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Residential Loans - Quarterly Activity of Residential Loans Held-for-Sale (Details) - Residential Loans - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal balance of loans acquired | $ 3,484,633 | $ 57,743 | $ 6,580,681 | $ 2,687,651
Principal balance of loans sold | 3,324,919 | 2,280,076 | 5,600,751 | 4,936,795
Net market valuation gains (losses) recorded | $ 26,278 | $ (2,014) | $ 49,707 | $ (15,494)

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