Parent Company Only Financial Information - Statements of Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net income	$ 101,292	$ 47,555	$ 34,767
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion, net	17,319	24,643	25,639
Gain on investment securities	61	862	368
Net cash provided by operating activities	119,839	156,420	85,483
Investing activities:
Business acquisitions, net of cash received	(85,791)	132,719	(94,856)
Net cash used in investing activities	(414,214)	(74,433)	(393,919)
Financing activities:
Purchase of treasury stock	(7,407)	0	(29,281)
Proceeds from issuance of common shares	1,226	906	594
Cash dividends paid	(42,372)	(31,002)	(27,052)
Net cash provided by financing activities	32,670	181,640	345,343
Net (decrease) increase in cash and cash equivalents	(261,705)	263,627	36,907
Cash and cash equivalents at beginning of period	415,727
Cash and cash equivalents at end of period	154,022	415,727
Holding Company
Operating activities:
Net income	101,292	47,555	34,767
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion, net	138	6,224	161
(Equity in) excess dividends from undistributed earnings of subsidiaries	(54,076)	(22,782)	8,259
Gain on investment securities	0	0	(8)
Other, net	5,008	3,930	8,492
Net cash provided by operating activities	52,362	34,927	51,671
Investing activities:
Net proceeds from sales and maturities of investment securities	0	10	10
Investment in subsidiaries	(13,084)	(16,282)	(35,238)
Decrease in receivable from subsidiary	12,279	16,344	34,719
Business acquisitions, net of cash received	(1,239)	(710)	0
Other, net	(262)	(1,998)	(76)
Net cash used in investing activities	(2,306)	(2,636)	(585)
Financing activities:
Purchase of treasury stock	(9,152)	(1,306)	(30,409)
Proceeds from issuance of common shares	1,226	906	594
Cash dividends paid	(42,371)	(31,002)	(27,052)
Net cash provided by financing activities	(50,297)	(31,402)	(56,867)
Net (decrease) increase in cash and cash equivalents	(241)	889	(5,781)
Cash and cash equivalents at beginning of period	15,252	14,363	20,144
Cash and cash equivalents at end of period	15,011	15,252	14,363
Supplemental cash flow information:
Interest paid	$ 663	$ 331	$ 385