Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest and dividend income:
Interest and fees on loans	$ 652,095	$ 476,041	$ 367,585
Taxable interest and dividends on available for sale securities	101,233	118,690	58,312
Non-taxable interest and dividends on available for sale securities	5,736	7,179	7,376
Interest on federal funds sold and other short-term investments	37,395	3,271	1,886
Total interest and dividend income	796,459	605,181	435,159
Interest expense:
Interest on deposits	226,075	28,621	5,167
Interest on borrowings	19,975	8,506	165
Total interest expense	246,050	37,127	5,332
Net interest income	550,409	568,054	429,827
Provision for (release of) allowance for loan losses	20,052	17,925	(9,686)
Net interest income after provision for (release of) allowance for loan losses	530,357	550,129	439,513
Noninterest (loss) income:
Service charges on deposit accounts	28,631	30,392	24,271
Trust and investment advisory fees	24,264	23,593	24,588
Debit card processing fees	13,469	12,644	12,118
Interest rate swap income	1,536	6,009	5,634
Income (losses) from investments held in rabbi trusts	9,305	(10,762)	10,217
Losses on sale of commercial and industrial loans	(2,738)	0	0
(Losses) gains on sales of mortgage loans held for sale, net	(507)	248	3,605
(Losses) gains on sales of securities available for sale, net	(333,170)	(3,157)	1,166
Other	21,457	17,783	15,838
Total noninterest (loss) income	(237,753)	76,750	97,437
Noninterest expense:
Salaries and employee benefits	253,037	233,097	227,624
Office occupancy and equipment	35,992	37,445	37,261
Data processing	55,308	52,938	46,415
Professional services	17,385	15,805	21,283
Marketing	7,592	9,294	8,500
Loan expenses	4,466	6,384	9,114
FDIC insurance	21,874	6,250	4,226
Amortization of core deposit intangible asset	1,804	1,198	219
Other	21,144	26,238	6,313
Total noninterest expense	418,602	388,649	360,955
(Loss) income from continuing operations before income tax expense	(125,998)	238,230	175,995
Income tax (benefit) expense	(63,309)	51,719	30,464
Net (loss) income from continuing operations	(62,689)	186,511	145,531
Net income from discontinued operations	294,866	13,248	9,134
Net income	$ 232,177	$ 199,759	$ 154,665
Basic earnings per share
Basic (loss) earnings per share from continuing operations (in dollars per share)	$ (0.39)	$ 1.13	$ 0.85
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	1.82	0.08	0.05
Basic earnings per share (in dollars per share)	1.43	1.21	0.90
Diluted earnings per share:
Diluted (loss) earnings per share from continuing operations (in dollars per share)	(0.39)	1.13	0.85
Diluted earnings per share from discontinued operations (in dollars per share)	1.82	0.08	0.05
Diluted earnings per share (in dollars per share)	$ 1.43	$ 1.21	$ 0.90