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Residential Loans - Quarterly Activity of Residential Loans Held-for-Investment (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
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 | $ 873,093 | $ 1,098,459
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) | 61,867 | (270,731)
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) | 32,437 | (43,768)
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) | (463) | 6,325
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 | $ 657,295 | $ 684,491

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- Definition Amount of increase (decrease) in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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