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Residential Loans - Activity of Residential Loans Held-for-Sale (Details) - Residential Loans $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) securitization | Dec. 31, 2020 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal balance of loans acquired (1) | $ 12,916,155 | $ 4,374,201
Principal balance of loans sold | 8,244,221 | 6,463,741
Principal balance of loans transferred to HFI | 2,957,694 | 274,048
Gain (loss) on assets measured at fair value on a non-recurring basis | 76,144 | $ (15,477)
Legacy Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal balance of loans acquired (1) | $ 200,000 |
Number of seasoned securitizations | securitization | 7 |

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