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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			$ 225,231
Provision for credit loss expense	$ 11,099	$ 5,061	21,305	$ 15,977
Balance, end of period	230,389		230,389
Loans, Excluding Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	227,367	206,557	225,231	196,955
Provision for credit loss expense	11,099	5,061	21,305	15,977
Charge-offs	(9,334)	(3,735)	(19,162)	(6,884)
Recoveries	1,257	2,083	3,015	3,918
Net (charge-offs) recoveries	(8,077)	(1,652)	(16,147)	(2,966)
Balance, end of period	230,389	209,966	230,389	209,966
Loans, Excluding Acquired Loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	35,191	30,256	36,470	34,406
Provision for credit loss expense	15,147	1,483	18,019	(3,322)
Charge-offs	(7,243)	(1,225)	(11,836)	(1,637)
Recoveries	455	471	897	1,538
Net (charge-offs) recoveries	(6,788)	(754)	(10,939)	(99)
Balance, end of period	43,550	30,985	43,550	30,985
Loans, Excluding Acquired Loans | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	180,414	163,906	177,177	150,795
Provision for credit loss expense	(5,187)	1,464	172	15,485
Charge-offs	(123)	(435)	(2,980)	(1,639)
Recoveries	72	878	807	1,172
Net (charge-offs) recoveries	(51)	443	(2,173)	(467)
Balance, end of period	175,176	165,813	175,176	165,813
Loans, Excluding Acquired Loans | Consumer | Credit Card
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,768	6,446	5,868	5,140
Provision for credit loss expense	1,194	995	2,492	3,144
Charge-offs	(1,418)	(1,409)	(3,064)	(2,486)
Recoveries	221	298	469	532
Net (charge-offs) recoveries	(1,197)	(1,111)	(2,595)	(1,954)
Balance, end of period	5,765	6,330	5,765	6,330
Loans, Excluding Acquired Loans | Consumer | Other Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,994	5,949	5,716	6,614
Provision for credit loss expense	(55)	1,119	622	670
Charge-offs	(550)	(666)	(1,282)	(1,122)
Recoveries	509	436	842	676
Net (charge-offs) recoveries	(41)	(230)	(440)	(446)
Balance, end of period	$ 5,898	$ 6,838	$ 5,898	$ 6,838