Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest and dividend income									$ 946,766	$ 796,459	$ 605,181
Interest expense									339,169	246,050	37,127
Net interest income									607,597	550,409	568,054
Provision for allowance for loan losses									67,380	20,052	17,925
Net interest income after provision for allowance for loan losses									540,217	530,357	550,129
Total noninterest income (loss)									123,917	(237,753)	76,750
Noninterest expense									508,368	418,602	388,649
Income (loss) from continuing operations before income tax expense									155,766	(125,998)	238,230
Income tax expense (benefit)									36,205	(63,309)	51,719
Net income (loss) from continuing operations									119,561	(62,689)	186,511
Net income (loss) from discontinued operations									0	294,866	13,248
Net income									$ 119,561	$ 232,177	$ 199,759
Basic earnings per share
Basic earnings (loss) per share from continuing operations (in dollars per share)									$ 0.66	$ (0.39)	$ 1.13
Basic earnings (loss) per share from discontinued operations (in dollars per share)									0	1.82	0.08
Basic earnings per share (in dollars per share)									0.66	1.43	1.21
Diluted earnings per share:
Diluted earnings (loss) per share from continuing operations (in dollars per share)									0.66	(0.39)	1.13
Diluted earnings per share from discontinued operations (in dollars per share)									0	1.82	0.08
Diluted earnings per share (in dollars per share)									$ 0.66	$ 1.43	$ 1.21
Average common shares outstanding:
Basic (in shares)									181,126,320	162,293,020	165,510,357
Diluted (in shares)									182,181,073	162,403,097	165,648,571
Revision of Prior Period, Reclassification, Adjustment | Insurance Agency Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest and dividend income	$ 270,761	$ 266,018	$ 207,376	$ 202,611	$ 203,646	$ 202,168	$ 201,765	$ 188,880
Interest expense	91,568	96,163	78,727	72,711	70,339	64,963	60,177	50,571
Net interest income	179,193	169,855	128,649	129,900	133,307	137,205	141,588	138,309
Provision for allowance for loan losses	6,820	46,983	6,126	7,451	5,198	7,328	7,501	25
Net interest income after provision for allowance for loan losses	172,373	122,872	122,523	122,449	128,109	129,877	134,087	138,284
Total noninterest income (loss)	37,349	33,528	25,348	27,692	26,739	19,157	26,204	(309,853)
Noninterest expense	137,544	159,753	109,869	101,202	121,029	101,748	99,934	95,891
Income (loss) from continuing operations before income tax expense	72,178	(3,353)	38,002	48,939	33,819	47,286	60,357	(267,460)
Income tax expense (benefit)	11,407	2,835	11,671	10,292	2,310	(16,178)	15,938	(65,379)
Net income (loss) from continuing operations	60,771	(6,188)	26,331	38,647	31,509	63,464	44,419	(202,081)
Net income (loss) from discontinued operations	0	0	0	0	286,994	(4,351)	4,238	7,985
Net income	$ 60,771	$ (6,188)	$ 26,331	$ 38,647	$ 318,503	$ 59,113	$ 48,657	$ (194,096)
Basic earnings per share
Basic earnings (loss) per share from continuing operations (in dollars per share)	$ 0.30	$ (0.03)	$ 0.16	$ 0.24	$ 0.19	$ 0.39	$ 0.27	$ (1.25)
Basic earnings (loss) per share from discontinued operations (in dollars per share)	0	0	0	0	1.77	(0.03)	0.03	0.05
Basic earnings per share (in dollars per share)	0.30	(0.03)	0.16	0.24	1.96	0.36	0.30	(1.20)
Diluted earnings per share:
Diluted earnings (loss) per share from continuing operations (in dollars per share)	0.30	(0.03)	0.16	0.24	0.19	0.39	0.27	(1.25)
Diluted earnings per share from discontinued operations (in dollars per share)	0	0	0	0	1.76	(0.03)	0.03	0.05
Diluted earnings per share (in dollars per share)	$ 0.30	$ (0.03)	$ 0.16	$ 0.24	$ 1.95	$ 0.36	$ 0.30	$ (1.20)
Average common shares outstanding:
Basic (in shares)	201,237,749	196,700,222	163,145,255	162,863,540	162,571,066	162,370,469	162,232,236	161,991,373
Diluted (in shares)	202,638,608	197,706,644	163,499,296	163,188,410	162,724,398	162,469,887	162,246,675	162,059,431