Loans and Allowance for Credit Losses - Activity in the Allowance for Loan Losses, by Portfolio Segment, for the Current Year (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			$ 225,231
Provision for credit loss expense	$ 12,148	$ 20,222	33,453	$ 36,199
Balance, end of period	233,223		233,223
Loans, Excluding Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	230,389	209,966	225,231	196,955
Provision for credit loss expense	12,148	20,222	33,453	36,199
Charge-offs	(10,662)	(12,893)	(29,824)	(19,777)
Recoveries	1,348	1,252	4,363	5,170
Net (charge-offs) recoveries	(9,314)	(11,641)	(25,461)	(14,607)
Balance, end of period	233,223	218,547	233,223	218,547
Loans, Excluding Acquired Loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	43,550	30,985	36,470	34,406
Provision for credit loss expense	8,088	4,095	26,107	774
Charge-offs	(8,235)	(1,219)	(20,071)	(2,857)
Recoveries	439	245	1,336	1,783
Net (charge-offs) recoveries	(7,796)	(974)	(18,735)	(1,074)
Balance, end of period	43,842	34,106	43,842	34,106
Loans, Excluding Acquired Loans | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	175,176	165,813	177,177	150,795
Provision for credit loss expense	1,598	16,528	1,770	32,013
Charge-offs	(159)	(9,723)	(3,139)	(11,362)
Recoveries	403	429	1,210	1,601
Net (charge-offs) recoveries	244	(9,294)	(1,929)	(9,761)
Balance, end of period	177,018	173,047	177,018	173,047
Loans, Excluding Acquired Loans | Consumer | Credit Card
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,765	6,330	5,868	5,140
Provision for credit loss expense	1,755	704	4,247	3,847
Charge-offs	(1,744)	(1,318)	(4,808)	(3,803)
Recoveries	231	234	700	766
Net (charge-offs) recoveries	(1,513)	(1,084)	(4,108)	(3,037)
Balance, end of period	6,007	5,950	6,007	5,950
Loans, Excluding Acquired Loans | Consumer | Other Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,898	6,838	5,716	6,614
Provision for credit loss expense	707	(1,105)	1,329	(435)
Charge-offs	(524)	(633)	(1,806)	(1,755)
Recoveries	275	344	1,117	1,020
Net (charge-offs) recoveries	(249)	(289)	(689)	(735)
Balance, end of period	$ 6,356	$ 5,444	$ 6,356	$ 5,444