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Residential Loans, at Fair Value - Components of Net Gain (Loss) on Residential Mortgages (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Consolidated SLST | VIE, Primary Beneficiary        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Unrealized (losses) gains, net $ (33,188) $ 6,287 $ (110,631) $ (12,585)
Residential loans        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Unrealized (losses) gains, net (57,134) 8,280 (112,736) 15,715
Residential loans held in securitization trusts        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Unrealized (losses) gains, net $ (67,141) $ 11,794 $ (139,798) $ 28,936