Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis (Details) - Non-Recurring Fair Value Measurements - USD ($) $ in Thousands |
Sep. 30, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Assets: | ||
| Total assets at fair value | $ 1,176,346 | $ 405,196 |
| Liabilities: | ||
| Total liabilities at fair value | 1,176,768 | 412,490 |
| Real Estate Owned | ||
| Assets: | ||
| Total assets at fair value | 757 | 852 |
| Ginnie Mae | ||
| Assets: | ||
| Total assets at fair value | 1,175,589 | 404,344 |
| Liabilities: | ||
| Total liabilities at fair value | 1,176,768 | 412,490 |
| Level 2 | ||
| Assets: | ||
| Total assets at fair value | 1,175,589 | 404,344 |
| Liabilities: | ||
| Total liabilities at fair value | 1,176,768 | 412,490 |
| Level 2 | Ginnie Mae | ||
| Assets: | ||
| Total assets at fair value | 1,175,589 | 404,344 |
| Liabilities: | ||
| Total liabilities at fair value | 1,176,768 | 412,490 |
| Level 3 | ||
| Assets: | ||
| Total assets at fair value | 757 | 852 |
| Level 3 | Real Estate Owned | ||
| Assets: | ||
| Total assets at fair value | $ 757 | $ 852 |