Parent Company Financial Statements (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:
Net income	$ 71,681	$ 76,870	$ 69,829
Adjustments to reconcile net income to net cash provided by operating activities:
Tax (expense) benefit from stock option exercises and other equity awards	78	182	(103)
Deferred income tax expense (benefit)	1,160	2,155	(3,130)
(Increase) decrease in other assets	(30,804)	38,935	(57,730)
Net cash provided by (used in) operating activities	113,006	100,812	36,478
Cash flows from investing activities:
Repayment of equity investment in subsidiary	1,096	0	0
Purchases of other equity investments, net	(375)	(650)	0
Net cash provided by (used in) investing activities	(999,041)	(240,899)	(264,240)
Cash flows from financing activities:
Treasury stock purchased	(9,479)	0	(4,322)
Net proceeds from stock option exercises and issuance of other equity awards, net of awards surrendered	(821)	(177)	(470)
Cash dividends paid	(37,647)	(36,349)	(35,499)
Net cash provided by (used in) financing activities	825,964	116,312	291,575
Net increase (decrease) in cash and cash equivalents	(60,071)	(23,775)	63,813
Cash and cash equivalents at beginning of year	178,493	202,268	138,455
Cash and cash equivalents at end of year	118,422	178,493	202,268
Parent Company [Member]
Cash flows from operating activities:
Net income	71,681	76,870	69,829
Adjustments to reconcile net income to net cash provided by operating activities:
Tax (expense) benefit from stock option exercises and other equity awards	78	182	(103)
Deferred income tax expense (benefit)	5	(24)	0
(Increase) decrease in dividend receivable	2,386	(1,128)	(2,261)
(Increase) decrease in other assets	(175)	50	109
Increase (decrease) in accrued expenses and other liabilities	93	31	(31)
Other, net	(97)	(182)	193
Net cash provided by (used in) operating activities	54,493	43,808	40,111
Cash flows from investing activities:
Purchases of other equity investments, net	(375)	(650)	0
Net cash provided by (used in) investing activities	721	(650)	0
Cash flows from financing activities:
Treasury stock purchased	(9,479)	0	(4,322)
Net proceeds from stock option exercises and issuance of other equity awards, net of awards surrendered	(821)	(177)	(470)
Cash dividends paid	(37,647)	(36,349)	(35,499)
Net cash provided by (used in) financing activities	(47,947)	(36,526)	(40,291)
Net increase (decrease) in cash and cash equivalents	7,267	6,632	(180)
Cash and cash equivalents at beginning of year	8,290	1,658	1,838
Cash and cash equivalents at end of year	15,557	8,290	1,658
Bank [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings (losses) of subsidiaries	(19,565)	(32,045)	(27,603)
Non-bank [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings (losses) of subsidiaries	$ 87	$ 54	$ (22)