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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | $ 238,050 |
Provision for credit loss expense | $ (19,890) | $ 22,981 | (31,396) | $ 68,030
Balance, end of period | 202,508 |  | 202,508 |
Loans, Excluding Acquired Loans |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 227,239 | 231,643 | 238,050 | 68,244
Provision for credit loss expense | (19,890) | 22,313 | (29,901) | 75,190
Charge-offs | (8,047) | (7,403) | (14,503) | (50,298)
Recoveries | 3,206 | 1,698 | 8,862 | 3,738
Net charge-offs | (4,841) | (5,705) | (5,641) | (46,560)
Balance, end of period | 202,508 | 248,251 | 202,508 | 248,251
Loans, Excluding Acquired Loans | Other Consumer and Other |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 3,616 | 12,055 | 5,617 | 2,169
Provision for credit loss expense | (122) | (2,844) | (1,737) | (3,829)
Charge-offs | (463) | (1,091) | (1,577) | (3,062)
Recoveries | 408 | 366 | 1,136 | 1,110
Net charge-offs | (55) | (725) | (441) | (1,952)
Balance, end of period | 3,439 | 8,486 | 3,439 | 8,486
Loans, Excluding Acquired Loans | Commercial |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 29,793 | 59,138 | 42,093 | 22,863
Provision for credit loss expense | (11,853) | (6,499) | (25,453) | 42,808
Charge-offs | (932) | (4,327) | (2,099) | (40,537)
Recoveries | 463 | 936 | 2,930 | 1,381
Net charge-offs | (469) | (3,391) | 831 | (39,156)
Balance, end of period | 17,471 | 49,248 | 17,471 | 49,248
Loans, Excluding Acquired Loans | Real Estate |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 188,388 | 149,471 | 182,868 | 39,161
Provision for credit loss expense | (7,668) | 33,479 | (1,948) | 31,341
Charge-offs | (5,941) | (1,153) | (8,068) | (3,373)
Recoveries | 2,068 | 120 | 3,995 | 474
Net charge-offs | (3,873) | (1,033) | (4,073) | (2,899)
Balance, end of period | 176,847 | 181,917 | 176,847 | 181,917
Loans, Excluding Acquired Loans | Consumer | Credit cards |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 5,442 | 10,979 | 7,472 | 4,051
Provision for credit loss expense | (247) | (1,823) | (763) | 4,870
Charge-offs | (711) | (832) | (2,759) | (3,326)
Recoveries | 267 | 276 | 801 | 773
Net charge-offs | (444) | (556) | (1,958) | (2,553)
Balance, end of period | $ 4,751 | $ 8,600 | $ 4,751 | 8,600
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 cards |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period |  |  |  | $ 2,232

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