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, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 205,332
Provision for credit loss expense	(5,379)	$ (31,209)	$ 82,488
Balance, end of period	196,955	205,332
Loans, Excluding Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	205,332	238,050	68,244
Acquisition adjustment for PCD loans	9,622	13,451
Provision for credit loss expense	(5,379)	(31,209)	82,488
Charge-offs	(24,130)	(26,982)	(70,659)
Recoveries	11,510	12,022	6,600
Net charge-offs	(12,620)	(14,960)	(64,059)
Balance, end of period	196,955	205,332	238,050
Loans, Excluding Acquired Loans | Other Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	4,617	5,617	2,169
Acquisition adjustment for PCD loans	2	1
Provision for credit loss expense	2,674	(352)	(6,093)
Charge-offs	(1,876)	(2,053)	(4,022)
Recoveries	1,197	1,404	1,465
Net charge-offs	(679)	(649)	(2,557)
Balance, end of period	6,614	4,617	5,617
Loans, Excluding Acquired Loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	17,458	42,093	22,863
Acquisition adjustment for PCD loans	6,433	3,349
Provision for credit loss expense	22,412	(22,031)	42,017
Charge-offs	(14,270)	(10,613)	(48,736)
Recoveries	2,373	4,660	3,216
Net charge-offs	(11,897)	(5,953)	(45,520)
Balance, end of period	34,406	17,458	42,093
Loans, Excluding Acquired Loans | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	179,270	182,868	39,161
Acquisition adjustment for PCD loans	3,187	10,101
Provision for credit loss expense	(34,456)	(7,918)	42,276
Charge-offs	(4,122)	(10,691)	(13,788)
Recoveries	6,916	4,910	905
Net charge-offs	2,794	(5,781)	(12,883)
Balance, end of period	150,795	179,270	182,868
Loans, Excluding Acquired Loans | Consumer | Credit Card
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	3,987	7,472	4,051
Acquisition adjustment for PCD loans	0	0
Provision for credit loss expense	3,991	(908)	4,288
Charge-offs	(3,862)	(3,625)	(4,113)
Recoveries	1,024	1,048	1,014
Net charge-offs	(2,838)	(2,577)	(3,099)
Balance, end of period	$ 5,140	$ 3,987	7,472
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			151,377
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans | Other Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			12,098
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			22,733
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			114,314
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans | Consumer | Credit Card
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			$ 2,232