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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | $ 68,244 |
Provision for credit loss expense | $ 26,915 | $ 7,079 | 53,049 | $ 16,364
Balance, end of period | 231,643 |  | 231,643 |
Loans, Excluding Acquired Loans |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 243,195 | 60,555 | 68,244 | 56,694
Provision for credit loss expense | 26,678 | 7,079 | 52,875 | 16,364
Charge-offs | (39,156) | (5,182) | (42,895) | (11,446)
Recoveries | 926 | 1,727 | 2,042 | 2,567
Net charge-offs | (38,230) | (3,455) | (40,853) | (8,879)
Balance, end of period | 231,643 | 64,179 | 231,643 | 64,179
Loans, Excluding Acquired Loans | Other Consumer and Other |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 18,029 | 2,372 | 2,169 | 2,419
Provision for credit loss expense | (5,685) | 642 | (987) | 1,848
Charge-offs | (592) | (964) | (1,971) | (2,517)
Recoveries | 303 | 331 | 746 | 631
Net charge-offs | (289) | (633) | (1,225) | (1,886)
Balance, end of period | 12,055 | 2,381 | 12,055 | 2,381
Loans, Excluding Acquired Loans | Commercial |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 76,327 | 19,394 | 22,863 | 20,514
Provision for credit loss expense | 18,400 | 2,956 | 49,307 | 4,830
Charge-offs | (35,687) | (1,963) | (36,210) | (5,115)
Recoveries | 98 | 967 | 445 | 1,125
Net charge-offs | (35,589) | (996) | (35,765) | (3,990)
Balance, end of period | 59,138 | 21,354 | 59,138 | 21,354
Loans, Excluding Acquired Loans | Real Estate |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 141,022 | 34,870 | 39,161 | 29,838
Provision for credit loss expense | 10,020 | 2,681 | (2,138) | 7,988
Charge-offs | (1,824) | (1,216) | (2,220) | (1,633)
Recoveries | 253 | 158 | 354 | 300
Net charge-offs | (1,571) | (1,058) | (1,866) | (1,333)
Balance, end of period | 149,471 | 36,493 | 149,471 | 36,493
Loans, Excluding Acquired Loans | Consumer | Credit cards |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance, beginning of period | 7,817 | 3,919 | 4,051 | 3,923
Provision for credit loss expense | 3,943 | 800 | 6,693 | 1,698
Charge-offs | (1,053) | (1,039) | (2,494) | (2,181)
Recoveries | 272 | 271 | 497 | 511
Net charge-offs | (781) | (768) | (1,997) | (1,670)
Balance, end of period | $ 10,979 | $ 3,951 | 10,979 | $ 3,951
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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