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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2020 | May 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2013 | Dec. 31, 2015
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
VIE, ownership interest rate |  |  |  | 80.00% |  |  |  |  |
Risk-sharing arrangement term |  |  |  |  |  |  |  |  | 10 years
SPE, assets | $ 46,000 |  | $ 46,000 |  | $ 46,000 | $ 48,000 |  |  |
SPE, liabilities | 10,000 |  | $ 10,000 |  | $ 10,000 | 14,000 |  |  |
Incentive Plan, mandatory holding period before awards vest |  | 3 years |  |  |  |  |  |  |
Employee Stock Purchase Plan, percentage of common stock fair value that employees can purchase |  |  |  |  |  |  |  | 85.00% |
Employees maximum 401(k) contribution |  |  |  |  | 100.00% |  |  |  |
Employer matching contributions |  |  |  |  | $ 1,100 | $ 700 | $ 600 |  |
Cash Based Retention Award |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash based retention awards granted |  |  |  | $ 8,000 |  |  |  |  |
Cash based retention awards, term |  |  | 3 years | 3 years |  |  |  |  |
Cash Based Retention Award | Certain Executives and Non-Executive Employees |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash based retention awards granted |  |  |  | $ 2,000 |  |  |  |  |
Long Term Relative TSR Performance Vesting Cash Awards |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash based retention awards, service period |  |  |  | 3 years |  |  |  |  |
Cash-Settled Deferred Stock Units |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash based retention awards granted | $ 2,000 |  | $ 2,000 |  | $ 2,000 |  |  |  |
Cash based retention awards, term | 4 years |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of losses assumed on pool of loans sold |  |  |  |  |  |  |  |  | 1.00%
Incentive Plan, awards vesting period (in years) |  | 3 years |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of losses assumed on pool of loans sold |  |  |  |  |  |  |  |  | 2.25%
Incentive Plan, awards vesting period (in years) |  | 4 years |  |  |  |  |  |  |

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