Parent Company Financial Statements, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities [Abstract]
Net income	$ 78,004	$ 81,814	$ 87,939
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Depreciation	5,351	5,219	5,033
Deferred taxes	709	3,250	2,330
Stock-based compensation	1,576	1,366	850
Gains on sale of assets, net	(408)	(354)	(165)
Changes in [Abstract]
Other assets	(2,630)	2,507	4,918
Other liabilities	(3,562)	608	(2,387)
Net cash provided by operating activities	85,732	99,684	115,695
Cash flows from investing activities [Abstract]
Net purchases of premises and equipment	(6,322)	(6,218)	(2,373)
Proceeds from sale and retirement of premises and equipment	375	620	830
Net cash used in investing activities	(226,599)	(280,007)	(358,620)
Cash flows from financing activities [Abstract]
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
Cash and cash equivalents at end of year	271,400	128,686
Parent Company [Member]
Cash flows from operating activities [Abstract]
Net income	78,004	81,814	87,939
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Depreciation	125	76	69
Equity in undistributed earnings of subsidiaries	(53,791)	(54,720)	(59,476)
Deferred taxes	(174)	630	3,759
Stock-based compensation	1,576	1,366	850
Gains on sale of assets, net	(48)	0	0
Changes in [Abstract]
Other assets	4,758	611	(5,403)
Other liabilities	1,039	(1,115)	1,037
Net cash provided by operating activities	31,489	28,662	28,775
Cash flows from investing activities [Abstract]
Net purchases of premises and equipment	(229)	(95)	(66)
Proceeds from sale and retirement of premises and equipment	48	0	0
Net cash used in investing activities	(181)	(95)	(66)
Cash flows from financing activities [Abstract]
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	(31,058)	(28,897)	(26,951)
Net increase (decrease) in cash and cash equivalents	250	(330)	1,758
Cash and cash equivalents at beginning of year	2,933	3,263	1,505
Cash and cash equivalents at end of year	$ 3,183	$ 2,933	$ 3,263