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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | $ 68,244 |
Provision for credit loss expense | $ 22,981 | $ 21,973 | 68,030 | $ 38,337
Balance, end of period | 248,251 |  | 248,251 |
Loans, Excluding Acquired Loans |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 231,643 | 64,179 | 68,244 | 56,694
Provision for credit loss expense | 22,313 | 21,973 | 75,190 | 38,337
Charge-offs | (7,403) | (21,327) | (50,298) | (32,773)
Recoveries | 1,698 | 1,765 | 3,738 | 4,332
Net charge-offs | (5,705) | (19,562) | (46,560) | (28,441)
Balance, end of period | 248,251 | 66,590 | 248,251 | 66,590
Loans, Excluding Acquired Loans | Other Consumer and Other |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 12,055 | 2,381 | 2,169 | 2,419
Provision for credit loss expense | (2,844) | (528) | (3,829) | 1,320
Charge-offs | (1,091) | (1,065) | (3,062) | (3,582)
Recoveries | 366 | 1,422 | 1,110 | 2,053
Net charge-offs | (725) | 357 | (1,952) | (1,529)
Balance, end of period | 8,486 | 2,210 | 8,486 | 2,210
Loans, Excluding Acquired Loans | Commercial |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 59,138 | 21,354 | 22,863 | 20,514
Provision for credit loss expense | (6,499) | 19,150 | 42,808 | 23,980
Charge-offs | (4,327) | (17,778) | (40,537) | (22,893)
Recoveries | 936 | 65 | 1,381 | 1,190
Net charge-offs | (3,391) | (17,713) | (39,156) | (21,703)
Balance, end of period | 49,248 | 22,791 | 49,248 | 22,791
Loans, Excluding Acquired Loans | Real Estate |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 149,471 | 36,493 | 39,161 | 29,838
Provision for credit loss expense | 33,479 | 2,405 | 31,341 | 10,393
Charge-offs | (1,153) | (1,367) | (3,373) | (3,000)
Recoveries | 120 | 55 | 474 | 355
Net charge-offs | (1,033) | (1,312) | (2,899) | (2,645)
Balance, end of period | 181,917 | 37,586 | 181,917 | 37,586
Loans, Excluding Acquired Loans | Consumer | Credit cards |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 10,979 | 3,951 | 4,051 | 3,923
Provision for credit loss expense | (1,823) | 946 | 4,870 | 2,644
Charge-offs | (832) | (1,117) | (3,326) | (3,298)
Recoveries | 276 | 223 | 773 | 734
Net charge-offs | (556) | (894) | (2,553) | (2,564)
Balance, end of period | $ 8,600 | $ 4,003 | 8,600 | $ 4,003
Impact of ASU 2016-13 adoption | Loans, Excluding Acquired Loans |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 151,377 |
Impact of ASU 2016-13 adoption | Loans, Excluding Acquired Loans | Other Consumer and Other |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 12,098 |
Impact of ASU 2016-13 adoption | Loans, Excluding Acquired Loans | Commercial |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 22,733 |
Impact of ASU 2016-13 adoption | Loans, Excluding Acquired Loans | Real Estate |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 114,314 |
Impact of ASU 2016-13 adoption | 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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