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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 | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance, beginning of period | $ 68,244 |  |
Balance, end of period | 238,050 | $ 68,244 |
Loans, Excluding Acquired Loans |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance, beginning of period | 68,244 | 56,694 | $ 42,086
Provision for credit loss expense | 82,488 | 43,240 | 38,148
Charge-offs | (70,659) | (36,836) | (26,838)
Recoveries | 6,600 | 5,146 | 3,298
Net charge-offs | (64,059) | (31,690) | (23,540)
Balance, end of period | 238,050 | 68,244 | 56,694
Loans, Excluding Acquired Loans | Other Consumer and Other |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance, beginning of period | 2,169 | 2,419 | 3,596
Provision for credit loss expense | (6,093) | 2,400 | 4,941
Charge-offs | (4,022) | (5,007) | (6,675)
Recoveries | 1,465 | 2,357 | 557
Net charge-offs | (2,557) | (2,650) | (6,118)
Balance, end of period | 5,617 | 2,169 | 2,419
Loans, Excluding Acquired Loans | Commercial |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance, beginning of period | 22,863 | 20,514 | 7,007
Provision for credit loss expense | 42,017 | 24,434 | 21,176
Charge-offs | (48,736) | (23,352) | (8,414)
Recoveries | 3,216 | 1,267 | 745
Net charge-offs | (45,520) | (22,085) | (7,669)
Balance, end of period | 42,093 | 22,863 | 20,514
Loans, Excluding Acquired Loans | Real Estate |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance, beginning of period | 39,161 | 29,838 | 27,699
Provision for credit loss expense | 42,276 | 12,714 | 8,846
Charge-offs | (13,788) | (3,892) | (7,698)
Recoveries | 905 | 501 | 991
Net charge-offs | (12,883) | (3,391) | (6,707)
Balance, end of period | 182,868 | 39,161 | 29,838
Loans, Excluding Acquired Loans | Consumer | Credit Card |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance, beginning of period | 4,051 | 3,923 | 3,784
Provision for credit loss expense | 4,288 | 3,692 | 3,185
Charge-offs | (4,113) | (4,585) | (4,051)
Recoveries | 1,014 | 1,021 | 1,005
Net charge-offs | (3,099) | (3,564) | (3,046)
Balance, end of period | 7,472 | 4,051 | $ 3,923
Impact of ASU 2016-13 adoption | Loans, Excluding Acquired Loans |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance, beginning of period | 151,377 |  |
Balance, end 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 |  |
Balance, end 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 |  |
Balance, end 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 |  |
Balance, end of period |  | 114,314 |
Impact of ASU 2016-13 adoption | Loans, Excluding Acquired Loans | Consumer | Credit Card |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance, beginning of period | $ 2,232 |  |
Balance, end of period |  | $ 2,232 |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details
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