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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 15, 2019 | May 31, 2014 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2014 | Dec. 31, 2013
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Risk-sharing arrangement term |  |  |  |  |  |  | 10 years |
SPE, assets |  |  | $ 48,000 | $ 48,000 | $ 47,000 |  |  |
SPE, liabilities |  |  | 14,000 | $ 14,000 | 17,000 |  |  |
Incentive Plan, awards vesting period (in years) | 2 years |  |  |  |  |  |  |
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 |  |  |  | $ 700 | 600 | $ 500 |  |
Lease liability |  |  | 13,443 | 13,443 | 0 |  |  |
Right-of-use asset |  |  | $ 11,866 | $ 11,866 | $ 0 |  |  |
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 |  |  |  |  |  |
5 Arches, LLC |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Minority interest, percentage |  |  |  |  | 20.00% |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
VIE, ownership interest rate |  |  | 80.00% |  |  |  |  |

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