Discontinued Operations - Summary of the Operating Results of the Discontinued Insurance Agency Business (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Noninterest expense:
Net income from discontinued operations	$ 294,866	$ 13,248	$ 9,134
Discontinued Operations, Held-for-Sale | Insurance Agency Business
Noninterest income:
Insurance commissions	93,997	99,887	95,164
Other noninterest income	67	179	1,014
Total noninterest income (loss)	94,064	100,066	96,178
Noninterest expense:
Salaries and employee benefits	76,109	65,089	68,292
Office occupancy and equipment	4,420	3,319	3,204
Data processing	3,577	4,335	4,424
Professional services	1,176	1,009	596
Marketing expenses	179	246	241
Amortization of intangible assets	2,002	2,666	2,293
Other	5,304	4,944	4,411
Total noninterest expense	92,767	81,608	83,461
Income from discontinued operations before income tax expense	1,297	18,458	12,717
Gain on sale of discontinued operations before income tax expense	408,629	0	0
Total gain on discontinued operations before income tax expense	409,926	18,458	12,717
Income tax expense	115,060	5,210	3,583
Net income from discontinued operations	294,866	13,248	9,134
Disposal Group, Not Discontinued Operations, Transferrable Upon Sale to Entity | Insurance Agency Business
Noninterest income:
Income (losses) from investments held in rabbi trusts	697	(1,305)	937
Other noninterest income	60	54	52
Total noninterest income (loss)	757	(1,251)	989
Noninterest expense:
Salaries and employee benefits	721	(1,292)	967
Office occupancy and equipment	433	499	501
Other	1,608	2,396	(2,151)
Total noninterest expense	2,762	1,603	(683)
Total gain on discontinued operations before income tax expense	(2,005)	(2,854)	1,672
Income tax expense	(564)	(802)	470
Net income from discontinued operations	$ (1,441)	$ (2,052)	$ 1,202