Parent Company Financial Statements, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities [Abstract]
Net income	$ 81,814	$ 87,939	$ 59,504
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Depreciation	5,219	5,033	5,346
Deferred taxes	3,250	2,330	(2,909)
Stock-based compensation	1,366	850	944
Changes in [Abstract]
Other assets	2,507	4,918	1,845
Other liabilities	608	(2,387)	4,147
Net cash provided by operating activities	99,684	115,695	62,379
Cash flows from investing activities [Abstract]
Net purchases of premises and equipment	(6,218)	(2,373)	(1,482)
Net cash used in investing activities	(280,007)	(358,620)	(693,526)
Cash flows from financing activities [Abstract]
Issuance of common stock	1,041	965	926
Repurchase of common 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
Cash and cash equivalents at end of year	128,686	311,756
Parent Company [Member]
Cash flows from operating activities [Abstract]
Net income	81,814	87,939	59,504
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Depreciation	76	69	112
Equity in undistributed earnings of subsidiaries	(54,720)	(59,476)	(33,792)
Deferred taxes	630	3,759	451
Stock-based compensation	1,366	850	944
Changes in [Abstract]
Other assets	611	(5,403)	(115)
Other liabilities	(1,115)	1,037	(318)
Net cash provided by operating activities	28,662	28,775	26,786
Cash flows from investing activities [Abstract]
Net purchases of premises and equipment	(95)	(66)	(55)
Net cash used in investing activities	(95)	(66)	(55)
Cash flows from financing activities [Abstract]
Issuance of common stock	1,041	965	926
Repurchase of common stock	0	0	(1,099)
Dividends paid	(29,938)	(27,916)	(27,142)
Net cash provided by (used in) financing activities	(28,897)	(26,951)	(27,315)
Net increase (decrease) in cash and cash equivalents	(330)	1,758	(584)
Cash and cash equivalents at beginning of year	3,263	1,505	2,089
Cash and cash equivalents at end of year	$ 2,933	$ 3,263	$ 1,505