ Fair value of consideration transferred Fair value of Company shares issued $ 839,853 112,133 Cash consideration 9 13,721 Total fair value of consideration transferred 839,862 125,854 Recognized amounts of identifiable assets acquired and liabilities assumed Identifiable assets acquired Cash and cash equivalents 1,622,727 57,434 Debt securities 6,658 142,174 Loans receivable, net of ACL 1,901,950 451,653 Core deposit intangible 1 7,021 2,593 Accrued income and other assets 121,926 33,971 Total identifiable assets acquired 3,660,282 687,825 Liabilities assumed Deposits 3,273,819 603,289 Borrowings — 10,904 Accrued expenses and other liabilities 17,981 5,373 Total liabilities assumed 3,291,800 619,566 Total identifiable net assets 368,482 68,259 Goodwill recognized $ 471,380 57,595 ______________________________ 1 The core deposit intangible for each acquisition was determined to have an estimated life of 10 years . 2021 Acquisition On October 1, 2021, the Company acquired 100 percent of the outstanding common stock of Altabancorp and its wholly-owned subsidiary, Altabank, a community bank based in American Fork, Utah. Altabank provides banking services to individuals and businesses in Utah with twenty-five banking offices from Preston, Idaho to St. George, Utah. The acquisition significantly increased the Company’s presence in the State of Utah. Alta operates as a new division of the Bank under its existing name and management team. The Alta acquisition was valued at $839,862,000 and resulted in the Company issuing 15,173,482 shares of its common stock and paying $9,000 in cash in exchange for all of Alta’s outstanding common stock shares. The fair value of the Company shares issued was determined on the basis of the opening market price of the Company’s common stock on the October 1, 2021 acquisition date. The excess of the preliminary 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 Alta. None of the goodwill is deductible for income tax purposes as the acquisition was accounted for as a tax-free exchange. The fair value of the Alta’s assets acquired include gross loans with fair values of $1,902,321,000. The gross principal and contractual interest due under Alta contracts was $1,923,392,000. The Company evaluated the principal and contractual interest due at the acquisition date and determined that an insignificant amount were not expected to be collectible. The Company incurred $9,546,000 of expenses in connection with this acquisition during the year ended December 31, 2021. 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 Alta was approximately $29,966,000 and net loss was approximately $9,415,000 from October 1, 2021 to December 31, 2021. The following unaudited pro forma summary presents consolidated information of the Company as if the Alta acquisition had occurred on January 1, 2020: Year ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income 886,370 898,761 Net income 296,940 309,902 2020 Acquisitions On February 29, 2020, the Company acquired 100 percent of the outstanding common stock of State Bank Corp. and its wholly-owned subsidiary, State Bank of Arizona, a community bank based in Lake Havasu City, Arizona. SBAZ was merged into the Company and its banking operations were incorporated into The Foothills Bank division of Glacier Bank, continuing to provide banking services to individuals and businesses in Arizona with locations in Bullhead City, Cottonwood, Kingman, Lake Havasu City, Phoenix, Prescott Valley and Prescott. The preliminary value of the SBAZ acquisition was $125,854,000 and resulted in the Company issuing 3,007,044 shares of its common stock and paying $13,721,000 in cash in exchange for all of SBAZ’s outstanding common stock shares. The fair value of the Company shares issued was determined on the basis of the closing market price of the Company’s common stock on the February 29, 2020 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 SBAZ. 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 SBAZ assets acquired include loans with fair value of $451,702,000, respectively. The gross principal and contractual interest due under the contracts was $452,510,000. The Company evaluated the principal and contractual interest due at the acquisition date and determined that insignificant amounts were not expected to be collectible. The Company incurred $4,489,000 of expenses in connection with the acquisition, respectively, during the year ended December 31, 2021. 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 SBAZ was approximately $31,606,000 and net income was approximately $8,524,000 from February 29, 2020 to December 31, 2021. The following unaudited pro forma summary presents consolidated information of the Company as if the acquisition had occurred on January 1, 2019: Year ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income 777,869 664,789 Net income 265,289 218,365

Nature of Operations and Summ_2

Nature of Operations and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
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 and loan servicing. 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 credit losses (“ACL” or “allowance”) on loans; 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 ACL on loans and real estate valuation estimates, management obtains independent appraisals (new or updated) for significant items. Estimates relating to the investment valuations are obtained from independent third parties. Estimates relating to the evaluation of goodwill for impairment are determined based on internal calculations using independent party inputs.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements of the Company include the parent holding company and the Bank, which consists of seventeen bank divisions and a corporate division. The corporate division includes the Bank’s investment portfolio, wholesale borrowings and other centralized functions. 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. 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. On October 1, 2021, the Company completed the acquisition of Altabancorp, the bank holding company for Altabank, a community bank based in American Fork, Utah (collectively, “Alta”). In February 2020, the Company completed the acquisition of State Bank Corp., the bank holding company for State Bank of Arizona, a community bank based in Lake Havasu City, Arizona (collectively, “SBAZ”). 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”). 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 23.
Cash and Cash Equivalents	Cash and Cash EquivalentsCash 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.
Debt Securities	Debt Securities On January 1, 2020, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2016-13, Financial Instruments - Credit Losses , which significantly changed the allowance for credit loss accounting policies for debt securities. The following debt securities and allowance for credit loss accounting policies are presented under Accounting Standards Codification™ (“ASC”) Topic 326. 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. When the Company acquires another entity, it records the debt securities at fair value. The Company reviews and analyzes the various risks that may be present within the investment portfolio on an ongoing basis, including market risk, credit risk and liquidity 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. The credit rating of a security is considered the primary credit quality indicator for debt securities. Liquidity risk refers to the risk that a security will not have an active and efficient market in which the security can be sold. A debt security is investment grade if the issuer has 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. The Company has acquired debt securities through acquisitions and if the securities have more than insignificant credit deterioration since origination, they are designated as purchased credit-deteriorated (“PCD”) securities. An ACL is determined using the same methodology as with other debt securities. The sum of a PCD security’s fair value and associated ACL becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the debt security is a noncredit discount or premium, which is amortized into interest income over the life of the security. Subsequent changes to the ACL are recorded through provision for credit losses. For additional information relating to debt securities, see Note 2. Allowance for Credit Losses - Available-for-Sale Debt Securities For available-for-sale debt securities in an unrealized loss position, the Company first assesses whether it intends to sell, or it is more-likely-than-not that it will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through other expense. For the available-for-sale securities that do not meet the aforementioned criteria, the Company evaluates whether the decline in fair value has resulted from cred it losses or other factors. In such assessment, the Company considers the extent to which fair value is less than amortized cost, if there are any changes to the investment grade of the security by a rating agency, and if there are any adverse conditions that impact the security. If this assessment indicates a credit loss exists, the present value of the cash flows expected to be collected from the security is compared to the amortized cost basis of the s ecurity. If the present value of the cash flows expected to be collected is less than the amortized cost basis, a potential credit loss exists and an ACL is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost. Any estimated credit losses that have not been recorded through an ACL are recognized in OCI. The Company has elected to exclude accrued interest from the estimate of credit losses for available-for-sale debt securities. As part of its non-accrual policy, the Company charges-off uncollectable interest at the time it is determined to be uncollectable. Allowance for Credit Losses - Held-to-Maturity Debt Securities For estimating the allowance for held-to-maturity (“HTM”) debt securities that share similar risk characteristics with other securities, such securities are pooled based on major security type. For pools of such securities with similar risk characteristics, the historical lifetime probability of default and severity of loss in the event of default is derived or obtained from external sources and adjusted for the expected effects of reasonable and supportable forecasts over the expected lives of the securities on those historical credit losses. Expected credit losses on securities in the held-to-maturity portfolio that do not share similar risk characteristics with any of the pools of debt securities are individually measured based on net realizable value, or the difference between the discounted value of the expected future cash flows, based on the original effective interest rate, and the recorded amortized cost basis of the securities.
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 and may or may not be sold with servicing rights released. Changes in fair value are recognized in non-interest income. Fair value elections are made at the time of origination based on the Company’s fair value election policy.
Loans Receivable	Loans Receivable On January 1, 2020, the Company adopted FASB ASU 2016-13, Financial Instruments - Credit Losses , which significantly changed the loan and allowance for credit loss accounting policies. The following loan and allowance for credit loss accounting policies are presented under ASC Topic 326, whereas prior periods are presented in accordance with the incurred loss model as disclosed in the Company’s 2019 Annual Report on Form 10-K. The Company’s loan segments or classes are based on the purpose of the loan and consist of residential real estate, commercial real estate, other commercial, home equity, and other consumer loans. Loans that are intended at origination to be held-to-maturity, are reported at the unpaid principal balance less net c harge-offs and adjusted for deferred fees and costs on originated loans and unamortized premiums or discounts on acquired loans. Interest income is accrued on the unpaid principal balance. 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 or straight-line methods. The interest method is utilized for loans with scheduled payment terms and the objective is to calculate periodic interest income at a constant effective yield. The straight-line method is utilized for revolving lines of credit or loans with no scheduled payment terms. When a loan is paid off prior to maturity, the remaining unamortized fees and costs on originated loans and unamortized premiums or discounts on acquired loans are immediately recognized as interest income. 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 has acquired loans through acquisitions, some of which have experienced more than insignificant credit deterioration since origination. The Company considers all acquired non-accrual loans to be PCD loans. In addition, the Company considers loans accruing ninety days or more past due or substandard loans to be PCD loans. An ACL is determined using the same methodology as other loans held for investment. The ACL determined on a collective basis is allocated to individual loans. The sum of a loan’s fair value and ACL becomes the initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. Subsequent changes to the ACL are recorded through provision for credit losses.
Allowance for Credit Losses - Loans Receivable	Allowance for Credit Losses - Loans Receivable The allowance for credit losses for loans receivable represents management’s estimate of credit losses over the expected contractual life of the loan portfolio. The estimate is determined based on the amortized cost of the loan portfolio including the loan balance adjusted for charge-offs, recoveries, deferred fees and costs, and loan discount and premiums. Recoveries are included only to the extent that such amounts were previously charged-off. The Company has elected to exclude accrued interest from the estimate of credit losses for loans. Determining the adequacy of the allowance is complex and requires a high degree of judgment by management about the effect of matters that are inherently uncertain. Subsequent evaluations of the then-existing loan portfolio, in light of the factors then prevailing, may result in significant changes in the allowance in those future periods. The allowance is increased for estimated credit losses which are recorded as expense. The portion of loans and overdraft balances determined by management to be uncollectable are charged-off as a reduction to the allowance and recoveries of amounts previously charged-off increase the allowance. 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. The expected credit loss estimate process involves procedures to consider the unique characteristics of each of the Company’s loan portfolio segments, which consist of residential real estate, commercial real estate, other commercial, home equity, and other consumer loans. When computing the allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, credit and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. The Company has determined a four consecutive quarter forecasting period is a reasonable and supportable period. Expected credit loss for periods beyond reasonable and supportable forecast periods are determined based on a reversion method which reverts back to historical loss estimate over a four consecutive quarter period on a straight-line basis. Credit quality is assessed and monitored by evaluating various attributes and the results of those evaluations are utilized in underwriting new loans and the process for estimating the expected credit losses. The following paragraphs describe the risk characteristics relevant to each portfolio segment. 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 residential property securing the loans and affect the borrowers' personal incomes. Mitigating risk factors for this loan segment 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 segment 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 allowance is impacted by loan volumes, delinquency status, credit ratings, historical loss experiences, estimated prepayment speeds, weighted average lives and other conditions influencing loss expectations, such as reasonable and supportable forecasts of economic conditions. The methodology for estimating the amount of expected credit losses reported in the allowance has two basic components: 1) individual loans that do not share similar risk characteristics with other loans and the measurement of expected credit losses for such individual loans; and 2) the expected credit losses for pools of loans that share similar risk characteristics. Loans that do not Share Similar Risk Characteristics with Other Loans. For a loan that does not share similar risk characteristics with other loans, expected credit loss is measured based on the net realizable value, that is, the difference between the discounted value of the expected future cash flows, based on the original effective interest rate, and the amortized cost basis of the loan. For these loans, the expected credit loss is equal to the amount by which the net realizable value of the loan is less than the amortized cost basis of the loan (which is net of previous charge-offs and deferred loan fees and costs), except when the loan is collateral-dependent, that is, when foreclosure is probable or the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. In these cases, expected credit loss is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral. The fair value of the collateral is adjusted for the estimated cost to sell if repayment or satisfaction of a loan is dependent on the sale (rather than only on the operation) of the collateral. The Company has determined that non-accrual loans do not share similar risk characteristics with other loans and these loans are individually evaluated for estimated allowance for credit losses. The Company, through its credit monitoring process, may also identify other loans that do not share similar risk characteristics and individually evaluate such loans. The starting point for determining the fair value of collateral is to obtain external appraisals or evaluations (new or updated). 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 Company’s credit department reviews appraisals, giving consideration to the highest and best use of the collateral. 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. Adjustments may be made to the fair value of the collateral after review and acceptance of the collateral appraisal or evaluation (new or updated). Loans that Share Similar Risk Characteristics with other Loans. For estimating the allowance for loans that share similar risk characteristics with other loans, such loans are segregated into loan segments. Loans are designated into loan segments based on loans pooled by product types and similar risk characteristics or areas of risk concentration. In determining the ACL, the Company derives an estimated credit loss assumption from a model that categorizes loan pools based on loan type which is further segregated by the credit quality indicators. This model calculates an expected loss percentage for each loan segment by considering the non-discounted simple annual average historical loss rate of each loan segment (calculated through an “open pool” method), multiplying the loss rate by the amortized loan balance and incorporating that segment’s internally generated prepayment speed assumption and contractually scheduled remaining principal pay downs on a loan level basis. The annual historical loss rates are adjusted over a reasonable economic forecast period by a multiplier that is calculated based upon current national economic forecasts as a proportion of each segment’s historical average loss levels. The Company will then revert from the economic forecast period back to the historical average loss rate in a straight-line basis. After the reversion period, the loans will be assumed to experience their historical loss rate for the remainder of their contractual lives. The model applies the expected loss rate over the projected cash flows at the individual loan level and then aggregates the losses by loan segment in determining their quantitative allowance. The Company will also include qualitative adjustments to adjust the ACL on loan segments to the extent the current or future market conditions are believed to vary substantially from historical conditions in regards to: • lending policies and procedures; • i nternational, national, regional and local economic business conditions, developments, or environmental conditions that affect the collectability of the portfolio, including the condition of various markets; • the nature and volume of the loan portfolio including the terms of the loans; • the experience, ability, and depth of the lending management and other relevant staff; • the volume and severity of past due and adversely classified or graded loans and the volume of non-accrual loans; • the quality of our loan review system; • the value of underlying collateral for collateralized loans; • the existence and effect of any concentrations of credit, and changes in the level of concentrations; and • the effect of external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the existing portfolio. The Company regularly reviews loans in the portfolio to assess credit quality indicators and to determine the appropriate loan classification and grading in accordance with applicable bank regulations. The primary credit quality indicator for residential, home equity and other consumer loans is the days past due status, which consists of the following categories: 1) performing loans; 2) 30 to 89 days past due loans; and 3) non-accrual and ninety days or more past due loans. The primary credit quality indicator for commercial real estate and commercial loans is the Company’s internal risk rating system, which includes the following categories: 1) pass loans; 2) special mention loans; 3) substandard loans; and 4) doubtful or loss loans. Such credit quality indicators are regularly monitored and incorporated into the Company’s allowance estimate. The following paragraphs further define the internal risk ratings for commercial real estate and commercial loans. Pass Loans. These ratings represent loans that are of acceptable, good or excellent quality with very limited to no risk. Loans that do not have one of the following ratings are considered pass loans. Special Mention Loans. These ratings represent loans that are designated as special mention per the regulatory definition. Special mention loans are currently protected but are potentially weak. The credit risk may be relatively minor yet constitute an undue and unwarranted risk in light of the circumstances surrounding a specific loan. The rating may be used to identify credit with potential weaknesses that if not corrected may weaken the loan to the point of inadequately protecting the Bank’s credit position. Examples include a lack of supervision, inadequate loan agreement, condition, or control of collateral, incomplete, or improper documentation, deviations from lending policy, and adverse trends in operations or economic conditions. Substandard Loans. This rating represents loans that are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged. A loan so classified must have a well-defined weakness that jeopardizes the liquidation of the debt. These loans are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected. Loss potential, while existing in the aggregated amount of substandard loans, does not have to exist in an individual loan classified substandard. Doubtful/Loss Loans. A loan classified as doubtful has the characteristics that make collection in full, on the basis of currently existing facts, conditions, and values, highly improbable. The possibility of loss is extremely high, but because of pending factors, which may work to the advantage and strengthening of the loan, its classification as loss is deferred until its more exact status may be determined. Pending factors include proposed merger, acquisition, or liquidation procedures, capital injection, perfecting liens on additional collateral and refinancing plans. Loans are classified as loss when they are deemed to be not collectible and of such little value that continuance as an active asset of the Bank is not warranted. Loans classified as loss must be charged-off. Assignment of this classification does not mean that an asset has absolutely no recovery or salvage value, but that it is not practical or desirable to defer writing off a basically worthless asset, even though partial recovery may be attained in the future. Restructured Loans 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. 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 borrowers who have the willingness and capacity for debt repayment. In determining whether non-restructured or performing loans issued to a single or related party group of borrowers should continue to accrue interest when the borrower has other loans that are non-performing 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. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was signed into law which includes many provisions that impact the Company and its customers. The banking regulatory agencies have encouraged banks to work with borrowers who have been impacted by COVID-19 and the CARES Act, along with related regulatory guidance, allows banks to not designate certain modifications as TDRs that otherwise may have been classified as TDRs. In general, in order to qualify for such treatment, the modifications need to be short-term and made on a good faith basis in response to the COVID-19 pandemic to borrowers who were previously deemed current as outlined in the regulatory guidance. The Company has made such modifications to assist borrowers impacted by the COVID-19 pandemic. The allowance for credit losses on a TDR is measured using the same method as all other loans held for investment. For a TDR that is individually reviewed and not collateral-dependent, the value of the concession can only be measured using the discounted cash flow method. When the value of a concession is measured using the discounted cash flow method, the ACL is determined by discounting the expected future cash flows at the original interest of the loan. Allowance for Credit Losses - Off-Balance Sheet Credit Exposures The Company maintains a separate allowance for credit losses for off-balance sheet credit exposures, including unfunded loan commitments. Such ACL is included in other liabilities on the Company’s statements of financial condition. The Company estimates the amount of expected losses by calculating a commitment usage factor over the contractual period for exposures and applying the loss factors used in the allowance for credit loss methodology to the results of the usage calculation to estimate the liability for credit losses related to unfunded commitments for each loan segment. No credit loss estimate is reported for off-balance sheet credit exposures that are unconditionally cancellable by the Bank or for unfunded amounts under such arrangements that may be drawn prior to the cancellation of the arrangement. Provision for Credit Losses The Company recognizes provision for credit losses on the allowance for off-balance sheet credit exposures (e.g., unfunded loan commitments) together with provision for credit losses on the loan portfolio in the income statement line item provision for credit losses. The following table presents the provision for credit losses on the loan portfolio and off-balance sheet exposures: Year ended (Dollars in thousands) December 31, December 31, December 31, Provision for credit loss loans 16,380 37,637 57 Provision for credit loss unfunded 6,696 2,128 — Total provision for credit losses 23,076 39,765 57 There was no provision for credit losses on debt securities for the years ended December 31, 2021, 2020, and 2019, respectively.
Premises and Equipment	Premises and EquipmentPremises 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.
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. 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.
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
Long-lived Assets	Long-lived AssetsLong-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.
Business Combination 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.
Loan Servicing Rights	Loan Servicing Rights For residential real estate loans that are sold with servicing retained, servicing rights are initially recorded at fair value in other assets and gain on sale of loans. Fair value is based on market prices for comparable mortgage servicing contracts. The servicing asset is subsequently measured using the amortization method which requires the servicing rights to be amortized into non-interest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans.
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.
Other Borrowings	Other BorrowingsBorrowings of the Company’s consolidated variable interest entities and finance lease arrangements are included in other borrowings.
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 The Company is exposed to certain risks relating to its ongoing operations. The primary risk managed by using derivative instruments is interest risk. Interest rate caps and interest rate swaps have been entered into to manage interest rate risk associated with variable rate borrowings and were designated as cash flow hedges. The Company does not enter into derivative instruments for trading or speculative purposes.
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 ASC Topic 606 was $65,194,000, $54,520,000, and $69,877,000 for the years ended December 31, 2021, 2020, and 2019, 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, 2021 and 2020 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 CompensationStock-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.
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 tax 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 of applicable laws.
Comprehensive Income	Comprehensive IncomeComprehensive income consists of net income and OCI. OCI includes unrealized gains and losses, net of tax effect, on available-for-sale securities, including transferred debt securities, and derivatives used for cash flow hedges.
Earnings Per Share	Earnings Per ShareBasic 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.
Accounting Guidance Adopted in 2021 and Pending Adoption at December 31, 2021	Accounting Guidance Adopted in 2021The ASC is the 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. There were no ASU’s adopted in 2021 and no recently issued but not effective ASU’s pending adoption at December 31, 2021 that could have a material effect on the Company’s financial position or results of operations.

Nature of Operations and Summ_3

Nature of Operations and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financing receivable, allowance for credit loss	The following table presents the provision for credit losses on the loan portfolio and off-balance sheet exposures: Year ended (Dollars in thousands) December 31, December 31, December 31, Provision for credit loss loans 16,380 37,637 57 Provision for credit loss unfunded 6,696 2,128 — Total provision for credit losses 23,076 39,765 57 Year ended December 31, 2021 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 158,243 9,604 86,999 49,133 8,182 4,325 Acquisitions 371 — 309 62 — — Provision for credit losses 16,380 6,517 28,996 (23,444) 186 4,125 Charge-offs (11,594) (38) (279) (4,826) (45) (6,406) Recoveries 9,265 375 1,876 3,778 243 2,993 Balance at end of period $ 172,665 16,458 117,901 24,703 8,566 5,037 Year ended December 31, 2020 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 124,490 10,111 69,496 36,129 4,937 3,817 Impact of adopting CECL 3,720 3,584 10,533 (13,759) 3,400 (38) Acquisitions 49 — 49 — — — Provision for credit losses 37,637 (4,131) 9,324 29,812 (27) 2,659 Charge-offs (13,808) (21) (3,497) (4,860) (384) (5,046) Recoveries 6,155 61 1,094 1,811 256 2,933 Balance at end of period $ 158,243 9,604 86,999 49,133 8,182 4,325 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 credit 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

Debt Securities (Tables)

Debt Securities (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 Amortized Gross Unrealized Gains Gross Unrealized Losses Fair (Dollars in thousands) Available-for-sale U.S. government and federal agency $ 1,356,171 174 (9,596) 1,346,749 U.S. government sponsored enterprises 241,687 2 (996) 240,693 State and local governments 461,414 27,567 (123) 488,858 Corporate bonds 175,697 5,072 (17) 180,752 Residential mortgage-backed securities 5,744,505 9,420 (54,266) 5,699,659 Commercial mortgage-backed securities 1,195,949 25,882 (7,693) 1,214,138 Total available-for-sale 9,175,423 68,117 (72,691) 9,170,849 Held-to-maturity State and local governments 1,199,164 22,878 (1,159) 1,220,883 Total held-to-maturity 1,199,164 22,878 (1,159) 1,220,883 Total debt securities $ 10,374,587 90,995 (73,850) 10,391,732 December 31, 2020 Amortized Gross Unrealized Gains Gross Unrealized Losses Fair (Dollars in thousands) Available-for-sale U.S. government and federal agency $ 38,568 287 (267) 38,588 U.S. government sponsored enterprises 9,747 34 — 9,781 State and local governments 1,321,763 94,974 (54) 1,416,683 Corporate bonds 336,867 12,239 (8) 349,098 Residential mortgage-backed securities 2,261,463 27,631 (4) 2,289,090 Commercial mortgage-backed securities 1,177,458 57,575 (459) 1,234,574 Total available-for-sale 5,145,866 192,740 (792) 5,337,814 Held-to-maturity State and local governments 189,836 13,380 — 203,216 Total held-to-maturity 189,836 13,380 — 203,216 Total debt securities $ 5,335,702 206,120 (792) 5,541,030
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, 2021. Actual maturities may differ from expected or contractual maturities since some issuers have the right to prepay obligations with or without prepayment penalties. December 31, 2021 Available-for-Sale Held-to-Maturity (Dollars in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 54,460 54,824 1,432 1,445 Due after one year through five years 1,143,487 1,146,529 29,286 30,932 Due after five years through ten years 815,328 816,598 91,688 96,253 Due after ten years 221,694 239,101 1,076,758 1,092,253 2,234,969 2,257,052 1,199,164 1,220,883 Mortgage-backed securities 1 6,940,454 6,913,797 — — Total $ 9,175,423 9,170,849 1,199,164 1,220,883 ______________________________ 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 $ 188,431 240,521 928,710 Gross realized gains 1 984 1,400 18,936 Gross realized losses 1 (194) (262) (4,513) Held-to-maturity Proceeds from calls of debt securities 48,475 32,735 58,750 Gross realized gains 1 3 1 2 Gross realized losses 1 (1,431) — (10) ______________________________ 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	The following table summarizes available-for-sale debt securities that were in an unrealized loss position for which an ACL has not been recorded, based on the length of time the individual securities have been in an unrealized loss position. The number of available-for-sale debt securities in an unrealized position is also disclosed. December 31, 2021 Number 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 50 $ 1,329,399 (9,344) 5,457 (252) 1,334,856 (9,596) U.S. government sponsored enterprises 11 239,928 (996) — — 239,928 (996) State and local governments 10 11,080 (83) 1,760 (40) 12,840 (123) Corporate bonds 3 12,483 (17) — — 12,483 (17) Residential mortgage-backed securities 151 5,335,632 (53,434) 53,045 (832) 5,388,677 (54,266) Commercial mortgage-backed securities 38 302,784 (3,316) 126,798 (4,377) 429,582 (7,693) Total available-for-sale 263 $ 7,231,306 (67,190) 187,060 (5,501) 7,418,366 (72,691) December 31, 2020 Number 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 18 $ 13,814 (258) 726 (9) 14,540 (267) State and local governments 6 3,121 (54) — — 3,121 (54) Corporate bonds 3 5,500 (8) — — 5,500 (8) Residential mortgage-backed securities 14 2,354 (4) 27 — 2,381 (4) Commercial mortgage-backed securities 5 120,741 (459) — — 120,741 (459) Total available-for-sale 46 $ 145,530 (783) 753 (9) 146,283 (792)
Credit quality indictors for HTM debt securities	Allowance for Credit Losses - Held-To-Maturity Debt Securities The Company measured expected credit losses on held-to-maturity debt securities on a collective basis by major security type and NRSRO credit ratings, which is the Company’s primary credit quality indicator for state and local government securities. The estimate of expected credit losses considered historical credit loss information that was adjusted for current conditions as well as reasonable and supportable forecasts. The following table summarizes the amortized cost of held-to-maturity debt securities aggregated by NRSRO credit rating: (Dollars in thousands) December 31, December 31, Held-to-maturity S&P: AAA / Moody’s: Aaa $ 316,899 39,022 S&P: AA+, AA, AA- / Moody’s: Aa1, Aa2, Aa3 841,616 123,664 S&P: A+, A, A- / Moody’s: A1, A2, A3 39,078 27,150 Not rated by either entity 1,571 — Total held-to-maturity $ 1,199,164 189,836

Loans Receivable, Net (Tables)

Loans Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
Summary of loans receivable	The following table presents loans receivable for each portfolio segment of loans: (Dollars in thousands) December 31, December 31, Residential real estate $ 1,051,883 802,508 Commercial real estate 8,630,831 6,315,895 Other commercial 2,664,190 3,054,817 Home equity 736,288 636,405 Other consumer 348,839 313,071 Loans receivable 13,432,031 11,122,696 Allowance for credit losses (172,665) (158,243) Loans receivable, net $ 13,259,366 10,964,453 Net deferred origination (fees) costs included in loans receivable $ (21,667) (26,709) Net purchase accounting (discounts) premiums included in loans receivable $ (25,166) (17,091) Accrued interest receivable on loans $ 49,133 53,538
Financing receivable, allowance for credit loss	The following table presents the provision for credit losses on the loan portfolio and off-balance sheet exposures: Year ended (Dollars in thousands) December 31, December 31, December 31, Provision for credit loss loans 16,380 37,637 57 Provision for credit loss unfunded 6,696 2,128 — Total provision for credit losses 23,076 39,765 57 Year ended December 31, 2021 (Dollars in thousands) Total Residential Real Estate Commercial Real Estate Other Commercial Home Equity Other Consumer Balance at beginning of period $ 158,243 9,604 86,999 49,133 8,182 4,325 Acquisitions 371 — 309 62 — — Provision for credit losses 16,380 6,517 28,996 (23,444) 186 4,125 Charge-offs (11,594) (38) (279) (4,826) (45) (6,406) Recoveries 9,265 375 1,876 3,778 243 2,993 Balance at end of period $ 172,665 16,458 117,901 24,703 8,566 5,037 Year ended December 31, 2020 (Dollars in thousands) Total Residential Commercial Other Home Other Balance at beginning of period $ 124,490 10,111 69,496 36,129 4,937 3,817 Impact of adopting CECL 3,720 3,584 10,533 (13,759) 3,400 (38) Acquisitions 49 — 49 — — — Provision for credit losses 37,637 (4,131) 9,324 29,812 (27) 2,659 Charge-offs (13,808) (21) (3,497) (4,860) (384) (5,046) Recoveries 6,155 61 1,094 1,811 256 2,933 Balance at end of period $ 158,243 9,604 86,999 49,133 8,182 4,325 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 credit 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
Loan portfolio aging analysis	The following tables present an aging analysis of the recorded investment in loans: December 31, 2021 (Dollars in thousands) Total Residential Commercial Other Home Other Accruing loans 30-59 days past due $ 38,081 2,132 26,063 5,464 1,582 2,840 Accruing loans 60-89 days past due 12,485 457 9,537 1,652 512 327 Accruing loans 90 days or more past due 17,141 223 15,345 1,383 57 133 Non-accrual loans with no ACL 28,961 2,162 20,040 4,563 1,712 484 Non-accrual loans with ACL 21,571 255 448 20,765 99 4 Total past due and non-accrual loans 118,239 5,229 71,433 33,827 3,962 3,788 Current loans receivable 13,313,792 1,046,654 8,559,398 2,630,363 732,326 345,051 Total loans receivable $ 13,432,031 1,051,883 8,630,831 2,664,190 736,288 348,839 December 31, 2020 (Dollars in thousands) Total Residential Commercial Other Home Other Accruing loans 30-59 days past due $ 17,123 6,058 3,854 4,039 2,130 1,042 Accruing loans 60-89 days past due 5,598 584 2,299 809 756 1,150 Accruing loans 90 days or more past due 1,725 934 231 293 135 132 Non-accrual loans with no ACL 29,532 3,129 14,030 9,231 2,664 478 Non-accrual loans with ACL 2,432 274 1,787 278 49 44 Total past due and non-accrual loans 56,410 10,979 22,201 14,650 5,734 2,846 Current loans receivable 11,066,286 791,529 6,293,694 3,040,167 630,671 310,225 Total loans receivable $ 11,122,696 802,508 6,315,895 3,054,817 636,405 313,071
Summary of repayment through operation or sale of collateral	The following table presents the amortized cost basis of collateral-dependent loans by collateral type: December 31, 2021 (Dollars in thousands) Total Residential Commercial Other Home Other Business assets $ 25,182 — 57 25,125 — — Residential real estate 4,625 2,369 280 115 1,694 167 Other real estate 32,093 48 30,996 597 116 336 Other 1,525 — — 1,241 — 284 Total $ 63,425 2,417 31,333 27,078 1,810 787 December 31, 2020 (Dollars in thousands) Total Residential Commercial Other Home Other Business assets $ 4,325 — 37 4,288 — — Residential real estate 7,148 3,338 1,043 198 2,513 56 Other real estate 16,127 64 14,738 1,086 200 39 Other 36,855 — — 36,469 — 386 Total $ 64,455 3,402 15,818 42,041 2,713 481
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, 2021 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 12 1 5 3 1 2 Pre-modification recorded balance $ 2,442 210 1,473 554 54 151 Post-modification recorded balance $ 2,442 210 1,473 554 54 151 Year ended December 31, 2020 (Dollars in thousands) Total Residential Commercial Other Home Other TDRs that occurred during the period Number of loans 16 1 10 4 1 — Pre-modification recorded balance $ 14,945 210 13,392 1,304 39 — Post-modification recorded balance $ 14,945 210 13,392 1,304 39 — TDRs that subsequently defaulted Number of loans 1 — 1 — — — Recorded balance $ 145 — 145 — — — 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 — — —
Credit quality indicators for commercial loans	The following tables present the amortized cost in commercial real estate and other commercial loans based on the Company’s internal risk rating. The date of a modification, renewal or extension of a loan is considered for the year of origination if the terms of the loan are as favorable to the Company as the terms are for a comparable loan to other borrowers with similar credit risk. December 31, 2021 (Dollars in thousands) Total Pass Special Mention Substandard Doubtful/ Commercial real estate loans Term loans by origination year 2021 $ 2,679,564 2,677,540 — 2,024 — 2020 1,512,845 1,499,895 — 12,950 — 2019 952,039 919,091 — 32,948 — 2018 808,275 788,292 — 19,983 — 2017 665,733 624,018 — 41,715 — Prior 1,677,875 1,621,819 — 56,030 26 Revolving loans 334,500 332,696 — 1,803 1 Total $ 8,630,831 8,463,351 — 167,453 27 Other commercial loans 1 Term loans by origination year 2021 $ 751,151 746,709 — 4,442 — 2020 429,500 420,547 — 8,952 1 2019 235,591 226,614 — 8,974 3 2018 188,009 179,679 — 8,329 1 2017 209,287 207,509 — 1,775 3 Prior 312,852 297,926 — 14,275 651 Revolving loans 537,800 507,258 — 30,526 16 Total $ 2,664,190 2,586,242 — 77,273 675 ______________________________ 1 Includes PPP loans. December 31, 2020 (Dollars in thousands) Total Pass Special Mention Substandard Doubtful/ Commercial real estate loans Term loans by origination year 2020 $ 1,496,094 1,490,947 — 5,147 — 2019 1,077,461 1,069,503 — 7,958 — 2018 914,506 874,673 — 39,833 — 2017 723,448 696,371 — 27,077 — 2016 496,275 481,392 — 14,883 — Prior 1,488,281 1,450,596 — 37,574 111 Revolving loans 119,830 116,548 — 3,282 — Total $ 6,315,895 6,180,030 — 135,754 111 Other commercial loans 1 Term loans by origination year 2020 $ 1,366,664 1,341,316 19,564 5,784 — 2019 304,430 284,981 12,582 6,864 3 2018 241,222 234,988 — 6,233 1 2017 269,857 264,651 — 5,114 92 2016 179,225 177,164 — 2,056 5 Prior 218,306 206,431 — 11,329 546 Revolving loans 475,113 467,929 54 7,112 18 Total $ 3,054,817 2,977,460 32,200 44,492 665 ______________________________ 1 Includes PPP loans.
Credit quality indicators for RRE and consumer loans	The following tables present the amortized cost in residential real estate, home equity and other consumer loans based on payment performance: December 31, 2021 (Dollars in thousands) Total Performing 30-89 Days Past Due Non-Accrual and 90 Days or More Past Due Residential real estate loans Term loans by origination year 2021 $ 427,814 427,318 496 — 2020 179,395 178,016 1,232 147 2019 66,543 66,470 — 73 2018 51,095 50,816 — 279 2017 42,181 42,005 — 176 Prior 146,299 143,473 861 1,965 Revolving loans 138,556 138,556 — — Total $ 1,051,883 1,046,654 2,589 2,640 Home equity loans Term loans by origination year 2021 $ 871 871 — — 2020 303 303 — — 2019 1,293 1,260 — 33 2018 1,329 1,328 — 1 2017 886 886 — — Prior 11,494 10,589 576 329 Revolving loans 720,112 717,089 1,518 1,505 Total $ 736,288 732,326 2,094 1,868 Other consumer loans Term loans by origination year 2021 $ 151,407 150,910 469 28 2020 80,531 80,072 443 16 2019 37,036 36,647 187 202 2018 19,563 19,268 144 151 2017 8,591 8,506 78 7 Prior 17,763 15,968 1,589 206 Revolving loans 33,948 33,680 257 11 Total $ 348,839 345,051 3,167 621 December 31, 2020 (Dollars in thousands) Total Performing 30-89 Days Past Due Non-Accrual and 90 Days or More Past Due Residential real estate loans Term loans by origination year 2020 $ 208,679 207,432 1,247 — 2019 181,924 179,915 2,009 — 2018 100,273 99,135 556 582 2017 76,394 75,527 867 — 2016 53,819 52,905 87 827 Prior 179,085 174,281 1,876 2,928 Revolving loans 2,334 2,334 — — Total $ 802,508 791,529 6,642 4,337 Home equity loans Term loans by origination year 2020 $ 89 89 — — 2019 807 771 — 36 2018 1,782 1,782 — — 2017 1,452 1,426 26 — 2016 1,016 1,016 — — Prior 14,025 13,042 463 520 Revolving loans 617,234 612,545 2,397 2,292 Total $ 636,405 630,671 2,886 2,848 Other consumer loans Term loans by origination year 2020 $ 131,302 131,098 158 46 2019 66,327 65,921 170 236 2018 42,827 42,557 212 58 2017 16,287 16,202 38 47 2016 10,519 10,409 48 62 Prior 18,692 17,334 1,155 203 Revolving loans 27,117 26,704 411 2 Total $ 313,071 310,225 2,192 654

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 December 31, 2020 Land $ 75,110 56,842 Buildings and construction in progress 292,371 259,389 Furniture, fixtures and equipment 113,650 102,749 Leasehold improvements 14,935 13,364 Accumulated depreciation (173,647) (159,555) Net premises and equipment, excluding ROU assets 322,419 272,789 ROU assets 50,178 52,546 Net premises and equipment $ 372,597 325,335
Lease Summary	The following table summarizes the Company’s leases: December 31, 2021 December 31, 2020 (Dollars in thousands) Finance Operating Finance Operating ROU assets $ 5,995 5,999 Accumulated depreciation (516) (273) Net ROU assets $ 5,479 44,699 5,726 46,820 Lease liabilities $ 5,781 47,901 5,891 49,675 Weighted-average remaining lease term 23 years 16 years 24 years 17 years Weighted-average discount rate 2.6 % 3.4 % 2.6 % 3.4 %
Maturities of Lease Liabilities	Maturities of lease liabilities consist of the following: December 31, 2021 (Dollars in thousands) Finance Operating Maturing within one year $ 266 5,355 Maturing one year through two years 272 4,329 Maturing two years through three years 280 3,982 Maturing three years through four years 285 3,859 Maturing four years through five years 292 3,753 Thereafter 6,443 43,694 Total lease payments 7,838 64,972 Present value of lease payments Short-term 118 1,455 Long-term 5,663 46,446 Total present value of lease payments 5,781 47,901 Difference between lease payments and present value of lease payments $ 2,057 17,071
Components of Lease Expense	The components of lease expense consist of the following: Year ended (Dollars in thousands) December 31, December 31, Finance lease cost Amortization of ROU assets 245 235 Interest on lease liabilities 151 159 Operating lease cost 5,668 4,807 Short-term lease cost 353 331 Variable lease cost 1,018 1,270 Sublease income (42) (12) Total lease expense 7,393 6,790
Supplemental Cash Flow Information	Supplemental cash flow information related to leases is as follows: Year ended December 31, 2021 December 31, 2020 (Dollars in thousands) Finance Operating Finance Operating Cash paid for amounts included in the measurement of lease liabilities Operating cash flows $ 151 3,381 159 2,742 Financing cash flows 110 N/A 93 N/A ______________________________ N/A - Not applicable

Other Intangible Assets and G_2

Other Intangible Assets and Goodwill (Tables)	12 Months Ended
	Dec. 31, 2021
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 $ 95,120 88,099 85,506 Accumulated amortization (42,861) (32,590) (22,220) Net carrying value $ 52,259 55,509 63,286 Aggregate amortization expense $ 10,271 10,370 8,485 Estimated amortization expense for the years ending December 31, 2022 $ 10,658 2023 9,731 2024 8,815 2025 7,611 2026 6,561
Schedule 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 $ 514,013 456,418 289,586 Acquisitions and adjustments 471,380 57,595 166,832 Net carrying value at end of period $ 985,393 514,013 456,418

Loan Servicing (Tables)

Loan Servicing (Tables)	12 Months Ended
	Dec. 31, 2021
Mortgage Banking [Abstract]
Servicing Asset at Amortized Cost	The following schedules disclose the change in the carrying value of mortgage servicing rights that is included in other assets, principal balances of loans serviced and the fair value of mortgage servicing rights: Years ended (Dollars in thousands) December 31, December 31, December 31, Carrying value at beginning of period $ 8,976 1,618 1,545 Acquisitions 1,354 — — Additions 4,435 8,298 325 Amortization (1,926) (940) (252) Carrying value at end of period $ 12,839 8,976 1,618 Principal balances of loans serviced for others $ 1,639,058 1,269,080 185,897 Fair value of servicing rights $ 16,938 12,087 1,763

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2021
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 $ 121,625 90,183 Accrued interest receivable 519 410 Other assets 41,363 40,282 Total assets $ 163,507 130,875 Liabilities Other borrowed funds $ 38,313 27,176 Accrued interest payable 117 53 Other liabilities 164 171 Total liabilities $ 38,594 27,400
Future Unfunded Contingent Commitments	Future unfunded contingent equity commitments related to the Company’s LIHTC investments at December 31, 2021 are as follows: (Dollars in thousands) Amount Years ending December 31, 2022 $ 31,725 2023 26,726 2024 8,927 2025 299 2026 333 Thereafter 854 Total $ 68,864
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, 2021 December 31, 2020 December 31, Amortization expense $ 8,671 7,656 6,289 Tax credits and other tax benefits recognized 12,264 10,382 8,547

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2021
Deposits [Abstract]
Scheduled maturities of time deposits	The scheduled maturities of time deposits are as follows: (Dollars in thousands) Amount Years ending December 31, 2022 $ 717,501 2023 145,828 2024 58,130 2025 69,448 2026 43,465 Thereafter 1,705 $ 1,036,077

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 December 31, 2020 Remaining Contractual Maturity of the Agreements (Dollars in thousands) Overnight and Continuous State and local governments $ — 787,016 Corporate bonds — 217,567 Residential mortgage-backed securities 1,020,794 — Total $ 1,020,794 1,004,583

Subordinated Debentures (Tables

Subordinated Debentures (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 Rate Structure Maturity (Dollars in thousands) Balance Rate Subordinated debentures owed to trust subsidiaries First Company Statutory Trust 2001 $ 3,521 3.432 % 3 month LIBOR plus 3.30% 07/31/2031 First Company Statutory Trust 2003 2,587 3.470 % 3 month LIBOR plus 3.25% 03/26/2033 Glacier Capital Trust II 46,393 2.874 % 3 month LIBOR plus 2.75% 04/07/2034 Citizens (ID) Statutory Trust I 5,155 2.866 % 3 month LIBOR plus 2.65% 06/17/2034 Glacier Capital Trust III 36,083 1.414 % 3 month LIBOR plus 1.29% 04/07/2036 Glacier Capital Trust IV 30,928 1.773 % 3 month LIBOR plus 1.57% 09/15/2036 Bank of the San Juans Bancorporation Trust I 2,041 1.991 % 3 month LIBOR plus 1.82% 03/01/2037 FNB (UT) Statutory Trust I 4,124 3.320 % 3 month LIBOR plus 3.10% 06/26/2033 FNB (UT) Statutory Trust II 1,788 1.923 % 3 month LIBOR plus 1.72% 12/15/2036 Total subordinated debentures owed to trust subsidiaries $ 132,620

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Pre-Tax Gains or Losses	The effect of cash flow hedge accounting on OCI for the periods ending December 31, 2021, 2020, and 2019 was as follows: Years ended (Dollars in thousands) December 31, December 31, December 31, Amount of gain (loss) recognized in OCI $ 901 (472) (7,047) Amount of loss reclassified from OCI to interest expense — — (10,816)

Regulatory Capital (Tables)

Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2021
Banking and Thrift, Interest [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, 2021 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 $ 2,432,364 14.21 % $ 1,369,157 8.00 % N/A N/A Glacier Bank 2,312,775 13.53 % 1,367,488 8.00 % $ 1,709,361 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated 2,136,749 12.49 % 1,026,868 6.00 % N/A N/A Glacier Bank 2,147,660 12.56 % 1,025,616 6.00 % 1,367,488 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated 2,136,749 12.49 % 770,151 4.50 % N/A N/A Glacier Bank 2,147,660 12.56 % 769,212 4.50 % 1,111,084 6.50 % Tier 1 capital (to average assets) Consolidated 2,136,749 8.64 % 989,712 4.00 % N/A N/A Glacier Bank 2,147,660 8.70 % 987,680 4.00 % 1,234,601 5.00 % December 31, 2020 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 $ 1,900,621 14.63 % $ 1,039,094 8.00 % N/A N/A Glacier Bank 1,824,269 14.06 % 1,038,148 8.00 % $ 1,297,686 10.00 % Tier 1 capital (to risk-weighted assets) Consolidated 1,613,066 12.42 % 779,321 6.00 % N/A N/A Glacier Bank 1,674,714 12.91 % 778,611 6.00 % 1,038,148 8.00 % Common Equity Tier 1 (to risk-weighted assets) Consolidated 1,613,066 12.42 % 584,491 4.50 % N/A N/A Glacier Bank 1,674,714 12.91 % 583,959 4.50 % 843,496 6.50 % Tier 1 capital (to average assets) Consolidated 1,613,066 9.12 % 707,823 4.00 % N/A N/A Glacier Bank 1,674,714 9.56 % 700,529 4.00 % 875,662 5.00 % ______________________________ N/A - Not applicable

Stock-based Compensation Plan (

Stock-based Compensation Plan (Tables)	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Activity for restricted stock units	The following table summarizes the restricted stock unit activity for the year ended December 31, 2021: Restricted Weighted- Non-vested at December 31, 2020 188,894 $ 42.81 Granted 148,539 52.01 Vested (104,037) 43.59 Forfeited (7,328) 47.97 Non-vested at December 31, 2021 226,068 48.33
Activity for stock options	Changes in shares granted for stock options for the year ended December 31, 2021 are summarized as follows: Stock Weighted- Outstanding at December 31, 2020 27,037 $ 23.81 Exercised (11,867) 22.35 Forfeited — — Outstanding at December 31, 2021 15,170 24.96 Exercisable at December 31, 2021 15,170 24.96

Other Expenses (Tables)

Other Expenses (Tables)	12 Months Ended
	Dec. 31, 2021
Other Expenses [Abstract]
Schedule of Other Expenses	Other expenses consists of the following: Years ended (Dollars in thousands) December 31, December 31, December 31, Consulting and outside services $ 11,297 11,324 8,276 Mergers and acquisition expenses 9,830 7,812 8,503 Loan expenses 7,438 4,905 4,140 VIE amortization and other expenses 6,323 4,893 4,341 Debit card expenses 5,722 4,947 5,968 Telephone 5,631 5,199 4,827 Business development 5,250 4,645 4,446 Postage 3,681 3,347 3,437 Employee expenses 3,527 2,924 5,138 Printing and supplies 3,334 3,579 3,256 Checking and operating expenses 2,020 4,944 1,757 Accounting and audit fees 1,538 1,895 1,712 Legal fees 1,391 1,658 1,245 (Gain) loss on dispositions of fixed assets (950) 166 686 Other 4,577 4,571 5,043 Total other expenses $ 70,609 66,809 62,775

Federal and State Income Taxes

Federal and State Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
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 $ 51,180 47,775 34,461 State 22,596 20,728 14,545 Total current income tax expense 73,776 68,503 49,006 Deferred 1 Federal (7,151) (5,396) (279) State (1,944) (1,467) (77) Total deferred income tax benefit expense (9,095) (6,863) (356) Total income tax expense $ 64,681 61,640 48,650 ______________________________
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 % 21.0 % State taxes, net of federal income tax benefit 4.7 % 4.6 % 4.4 % Tax-exempt interest income (4.2 %) (4.0 %) (3.7 %) Tax credits (4.8 %) (4.2 %) (4.5 %) Other, net 1.8 % 1.4 % 1.6 % Effective income tax rate 18.5 % 18.8 % 18.8 %
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 credit losses $ 49,375 44,040 Operating lease liabilities 12,103 12,551 Employee benefits 10,868 9,309 Deferred compensation 8,002 7,638 Acquisition fair market value adjustments 6,891 4,398 Net operating loss carryforwards 1,569 1,884 Available-for-sale debt securities 1,156 — Other 2,787 2,262 Total gross deferred tax assets 92,751 82,082 Deferred tax liabilities Depreciation of premises and equipment (15,749) (14,654) Operating lease ROU assets (11,293) (11,830) Transferred debt securities (10,299) — Intangibles (9,760) (14,671) Deferred loan costs (9,264) (8,940) Mortgage servicing rights (3,244) (2,268) Available-for-sale debt securities — (48,505) Other (5,449) (5,074) Total gross deferred tax liabilities (65,058) (105,942) Net deferred tax asset (liability) $ 27,693 (23,860)
Income tax return jurisdictions and years subject to examination	The following schedule summarizes the years that remain subject to examination as of December 31, 2021: Years ended December 31, Federal 2010, 2011, 2012, 2013, 2016, 2017, 2018, 2019, and 2020 Colorado 2010, 2011, 2012, 2016, 2017, 2018, 2019, and 2020 Arizona & California 2016, 2017, 2018, 2019, and 2020 Montana, Idaho, Utah, & North Dakota 2017, 2018, 2019, and 2020 Alabama, Alaska, Arkansas, Connecticut, Florida, Georgia, Indiana, Kentucky, Louisiana, Massachusetts, Michigan, Minnesota, Missouri, New Jersey, New York, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, & Wisconsin 2019 and 2020 Iowa, Illinois, Kansas, Maryland, Mississippi, North Carolina, Ohio, Oregon 2020

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Activity within Accumulated Other Comprehensive Income (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 and Transferred Debt Securities (Losses) Gains on Derivatives Used for Cash Flow Hedges Total Balance at January 1, 2019 $ (6,613) (2,814) (9,427) Other comprehensive income (loss) before reclassifications 57,607 (5,261) 52,346 Reclassification adjustments for 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 Other comprehensive income (loss) before reclassifications 104,067 (353) 103,714 Reclassification adjustments for gains included in net income (loss) (850) — (850) Net current period other comprehensive income (loss) 103,217 (353) 102,864 Balance at December 31, 2020 $ 143,443 (353) 143,090 Other comprehensive (loss) income before reclassifications (113,161) 674 (112,487) Reclassification adjustments for gains and transfers included in net income (590) — (590) Reclassifications adjustments for amortization included in net income for transferred securities (2,654) — (2,654) Net current period other comprehensive (loss) income (116,405) 674 (115,731) Balance at December 31, 2021 $ 27,038 321 27,359

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2021
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 $ 284,757 266,400 210,544 Average outstanding shares - basic 99,313,255 94,883,864 88,255,290 Add: dilutive restricted stock units and stock options 84,995 48,489 130,485 Average outstanding shares - diluted 99,398,250 94,932,353 88,385,775 Basic earnings per share $ 2.87 2.81 2.39 Diluted earnings per share $ 2.86 2.81 2.38 Restricted stock units and stock options excluded from the diluted average outstanding share calculation 1 194 88,240 — ______________________________ 1 Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock unit 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, 2021
Condensed Financial Information Disclosure [Abstract]
Condensed Statements of Financial Condition	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 $ 27,945 41,451 Interest bearing cash deposits 91,361 43,975 Cash and cash equivalents 119,306 85,426 Other assets 22,218 11,823 Investment in subsidiaries 3,188,210 2,369,040 Total assets $ 3,329,734 2,466,289 Liabilities and Stockholders’ Equity Dividends payable $ 11,520 14,717 Subordinated debentures 132,620 139,959 Other liabilities 7,972 4,572 Total liabilities 152,112 159,248 Common stock 1,107 954 Paid-in capital 2,338,814 1,495,053 Retained earnings 810,342 667,944 Accumulated other comprehensive income 27,359 143,090 Total stockholders’ equity 3,177,622 2,307,041 Total liabilities and stockholders’ equity $ 3,329,734 2,466,289
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 $ 207,000 188,000 142,000 Intercompany charges for services 2,654 2,332 20,661 Other income 500 954 513 Total income 210,154 191,286 163,174 Expenses Compensation and employee benefits 6,516 5,646 25,806 Other operating expenses 13,624 10,051 15,118 Total expenses 20,140 15,697 40,924 Income before income tax benefit and equity in undistributed net income of subsidiaries 190,014 175,589 122,250 Income tax benefit 3,407 3,108 4,488 Income before equity in undistributed net income of subsidiaries 193,421 178,697 126,738 Equity in undistributed net income of subsidiaries 91,336 87,703 83,806 Net Income $ 284,757 266,400 210,544 Comprehensive Income $ 169,026 369,264 260,197
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 $ 284,757 266,400 210,544 Adjustments to reconcile net income to net cash provided by operating activities: Subsidiary income in excess of dividends distributed (91,336) (87,703) (83,806) Stock-based compensation, net of tax benefits 1,628 1,216 1,320 Net change in other assets and other liabilities (7,245) (7,222) 1,854 Net cash provided by operating activities 187,804 172,691 129,912 Investing Activities Net additions of premises and equipment (13) (111) (114) Proceeds from sale of marketable equity securities 186 — 89 Equity received from (contributed to) subsidiaries 248 (13,638) (13,485) Net cash provided by (used in) investing activities 421 (13,749) (13,510) Financing Activities Net decrease in other borrowed funds (7,500) — — Cash dividends paid (145,557) (131,263) (124,468) Tax withholding payments for stock-based compensation (1,553) (1,082) (1,293) Proceeds from stock option exercises 265 993 2,896 Net cash used in financing activities (154,345) (131,352) (122,865) Net increase (decrease) in cash, cash equivalents and restricted cash 33,880 27,590 (6,463) Cash, cash equivalents and restricted cash at beginning of period 85,426 57,836 64,299 Cash, cash equivalents and restricted cash at end of period $ 119,306 85,426 57,836

Unaudited Quarterly Financial_2

Unaudited Quarterly Financial Data (Condensed) (Tables)	12 Months Ended
	Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]
Summarized unaudited quarterly financial data	Summarized unaudited quarterly financial data is as follows: Quarters ended 2021 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 161,552 159,956 166,741 192,825 Interest expense 4,740 4,487 4,128 5,203 Net interest income 156,812 155,469 162,613 187,622 Provision for credit losses 48 (5,653) 725 27,956 Net interest income after provision for credit losses 156,764 161,122 161,888 159,666 Non-interest income 40,121 35,522 34,815 34,362 Non-interest expense 96,585 100,082 104,108 134,047 Income before income taxes 100,300 96,562 92,595 59,981 Federal and state income tax expense 19,498 18,935 16,976 9,272 Net income $ 80,802 77,627 75,619 50,709 Basic earnings per share $ 0.85 0.81 0.79 0.46 Diluted earnings per share $ 0.85 0.81 0.79 0.46 Quarters ended 2020 (Dollars in thousands, except per share data) March 31 June 30 September 30 December 31 Interest income $ 142,865 155,404 157,487 171,308 Interest expense 8,496 7,185 6,084 5,550 Net interest income 134,369 148,219 151,403 165,758 Provision for credit losses 19,185 16,929 5,186 (1,535) Net interest income after provision for credit losses 115,184 131,290 146,217 167,293 Non-interest income 33,272 41,224 53,667 44,704 Non-interest expense 95,487 94,764 103,373 111,187 Income before income taxes 52,969 77,750 96,511 100,810 Federal and state income tax expense 9,630 14,306 18,754 18,950 Net income $ 43,339 63,444 77,757 81,860 Basic earnings per share $ 0.46 0.67 0.81 0.86 Diluted earnings per share $ 0.46 0.66 0.81 0.86

Fair Value of Assets and Liab_2

Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2021
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 Quoted Prices Significant Significant Debt securities, available-for-sale U.S. government and federal agency $ 1,346,749 — 1,346,749 — U.S. government sponsored enterprises 240,693 — 240,693 — State and local governments 488,858 — 488,858 — Corporate bonds 180,752 — 180,752 — Residential mortgage-backed securities 5,699,659 — 5,699,659 — Commercial mortgage-backed securities 1,214,138 — 1,214,138 — Loans held for sale, at fair value 60,797 — 60,797 — Interest rate caps 934 — 934 — Interest rate locks 3,008 — 3,008 — Total assets measured at fair value on a recurring basis $ 9,235,588 — 9,235,588 — TBA hedge $ 80 — 80 — Total liabilities measured at fair value on a recurring basis $ 80 — 80 — Fair Value Measurements (Dollars in thousands) Fair Value December 31, 2020 Quoted Prices Significant Significant Debt securities, available-for-sale U.S. government and federal agency $ 38,588 — 38,588 — U.S. government sponsored enterprises 9,781 — 9,781 — State and local governments 1,416,683 — 1,416,683 — Corporate bonds 349,098 — 349,098 — Residential mortgage-backed securities 2,289,090 — 2,289,090 — Commercial mortgage-backed securities 1,234,574 — 1,234,574 — Loans held for sale, at fair value 166,572 — 166,572 — Interest rate caps 201 — 201 — Interest rate locks 8,605 — 8,605 — Total assets measured at fair value on a recurring basis $ 5,513,192 — 5,513,192 — TBA hedge $ 2,056 — 2,056 — Total liabilities measured at fair value on a recurring basis $ 2,056 — 2,056 —
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, 2021 Quoted Prices Significant Significant Collateral-dependent impaired loans, net of ACL 22,036 — — 22,036 Total assets measured at fair value on a non-recurring basis $ 22,036 — — 22,036 Fair Value Measurements (Dollars in thousands) Fair Value December 31, 2020 Quoted Prices Significant Significant Other real estate owned $ 564 — — 564 Collateral-dependent impaired loans, net of ACL 26,749 — — 26,749 Total assets measured at fair value on a non-recurring basis $ 27,313 — — 27,313
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 Collateral-dependent $ 20,934 Cost approach Selling costs 10.0% - 10.0% (10.0%) 1,102 Sales comparison approach Selling costs 5.0% - 10.0% (6.7%) Adjustment to comparables 0.0% - 10.0% (6.0%) $ 22,036 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 $ 564 Sales comparison approach Selling costs 8.0% - 10.0% (9.0%) Collateral-dependent impaired loans, net of ACL $ 144 Cost approach Selling costs 10.0% - 10.0% (10.0%) 25,309 Sales comparison approach Selling Costs 10.0% - 10.0% (0.1%) Adjustment to comparables 0.0% - 100.0% (11.1%) 1,296 Combined approach Selling costs 10.0% - 10.0% (10.0%) Discount rate 8.0% - 8.0% (8.0%) $ 26,749 ______________________________ 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. There have been no significant changes in the valuation techniques during the period ended December 31, 2021. Cash and cash equivalents: fair value is estimated at book value. Debt securities, held-to-maturity: fair value for held-to-maturity debt securities is estimated in the same manner as available-for sale debt securities, which is described above. Loans receivable, net of ACL: The loans were fair valued on an individual basis, with consideration given to the loans' underlying characteristics, including account types, remaining terms and balance, interest rates, past delinquencies, current market rates, etc. The model utilizes a discounted cash flow approach to estimate the fair value of the loans using various assumptions such as prepayment speeds, projected default probabilities, losses given defaults, etc. The discounted cash flow approach models the credit losses directly in the projected cash flows. The model applies various assumptions regarding credit, interest, and prepayment risks for the loans based on loan types, payment types and fixed or variable classifications. Term Deposits: fair value of term deposits is estimated by discounting the future cash flows using rates of similar deposits with similar maturities. The market rates used were obtained from an independent third party based on current rates offered by the Company’s regional competitors. Repurchase agreements and other borrowed funds: fair value of term repurchase agreements and other term borrowings is estimated based on current repurchase rates and borrowing rates currently available to the Company for repurchases and borrowings with similar terms and maturities. The estimated fair value for overnight repurchase agreements and other borrowings is book value. Subordinated debentures: fair value of the subordinated debt is estimated by discounting the estimated future cash flows using current estimated market rates obtained from an independent third party. Off-balance sheet financial instruments: unused lines of credit and letters of credit represent the principal categories of off-balance sheet financial instruments. The fair value of commitments is based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing. The fair value of unused lines of credit and letters of credit is not material; therefore, such commitments are not included in the following tables. Fair Value Measurements (Dollars in thousands) Carrying Amount December 31, 2021 Quoted Prices Significant Significant Financial assets Cash and cash equivalents $ 437,686 437,686 — — Debt securities, held-to-maturity 1,199,164 — 1,220,883 — Loans receivable, net of ACL 13,259,366 — — 13,422,898 Total financial assets $ 14,896,216 437,686 1,220,883 13,422,898 Financial liabilities Term deposits $ 1,036,077 — 1,040,100 — Repurchase agreements and other borrowed funds 1,064,888 — 1,064,888 — Subordinated debentures 132,620 — 131,513 — Total financial liabilities $ 2,233,585 — 2,236,501 — Fair Value Measurements (Dollars in thousands) Carrying Amount December 31, 2020 Quoted Prices Significant Significant Financial assets Cash and cash equivalents $ 633,142 633,142 — — Debt securities, held-to-maturity 189,836 — 203,216 — Loans receivable, net of ACL 10,964,453 — — 11,233,002 Total financial assets $ 11,787,431 633,142 203,216 11,233,002 Financial liabilities Term deposits $ 978,779 — 983,491 — Repurchase agreements and other borrowed funds 1,037,651 — 1,037,651 — Subordinated debentures 139,959 — 123,944 — Total financial liabilities $ 2,156,389 — 2,145,086 —

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2021
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 $ 4,271,583 2,957,259 Letters of credit 120,436 65,361 Total outstanding commitments $ 4,392,019 3,022,620

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2021
Business Combination and Asset Acquisition [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) Alta SBAZ Fair value of consideration transferred Fair value of Company shares issued $ 839,853 112,133 Cash consideration 9 13,721 Total fair value of consideration transferred 839,862 125,854 Recognized amounts of identifiable assets acquired and liabilities assumed Identifiable assets acquired Cash and cash equivalents 1,622,727 57,434 Debt securities 6,658 142,174 Loans receivable, net of ACL 1,901,950 451,653 Core deposit intangible 1 7,021 2,593 Accrued income and other assets 121,926 33,971 Total identifiable assets acquired 3,660,282 687,825 Liabilities assumed Deposits 3,273,819 603,289 Borrowings — 10,904 Accrued expenses and other liabilities 17,981 5,373 Total liabilities assumed 3,291,800 619,566 Total identifiable net assets 368,482 68,259 Goodwill recognized $ 471,380 57,595 ______________________________ 1 The core deposit intangible for each acquisition was determined to have an estimated life of 10 years .
Unaudited Pro Forma Summary of the Acquisitions	The following unaudited pro forma summary presents consolidated information of the Company as if the Alta acquisition had occurred on January 1, 2020: Year ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income 886,370 898,761 Net income 296,940 309,902 Year ended (Dollars in thousands) December 31, December 31, Net interest income and non-interest income 777,869 664,789 Net income 265,289 218,365

Nature of Operations and Summ_4

Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2021USD ($)operatingSegmentbankDivisionreporting_unitquartercomponent	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Property, Plant and Equipment
Number of bank divisions | bankDivision	17
Number of operating segments | operatingSegment	1
Maximum period of original maturity to be included in cash and cash equivalents	3 months
Federal reserve balance or cash on hand required	$ 0
Minimum period past due to consider loans as delinquent	30 days
Minimum period past due to consider loans as non accrual	90 days
Financing receivable, allowance for credit losses, forecasting period | quarter	4
Financing receivable, allowance for credit losses, number of components | component	2
Provision for credit losses on debt securities	$ 0	$ 0	$ 0
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
Revenue from contracts with customers	$ 65,194,000	54,520,000	$ 69,877,000
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%
Minimum Range
Property, Plant and Equipment
Period past due to consider loan as purchased credit-deteriorated loan	90 days
Minimum number of days delinquent to charge off loans	120 days
Number of years for home equity loan origination term	10 years
Period past due to consider loans as delinquent	30 days
Period past due to consider loans as non accrual	90 days
Minimum Range | Office Buildings
Property, Plant and Equipment
Useful life of premises and equipment	15 years
Minimum Range | Furniture, Fixtures and Equipment
Property, Plant and Equipment
Useful life of premises and equipment	3 years
Maximum Range
Property, Plant and Equipment
Number of years for home equity loan origination term	15 years
Period past due to consider loans as delinquent	89 days
Maximum Range | Office Buildings
Property, Plant and Equipment
Useful life of premises and equipment	40 years
Maximum Range | Furniture, Fixtures and Equipment
Property, Plant and Equipment
Useful life of premises and equipment	10 years

Nature of Operations and Summ_5

Nature of Operations and Summary of Significant Accounting Policies - Schedule of Provision For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Provision for credit loss loans									$ 16,380	$ 37,637	$ 57
Provision for credit loss unfunded									6,696	2,128	0
Total provision for credit losses	$ 27,956	$ 725	$ (5,653)	$ 48	$ (1,535)	$ 5,186	$ 16,929	$ 19,185	$ 23,076	$ 39,765	$ 57

Debt Securities - Amortized Cos

Debt Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale
Amortized Cost	$ 9,175,423	$ 5,145,866
Gross Unrealized Gains	68,117	192,740
Gross Unrealized Losses	(72,691)	(792)
Fair Value	9,170,849	5,337,814
Held-to-maturity
Amortized Cost	1,199,164	189,836
Gross Unrealized Gains	22,878	13,380
Gross Unrealized Losses	(1,159)	0
Fair Value	1,220,883	203,216
Total debt securities
Amortized Cost	10,374,587	5,335,702
Gross Unrealized Gains	90,995	206,120
Gross Unrealized Losses	(73,850)	(792)
Fair Value	10,391,732	5,541,030
U.S. government and federal agency
Available-for-sale
Amortized Cost	1,356,171	38,568
Gross Unrealized Gains	174	287
Gross Unrealized Losses	(9,596)	(267)
Fair Value	1,346,749	38,588
U.S. government sponsored enterprises
Available-for-sale
Amortized Cost	241,687	9,747
Gross Unrealized Gains	2	34
Gross Unrealized Losses	(996)	0
Fair Value	240,693	9,781
State and local governments
Available-for-sale
Amortized Cost	461,414	1,321,763
Gross Unrealized Gains	27,567	94,974
Gross Unrealized Losses	(123)	(54)
Fair Value	488,858	1,416,683
Held-to-maturity
Amortized Cost	1,199,164	189,836
Gross Unrealized Gains	22,878	13,380
Gross Unrealized Losses	(1,159)	0
Fair Value	1,220,883	203,216
Corporate bonds
Available-for-sale
Amortized Cost	175,697	336,867
Gross Unrealized Gains	5,072	12,239
Gross Unrealized Losses	(17)	(8)
Fair Value	180,752	349,098
Residential mortgage-backed securities
Available-for-sale
Amortized Cost	5,744,505	2,261,463
Gross Unrealized Gains	9,420	27,631
Gross Unrealized Losses	(54,266)	(4)
Fair Value	5,699,659	2,289,090
Commercial mortgage-backed securities
Available-for-sale
Amortized Cost	1,195,949	1,177,458
Gross Unrealized Gains	25,882	57,575
Gross Unrealized Losses	(7,693)	(459)
Fair Value	$ 1,214,138	$ 1,234,574

Debt Securities - Maturity Sche

Debt Securities - Maturity Schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-Sale, Amortized Cost
Due within one year	$ 54,460
Due after one year through five years	1,143,487
Due after five years through ten years	815,328
Due after ten years	221,694
Total before mortgage-backed securities	2,234,969
Mortgage-backed securities	6,940,454
Amortized Cost	9,175,423	$ 5,145,866
Available-for-Sale, Fair Value
Due within one year	54,824
Due after one year through five years	1,146,529
Due after five years through ten years	816,598
Due after ten years	239,101
Total before mortgage-backed securities	2,257,052
Mortgage-backed securities	6,913,797
Fair Value	9,170,849	5,337,814
Held-to-Maturity, Amortized Cost
Due within one year	1,432
Due after one year through five years	29,286
Due after five years through ten years	91,688
Due after ten years	1,076,758
Total before mortgage-backed securities	1,199,164
Mortgage-backed securities	0
Amortized Cost	1,199,164	189,836
Held-to-Maturity, Fair Value
Due within one year	1,445
Due after one year through five years	30,932
Due after five years through ten years	96,253
Due after ten years	1,092,253
Total before mortgage-backed securities	1,220,883
Mortgage-backed securities	0
Fair Value	$ 1,220,883	$ 203,216

Debt Securities - Gain or Loss

Debt Securities - Gain or Loss on Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale
Proceeds from sales and calls of debt securities	$ 188,431	$ 240,521	$ 928,710
Gross realized gains	984	1,400	18,936
Gross realized losses	(194)	(262)	(4,513)
Held-to-maturity
Proceeds from calls of debt securities	48,475	32,735	58,750
Gross realized gains	3	1	2
Gross realized losses	$ (1,431)	$ 0	$ (10)

Debt Securities - Narrative (De

Debt Securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2021USD ($)security	Dec. 31, 2020USD ($)
Summary of debt securities
Debt securities pledged as collateral	$ 2,687,652,000	$ 2,169,967,000
Severity rate on available-for-sale debt securities in an unrealized loss position	5.00%
Number of credit rating categories, highest | security	4
Debt securities, available-for-sale	$ 9,170,849,000	5,337,814,000
Interest receivable, available-for-sale debt securities	18,788,000	20,215,000
ACL on available-for-sale debt securities	0
Interest receivable, held-to-maturity debt securities	8,737,000	1,728,000
ACL on held-to-maturity debt securities	0
Financial Asset, Past Due
Summary of debt securities
Debt securities, available-for-sale	0	0
Debt securities, held-to-maturity	$ 0	$ 0

Debt Securities - Unrealized Lo

Debt Securities - Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2021USD ($)security	Dec. 31, 2020USD ($)security
Debt Securities
Number of securities | security	263	46
Less than 12 months, fair value	$ 7,231,306	$ 145,530
Less than 12 months, unrealized loss	(67,190)	(783)
12 months or more, fair value	187,060	753
12 months or longer, unrealized loss	(5,501)	(9)
Total, fair value	7,418,366	146,283
Total, unrealized loss	$ (72,691)	$ (792)
U.S. government and federal agency
Debt Securities
Number of securities | security	50	18
Less than 12 months, fair value	$ 1,329,399	$ 13,814
Less than 12 months, unrealized loss	(9,344)	(258)
12 months or more, fair value	5,457	726
12 months or longer, unrealized loss	(252)	(9)
Total, fair value	1,334,856	14,540
Total, unrealized loss	$ (9,596)	$ (267)
U.S. government sponsored enterprises
Debt Securities
Number of securities | security	11
Less than 12 months, fair value	$ 239,928
Less than 12 months, unrealized loss	(996)
12 months or more, fair value	0
12 months or longer, unrealized loss	0
Total, fair value	239,928
Total, unrealized loss	$ (996)
State and local governments
Debt Securities
Number of securities | security	10	6
Less than 12 months, fair value	$ 11,080	$ 3,121
Less than 12 months, unrealized loss	(83)	(54)
12 months or more, fair value	1,760	0
12 months or longer, unrealized loss	(40)	0
Total, fair value	12,840	3,121
Total, unrealized loss	$ (123)	$ (54)
Corporate bonds
Debt Securities
Number of securities | security	3	3
Less than 12 months, fair value	$ 12,483	$ 5,500
Less than 12 months, unrealized loss	(17)	(8)
12 months or more, fair value	0	0
12 months or longer, unrealized loss	0	0
Total, fair value	12,483	5,500
Total, unrealized loss	$ (17)	$ (8)
Residential mortgage-backed securities
Debt Securities
Number of securities | security	151	14
Less than 12 months, fair value	$ 5,335,632	$ 2,354
Less than 12 months, unrealized loss	(53,434)	(4)
12 months or more, fair value	53,045	27
12 months or longer, unrealized loss	(832)	0
Total, fair value	5,388,677	2,381
Total, unrealized loss	$ (54,266)	$ (4)
Commercial mortgage-backed securities
Debt Securities
Number of securities | security	38	5
Less than 12 months, fair value	$ 302,784	$ 120,741
Less than 12 months, unrealized loss	(3,316)	(459)
12 months or more, fair value	126,798	0
12 months or longer, unrealized loss	(4,377)	0
Total, fair value	429,582	120,741
Total, unrealized loss	$ (7,693)	$ (459)

Debt Securities - Credit Qualit

Debt Securities - Credit Quality Indicators for HTM Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	$ 1,199,164	$ 189,836
Moody's, Aaa Rating | Standard & Poor's, AAA Rating | Internal Investment Grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	316,899	39,022
Moody's, Aa1, Aa2 or Aa3 Ratings | Standard & Poor's, AA+, AA or AA- Ratings | Internal Investment Grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	841,616	123,664
Moody's, A1, A2 or A3 Ratings | Standard & Poor's, A+, A or A- Ratings | Internal Investment Grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	39,078	27,150
Moody's, Not Rated | Standard & Poor's, Not Rated | Internal Investment Grade
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	$ 1,571	$ 0

Loans Receivable, Net - Summary

Loans Receivable, Net - Summary of Loans Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of Loans Receivable
Loans receivable	$ 13,432,031	$ 11,122,696
Allowance for credit losses	(172,665)	(158,243)	$ (124,490)	$ (131,239)
Loans receivable, net	13,259,366	10,964,453
Net deferred origination (fees) costs included in loans receivable	(21,667)	(26,709)
Net purchase accounting (discounts) premiums included in loans receivable	(25,166)	(17,091)
Accrued interest receivable on loans	49,133	53,538
Residential Real Estate
Summary of Loans Receivable
Loans receivable	1,051,883	802,508
Allowance for credit losses	(16,458)	(9,604)	(10,111)	(10,631)
Commercial Real Estate
Summary of Loans Receivable
Loans receivable	8,630,831	6,315,895
Allowance for credit losses	(117,901)	(86,999)	(69,496)	(72,448)
Other Commercial
Summary of Loans Receivable
Loans receivable	2,664,190	3,054,817
Allowance for credit losses	(24,703)	(49,133)	(36,129)	(38,160)
Home Equity
Summary of Loans Receivable
Loans receivable	736,288	636,405
Allowance for credit losses	(8,566)	(8,182)	(4,937)	(5,811)
Other Consumer
Summary of Loans Receivable
Loans receivable	348,839	313,071
Allowance for credit losses	$ (5,037)	$ (4,325)	$ (3,817)	$ (4,189)

Loans Receivable, Net - Narrati

Loans Receivable, Net - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans pledged as collateral	$ 7,948,796
Percentage of consolidated stockholders equity exceeding which no borrower had outstanding loans or commitments	10.00%
Notes receivable, related parties	$ 112,127	$ 77,634
Origination of notes receivable from related parties	56,937
Repayment of notes receivable from related parties	22,444
Provision for credit losses	16,380	37,637	$ 57
Nonaccrual interest income reversed	660	832
TDR with pre modification loan balance for which oreo was received	1,628	2,278	2,992
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process	102	548
OREO Secured by Residential Real Estate	0	273
Additional unfunded commitments on TDRs	1,054	817
Charge-offs on TDRs	0	453	$ 709
State Bank of Arizona
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses		4,794
PCD loans acquired		3,401
ACL on PCD loans acquired		49
Discount (premium) on PCD loans		$ 13
Altabank
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	18,056
PCD loans acquired	58,576
ACL on PCD loans acquired	371
Discount (premium) on PCD loans	$ (840)

Loans Receivable, Net - ACL Act

Loans Receivable, Net - ACL Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for loan and lease losses
Balance at beginning of period	$ 158,243	$ 124,490	$ 131,239
Impact of adopting CECL		3,720
Acquisitions	371	49
Provision for credit losses	16,380	37,637	57
Charge-offs	(11,594)	(13,808)	(15,178)
Recoveries	9,265	6,155	8,372
Balance at end of period	172,665	158,243	124,490
Residential Real Estate
Allowance for loan and lease losses
Balance at beginning of period	9,604	10,111	10,631
Impact of adopting CECL		3,584
Acquisitions	0	0
Provision for credit losses	6,517	(4,131)	(163)
Charge-offs	(38)	(21)	(608)
Recoveries	375	61	251
Balance at end of period	16,458	9,604	10,111
Commercial Real Estate
Allowance for loan and lease losses
Balance at beginning of period	86,999	69,496	72,448
Impact of adopting CECL		10,533
Acquisitions	309	49
Provision for credit losses	28,996	9,324	(2,704)
Charge-offs	(279)	(3,497)	(2,460)
Recoveries	1,876	1,094	2,212
Balance at end of period	117,901	86,999	69,496
Other Commercial
Allowance for loan and lease losses
Balance at beginning of period	49,133	36,129	38,160
Impact of adopting CECL		(13,759)
Acquisitions	62	0
Provision for credit losses	(23,444)	29,812	(23)
Charge-offs	(4,826)	(4,860)	(4,189)
Recoveries	3,778	1,811	2,181
Balance at end of period	24,703	49,133	36,129
Home Equity
Allowance for loan and lease losses
Balance at beginning of period	8,182	4,937	5,811
Impact of adopting CECL		3,400
Acquisitions	0	0
Provision for credit losses	186	(27)	(863)
Charge-offs	(45)	(384)	(90)
Recoveries	243	256	79
Balance at end of period	8,566	8,182	4,937
Other Consumer
Allowance for loan and lease losses
Balance at beginning of period	4,325	3,817	4,189
Impact of adopting CECL		(38)
Acquisitions	0	0
Provision for credit losses	4,125	2,659	3,810
Charge-offs	(6,406)	(5,046)	(7,831)
Recoveries	2,993	2,933	3,649
Balance at end of period	$ 5,037	$ 4,325	$ 3,817

Loans Receivable, Net - Aging A

Loans Receivable, Net - Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loan portfolio aging analysis
Loans receivable	$ 13,432,031	$ 11,122,696
Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	38,081	17,123
Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	12,485	5,598
Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	17,141	1,725
Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	118,239	56,410
Non-accrual loans with no ACL	28,961	29,532
Non-accrual loans with ACL	21,571	2,432
Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	13,313,792	11,066,286
Residential Real Estate
Loan portfolio aging analysis
Loans receivable	1,051,883	802,508
Residential Real Estate | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	2,132	6,058
Residential Real Estate | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	457	584
Residential Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	223	934
Residential Real Estate | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	5,229	10,979
Non-accrual loans with no ACL	2,162	3,129
Non-accrual loans with ACL	255	274
Residential Real Estate | Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	1,046,654	791,529
Commercial Real Estate
Loan portfolio aging analysis
Loans receivable	8,630,831	6,315,895
Commercial Real Estate | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	26,063	3,854
Commercial Real Estate | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	9,537	2,299
Commercial Real Estate | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	15,345	231
Commercial Real Estate | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	71,433	22,201
Non-accrual loans with no ACL	20,040	14,030
Non-accrual loans with ACL	448	1,787
Commercial Real Estate | Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	8,559,398	6,293,694
Other Commercial
Loan portfolio aging analysis
Loans receivable	2,664,190	3,054,817
Other Commercial | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	5,464	4,039
Other Commercial | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	1,652	809
Other Commercial | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	1,383	293
Other Commercial | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	33,827	14,650
Non-accrual loans with no ACL	4,563	9,231
Non-accrual loans with ACL	20,765	278
Other Commercial | Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	2,630,363	3,040,167
Home Equity
Loan portfolio aging analysis
Loans receivable	736,288	636,405
Home Equity | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	1,582	2,130
Home Equity | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	512	756
Home Equity | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	57	135
Home Equity | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	3,962	5,734
Non-accrual loans with no ACL	1,712	2,664
Non-accrual loans with ACL	99	49
Home Equity | Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	732,326	630,671
Other Consumer
Loan portfolio aging analysis
Loans receivable	348,839	313,071
Other Consumer | Accruing loans 30-59 days past due
Loan portfolio aging analysis
Loans receivable	2,840	1,042
Other Consumer | Accruing loans 60-89 days past due
Loan portfolio aging analysis
Loans receivable	327	1,150
Other Consumer | Accruing loans 90 days or more past due
Loan portfolio aging analysis
Loans receivable	133	132
Other Consumer | Financial Asset, Past Due
Loan portfolio aging analysis
Loans receivable	3,788	2,846
Non-accrual loans with no ACL	484	478
Non-accrual loans with ACL	4	44
Other Consumer | Financial Asset, Not Past Due
Loan portfolio aging analysis
Loans receivable	$ 345,051	$ 310,225

Loans Receivable, Net - Collate

Loans Receivable, Net - Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	$ 63,425	$ 64,455
Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	2,417	3,402
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	31,333	15,818
Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	27,078	42,041
Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	1,810	2,713
Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	787	481
Business assets
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	25,182	4,325
Business assets | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0	0
Business assets | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	57	37
Business assets | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	25,125	4,288
Business assets | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0	0
Business assets | Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0	0
Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	4,625	7,148
Residential Real Estate | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	2,369	3,338
Residential Real Estate | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	280	1,043
Residential Real Estate | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	115	198
Residential Real Estate | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	1,694	2,513
Residential Real Estate | Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	167	56
Other real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	32,093	16,127
Other real estate | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	48	64
Other real estate | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	30,996	14,738
Other real estate | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	597	1,086
Other real estate | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	116	200
Other real estate | Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	336	39
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	1,525	36,855
Other | Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0	0
Other | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0	0
Other | Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	1,241	36,469
Other | Home Equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	0	0
Other | Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Collateral dependent loans	$ 284	$ 386

Loans Receivable, Net - Trouble

Loans Receivable, Net - Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)Loan	Dec. 31, 2020USD ($)Loan	Dec. 31, 2019USD ($)Loan
TDRs that occurred during the period
Number of loans | Loan	12	16	18
Pre-modification recorded balance	$ 2,442	$ 14,945	$ 18,508
Post-modification recorded balance	$ 2,442	$ 14,945	$ 18,476
TDRs that subsequently defaulted
Number of loans | Loan		1	1
Recorded balance		$ 145	$ 106
Residential Real Estate
TDRs that occurred during the period
Number of loans | Loan	1	1	1
Pre-modification recorded balance	$ 210	$ 210	$ 117
Post-modification recorded balance	$ 210	$ 210	$ 123
TDRs that subsequently defaulted
Number of loans | Loan		0	0
Recorded balance		$ 0	$ 0
Commercial Real Estate
TDRs that occurred during the period
Number of loans | Loan	5	10	6
Pre-modification recorded balance	$ 1,473	$ 13,392	$ 8,524
Post-modification recorded balance	$ 1,473	$ 13,392	$ 8,524
TDRs that subsequently defaulted
Number of loans | Loan		1	1
Recorded balance		$ 145	$ 106
Other Commercial
TDRs that occurred during the period
Number of loans | Loan	3	4	6
Pre-modification recorded balance	$ 554	$ 1,304	$ 9,382
Post-modification recorded balance	$ 554	$ 1,304	$ 9,364
TDRs that subsequently defaulted
Number of loans | Loan		0	0
Recorded balance		$ 0	$ 0
Home Equity
TDRs that occurred during the period
Number of loans | Loan	1	1	2
Pre-modification recorded balance	$ 54	$ 39	$ 214
Post-modification recorded balance	$ 54	$ 39	$ 214
TDRs that subsequently defaulted
Number of loans | Loan		0	0
Recorded balance		$ 0	$ 0
Other Consumer
TDRs that occurred during the period
Number of loans | Loan	2	0	3
Pre-modification recorded balance	$ 151	$ 0	$ 271
Post-modification recorded balance	$ 151	$ 0	$ 251
TDRs that subsequently defaulted
Number of loans | Loan		0	0
Recorded balance		$ 0	$ 0

Loans Receivable, Net - Credit

Loans Receivable, Net - Credit Quality Indicators for Commercial Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 13,432,031	$ 11,122,696
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	2,679,564	1,496,094
One Year Prior	1,512,845	1,077,461
Two Years Prior	952,039	914,506
Three Years Prior	808,275	723,448
Four Years Prior	665,733	496,275
Prior	1,677,875	1,488,281
Revolving loans	334,500	119,830
Total	8,630,831	6,315,895
Commercial Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	2,677,540	1,490,947
One Year Prior	1,499,895	1,069,503
Two Years Prior	919,091	874,673
Three Years Prior	788,292	696,371
Four Years Prior	624,018	481,392
Prior	1,621,819	1,450,596
Revolving loans	332,696	116,548
Total	8,463,351	6,180,030
Commercial Real Estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	0
One Year Prior	0	0
Two Years Prior	0	0
Three Years Prior	0	0
Four Years Prior	0	0
Prior	0	0
Revolving loans	0	0
Total	0	0
Commercial Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	2,024	5,147
One Year Prior	12,950	7,958
Two Years Prior	32,948	39,833
Three Years Prior	19,983	27,077
Four Years Prior	41,715	14,883
Prior	56,030	37,574
Revolving loans	1,803	3,282
Total	167,453	135,754
Commercial Real Estate | Doubtful/ Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	0
One Year Prior	0	0
Two Years Prior	0	0
Three Years Prior	0	0
Four Years Prior	0	0
Prior	26	111
Revolving loans	1	0
Total	27	111
Other Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	751,151	1,366,664
One Year Prior	429,500	304,430
Two Years Prior	235,591	241,222
Three Years Prior	188,009	269,857
Four Years Prior	209,287	179,225
Prior	312,852	218,306
Revolving loans	537,800	475,113
Total	2,664,190	3,054,817
Other Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	746,709	1,341,316
One Year Prior	420,547	284,981
Two Years Prior	226,614	234,988
Three Years Prior	179,679	264,651
Four Years Prior	207,509	177,164
Prior	297,926	206,431
Revolving loans	507,258	467,929
Total	2,586,242	2,977,460
Other Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	19,564
One Year Prior	0	12,582
Two Years Prior	0	0
Three Years Prior	0	0
Four Years Prior	0	0
Prior	0	0
Revolving loans	0	54
Total	0	32,200
Other Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	4,442	5,784
One Year Prior	8,952	6,864
Two Years Prior	8,974	6,233
Three Years Prior	8,329	5,114
Four Years Prior	1,775	2,056
Prior	14,275	11,329
Revolving loans	30,526	7,112
Total	77,273	44,492
Other Commercial | Doubtful/ Loss
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	0
One Year Prior	1	3
Two Years Prior	3	1
Three Years Prior	1	92
Four Years Prior	3	5
Prior	651	546
Revolving loans	16	18
Total	$ 675	$ 665

Notes Receivable, Net - Credit

Notes Receivable, Net - Credit Quality Indicators for RRE and Consumer Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 13,432,031	$ 11,122,696
Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	427,814	208,679
One Year Prior	179,395	181,924
Two Years Prior	66,543	100,273
Three Years Prior	51,095	76,394
Four Years Prior	42,181	53,819
Prior	146,299	179,085
Revolving loans	138,556	2,334
Total	1,051,883	802,508
Residential Real Estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	427,318	207,432
One Year Prior	178,016	179,915
Two Years Prior	66,470	99,135
Three Years Prior	50,816	75,527
Four Years Prior	42,005	52,905
Prior	143,473	174,281
Revolving loans	138,556	2,334
Total	1,046,654	791,529
Residential Real Estate | 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	496	1,247
One Year Prior	1,232	2,009
Two Years Prior	0	556
Three Years Prior	0	867
Four Years Prior	0	87
Prior	861	1,876
Revolving loans	0	0
Total	2,589	6,642
Residential Real Estate | Non-Accrual and 90 Days or More Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	0
One Year Prior	147	0
Two Years Prior	73	582
Three Years Prior	279	0
Four Years Prior	176	827
Prior	1,965	2,928
Revolving loans	0	0
Total	2,640	4,337
Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	871	89
One Year Prior	303	807
Two Years Prior	1,293	1,782
Three Years Prior	1,329	1,452
Four Years Prior	886	1,016
Prior	11,494	14,025
Revolving loans	720,112	617,234
Total	736,288	636,405
Home Equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	871	89
One Year Prior	303	771
Two Years Prior	1,260	1,782
Three Years Prior	1,328	1,426
Four Years Prior	886	1,016
Prior	10,589	13,042
Revolving loans	717,089	612,545
Total	732,326	630,671
Home Equity | 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	0
One Year Prior	0	0
Two Years Prior	0	0
Three Years Prior	0	26
Four Years Prior	0	0
Prior	576	463
Revolving loans	1,518	2,397
Total	2,094	2,886
Home Equity | Non-Accrual and 90 Days or More Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	0	0
One Year Prior	0	36
Two Years Prior	33	0
Three Years Prior	1	0
Four Years Prior	0	0
Prior	329	520
Revolving loans	1,505	2,292
Total	1,868	2,848
Other Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	151,407	131,302
One Year Prior	80,531	66,327
Two Years Prior	37,036	42,827
Three Years Prior	19,563	16,287
Four Years Prior	8,591	10,519
Prior	17,763	18,692
Revolving loans	33,948	27,117
Total	348,839	313,071
Other Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	150,910	131,098
One Year Prior	80,072	65,921
Two Years Prior	36,647	42,557
Three Years Prior	19,268	16,202
Four Years Prior	8,506	10,409
Prior	15,968	17,334
Revolving loans	33,680	26,704
Total	345,051	310,225
Other Consumer | 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	469	158
One Year Prior	443	170
Two Years Prior	187	212
Three Years Prior	144	38
Four Years Prior	78	48
Prior	1,589	1,155
Revolving loans	257	411
Total	3,167	2,192
Other Consumer | Non-Accrual and 90 Days or More Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Current Year	28	46
One Year Prior	16	236
Two Years Prior	202	58
Three Years Prior	151	47
Four Years Prior	7	62
Prior	206	203
Revolving loans	11	2
Total	$ 621	$ 654

Premises and Equipment - Net of

Premises and Equipment - Net of Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Premises and Equipment, Net of Accumulated Depreciation
Accumulated depreciation	$ (173,647)	$ (159,555)
Net premises and equipment, excluding ROU assets	322,419	272,789
ROU assets	50,178	52,546
Net premises and equipment	372,597	325,335
Land
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	75,110	56,842
Buildings and construction in progress
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	292,371	259,389
Furniture, Fixtures and Equipment
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	113,650	102,749
Leasehold improvements
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	$ 14,935	$ 13,364

Premises and Equipment - Lease

Premises and Equipment - Lease Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Finance lease, ROU assets	$ 5,995	$ 5,999
Finance lease, accumulated depreciation	$ (516)	$ (273)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, Plant, And Equipment And Lease Right Of Use Asset, After Accumulated Depreciation And Amortization	Property, Plant, And Equipment And Lease Right Of Use Asset, After Accumulated Depreciation And Amortization
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, Plant, And Equipment And Lease Right Of Use Asset, After Accumulated Depreciation And Amortization	Property, Plant, And Equipment And Lease Right Of Use Asset, After Accumulated Depreciation And Amortization
Finance lease, net ROU assets	$ 5,479	$ 5,726
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Finance lease, lease liabilities	$ 5,781	$ 5,891
Finance lease, weighted-average remaining lease term	23 years	24 years
Finance lease, weighted-average discount rate	2.60%	2.60%
Operating lease, net ROU assets	$ 44,699	$ 46,820
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities	Other Liabilities
Operating lease, lease liabilities	$ 47,901	$ 49,675
Operating lease, weighted-average remaining lease term (in years)	16 years	17 years
Operating lease, weighted-average discount rate	3.40%	3.40%

Premises and Equipment - Maturi

Premises and Equipment - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finance Leases
Maturing within one year	$ 266
Maturing one year through two years	272
Maturing two years through three years	280
Maturing three years through four years	285
Maturing four years through five years	292
Thereafter	6,443
Total lease payments	7,838
Present value of lease payments
Short-term	118
Long-term	5,663
Total present value of lease payments	5,781	$ 5,891
Difference between lease payments and present value of lease payments	2,057
Operating Leases
Maturing within one year	5,355
Maturing one year through two years	4,329
Maturing two years through three years	3,982
Maturing three years through four years	3,859
Maturing four years through five years	3,753
Thereafter	43,694
Total lease payments	64,972
Present value of lease payments
Short-term	1,455
Long-term	46,446
Total present value of lease payments	47,901	$ 49,675
Difference between lease payments and present value of lease payments	$ 17,071

Premises and Equipment - Compon

Premises and Equipment - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finance lease cost
Amortization of ROU assets	$ 245	$ 235
Interest on lease liabilities	151	159
Operating lease cost	5,668	4,807
Short-term lease cost	353	331
Variable lease cost	1,018	1,270
Sublease income	(42)	(12)
Total lease expense	$ 7,393	$ 6,790

Premises and Equipment - Supple

Premises and Equipment - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Finance lease, operating cash flows	$ 151	$ 159
Finance lease, financing cash flows	110	93
Operating lease, operating cash flows	$ 3,381	$ 2,742

Other Intangible Assets and G_3

Other Intangible Assets and Goodwill - Net Carrying Value of Core Deposit Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Core Deposit Intangibles and Aggregate Amortization Expense
Net carrying value	$ 52,259	$ 55,509
Aggregate amortization expense	10,271	10,370	$ 8,485
Core Deposits Intangibles
Net Core Deposit Intangibles and Aggregate Amortization Expense
Gross carrying value	95,120	88,099	85,506
Accumulated amortization	(42,861)	(32,590)	(22,220)
Net carrying value	52,259	55,509	63,286
Aggregate amortization expense	10,271	$ 10,370	$ 8,485
Estimated Amortization Expense
2022	10,658
2023	9,731
2024	8,815
2025	7,611
2026	$ 6,561

Other Intangible Assets and G_4

Other Intangible Assets and Goodwill - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets
Accumulated impairment charge	$ 40,159	$ 40,159
Core Deposits Intangibles
Finite-Lived Intangible Assets
Core deposit intangibles	$ 7,021	$ 2,593	$ 22,529

Other Intangible Assets and G_5

Other Intangible Assets and Goodwill - Changes in the Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill Roll Forward
Net carrying value at beginning of period	$ 514,013	$ 456,418	$ 289,586
Acquisitions and adjustments	471,380	57,595	166,832
Net carrying value at end of period	$ 985,393	$ 514,013	$ 456,418

Loan Servicing (Details)

Loan Servicing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Carrying value at beginning of period	$ 12,839	$ 8,976	$ 1,618	$ 1,545
Acquisitions	1,354	0	0
Additions	4,435	8,298	325
Amortization	(1,926)	(940)	(252)
Carrying value at end of period	12,839	8,976	1,618
Principal balances of loans serviced for others	1,639,058	1,269,080	185,897
Fair value of servicing rights	$ 16,938	$ 12,087	$ 1,763

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Certified Development Entities
Variable Interest Entities
Tax credit period	7 years
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Tax credit period	10 years
Tax credit compliance period	15 years
Impairment losses	$ 0	$ 0	$ 0
Other assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Carrying value of equity investments in LIHTCs	$ 50,725,000	$ 45,953,000

Variable Interest Entities - VI

Variable Interest Entities - VIE Carrying Amounts Included in Financial Statements (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Loans receivable	$ 13,259,366	$ 10,964,453
Accrued interest receivable	76,673	75,497
Other assets	120,459	106,505
Total assets	25,940,645	18,504,206
Liabilities
Other borrowed funds	44,094	33,068
Accrued interest payable	2,409	3,305
Other liabilities	225,857	194,861
Total liabilities	22,763,023	16,197,165
Consolidated VIEs
Assets
Loans receivable	121,625	90,183
Accrued interest receivable	519	410
Other assets	41,363	40,282
Total assets	163,507	130,875
Liabilities
Other borrowed funds	38,313	27,176
Accrued interest payable	117	53
Other liabilities	164	171
Total liabilities	$ 38,594	$ 27,400

Variable Interest Entities - Fu

Variable Interest Entities - Future Unfunded Contingent Commitments (Details) - Variable Interest Entity, Not Primary Beneficiary $ in Thousands	Dec. 31, 2021USD ($)
Investments in Qualified Affordable Housing Projects
2022	$ 31,725
2023	26,726
2024	8,927
2025	299
2026	333
Thereafter	854
Total	$ 68,864

Variable Interest Entities - Am

Variable Interest Entities - Amortization Expense and Tax Credits and Other Tax Benefits (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments in Qualified Affordable Housing Projects
Amortization expense	$ 8,671	$ 7,656	$ 6,289
Tax credits and other tax benefits recognized	$ 12,264	$ 10,382	$ 8,547

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Deposits
FDIC Insurance limit	$ 250,000
Time deposits that meet or exceed FDIC Insurance limit	298,512,000	$ 297,975,000
Overdraft demand deposits reclassified as loans	10,036,000	4,713,000
Deposits with related parties	$ 55,966,000	$ 45,179,000

Deposits - Scheduled Maturities

Deposits - Scheduled Maturities of Time Deposits (Details) $ in Thousands	Dec. 31, 2021USD ($)
Maturities of Time Deposits
2022	$ 717,501
2023	145,828
2024	58,130
2025	69,448
2026	43,465
Thereafter	1,705
Total	$ 1,036,077

Borrowings - Additional Informa

Borrowings - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Repurchase agreements	$ 1,020,794	$ 1,004,583
Securities pledged for repurchase agreements	1,233,885	$ 1,151,264
Loss on early payment of FHLB advances	(3,531)
Lines of credit	$ 635,000

Borrowings - Summary of Repurch

Borrowings - Summary of Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Securities Sold Under Agreements to Repurchase
Repurchase agreements	$ 1,020,794	$ 1,004,583
Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase agreements	1,020,794	1,004,583
State and local governments | Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase agreements	0	787,016
Corporate bonds | Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase agreements	0	217,567
Residential mortgage-backed securities | Overnight and Continuous
Securities Sold Under Agreements to Repurchase
Repurchase agreements	$ 1,020,794	$ 0

Subordinated Debentures - Sched

Subordinated Debentures - Schedule of Subordinated Debentures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Terms of Subordinated Debentures
Balance	$ 132,620	$ 139,959
Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	132,620
First Company Statutory Trust 2001 | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 3,521
Rate	3.432%
Rate Structure	3.30%
First Company Statutory Trust 2003 | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 2,587
Rate	3.47%
Rate Structure	3.25%
Glacier Capital Trust II | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 46,393
Rate	2.874%
Rate Structure	2.75%
Citizens (ID) Statutory Trust I | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 5,155
Rate	2.866%
Rate Structure	2.65%
Glacier Capital Trust III | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 36,083
Rate	1.414%
Rate Structure	1.29%
Glacier Capital Trust IV | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 30,928
Rate	1.773%
Rate Structure	1.57%
Bank of the San Juans Bancorporation Trust I | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 2,041
Rate	1.991%
Rate Structure	1.82%
FNB (UT) Statutory Trust I | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 4,124
Rate	3.32%
Rate Structure	3.10%
FNB (UT) Statutory Trust II | Subordinated debentures owed to trust subsidiaries
Terms of Subordinated Debentures
Balance	$ 1,788
Rate	1.923%
Rate Structure	1.72%

Subordinated Debentures - Narra

Subordinated Debentures - Narrative (Details)	12 Months Ended
	Dec. 31, 2021USD ($)quarter	Dec. 31, 2020USD ($)
Debt Instruments [Abstract]
Maximum number of consecutive quarters for deferral of interest payments on trust preferred securities | quarter	20
Size of company eligible for Tier 1 grandfather provision | $	$ 15,000,000,000	$ 15,000,000,000
Number of years before allowed to prepay Tier 2 subordinated debt	5 years

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest rate locks
Interest rate swap derivative financial instruments
Off-balance sheet commitments			$ 151,038	$ 229,862
Interest rate locks | Prepaid Expenses and Other Current Assets
Interest rate swap derivative financial instruments
Gross amounts of recognized assets			3,008	8,605
Interest rate caps
Interest rate swap derivative financial instruments
Forecasted notional amount	$ 130,500
Derivative, term of contract	5 years
Interest rate expense recorded on interest rate swap			168	126
Interest rate caps | Prepaid Expenses and Other Current Assets
Interest rate swap derivative financial instruments
Gross amounts of recognized assets			934	201
Interest rate caps | Minimum Range
Interest rate swap derivative financial instruments
Derivative, cap interest rate	1.50%
Interest rate caps | Maximum Range
Interest rate swap derivative financial instruments
Derivative, cap interest rate	2.00%
TBA hedge
Interest rate swap derivative financial instruments
Forecasted notional amount		$ 260,000
Interest rate expense recorded on interest rate swap			0	0	$ 5,532
Loss on termination of interest rate swaps		$ 9,997
Forward commitments to sell TBA securities
Interest rate swap derivative financial instruments
Forecasted notional amount			116,500	206,000
Forward commitments to sell TBA securities | Other Liabilities
Interest rate swap derivative financial instruments
Derivative asset, fair value, gross liability			$ 80	$ 2,056

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Interest Rate Swap Gains or Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pre-Tax Gains or Losses
Amount of gain (loss) recognized in OCI	$ 901	$ (472)	$ (7,047)
Amount of loss reclassified from OCI to interest expense	0	0	(10,816)
TBA hedge
Pre-Tax Gains or Losses
Amount of gain (loss) recognized in OCI	901	(472)	(7,047)
Amount of loss reclassified from OCI to interest expense	$ 0	$ 0	$ (10,816)

Regulatory Capital (Details)

Regulatory Capital (Details) $ in Thousands	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Regulatory Capital
Capital conservation buffer	2.50%
Total capital (to risk-weighted assets)
Actual, amount	$ 2,432,364	$ 1,900,621
Actual, ratio	0.1421	0.1463
Minimum capital requirement, amount	$ 1,369,157	$ 1,039,094
Minimum capital requirement, ratio	0.0800	0.0800
Tier 1 capital (to risk-weighted assets)
Actual, amount	$ 2,136,749	$ 1,613,066
Actual, ratio	0.1249	0.1242
Minimum capital requirement, amount	$ 1,026,868	$ 779,321
Minimum capital requirement, ratio	0.0600	0.0600
Common Equity Tier 1 (to risk-weighted assets)
Actual, amount	$ 2,136,749	$ 1,613,066
Actual, ratio	0.1249	0.1242
Minimum capital requirement, amount	$ 770,151	$ 584,491
Minimum capital requirement, ratio	4.50%	4.50%
Tier 1 capital (to average assets)
Actual, amount	$ 2,136,749	$ 1,613,066
Actual, ratio	0.0864	0.0912
Minimum capital requirement, amount	$ 989,712	$ 707,823
Minimum capital requirement, ratio	0.0400	0.0400
Glacier Bank
Total capital (to risk-weighted assets)
Actual, amount	$ 2,312,775	$ 1,824,269
Actual, ratio	0.1353	0.1406
Minimum capital requirement, amount	$ 1,367,488	$ 1,038,148
Minimum capital requirement, ratio	0.0800	0.0800
Well capitalized requirement, amount	$ 1,709,361	$ 1,297,686
Well capitalized requirement, ratio	0.1000	0.1000
Tier 1 capital (to risk-weighted assets)
Actual, amount	$ 2,147,660	$ 1,674,714
Actual, ratio	0.1256	0.1291
Minimum capital requirement, amount	$ 1,025,616	$ 778,611
Minimum capital requirement, ratio	0.0600	0.0600
Well capitalized requirement, amount	$ 1,367,488	$ 1,038,148
Well capitalized requirement, ratio	0.0800	0.0800
Common Equity Tier 1 (to risk-weighted assets)
Actual, amount	$ 2,147,660	$ 1,674,714
Actual, ratio	0.1256	0.1291
Minimum capital requirement, amount	$ 769,212	$ 583,959
Minimum capital requirement, ratio	4.50%	4.50%
Well capitalized requirement, amount	$ 1,111,084	$ 843,496
Well capitalized requirement, ratio	6.50%	6.50%
Tier 1 capital (to average assets)
Actual, amount	$ 2,147,660	$ 1,674,714
Actual, ratio	0.0870	0.0956
Minimum capital requirement, amount	$ 987,680	$ 700,529
Minimum capital requirement, ratio	0.0400	0.0400
Well capitalized requirement, amount	$ 1,234,601	$ 875,662
Well capitalized requirement, ratio	0.0500	0.0500

Stock-based Compensation Plan -

Stock-based Compensation Plan - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock-based Compensation Plans
Shares available to grant to employees and directors (in shares)	1,788,367
Stock Options
Unrecognized compensation expense	$ 0
Total intrinsic value of options exercised	339,000	$ 1,221,000	$ 4,491,000
Total intrinsic value of options exercised, tax benefit	0	141,000
Proceeds from stock option exercises	$ 265,000	993,000	2,896,000
Average remaining contractual term on outstanding stock options	4 years 8 months 12 days
Aggregate intrinsic value of outstanding stock options	$ 482,000
Restricted Stock Units
Stock-based Compensation Plans
Compensation expense related to stock-based compensation plans	5,342,000	4,489,000	3,803,000
Income tax benefit related to compensation expense	1,350,000	1,134,000	964,000
Unrecognized compensation expense	$ 6,865,000
Unrecognized compensation expense, recognized over weighted-average period	2 years
Restricted Stock Units
Fair value of units that vested	$ 4,535,000	4,048,000	3,536,000
Tax benefit of units that vested	$ 1,369,000	1,089,000	1,124,000
Average remaining contractual term on non-vested units	1 year
Aggregate intrinsic value of non-vested units	$ 12,818,000
Stock Options
Stock-based Compensation Plans
Compensation expense related to stock-based compensation plans	6,000	17,000	5,415,000
Income tax benefit related to compensation expense	$ 2,000	$ 4,000	$ 1,372,000

Stock-based Compensation Plan_2

Stock-based Compensation Plan - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units	12 Months Ended
	Dec. 31, 2021$ / sharesshares
Restricted Stock Units
Beginning balance (in shares) | shares	188,894
Granted (in shares) | shares	148,539
Vested (in shares) | shares	(104,037)
Forfeited (in shares) | shares	(7,328)
Ending balance (in shares) | shares	226,068
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 42.81
Granted (in dollars per share) | $ / shares	52.01
Vested (in dollars per share) | $ / shares	43.59
Forfeited (in dollars per share) | $ / shares	47.97
Ending balance (in dollars per share) | $ / shares	$ 48.33

Stock-based Compensation Plan_3

Stock-based Compensation Plan - Summary of Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2021$ / sharesshares
Stock Options
Beginning balance (in shares) | shares	27,037
Exercised (in shares) | shares	(11,867)
Forfeited (in shares) | shares	0
Ending balance (in shares) | shares	15,170
Exercisable (in shares) | shares	15,170
Weighted- Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 23.81
Exercised (in dollars per share) | $ / shares	22.35
Forfeited (in dollars per share) | $ / shares	0
Ending balance (in dollars per share) | $ / shares	24.96
Exercisable (in dollars per share) | $ / shares	$ 24.96

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)quarteryearhour	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
401(k) and Profit Sharing Plan
401(k) and Profit Sharing Plans
Minimum age required to be considered eligible for plan | year	18
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	$ 20,421	$ 22,047	$ 17,227
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	$ 5,267	4,985	4,236
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	$ 470	504	480
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	$ 8,861	9,276
Total amount deferred	$ 1,137	1,109	766
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	$ 1,094	971	992
Liability related to obligations of deferred compensation plans	18,560	17,321
Supplemental Employee Retirement Plan
401(k) and Profit Sharing Plans
Cost of plan	164	199	120
Company's contribution to the plan	858	910	$ 662
Liability related to obligations of deferred compensation plans	$ 3,974	$ 3,375
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, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Expenses
Consulting and outside services	$ 11,297	$ 11,324	$ 8,276
Mergers and acquisition expenses	9,830	7,812	8,503
Loan expenses	7,438	4,905	4,140
VIE amortization and other expenses	6,323	4,893	4,341
Debit card expenses	5,722	4,947	5,968
Telephone	5,631	5,199	4,827
Business development	5,250	4,645	4,446
Postage	3,681	3,347	3,437
Employee expenses	3,527	2,924	5,138
Printing and supplies	3,334	3,579	3,256
Checking and operating expenses	2,020	4,944	1,757
Accounting and audit fees	1,538	1,895	1,712
Legal fees	1,391	1,658	1,245
(Gain) loss on dispositions of fixed assets	(950)	166	686
Other	4,577	4,571	5,043
Total other expenses	$ 70,609	$ 66,809	$ 62,775

Federal and State Income Taxe_2

Federal and State Income Taxes - Summary of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current
Federal									$ 51,180	$ 47,775	$ 34,461
State									22,596	20,728	14,545
Total current income tax expense									73,776	68,503	49,006
Deferred
Federal									(7,151)	(5,396)	(279)
State									(1,944)	(1,467)	(77)
Total deferred income tax benefit expense									(9,095)	(6,863)	(356)
Total income tax expense	$ 9,272	$ 16,976	$ 18,935	$ 19,498	$ 18,950	$ 18,754	$ 14,306	$ 9,630	64,681	61,640	48,650
Tax benefit of operating loss carryforwards									$ 315	$ 315	$ 317

Federal and State Income Taxe_3

Federal and State Income Taxes - Summary of Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective income tax rate reconciliation
Federal statutory rate	21.00%	21.00%	21.00%
State taxes, net of federal income tax benefit	4.70%	4.60%	4.40%
Tax-exempt interest income	(4.20%)	(4.00%)	(3.70%)
Tax credits	(4.80%)	(4.20%)	(4.50%)
Other, net	1.80%	1.40%	1.60%
Effective income tax rate	18.50%	18.80%	18.80%

Federal and State Income Taxe_4

Federal and State Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Allowance for credit losses	$ 49,375	$ 44,040
Operating lease liabilities	12,103	12,551
Employee benefits	10,868	9,309
Deferred compensation	8,002	7,638
Acquisition fair market value adjustments	6,891	4,398
Net operating loss carryforwards	1,569	1,884
Available-for-sale debt securities	1,156	0
Other	2,787	2,262
Total gross deferred tax assets	92,751	82,082
Deferred tax liabilities
Depreciation of premises and equipment	(15,749)	(14,654)
Operating lease ROU assets	(11,293)	(11,830)
Transferred debt securities	(10,299)	0
Intangibles	(9,760)	(14,671)
Deferred loan costs	(9,264)	(8,940)
Mortgage servicing rights	(3,244)	(2,268)
Available-for-sale debt securities	0	(48,505)
Other	(5,449)	(5,074)
Total gross deferred tax liabilities	(65,058)	(105,942)
Net deferred tax asset (liability)	$ 27,693
Net deferred tax asset (liability)		$ (23,860)

Federal and State Income Taxe_5

Federal and State Income Taxes - Narrative (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Operating Loss and Tax Credit Carryforwards
Unrecognized tax benefits	$ 0	$ 0
Income tax penalties and interest accrued	0	0
Deferred tax assets, valuation allowance	0	$ 0
Federal
Operating Loss and Tax Credit Carryforwards
Operating loss carryforwards, amount	5,440,000
Colorado
Operating Loss and Tax Credit Carryforwards
Operating loss carryforwards, amount	$ 9,990,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 2,307,041	$ 1,960,733	$ 1,515,854
Other comprehensive income (loss) before reclassifications	(112,487)	103,714	52,346
Reclassification adjustments for gains included in net income (loss)		(850)	(2,693)
Total other comprehensive (loss) income, net of tax	(115,731)	102,864	49,653
Balance	3,177,622	2,307,041	1,960,733
Gains (Losses) on Available-For-Sale and Transferred Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	143,443	40,226	(6,613)
Other comprehensive income (loss) before reclassifications	(113,161)	104,067	57,607
Reclassification adjustments for gains included in net income (loss)		(850)	(10,768)
Total other comprehensive (loss) income, net of tax	(116,405)	103,217	46,839
Balance	27,038	143,443	40,226
(Losses) Gains on Derivatives Used for Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(353)	0	(2,814)
Other comprehensive income (loss) before reclassifications	674	(353)	(5,261)
Reclassification adjustments for gains included in net income (loss)	0	0	8,075
Total other comprehensive (loss) income, net of tax	674	(353)	2,814
Balance	321	(353)	0
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	143,090	40,226	(9,427)
Total other comprehensive (loss) income, net of tax	(115,731)	102,864	49,653
Balance	27,359	$ 143,090	$ 40,226
Reclassification adjustments for gains and transfers included in net income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification adjustments for gains included in net income (loss)	(590)
Reclassifications adjustments for amortization included in net income for transferred securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification adjustments for gains included in net income (loss)	$ (2,654)

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic and Diluted Earnings Per Share
Net income available to common stockholders, basic									$ 284,757	$ 266,400	$ 210,544
Net income available to common stockholders, diluted									$ 284,757	$ 266,400	$ 210,544
Average outstanding shares - basic (in shares)									99,313,255	94,883,864	88,255,290
Add: dilutive restricted stock units and stock options (in shares)									84,995	48,489	130,485
Average outstanding shares - diluted (in shares)									99,398,250	94,932,353	88,385,775
Basic earnings per share (in dollars per share)	$ 0.46	$ 0.79	$ 0.81	$ 0.85	$ 0.86	$ 0.81	$ 0.67	$ 0.46	$ 2.87	$ 2.81	$ 2.39
Diluted earnings per share (in dollars per share)	$ 0.46	$ 0.79	$ 0.81	$ 0.85	$ 0.86	$ 0.81	$ 0.66	$ 0.46	$ 2.86	$ 2.81	$ 2.38
Restricted stock units and stock options excluded from the diluted average outstanding share calculation (in shares)									194	88,240	0

Parent Holding Company Inform_3

Parent Holding Company Information (Condensed) - Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash on hand and in banks	$ 198,087	$ 227,108
Interest bearing cash deposits	239,599	406,034
Cash and cash equivalents	437,686	633,142
Other assets	120,459	106,505
Total assets	25,940,645	18,504,206
Liabilities and Stockholders’ Equity
Subordinated debentures	132,620	139,959
Other liabilities	225,857	194,861
Total liabilities	22,763,023	16,197,165
Common stock	1,107	954
Paid-in capital	2,338,814	1,495,053
Retained earnings	810,342	667,944
Accumulated other comprehensive income	27,359	143,090
Total stockholders’ equity	3,177,622	2,307,041	$ 1,960,733	$ 1,515,854
Total liabilities and stockholders’ equity	25,940,645	18,504,206
Parent Company
Assets
Cash on hand and in banks	27,945	41,451
Interest bearing cash deposits	91,361	43,975
Cash and cash equivalents	119,306	85,426
Other assets	22,218	11,823
Investment in subsidiaries	3,188,210	2,369,040
Total assets	3,329,734	2,466,289
Liabilities and Stockholders’ Equity
Dividends payable	11,520	14,717
Subordinated debentures	132,620	139,959
Other liabilities	7,972	4,572
Total liabilities	152,112	159,248
Common stock	1,107	954
Paid-in capital	2,338,814	1,495,053
Retained earnings	810,342	667,944
Accumulated other comprehensive income	27,359	143,090
Total stockholders’ equity	3,177,622	2,307,041
Total liabilities and stockholders’ equity	$ 3,329,734	$ 2,466,289

Parent Holding Company Inform_4

Parent Holding Company Information (Condensed) - Condensed Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Expenses
Compensation and employee benefits									$ 270,644	$ 253,047	$ 222,753
Other operating expenses									70,609	66,809	62,775
Total non-interest expense	$ 134,047	$ 104,108	$ 100,082	$ 96,585	$ 111,187	$ 103,373	$ 94,764	$ 95,487	434,822	404,811	374,927
Income tax benefit	(9,272)	(16,976)	(18,935)	(19,498)	(18,950)	(18,754)	(14,306)	(9,630)	(64,681)	(61,640)	(48,650)
Net Income	$ 50,709	$ 75,619	$ 77,627	$ 80,802	$ 81,860	$ 77,757	$ 63,444	$ 43,339	284,757	266,400	210,544
Comprehensive Income									169,026	369,264	260,197
Parent Company
Income
Dividends from subsidiaries									207,000	188,000	142,000
Intercompany charges for services									2,654	2,332	20,661
Other income									500	954	513
Total income									210,154	191,286	163,174
Expenses
Compensation and employee benefits									6,516	5,646	25,806
Other operating expenses									13,624	10,051	15,118
Total non-interest expense									20,140	15,697	40,924
Income before income tax benefit and equity in undistributed net income of subsidiaries									190,014	175,589	122,250
Income tax benefit									3,407	3,108	4,488
Income before equity in undistributed net income of subsidiaries									193,421	178,697	126,738
Equity in undistributed net income of subsidiaries									91,336	87,703	83,806
Net Income									284,757	266,400	210,544
Comprehensive Income									$ 169,026	$ 369,264	$ 260,197

Parent Holding Company Inform_5

Parent Holding Company Information (Condensed) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income	$ 50,709	$ 75,619	$ 77,627	$ 80,802	$ 81,860	$ 77,757	$ 63,444	$ 43,339	$ 284,757	$ 266,400	$ 210,544
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation, net of tax benefits									4,349	3,629	7,475
Net cash provided by operating activities									572,049	189,545	226,649
Investing Activities
Net additions of premises and equipment									(9,436)	(11,717)	(16,398)
Net cash used in investing activities									(3,906,701)	(3,563,696)	(42,682)
Financing Activities
Net decrease in other borrowed funds									3,526	564	14,109
Cash dividends paid									(145,557)	(131,263)	(124,468)
Tax withholding payments for stock-based compensation									(1,553)	(1,082)	(1,293)
Proceeds from stock option exercises									265	993	2,896
Net cash provided by (used in) financing activities									3,139,196	3,676,332	(56,796)
Net (decrease) increase in cash, cash equivalents and restricted cash									(195,456)	302,181	127,171
Cash, cash equivalents and restricted cash at beginning of period				633,142				330,961	633,142	330,961	203,790
Cash, cash equivalents and restricted cash at end of period	437,686				633,142				437,686	633,142	330,961
Parent Company
Operating Activities
Net income									284,757	266,400	210,544
Adjustments to reconcile net income to net cash provided by operating activities:
Subsidiary income in excess of dividends distributed									(91,336)	(87,703)	(83,806)
Stock-based compensation, net of tax benefits									1,628	1,216	1,320
Net change in other assets and other liabilities									(7,245)	(7,222)	1,854
Net cash provided by operating activities									187,804	172,691	129,912
Investing Activities
Net additions of premises and equipment									(13)	(111)	(114)
Proceeds from sale of marketable equity securities									186	0	89
Equity received from (contributed to) subsidiaries									248	(13,638)	(13,485)
Net cash used in investing activities									421	(13,749)	(13,510)
Financing Activities
Net decrease in other borrowed funds									(7,500)	0	0
Cash dividends paid									(145,557)	(131,263)	(124,468)
Tax withholding payments for stock-based compensation									(1,553)	(1,082)	(1,293)
Proceeds from stock option exercises									265	993	2,896
Net cash provided by (used in) financing activities									(154,345)	(131,352)	(122,865)
Net (decrease) increase in cash, cash equivalents and restricted cash									33,880	27,590	(6,463)
Cash, cash equivalents and restricted cash at beginning of period				$ 85,426				$ 57,836	85,426	57,836	64,299
Cash, cash equivalents and restricted cash at end of period	$ 119,306				$ 85,426				$ 119,306	$ 85,426	$ 57,836

Unaudited Quarterly Financial_3

Unaudited Quarterly Financial Data (Condensed) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Summarized unaudited quarterly financial data
Interest income	$ 192,825	$ 166,741	$ 159,956	$ 161,552	$ 171,308	$ 157,487	$ 155,404	$ 142,865	$ 681,074	$ 627,064	$ 546,177
Interest expense	5,203	4,128	4,487	4,740	5,550	6,084	7,185	8,496	18,558	27,315	42,773
Net Interest Income	187,622	162,613	155,469	156,812	165,758	151,403	148,219	134,369	662,516	599,749	503,404
Provision for credit losses	27,956	725	(5,653)	48	(1,535)	5,186	16,929	19,185	23,076	39,765	57
Net interest income after provision for credit losses	159,666	161,888	161,122	156,764	167,293	146,217	131,290	115,184	639,440	559,984	503,347
Non-interest income	34,362	34,815	35,522	40,121	44,704	53,667	41,224	33,272	144,820	172,867	130,774
Non-interest expense	134,047	104,108	100,082	96,585	111,187	103,373	94,764	95,487	434,822	404,811	374,927
Income Before Income Taxes	59,981	92,595	96,562	100,300	100,810	96,511	77,750	52,969	349,438	328,040	259,194
Federal and state income tax expense	9,272	16,976	18,935	19,498	18,950	18,754	14,306	9,630	64,681	61,640	48,650
Net Income	$ 50,709	$ 75,619	$ 77,627	$ 80,802	$ 81,860	$ 77,757	$ 63,444	$ 43,339	$ 284,757	$ 266,400	$ 210,544
Basic earnings per share (in dollars per share)	$ 0.46	$ 0.79	$ 0.81	$ 0.85	$ 0.86	$ 0.81	$ 0.67	$ 0.46	$ 2.87	$ 2.81	$ 2.39
Diluted earnings per share (in dollars per share)	$ 0.46	$ 0.79	$ 0.81	$ 0.85	$ 0.86	$ 0.81	$ 0.66	$ 0.46	$ 2.86	$ 2.81	$ 2.38

Fair Value of Assets and Liab_3

Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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, gains (losses)	$ 5,496,000	$ (5,368,000)	$ 661,000

Fair Value of Assets and Liab_4

Fair Value of Assets and Liabilities - Fair Value Measurements on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Recurring measurements
Financial Assets
Loans held for sale, at fair value	$ 60,797	$ 166,572
Total assets measured at fair value on a recurring basis	9,235,588	5,513,192
Financial Liabilities
Total financial liabilities	80	2,056
Interest rate caps | Recurring measurements
Financial Assets
Interest rate caps	934	201
Interest rate locks | Recurring measurements
Financial Assets
Interest rate caps	3,008	8,605
TBA hedge
Financial Liabilities
TBA hedge
TBA hedge | Recurring measurements
Financial Liabilities
TBA hedge	80	2,056
U.S. government and federal agency | Recurring measurements
Financial Assets
Debt securities, available-for-sale	1,346,749	38,588
U.S. government sponsored enterprises | Recurring measurements
Financial Assets
Debt securities, available-for-sale	240,693	9,781
State and local governments | Recurring measurements
Financial Assets
Debt securities, available-for-sale	488,858	1,416,683
Corporate bonds | Recurring measurements
Financial Assets
Debt securities, available-for-sale	180,752	349,098
Residential mortgage-backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	5,699,659	2,289,090
Commercial mortgage-backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	1,214,138	1,234,574
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 financial liabilities	0	0
Level 1 | Interest rate caps | Recurring measurements
Financial Assets
Interest rate caps		0
Level 1 | Interest rate locks | Recurring measurements
Financial Assets
Interest rate caps	0	0
Level 1 | TBA hedge | Recurring measurements
Financial Liabilities
TBA hedge	0	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	60,797	166,572
Total assets measured at fair value on a recurring basis	9,235,588	5,513,192
Financial Liabilities
Total financial liabilities	80	2,056
Level 2 | Interest rate caps | Recurring measurements
Financial Assets
Interest rate caps	934	201
Level 2 | Interest rate locks | Recurring measurements
Financial Assets
Interest rate caps	3,008	8,605
Level 2 | TBA hedge | Recurring measurements
Financial Liabilities
TBA hedge	80	2,056
Level 2 | U.S. government and federal agency | Recurring measurements
Financial Assets
Debt securities, available-for-sale	1,346,749	38,588
Level 2 | U.S. government sponsored enterprises | Recurring measurements
Financial Assets
Debt securities, available-for-sale	240,693	9,781
Level 2 | State and local governments | Recurring measurements
Financial Assets
Debt securities, available-for-sale	488,858	1,416,683
Level 2 | Corporate bonds | Recurring measurements
Financial Assets
Debt securities, available-for-sale	180,752	349,098
Level 2 | Residential mortgage-backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	5,699,659	2,289,090
Level 2 | Commercial mortgage-backed securities | Recurring measurements
Financial Assets
Debt securities, available-for-sale	1,214,138	1,234,574
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 financial liabilities	0	0
Level 3 | Interest rate caps | Recurring measurements
Financial Assets
Interest rate caps		0
Level 3 | Interest rate locks | Recurring measurements
Financial Assets
Interest rate caps	0	0
Level 3 | TBA hedge | Recurring measurements
Financial Liabilities
TBA hedge	0	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 of Assets and Liab_5

Fair Value of Assets and Liabilities - Fair Value Measurements on a Non-Recurring Basis (Details) - Nonrecurring Measurements - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned		$ 564
Collateral-dependent impaired loans, net of ACL	$ 22,036	26,749
Total assets measured at fair value on a recurring basis	22,036	27,313
Level 1
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned		0
Collateral-dependent impaired loans, net of ACL	0	0
Total assets measured at fair value on a 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
Collateral-dependent impaired loans, net of ACL	0	0
Total assets measured at fair value on a 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		564
Collateral-dependent impaired loans, net of ACL	22,036	26,749
Total assets measured at fair value on a recurring basis	$ 22,036	$ 27,313

Fair Value of Assets and Liab_6

Fair Value of Assets and Liabilities - Quantitative Information about Level 3 Fair Value Measurements (Details) - Nonrecurring Measurements $ in Thousands	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned		$ 564
Collateral-dependent impaired loans, net of ACL	$ 22,036	26,749
Level 3
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned		564
Collateral-dependent impaired loans, net of ACL	22,036	26,749
Level 3 | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned		564
Collateral-dependent impaired loans, net of ACL	1,102	25,309
Level 3 | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ACL	$ 20,934	144
Level 3 | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ACL		$ 1,296
Level 3 | Minimum Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned, measurement input		0.080
Impaired loans, measurement input	0.050	0.100
Level 3 | Minimum Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input	0	0
Level 3 | Minimum Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input	0.100	0.100
Level 3 | Minimum Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.100
Level 3 | Minimum Range | Combined Approach | Discount rate
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.080
Level 3 | Maximum Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned, measurement input		0.100
Impaired loans, measurement input	0.100	0.100
Level 3 | Maximum Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input	0.100	1
Level 3 | Maximum Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input	0.100	0.100
Level 3 | Maximum Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.100
Level 3 | Maximum Range | Combined Approach | Discount rate
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.080
Level 3 | Weighted Average Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned, measurement input		0.090
Impaired loans, measurement input	0.067	0.001
Level 3 | Weighted Average Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input	0.060	0.111
Level 3 | Weighted Average Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input	0.100	0.100
Level 3 | Weighted Average Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.100
Level 3 | Weighted Average Range | Combined Approach | Discount rate
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.080

Fair Value of Assets and Liab_7

Fair Value of Assets and Liabilities - Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Carrying Amount
Financial assets
Cash and cash equivalents	$ 437,686	$ 633,142
Debt securities, held-to-maturity	1,199,164	189,836
Loans receivable, net of ACL	13,259,366	10,964,453
Total financial assets	14,896,216	11,787,431
Financial liabilities
Term deposits	1,036,077	978,779
Repurchase agreements and other borrowed funds	1,064,888	1,037,651
Subordinated debentures	132,620	139,959
Total financial liabilities	2,233,585	2,156,389
Estimated Fair Value | Level 1
Financial assets
Cash and cash equivalents	437,686	633,142
Debt securities, held-to-maturity	0	0
Loans receivable, net of ACL	0	0
Total financial assets	437,686	633,142
Financial liabilities
Term deposits	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	1,220,883	203,216
Loans receivable, net of ACL	0	0
Total financial assets	1,220,883	203,216
Financial liabilities
Term deposits	1,040,100	983,491
Repurchase agreements and other borrowed funds	1,064,888	1,037,651
Subordinated debentures	131,513	123,944
Total financial liabilities	2,236,501	2,145,086
Estimated Fair Value | Level 3
Financial assets
Cash and cash equivalents	0	0
Debt securities, held-to-maturity	0	0
Loans receivable, net of ACL	13,422,898	11,233,002
Total financial assets	13,422,898	11,233,002
Financial liabilities
Term deposits	0	0
Repurchase agreements and other borrowed funds	0	0
Subordinated debentures	0	0
Total financial liabilities	$ 0	$ 0

Commitments and Contingent Li_3

Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Outstanding Commitments
Outstanding commitments	$ 4,392,019	$ 3,022,620
Unused lines of credit
Outstanding Commitments
Outstanding commitments	4,271,583	2,957,259
Letters of credit
Outstanding Commitments
Outstanding commitments	$ 120,436	$ 65,361

Mergers and Acquisitions - Cons

Mergers and Acquisitions - Consideration Transferred, Identifiable Net Assets Acquired and Goodwill Recognized (Details) - USD ($) $ in Thousands	Oct. 01, 2021	Feb. 29, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Liabilities assumed
Goodwill recognized			$ 471,380	$ 57,595	$ 166,832
Altabank
Fair value of consideration transferred
Fair value of Company shares issued	$ 839,853
Cash consideration	9
Total fair value of consideration transferred	839,862
Identifiable assets acquired
Cash and cash equivalents	1,622,727
Debt securities	6,658
Loans receivable, net of ACL	1,901,950
Core deposit Intangible	7,021
Accrued income and other assets	121,926
Total identifiable assets acquired	3,660,282
Liabilities assumed
Deposits	3,273,819
Borrowings	0
Accrued expenses and other liabilities	17,981
Total liabilities assumed	3,291,800
Total identifiable net assets	368,482
Goodwill recognized	$ 471,380
Core deposit intangible, weighted average useful life (in years)	10 years
State Bank of Arizona
Fair value of consideration transferred
Fair value of Company shares issued		$ 112,133
Cash consideration		13,721
Total fair value of consideration transferred		125,854
Identifiable assets acquired
Cash and cash equivalents		57,434
Debt securities		142,174
Loans receivable, net of ACL		451,653
Core deposit Intangible		2,593
Accrued income and other assets		33,971
Total identifiable assets acquired		687,825
Liabilities assumed
Deposits		603,289
Borrowings		10,904
Accrued expenses and other liabilities		5,373
Total liabilities assumed		619,566
Total identifiable net assets		68,259
Goodwill recognized		$ 57,595
Core deposit intangible, weighted average useful life (in years)		10 years

Mergers and Acquisitions - Narr

Mergers and Acquisitions - Narrative (Details) - USD ($) $ in Thousands	Oct. 01, 2021	Feb. 29, 2020	Dec. 31, 2021
Altabank
Business Acquisition
Percentage of outstanding common stock acquired	100.00%
Fair value of consideration transferred	$ 839,862
Number of shares issued for acquisition (in shares)	15,173,482
Cash consideration	$ 9
Loans receivable	1,902,321
Loans receivable acquired, gross principal and contractual interest due	1,923,392
Third-party acquisition related costs	$ 9,546
Net interest income and non-interest income			$ 29,966
Net income			(9,415)
State Bank of Arizona
Business Acquisition
Percentage of outstanding common stock acquired		100.00%
Fair value of consideration transferred		$ 125,854
Number of shares issued for acquisition (in shares)		3,007,044
Cash consideration		$ 13,721
Loans receivable		451,702
Loans receivable acquired, gross principal and contractual interest due		452,510
Third-party acquisition related costs		$ 4,489
Net interest income and non-interest income			31,606
Net income			$ 8,524

Mergers and Acquisitions - Pro

Mergers and Acquisitions - Pro Forma Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current Year Acquisitions
Pro Forma Information
Net interest income and non-interest income	$ 886,370	$ 898,761
Net income	$ 296,940	309,902
Previous Acquisitions
Pro Forma Information
Net interest income and non-interest income		777,869	$ 664,789
Net income		$ 265,289	$ 218,365