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Residential Loans, at Fair Value - Components of Net Gain (Loss) on Residential Mortgages (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
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 $ 15,807 $ (66,645)
Residential loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Unrealized (losses) gains, net (1,307) (25,524)
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 $ 30,554 $ (37,774)