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Residential Loans - Quarterly Activity of Residential Loans Held-for-Investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Transfers from loans held-for-sale to loans held-for-investment |  |  | $ 1,953,421 | $ 1,998,535
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 gain (loss) | $ (211,486) | $ (12,835) | (482,217) | (15,413)
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 gain (loss) | (76,735) | 22,579 | (120,503) | 19,013
Held-for-investment at fair value | Legacy Sequoia |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Net market valuation gain (loss) | 779 | 4,863 | 7,104 | 12,476
Held-for-investment at fair value | Sequoia |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Transfers from loans held-for-sale to loans held-for-investment | $ 0 | $ 1,205,494 | $ 684,491 | $ 1,205,494

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