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Residential Loans, at Fair Value - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Net realized gain on payoff and sale of mortgage loans $ 2,200,000 $ 4,600,000 $ 10,000,000.0
Loss on sale of residential loans (1,000,000.0) (800,000) $ 0
Principal outstanding 300,138,000    
Foreclosure | Residential loans      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Process of foreclosure 136,900,000    
Principal outstanding 156,800,000    
Foreclosure | VIE, Primary Beneficiary | Residential loans | Residential Loans Held in Consolidated SLST      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Process of foreclosure 39,600,000    
90 Days or Greater Delinquent | Residential loans      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Principal outstanding 183,067,000 220,577,000  
90 Days or Greater Delinquent | VIE, Primary Beneficiary | Residential loans | Consolidated SLST      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Principal outstanding $ 117,100,000 $ 84,600,000