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, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 238,050
Balance, end of period	205,332	$ 238,050
Loans, Excluding Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	238,050	68,244	$ 56,694
Provision for credit loss expense	(31,209)	82,488	43,240
Charge-offs	(26,982)	(70,659)	(36,836)
Recoveries	12,022	6,600	5,146
Net charge-offs	(14,960)	(64,059)	(31,690)
Balance, end of period	205,332	238,050	68,244
Loans, Excluding Acquired Loans | Other Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,617	2,169	2,419
Provision for credit loss expense	(352)	(6,093)	2,400
Charge-offs	(2,053)	(4,022)	(5,007)
Recoveries	1,404	1,465	2,357
Net charge-offs	(649)	(2,557)	(2,650)
Balance, end of period	4,617	5,617	2,169
Loans, Excluding Acquired Loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	42,093	22,863	20,514
Provision for credit loss expense	(22,031)	42,017	24,434
Charge-offs	(10,613)	(48,736)	(23,352)
Recoveries	4,660	3,216	1,267
Net charge-offs	(5,953)	(45,520)	(22,085)
Balance, end of period	17,458	42,093	22,863
Loans, Excluding Acquired Loans | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	182,868	39,161	29,838
Provision for credit loss expense	(7,918)	42,276	12,714
Charge-offs	(10,691)	(13,788)	(3,892)
Recoveries	4,910	905	501
Net charge-offs	(5,781)	(12,883)	(3,391)
Balance, end of period	179,270	182,868	39,161
Loans, Excluding Acquired Loans | Consumer | Credit Card
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	7,472	4,051	3,923
Provision for credit loss expense	(908)	4,288	3,692
Charge-offs	(3,625)	(4,113)	(4,585)
Recoveries	1,048	1,014	1,021
Net charge-offs	(2,577)	(3,099)	(3,564)
Balance, end of period	3,987	7,472	4,051
Cumulative Effect, Period of Adoption, Adjustment | Loans, Excluding Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	13,451	151,377
Balance, end of period		13,451	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	1	12,098
Balance, end of period		1	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	3,349	22,733
Balance, end of period		3,349	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	10,101	114,314
Balance, end of period		10,101	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	$ 0	2,232
Balance, end of period		$ 0	$ 2,232