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Residential Loans - Quarterly Activity of Residential Loans Held-for-Sale (Details) - Residential Loans $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) securitization
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal balance of loans acquired | $ 857,974 | $ 336,698 | $ 1,092,992 | $ 3,597,339
Principal balance of loans sold | 53,743 | 662,302 | 235,821 | 3,727,993
Principal balance of loans transferred to HFI | 337,752 | 0 | 995,047 | 687,192
Net market valuation gains (losses) recorded | $ (8,683) | $ (26,674) | $ (2,590) | (90,652)
Legacy Sequoia |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal balance of loans acquired |  |  |  | $ 102,000
Number of seasoned securities | securitization |  |  |  | 3

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