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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			$ 196,955
Provision for credit loss expense	$ 5,061	$ 30,406	15,977	$ 10,492
Balance, end of period	209,966		209,966
Loans, Excluding Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	206,557	178,924	196,955	205,332
Acquisition adjustment for PCD loans		4,043		4,043
Provision for credit loss expense	5,061	30,406	15,977	10,492
Charge-offs	(3,735)	(2,334)	(6,884)	(10,463)
Recoveries	2,083	1,572	3,918	3,207
Net (charge-offs) recoveries	(1,652)	(762)	(2,966)	(7,256)
Balance, end of period	209,966	212,611	209,966	212,611
Loans, Excluding Acquired Loans | Other Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,949	5,464	6,614	4,617
Acquisition adjustment for PCD loans		2		2
Provision for credit loss expense	1,119	1,454	670	2,328
Charge-offs	(666)	(518)	(1,122)	(932)
Recoveries	436	302	676	689
Net (charge-offs) recoveries	(230)	(216)	(446)	(243)
Balance, end of period	6,838	6,704	6,838	6,704
Loans, Excluding Acquired Loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	30,256	9,177	34,406	17,458
Acquisition adjustment for PCD loans		854		854
Provision for credit loss expense	1,483	22,853	(3,322)	20,334
Charge-offs	(1,225)	(688)	(1,637)	(7,007)
Recoveries	471	621	1,538	1,178
Net (charge-offs) recoveries	(754)	(67)	(99)	(5,829)
Balance, end of period	30,985	32,817	30,985	32,817
Loans, Excluding Acquired Loans | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	163,906	161,389	150,795	179,270
Acquisition adjustment for PCD loans		3,187		3,187
Provision for credit loss expense	1,464	1,629	15,485	(16,193)
Charge-offs	(435)	(124)	(1,639)	(600)
Recoveries	878	400	1,172	817
Net (charge-offs) recoveries	443	276	(467)	217
Balance, end of period	165,813	166,481	165,813	166,481
Loans, Excluding Acquired Loans | Consumer | Credit cards
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	6,446	2,894	5,140	3,987
Acquisition adjustment for PCD loans		0		0
Provision for credit loss expense	995	4,470	3,144	4,023
Charge-offs	(1,409)	(1,004)	(2,486)	(1,924)
Recoveries	298	249	532	523
Net (charge-offs) recoveries	(1,111)	(755)	(1,954)	(1,401)
Balance, end of period	$ 6,330	$ 6,609	$ 6,330	$ 6,609