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Residential Loans - Activity of Residential Loans Held-for-Investment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 | $ 5,026,723 | $ 1,868,656 | $ 1,801,560
Residential loans, held-for-investment | Sequoia |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Valuation adjustments | (66,727) | (30,356) |
Residential loans, held-for-investment | Freddie Mac SLST(1) |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Valuation adjustments | (14,735) | 35,131 |
Residential loans, held-for-investment | Legacy Sequoia |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Valuation adjustments | 12,125 | (30,900) |
Residential loans, held-for-investment | 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 | 3,035,100 | 270,506 |
Residential loans, held-for-investment | Redwood |  |  |
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 | 13,258 |
Transfers from loans held-for-investment to loans held-for-sale | 0 | 1,870,986 |
Gain (loss) on assets measured at fair value on a non-recurring basis | $ 0 | $ (93,314) |

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- Definition Amount of financing receivable reclassified to held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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