Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income
Loans	$ 716,456	$ 479,910	$ 435,464
Securities
Taxable	44,482	45,523	24,732
Tax-exempt	6,006	7,524	6,800
Other	30,375	8,853	1,689
Total interest income	797,319	541,810	468,685
Interest expense
Deposits	232,331	35,208	28,976
Borrowings	45,661	25,304	15,708
Total interest expense	277,992	60,512	44,684
Net interest income	519,327	481,298	424,001
Provision for (recovery of) credit losses on loans	18,793	23,788	(1,700)
(Recovery of) provision for credit losses on unfunded commitments	(3,200)	83	(500)
Provision for credit losses on held to maturity securities	0	0	32
Provision for (recovery of) credit losses	15,593	23,871	(2,168)
Net interest income after provision for (recovery of) credit losses	503,734	457,427	426,169
Noninterest income
Service charges on deposit accounts	39,199	39,957	36,569
Fees and commissions	17,901	17,268	15,732
Insurance commissions	11,102	10,754	9,841
Wealth management revenue	22,132	22,339	20,455
Mortgage banking income	32,413	35,794	109,604
Swap termination gains	0	0	4,676
Gain on debt extinguishment	620	0	0
Net (losses) gains on sales of securities	(22,438)	0	2,170
Impairment losses on securities	(19,352)	0	0
BOLI income	10,463	9,267	7,366
Other	21,035	13,874	20,571
Total noninterest income	113,075	149,253	226,984
Noninterest expense
Salaries and employee benefits	281,768	261,654	280,627
Data processing	15,195	14,900	21,726
Net occupancy and equipment	46,471	44,819	46,837
Other real estate owned	267	(453)	253
Professional fees	13,671	11,872	11,776
Advertising and public relations	14,726	14,325	12,203
Intangible amortization	5,380	5,122	6,042
Communications	8,238	7,958	8,869
Merger and conversion related expenses	0	1,787	0
Restructuring charges	0	732	368
Debt prepayment penalty	0	0	6,123
Other	53,906	32,656	35,502
Total noninterest expense	439,622	395,372	430,326
Income before income taxes	177,187	211,308	222,827
Income taxes	32,509	45,240	46,935
Net income (loss)	$ 144,678	$ 166,068	$ 175,892
Basic earnings per share (usd per share)	$ 2.58	$ 2.97	$ 3.13
Diluted earnings per share (usd per share)	2.56	2.95	3.12
Cash dividends per common share (usd per share)	$ 0.88	$ 0.88	$ 0.88