Unaudited Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest and dividend income:
Interest and fees on loans	$ 160,862	$ 107,236	$ 314,402	$ 208,603
Taxable interest and dividends on securities	24,618	31,121	53,260	58,997
Non-taxable interest and dividends on securities	1,434	1,862	2,868	3,668
Interest on federal funds sold and other short-term investments	14,851	652	20,115	1,088
Total interest and dividend income	201,765	140,871	390,645	272,356
Interest expense:
Interest on deposits	56,146	3,061	99,079	6,383
Interest on borrowings	4,031	53	11,669	92
Total interest expense	60,177	3,114	110,748	6,475
Net interest income	141,588	137,757	279,897	265,881
Provision for allowance for loan losses	7,501	1,050	7,526	565
Net interest income after provision for allowance for loan losses	134,087	136,707	272,371	265,316
Noninterest income (loss):
Insurance commissions	27,609	24,682	59,112	53,395
Service charges on deposit accounts	7,242	8,313	13,714	16,850
Trust and investment advisory fees	6,131	5,994	11,901	12,135
Debit card processing fees	3,513	3,223	6,683	6,168
Interest rate swap income	825	1,593	417	4,525
Income (losses) from investments held in rabbi trusts	3,002	(7,316)	5,859	(11,749)
(Losses) gains on sales of mortgage loans held for sale, net	(50)	49	(124)	218
Losses on sales of securities available for sale, net	0	(104)	(333,170)	(2,276)
Other	5,559	5,443	11,109	9,026
Total noninterest income (loss)	53,831	41,877	(224,499)	88,292
Noninterest expense:
Salaries and employee benefits	79,224	72,996	157,702	142,522
Office occupancy and equipment	9,802	9,888	19,680	21,502
Data processing	13,874	14,345	27,315	29,665
Professional services	4,056	3,532	7,476	7,482
Marketing expenses	2,136	2,651	3,233	4,225
Loan expenses	1,115	1,626	2,210	3,545
FDIC insurance	3,034	1,720	5,580	3,132
Amortization of intangible assets	1,172	907	2,132	1,734
Other	7,235	3,474	12,614	6,198
Total noninterest expense	121,648	111,139	237,942	220,005
Income (loss) before income tax expense (benefit)	66,270	67,445	(190,070)	133,603
Income tax expense (benefit)	17,613	16,273	(44,631)	30,915
Net income (loss)	$ 48,657	$ 51,172	$ (145,439)	$ 102,688
Basic earnings per share (in dollars per share)	$ 0.30	$ 0.31	$ (0.90)	$ 0.61
Diluted earnings per share (in dollars per share)	$ 0.30	$ 0.31	$ (0.90)	$ 0.61