Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 81,814	$ 87,939	$ 59,504
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,219	5,033	5,346
Deferred taxes	3,250	2,330	(2,909)
Stock-based compensation	1,366	850	944
Provision for credit losses (recovery)	4,905	(6,386)	16,047
Write-downs of other real estate owned and other repossessed assets	285	864	1,454
Gains on sale of loans held for sale	(1,525)	(6,820)	(7,226)
Securities gains (losses)	81	(60)	(1,251)
Fair value adjustment in equity securities	87	218	(518)
(Gains) losses on sale of assets, net	(354)	(165)	390
Proceeds from sale of mortgage loans held for sale	65,974	307,843	347,048
Funding of mortgage loans held for sale	(61,926)	(280,396)	(361,913)
Amortization of securities premiums and discounts, net	5,466	8,010	5,907
Change in cash surrender value of bank owned life insurance	(1,650)	(1,873)	(1,371)
Payment of operating lease liabilities	(1,773)	(1,693)	(1,682)
Mortgage servicing rights:
Fair value adjustments	(1,069)	(428)	1,064
New servicing assets created	(625)	(2,278)	(1,869)
Changes in:
Accrued interest receivable	(4,177)	403	(982)
Other assets	2,507	4,918	1,845
Accrued interest payable	1,221	(227)	(1,596)
Other liabilities	608	(2,387)	4,147
Net cash provided by operating activities	99,684	115,695	62,379
Certificates of deposit in other banks:
Purchase of certificates of deposit	0	0	(245)
Maturity of certificates of deposit	0	0	245
Securities available-for-sale (AFS):
Purchase of AFS securities	(179,627)	(797,445)	(857,167)
Proceeds from sales of AFS securities	11,462	1,080	186,194
Proceeds from prepayments, calls, and maturities of AFS securities	193,843	305,361	281,487
Securities held-to-maturity (HTM):
Proceeds from prepayments and maturities of HTM securities	0	0	517
Change in loans, net	(302,466)	146,050	(306,523)
Purchase of premises and equipment	(6,218)	(2,373)	(1,482)
Proceeds from sale and retirement of premises and equipment	620	830	1
Redemption of stock by Federal Home Loan Bank	1,463	1,909	426
Proceeds from sale of other real estate owned and repossessed assets	988	2,819	4,754
Additional investment in other real estate owned and repossessed assets	(73)	0	0
Additional investment in bank owned life insurance	0	(17,181)	(1,733)
Proceeds from settlement of bank owned life insurance	1	330	0
Net cash used in investing activities	(280,007)	(358,620)	(693,526)
Cash flows from financing activities:
Change in deposits, net	81,851	328,210	610,510
Change in repurchase agreements and federal funds purchased, net	(55,657)	(84,774)	121,539
Advances from Federal Home Loan Bank	45,000	0	25,000
Payments on advances from Federal Home Loan Bank	(45,020)	(20)	(25,020)
Payment of finance lease liabilities	(24)	(19)	(15)
Repurchase of long-term debt	0	0	0
Issuance of common stock	1,041	965	926
Repurchase of stock	0	0	(1,099)
Dividends paid	(29,938)	(27,916)	(27,142)
Net cash provided by (used in) financing activities	(2,747)	216,446	704,699
Net increase (decrease) in cash and cash equivalents	(183,070)	(26,479)	73,552
Cash and cash equivalents at beginning of year	311,756	338,235	264,683
Cash and cash equivalents at end of year	128,686	311,756	338,235
Supplemental disclosures:
Income taxes paid	16,293	19,485	13,275
Interest paid	27,419	15,316	27,047
Non-cash activities:
Loans to facilitate the sale of other real estate owned and repossessed assets	1,124	1,733	9,632
Common stock dividends accrued, paid in subsequent quarter	278	248	238
Real estate and assets acquired in settlement of loans	2,433	1,200	4,446
Right-of-use assets obtained in exchange for new operating/finance lease liabilities	$ 5,539	$ 0	$ 0