Unaudited Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest and dividend income:
Interest and fees on loans	$ 90,936	$ 92,143	$ 179,575	$ 187,681
Taxable interest and dividends on available for sale securities	12,457	7,600	22,663	15,778
Non-taxable interest and dividends on available for sale securities	1,857	1,905	3,713	3,826
Interest on federal funds sold and other short-term investments	431	284	863	801
Interest and dividends on trading securities	0	1	0	6
Total interest and dividend income	105,681	101,933	206,814	208,092
Interest expense:
Interest on deposits	1,031	3,104	2,033	8,518
Interest on borrowings	42	74	82	673
Total interest expense	1,073	3,178	2,115	9,191
Net interest income	104,608	98,755	204,699	198,901
(Release of) provision for allowance for loan losses	(3,300)	8,600	(3,880)	37,200
Net interest income after provision for loan losses	107,908	90,155	208,579	161,701
Noninterest income:
Insurance commissions	23,664	22,697	51,811	50,174
Service charges on deposit accounts	5,708	4,364	11,075	10,462
Trust and investment advisory fees	6,074	5,194	11,737	10,289
Debit card processing fees	3,170	2,337	5,919	4,807
Interest rate swap (losses) income	(1,164)	771	4,241	(5,238)
Income from investments held in rabbi trusts	4,216	7,745	6,062	1,002
Losses on trading securities, net	0	(1)	0	(3)
Gains on sales of mortgage loans held for sale, net	848	1,420	2,327	1,513
Gains on sales of securities available for sale, net	1	163	1,165	285
Other	3,216	2,967	6,608	7,735
Total noninterest income	45,733	47,657	100,945	81,026
Noninterest expense:
Salaries and employee benefits	69,276	63,335	133,316	124,924
Office occupancy and equipment	8,094	8,615	16,311	17,304
Data processing	13,572	12,180	25,701	22,184
Professional services	6,439	4,396	10,587	8,085
Charitable contributions	0	2,797	0	3,984
Marketing	3,497	1,645	5,188	4,113
Loan expenses	1,854	2,036	3,701	3,148
FDIC insurance	985	944	1,933	1,850
Amortization of intangible assets	625	701	1,157	1,403
Other	2,993	4,116	3,490	8,942
Total noninterest expense	107,335	100,765	201,384	195,937
Income before income tax expense	46,306	37,047	108,140	46,790
Income tax expense	11,497	7,197	25,668	8,495
Net income	$ 34,809	$ 29,850	$ 82,472	$ 38,295
Basic earnings per share (in dollars per share)	$ 0.20	$ 0	$ 0.48	$ 0
Diluted earnings per share (in dollars per share)	$ 0.20	$ 0	$ 0.48	$ 0