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Home Equity Investments (HEI) - Activity of HEI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation gains (losses) | $ 4,212 | $ (724) | $ 8,418 | $ 8,587
Redwood |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation gains (losses) | 9,290 | (4,774) | 21,598 | (1,986)
Home Equity Investments Purchased, Fair Value |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation gains (losses) | 0 | 0 | 0 | 0
Home Equity Investments Purchased, Fair Value | Redwood |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation gains (losses) | $ 113 | $ 79,050 | $ 25,626 | $ 176,439

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