Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 78,004	$ 81,814	$ 87,939
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,351	5,219	5,033
Deferred taxes	709	3,250	2,330
Stock-based compensation	1,576	1,366	850
Provision for credit losses (recovery)	6,811	4,905	(6,386)
Write-downs of other real estate owned and other repossessed assets	211	285	864
Gains on sale of loans held for sale	(395)	(1,525)	(6,820)
Securities gains (losses)	(4)	81	(60)
Fair value adjustment in equity securities	(992)	87	218
Gains on sale of assets, net	(408)	(354)	(165)
Proceeds from sale of mortgage loans held for sale	15,203	65,974	307,843
Funding of mortgage loans held for sale	(14,851)	(61,926)	(280,396)
Amortization of securities premiums and discounts, net	2,658	5,466	8,010
Change in cash surrender value of bank owned life insurance	(2,361)	(1,650)	(1,873)
Payment of operating lease liabilities	(1,560)	(1,773)	(1,693)
Mortgage servicing rights:
Fair value adjustments	965	(1,069)	(428)
New servicing assets created	(162)	(625)	(2,278)
Changes in:
Accrued interest receivable	(3,983)	(4,177)	403
Other assets	(2,630)	2,507	4,918
Accrued interest payable	5,152	1,221	(227)
Other liabilities	(3,562)	608	(2,387)
Net cash provided by operating activities	85,732	99,684	115,695
Certificates of deposit in other banks:
Purchase of certificates of deposit	(245)	0	0
Maturity of certificates of deposit	245	0	0
Securities available-for-sale (AFS):
Purchase of AFS securities	(19,478)	(179,627)	(797,445)
Proceeds from sales of AFS securities	21,529	11,462	1,080
Proceeds from prepayments, calls, and maturities of AFS securities	124,656	193,843	305,361
Change in loans, net	(344,217)	(302,466)	146,050
Purchase of premises and equipment	(6,322)	(6,218)	(2,373)
Proceeds from sale and retirement of premises and equipment	375	620	830
Redemption of stock by Federal Home Loan Bank	1,964	1,463	1,909
Proceeds from sale of other real estate owned and repossessed assets	1,295	988	2,819
Additional investment in other real estate owned and repossessed assets	(47)	(73)	0
Additional investment in bank owned life insurance	(6,690)	0	(17,181)
Proceeds from settlement of bank owned life insurance	336	1	330
Net cash used in investing activities	(226,599)	(280,007)	(358,620)
Cash flows from financing activities:
Change in deposits, net	298,479	81,851	328,210
Change in repurchase agreements and federal funds purchased, net	9,814	(55,657)	(84,774)
Advances from Federal Home Loan Bank	225,000	45,000	0
Payments on advances from Federal Home Loan Bank	(225,021)	(45,020)	(20)
Payment of finance lease liabilities	(33)	(24)	(19)
Proceeds from long-term debt/other borrowings	6,563	0	0
Repayment of long-term debt/other borrowings	(163)	0	0
Issuance of common stock	1,129	1,041	965
Dividends paid	(32,187)	(29,938)	(27,916)
Net cash provided by (used in) financing activities	283,581	(2,747)	216,446
Net increase (decrease) in cash and cash equivalents	142,714	(183,070)	(26,479)
Cash and cash equivalents at beginning of year	128,686	311,756	338,235
Cash and cash equivalents at end of year	271,400	128,686	311,756
Supplemental disclosures:
Income taxes paid	20,728	16,293	19,485
Interest paid	90,388	27,419	15,316
Non-cash activities:
Loans to facilitate the sale of other real estate owned and repossessed assets	1,306	1,124	1,733
Common stock dividends accrued, paid in subsequent quarter	291	278	248
Real estate and assets acquired in settlement of loans	658	2,433	1,200
Right-of-use assets obtained in exchange for new operating/finance lease liabilities	$ 358	$ 5,539	$ 0