Condensed Financial Statements of Parent Company, 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	$ 75,090	$ 66,336	$ 58,734
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Equity in undistributed net income of the Bank	(42,565)	(58,016)	(40,597)
Net cash provided by operating activities	101,778	59,963	58,119
Cash flows from investing activities [Abstract]
Net cash used in investing activities	(315,299)	(296,150)	(736,754)
Cash flows from financing activities [Abstract]
Common stock repurchases	(20,310)	0	(2,834)
Cash dividends paid	(12,489)	(12,075)	(11,700)
Net provided by financing activities	86,318	567,810	767,714
Net change in cash and cash equivalents	(127,203)	331,623	89,079
Cash and cash equivalents, beginning of year	715,460	383,837	294,758
Cash and cash equivalents, end of year	588,257	715,460	383,837
Parent Company [Member]
Cash flows from operating activities [Abstract]
Net income	75,090	66,336	58,734
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Equity in undistributed net income of the Bank	(42,565)	(58,016)	(40,597)
Change in other assets and liabilities	197	739	(393)
Net cash provided by operating activities	32,722	9,059	17,744
Cash flows from investing activities [Abstract]
Payments for investments in non-qualified retirement plans	0	0	(403)
Securities sold or matured	124	0	0
Net cash used in investing activities	124	0	(403)
Cash flows from financing activities [Abstract]
Common stock repurchases	(20,310)	0	(2,834)
Issuance of common stock	0	0	403
Cash dividends paid	(12,489)	(12,075)	(11,700)
Net provided by financing activities	(32,799)	(12,075)	(14,131)
Net change in cash and cash equivalents	47	(3,016)	3,210
Cash and cash equivalents, beginning of year	1,535	4,551	1,341
Cash and cash equivalents, end of year	$ 1,582	$ 1,535	$ 4,551