Summary of Significant Accounting Policies - Schedule of Company’s Reportable Operating Segment Results (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net interest income	$ 628,465	$ 650,126	$ 717,316
Noninterest income	147,171	155,566	170,066
TOTAL INTEREST INCOME	775,636	805,692	887,382
Salaries and employee benefits	284,124	286,117	286,982
Occupancy expense, net	48,214	46,741	44,321
Furniture and equipment expense	22,047	20,741	20,665
Deposit insurance	23,938	29,986	11,608
Other operating expenses	179,220	179,476	203,172
TOTAL NONINTEREST EXPENSE	557,543	563,061	566,748
Income before provision for credit losses and income taxes	218,093	242,631	320,634
Provision for credit losses	46,785	42,028	14,074
Provision for income taxes	18,615	25,546	50,148
NET INCOME	152,693	175,057	256,412
Assets	26,876,049	27,345,674	27,461,061
Community and Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	627,698	650,928	717,316
Noninterest income	109,701	120,567	136,820
TOTAL INTEREST INCOME	737,399	771,495	854,136
Salaries and employee benefits	265,610	268,300	268,817
Occupancy expense, net	46,373	46,712	44,296
Furniture and equipment expense	22,045	20,740	20,642
Deposit insurance	23,938	29,986	11,608
Other operating expenses	173,295	173,480	196,875
TOTAL NONINTEREST EXPENSE	531,261	539,218	542,238
Income before provision for credit losses and income taxes	206,138	232,277	311,898
Provision for credit losses	46,785	42,028	14,074
Provision for income taxes	18,530	25,451	50,065
NET INCOME	140,823	164,798	247,759
Assets	26,870,061	27,338,690	27,453,130
Other
Segment Reporting Information [Line Items]
Net interest income	767	(802)	0
Noninterest income	37,470	34,999	33,246
TOTAL INTEREST INCOME	38,237	34,197	33,246
Salaries and employee benefits	18,514	17,817	18,165
Occupancy expense, net	1,841	29	25
Furniture and equipment expense	2	1	23
Deposit insurance	0	0	0
Other operating expenses	5,925	5,996	6,297
TOTAL NONINTEREST EXPENSE	26,282	23,843	24,510
Income before provision for credit losses and income taxes	11,955	10,354	8,736
Provision for credit losses	0	0	0
Provision for income taxes	85	95	83
NET INCOME	11,870	10,259	8,653
Assets	$ 5,988	$ 6,984	$ 7,931