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Residential Loans and Residential Loans Held for Sale, at Fair Value - Schedule of Components of Net Gain (Loss) on Residential Mortgage Loans at Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
VIE, Primary Beneficiary | Consolidated SLST |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Unrealized gains (losses), net | $ 7,395 | $ 28,655 | $ 37,100 | $ 27,855
Residential loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Unrealized gains (losses), net | 6,575 | 9,882 | 14,552 | 13,934
Residential loans held in securitization trusts |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Unrealized gains (losses), net | $ 12,958 | $ 42,283 | $ 45,711 | $ 32,995

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