Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest income
Loans	$ 435,464	$ 466,432	$ 501,336
Securities
Taxable	24,732	24,224	29,875
Tax-exempt	6,800	6,287	5,477
Other	1,689	1,189	5,892
Total interest income	468,685	498,132	542,580
Interest expense
Deposits	28,976	54,016	81,995
Borrowings	15,708	17,319	16,928
Total interest expense	44,684	71,335	98,923
Net interest income	424,001	426,797	443,657
(Recovery of) provision for credit losses on loans	(1,700)	85,350	7,050
Provision for credit losses on HTM securities	32	0	0
Provision for other credit losses	0	1,500	0
(Recovery of) provision for credit losses	(1,668)	86,850	7,050
Net interest income after provision for credit losses	425,669	339,947	436,607
Noninterest income
Service charges on deposit accounts	36,569	31,326	35,972
Fees and commissions	15,732	13,043	19,430
Insurance commissions	9,841	8,990	8,919
Wealth management revenue	20,455	16,504	14,433
Mortgage banking income	109,604	150,499	57,896
Swap termination gains	4,676	0	0
Swap termination charges	0	2,040	0
Net gains on sales of securities	2,170	46	348
BOLI income	7,366	5,627	6,109
Other	20,571	9,497	10,147
Total noninterest income	226,984	235,532	153,254
Noninterest expense
Salaries and employee benefits	280,627	302,388	250,784
Data processing	21,726	20,685	19,679
Net occupancy and equipment	46,837	54,080	49,553
Other real estate owned	253	2,754	2,013
Professional fees	11,776	11,293	10,166
Advertising and public relations	12,203	10,322	11,607
Intangible amortization	6,042	7,121	8,105
Communications	8,869	8,866	8,858
Merger and conversion related expenses	0	0	279
Restructuring charges	368	7,365	0
Swap termination charges	0	2,040	0
Debt prepayment penalty	6,123	121	54
Other	35,002	44,953	13,076
Total noninterest expense	429,826	471,988	374,174
Income before income taxes	222,827	103,491	215,687
Income taxes	46,935	19,840	48,091
Net income	$ 175,892	$ 83,651	$ 167,596
Basic earnings per share (usd per share)	$ 3.13	$ 1.49	$ 2.89
Diluted earnings per share (usd per share)	3.12	1.48	2.88
Cash dividends per common share (usd per share)	$ 0.88	$ 0.88	$ 0.87