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Residential Loans - Activity of Residential Loans Held-for-Sale (Details) - Residential Loans - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal balance of loans acquired | $ 4,374,201 | $ 5,732,699
Principal balance of loans sold | 6,463,741 | 6,069,518
Gain (loss) on assets measured at fair value on a non-recurring basis | $ (15,477) | $ 3,267

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