Loans and Allowance for Credit Losses - Activity in the Allowance for Loan Losses, by Portfolio Segment, for the Current Year (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 196,955
Provision for credit loss expense	47,424	$ (5,379)	$ (31,209)
Balance, end of period	225,231	196,955
Loans, Excluding Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	196,955	205,332	238,050
Acquisition adjustment for PCD loans		9,622	13,451
Provision for credit loss expense	47,424	(5,379)	(31,209)
Charge-offs	(26,172)	(24,130)	(26,982)
Recoveries	7,024	11,510	12,022
Net charge-offs	(19,148)	(12,620)	(14,960)
Balance, end of period	225,231	196,955	205,332
Loans, Excluding Acquired Loans | Other Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	6,614	4,617	5,617
Acquisition adjustment for PCD loans		2	1
Provision for credit loss expense	86	2,674	(352)
Charge-offs	(2,522)	(1,876)	(2,053)
Recoveries	1,538	1,197	1,404
Net charge-offs	(984)	(679)	(649)
Balance, end of period	5,716	6,614	4,617
Loans, Excluding Acquired Loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	34,406	17,458	42,093
Acquisition adjustment for PCD loans		6,433	3,349
Provision for credit loss expense	5,934	22,412	(22,031)
Charge-offs	(5,962)	(14,270)	(10,613)
Recoveries	2,092	2,373	4,660
Net charge-offs	(3,870)	(11,897)	(5,953)
Balance, end of period	36,470	34,406	17,458
Loans, Excluding Acquired Loans | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	150,795	179,270	182,868
Acquisition adjustment for PCD loans		3,187	10,101
Provision for credit loss expense	36,381	(34,456)	(7,918)
Charge-offs	(12,385)	(4,122)	(10,691)
Recoveries	2,386	6,916	4,910
Net charge-offs	(9,999)	2,794	(5,781)
Balance, end of period	177,177	150,795	179,270
Loans, Excluding Acquired Loans | Consumer | Credit Card
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,140	3,987	7,472
Acquisition adjustment for PCD loans		0	0
Provision for credit loss expense	5,023	3,991	(908)
Charge-offs	(5,303)	(3,862)	(3,625)
Recoveries	1,008	1,024	1,048
Net charge-offs	(4,295)	(2,838)	(2,577)
Balance, end of period	$ 5,868	$ 5,140	$ 3,987