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Residential Consumer Loans - Schedule of Quarterly Activity of Residential Consumer Loans Held-for-Investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal value of loans transferred from HFS to HFI |  |  | $ 4,553,378 | $ 2,009,030
Held-for-investment at fair value | Sequoia |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Net market valuation gains (losses) recorded | $ 256,034 | $ (177,253) | 152,635 | (162,895)
Held-for-investment at fair value | Freddie Mac SLST |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Net market valuation gains (losses) recorded | 53,555 | (51,046) | 38,154 | (62,756)
Held-for-investment at fair value | Sequoia |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal value of loans transferred from HFS to HFI | $ 1,528,163 | $ 337,752 | $ 4,140,150 | $ 995,047

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