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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal balance of loans acquired | $ 172,162 | $ 1,446,750 | $ 2,859,813 | $ 3,936,111
Principal balance of loans sold | 87,868 | 1,534,315 | 5,024,663 | 3,921,280
Net market valuation gains (losses) recorded | $ (478) | $ (6,623) | $ (15,972) | $ 286

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