Parent Company Only Financial Information - Statements of Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income	$ 113,363	$ 101,292	$ 47,555
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion, net	3,668	17,319	24,643
Gain on investment securities	3,700	61	862
Net cash provided by operating activities	143,643	119,839	156,420
Investing activities:
Business acquisitions, net of cash received	92,594	(85,791)	132,719
Net cash used in investing activities	(132,930)	(414,214)	(74,433)
Financing activities:
Purchase of treasury stock	(3,030)	(7,407)	0
Proceeds from issuance of common shares	1,264	1,226	906
Cash dividends paid	(51,845)	(42,372)	(31,002)
Net cash provided by financing activities	261,987	32,670	181,640
Net increase (decrease) in cash and cash equivalents	272,700	(261,705)	263,627
Cash and cash equivalents at beginning of period	154,022
Cash and cash equivalents at end of period	426,722	154,022
Holding Company
Operating activities:
Net income	113,363	101,292	47,555
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion, net	0	138	6,224
Equity in undistributed earnings of subsidiaries	(75,887)	(54,076)	(22,782)
Gain on investment securities	0	0	0
Other, net	(6,757)	5,008	3,930
Net cash provided by operating activities	30,719	52,362	34,927
Investing activities:
Net proceeds from sales and maturities of investment securities	0	0	10
Investment in subsidiaries	(39,414)	(13,084)	(16,282)
Decrease in receivable from subsidiary	40,086	12,279	16,344
Business acquisitions, net of cash received	27,763	(1,239)	(710)
Other, net	(1,636)	(262)	(1,998)
Net cash used in investing activities	26,799	(2,306)	(2,636)
Financing activities:
Purchase of treasury stock	(4,799)	(9,152)	(1,306)
Proceeds from issuance of common shares	1,264	1,226	906
Cash dividends paid	(51,845)	(42,371)	(31,002)
Net cash provided by financing activities	(55,380)	(50,297)	(31,402)
Net increase (decrease) in cash and cash equivalents	2,138	(241)	889
Cash and cash equivalents at beginning of period	15,011	15,252	14,363
Cash and cash equivalents at end of period	17,149	15,011	15,252
Supplemental cash flow information:
Interest paid	$ 676	$ 663	$ 331