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Portfolio Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 12, 2020
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year | $ 43,288 | $ 43,288 |  |  |
Balance, end of year |  |  | $ 43,288 |  |
Non-Covered Loans |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year | 42,567 | 42,567 | 42,295 | $ 38,166 |
CECL adoption | 28,387 |  |  |  |
PCD loans immediately charged off | (1,680) | (63,400) | (6,700) |  |
Provision for loan losses |  | 63,379 | 6,682 | 9,813 |
Initial Allowance on Acquired PCD Loans |  |  |  |  | $ 3,524
Charge-offs |  | (6,739) | (8,594) | (7,976) |
Recoveries |  | 6,512 | 2,184 | 2,292 |
Balance, end of year | 69,995 | 136,671 | 42,567 | 42,295 |
Financing Receivable, Allowance For Credit Losses, Organic |  |  | 42,567 |  |
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired |  |  | 721 |  |
Non-Covered Loans | Commercial and industrial |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year | 27,296 | 27,296 | 29,039 | 26,406 |
CECL adoption | 6,494 |  |  |  |
PCD loans immediately charged off | 0 |  |  |  |
Provision for loan losses |  | 28,373 | 4,801 | 8,394 |
Initial Allowance on Acquired PCD Loans |  |  |  |  | 23
Charge-offs |  | (5,381) | (6,882) | (6,894) |
Recoveries |  | 1,848 | 338 | 1,133 |
Balance, end of year | 33,949 | 58,812 | 27,296 | 29,039 |
Financing Receivable, Allowance For Credit Losses, Organic |  |  | 27,296 |  |
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired |  |  | 159 |  |
Non-Covered Loans | Commercial - investor owned |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year | 5,935 | 5,935 | 4,683 | 3,890 |
CECL adoption | 10,726 |  |  |  |
PCD loans immediately charged off | (5) |  |  |  |
Provision for loan losses |  | 11,037 | 1,708 | 709 |
Initial Allowance on Acquired PCD Loans |  |  |  |  | 2,026
Charge-offs |  | (498) | (551) | 0 |
Recoveries |  | 2,841 | 95 | 84 |
Balance, end of year | 16,656 | 32,062 | 5,935 | 4,683 |
Financing Receivable, Allowance For Credit Losses, Organic |  |  | 5,935 |  |
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired |  |  | 0 |  |
Non-Covered Loans | CRE - owner occupied |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year | 4,873 | 4,873 | 4,239 | 3,308 |
CECL adoption | 2,598 |  |  |  |
PCD loans immediately charged off | (57) |  |  |  |
Provision for loan losses |  | 7,845 | 673 | 1,216 |
Initial Allowance on Acquired PCD Loans |  |  |  |  | 1,427
Charge-offs |  | (30) | (58) | (313) |
Recoveries |  | 356 | 19 | 28 |
Balance, end of year | 7,414 | 17,012 | 4,873 | 4,239 |
Financing Receivable, Allowance For Credit Losses, Organic |  |  | 4,873 |  |
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired |  |  | 0 |  |
Non-Covered Loans | Construction and land development |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year | 2,472 | 2,472 | 1,987 | 1,487 |
CECL adoption | 5,183 |  |  |  |
PCD loans immediately charged off | (217) |  |  |  |
Provision for loan losses |  | 13,438 | (237) | 97 |
Initial Allowance on Acquired PCD Loans |  |  |  |  | 45
Charge-offs |  | (31) | (54) | (56) |
Recoveries |  | 384 | 776 | 459 |
Balance, end of year | 7,577 | 21,413 | 2,472 | 1,987 |
Financing Receivable, Allowance For Credit Losses, Organic |  |  | 2,472 |  |
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired |  |  | 139 |  |
Non-Covered Loans | Residential real estate |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year | 1,280 | 1,280 | 1,616 | 2,237 |
CECL adoption | 3,470 |  |  |  |
PCD loans immediately charged off | (1,401) |  |  |  |
Provision for loan losses |  | 674 | (330) | (583) |
Initial Allowance on Acquired PCD Loans |  |  |  |  | 3
Charge-offs |  | (408) | (667) | (546) |
Recoveries |  | 967 | 661 | 508 |
Balance, end of year | 3,349 | 4,585 | 1,280 | 1,616 |
Financing Receivable, Allowance For Credit Losses, Organic |  |  | 1,280 |  |
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired |  |  | 0 |  |
Non-Covered Loans | Other |  |  |  |  |
Allowance for Loan Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year | 711 | 711 | 731 | 838 |
CECL adoption | (84) |  |  |  |
PCD loans immediately charged off | 0 |  |  |  |
Provision for loan losses |  | 2,012 | 67 | (20) |
Initial Allowance on Acquired PCD Loans |  |  |  |  | $ 0
Charge-offs |  | (391) | (382) | (167) |
Recoveries |  | 116 | 295 | 80 |
Balance, end of year | $ 1,050 | $ 2,787 | 711 | $ 731 |
Financing Receivable, Allowance For Credit Losses, Organic |  |  | 711 |  |
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired |  |  | $ 423 |  |

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