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Home Equity Investments (HEI) - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Home equity investments | $ 340,437 |  | $ 340,437 |  | $ 192,740
Investment fair value changes, net | (57,697) | $ 26,077 | (151,789) | $ 120,644 |
Point HEI |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Interest expense | 1,000 |  | 3,000 |  |
Commitment To Acquire HEIs |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Cumulative commitment | 149,000 |  | 149,000 |  |
Commitment To Fund Investment | Point HEI |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment fair value changes, net | (5,000) |  | (2,000) |  |
Shared home appreciation options | Redwood |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Home equity investments | 200,709 |  | 200,709 |  | 33,187
Shared home appreciation options | Point HEI |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Home equity investments | 139,728 |  | 139,728 |  | $ 159,553
Investment Fair Value Changes, Net |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment fair value changes, net | $ (1,000) |  |  |  |
Investment Fair Value Changes, Net | Point HEI |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment fair value changes, net |  |  | $ 4,000 |  |

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