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Residential Loans - Quarterly Activity of Residential Loans Held-for-Sale (Details) - Residential Loans - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal balance of loans acquired | $ 3,167,186 | $ 172,162 | $ 9,747,867 | $ 2,859,813
Principal balance of loans sold | 2,360,862 | 87,868 | 6,787,490 | 4,750,615
Principal balance of loans transferred to HFI | 448,878 | 0 | 1,623,000 | 274,048
Net market valuation gains (losses) recorded | $ 9,861 | $ (478) | $ 59,568 | $ (15,972)

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