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Home Equity Investments (HEI) - Activity of HEI (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |
Net market valuation gains | $ 1,068 | $ 5,731
Redwood |  |
Schedule of Equity Method Investments [Line Items] |  |
Net market valuation gains | 3,840 | 1,192
Home Equity Investments Purchased, Fair Value |  |
Schedule of Equity Method Investments [Line Items] |  |
Net market valuation gains | 0 | 0
Home Equity Investments Purchased, Fair Value | Redwood |  |
Schedule of Equity Method Investments [Line Items] |  |
Net market valuation gains | $ 16,559 | $ 40,141

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