CONSOLIDATED STATEMENTS OF CASH FLOWS - 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
Provision for (recovery of) credit losses	15,174	(3,510)	731
Bank owned life insurance income	(4,151)	(2,624)	(1,767)
Net loss on investment securities	3,700	61	862
Fair value adjustment on equity investment securities	141	(2)	(111)
Loans originated for sale	(33,196)	(48,081)	(94,154)
Proceeds from sales of loans	34,041	50,442	157,349
Net gains on sales of loans	(659)	(994)	(2,994)
Deferred income tax (benefit) expense	(238)	18,566	2,874
Increase (decrease) in accrued expenses	13,194	(4,692)	2,433
(Increase) decrease in interest receivable	(6,443)	(5,836)	1,435
Increase in other assets	962	1,629	2,874
Increase (decrease) in interest payable	6,621	(420)	(282)
Increase in operating lease assets	(13,817)	0	0
Change in lease right-of-use assets and lease liabilities	(335)	(38)	509
Stock-based compensation	6,025	4,325	3,890
Other, net	5,593	(7,598)	10,573
Net cash provided by operating activities	143,643	119,839	156,420
Available-for-sale investment securities:
Purchases	(75,351)	(246,155)	(852,542)
Proceeds from sales	198,893	28,663	544,096
Proceeds from principal payments, calls and prepayments	151,047	190,143	297,693
Held-to-maturity investment securities:
Purchases	(207,428)	(206,768)	(316,346)
Proceeds from principal payments	84,116	19,033	7,333
Other investment securities:
Purchases	(27,206)	(23,632)	(1,415)
Proceeds from sales	21,281	5,784	9,299
Net (increase) decrease in loans held for investment	(356,075)	(58,142)	113,467
Net expenditures for premises and equipment	(13,458)	(6,753)	(6,685)
Proceeds from sales of other real estate owned	129	572	2,073
Investment in bank owned life insurance	0	(30,000)	0
Proceeds from bank owned life insurance	227	689	0
Business acquisitions, net of cash received	92,594	(85,791)	132,719
Investment in limited partnership and tax credit funds	(1,699)	(1,857)	(4,125)
Net cash used in investing activities	(132,930)	(414,214)	(74,433)
Financing activities:
Net (decrease) increase in non-interest-bearing deposits	(284,480)	(52,020)	150,986
Net increase (decrease) in interest-bearing deposits	485,921	(93,082)	49,774
Net increase in short-term borrowings	40,983	328,611	14,414
Proceeds from long-term borrowings	115,108	24,804	0
Payments on long-term borrowings	(40,165)	(125,345)	(2,132)
Cash dividends paid	(51,845)	(42,372)	(31,002)
Repurchase of treasury stock under share repurchase program	(3,030)	(7,407)	0
Purchase of treasury stock in connection with employee incentive program and compensation plan for Boards of Directors to be held as treasury stock	(1,769)	(1,745)	(1,306)
Proceeds from issuance of common shares	1,264	1,226	906
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	415,727	152,100
Cash and cash equivalents at end of period	426,722	154,022	415,727
Supplemental cash flow information:
Interest paid	90,367	16,270	13,391
Income taxes paid	29,866	4,131	6,693
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	31	110	298
Noncash recognition of new leases	$ 4,428	$ 880	$ 2,482