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Residential Loans, at Fair Value - Differences Between Fair Value and Aggregate Unpaid Principal (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Fair Value | $ 3,103,105 | $ 3,084,303
Residential loans |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Fair Value | 640,729 | 827,535
Residential loans | Greater than 90 days past due |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Fair Value | 181,732 | 199,485
Unpaid Principal Balance | 209,601 | 220,577
Residential loans | Less than 90 days past due |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Fair Value | 9,632 | 9,362
Unpaid Principal Balance | $ 10,254 | $ 9,948

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