Columbia Banking System (COLB) 10-Q 6 Aug 21 2021 Q2 Quarterly report Financial data

Document

Document - shares	6 Months Ended
	Jun. 30, 2021	Jul. 31, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	000-20288
Entity Registrant Name	COLUMBIA BANKING SYSTEM, INC.
Entity Incorporation, State or Country Code	WA
Entity Tax Identification Number	91-1422237
Entity Address, Address Line One	1301 A Street
Entity Address, City or Town	Tacoma
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98402-2156
City Area Code	253
Local Phone Number	305-1900
Title of 12(b) Security	Common Stock, No Par Value
Trading Symbol	COLB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		71,767,227
Entity Central Index Key	0000887343
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 218,649	$ 218,899
Interest-earning deposits with banks	612,883	434,867
Total cash and cash equivalents	831,532	653,766
Debt securities available for sale at fair value	4,190,066	5,210,134
Debt Securities, Held-to-Maturity, Amortized Cost	2,024,715	0
Equity Securities	13,425	13,425
FHLB stock at cost	10,280	10,280
Loans held for sale	13,179	26,481
Loans, net of unearned income	9,693,116	9,427,660
Less: Allowance for credit losses	142,988	149,140
Loans, net	9,550,128	9,278,520
Interest receivable	52,347	54,831
Premises and equipment, net	158,827	162,059
OREO	381	553
Goodwill	765,842	765,842
Other intangible assets, net	22,958	26,734
Other assets	379,797	382,154
Total assets	18,013,477	16,584,779
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing	7,703,325	6,913,214
Interest-bearing	7,642,107	6,956,648
Total deposits	15,345,432	13,869,862
FHLB advances	7,386	7,414
Securities sold under agreements to repurchase	70,994	73,859
Subordinated debentures	35,000	35,092
Other liabilities	221,419	250,945
Total liabilities	$ 15,680,231	$ 14,237,172
Shareholders' equity:
Preferred Stock, Authorized shares	2,000	2,000
Common Stock Authorized shares	115,000	115,000
Common Stock Shares Issued	73,926	73,782
Common Stock Issued value	$ 1,664,953	$ 1,660,998
Common Stock, Shares, Outstanding	71,742	71,598
Retained earnings	$ 642,018	$ 575,248
Accumulated other comprehensive income	$ 97,109	$ 182,195
Treasury Stock, Shares	2,184	2,184
Treasury Stock, Value	$ (70,834)	$ (70,834)
Total shareholders’ equity	2,333,246	2,347,607
Total liabilities and shareholders’ equity	$ 18,013,477	$ 16,584,779

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ / shares in Thousands, $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Amortized Cost	$ 4,103,196	$ 4,997,529
Debt Securities, Held-to-maturity, Fair Value	$ 2,032,980	$ 0
Preferred Stock, No Par Value	$ 0	$ 0
Common Stock, No Par Value	$ 0	$ 0

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest Income
Loans	$ 99,712	$ 105,496	$ 200,027	$ 212,862
Taxable securities	24,750	18,343	47,566	39,431
Tax-exempt securities	2,826	2,257	5,585	4,559
Deposits in banks	159	136	311	277
Total interest income	127,447	126,232	253,489	257,129
Interest Expense
Deposits	1,426	2,094	2,911	5,736
FHLB advances and FRB borrowings	72	1,796	144	6,025
Subordinated debentures	468	468	936	936
Other borrowings	19	23	42	159
Total interest expense	1,985	4,381	4,033	12,856
Net Interest Income	125,462	121,851	249,456	244,273
Provision (recapture) for credit losses	(5,500)	33,500	(6,300)	75,000
Net interest income after provision (recapture) for credit losses	130,962	88,351	255,756	169,273
Noninterest Income
Deposit account and treasury management fees	6,701	6,092	13,059	13,880
Card revenue	4,773	3,079	8,506	6,597
Financial services and trust revenue	4,245	3,163	7,626	6,228
Loan revenue	4,514	5,607	11,883	10,197
Bank owned life insurance	1,635	1,618	3,195	3,214
Investment securities gains, net	314	16,425	314	16,674
Other	548	1,275	1,313	1,676
Total noninterest income	22,730	37,259	45,896	58,466
Noninterest Expense
Compensation and employee benefits	53,450	46,043	105,186	100,885
Occupancy	9,038	8,812	18,044	18,009
Data processing and software	7,402	7,981	15,853	15,080
Legal and professional fees	3,264	3,483	6,079	5,585
Amortization of intangibles	1,852	2,210	3,776	4,520
B&O taxes	1,490	1,244	2,749	1,868
Advertising and promotion	588	837	1,348	2,142
Regulatory premiums	1,112	1,034	2,217	1,068
Net cost (benefit) of operation of OREO	111	(200)	48	(188)
Other	5,809	9,389	12,375	16,135
Total noninterest expense	84,116	80,833	167,675	165,104
Income before income taxes	69,576	44,777	133,977	62,635
Income tax provision	14,537	8,195	27,085	11,425
Net Income	$ 55,039	$ 36,582	$ 106,892	$ 51,210
Earnings per common share
Basic	$ 0.77	$ 0.52	$ 1.50	$ 0.72
Diluted	$ 0.77	$ 0.52	$ 1.50	$ 0.72
Weighted average number of common shares outstanding	70,987	70,679	70,924	70,942
Weighted average number of diluted common shares outstanding	71,164	70,711	71,079	70,981

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Income	$ 55,039	$ 36,582	$ 106,892	$ 51,210
Unrealized gain from securities
Net unrealized holding gain from available for sale debt securities arising during the period, net of tax	21,850	42,860	(80,755)	122,556
Reclassification adjustment of net gain from sale of available for sale debt securities included in income, net of tax	(241)	0	(241)	(191)
Amortization of net unrealized gain for the reclassification of available for sale securities to held to maturity, after Tax	345	0	345	0
Net unrealized gain from securities, net of reclassification adjustment	21,264	42,860	(81,341)	122,365
Pension plan liability adjustment:
Amortization of unrecognized net actuarial loss included in net periodic pension cost, net of tax	115	79	230	159
Pension plan liability adjustment, net	115	79	230	159
Unrealized gain from cash flow hedging instruments
Net unrealized gain (loss) in cash flow hedging instruments arising during the period, net of tax	0	2,611	0	20,588
Reclassification adjustment for net gain in cash flow hedging instruments included in income, net of tax	1,998	1,680	3,975	2,402
Net unrealized gain from cash flow hedging instruments, net of reclassification adjustment	(1,998)	931	(3,975)	18,186
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	19,381	43,870	(85,086)	140,710
Total comprehensive income	$ 74,420	$ 80,452	$ 21,806	$ 191,920

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net unrealized holding gain (loss) from available for sale securities arising during the period, tax	$ (6,619)	$ (12,984)	$ 24,463	$ (37,126)
Reclassification adjustment of net gain from sale of available for sale securities included in income, tax	73	0	73	58
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), Tax	105	0	105	0
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost, tax	(34)	(24)	(69)	(48)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	0	(791)	0	(6,237)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	$ 604	$ 510	$ 1,203	$ 728

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]
Shares, Outstanding		72,124
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU | Accounting Standards Update 2016-02 [Member]	$ (2,457)		$ (2,457)
Balance, value at Dec. 31, 2019	2,159,962	$ 1,650,753	519,676	$ 40,367	$ (50,834)
Net income	51,210		51,210
Other comprehensive income (loss)	140,710			140,710
Issuance of common stock - employee stock purchase plan, shares		26
Issuance of common stock - employee stock purchase plan, value	$ 945	$ 945
Activity in Deferred Compensation Plan, shares	0
Activity in Deferred Compensation Plan, value	$ 4
Issuance of common stock - RSAs and RSUs, net of canceled awards, shares		234
Issuance of common stock - RSAs and RSUs, net of canceled awards, value	4,909	$ 4,909
Purchase and retirement of common stock, shares		(67)
Purchase and retirement of common stock, value	(2,482)	$ (2,482)
Cash dividends declared on common stock	(56,046)		(56,046)
Purchase of treasury stock, shares		(731)
Purchase of treasury stock, value	(20,000)				(20,000)
Balance, value at Jun. 30, 2020	2,276,755	$ 1,654,129	512,383	181,077	(70,834)
Shares, Outstanding		71,575
Balance, value at Mar. 31, 2020	2,213,602	$ 1,651,399	495,830	137,207	(70,834)
Net income	36,582		36,582
Other comprehensive income (loss)	$ 43,870			43,870
Activity in Deferred Compensation Plan, shares	0
Activity in Deferred Compensation Plan, value	$ 1	$ 1
Issuance of common stock - RSAs and RSUs, net of canceled awards, shares		12
Issuance of common stock - RSAs and RSUs, net of canceled awards, value	2,737	$ 2,737
Purchase and retirement of common stock, shares		(1)
Purchase and retirement of common stock, value	(8)	$ (8)
Cash dividends declared on common stock	(20,029)		(20,029)
Balance, value at Jun. 30, 2020	2,276,755	$ 1,654,129	512,383	181,077	(70,834)
Shares, Outstanding		71,586
Shares, Outstanding		71,598
Balance, value at Dec. 31, 2020	2,347,607	$ 1,660,998	575,248	182,195	(70,834)
Net income	106,892		106,892
Other comprehensive income (loss)	(85,086)			(85,086)
Issuance of common stock - employee stock purchase plan, shares		41
Issuance of common stock - employee stock purchase plan, value	1,098	$ 1,098
Activity in Deferred Compensation Plan, shares		0
Activity in Deferred Compensation Plan, value	(8)	$ (8)
Issuance of common stock - RSAs and RSUs, net of canceled awards, shares		192
Issuance of common stock - RSAs and RSUs, net of canceled awards, value	6,936	$ 6,936
Purchase and retirement of common stock, shares		(89)
Purchase and retirement of common stock, value	(4,071)	$ (4,071)
Cash dividends declared on common stock	(40,122)		(40,122)
Balance, value at Jun. 30, 2021	2,333,246	$ 1,664,953	642,018	97,109	(70,834)
Shares, Outstanding		71,739
Balance, value at Mar. 31, 2021	2,275,063	$ 1,661,129	607,040	77,728	(70,834)
Net income	55,039		55,039
Other comprehensive income (loss)	19,381			19,381
Activity in Deferred Compensation Plan, shares		0
Activity in Deferred Compensation Plan, value	(8)	$ (8)
Issuance of common stock - RSAs and RSUs, net of canceled awards, shares		4
Issuance of common stock - RSAs and RSUs, net of canceled awards, value	3,908	$ 3,908
Purchase and retirement of common stock, shares		1
Purchase and retirement of common stock, value	(76)	$ (76)
Cash dividends declared on common stock	(20,061)		(20,061)
Balance, value at Jun. 30, 2021	$ 2,333,246	$ 1,664,953	$ 642,018	$ 97,109	$ (70,834)
Shares, Outstanding		71,742

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash dividends declared on common stock, per share	$ 0.28	$ 0.28	$ 0.56	$ 0.78

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows From Operating Activities
Net income	$ 106,892	$ 51,210
Adjustments to reconcile net income to net cash provided by operating activities
Provision (recapture) for credit losses	(6,300)	75,000
Stock-based compensation expense	6,936	4,909
Depreciation, amortization and accretion	7,056	10,382
Investment securities gain, net	314	16,674
Net realized gain on sale of premises and equipment, loans held for investment and OPPO	279	705
Net realized loss on sale and valuation adjustments of OREO	(40)	(18)
Gain on bank owned life insurance death benefit	209	0
Originations of loans held for sale	195,632	217,017
Proceeds from sales of loans held for sale	208,789	205,932
Change in fair value of loans held for sale	145	0
Net change in:
Interest receivable	2,484	(12,310)
Interest payable	(49)	(219)
Other assets	12,583	(93,919)
Other liabilities	(14,700)	76,500
Net cash provided by operating activities	127,442	83,107
Cash Flows From Investing Activities
Loans originated, net of principal collected	(177,399)	(1,026,250)
Purchases of debt securities available for sale	(1,527,512)	(259,236)
Purchases of debt securities held to maturity	(22,915)	0
Purchases of loans held for investment	74,383	0
Purchases of premises and equipment	(3,087)	(4,490)
Purchases of FHLB stock	0	(53,240)
Proceeds from sale of debt securities, available-for-sale	26,914	194,105
Proceeds from sale of equity securities	0	3,000
Proceeds from principal repayments and maturities of debt securities available for sale	385,408	265,072
Proceeds from repayments and maturities of securities held to maturity	8,711	0
Proceeds from sales of premises and equipment	4,296	932
Proceeds from redemption of Federal Home Loan Bank stock	0	85,080
Proceeds from sales of other real estate and other personal property owned	132	353
Proceeds from bank owned life insurance death benefit	671	1,050
Net cash used in investing activities	(1,379,164)	(793,624)
Cash Flows From Financing Activities
Net increase in deposits	1,475,570	2,446,782
Net decrease in sweep repurchase agreements	(2,865)	(12,958)
Proceeds from FHLB advances	10	1,331,000
Proceeds from FRB borrowings	0	222,010
Proceeds from other borrowings	0	9,222
Proceeds from exercise of stock options and employee stock purchase plan	1,098	945
Repayment of FHLB advances	(10)	(2,127,000)
Repayment of FRB borrowings	0	222,010
Repayments of other borrowings	0	9,222
Payments for common stock dividends	(40,244)	(55,750)
Purchase of treasury stock	0	(20,000)
Purchase and retirement of common stock	4,071	2,482
Net cash provided by financing activities	1,429,488	1,560,537
Increase (decrease) in cash and cash equivalents	177,766	850,020
Cash and cash equivalents at beginning of period	653,766	247,673
Cash and cash equivalents at end of period	831,532	1,097,693
Supplemental Information:
Cash paid for interest	4,082	13,075
Income Taxes Paid, Net	28,474	21,501
Non-cash investing and financing activities
Securities transfer from AFS to HTM, fair value	2,012,123	0
Loans transferred to OREO	0	558
Premises and equipment expenditures incurred but not yet paid	0	9
Change in dividends payable on unvested shares included in other liabilities	$ (122)	$ 296

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Basis of Presentation And Significant Accounting Policies
Basis of Presentation and Significant Accounting Policies	Basis of Presentation, Significant Accounting Policies and Reclassifications Basis of Presentation The interim unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and with instructions to Form 10-Q and Article 10 of Regulation S-X. The Consolidated Financial Statements include the accounts of Columbia Banking System, Inc. (“we”, “our”, “Columbia” or the “Company”) and its subsidiaries, including its wholly owned banking subsidiary Columbia State Bank (“Columbia Bank” or the “Bank”) and Columbia Trust Company (“Columbia Trust”). All intercompany transactions and accounts have been eliminated in consolidation. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair statement of the results for the interim periods presented have been included. The results of operations for the six months ended June 30, 2021 are not necessarily indicative of results to be anticipated for the year ending December 31, 2021. The accompanying interim unaudited Consolidated Financial Statements should be read in conjunction with the financial statements and related notes contained in the Company’s 2020 Annual Report on Form 10-K. Significant Accounting Policies The significant accounting policies used in preparation of our Consolidated Financial Statements are disclosed in our 2020 Annual Report on Form 10-K. There have not been any changes in our significant accounting policies compared to those contained in our 2020 Form 10-K disclosure for the year ended December 31, 2020. Reclassifications Certain amounts reported in prior periods have been reclassified in the Consolidated Financial Statements to conform to the current presentation. Specifically, amounts related to software expense, which prior to January 1, 2021 had historically been included in “Other” noninterest expense, have been combined with data processing expense in the row titled “Data processing and software” in the Consolidated Statements of Income. The reclassifications have no effect on net income or shareholders’ equity as previously reported.

Accounting Pronouncements Recen

Accounting Pronouncements Recently Adopted or Issued	6 Months Ended
	Jun. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements Recently Adopted or Issued	Accounting Pronouncements Recently Adopted or Issued Accounting Standards Adopted in 2021 In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting . In response to concerns about structural risks of the cessation of LIBOR, the amendments in this ASU provide optional guidance for a limited time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The amendments in this ASU provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments in this ASU apply only to contracts and hedging relationships that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022. The amendments in this ASU are elective and were effective March 12, 2020 for all entities. The adoption of this ASU did not have a material impact on the Company’s Consolidated Financial Statements. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes. The guidance issued in this ASU simplifies the accounting for income taxes by eliminating certain exceptions to the guidance in ASC 740 related to the approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period and the recognition for deferred tax liabilities for outside basis differences. This ASU also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. The ASU is effective for interim and annual reporting periods beginning after December 15, 2020. The adoption of this ASU did not have a material impact on the Company’s Consolidated Financial Statements. In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848) - Scope. The amendments in this ASU clarify that certain optional expedients and exceptions for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. Certain provisions, if elected, apply to derivative instruments that use an interest rate for margining, discounting or contract price alignment that is modified as a result of reference rate reform. Amendments in this ASU to the expedients and exceptions in Topic 848 capture the incremental consequences of the scope clarification and tailor the existing guidance to derivative instruments affected by the discounting transition. The ASU is effective for interim and annual reporting periods beginning on January 7, 2021. The adoption of this ASU is not expected to have a material impact on the Company’s Consolidated Financial Statements. Recently Issued Accounting Standards, Not Yet Adopted There are no recently issued accounting standards that are applicable to the Company and not yet adopted.

Securities

Securities	6 Months Ended
	Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Securities During the second quarter of 2021, the Company transferred, at fair value, $2.01 billion of U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations from the available for sale classification to the held to maturity classification. The net unrealized after tax gain of $15.5 million remained in accumulated other comprehensive income and will be amortized over the remaining life of the securities, offsetting the related amortization of discount or premium on the transferred securities. No gains or losses were recognized at the time of the transfer. The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of debt securities: Amortized Gross Gross Fair Value June 30, 2021 (in thousands) Available for sale U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 2,671,827 $ 74,715 $ (9,342) $ 2,737,200 Other asset-backed securities 429,983 6,307 (3,976) 432,314 State and municipal securities 748,224 18,294 (2,458) 764,060 U.S. government agency and government-sponsored enterprise securities 253,162 4,663 (1,333) 256,492 Total available for sale $ 4,103,196 $ 103,979 $ (17,109) $ 4,190,066 Held to maturity U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 2,024,715 $ 9,586 $ (1,321) $ 2,032,980 Total held to maturity $ 2,024,715 $ 9,586 $ (1,321) $ 2,032,980 December 31, 2020 Available for sale U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 3,640,351 $ 178,579 $ (4,543) $ 3,814,387 Other asset-backed securities 349,904 9,651 (2,076) 357,479 State and municipal securities 729,066 25,098 (592) 753,572 U.S. government agency and government-sponsored enterprise securities 278,208 6,545 (57) 284,696 Total available for sale $ 4,997,529 $ 219,873 $ (7,268) $ 5,210,134 There was no allowance for credit losses on both available for sale securities and held to maturity securities as of June 30, 2021 and December 31, 2020. All of the Company’s debt securities held to maturity were issued by U.S. government agencies or U.S. government-sponsored enterprises. These securities carry the explicit and/or implicit guarantee of the U.S. government, are widely recognized as “risk free,” and have a long history of zero credit loss. A debt security is placed on nonaccrual status at the time any principal or interest payments become 90 days delinquent. Interest accrued but not received for a security placed on nonaccrual is reversed against interest income. There were no amounts of accrued interest reversed against interest income for the three and six months ended June 30, 2021 and 2020. Accrued interest receivable for debt securities is included in “Interest receivable” on the Company’s Consolidated Balance Sheet and is not reflected in the balances in the table above. At June 30, 2021 and December 31, 2020, accrued interest receivable for securities available for sale was $15.1 million and $17.1 million, respectively. Accrued interest for securities held to maturity was $4.2 million at June 30, 2021. There was no accrued interest receivable related to securities held to maturity at December 31, 2020, as the Company did not have held to maturity securities at that date. The Company does not measure an allowance for credit losses for accrued interest receivable. The following table provides the proceeds and both gross realized gains and losses on sales and calls of debt securities available for sale as well as other securities gains and losses for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Proceeds from sales of debt securities available for sale $ 26,914 $ — $ 26,914 $ 194,105 Gross realized gains from sales of debt securities available for sale $ 751 $ — $ 751 $ 435 Gross realized losses from sales of debt securities available for sale (437) — (437) (186) Other securities gains (1) — 16,425 — 16,425 Investment securities gains, net $ 314 $ 16,425 $ 314 $ 16,674 __________ (1) Other securities gains includes gain from sale of Visa Class B restricted stock and subsequent write up to fair value of remaining Visa Class B shares. For additional information, please see Note 13 . The following table provides the unrealized gains and losses on equity securities at the reporting date: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Gains recognized during the period on equity securities (1) $ — $ 16,425 $ — $ 16,425 Less: Gains recognized during the period on equity securities sold during the period (1) — (3,000) — (3,000) Unrealized gains recognized during the reporting period on equity securities still held at the reporting date (1) $ — $ 13,425 $ — $ 13,425 __________ (1) Visa Class B restricted stock owned by the Company was carried at a zero-cost basis prior to June 2020 due to existing transfer restrictions and uncertainty regarding the outcome of Visa’s litigation that must be settled before the Visa Class B restricted shares may be converted into publicly traded Visa Class A common shares. The sale of shares by the Company of Visa Class B restricted shares during the three months ended June 30, 2020 resulted in an observable market price. As a result, the Company adjusted the carrying value of its remaining shares of Visa Class B restricted shares upward to this observable market price. The scheduled contractual maturities of debt securities at the period presented below are as follows: June 30, 2021 Available for sale Held to maturity Amortized Cost Fair Value Amortized Cost Fair Value (in thousands) Due within one year $ 57,266 $ 57,900 $ — $ — Due after one year through five years 751,065 779,527 26,224 26,163 Due after five years through ten years 1,531,719 1,578,489 1,241,524 1,248,569 Due after ten years 1,763,146 1,774,150 756,967 758,248 Total debt securities $ 4,103,196 $ 4,190,066 $ 2,024,715 $ 2,032,980 The following table summarizes the carrying value of securities pledged as collateral to secure public funds, borrowings and other purposes as permitted or required by law: June 30, 2021 (in thousands) To secure public funds $ 492,636 To secure borrowings 100,289 Other securities pledged 187,276 Total securities pledged as collateral $ 780,201 The following table shows the gross unrealized losses and fair value of the Company’s debt securities available for sale for which an allowance for credit losses has not been recorded, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of the dates presented: Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized June 30, 2021 (in thousands) U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 807,523 $ (8,956) $ 23,308 $ (386) $ 830,831 $ (9,342) Other asset-backed securities 232,155 (3,976) 55 — 232,210 (3,976) State and municipal securities 223,105 (2,443) 1,647 (15) 224,752 (2,458) U.S. government agency and government-sponsored enterprise securities 150,218 (1,332) — (1) 150,218 (1,333) Total $ 1,413,001 $ (16,707) $ 25,010 $ (402) $ 1,438,011 $ (17,109) December 31, 2020 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 575,329 $ (3,728) $ 18,527 $ (815) $ 593,856 $ (4,543) Other asset-backed securities 143,764 (2,076) 70 — 143,834 (2,076) State and municipal securities 86,471 (592) — — 86,471 (592) U.S. government agency and government-sponsored enterprise securities 74,943 (57) — — 74,943 (57) Total $ 880,507 $ (6,453) $ 18,597 $ (815) $ 899,104 $ (7,268) Debt securities available for sale At June 30, 2021, there were 77 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligation securities in an unrealized loss position. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company concluded an allowance for credit losses is unnecessary at June 30, 2021. At June 30, 2021, there were 18 other asset-backed securities in an unrealized loss position. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company concluded an allowance for credit losses is unnecessary at June 30, 2021. At June 30, 2021, there were 66 state and municipal government securities in an unrealized loss position. The unrealized losses on state and municipal securities were caused by interest rate changes or widening of market spreads subsequent to the purchase of the individual securities. Management monitors published credit ratings of these securities for adverse changes. As of June 30, 2021, none of the rated obligations of state and local government entities held by the Company had a below investment grade credit rating. Because the credit quality of these securities are investment grade and the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company concluded an allowance for credit losses is unnecessary at June 30, 2021. At June 30, 2021, there were nine U.S. government securities in an unrealized loss position. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company concluded an allowance for credit losses is unnecessary at June 30, 2021. Equity Securities without Readily Determinable Fair Values Visa Class B Restricted Shares In 2008, the Company received Visa Class B restricted shares as part of Visa’s initial public offering. These shares are transferable only under limited circumstances until they can be converted into publicly traded Visa Class A common shares. This conversion will not occur until the settlement of certain litigation which is indemnified by Visa members, including the Company. Visa funded an escrow account from its initial public offering to settle these litigation claims. Should this escrow account not be sufficient to cover these litigation claims, Visa is entitled to fund additional amounts to the escrow account by reducing each member bank’s Visa Class B conversion ratio to unrestricted Visa Class A shares. During the second quarter of 2020, the Company sold 17,360 shares of Visa Class B restricted stock, which resulted in an observable market price. As a result, the Company adjusted the carrying value of its remaining Visa Class B restricted shares upward to this observable market price. At June 30, 2021, the Company owned 77,683 Visa Class B shares, which had a carrying value of $13.4 million.

Loans

Loans	6 Months Ended
	Jun. 30, 2021
Loans and Leases Receivable, Net Amount [Abstract]
Loans	Loans The Company’s loan portfolio includes originated and purchased loans. The following is an analysis of the loan portfolio by segment and class (net of unearned income): June 30, 2021 December 31, 2020 (dollars in thousands) Commercial loans: Commercial real estate $ 4,101,071 $ 4,062,313 Commercial business 3,738,288 3,597,968 Agriculture 797,580 779,627 Construction 300,303 268,663 Consumer loans: One-to-four family residential real estate 724,151 683,570 Other consumer 31,723 35,519 Total loans 9,693,116 9,427,660 Less: Allowance for credit losses (142,988) (149,140) Total loans, net $ 9,550,128 $ 9,278,520 At June 30, 2021 and December 31, 2020, the Company had no material foreign activities. Substantially all of the Company’s loans and unfunded commitments are geographically concentrated in its service areas within the states of Washington, Oregon and Idaho. At June 30, 2021 and December 31, 2020, $3.56 billion and $3.46 billion of commercial and residential real estate loans were pledged as collateral on FHLB advances and additional borrowing capacity. The Company has also pledged $200.3 million and $200.4 million of commercial loans to the FRB for additional borrowing capacity at June 30, 2021 and December 31, 2020, respectively. Accrued interest receivable for loans is included in “Interest receivable” on the Company’s Consolidated Balance Sheet and is not reflected in the balances in the table above. At June 30, 2021 and December 31, 2020, accrued interest receivable for loans was $33.1 million and $37.8 million, respectively. The Company does not measure an allowance for credit losses for accrued interest receivable. The following is an aging of the recorded investment of the loan portfolio at the dates presented: Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans June 30, 2021 (in thousands) Commercial loans: Commercial real estate $ 4,089,659 $ 8,244 $ 149 $ — $ 8,393 $ 3,019 $ 4,101,071 Commercial business 3,724,202 2,351 990 — 3,341 10,745 3,738,288 Agriculture 785,071 2,537 938 — 3,475 9,034 797,580 Construction 300,303 — — — — — 300,303 Consumer loans: One-to-four family residential real estate 720,854 775 1,343 — 2,118 1,179 724,151 Other consumer 31,658 20 1 — 21 44 31,723 Total $ 9,651,747 $ 13,927 $ 3,421 $ — $ 17,348 $ 24,021 $ 9,693,116 Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans December 31, 2020 (in thousands) Commercial loans: Commercial real estate $ 4,037,309 $ 17,292 $ — — $ 17,292 $ 7,712 $ 4,062,313 Commercial business 3,578,905 1,282 4,559 — 5,841 13,222 3,597,968 Agriculture 767,102 911 — — 911 11,614 779,627 Construction 268,304 — 142 — 142 217 268,663 Consumer loans: One-to-four family residential real estate 677,627 2,283 1,659 — 3,942 2,001 683,570 Other consumer 35,450 24 5 — 29 40 35,519 Total $ 9,364,697 $ 21,792 $ 6,365 $ — $ 28,157 $ 34,806 $ 9,427,660 Loan payments are considered timely when the contractual principal or interest due in accordance with the terms of the loan agreement or any portion thereof is received on the due date of the scheduled payment. In addition, the risk rating on loans modified in association with the CARES Act or Interagency guidance did not change. These loans are not considered past due until after the deferral period is over and scheduled payments resume. Accrued interest on these COVID-19 modified loans is due, in full, when the deferral period ends. The credit quality of these loans will be reevaluated after the deferral period ends. Nonaccrual loans are generally loans placed on a nonaccrual basis when they become 90 days past due or when there are otherwise serious doubts about the collectability of principal or interest within the existing terms of the loan. The Company’s policy is to write-off all accrued interest on loans when they are placed on nonaccrual status. The following table summarizes written-off interest on nonaccrual loans for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Commercial loans $ 212 $ 665 $ 424 $ 1,448 Consumer loans 2 8 9 13 Total $ 214 $ 673 $ 433 $ 1,461 The following summarizes the amortized cost of nonaccrual loans for which there was no related ACL for the periods indicated: June 30, 2021 December 31, 2020 (in thousands) Commercial loans: Commercial real estate $ 942 $ 6,393 Commercial business 6,125 6,382 Agriculture 6,744 8,136 Total $ 13,811 $ 20,911 The following is an analysis of loans classified as TDR for the periods indicated: Three Months Ended June 30, 2021 Three Months Ended June 30, 2020 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial loans: Commercial business 4 $ 1,757 $ 1,757 4 $ 1,690 $ 1,690 Consumer loans: One-to-four family residential real estate — — — 1 128 128 Total 4 $ 1,757 $ 1,757 5 $ 1,818 $ 1,818 Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial loans: Commercial real estate 1 $ 628 $ 628 — $ — $ — Commercial business 11 2,600 2,600 6 1,962 1,962 Agriculture — — — 1 895 895 Consumer loans: One-to-four family residential real estate 2 140 140 2 196 196 Total 14 $ 3,368 $ 3,368 9 $ 3,053 $ 3,053 The Company’s loans classified as TDR are loans that have been modified or with respect to which the borrower has been granted special concessions due to financial difficulties that, if not for the challenges of the borrower, the Company would not otherwise consider. The TDR modifications or concessions are made to increase the likelihood that these borrowers with financial difficulties will be able to satisfy their debt obligations as amended. The concessions granted in the restructurings, summarized in the table above, largely consisted of maturity extensions, interest rate modifications or a combination of both. In limited circumstances, a reduction in the principal balance of the loan could also be made as a concession. Loans classified as TDR are included with the loans collectively measured for credit losses. The Company had commitments to lend $988 thousand of additional funds on loans classified as TDR as of June 30, 2021. The Company had $651 thousand of such commitments at December 31, 2020. The Company had no loans classified as TDR that defaulted within 12 months of being classified as TDR during the three months and six months ended June 30, 2021 and 2020. Financial institutions are required to maintain records of the volume of loans involved in modifications to which troubled debt restructuring relief is applicable . At June 30, 2021, the Company ha d 10 short–term deferments on $40.7 million of loans, gross of unearned income . These short–term deferments are not classified as TDRs and will not be reported as past due provided that they are performing in accordance with the modified terms. The Company offered PPP loans to provide financial support to small and medium-size businesses to cover payroll and certain other expenses during the COVID-19 pandemic. The PPP was established by the CARES Act and is implemented by the U.S. SBA with support from the U.S. Department of Treasury. The program, which was amended by the Paycheck Protection Flexibility Act of 2020, provides small businesses with funds to pay up to 24 weeks of payroll costs including benefits, as well as interest on mortgages, rent and utilities. Funds are provided to small businesses in the form of loans that will be fully forgiven when used for permitted purposes and when at least 60% of the funds are used for payroll costs and applicable employment levels are maintained in accordance with the requirements of the amended PPP. At June 30, 2021, we had $691.9 million of PPP loans outstanding, which are included in commercial business loans.

Allowance for Credit Losses and

Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit	6 Months Ended
	Jun. 30, 2021
Allowance For Credit Losses and Allowance for Unfunded Commitments and Letters Of Credit [Abstract]
Allowance For Credit Losses And Allowance for Unfunded Loan Commitments And Letters Of Credit Text Block	Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit The ACL is determined through quarterly assessments of expected credit losses within the loan portfolio and is deducted from the loan’s amortized cost basis to present the net amount of loans expected to be collected. We estimate the ACL using relevant and reliable available information, which is derived from both internal and external sources, relating to past events, current conditions and reasonable and supportable forecasts. Additions to and recaptures from the ACL are charged to current period earnings through the provision for credit losses. Loan amounts that are determined to be uncollectible are charged directly against the ACL and netted against amounts recovered on previously charged-off loans. For the purpose of calculating portfolio level reserves, we have segmented our loan portfolio into two portfolio segments (Commercial and Consumer). The Commercial and Consumer portfolio segments are then further broken down into loan classes by risk characteristics. The risk characteristics include regulatory call codes, type of industry and collateral type. The ACL is comprised of reserves measured on a collective (pool) basis using a quantitative DCF model for all loan classes with similar risk characteristics and then qualitatively adjusted for large loan concentrations, policy exemptions granted and other factors. The quantitative DCF model utilizes anticipated period cash flows determined on a loan-level basis. The anticipated cash flows take into account contractual principal and interest payments, anticipated segment level prepayments, probability of defaults and historical loss given defaults. The majority of our loan classes utilize regression models to calculate probability of defaults, in which macroeconomic factors are correlated to historical quarterly defaults. The Commercial segment multi-factor models utilize a mix of 15 macroeconomic factors, including the four most commonly used factors: Real GDP, National Unemployment Rate, Disposable Personal Income and Private Inventories. The Consumer segment multi-factor models utilize a mix of three macroeconomic factors: National Unemployment Rate, Home Price Index and Disposable Income. The Company utilizes an 18 month reasonable and supportable forecast for the macroeconomic factors, after which the probability of default reverts to its historical mean using a straight-line basis constructed on each macroeconomic factor’s absolute historical quarterly change. Loans are individually measured for credit losses if they do not share similar risk characteristics of other loans within their respective pools. Individually measured loans are primarily nonaccrual and collateral dependent with balances equal to or greater than $500,000 and for which foreclosure is probable. Commercial real estate loans are secured by commercial real estate, including owner occupied and non-owner occupied commercial real estate, as well as multifamily residential real estate. Commercial business loans are primarily secured by non-real estate collateral, including equipment and other non-real estate fixed assets, inventory, receivables and cash. Agricultural loans are secured by farmland and other agricultural real estate, as well as equipment, inventory, such as crops and livestock, non-real estate fixed assets, and cash. Construction loans are secured by one-to-four family residential real estate and commercial real estate in varying stages of development. One-to-four family residential real estate loans are secured by one-to-four family residential properties. Other consumer loans are secured by personal property. For loans measured on an individual basis, the Company calculates the allowance as the difference between the amortized cost of the loan and the fair market value of the collateral. The fair market value of the collateral is determined by either the discounted expected future cash flows from the operation of the collateral or the appraised value of the collateral, less costs to sell. If the fair value of the collateral is greater than the amortized cost of the loan, no reserve is recorded. The Company also records an allowance for credit losses on unfunded loan commitments and letters of credit. We estimate expected credit losses on unfunded commitments in which we are exposed to credit risk, unless we have the option to unconditionally cancel the obligation. Expected credit losses are calculated based on the likelihood that funding will occur and an estimate of what will be funded by analyzing the most recent four-quarter utilization rates, current utilization and our quantitative ACL rate. The allowance for unfunded commitments and letters of credit is included in “Other Liabilities” on the Consolidated Balance Sheets, with changes to the balance being charged to noninterest expense. We do not measure an allowance for credit losses on accrued interest receivable balances because these balances are written-off in a timely manner as a reduction to interest income when loans are placed on nonaccrual status. The following tables show a detailed analysis of the ACL for the periods indicated: Beginning Balance Charge-offs Recoveries Provision Ending Balance Three Months Ended June 30, 2021 (in thousands) Commercial loans: Commercial real estate $ 57,050 $ (316) $ 16 $ (3,500) $ 53,250 Commercial business 58,405 (971) 874 (754) 57,554 Agriculture 9,487 (122) 5 (1,450) 7,920 Construction 6,551 — 521 (513) 6,559 Consumer loans: One-to-four family residential real estate 15,638 (146) 503 524 16,519 Other consumer 1,163 (385) 215 193 1,186 Total $ 148,294 $ (1,940) $ 2,134 $ (5,500) $ 142,988 Beginning Balance Charge-offs Recoveries Provision Ending Balance Six Months Ended June 30, 2021 (in thousands) Commercial loans: Commercial real estate $ 68,934 $ (316) $ 52 $ (15,420) $ 53,250 Commercial business 45,250 (4,310) 4,088 12,526 57,554 Agriculture 9,052 (122) 17 (1,027) 7,920 Construction 7,636 — 567 (1,644) 6,559 Consumer loans: One-to-four family residential real estate 16,875 (146) 554 (764) 16,519 Other consumer 1,393 (512) 276 29 1,186 Total $ 149,140 $ (5,406) $ 5,554 $ (6,300) $ 142,988 Beginning Balance Charge-offs Recoveries Provision Ending Balance Three Months Ended June 30, 2020 (in thousands) Commercial loans: Commercial real estate $ 37,122 $ — $ 13 $ 13,098 $ 50,233 Commercial business 45,570 (5,442) 811 12,247 53,186 Agriculture 11,085 — 1 3,782 14,868 Construction 8,845 — 235 (1,127) 7,953 Consumer loans: One-to-four family residential real estate 17,659 — 422 5,630 23,711 Other consumer 1,644 (198) 130 19 1,595 Unallocated 149 — — (149) — Total $ 122,074 $ (5,640) $ 1,612 $ 33,500 $ 151,546 Beginning Balance Impact of Adopting ASC 326 Charge-offs Recoveries Provision Ending Balance Six Months Ended June 30, 2020 (in thousands) Commercial loans: Commercial real estate $ 20,340 $ 7,533 $ (101) $ 27 $ 22,434 $ 50,233 Commercial business 30,292 762 (7,126) 1,671 27,587 53,186 Agriculture 15,835 (9,325) (4,726) 42 13,042 14,868 Construction 8,571 (1,750) — 677 455 7,953 Consumer loans: One-to-four family residential real estate 7,435 4,237 (10) 704 11,345 23,711 Other consumer 883 778 (466) 254 146 1,595 Unallocated 612 (603) — — (9) — Total 83,968 1,632 (12,429) 3,375 75,000 151,546 The $6.2 million decrease in the ACL at June 30, 2021 compared to the ACL at December 31, 2020 was primarily due to a slight improvement in the economic outlook, which remains impacted by the COVID-19 pandemic and its impact on our borrowers. Specifically regarding the forecast used in the June 30, 2021 estimate, management expects the forecasted national unemployment rate to return to pre-pandemic levels in 2023. Additionally, the commercial real estate index decline is expected to continue through 2021, followed by a slight increase in 2022. The home price index is projected to moderate over the forecast period and real GDP growth is projected to continue to be above average during this time. The models used for calculating the ACL are sensitive to changes in these and other economic factors, which could result in volatility as these assumptions change over time. The ACL at June 30, 2021 does not include a reserve for the PPP loans as these loans are fully guaranteed by the SBA. Changes in the allowance for unfunded commitments and letters of credit, a component of “Other liabilities” in the Consolidated Balance Sheets, are summarized as follows: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Beginning balance $ 9,800 $ 6,000 $ 8,300 $ 3,430 Impact of adopting ASC 326 — — — 1,570 Net changes in the allowance for unfunded commitments and letters of credit 200 2,800 1,700 3,800 Ending balance $ 10,000 $ 8,800 $ 10,000 $ 8,800 Credit Quality Indicators The extension of credit in the form of loans or other credit products to consumer and commercial clients is one of our principal business activities. Our policies and applicable laws and regulations require risk analysis as well as ongoing portfolio and credit management. We manage our credit risk through lending limit constraints, credit review, approval policies and extensive, ongoing internal monitoring. We also manage credit risk through diversification of the loan portfolio by type of loan, type of industry and type of borrower and by limiting the aggregation of debt to a single borrower. We evaluate the credit quality of our loan portfolio using regulatory risk ratings, which are based on relevant information about the borrower’s financial condition, including current financial condition, historical payment experience, credit documentation and current economic trends. Risk ratings are reviewed and updated whenever appropriate, with more periodic reviews as the risk and dollar value of the loss on the loan increases. All loans risk rated special mention or worse with amortized costs exceeding $100,000 are reviewed at least quarterly with more frequent review for specific loans. Pass rated loans are generally considered to have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special Mention rated loans have potential weaknesses that, if left uncorrected, may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date. Loans with a risk rating of Substandard or worse are reviewed to assess the ability of our borrowers to service all interest and principal obligations and, as a result, the risk rating or accrual status may be adjusted accordingly. Loans risk rated as Substandard reflect loans where a loss is possible if loan weaknesses are not corrected. Doubtful rated loans have a high probability of loss; however, the amount of loss has not yet been determined. Loss rated loans are considered uncollectible and when identified, are charged-off. The following is an analysis of the credit quality of our loan portfolio as of the periods indicated: Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Term Loans Amortized Cost Basis by Origination Year 2021 2020 2019 2018 2017 Prior Total (1) June 30, 2021 (in thousands) Commercial loans: Commercial real estate Pass $ 389,826 $ 648,251 $ 584,280 $ 443,700 $ 452,989 $ 1,163,730 $ 57,550 $ 2,775 $ 3,743,101 Special mention 1,875 10,168 58,636 21,408 26,722 60,889 — 2,195 181,893 Substandard 507 3,917 43,600 10,882 28,362 87,655 1,154 — 176,077 Total commercial real estate $ 392,208 $ 662,336 $ 686,516 $ 475,990 $ 508,073 $ 1,312,274 $ 58,704 $ 4,970 $ 4,101,071 Commercial business Pass $ 881,501 $ 585,999 $ 325,418 $ 245,432 $ 163,134 $ 316,525 $ 980,429 $ 16,876 $ 3,515,314 Special mention — 1,243 8,311 6,293 4,955 990 43,386 251 65,429 Substandard 336 5,808 24,959 29,854 22,175 31,814 41,282 1,317 157,545 Total commercial business $ 881,837 $ 593,050 $ 358,688 $ 281,579 $ 190,264 $ 349,329 $ 1,065,097 $ 18,444 $ 3,738,288 Agriculture Pass $ 97,908 $ 95,853 $ 82,533 $ 37,066 $ 54,739 $ 102,476 $ 259,260 $ 1,744 $ 731,579 Special mention 109 4,593 738 325 64 — 4,526 — 10,355 Substandard — 6,343 10,045 1,643 3,862 2,529 30,317 907 55,646 Total agriculture $ 98,017 $ 106,789 $ 93,316 $ 39,034 $ 58,665 $ 105,005 $ 294,103 $ 2,651 $ 797,580 Construction Pass $ 115,216 $ 101,292 $ 19,352 $ 6,699 $ 3,448 $ 4,897 $ 30,302 $ 304 $ 281,510 Substandard — — 18,739 — — 54 — — 18,793 Total construction $ 115,216 $ 101,292 $ 38,091 $ 6,699 $ 3,448 $ 4,951 $ 30,302 $ 304 $ 300,303 Consumer loans: One-to-four family residential real estate Pass $ 130,355 $ 146,145 $ 58,921 $ 49,106 $ 23,838 $ 81,118 $ 227,230 $ 622 $ 717,335 Special mention — 2,350 — — 314 — — — 2,664 Substandard — 81 1,201 239 172 2,132 172 155 4,152 Total one-to-four family real estate $ 130,355 $ 148,576 $ 60,122 $ 49,345 $ 24,324 $ 83,250 $ 227,402 $ 777 $ 724,151 Other consumer Pass $ 4,289 $ 3,294 $ 2,270 $ 1,789 $ 671 $ 1,122 $ 18,006 $ 192 $ 31,633 Substandard — 25 38 — 2 2 23 — 90 Total consumer $ 4,289 $ 3,319 $ 2,308 $ 1,789 $ 673 $ 1,124 $ 18,029 $ 192 $ 31,723 Total $ 1,621,922 $ 1,615,362 $ 1,239,041 $ 854,436 $ 785,447 $ 1,855,933 $ 1,693,637 $ 27,338 $ 9,693,116 Less: Allowance for credit losses 142,988 Loans, net $ 9,550,128 __________ (1) Loans that are on short-term deferments are treated as Pass loans and will not be reported as past due provided that they are performing in accordance with the modified terms. Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Term Loans Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Total December 31, 2020 (in thousands) Commercial loans: Commercial real estate Pass $ 674,444 $ 645,328 $ 478,881 $ 502,112 $ 408,972 $ 946,980 $ 52,049 $ 11,332 $ 3,720,098 Special mention 3,348 39,374 21,285 30,232 46,197 50,115 5 2,139 192,695 Substandard 2,916 24,860 13,571 15,652 43,735 41,138 3,389 4,259 149,520 Total commercial real estate $ 680,708 $ 709,562 $ 513,737 $ 547,996 $ 498,904 $ 1,038,233 $ 55,443 $ 17,730 $ 4,062,313 Commercial business Pass $ 1,087,400 $ 366,435 $ 324,360 $ 199,010 $ 218,313 $ 214,677 $ 1,000,725 $ 11,540 $ 3,422,460 Special mention 3,002 26,361 8,471 24,582 7,004 10,650 22,426 — 102,496 Substandard 3,625 7,376 11,061 5,905 6,396 3,743 32,134 2,772 73,012 Total commercial business $ 1,094,027 $ 400,172 $ 343,892 $ 229,497 $ 231,713 $ 229,070 $ 1,055,285 $ 14,312 $ 3,597,968 Agriculture Pass $ 142,163 $ 90,612 $ 44,434 $ 58,366 $ 58,893 $ 59,396 $ 244,135 $ 9,299 $ 707,298 Special mention — 90 285 33 — — 85 13 506 Substandard 5,193 12,480 5,868 4,258 284 3,502 38,780 1,458 71,823 Total agriculture $ 147,356 $ 103,182 $ 50,587 $ 62,657 $ 59,177 $ 62,898 $ 283,000 $ 10,770 $ 779,627 Construction Pass $ 134,693 $ 66,974 $ 10,066 $ 3,498 $ 763 $ 1,805 $ 29,323 $ 3,753 $ 250,875 Substandard — 17,732 — — — 56 — — 17,788 Total construction $ 134,693 $ 84,706 $ 10,066 $ 3,498 $ 763 $ 1,861 $ 29,323 $ 3,753 $ 268,663 Consumer loans: One-to-four family real estate Pass $ 161,021 $ 77,756 $ 62,696 $ 29,737 $ 20,889 $ 78,098 $ 243,325 $ 3,655 $ 677,177 Special mention — — 332 — — 195 — — 527 Substandard — 849 227 1,166 344 1,968 1,005 307 5,866 Total one-to-four family real estate $ 161,021 $ 78,605 $ 63,255 $ 30,903 $ 21,233 $ 80,261 $ 244,330 $ 3,962 $ 683,570 Other consumer Pass $ 5,548 $ 3,109 $ 3,886 $ 989 $ 244 $ 1,060 $ 19,911 $ 474 $ 35,221 Substandard 30 — — 5 — 170 53 40 298 Total consumer $ 5,578 $ 3,109 $ 3,886 $ 994 $ 244 $ 1,230 $ 19,964 $ 514 $ 35,519 Total $ 2,223,383 $ 1,379,336 $ 985,423 $ 875,545 $ 812,034 $ 1,413,553 $ 1,687,345 $ 51,041 $ 9,427,660 Less: Allowance for credit losses 149,140 Loans, net $ 9,278,520

Other Real Estate Owned

Other Real Estate Owned	6 Months Ended
	Jun. 30, 2021
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other Real Estate Owned	Other Real Estate Owned The following tables set forth activity in OREO for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Balance, beginning of period $ 521 $ 510 $ 553 $ 552 Transfers in — 558 — 558 Valuation adjustments (140) — (140) — Proceeds from sale of OREO property — (303) (132) (345) Gain (loss) on sale of OREO, net — (18) 100 (18) Balance, end of period $ 381 $ 747 $ 381 $ 747 At June 30, 2021, there were no foreclosed residential real estate properties held as OREO. The recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $166 thousand.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Other Intangible Assets In accordance with the Intangibles – Goodwill and Other topic of the FASB ASC, goodwill is not amortized but is reviewed for potential impairment at the reporting unit level. Management analyzes its goodwill for impairment on an annual basis on July 31 and between annual tests in certain circumstances such as material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. Our CDIs are evaluated for impairment if events and circumstances indicate a possible impairment. Each CDI is amortized on an accelerated basis over an estimated life of 10 years. The following table sets forth activity for goodwill and other intangible assets for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Goodwill Total goodwill $ 765,842 $ 765,842 $ 765,842 $ 765,842 Other intangible assets, net CDI: Gross CDI balance at beginning of period 105,473 105,473 105,473 105,473 Accumulated amortization at beginning of period (81,582) (73,244) (79,658) (70,934) CDI, net at beginning of period 23,891 32,229 25,815 34,539 CDI current period amortization (1,852) (2,210) (3,776) (4,520) Total CDI, net at end of period 22,039 30,019 22,039 30,019 Intangible assets not subject to amortization 919 919 919 919 Other intangible assets, net at end of period 22,958 30,938 22,958 30,938 Total goodwill and other intangible assets at end of period $ 788,800 $ 796,780 $ 788,800 $ 796,780 The following table provides the estimated future amortization expense of our CDI for the remaining six months ending December 31, 2021 and the succeeding four years: Year ending December 31, (in thousands) 2021 $ 3,488 2022 5,880 2023 4,552 2024 3,432 2025 2,415

Revolving Line of Credit

Revolving Line of Credit	6 Months Ended
	Jun. 30, 2021
Line of Credit [Member]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	Revolving Line of CreditThe Company has a $15.0 million short-term credit facility with an unaffiliated bank, for which the term was extended through May 26, 2022 as a result of an amendment executed during the second quarter of 2021. This facility has a variable interest rate and provides the Company additional liquidity, if needed, for various corporate activities including the repurchase of shares of Columbia Banking System, Inc. common stock. There was no outstanding balance at both June 30, 2021 and December 31, 2020. The credit agreement requires the Company to comply with certain covenants including those related to asset quality and capital levels. The Company was in compliance with all covenants associated with this facility at June 30, 2021.

Derivatives and Balance Sheet O

Derivatives and Balance Sheet Offsetting	6 Months Ended
	Jun. 30, 2021
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Derivatives and Hedging Activities	Derivatives, Hedging Activities and Balance Sheet Offsetting The Company is exposed to certain risks arising from both its business and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of its assets and liabilities and the use of derivative financial instruments. Specifically, the Company enters into interest rate-based derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s loan portfolio. The Company’s objectives in using interest rate derivatives are to add stability to interest income and to manage its exposure to interest rate movements. To accomplish this objective, the Company used an interest rate collar as part of its interest rate risk management strategy. Interest rate collars designated as cash flow hedges involve the payments of variable-rate amounts if interest rates rise above the cap strike rate on the contract and receipts of variable-rate amounts if interest rates fall below the floor strike rate on the contract. These derivative contracts were used to hedge the variable cash flows associated with existing variable-rate assets. With respect to derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in accumulated other comprehensive income (loss) and subsequently reclassified into interest income in the same period(s) during which the hedged transaction affects earnings. Amounts reported in accumulated other comprehensive income (loss) related to derivatives are reclassified to interest income as interest payments are received on the Company’s variable-rate assets. During the next 12 months, the Company estimates that there will be $10.4 million reclassified as an increase to interest income. The Company may use derivatives to hedge the risk or changes in the fair values of interest rate lock commitments and residential mortgage loans held for sale. These derivatives are not designated as hedging instruments. Rather, they are accounted for as free-standing derivatives, or economic hedges, with changes in the fair value of the derivatives reported in income. The Company primarily utilizes interest rate forward loan sales contracts in its derivative risk management strategy. The Company enters into forward delivery contracts to sell residential mortgage loans to broker-dealers at specific prices and dates in order to hedge the interest rate risk in its portfolio of mortgage loans held for sale and its residential mortgage interest rate lock commitments. Credit risk associated with forward contracts is limited to the replacement cost of those forward contracts in a gain position. There were no counterparty default losses on forward contracts during the three and six months ended June 30, 2021 and 2020. Market risk with respect to forward contracts arises principally from changes in the value of contractual positions due to changes in interest rates. The Bank limits its exposure to market risk by monitoring differences between commitments to customers and forward contracts with broker-dealers. In the event the Company has forward delivery contract commitments in excess of available mortgage loans, the Company completes the transaction by either paying or receiving a fee to or from the broker-dealer equal to the increase or decrease in the market value of the forward contract. At June 30, 2021 and December 31, 2020, the Bank had commitments to originate mortgage loans held for sale totaling $26.9 million and $31.9 million, respectively, and forward sales commitments of $21.5 million and $26.5 million, respectively, which are used to hedge both on-balance sheet and off-balance sheet exposures. In addition, the Company periodically enters into certain commercial loan interest rate swap agreements in order to provide commercial loan customers the ability to convert from variable to fixed interest rates. Under these agreements, the Company enters into a variable-rate loan agreement with a customer in addition to a swap agreement. This swap agreement effectively converts the customer’s variable rate loan into a fixed rate. The Company then enters into a corresponding swap agreement with a third-party in order to offset its exposure on the variable and fixed components of the customer agreement. As the interest rate swap agreements with the customers and third parties are not designated as hedges under the Derivatives and Hedging topic of the FASB ASC, the instruments are marked to market in earnings. The notional amount of open interest rate swap agreements at June 30, 2021 and December 31, 2020 was $605.1 million and $597.9 million, respectively. The following table presents the fair value of derivatives, as well as their classification on the Consolidated Balance Sheet as of the dates presented: Asset Derivatives Liability Derivatives June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value (in thousands) Derivatives not designated as hedging instruments: Interest rate lock commitments Other assets $ 585 Other assets $ 1,096 Other liabilities $ — Other liabilities $ — Interest rate forward loan sales contracts Other assets $ — Other assets $ — Other liabilities $ 23 Other liabilities $ 165 Interest rate swap contracts Other assets $ 32,546 Other assets $ 46,184 Other liabilities $ 32,853 Other liabilities $ 46,637 The table below presents the effect of cash flow hedge accounting on accumulated other comprehensive income (loss) for the periods indicated: Amount of Gain or (Loss) Recognized in Accumulated Other Comprehensive Income on Derivative Location of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Three Months Ended June 30, Three Months Ended June 30, 2021 2020 2021 2020 (in thousands) Interest rate collar $ — $ 3,402 Interest income $ 2,602 $ 2,190 Six Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest rate collar $ — $ 26,825 Interest income $ 5,178 $ 3,130 In January 2019, the Company entered into a $500.0 million notional interest rate collar with a five-year term. In October 2020, the collar was terminated and resulted in a $34.4 million realized gain that was recorded in accumulated other comprehensive income, net of deferred income taxes. The gain will amortize through February 2024 into interest income. The gain will be amortized in this manner as long as the cash flows pertaining to the hedged item are expected to occur. The following table summarizes the types of derivatives not designated as hedging instruments and the gains (losses) recorded during the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Interest rate lock commitments $ (340) $ — $ (511) $ — Interest rate forward loan sales contracts (527) — 143 — Interest rate swap contracts (40) (473) 72 (473) Total derivative gains (losses) $ (907) $ (473) $ (296) $ (473) The gains and losses on the Company’s mortgage banking derivatives are included in loan revenue. Mark-to-market gains and losses on the Company’s interest rate swap contracts are recorded to “Other” noninterest expense. The Company is party to interest rate swap contracts and repurchase agreements that are subject to enforceable master netting arrangements or similar agreements. Under these agreements, the Company may have the right to net settle multiple contracts with the same counterparty. The following tables show the gross interest rate swap contracts, collar agreements and repurchase agreements in the Consolidated Balance Sheets and the respective collateral received or pledged in the form of cash or other financial instruments. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of over-collateralization are not shown. Gross Amounts of Recognized Assets/Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheets Collateral Pledged/Received Net Amount June 30, 2021 (in thousands) Assets Interest rate swap contracts $ 32,546 $ — $ 32,546 $ (430) $ 32,116 Liabilities Interest rate swap contracts $ 32,853 $ — $ 32,853 $ (30,167) $ 2,686 Repurchase agreements $ 70,994 $ — $ 70,994 $ (70,994) $ — December 31, 2020 Assets Interest rate swap contracts $ 46,184 $ — $ 46,184 $ — $ 46,184 Liabilities Interest rate swap contracts $ 46,637 $ — $ 46,637 $ (46,637) $ — Repurchase agreements $ 73,859 $ — $ 73,859 $ (73,859) $ — The Company’s agreements with each of its derivative counterparties provide that if the Company defaults or is capable of being declared in default on any of its indebtedness, then the Company could also be declared in default on its derivative obligations. The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements: Remaining contractual maturity of the agreements Overnight and continuous Up to 30 days 30 - 90 days Greater than 90 days Total June 30, 2021 (in thousands) Class of collateral pledged for repurchase agreements U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 70,994 $ — $ — $ — $ 70,994 Gross amount of recognized liabilities for repurchase agreements 70,994 Amounts related to agreements not included in offsetting disclosure $ —

Commitments and contingent liab

Commitments and contingent liabilities	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Commitments and Contingent Liabilities Lease Commitments: The Company’s lease commitments consist primarily of leased locations under various non-cancellable operating leases that expire between 2021 and 2043. The majority of the leases contain renewal options and provisions for increases in rental rates based on an agreed upon index or predetermined escalation schedule. Financial Instruments with Off-Balance Sheet Risk: In the normal course of business, the Company makes loan commitments (typically unfunded loans and unused lines of credit) and issues standby letters of credit to accommodate the financial needs of its customers. At June 30, 2021 and December 31, 2020, the Company’s loan commitments amounted to $3.04 billion and $2.80 billion, respectively. Standby letters of credit commit the Company to make payments on behalf of customers under specified conditions. Historically, no significant losses have been incurred by the Company under standby letters of credit. Both arrangements have credit risk essentially the same as that involved in extending loans to customers and are subject to the Company’s normal credit policies, including collateral requirements, where appropriate. Standby letters of credit were $24.7 million and $29.9 million at June 30, 2021 and December 31, 2020, respectively. Legal Proceedings: The Company and its subsidiaries are from time to time defendants in and are threatened with various legal proceedings arising from their regular business activities. Management, after consulting with legal counsel, is of the opinion that the ultimate liability, if any, resulting from these pending or threatened actions and proceedings will not have a material effect on the financial statements of the Company.

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2021
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Dividends: The following table summarizes year-to-date dividend activity: Declared Regular Cash Dividends Per Common Share Record Date Paid Date January 28, 2021 $ 0.28 February 10, 2021 February 24, 2021 April 29, 2021 $ 0.28 May 12, 2021 May 26, 2021 Subsequent to quarter end, on July 29, 2021, the Company declared a regular quarterly cash dividend of $0.28 per common share payable on August 25, 2021 to shareholders of record at the close of business on August 11, 2021. The payment of cash dividends is subject to federal regulatory requirements for capital levels and other restrictions. In addition, the cash dividends paid by Columbia Bank to the Company are subject to both federal and state regulatory requirements. Share Repurchase Program: For the three and six months ended June 30, 2021, the Company did not purchase any common shares under the share repurchase program.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table shows changes in accumulated other comprehensive income (loss) by component for the periods indicated: Unrealized Gains and Losses on Available for Sale Securities (1) Unrealized Gains and Losses on Pension Plan Liability (1) Unrealized Gains and Losses on Hedging Instruments (1) Total (1) Three Months Ended June 30, 2021 (in thousands) Beginning balance $ 60,569 $ (5,718) $ 22,877 $ 77,728 Other comprehensive income (loss) before reclassifications 21,850 — — 21,850 Amounts reclassified from accumulated other comprehensive income (2) (586) 115 (1,998) (2,469) Net current-period other comprehensive income (loss) 21,264 115 (1,998) 19,381 Ending balance $ 81,833 $ (5,603) $ 20,879 $ 97,109 Three Months Ended June 30, 2020 Beginning balance $ 112,543 $ (3,894) $ 28,558 $ 137,207 Other comprehensive income before reclassifications 42,860 — 2,611 45,471 Amounts reclassified from accumulated other comprehensive income (2) — 79 (1,680) (1,601) Net current-period other comprehensive income 42,860 79 931 43,870 Ending balance $ 155,403 $ (3,815) $ 29,489 $ 181,077 Six Months Ended June 30, 2021 Beginning balance $ 163,174 $ (5,833) $ 24,854 $ 182,195 Other comprehensive income (loss) before reclassifications (80,755) — — (80,755) Amounts reclassified from accumulated other comprehensive income (2) (586) 230 (3,975) (4,331) Net current-period other comprehensive income (loss) (81,341) 230 (3,975) (85,086) Ending balance $ 81,833 $ (5,603) $ 20,879 $ 97,109 Six Months Ended June 30, 2020 Beginning balance $ 33,038 $ (3,974) $ 11,303 $ 40,367 Other comprehensive income before reclassifications 122,556 — 20,588 143,144 Amounts reclassified from accumulated other comprehensive income (2) (191) 159 (2,402) (2,434) Net current-period other comprehensive income 122,365 159 18,186 140,710 Ending balance $ 155,403 $ (3,815) $ 29,489 $ 181,077 __________ (1) All amounts are net of tax. Amounts in parentheses indicate debits. (2) See following table for details about these reclassifications. The following table shows details regarding the reclassifications from accumulated other comprehensive income (loss) for the periods indicated: Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Three Months Ended June 30, Six Months Ended June 30, Affected line Item in the Consolidated 2021 2020 2021 2020 Statement of Income (in thousands) Unrealized gains on available for sale debt securities $ 314 $ — $ 314 $ 249 Investment securities gains, net Amortization of unrealized gains related to securities transfer 450 — 450 — Loan interest income 764 — 764 249 Total before tax (178) — (178) (58) Income tax provision $ 586 $ — $ 586 $ 191 Net of tax Amortization of pension plan liability actuarial losses $ (149) $ (103) $ (299) $ (207) Compensation and employee benefits (149) (103) (299) (207) Total before tax 34 24 69 48 Income tax provision $ (115) $ (79) $ (230) $ (159) Net of tax Unrealized gains from hedging instruments $ 2,602 $ 2,190 $ 5,178 $ 3,130 Loans 2,602 2,190 5,178 3,130 Total before tax (604) (510) (1,203) (728) Income tax provision $ 1,998 $ 1,680 $ 3,975 $ 2,402 Net of tax

Fair Value Accounting and Measu

Fair Value Accounting and Measurement	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Accounting and Measurement	Fair Value Accounting and Measurement The Fair Value Measurements and Disclosures topic of the FASB ASC defines fair value, establishes a consistent framework for measuring fair value and expands disclosure requirements about fair value. We hold fixed and variable rate interest-bearing securities, investments in marketable equity securities and certain other financial instruments, which are carried at fair value. Fair value is determined based upon quoted prices when available or through the use of alternative approaches, such as matrix or model pricing, when market quotes are not readily accessible or available. The valuation techniques are based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own market assumptions. These two types of inputs create the following fair value hierarchy: Level 1 – Quoted prices for identical instruments in active markets that are accessible at the measurement date. Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model derived valuations whose inputs are observable or whose significant value drivers are observable. Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable. Fair values are determined as follows: Debt securities at fair value are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors. These fair value calculations are considered a Level 2 input method under the provisions of the Fair Value Measurements and Disclosures topic of the FASB ASC for all debt securities. Loans held for sale include the fair value of residential mortgage loans originated as held for sale determined based on quoted secondary market prices for similar loans, including the implicit fair value of embedded servicing rights. The change in fair value of loans held for sale is primarily driven by changes in interest rates subsequent to loan funding and changes in the fair value of the related servicing asset, resulting in revaluation adjustments to the recorded fair value. The fair values of the interest rate lock commitments and interest rate forward loan sales contracts are estimated using quoted or published market prices for similar instruments, adjusted for factors such as pull-through rate assumptions based on historical information, where appropriate. The pull-through rate assumptions are considered Level 3 valuation inputs and are significant to the interest rate lock commitment valuation; as such, the interest rate lock commitment derivatives are classified as Level 3. Interest rate contracts and the interest rate collar are valued in models, which use as their basis, readily observable market parameters and are classified within Level 2 of the valuation hierarchy. The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at the dates presented by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement: Fair Value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 June 30, 2021 (in thousands) Assets Debt securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 2,737,200 $ — $ 2,737,200 $ — Other asset-backed securities 432,314 — 432,314 — State and municipal securities 764,060 — 764,060 — U.S. government agency and government-sponsored enterprise securities 256,492 — 256,492 — Total debt securities available for sale $ 4,190,066 $ — $ 4,190,066 $ — Loans held for sale $ 14,413 $ — $ 14,413 $ — Other assets: Interest rate lock commitments $ 585 $ — $ — $ 585 Interest rate contracts $ 32,546 $ — $ 32,546 $ — Liabilities Other liabilities: Interest rate forward loan sales contracts $ 23 $ — $ 23 $ — Interest rate contracts $ 32,853 $ — $ 32,853 $ — Fair Value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 December 31, 2020 (in thousands) Assets Debt securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 3,814,387 $ — $ 3,814,387 $ — Other asset-backed securities 357,479 — 357,479 — State and municipal securities 753,572 — 753,572 — U.S. government agency and government-sponsored enterprise securities 284,696 — 284,696 — Total debt securities available for sale $ 5,210,134 $ — $ 5,210,134 $ — Loans held for sale $ 14,760 $ — $ 14,760 $ — Other assets: Interest rate lock commitments $ 1,096 $ — $ — $ 1,096 Interest rate contracts $ 46,184 $ — $ 46,184 $ — Liabilities Other liabilities: Interest rate forward loan sales contracts $ 165 $ — $ 165 $ — Interest rate contracts $ 46,637 $ — $ 46,637 $ — Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) The following table provides a description of the valuation technique, significant unobservable inputs, and qualitative information about the unobservable inputs for the Company’s assets and liabilities classified as Level 3 and measured at fair value on a recurring basis at the dates presented: Fair Value at June 30, 2021 Valuation Technique Unobservable Input Range (Weighted Average) (dollars in thousands) Interest rate lock commitments $ 585 Internal pricing model Pull-through rate 78.50% - 98.53% (88.89%) An increase in the pull-through rate utilized in the fair value measurement of the interest rate lock commitment derivative will result in positive fair value adjustments (and an increase in the fair value measurement). Conversely, a decrease in the pull-through rate will result in a negative fair value adjustment (and a decrease in the fair value measurement). The following table includes a rollforward of interest rate lock commitments which utilize Level 3 inputs to determine the fair value on a recurring basis. Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Balance at the beginning of the period $ 925 $ — $ 1,096 $ — Change included in earnings 2,134 — 3,844 — Settlements (2,474) — (4,355) — Balance at the end of the period $ 585 $ — $ 585 $ — Nonrecurring Measurements Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as collateral dependent loans. The following valuation techniques and inputs were used to estimate the fair value of collateral dependent loans and equity securities without readily determinable fair value. Collateral dependent loans - A collateral dependent loan is a loan in which repayment is expected to be provided solely by the underlying collateral. The fair market value of the collateral is determined by either the discounted expected future cash flows from the operation of the collateral or the appraised value of the collateral, less costs to sell. The collateral dependent loan valuations are performed in conjunction with the allowance for credit losses process on a quarterly basis. Equity securities without readily determinable fair value - The Company measures equity securities without readily determinable fair values at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer, with such changes recognized in earnings. Our equity securities without readily determinable fair values consist of 77,683 Visa Class B shares. These shares are currently subject to certain transfer restrictions and will be convertible into Visa Class A shares upon final resolution of certain litigation matters involving Visa. For additional information, please see Note 3 of this report. OREO - OREO is real property that the Bank has taken ownership of in partial or full satisfaction of a loan or loans. OREO is generally measured based on the property’s fair market value as indicated by an appraisal or a letter of intent to purchase. OREO is initially recorded at the fair value less estimated costs to sell. This amount becomes the property’s new basis. Any fair value adjustments based on the property’s fair value less estimated costs to sell at the date of acquisition are charged to the allowance for credit losses, or in the event of a write-up without previous losses charged to the allowance for credit losses, a credit to earnings is recorded. Management periodically reviews OREO in an effort to ensure the property is recorded at its fair value, net of estimated costs to sell. Any fair value adjustments subsequent to acquisition are charged or credited to earnings. The following table presents the carrying value of equity securities, without readily determinable fair values, still held as of June 30, 2021, that are measured under the measurement alternative and related adjustments recorded during the periods presented for those securities with observable price changes. These securities are included in the nonrecurring fair value tables when applicable price changes are observable. Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 Equity securities without readily determinable fair values (in thousands) Carrying value, beginning of period $ 13,425 $ — $ 13,425 $ — Upward carrying value changes — 13,425 — 13,425 Carrying value, end of period $ 13,425 $ 13,425 $ 13,425 $ 13,425 The following tables set forth information related to the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the current and prior year quarterly periods: Fair Value at June 30, 2021 Fair Value Measurements Losses During the Three Months Ended June 30, 2021 Losses During the Six Months Ended June 30, 2021 Level 1 Level 2 Level 3 (in thousands) Collateral dependent loans $ 4,331 $ — $ — $ 4,331 $ 383 $ 383 OREO $ 375 $ — $ — $ 375 $ 140 $ 140 Fair Value at June 30, 2020 Fair Value Measurements Gains (Losses) During the Three Months Ended June 30, 2020 Gains (Losses) During the Six Months Ended June 30, 2020 Level 1 Level 2 Level 3 (in thousands) Collateral dependent loans $ 7,976 $ — $ — $ 7,976 $ (6,946) $ (7,745) Equity securities $ 13,425 $ — $ — $ 13,425 $ 13,425 $ 13,425 The losses on collateral dependent loans disclosed above represent the amount of the allowance for credit losses and/or charge-offs during the period applicable to loans held at period-end. The amount of the allowance is included in the ACL. The losses on OREO disclosed above represent the write-downs taken at foreclosure that were charged to the ACL as well as subsequent changes in valuation allowances from updated appraisals that were recorded to earnings. Quantitative information about Level 3 fair value measurements The range and weighted average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets, along with the valuation techniques used, are shown in the following table: Fair Value at June 30, 2021 Valuation Technique Unobservable Input Range (Weighted Average) (1) (dollars in thousands) Collateral dependent loans (2) $ 4,331 Fair Market Value of Collateral Adjustment to Stated Value 0.00% - 31.00% (3.67%) __________ (1) Discount applied to appraised value or stated value (in the case of fixed and intangible assets). (2) Collateral consists of intangible assets, fixed assets and real estate. Fair Value at June 30, 2020 Valuation Technique Unobservable Input Range (Weighted Average) (1) (dollars in thousands) Collateral dependent loans (2) $ 7,976 Fair Market Value of Collateral Adjustment to Stated Value 0.00% - 100.00% (56.22%) __________ (1) Discount applied to appraised value or stated value (in the case of accounts receivable, fixed assets and inventory). (2) Collateral consists of cash, accounts receivable, fixed assets, inventory and real estate. The following tables summarize carrying amounts and estimated fair values of selected financial instruments by level within the fair value hierarchy at the dates presented: June 30, 2021 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 218,649 $ 218,649 $ 218,649 $ — $ — Interest-earning deposits with banks 612,883 612,883 612,883 — — Debt securities available for sale 4,190,066 4,190,066 — 4,190,066 — Debt securities held to maturity 2,024,715 2,032,980 — 2,032,980 — FHLB stock 10,280 10,280 — 10,280 — Loans held for sale 13,179 13,179 — 13,179 — Loans 9,550,128 9,955,668 — — 9,955,668 Interest rate contracts 32,546 32,546 — 32,546 — Interest rate lock commitments 585 585 — — 585 Liabilities Time deposits $ 327,882 $ 326,735 $ — $ 326,735 $ — FHLB advances 7,386 8,878 — 8,878 — Repurchase agreements 70,994 70,994 — 70,994 — Subordinated debentures 35,000 35,171 — 35,171 — Interest rate contracts 32,853 32,853 — 32,853 — Interest rate forward loan sales contracts 23 23 — 23 — December 31, 2020 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 218,899 $ 218,899 $ 218,899 $ — $ — Interest-earning deposits with banks 434,867 434,867 434,867 — — Debt securities available for sale 5,210,134 5,210,134 — 5,210,134 — FHLB stock 10,280 10,280 — 10,280 — Loans held for sale 26,481 26,481 — 26,481 — Loans 9,278,520 9,720,592 — — 9,720,592 Interest rate contracts 46,184 46,184 — 46,184 — Interest rate lock commitments 1,096 1,096 — — 1,096 Liabilities Time deposits $ 338,845 $ 338,815 $ — $ 338,815 $ — FHLB advances and FRB borrowings 7,414 9,295 — 9,295 — Repurchase agreements 73,859 73,859 — 73,859 — Subordinated debentures 35,092 35,414 — 35,414 — Interest rate contracts 46,637 46,637 — 46,637 — Interest rate forward loan sales contracts 165 165 — 165 — The following table presents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans held for sale sold under the mandatory delivery method and accounted for under the fair value option as of the dates presented: June 30, 2021 December 31, 2020 Fair Value Aggregate Unpaid Principal Balance Fair Value Less Aggregate Unpaid Principal Balance Fair Value Aggregate Unpaid Principal Balance Fair Value Less Aggregate Unpaid Principal Balance (in thousands) $ 14,413 $ 14,050 $ 363 $ 14,760 $ 14,252 $ 508 Residential mortgage loans held for sale that are sold under the mandatory delivery method and accounted for under the fair value option are measured initially at fair value with subsequent changes in fair value recognized in earnings. Gains and losses from such changes in fair value are reported in loan revenue. For the three and six months ended June 30, 2021, the Company recorded net decreases in fair value of $57 thousand and $145 thousand, respectively, representing the change in fair value reflected in earnings. For the three and six months ended June 30, 2020, there were no such loans held for sale under the mandatory delivery method. At June 30, 2021 and December 31, 2020, there were no residential mortgage loans held for sale for which the fair value option was elected that were 90 days or more past due, in nonaccrual status or both.

Earnings per Common Share

Earnings per Common Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share The Company applies the two-class method of computing basic and diluted EPS. Under the two-class method, EPS is determined for each class of common stock and participating security according to dividends declared and participation rights in undistributed earnings. The Company has issued restricted shares under share-based compensation plans which qualify as participating securities. The following table sets forth the computation of basic and diluted EPS for the periods presented: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands except per share amounts) Basic EPS: Net income $ 55,039 $ 36,582 $ 106,892 $ 51,210 Less: Earnings allocated to participating securities: Nonvested restricted shares 70 139 227 325 Earnings allocated to common shareholders $ 54,969 $ 36,443 $ 106,665 $ 50,885 Weighted average common shares outstanding 70,987 70,679 70,924 70,942 Basic earnings per common share $ 0.77 $ 0.52 $ 1.50 $ 0.72 Diluted EPS: Earnings allocated to common shareholders $ 54,969 $ 36,443 $ 106,665 $ 50,885 Weighted average common shares outstanding 70,987 70,679 70,924 70,942 Dilutive effect of equity awards 177 32 155 39 Weighted average diluted common shares outstanding 71,164 70,711 71,079 70,981 Diluted earnings per common share $ 0.77 $ 0.52 $ 1.50 $ 0.72 Potentially dilutive RSAs and RSUs that were not included in the computation of diluted EPS because to do so would be anti-dilutive 248 571 158 450

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers Revenue in the scope of Topic 606, Revenue from Contracts with Customers is measured based on the consideration specified in the contract with a customer and excludes amounts collected on behalf of third parties. The vast majority of the Company’s revenue is specifically outside the scope of Topic 606. For in-scope revenue, the following is a description of principal activities, separated by the timing of revenue recognition from which the Company generates its revenue from contracts with customers. a. Revenue earned at a point in time - Examples of revenue earned at a point in time are ATM transaction fees, wire transfer fees, overdraft fees, interchange fees and foreign exchange transaction fees. Revenue is primarily based on the number and type of transactions and is generally derived from transactional information accumulated by our systems and is recognized immediately as the transactions occur or upon providing the service to complete the customer’s transaction. The Company is the principal in each of these contracts, with the exception of interchange fees, in which case we are acting as the agent and record revenue net of expenses paid to the principal. b. Revenue earned over time - The Company earns revenue from contracts with customers in a variety of ways where the revenue is earned over a period of time - generally monthly. Examples of this type of revenue are deposit account maintenance fees, investment advisory fees, merchant revenue and safe deposit box fees. Revenue is generally derived from transactional information accumulated by our systems or those of third-parties and is recognized as the related transactions occur or services are rendered to the customer. The Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered and our contracts generally do not include multiple performance obligations. As a result, there are no contract balances as payments and services are rendered simultaneously. Payment is generally collected at the time services are rendered, monthly or quarterly. Unsatisfied performance obligations at the report date are not material to our Consolidated Financial Statements. In certain cases, other parties are involved with providing products and services to our customers. If the Company is principal in the transaction (providing goods or services itself), revenues are reported based on the gross consideration received from the customer and any related expenses are reported gross in noninterest expense. If the Company is an agent in the transaction (arranging for another party to provide goods or services), the Company reports its net fee or commission retained as revenue. Rebates, waivers and reversals are recorded as a reduction of the transaction price either when the revenue is recognized by the Company or at the time the rebate, waiver or reversal is earned by the customer. Practical expedients The Company applies the practical expedient in paragraph 606-10-32-18 and does not adjust the consideration from customers for the effects of a significant financing component if at contract inception the period between when the entity transfers the goods or services and when the customer pays for that good or service will be one year or less. The Company pays sales commissions to its employees in accordance with certain incentive plans and in connection with obtaining certain contracts with customers. The Company applies the practical expedient in paragraph 340-40-25-4 and expenses such sales commissions when incurred if the amortization period of the asset the Company otherwise would have recognized is one year or less. Sales commissions are included in compensation and employee benefits expense. For the Company’s contracts that have an original expected duration of one year or less, the Company uses the practical expedient in paragraph 606-10-50-14 and has not disclosed the amount of the transaction price allocated to unsatisfied performance obligations as of the end of each reporting period or when the Company expects to recognize this revenue. Disaggregation of revenue The following table shows the disaggregation of revenue from contracts with customers for the periods presented: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Noninterest income: Revenue from contracts with customers: Deposit account and treasury management fees $ 6,701 $ 6,092 $ 13,059 $ 13,880 Card revenue 4,773 3,079 8,506 6,597 Financial services and trust revenue 4,245 3,163 7,626 6,228 Total revenue from contracts with customers 15,719 12,334 29,191 26,705 Other sources of noninterest income 7,011 24,925 16,705 31,761 Total noninterest income $ 22,730 $ 37,259 $ 45,896 $ 58,466

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Schedule of available-for-sale securities and held-to-maturity securities	The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of debt securities: Amortized Gross Gross Fair Value June 30, 2021 (in thousands) Available for sale U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 2,671,827 $ 74,715 $ (9,342) $ 2,737,200 Other asset-backed securities 429,983 6,307 (3,976) 432,314 State and municipal securities 748,224 18,294 (2,458) 764,060 U.S. government agency and government-sponsored enterprise securities 253,162 4,663 (1,333) 256,492 Total available for sale $ 4,103,196 $ 103,979 $ (17,109) $ 4,190,066 Held to maturity U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 2,024,715 $ 9,586 $ (1,321) $ 2,032,980 Total held to maturity $ 2,024,715 $ 9,586 $ (1,321) $ 2,032,980 December 31, 2020 Available for sale U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 3,640,351 $ 178,579 $ (4,543) $ 3,814,387 Other asset-backed securities 349,904 9,651 (2,076) 357,479 State and municipal securities 729,066 25,098 (592) 753,572 U.S. government agency and government-sponsored enterprise securities 278,208 6,545 (57) 284,696 Total available for sale $ 4,997,529 $ 219,873 $ (7,268) $ 5,210,134
Schedule of gross realized gains and losses on sales and calls of securities available for sale	The following table provides the proceeds and both gross realized gains and losses on sales and calls of debt securities available for sale as well as other securities gains and losses for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Proceeds from sales of debt securities available for sale $ 26,914 $ — $ 26,914 $ 194,105 Gross realized gains from sales of debt securities available for sale $ 751 $ — $ 751 $ 435 Gross realized losses from sales of debt securities available for sale (437) — (437) (186) Other securities gains (1) — 16,425 — 16,425 Investment securities gains, net $ 314 $ 16,425 $ 314 $ 16,674 __________ (1) Other securities gains includes gain from sale of Visa Class B restricted stock and subsequent write up to fair value of remaining Visa Class B shares. For additional information, please see Note 13 .
Unrealized gains and losses on equity securities	The following table provides the unrealized gains and losses on equity securities at the reporting date: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Gains recognized during the period on equity securities (1) $ — $ 16,425 $ — $ 16,425 Less: Gains recognized during the period on equity securities sold during the period (1) — (3,000) — (3,000) Unrealized gains recognized during the reporting period on equity securities still held at the reporting date (1) $ — $ 13,425 $ — $ 13,425 __________
Schedule Of Contractual Maturities	The scheduled contractual maturities of debt securities at the period presented below are as follows: June 30, 2021 Available for sale Held to maturity Amortized Cost Fair Value Amortized Cost Fair Value (in thousands) Due within one year $ 57,266 $ 57,900 $ — $ — Due after one year through five years 751,065 779,527 26,224 26,163 Due after five years through ten years 1,531,719 1,578,489 1,241,524 1,248,569 Due after ten years 1,763,146 1,774,150 756,967 758,248 Total debt securities $ 4,103,196 $ 4,190,066 $ 2,024,715 $ 2,032,980
Schedule of Securities pledged as collateral	The following table summarizes the carrying value of securities pledged as collateral to secure public funds, borrowings and other purposes as permitted or required by law: June 30, 2021 (in thousands) To secure public funds $ 492,636 To secure borrowings 100,289 Other securities pledged 187,276 Total securities pledged as collateral $ 780,201
Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses	The following table shows the gross unrealized losses and fair value of the Company’s debt securities available for sale for which an allowance for credit losses has not been recorded, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of the dates presented: Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized June 30, 2021 (in thousands) U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 807,523 $ (8,956) $ 23,308 $ (386) $ 830,831 $ (9,342) Other asset-backed securities 232,155 (3,976) 55 — 232,210 (3,976) State and municipal securities 223,105 (2,443) 1,647 (15) 224,752 (2,458) U.S. government agency and government-sponsored enterprise securities 150,218 (1,332) — (1) 150,218 (1,333) Total $ 1,413,001 $ (16,707) $ 25,010 $ (402) $ 1,438,011 $ (17,109) December 31, 2020 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 575,329 $ (3,728) $ 18,527 $ (815) $ 593,856 $ (4,543) Other asset-backed securities 143,764 (2,076) 70 — 143,834 (2,076) State and municipal securities 86,471 (592) — — 86,471 (592) U.S. government agency and government-sponsored enterprise securities 74,943 (57) — — 74,943 (57) Total $ 880,507 $ (6,453) $ 18,597 $ (815) $ 899,104 $ (7,268)

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2021
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Analysis of Loan Portfolio by Major Types of Loans	The Company’s loan portfolio includes originated and purchased loans. The following is an analysis of the loan portfolio by segment and class (net of unearned income): June 30, 2021 December 31, 2020 (dollars in thousands) Commercial loans: Commercial real estate $ 4,101,071 $ 4,062,313 Commercial business 3,738,288 3,597,968 Agriculture 797,580 779,627 Construction 300,303 268,663 Consumer loans: One-to-four family residential real estate 724,151 683,570 Other consumer 31,723 35,519 Total loans 9,693,116 9,427,660 Less: Allowance for credit losses (142,988) (149,140) Total loans, net $ 9,550,128 $ 9,278,520
Analysis of the Aged Loan Portfolio	The following is an aging of the recorded investment of the loan portfolio at the dates presented: Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans June 30, 2021 (in thousands) Commercial loans: Commercial real estate $ 4,089,659 $ 8,244 $ 149 $ — $ 8,393 $ 3,019 $ 4,101,071 Commercial business 3,724,202 2,351 990 — 3,341 10,745 3,738,288 Agriculture 785,071 2,537 938 — 3,475 9,034 797,580 Construction 300,303 — — — — — 300,303 Consumer loans: One-to-four family residential real estate 720,854 775 1,343 — 2,118 1,179 724,151 Other consumer 31,658 20 1 — 21 44 31,723 Total $ 9,651,747 $ 13,927 $ 3,421 $ — $ 17,348 $ 24,021 $ 9,693,116 Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans December 31, 2020 (in thousands) Commercial loans: Commercial real estate $ 4,037,309 $ 17,292 $ — — $ 17,292 $ 7,712 $ 4,062,313 Commercial business 3,578,905 1,282 4,559 — 5,841 13,222 3,597,968 Agriculture 767,102 911 — — 911 11,614 779,627 Construction 268,304 — 142 — 142 217 268,663 Consumer loans: One-to-four family residential real estate 677,627 2,283 1,659 — 3,942 2,001 683,570 Other consumer 35,450 24 5 — 29 40 35,519 Total $ 9,364,697 $ 21,792 $ 6,365 $ — $ 28,157 $ 34,806 $ 9,427,660
Interest written off on nonaccrual loans	The following table summarizes written-off interest on nonaccrual loans for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Commercial loans $ 212 $ 665 $ 424 $ 1,448 Consumer loans 2 8 9 13 Total $ 214 $ 673 $ 433 $ 1,461
Analysis of Nonaccrual Loans	The following summarizes the amortized cost of nonaccrual loans for which there was no related ACL for the periods indicated: June 30, 2021 December 31, 2020 (in thousands) Commercial loans: Commercial real estate $ 942 $ 6,393 Commercial business 6,125 6,382 Agriculture 6,744 8,136 Total $ 13,811 $ 20,911
Analysis of loans classified as Troubled Debt Restructurings (“TDR”)	The following is an analysis of loans classified as TDR for the periods indicated: Three Months Ended June 30, 2021 Three Months Ended June 30, 2020 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial loans: Commercial business 4 $ 1,757 $ 1,757 4 $ 1,690 $ 1,690 Consumer loans: One-to-four family residential real estate — — — 1 128 128 Total 4 $ 1,757 $ 1,757 5 $ 1,818 $ 1,818 Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial loans: Commercial real estate 1 $ 628 $ 628 — $ — $ — Commercial business 11 2,600 2,600 6 1,962 1,962 Agriculture — — — 1 895 895 Consumer loans: One-to-four family residential real estate 2 140 140 2 196 196 Total 14 $ 3,368 $ 3,368 9 $ 3,053 $ 3,053

Allowance for Credit Losses a_2

Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Tables)	6 Months Ended
	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses on Financing Receivables	The following tables show a detailed analysis of the ACL for the periods indicated: Beginning Balance Charge-offs Recoveries Provision Ending Balance Three Months Ended June 30, 2021 (in thousands) Commercial loans: Commercial real estate $ 57,050 $ (316) $ 16 $ (3,500) $ 53,250 Commercial business 58,405 (971) 874 (754) 57,554 Agriculture 9,487 (122) 5 (1,450) 7,920 Construction 6,551 — 521 (513) 6,559 Consumer loans: One-to-four family residential real estate 15,638 (146) 503 524 16,519 Other consumer 1,163 (385) 215 193 1,186 Total $ 148,294 $ (1,940) $ 2,134 $ (5,500) $ 142,988 Beginning Balance Charge-offs Recoveries Provision Ending Balance Six Months Ended June 30, 2021 (in thousands) Commercial loans: Commercial real estate $ 68,934 $ (316) $ 52 $ (15,420) $ 53,250 Commercial business 45,250 (4,310) 4,088 12,526 57,554 Agriculture 9,052 (122) 17 (1,027) 7,920 Construction 7,636 — 567 (1,644) 6,559 Consumer loans: One-to-four family residential real estate 16,875 (146) 554 (764) 16,519 Other consumer 1,393 (512) 276 29 1,186 Total $ 149,140 $ (5,406) $ 5,554 $ (6,300) $ 142,988 Beginning Balance Charge-offs Recoveries Provision Ending Balance Three Months Ended June 30, 2020 (in thousands) Commercial loans: Commercial real estate $ 37,122 $ — $ 13 $ 13,098 $ 50,233 Commercial business 45,570 (5,442) 811 12,247 53,186 Agriculture 11,085 — 1 3,782 14,868 Construction 8,845 — 235 (1,127) 7,953 Consumer loans: One-to-four family residential real estate 17,659 — 422 5,630 23,711 Other consumer 1,644 (198) 130 19 1,595 Unallocated 149 — — (149) — Total $ 122,074 $ (5,640) $ 1,612 $ 33,500 $ 151,546 Beginning Balance Impact of Adopting ASC 326 Charge-offs Recoveries Provision Ending Balance Six Months Ended June 30, 2020 (in thousands) Commercial loans: Commercial real estate $ 20,340 $ 7,533 $ (101) $ 27 $ 22,434 $ 50,233 Commercial business 30,292 762 (7,126) 1,671 27,587 53,186 Agriculture 15,835 (9,325) (4,726) 42 13,042 14,868 Construction 8,571 (1,750) — 677 455 7,953 Consumer loans: One-to-four family residential real estate 7,435 4,237 (10) 704 11,345 23,711 Other consumer 883 778 (466) 254 146 1,595 Unallocated 612 (603) — — (9) — Total 83,968 1,632 (12,429) 3,375 75,000 151,546
Changes in the Allowance for Unfunded Commitments and Letters of Credit	Changes in the allowance for unfunded commitments and letters of credit, a component of “Other liabilities” in the Consolidated Balance Sheets, are summarized as follows: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Beginning balance $ 9,800 $ 6,000 $ 8,300 $ 3,430 Impact of adopting ASC 326 — — — 1,570 Net changes in the allowance for unfunded commitments and letters of credit 200 2,800 1,700 3,800 Ending balance $ 10,000 $ 8,800 $ 10,000 $ 8,800
Financing Receivable Credit Quality Indicators	The following is an analysis of the credit quality of our loan portfolio as of the periods indicated: Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Term Loans Amortized Cost Basis by Origination Year 2021 2020 2019 2018 2017 Prior Total (1) June 30, 2021 (in thousands) Commercial loans: Commercial real estate Pass $ 389,826 $ 648,251 $ 584,280 $ 443,700 $ 452,989 $ 1,163,730 $ 57,550 $ 2,775 $ 3,743,101 Special mention 1,875 10,168 58,636 21,408 26,722 60,889 — 2,195 181,893 Substandard 507 3,917 43,600 10,882 28,362 87,655 1,154 — 176,077 Total commercial real estate $ 392,208 $ 662,336 $ 686,516 $ 475,990 $ 508,073 $ 1,312,274 $ 58,704 $ 4,970 $ 4,101,071 Commercial business Pass $ 881,501 $ 585,999 $ 325,418 $ 245,432 $ 163,134 $ 316,525 $ 980,429 $ 16,876 $ 3,515,314 Special mention — 1,243 8,311 6,293 4,955 990 43,386 251 65,429 Substandard 336 5,808 24,959 29,854 22,175 31,814 41,282 1,317 157,545 Total commercial business $ 881,837 $ 593,050 $ 358,688 $ 281,579 $ 190,264 $ 349,329 $ 1,065,097 $ 18,444 $ 3,738,288 Agriculture Pass $ 97,908 $ 95,853 $ 82,533 $ 37,066 $ 54,739 $ 102,476 $ 259,260 $ 1,744 $ 731,579 Special mention 109 4,593 738 325 64 — 4,526 — 10,355 Substandard — 6,343 10,045 1,643 3,862 2,529 30,317 907 55,646 Total agriculture $ 98,017 $ 106,789 $ 93,316 $ 39,034 $ 58,665 $ 105,005 $ 294,103 $ 2,651 $ 797,580 Construction Pass $ 115,216 $ 101,292 $ 19,352 $ 6,699 $ 3,448 $ 4,897 $ 30,302 $ 304 $ 281,510 Substandard — — 18,739 — — 54 — — 18,793 Total construction $ 115,216 $ 101,292 $ 38,091 $ 6,699 $ 3,448 $ 4,951 $ 30,302 $ 304 $ 300,303 Consumer loans: One-to-four family residential real estate Pass $ 130,355 $ 146,145 $ 58,921 $ 49,106 $ 23,838 $ 81,118 $ 227,230 $ 622 $ 717,335 Special mention — 2,350 — — 314 — — — 2,664 Substandard — 81 1,201 239 172 2,132 172 155 4,152 Total one-to-four family real estate $ 130,355 $ 148,576 $ 60,122 $ 49,345 $ 24,324 $ 83,250 $ 227,402 $ 777 $ 724,151 Other consumer Pass $ 4,289 $ 3,294 $ 2,270 $ 1,789 $ 671 $ 1,122 $ 18,006 $ 192 $ 31,633 Substandard — 25 38 — 2 2 23 — 90 Total consumer $ 4,289 $ 3,319 $ 2,308 $ 1,789 $ 673 $ 1,124 $ 18,029 $ 192 $ 31,723 Total $ 1,621,922 $ 1,615,362 $ 1,239,041 $ 854,436 $ 785,447 $ 1,855,933 $ 1,693,637 $ 27,338 $ 9,693,116 Less: Allowance for credit losses 142,988 Loans, net $ 9,550,128 __________ (1) Loans that are on short-term deferments are treated as Pass loans and will not be reported as past due provided that they are performing in accordance with the modified terms. Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Term Loans Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Total December 31, 2020 (in thousands) Commercial loans: Commercial real estate Pass $ 674,444 $ 645,328 $ 478,881 $ 502,112 $ 408,972 $ 946,980 $ 52,049 $ 11,332 $ 3,720,098 Special mention 3,348 39,374 21,285 30,232 46,197 50,115 5 2,139 192,695 Substandard 2,916 24,860 13,571 15,652 43,735 41,138 3,389 4,259 149,520 Total commercial real estate $ 680,708 $ 709,562 $ 513,737 $ 547,996 $ 498,904 $ 1,038,233 $ 55,443 $ 17,730 $ 4,062,313 Commercial business Pass $ 1,087,400 $ 366,435 $ 324,360 $ 199,010 $ 218,313 $ 214,677 $ 1,000,725 $ 11,540 $ 3,422,460 Special mention 3,002 26,361 8,471 24,582 7,004 10,650 22,426 — 102,496 Substandard 3,625 7,376 11,061 5,905 6,396 3,743 32,134 2,772 73,012 Total commercial business $ 1,094,027 $ 400,172 $ 343,892 $ 229,497 $ 231,713 $ 229,070 $ 1,055,285 $ 14,312 $ 3,597,968 Agriculture Pass $ 142,163 $ 90,612 $ 44,434 $ 58,366 $ 58,893 $ 59,396 $ 244,135 $ 9,299 $ 707,298 Special mention — 90 285 33 — — 85 13 506 Substandard 5,193 12,480 5,868 4,258 284 3,502 38,780 1,458 71,823 Total agriculture $ 147,356 $ 103,182 $ 50,587 $ 62,657 $ 59,177 $ 62,898 $ 283,000 $ 10,770 $ 779,627 Construction Pass $ 134,693 $ 66,974 $ 10,066 $ 3,498 $ 763 $ 1,805 $ 29,323 $ 3,753 $ 250,875 Substandard — 17,732 — — — 56 — — 17,788 Total construction $ 134,693 $ 84,706 $ 10,066 $ 3,498 $ 763 $ 1,861 $ 29,323 $ 3,753 $ 268,663 Consumer loans: One-to-four family real estate Pass $ 161,021 $ 77,756 $ 62,696 $ 29,737 $ 20,889 $ 78,098 $ 243,325 $ 3,655 $ 677,177 Special mention — — 332 — — 195 — — 527 Substandard — 849 227 1,166 344 1,968 1,005 307 5,866 Total one-to-four family real estate $ 161,021 $ 78,605 $ 63,255 $ 30,903 $ 21,233 $ 80,261 $ 244,330 $ 3,962 $ 683,570 Other consumer Pass $ 5,548 $ 3,109 $ 3,886 $ 989 $ 244 $ 1,060 $ 19,911 $ 474 $ 35,221 Substandard 30 — — 5 — 170 53 40 298 Total consumer $ 5,578 $ 3,109 $ 3,886 $ 994 $ 244 $ 1,230 $ 19,964 $ 514 $ 35,519 Total $ 2,223,383 $ 1,379,336 $ 985,423 $ 875,545 $ 812,034 $ 1,413,553 $ 1,687,345 $ 51,041 $ 9,427,660 Less: Allowance for credit losses 149,140 Loans, net $ 9,278,520

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	6 Months Ended
	Jun. 30, 2021
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Summary of Other Real Estate Owned	The following tables set forth activity in OREO for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Balance, beginning of period $ 521 $ 510 $ 553 $ 552 Transfers in — 558 — 558 Valuation adjustments (140) — (140) — Proceeds from sale of OREO property — (303) (132) (345) Gain (loss) on sale of OREO, net — (18) 100 (18) Balance, end of period $ 381 $ 747 $ 381 $ 747

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill and Intangible Assets	The following table sets forth activity for goodwill and other intangible assets for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Goodwill Total goodwill $ 765,842 $ 765,842 $ 765,842 $ 765,842 Other intangible assets, net CDI: Gross CDI balance at beginning of period 105,473 105,473 105,473 105,473 Accumulated amortization at beginning of period (81,582) (73,244) (79,658) (70,934) CDI, net at beginning of period 23,891 32,229 25,815 34,539 CDI current period amortization (1,852) (2,210) (3,776) (4,520) Total CDI, net at end of period 22,039 30,019 22,039 30,019 Intangible assets not subject to amortization 919 919 919 919 Other intangible assets, net at end of period 22,958 30,938 22,958 30,938 Total goodwill and other intangible assets at end of period $ 788,800 $ 796,780 $ 788,800 $ 796,780
Estimated Future Amortization Expense of Core Deposit Intangibles	The following table provides the estimated future amortization expense of our CDI for the remaining six months ending December 31, 2021 and the succeeding four years: Year ending December 31, (in thousands) 2021 $ 3,488 2022 5,880 2023 4,552 2024 3,432 2025 2,415

Derivatives and Balance Sheet_2

Derivatives and Balance Sheet Offsetting (Tables)	6 Months Ended
	Jun. 30, 2021
Derivative [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table presents the fair value of derivatives, as well as their classification on the Consolidated Balance Sheet as of the dates presented: Asset Derivatives Liability Derivatives June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value (in thousands) Derivatives not designated as hedging instruments: Interest rate lock commitments Other assets $ 585 Other assets $ 1,096 Other liabilities $ — Other liabilities $ — Interest rate forward loan sales contracts Other assets $ — Other assets $ — Other liabilities $ 23 Other liabilities $ 165 Interest rate swap contracts Other assets $ 32,546 Other assets $ 46,184 Other liabilities $ 32,853 Other liabilities $ 46,637
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The table below presents the effect of cash flow hedge accounting on accumulated other comprehensive income (loss) for the periods indicated: Amount of Gain or (Loss) Recognized in Accumulated Other Comprehensive Income on Derivative Location of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Three Months Ended June 30, Three Months Ended June 30, 2021 2020 2021 2020 (in thousands) Interest rate collar $ — $ 3,402 Interest income $ 2,602 $ 2,190 Six Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest rate collar $ — $ 26,825 Interest income $ 5,178 $ 3,130
Derivative Instruments, Gain (Loss)	The following table summarizes the types of derivatives not designated as hedging instruments and the gains (losses) recorded during the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Interest rate lock commitments $ (340) $ — $ (511) $ — Interest rate forward loan sales contracts (527) — 143 — Interest rate swap contracts (40) (473) 72 (473) Total derivative gains (losses) $ (907) $ (473) $ (296) $ (473)
Balance Sheet Offsetting [Table Text Block]	The following tables show the gross interest rate swap contracts, collar agreements and repurchase agreements in the Consolidated Balance Sheets and the respective collateral received or pledged in the form of cash or other financial instruments. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of over-collateralization are not shown. Gross Amounts of Recognized Assets/Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheets Collateral Pledged/Received Net Amount June 30, 2021 (in thousands) Assets Interest rate swap contracts $ 32,546 $ — $ 32,546 $ (430) $ 32,116 Liabilities Interest rate swap contracts $ 32,853 $ — $ 32,853 $ (30,167) $ 2,686 Repurchase agreements $ 70,994 $ — $ 70,994 $ (70,994) $ — December 31, 2020 Assets Interest rate swap contracts $ 46,184 $ — $ 46,184 $ — $ 46,184 Liabilities Interest rate swap contracts $ 46,637 $ — $ 46,637 $ (46,637) $ — Repurchase agreements $ 73,859 $ — $ 73,859 $ (73,859) $ —
Available-for-sale Securities [Member]
Derivative [Line Items]
Carrying Value of Securities Pledged As Collateral	The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements: Remaining contractual maturity of the agreements Overnight and continuous Up to 30 days 30 - 90 days Greater than 90 days Total June 30, 2021 (in thousands) Class of collateral pledged for repurchase agreements U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 70,994 $ — $ — $ — $ 70,994 Gross amount of recognized liabilities for repurchase agreements 70,994 Amounts related to agreements not included in offsetting disclosure $ —

Shareholders' Equity Dividends

Shareholders' Equity Dividends Declared (Tables)	6 Months Ended
	Jun. 30, 2021
Shareholders' Equity [Abstract]
Dividends Declared [Table Text Block]	The following table summarizes year-to-date dividend activity: Declared Regular Cash Dividends Per Common Share Record Date Paid Date January 28, 2021 $ 0.28 February 10, 2021 February 24, 2021 April 29, 2021 $ 0.28 May 12, 2021 May 26, 2021

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table shows changes in accumulated other comprehensive income (loss) by component for the periods indicated: Unrealized Gains and Losses on Available for Sale Securities (1) Unrealized Gains and Losses on Pension Plan Liability (1) Unrealized Gains and Losses on Hedging Instruments (1) Total (1) Three Months Ended June 30, 2021 (in thousands) Beginning balance $ 60,569 $ (5,718) $ 22,877 $ 77,728 Other comprehensive income (loss) before reclassifications 21,850 — — 21,850 Amounts reclassified from accumulated other comprehensive income (2) (586) 115 (1,998) (2,469) Net current-period other comprehensive income (loss) 21,264 115 (1,998) 19,381 Ending balance $ 81,833 $ (5,603) $ 20,879 $ 97,109 Three Months Ended June 30, 2020 Beginning balance $ 112,543 $ (3,894) $ 28,558 $ 137,207 Other comprehensive income before reclassifications 42,860 — 2,611 45,471 Amounts reclassified from accumulated other comprehensive income (2) — 79 (1,680) (1,601) Net current-period other comprehensive income 42,860 79 931 43,870 Ending balance $ 155,403 $ (3,815) $ 29,489 $ 181,077 Six Months Ended June 30, 2021 Beginning balance $ 163,174 $ (5,833) $ 24,854 $ 182,195 Other comprehensive income (loss) before reclassifications (80,755) — — (80,755) Amounts reclassified from accumulated other comprehensive income (2) (586) 230 (3,975) (4,331) Net current-period other comprehensive income (loss) (81,341) 230 (3,975) (85,086) Ending balance $ 81,833 $ (5,603) $ 20,879 $ 97,109 Six Months Ended June 30, 2020 Beginning balance $ 33,038 $ (3,974) $ 11,303 $ 40,367 Other comprehensive income before reclassifications 122,556 — 20,588 143,144 Amounts reclassified from accumulated other comprehensive income (2) (191) 159 (2,402) (2,434) Net current-period other comprehensive income 122,365 159 18,186 140,710 Ending balance $ 155,403 $ (3,815) $ 29,489 $ 181,077 __________ (1) All amounts are net of tax. Amounts in parentheses indicate debits. (2) See following table for details about these reclassifications.
Schedule of reclassifications from accumulated other comprehensive income [Table Text Block]	The following table shows details regarding the reclassifications from accumulated other comprehensive income (loss) for the periods indicated: Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Three Months Ended June 30, Six Months Ended June 30, Affected line Item in the Consolidated 2021 2020 2021 2020 Statement of Income (in thousands) Unrealized gains on available for sale debt securities $ 314 $ — $ 314 $ 249 Investment securities gains, net Amortization of unrealized gains related to securities transfer 450 — 450 — Loan interest income 764 — 764 249 Total before tax (178) — (178) (58) Income tax provision $ 586 $ — $ 586 $ 191 Net of tax Amortization of pension plan liability actuarial losses $ (149) $ (103) $ (299) $ (207) Compensation and employee benefits (149) (103) (299) (207) Total before tax 34 24 69 48 Income tax provision $ (115) $ (79) $ (230) $ (159) Net of tax Unrealized gains from hedging instruments $ 2,602 $ 2,190 $ 5,178 $ 3,130 Loans 2,602 2,190 5,178 3,130 Total before tax (604) (510) (1,203) (728) Income tax provision $ 1,998 $ 1,680 $ 3,975 $ 2,402 Net of tax

Fair Value Accounting and Mea_2

Fair Value Accounting and Measurement (Tables)	6 Months Ended
	Jun. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at the dates presented by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement: Fair Value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 June 30, 2021 (in thousands) Assets Debt securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 2,737,200 $ — $ 2,737,200 $ — Other asset-backed securities 432,314 — 432,314 — State and municipal securities 764,060 — 764,060 — U.S. government agency and government-sponsored enterprise securities 256,492 — 256,492 — Total debt securities available for sale $ 4,190,066 $ — $ 4,190,066 $ — Loans held for sale $ 14,413 $ — $ 14,413 $ — Other assets: Interest rate lock commitments $ 585 $ — $ — $ 585 Interest rate contracts $ 32,546 $ — $ 32,546 $ — Liabilities Other liabilities: Interest rate forward loan sales contracts $ 23 $ — $ 23 $ — Interest rate contracts $ 32,853 $ — $ 32,853 $ — Fair Value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 December 31, 2020 (in thousands) Assets Debt securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 3,814,387 $ — $ 3,814,387 $ — Other asset-backed securities 357,479 — 357,479 — State and municipal securities 753,572 — 753,572 — U.S. government agency and government-sponsored enterprise securities 284,696 — 284,696 — Total debt securities available for sale $ 5,210,134 $ — $ 5,210,134 $ — Loans held for sale $ 14,760 $ — $ 14,760 $ — Other assets: Interest rate lock commitments $ 1,096 $ — $ — $ 1,096 Interest rate contracts $ 46,184 $ — $ 46,184 $ — Liabilities Other liabilities: Interest rate forward loan sales contracts $ 165 $ — $ 165 $ — Interest rate contracts $ 46,637 $ — $ 46,637 $ —
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following table includes a rollforward of interest rate lock commitments which utilize Level 3 inputs to determine the fair value on a recurring basis. Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Balance at the beginning of the period $ 925 $ — $ 1,096 $ — Change included in earnings 2,134 — 3,844 — Settlements (2,474) — (4,355) — Balance at the end of the period $ 585 $ — $ 585 $ —
Equity Securities without Readily Determinable Fair Value	The following table presents the carrying value of equity securities, without readily determinable fair values, still held as of June 30, 2021, that are measured under the measurement alternative and related adjustments recorded during the periods presented for those securities with observable price changes. These securities are included in the nonrecurring fair value tables when applicable price changes are observable. Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 Equity securities without readily determinable fair values (in thousands) Carrying value, beginning of period $ 13,425 $ — $ 13,425 $ — Upward carrying value changes — 13,425 — 13,425 Carrying value, end of period $ 13,425 $ 13,425 $ 13,425 $ 13,425
Financial Assets Accounted For Fair Value On Nonrecurring Basis	The following tables set forth information related to the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the current and prior year quarterly periods: Fair Value at June 30, 2021 Fair Value Measurements Losses During the Three Months Ended June 30, 2021 Losses During the Six Months Ended June 30, 2021 Level 1 Level 2 Level 3 (in thousands) Collateral dependent loans $ 4,331 $ — $ — $ 4,331 $ 383 $ 383 OREO $ 375 $ — $ — $ 375 $ 140 $ 140 Fair Value at June 30, 2020 Fair Value Measurements Gains (Losses) During the Three Months Ended June 30, 2020 Gains (Losses) During the Six Months Ended June 30, 2020 Level 1 Level 2 Level 3 (in thousands) Collateral dependent loans $ 7,976 $ — $ — $ 7,976 $ (6,946) $ (7,745) Equity securities $ 13,425 $ — $ — $ 13,425 $ 13,425 $ 13,425
Fair Value, by Balance Sheet Grouping	The following tables summarize carrying amounts and estimated fair values of selected financial instruments by level within the fair value hierarchy at the dates presented: June 30, 2021 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 218,649 $ 218,649 $ 218,649 $ — $ — Interest-earning deposits with banks 612,883 612,883 612,883 — — Debt securities available for sale 4,190,066 4,190,066 — 4,190,066 — Debt securities held to maturity 2,024,715 2,032,980 — 2,032,980 — FHLB stock 10,280 10,280 — 10,280 — Loans held for sale 13,179 13,179 — 13,179 — Loans 9,550,128 9,955,668 — — 9,955,668 Interest rate contracts 32,546 32,546 — 32,546 — Interest rate lock commitments 585 585 — — 585 Liabilities Time deposits $ 327,882 $ 326,735 $ — $ 326,735 $ — FHLB advances 7,386 8,878 — 8,878 — Repurchase agreements 70,994 70,994 — 70,994 — Subordinated debentures 35,000 35,171 — 35,171 — Interest rate contracts 32,853 32,853 — 32,853 — Interest rate forward loan sales contracts 23 23 — 23 — December 31, 2020 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 218,899 $ 218,899 $ 218,899 $ — $ — Interest-earning deposits with banks 434,867 434,867 434,867 — — Debt securities available for sale 5,210,134 5,210,134 — 5,210,134 — FHLB stock 10,280 10,280 — 10,280 — Loans held for sale 26,481 26,481 — 26,481 — Loans 9,278,520 9,720,592 — — 9,720,592 Interest rate contracts 46,184 46,184 — 46,184 — Interest rate lock commitments 1,096 1,096 — — 1,096 Liabilities Time deposits $ 338,845 $ 338,815 $ — $ 338,815 $ — FHLB advances and FRB borrowings 7,414 9,295 — 9,295 — Repurchase agreements 73,859 73,859 — 73,859 — Subordinated debentures 35,092 35,414 — 35,414 — Interest rate contracts 46,637 46,637 — 46,637 — Interest rate forward loan sales contracts 165 165 — 165 —
Fair Value Option, Disclosures	The following table presents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans held for sale sold under the mandatory delivery method and accounted for under the fair value option as of the dates presented: June 30, 2021 December 31, 2020 Fair Value Aggregate Unpaid Principal Balance Fair Value Less Aggregate Unpaid Principal Balance Fair Value Aggregate Unpaid Principal Balance Fair Value Less Aggregate Unpaid Principal Balance (in thousands) $ 14,413 $ 14,050 $ 363 $ 14,760 $ 14,252 $ 508
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Assets, Quantitative Information	The range and weighted average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets, along with the valuation techniques used, are shown in the following table: Fair Value at June 30, 2021 Valuation Technique Unobservable Input Range (Weighted Average) (1) (dollars in thousands) Collateral dependent loans (2) $ 4,331 Fair Market Value of Collateral Adjustment to Stated Value 0.00% - 31.00% (3.67%) __________ (1) Discount applied to appraised value or stated value (in the case of fixed and intangible assets). (2) Collateral consists of intangible assets, fixed assets and real estate. Fair Value at June 30, 2020 Valuation Technique Unobservable Input Range (Weighted Average) (1) (dollars in thousands) Collateral dependent loans (2) $ 7,976 Fair Market Value of Collateral Adjustment to Stated Value 0.00% - 100.00% (56.22%) __________ (1) Discount applied to appraised value or stated value (in the case of accounts receivable, fixed assets and inventory). (2) Collateral consists of cash, accounts receivable, fixed assets, inventory and real estate.
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assets And Liabilities Measured On Recurring Basis ValuationTechniques	The following table provides a description of the valuation technique, significant unobservable inputs, and qualitative information about the unobservable inputs for the Company’s assets and liabilities classified as Level 3 and measured at fair value on a recurring basis at the dates presented: Fair Value at June 30, 2021 Valuation Technique Unobservable Input Range (Weighted Average) (dollars in thousands) Interest rate lock commitments $ 585 Internal pricing model Pull-through rate 78.50% - 98.53% (88.89%)

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted EPS for the periods presented: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands except per share amounts) Basic EPS: Net income $ 55,039 $ 36,582 $ 106,892 $ 51,210 Less: Earnings allocated to participating securities: Nonvested restricted shares 70 139 227 325 Earnings allocated to common shareholders $ 54,969 $ 36,443 $ 106,665 $ 50,885 Weighted average common shares outstanding 70,987 70,679 70,924 70,942 Basic earnings per common share $ 0.77 $ 0.52 $ 1.50 $ 0.72 Diluted EPS: Earnings allocated to common shareholders $ 54,969 $ 36,443 $ 106,665 $ 50,885 Weighted average common shares outstanding 70,987 70,679 70,924 70,942 Dilutive effect of equity awards 177 32 155 39 Weighted average diluted common shares outstanding 71,164 70,711 71,079 70,981 Diluted earnings per common share $ 0.77 $ 0.52 $ 1.50 $ 0.72 Potentially dilutive RSAs and RSUs that were not included in the computation of diluted EPS because to do so would be anti-dilutive 248 571 158 450

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	The following table shows the disaggregation of revenue from contracts with customers for the periods presented: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (in thousands) Noninterest income: Revenue from contracts with customers: Deposit account and treasury management fees $ 6,701 $ 6,092 $ 13,059 $ 13,880 Card revenue 4,773 3,079 8,506 6,597 Financial services and trust revenue 4,245 3,163 7,626 6,228 Total revenue from contracts with customers 15,719 12,334 29,191 26,705 Other sources of noninterest income 7,011 24,925 16,705 31,761 Total noninterest income $ 22,730 $ 37,259 $ 45,896 $ 58,466

Securities (Debt securities) (D

Securities (Debt securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, [Line Items]
Debt securities available-for-sale, amortized cost	$ 4,103,196	$ 4,997,529
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	103,979	219,873
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(17,109)	(7,268)
Debt securities available for sale at fair value	4,190,066	5,210,134
Debt Securities, Held-to-Maturity, Amortized Cost	2,024,715	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	9,586
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	1,321
Debt Securities, Held-to-maturity, Fair Value	2,032,980	0
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Debt Securities, [Line Items]
Debt securities available-for-sale, amortized cost	2,671,827	3,640,351
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	74,715	178,579
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(9,342)	(4,543)
Debt securities available for sale at fair value	2,737,200	3,814,387
Debt Securities, Held-to-Maturity, Amortized Cost	2,024,715
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	9,586
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	1,321
Debt Securities, Held-to-maturity, Fair Value	2,032,980
Asset-backed Securities [Member]
Debt Securities, [Line Items]
Debt securities available-for-sale, amortized cost	429,983	349,904
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	6,307	9,651
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3,976)	(2,076)
Debt securities available for sale at fair value	432,314	357,479
State and Municipal Securities [Member]
Debt Securities, [Line Items]
Debt securities available-for-sale, amortized cost	748,224	729,066
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	18,294	25,098
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,458)	(592)
Debt securities available for sale at fair value	764,060	753,572
U.S. Government and Government-Sponsored Enterprise Securities [Member]
Debt Securities, [Line Items]
Debt securities available-for-sale, amortized cost	253,162	278,208
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4,663	6,545
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1,333)	(57)
Debt securities available for sale at fair value	$ 256,492	$ 284,696

Securities (Summary of Gross Re

Securities (Summary of Gross Realized Gains and Gross Realized Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds from Sale of Debt Securities, Available-for-sale	$ 26,914	$ 0	$ 26,914	$ 194,105
Gross Realized Gains from sales of debt securities available for sale	751	0	751	435
Gross Realized Losses from sales of debt securities available for sale	(437)	0	(437)	(186)
Other securities gains	0	16,425	0	16,425
Investment securities gain (loss), net	$ 314	$ 16,425	$ 314	$ 16,674

Securities (Summary of Gross Un

Securities (Summary of Gross Unrealized Gains and Gross Unrealized Losses on Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Gains recognized during the period on equity securities	$ 0	$ 16,425	$ 0	$ 16,425
Less: Gains recognized during the period on equity securities sold during the period	0	3,000	0	3,000
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date	$ 0	$ 13,425	$ 0	$ 13,425

Securities (Schedule of Contrac

Securities (Schedule of Contractual Maturities of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	$ 57,266
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	751,065
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,531,719
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	1,763,146
Debt securities available-for-sale, amortized cost	4,103,196	$ 4,997,529
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	57,900
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	779,527
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,578,489
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,774,150
Debt securities available for sale at fair value	4,190,066	5,210,134
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	26,224
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year Five through Ten	1,241,524
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	756,967
Debt Securities, Held-to-Maturity, Amortized Cost	2,024,715	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value	0
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	26,163
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,248,569
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	758,248
Debt Securities, Held-to-maturity, Fair Value	$ 2,032,980	$ 0

Securities (Carrying Value of S

Securities (Carrying Value of Securities Pledged as Collateral) (Details) $ in Thousands	Jun. 30, 2021USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Restricted	$ 780,201
To secure public funds
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Restricted	492,636
To secure borrowings
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Restricted	100,289
Other securities pledged
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Restricted	$ 187,276

Securities (Summary of Gross _2

Securities (Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months Fair Value	$ 1,413,001	$ 880,507
Less than 12 Months Unrealized Losses	(16,707)	(6,453)
12 Months or More Fair Value	25,010	18,597
12 Months or More Unrealized Losses	(402)	(815)
Total Fair Value	1,438,011	899,104
Total Unrealized Losses	(17,109)	(7,268)
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months Fair Value	807,523	575,329
Less than 12 Months Unrealized Losses	(8,956)	(3,728)
12 Months or More Fair Value	23,308	18,527
12 Months or More Unrealized Losses	(386)	(815)
Total Fair Value	830,831	593,856
Total Unrealized Losses	(9,342)	(4,543)
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months Fair Value	232,155	143,764
Less than 12 Months Unrealized Losses	(3,976)	(2,076)
12 Months or More Fair Value	55	70
12 Months or More Unrealized Losses	0	0
Total Fair Value	232,210	143,834
Total Unrealized Losses	(3,976)	(2,076)
State and Municipal Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months Fair Value	223,105	86,471
Less than 12 Months Unrealized Losses	(2,443)	(592)
12 Months or More Fair Value	1,647	0
12 Months or More Unrealized Losses	(15)	0
Total Fair Value	224,752	86,471
Total Unrealized Losses	(2,458)	(592)
U.S. Government and Government-Sponsored Enterprise Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months Fair Value	150,218	74,943
Less than 12 Months Unrealized Losses	(1,332)	(57)
12 Months or More Fair Value	0	0
12 Months or More Unrealized Losses	(1)	0
Total Fair Value	150,218	74,943
Total Unrealized Losses	$ (1,333)	$ (57)

Securities (Narrative) (Details

Securities (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)securityshares	Jun. 30, 2020USD ($)shares	Jun. 30, 2021USD ($)securityshares	Jun. 30, 2020USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Debt Securities, Available-for-sale [Line Items]
Securities transfer from AFS to HTM, fair value			$ 2,012,123	$ 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 0		0			$ 0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Interest receivable	$ 52,347		$ 52,347			54,831
Visa Class B shares, shares sold | shares		17,360
Visa Class B shares, remaining shares | shares	77,683		77,683
Equity Securities	$ 13,425	$ 13,425	$ 13,425	$ 13,425	$ 13,425	13,425	$ 0	$ 0
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Interest receivable	15,100		15,100			17,100
Held-to-maturity Securities
Debt Securities, Available-for-sale [Line Items]
Interest receivable	4,200		$ 4,200			$ 0
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Securities transfer from AFS to HTM, fair value	2,010,000
Unrealized gain on AFS securities transferred to HTM, net of tax	$ 15,500
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	77		77
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	18		18
State and Municipal Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	66		66
U.S. Government and Government-Sponsored Enterprise Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	9		9

Loans (Analysis of Loan Portfol

Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 9,693,116		$ 9,427,660
Financing Receivable, Allowance for Credit Loss	(142,988)	$ (148,294)	(149,140)	$ (151,546)	$ (122,074)	$ (83,968)
Loans and Leases Receivable, Net Amount	9,550,128		9,278,520
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,101,071		4,062,313
Financing Receivable, Allowance for Credit Loss	(53,250)	(57,050)	(68,934)	(50,233)	(37,122)	(20,340)
Commercial Business [Member]
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,738,288		3,597,968
Financing Receivable, Allowance for Credit Loss	(57,554)	(58,405)	(45,250)	(53,186)	(45,570)	(30,292)
Agriculture [Member]
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income	797,580		779,627
Financing Receivable, Allowance for Credit Loss	(7,920)	(9,487)	(9,052)	(14,868)	(11,085)	(15,835)
Construction [Member]
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income	300,303		268,663
Financing Receivable, Allowance for Credit Loss	(6,559)	(6,551)	(7,636)	(7,953)	(8,845)	(8,571)
One-to-Four Family Residential [Member]
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income	724,151		683,570
Financing Receivable, Allowance for Credit Loss	(16,519)	(15,638)	(16,875)	(23,711)	(17,659)	(7,435)
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income	31,723		35,519
Financing Receivable, Allowance for Credit Loss	$ (1,186)	$ (1,163)	$ (1,393)	$ (1,595)	$ (1,644)	$ (883)

Loans (Analysis of the Aged Loa

Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 24,021	$ 34,806
Total Loans	9,693,116	9,427,660
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	3,019	7,712
Total Loans	4,101,071	4,062,313
Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	10,745	13,222
Total Loans	3,738,288	3,597,968
Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	9,034	11,614
Total Loans	797,580	779,627
Construction [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	0	217
Total Loans	300,303	268,663
One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	1,179	2,001
Total Loans	724,151	683,570
Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	44	40
Total Loans	31,723	35,519
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	9,651,747	9,364,697
Financial Asset, Not Past Due | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	4,089,659	4,037,309
Financial Asset, Not Past Due | Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	3,724,202	3,578,905
Financial Asset, Not Past Due | Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	785,071	767,102
Financial Asset, Not Past Due | Construction [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	300,303	268,304
Financial Asset, Not Past Due | One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	720,854	677,627
Financial Asset, Not Past Due | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	31,658	35,450
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	13,927	21,792
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	8,244	17,292
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	2,351	1,282
Financial Asset, 30 to 59 Days Past Due [Member] | Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	2,537	911
Financial Asset, 30 to 59 Days Past Due [Member] | Construction [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	775	2,283
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	20	24
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	3,421	6,365
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	149	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	990	4,559
Financial Asset, 60 to 89 Days Past Due [Member] | Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	938	0
Financial Asset, 60 to 89 Days Past Due [Member] | Construction [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	142
Financial Asset, 60 to 89 Days Past Due [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	1,343	1,659
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	1	5
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	17,348	28,157
Financial Asset, Past Due | Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	8,393	17,292
Financial Asset, Past Due | Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	3,341	5,841
Financial Asset, Past Due | Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	3,475	911
Financial Asset, Past Due | Construction [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	142
Financial Asset, Past Due | One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	2,118	3,942
Financial Asset, Past Due | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	$ 21	$ 29

Loans (Interest written off on

Loans (Interest written off on nonaccual loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Credit Quality Indicator - nonaccrual loans written off interest [Line Items]
Financing Receivable Accrued Interest Reversed Through Interest Income	$ 214	$ 673	$ 433	$ 1,461
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator - nonaccrual loans written off interest [Line Items]
Financing Receivable Accrued Interest Reversed Through Interest Income	212	665	424	1,448
Consumer Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator - nonaccrual loans written off interest [Line Items]
Financing Receivable Accrued Interest Reversed Through Interest Income	$ 2	$ 8	$ 9	$ 13

Loans (Analysis of Nonaccrual L

Loans (Analysis of Nonaccrual Loans with no ACL) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, No Allowance	$ 13,811	$ 20,911
Commercial Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, No Allowance	942	6,393
Commercial Business [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, No Allowance	6,125	6,382
Agriculture [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, No Allowance	$ 6,744	$ 8,136

Loans Loans (Analysis of Troubl

Loans Loans (Analysis of Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)Modifications	Jun. 30, 2020USD ($)Modifications	Jun. 30, 2021USD ($)Modifications	Jun. 30, 2020USD ($)Modifications
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	4	5	14	9
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 1,757	$ 1,818	$ 3,368	$ 3,053
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1,757	$ 1,818	$ 3,368	$ 3,053
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications			1	0
Financing Receivable, Troubled Debt Restructuring, Premodification			$ 628	$ 0
Financing Receivable, Troubled Debt Restructuring, Postmodification			$ 628	$ 0
Commercial Business [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	4	4	11	6
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 1,757	$ 1,690	$ 2,600	$ 1,962
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1,757	$ 1,690	$ 2,600	$ 1,962
Agriculture [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications			0	1
Financing Receivable, Troubled Debt Restructuring, Premodification			$ 0	$ 895
Financing Receivable, Troubled Debt Restructuring, Postmodification			$ 0	$ 895
One-to-Four Family Residential [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	0	1	2	2
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 0	$ 128	$ 140	$ 196
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 128	$ 140	$ 196

Loans (Narrative) (Details)

Loans (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)contract	Jun. 30, 2020contract	Jun. 30, 2021USD ($)contract	Jun. 30, 2020contract	Dec. 31, 2020USD ($)
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Interest Receivable, loans	$ 52,347		$ 52,347		$ 54,831
Financing Receivable Modifications Additional Commitment To Lend	$ 988		$ 988		651
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contract	0	0	0	0
Loan modifications, short-term deferments not classified as TDR, Number of contracts | contract			10
Loan modifications, short-term deferments not classified as TDR, net of unearned income			$ 40,700
Paycheck Protection Program (PPP) loans, net of unearned income	$ 691,900		691,900
Loans Receivable [Member]
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	3,560,000		3,560,000		3,460,000
Commercial Loan [Member]
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Loans pledged to collateralize Federal Reserve Bank Borrowings	200,300		200,300		200,400
Loans [Member]
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]
Interest Receivable, loans	$ 33,100		$ 33,100		$ 37,800

Allowance for Credit Losses a_3

Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	$ 142,988	$ 151,546	$ 142,988	$ 151,546	$ 148,294	$ 149,140	$ 122,074		$ 83,968
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,940)	(5,640)	(5,406)	(12,429)
Financing Receivable, Allowance for Credit Loss, Recovery	2,134	1,612	5,554	3,375
Provision (recapture) for credit losses	(5,500)	33,500	(6,300)	75,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	53,250	50,233	53,250	50,233	57,050	68,934	37,122		20,340
Financing Receivable, Allowance for Credit Loss, Writeoff	(316)	0	(316)	(101)
Financing Receivable, Allowance for Credit Loss, Recovery	16	13	52	27
Provision (recapture) for credit losses	(3,500)	13,098	(15,420)	22,434
Commercial Business [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	57,554	53,186	57,554	53,186	58,405	45,250	45,570		30,292
Financing Receivable, Allowance for Credit Loss, Writeoff	(971)	(5,442)	(4,310)	(7,126)
Financing Receivable, Allowance for Credit Loss, Recovery	874	811	4,088	1,671
Provision (recapture) for credit losses	(754)	12,247	12,526	27,587
Agriculture [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	7,920	14,868	7,920	14,868	9,487	9,052	11,085		15,835
Financing Receivable, Allowance for Credit Loss, Writeoff	(122)	0	(122)	(4,726)
Financing Receivable, Allowance for Credit Loss, Recovery	5	1	17	42
Provision (recapture) for credit losses	(1,450)	3,782	(1,027)	13,042
Construction [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	6,559	7,953	6,559	7,953	6,551	7,636	8,845		8,571
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	521	235	567	677
Provision (recapture) for credit losses	(513)	(1,127)	(1,644)	455
One-to-Four Family Residential [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	16,519	23,711	16,519	23,711	15,638	16,875	17,659		7,435
Financing Receivable, Allowance for Credit Loss, Writeoff	(146)	0	(146)	(10)
Financing Receivable, Allowance for Credit Loss, Recovery	503	422	554	704
Provision (recapture) for credit losses	524	5,630	(764)	11,345
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	1,186	1,595	1,186	1,595	$ 1,163	$ 1,393	1,644		883
Financing Receivable, Allowance for Credit Loss, Writeoff	(385)	(198)	(512)	(466)
Financing Receivable, Allowance for Credit Loss, Recovery	215	130	276	254
Provision (recapture) for credit losses	$ 193	19	$ 29	146
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss		0		0			$ 149		$ 612
Financing Receivable, Allowance for Credit Loss, Writeoff		0		0
Financing Receivable, Allowance for Credit Loss, Recovery		0		0
Provision (recapture) for credit losses		$ (149)		$ (9)
Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Change in allowance for credit losses due to adoption of new ASU								$ 1,632
Accounting Standards Update 2016-13 [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Change in allowance for credit losses due to adoption of new ASU								7,533
Accounting Standards Update 2016-13 [Member] | Commercial Business [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Change in allowance for credit losses due to adoption of new ASU								762
Accounting Standards Update 2016-13 [Member] | Agriculture [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Change in allowance for credit losses due to adoption of new ASU								(9,325)
Accounting Standards Update 2016-13 [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Change in allowance for credit losses due to adoption of new ASU								(1,750)
Accounting Standards Update 2016-13 [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Change in allowance for credit losses due to adoption of new ASU								4,237
Accounting Standards Update 2016-13 [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Change in allowance for credit losses due to adoption of new ASU								778
Accounting Standards Update 2016-13 [Member] | Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Change in allowance for credit losses due to adoption of new ASU								$ (603)

Allowance for Credit Losses a_4

Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Changes in the Allowance for Unfunded Commitments and Letters of Credit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Schedule of Allowance for Unfunded Commitments and Letters of Credit [Line Items]
Allowance For Unfunded Loan Commitments And Letters Of Credit	$ 10,000	$ 8,800	$ 10,000	$ 8,800	$ 9,800	$ 8,300	$ 6,000		$ 3,430
Allowance for Loan and Lease Losses, Net Changes In Unfunded Commitments and Letters Of Credit Allowance	$ 200	$ 2,800	$ 1,700	$ 3,800
Accounting Standards Update 2016-13 [Member]
Schedule of Allowance for Unfunded Commitments and Letters of Credit [Line Items]
Change in allowance for unfunded commitments and letters of credit due to adoption of new ASU					$ 0		$ 0	$ 0	$ 1,570

Allowance for Credit Losses a_5

Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Analysis of Credit Quality of the Loan Portfolio) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 1,621,922		$ 2,223,383
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,615,362		1,379,336
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,239,041		985,423
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	854,436		875,545
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	785,447		812,034
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,855,933		1,413,553
Financing Receivable, Revolving	1,693,637		1,687,345
Financing Receivable, Revolving Converted to Term Loans	27,338		51,041
Loans and Leases Receivable, Net of Deferred Income	9,693,116		9,427,660
Financing Receivable, Allowance for Credit Loss	142,988	$ 148,294	149,140	$ 151,546	$ 122,074	$ 83,968
Loans, net	9,550,128		9,278,520
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	392,208		680,708
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	662,336		709,562
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	686,516		513,737
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	475,990		547,996
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	508,073		498,904
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,312,274		1,038,233
Financing Receivable, Revolving	58,704		55,443
Financing Receivable, Revolving Converted to Term Loans	4,970		17,730
Loans and Leases Receivable, Net of Deferred Income	4,101,071		4,062,313
Financing Receivable, Allowance for Credit Loss	53,250	57,050	68,934	50,233	37,122	20,340
Commercial Real Estate [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	389,826		674,444
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	648,251		645,328
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	584,280		478,881
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	443,700		502,112
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	452,989		408,972
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,163,730		946,980
Financing Receivable, Revolving	57,550		52,049
Financing Receivable, Revolving Converted to Term Loans	2,775		11,332
Loans and Leases Receivable, Net of Deferred Income	3,743,101		3,720,098
Commercial Real Estate [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,875		3,348
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	10,168		39,374
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	58,636		21,285
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	21,408		30,232
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	26,722		46,197
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	60,889		50,115
Financing Receivable, Revolving	0		5
Financing Receivable, Revolving Converted to Term Loans	2,195		2,139
Loans and Leases Receivable, Net of Deferred Income	181,893		192,695
Commercial Real Estate [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	507		2,916
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,917		24,860
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	43,600		13,571
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	10,882		15,652
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	28,362		43,735
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	87,655		41,138
Financing Receivable, Revolving	1,154		3,389
Financing Receivable, Revolving Converted to Term Loans	0		4,259
Loans and Leases Receivable, Net of Deferred Income	176,077		149,520
Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	881,837		1,094,027
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	593,050		400,172
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	358,688		343,892
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	281,579		229,497
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	190,264		231,713
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	349,329		229,070
Financing Receivable, Revolving	1,065,097		1,055,285
Financing Receivable, Revolving Converted to Term Loans	18,444		14,312
Loans and Leases Receivable, Net of Deferred Income	3,738,288		3,597,968
Financing Receivable, Allowance for Credit Loss	57,554	58,405	45,250	53,186	45,570	30,292
Commercial Business [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	881,501		1,087,400
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	585,999		366,435
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	325,418		324,360
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	245,432		199,010
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	163,134		218,313
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	316,525		214,677
Financing Receivable, Revolving	980,429		1,000,725
Financing Receivable, Revolving Converted to Term Loans	16,876		11,540
Loans and Leases Receivable, Net of Deferred Income	3,515,314		3,422,460
Commercial Business [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0		3,002
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,243		26,361
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	8,311		8,471
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,293		24,582
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,955		7,004
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	990		10,650
Financing Receivable, Revolving	43,386		22,426
Financing Receivable, Revolving Converted to Term Loans	251		0
Loans and Leases Receivable, Net of Deferred Income	65,429		102,496
Commercial Business [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	336		3,625
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,808		7,376
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	24,959		11,061
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	29,854		5,905
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	22,175		6,396
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	31,814		3,743
Financing Receivable, Revolving	41,282		32,134
Financing Receivable, Revolving Converted to Term Loans	1,317		2,772
Loans and Leases Receivable, Net of Deferred Income	157,545		73,012
Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	98,017		147,356
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	106,789		103,182
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	93,316		50,587
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	39,034		62,657
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	58,665		59,177
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	105,005		62,898
Financing Receivable, Revolving	294,103		283,000
Financing Receivable, Revolving Converted to Term Loans	2,651		10,770
Loans and Leases Receivable, Net of Deferred Income	797,580		779,627
Financing Receivable, Allowance for Credit Loss	7,920	9,487	9,052	14,868	11,085	15,835
Agriculture [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	97,908		142,163
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	95,853		90,612
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	82,533		44,434
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	37,066		58,366
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	54,739		58,893
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	102,476		59,396
Financing Receivable, Revolving	259,260		244,135
Financing Receivable, Revolving Converted to Term Loans	1,744		9,299
Loans and Leases Receivable, Net of Deferred Income	731,579		707,298
Agriculture [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	109		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,593		90
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	738		285
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	325		33
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	64		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Revolving	4,526		85
Financing Receivable, Revolving Converted to Term Loans	0		13
Loans and Leases Receivable, Net of Deferred Income	10,355		506
Agriculture [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0		5,193
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,343		12,480
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	10,045		5,868
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,643		4,258
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,862		284
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,529		3,502
Financing Receivable, Revolving	30,317		38,780
Financing Receivable, Revolving Converted to Term Loans	907		1,458
Loans and Leases Receivable, Net of Deferred Income	55,646		71,823
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	115,216		134,693
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	101,292		84,706
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	38,091		10,066
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,699		3,498
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,448		763
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,951		1,861
Financing Receivable, Revolving	30,302		29,323
Financing Receivable, Revolving Converted to Term Loans	304		3,753
Loans and Leases Receivable, Net of Deferred Income	300,303		268,663
Financing Receivable, Allowance for Credit Loss	6,559	6,551	7,636	7,953	8,845	8,571
Construction [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	115,216		134,693
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	101,292		66,974
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	19,352		10,066
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,699		3,498
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,448		763
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,897		1,805
Financing Receivable, Revolving	30,302		29,323
Financing Receivable, Revolving Converted to Term Loans	304		3,753
Loans and Leases Receivable, Net of Deferred Income	281,510		250,875
Construction [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		17,732
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	18,739		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	54		56
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving Converted to Term Loans	0		0
Loans and Leases Receivable, Net of Deferred Income	18,793		17,788
One-to-Four Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	130,355		161,021
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	148,576		78,605
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	60,122		63,255
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	49,345		30,903
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	24,324		21,233
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	83,250		80,261
Financing Receivable, Revolving	227,402		244,330
Financing Receivable, Revolving Converted to Term Loans	777		3,962
Loans and Leases Receivable, Net of Deferred Income	724,151		683,570
Financing Receivable, Allowance for Credit Loss	16,519	15,638	16,875	23,711	17,659	7,435
One-to-Four Family Residential [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	130,355		161,021
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	146,145		77,756
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	58,921		62,696
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	49,106		29,737
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	23,838		20,889
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	81,118		78,098
Financing Receivable, Revolving	227,230		243,325
Financing Receivable, Revolving Converted to Term Loans	622		3,655
Loans and Leases Receivable, Net of Deferred Income	717,335		677,177
One-to-Four Family Residential [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,350		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0		332
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	314		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0		195
Financing Receivable, Revolving	0		0
Financing Receivable, Revolving Converted to Term Loans	0		0
Loans and Leases Receivable, Net of Deferred Income	2,664		527
One-to-Four Family Residential [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	81		849
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,201		227
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	239		1,166
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	172		344
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,132		1,968
Financing Receivable, Revolving	172		1,005
Financing Receivable, Revolving Converted to Term Loans	155		307
Loans and Leases Receivable, Net of Deferred Income	4,152		5,866
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	4,289		5,578
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,319		3,109
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,308		3,886
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,789		994
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	673		244
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,124		1,230
Financing Receivable, Revolving	18,029		19,964
Financing Receivable, Revolving Converted to Term Loans	192		514
Loans and Leases Receivable, Net of Deferred Income	31,723		35,519
Financing Receivable, Allowance for Credit Loss	1,186	$ 1,163	1,393	$ 1,595	$ 1,644	$ 883
Consumer Loan [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	4,289		5,548
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,294		3,109
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,270		3,886
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,789		989
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	671		244
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,122		1,060
Financing Receivable, Revolving	18,006		19,911
Financing Receivable, Revolving Converted to Term Loans	192		474
Loans and Leases Receivable, Net of Deferred Income	31,633		35,221
Consumer Loan [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0		30
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	25		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	38		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0		5
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2		170
Financing Receivable, Revolving	23		53
Financing Receivable, Revolving Converted to Term Loans	0		40
Loans and Leases Receivable, Net of Deferred Income	$ 90		$ 298

Allowance for Credit Losses a_6

Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Narrative) (Details)	3 Months Ended
	Jun. 30, 2021USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum loan balance of nonaccrual, collateral dependent loans considered for ACL	$ 500,000
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ (6,200,000)

Other Real Estate Owned (Summar

Other Real Estate Owned (Summary of Other Real Estate Owned) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Real Estate Owned [Line Items]
Balance, beginning of period	$ 521	$ 510	$ 553	$ 552
Real Estate Acquired Through Foreclosure Transfers In Net Of Write Downs	0	558	0	558
Transfer Other Real Estate Write Down	140	0	140	0
Proceeds from Sale of OREO Property	0	303	132	345
Gain on sale of OREO, net	0	(18)	100	(18)
Total OREO, end of period	$ 381	$ 747	$ 381	$ 747

Other Real Estate Owned (Narrat

Other Real Estate Owned (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Other Real Estate Owned [Line Items]
Foreclosed residential real estate properties	$ 381	$ 521	$ 553	$ 747	$ 510	$ 552
Mortgage Loans in Process of Foreclosure, Amount	166
One-to-Four Family Residential [Member]
Other Real Estate Owned [Line Items]
Foreclosed residential real estate properties	$ 0

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets [Roll Forward]
Total goodwill, beginning of period			$ 765,842
Total goodwill, end of period	$ 765,842	$ 765,842	765,842	$ 765,842
CDI current period amortization	(1,852)	(2,210)	(3,776)	(4,520)
Indefinite-lived Intangible Assets (Excluding Goodwill)	919	919	919	919
Other intangible assets, net	22,958	30,938	22,958	30,938		$ 26,734
Total goodwill and intangible assets, end of period	788,800	796,780	788,800	796,780
Core Deposits [Member]
Goodwill and Intangible Assets [Roll Forward]
Gross core deposit intangible balance, beginning of period					$ 105,473	105,473	$ 105,473	$ 105,473
Accumulated amortization at beginning of period					$ (81,582)	$ (79,658)	$ (73,244)	$ (70,934)
Core deposit intangible, net, beginning of period	23,891	32,229	25,815	34,539
CDI current period amortization	(1,852)	(2,210)	(3,776)	(4,520)
Total core deposit intangible, end of period	$ 22,039	$ 30,019	$ 22,039	$ 30,019

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets (Estimated Future Amortization Expense of Core Deposit Intangibles) (Details) $ in Thousands	Jun. 30, 2021USD ($)
Future Amortization Expense For Core Deposit Intangibles
2021	$ 3,488
2022	5,880
2023	4,552
2024	3,432
2025	$ 2,415

Intangible Assets, Goodwill and

Intangible Assets, Goodwill and Other (Details) - Narrative	6 Months Ended
	Jun. 30, 2021
Core Deposits [Member]
Goodwill and Intangible Assets [Line Items]
Estimated life of CDI, in years	10 years

Revolving Line of Credit (Detai

Revolving Line of Credit (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 15,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Short-term Debt	$ 0	$ 0

Derivatives and Balance Sheet_3

Derivatives and Balance Sheet Offsetting - Fair value of derivatives & classifications table (Details) - Not Designated as Hedging Instrument [Member] - Interest Rate Contracts [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Fair value of asset derivative instruments	$ 32,546	$ 46,184
Fair value of liability derivative instruments	32,853	46,637
Other Assets [Member] | Interest Rate Lock Commitments Contracts
Derivative [Line Items]
Fair value of asset derivative instruments	585	1,096
Other Assets [Member] | Interest rate Forward Sales Contracts
Derivative [Line Items]
Fair value of asset derivative instruments	0	0
Other Assets [Member] | Interest Rate Swap Contracts
Derivative [Line Items]
Fair value of asset derivative instruments	32,546	46,184
Other Liabilities [Member] | Interest Rate Lock Commitments Contracts
Derivative [Line Items]
Fair value of liability derivative instruments	0	0
Other Liabilities [Member] | Interest rate Forward Sales Contracts
Derivative [Line Items]
Fair value of liability derivative instruments	23	165
Other Liabilities [Member] | Interest Rate Swap Contracts
Derivative [Line Items]
Fair value of liability derivative instruments	$ 32,853	$ 46,637

Derivatives and Balance Sheet_4

Derivatives and Balance Sheet Offsetting - Cash flow hedge effect on AOCI table (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance Sheet Offsetting [Line Items]
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	$ 0	$ 3,402	$ 0	$ 26,825
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ 2,602	$ 2,190	$ 5,178	$ 3,130

Derivatives and Balance Sheet_5

Derivatives and Balance Sheet Offsetting - Not designated as hedging instruments gain/loss table (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance Sheet Offsetting [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (907)	$ (473)	$ (296)	$ (473)
Interest Rate Contracts [Member] | Interest Rate Lock Commitments Contracts
Balance Sheet Offsetting [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(340)	0	(511)	0
Interest Rate Contracts [Member] | Interest rate Forward Sales Contracts
Balance Sheet Offsetting [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(527)	0	143	0
Interest Rate Contracts [Member] | Interest Rate Swap Contracts
Balance Sheet Offsetting [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (40)	$ (473)	$ 72	$ (473)

Derivatives and Balance Sheet_6

Derivatives and Balance Sheet Offsetting - Collateral pledged table (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Balance Sheet Offsetting [Line Items]
Repurchase agreements, amounts offset in balance sheet	$ 0	$ 0
Repurchase agreements, net amount presented in statement of financial position	70,994	73,859
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(70,994)	(73,859)
Securities sold under agreements to repurchase, amount not offset	0	0
Interest Rate Contracts [Member]
Balance Sheet Offsetting [Line Items]
Derivative Assets, Gross Amounts Offset in the Balance Sheets	0	0
Derivative Asset	32,546	46,184
Derivative, Collateral, Obligation to Return Cash	(430)	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	32,116	46,184
Derivative Liability, Gross Amounts Offset in Balance Sheets	0	0
Derivative Liability	32,853	46,637
Derivative, Collateral, Right to Reclaim Cash	30,167	46,637
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	2,686	0
Available-for-sale Securities [Member]
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	70,994	73,859
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Balance Sheet Offsetting [Line Items]
Fair value of asset derivative instruments	32,546	46,184
Fair value of liability derivative instruments	$ 32,853	$ 46,637

Derivatives and Balance Sheet_7

Derivatives and Balance Sheet Offsetting - Collateral pledged for repurchase agreements table (Details) $ in Thousands	Jun. 30, 2021USD ($)
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	$ 70,994
Secured Borrowings, Gross, Difference, Amount	0
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	70,994
Maturity Overnight [Member] | U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	70,994
Maturity Less than 30 Days [Member] | U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	0
Maturity 30 to 90 Days [Member] | U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	0
Maturity Greater than 90 Days [Member] | U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	$ 0

Derivatives and Balance Sheet_8

Derivatives and Balance Sheet Offsetting (Narative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Balance Sheet Offsetting [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 10,400
Gain on termination of interest rate collar	34,400
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	70,994
Commitments To Originate Loans Held For Sale Member
Balance Sheet Offsetting [Line Items]
Commitments and contingent liabilities (Note 10)	26,900	$ 31,900
Interest rate Forward Sales Contracts
Balance Sheet Offsetting [Line Items]
Commitments and contingent liabilities (Note 10)	21,500	26,500
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Balance Sheet Offsetting [Line Items]
Derivative, Notional Amount	605,100	$ 597,900
Designated as Hedging Instrument [Member] | Interest rate collar [Domain]
Balance Sheet Offsetting [Line Items]
Derivative, Notional Amount	500,000
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	$ 70,994

Commitments and contingent li_2

Commitments and contingent liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Commitments to Extend Credit [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 3,040	$ 2,800
Standby Letters of Credit [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 24.7	$ 29.9

Shareholders' Equity (Details)

Shareholders' Equity (Details) - $ / shares	Jul. 29, 2021	Apr. 29, 2021	Jan. 28, 2021
Subsequent Event [Line Items]
Declared quarterly cash dividend		$ 0.28	$ 0.28
Subsequent Event [Member]
Subsequent Event [Line Items]
Declared quarterly cash dividend	$ 0.28

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 77,728	$ 137,207	$ 182,195	$ 40,367
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	21,850	45,471	(80,755)	143,144
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	(2,469)	(1,601)	(4,331)	(2,434)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	19,381	43,870	(85,086)	140,710
Ending balance	97,109	181,077	97,109	181,077
Unrealized Gains and Losses on Available-for-Sale Debt Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	60,569	112,543	163,174	33,038
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	21,850	42,860	(80,755)	122,556
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	(586)	0	(586)	(191)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	21,264	42,860	(81,341)	122,365
Ending balance	81,833	155,403	81,833	155,403
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(5,718)	(3,894)	(5,833)	(3,974)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0	0	0
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	115	79	230	159
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	115	79	230	159
Ending balance	(5,603)	(3,815)	(5,603)	(3,815)
Unrealized gains and losses on cash flow hedge
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	22,877	28,558	24,854	11,303
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	2,611	0	20,588
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	(1,998)	(1,680)	(3,975)	(2,402)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	(1,998)	931	(3,975)	18,186
Ending balance	$ 20,879	$ 29,489	$ 20,879	$ 29,489

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains, net			$ 314	$ 16,674
Loan interest income	$ 125,462	$ 121,851	249,456	244,273
Total before tax	69,576	44,777	133,977	62,635
Income tax provision	(14,537)	(8,195)	(27,085)	(11,425)
Net Income	55,039	36,582	106,892	51,210
Compensation and employee benefits	53,450	46,043	105,186	100,885
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Debt Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains, net	314	0	314	249
Total before tax	764	0	764	249
Income tax provision	(178)	0	(178)	(58)
Net Income	586	0	586	191
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of unrealized gains and losses related to available for sale securities transfer
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loan interest income	450	0	450	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Pension Plan Liability [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(149)	(103)	(299)	(207)
Income tax provision	34	24	69	48
Net Income	(115)	(79)	(230)	(159)
Compensation and employee benefits	(149)	(103)	(299)	(207)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gains and losses from hedging instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	2,602	2,190	5,178	3,130
Income tax provision	(604)	(510)	(1,203)	(728)
Net Income	1,998	1,680	3,975	2,402
Loans	$ 2,602	$ 2,190	$ 5,178	$ 3,130

Fair Value Accounting and Mea_3

Fair Value Accounting and Measurement (Financial Assets And Liabilities Accounted for Fair Value On Recurring Basis) (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 4,190,066	$ 5,210,134
Loans held for sale	14,413	14,760
Interest rate derivative asset	32,546	46,184
Interest rate derivative liability	32,853	46,637
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	0	0
Loans held for sale	0	0
Interest rate derivative asset	0	0
Interest rate derivative liability	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	4,190,066	5,210,134
Loans held for sale	14,413	14,760
Interest rate derivative asset	32,546	46,184
Interest rate derivative liability	32,853	46,637
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	0	0
Loans held for sale	0	0
Interest rate derivative asset	0	0
Interest rate derivative liability	0	0
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	2,737,200	3,814,387
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	0	0
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	2,737,200	3,814,387
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	0	0
Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	432,314	357,479
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	0	0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	432,314	357,479
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	0	0
State and Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	764,060	753,572
State and Municipal Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	0	0
State and Municipal Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	764,060	753,572
State and Municipal Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	0	0
U.S. Government Agency [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	256,492	284,696
U.S. Government Agency [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	0	0
U.S. Government Agency [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	256,492	284,696
U.S. Government Agency [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	0	0
Interest Rate Lock Commitments Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate derivative asset	585	1,096
Interest Rate Lock Commitments Contracts | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate derivative asset	0	0
Interest Rate Lock Commitments Contracts | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate derivative asset	0	0
Interest Rate Lock Commitments Contracts | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate derivative asset	585	1,096
Interest rate Forward Sales Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	23	165
Interest rate Forward Sales Contracts | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	0	0
Interest rate Forward Sales Contracts | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	23	165
Interest rate Forward Sales Contracts | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	$ 0	$ 0

Fair Value Accounting and Mea_4

Fair Value Accounting and Measurement (IRL Quantitative Information About Level 3 Fair Value Measurements) (Details) $ in Thousands	Jun. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Measurement input pull through rate member | Valuation technique internal pricing model member | Interest Rate Lock Commitments Contracts | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements Inputs and Valuation Techniques
Interest rate derivative asset, Measurement Input	0.7850
Measurement input pull through rate member | Valuation technique internal pricing model member | Interest Rate Lock Commitments Contracts | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements Inputs and Valuation Techniques
Interest rate derivative asset, Measurement Input	0.9853
Measurement input pull through rate member | Valuation technique internal pricing model member | Interest Rate Lock Commitments Contracts | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements Inputs and Valuation Techniques
Interest rate derivative asset, Measurement Input	0.8889
Fair Value, Recurring [Member]
Fair Value Measurements Inputs and Valuation Techniques
Interest rate derivative asset	$ 32,546	$ 46,184
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements Inputs and Valuation Techniques
Interest rate derivative asset	0	0
Fair Value, Recurring [Member] | Interest Rate Lock Commitments Contracts
Fair Value Measurements Inputs and Valuation Techniques
Interest rate derivative asset	585	1,096
Fair Value, Recurring [Member] | Interest Rate Lock Commitments Contracts | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements Inputs and Valuation Techniques
Interest rate derivative asset	$ 585	$ 1,096

Fair Value Accounting and Mea_5

Fair Value Accounting and Measurement (IRL rollforward) (Details) - Interest Rate Lock Commitments Contracts - Fair Value, Inputs, Level 3 [Member] - Fair Value, Recurring [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance - Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 585	$ 0	$ 585	$ 0	$ 925	$ 1,096	$ 0	$ 0
Change included in Earnings - Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings	2,134	0	3,844	0
Settlements - Fair Value Net Derivative Asset (Liability) Measured on Recurring Basis with Unobserved Inputs reconciliation, Sales and Settlements	$ (2,474)	$ 0	$ (4,355)	$ 0

Fair Value Accounting and Mea_6

Fair Value Accounting and Measurement Equity securities without readily determinable values (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Equity Securities	$ 13,425	$ 13,425	$ 13,425	$ 13,425	$ 13,425	$ 13,425	$ 0	$ 0
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	$ 0	$ 13,425	$ 0	$ 13,425

Fair Value Accounting and Mea_7

Fair Value Accounting and Measurement (Financial Assets Accounted For Fair Value On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities	$ 13,425	$ 13,425	$ 13,425	$ 13,425	$ 13,425	$ 13,425	$ 0	$ 0
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(57)	0	(145)
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans, Fair Value	4,331	7,976	4,331	7,976
Other real estate owned, fair value disclosure	375		375
Equity Securities		13,425		13,425
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans, Fair Value	0	0	0	0
Other real estate owned, fair value disclosure	0		0
Equity Securities		0		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans, Fair Value	0	0	0	0
Other real estate owned, fair value disclosure	0		0
Equity Securities		0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans, Fair Value	4,331	7,976	4,331	7,976
Other real estate owned, fair value disclosure	375		375
Equity Securities		13,425		13,425
Collateral dependent loans [Domain] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	383	(6,946)	383	(7,745)
Equity Securities [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		$ 13,425		$ 13,425
Other real estate owned | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 140		$ 140

Fair Value Accounting and Mea_8

Fair Value Accounting and Measurement (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Fair Value, Nonrecurring [Member] $ in Thousands	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)
Fair Value Measurements Inputs and Valuation Techniques
Collateral dependent loans, Fair Value	$ 4,331	$ 7,976
Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements Inputs and Valuation Techniques
Collateral dependent loans, Fair Value	$ 4,331	$ 7,976
Valuation, Market Approach [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements Inputs and Valuation Techniques
Collateral dependent loans, Measurement Input	0	0
Valuation, Market Approach [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements Inputs and Valuation Techniques
Collateral dependent loans, Measurement Input	0.3100	1
Valuation, Market Approach [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements Inputs and Valuation Techniques
Collateral dependent loans, Measurement Input	0.0367	0.5622

Fair Value Accounting and Mea_9

Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets
Interest-earning deposits with banks	$ 612,883	$ 434,867
Debt securities available for sale at fair value	4,190,066	5,210,134
Debt Securities, Held-to-Maturity, Amortized Cost	2,024,715	0
Debt Securities, Held-to-maturity, Fair Value	2,032,980	0
Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	218,649	218,899
Interest-earning deposits with banks	612,883	434,867
Debt securities available for sale at fair value	4,190,066	5,210,134
Debt Securities, Held-to-maturity, Fair Value	2,032,980
FHLB stock	10,280	10,280
Loans held for sale	13,179	26,481
Loans	9,955,668	9,720,592
Liabilities
Deposits	326,735	338,815
FHLB advances	8,878	9,295
Repurchase agreements	70,994	73,859
Subordinated Debentures	35,171	35,414
Carrying Amount
Assets
Cash and due from banks	218,649	218,899
Interest-earning deposits with banks	612,883	434,867
Debt securities available for sale at fair value	4,190,066	5,210,134
Debt Securities, Held-to-Maturity, Amortized Cost	2,024,715
FHLB stock	10,280	10,280
Loans held for sale	13,179	26,481
Loans	9,550,128	9,278,520
Liabilities
Deposits	327,882	338,845
FHLB advances	7,386	7,414
Repurchase agreements	70,994	73,859
Subordinated Debentures	35,000	35,092
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	218,649	218,899
Interest-earning deposits with banks	612,883	434,867
Debt securities available for sale at fair value	0	0
Debt Securities, Held-to-maturity, Fair Value	0
FHLB stock	0	0
Loans held for sale	0	0
Loans	0	0
Liabilities
Deposits	0	0
FHLB advances	0	0
Repurchase agreements	0	0
Subordinated Debentures	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Debt securities available for sale at fair value	4,190,066	5,210,134
Debt Securities, Held-to-maturity, Fair Value	2,032,980
FHLB stock	10,280	10,280
Loans held for sale	13,179	26,481
Loans	0	0
Liabilities
Deposits	326,735	338,815
FHLB advances	8,878	9,295
Repurchase agreements	70,994	73,859
Subordinated Debentures	35,171	35,414
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Debt securities available for sale at fair value	0	0
Debt Securities, Held-to-maturity, Fair Value	0
FHLB stock	0	0
Loans held for sale	0	0
Loans	9,955,668	9,720,592
Liabilities
Deposits	0	0
FHLB advances	0	0
Repurchase agreements	0	0
Subordinated Debentures	0	0
Interest Rate Swap Contracts | Estimate of Fair Value Measurement [Member]
Assets
Interest rate derivative asset	32,546	46,184
Liabilities
Interest rate derivative liability	32,853	46,637
Interest Rate Swap Contracts | Carrying Amount
Assets
Interest rate derivative asset	32,546	46,184
Liabilities
Interest rate derivative liability	32,853	46,637
Interest Rate Swap Contracts | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Interest rate derivative asset	0	0
Liabilities
Interest rate derivative liability	0	0
Interest Rate Swap Contracts | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Interest rate derivative asset	32,546	46,184
Liabilities
Interest rate derivative liability	32,853	46,637
Interest Rate Swap Contracts | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Interest rate derivative asset	0	0
Liabilities
Interest rate derivative liability	0	0
Interest Rate Lock Commitments Contracts | Estimate of Fair Value Measurement [Member]
Assets
Interest rate derivative asset	585	1,096
Interest Rate Lock Commitments Contracts | Carrying Amount
Assets
Interest rate derivative asset	585	1,096
Interest Rate Lock Commitments Contracts | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Interest rate derivative asset	0	0
Interest Rate Lock Commitments Contracts | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Interest rate derivative asset	0	0
Interest Rate Lock Commitments Contracts | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Interest rate derivative asset	585	1,096
Interest rate Forward Sales Contracts | Estimate of Fair Value Measurement [Member]
Liabilities
Interest rate derivative liability	23	165
Interest rate Forward Sales Contracts | Carrying Amount
Liabilities
Interest rate derivative liability	23	165
Interest rate Forward Sales Contracts | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Liabilities
Interest rate derivative liability	0	0
Interest rate Forward Sales Contracts | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Liabilities
Interest rate derivative liability	23	165
Interest rate Forward Sales Contracts | Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Liabilities
Interest rate derivative liability	$ 0	$ 0

Fair Value Accounting and Me_10

Fair Value Accounting and Measurement (Aggregate FV and aggregate unpaid principal balance of LHFS under FV option (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Fair Value Disclosures [Abstract]
FV, Loans held for sale, FV option, Mandatory Delivery method	$ 14,413	$ 14,760
Fair Value, Loans held for sale, FV option, Aggregate Unpaid Principal Balance	14,050	14,252
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables	$ 363	$ 508

Fair Value Accounting and Me_11

Fair Value Accounting and Measurement - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Visa Class B shares, remaining shares	77,683		77,683
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ (57)	$ 0	$ (145)

Earnings per Common Share (Deta

Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net Income	$ 55,039	$ 36,582	$ 106,892	$ 51,210
Earnings allocated to participating securities - nonvested restricted shares	70	139	227	325
Earnings allocated to common shareholders, Basic	$ 54,969	$ 36,443	$ 106,665	$ 50,885
Weighted average common shares outstanding	70,987	70,679	70,924	70,942
Basic earnings per common share	$ 0.77	$ 0.52	$ 1.50	$ 0.72
Earnings allocated to common shareholders, Diluted	$ 54,969	$ 36,443	$ 106,665	$ 50,885
Dilutive effect of equity awards	177	32	155	39
Weighted average diluted common shares outstanding	71,164	70,711	71,079	70,981
Diluted earnings per common share	$ 0.77	$ 0.52	$ 1.50	$ 0.72
Potentially dilutive stock awards and units that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	248	571	158	450

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Deposit account and treasury management fees	$ 6,701	$ 6,092	$ 13,059	$ 13,880
Card revenue	4,773	3,079	8,506	6,597
Financial services and trust revenue	4,245	3,163	7,626	6,228
Revenue from contracts with customers	15,719	12,334	29,191	26,705
Noninterest income, excluding revenue from contracts with customers	7,011	24,925	16,705	31,761
Noninterest Income	$ 22,730	$ 37,259	$ 45,896	$ 58,466