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Residential Loans, at Fair Value - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Net realized gain on payoff of residential loans $ 1,600,000 $ 900,000 $ 1,700,000 $ 2,900,000  
Loss on sale of residential loans 200,000 $ 0 3,200,000 $ 0  
Residential Loans | Foreclosure          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Process of foreclosure 131,600,000   131,600,000    
Principal outstanding 155,900,000   155,900,000    
Consolidated SLST | VIE, Primary Beneficiary | Residential Loans | 90 Days or Greater Delinquent          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Principal outstanding 107,900,000   107,900,000   $ 84,600,000
Residential Loans Held in Consolidated SLST | VIE, Primary Beneficiary | Residential Loans | Foreclosure          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Process of foreclosure $ 33,600,000   $ 33,600,000