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Residential Loans - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2020
loans
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
loans
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                          
Net realized gain (loss) on payoff and sale of mortgage loans                   $ 18,100 $ 2,900 $ 4,200  
Principal outstanding $ 406,293                 406,293      
Payments to acquire other investments                   477 991 183  
Unrealized (losses) gains, net 1,861 $ (1,067) $ (934) $ (147,918) $ 86 $ 6,102 $ 4,448 $ 22,006   (148,058) 32,642 (7,775)  
Allowance for loan losses         3,508           $ 3,508 $ 3,759 $ 4,191
Allowance for loan losses, basis points                     74300.00%    
Distressed residential mortgage loans | Financial Asset Acquired with Credit Deterioration                          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                          
Distressed residential mortgage loans, net, held in securitization trusts         158,700           $ 158,700    
Residential mortgage loans held in securitization trusts and real estate owned held in residential securitization                          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                          
Principal outstanding         10,200           10,200    
Number of delinquent loans | loans                 18        
Residential mortgage loans held in securitization trusts and real estate owned held in residential securitization | Payment Deferral                          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                          
Principal outstanding         $ 6,700           $ 6,700    
Modified percent         66.00%           66.00%    
Consolidated SLST                          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                          
Proceeds from sale of other investments                   62,600      
Unrealized (losses) gains, net                   2,400      
Consolidated SLST | VIE, Primary Beneficiary                          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                          
Variable interest entity, primary beneficiary, maximum loss exposure, amount 212,100       $ 276,800         212,100 $ 276,800    
Payments to acquire other investments                   40,000      
Financial Asset, Equal to or Greater than 90 Days Past Due | Residential mortgage loans held in securitization trusts and real estate owned held in residential securitization                          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                          
Number of delinquent loans | loans                     16    
Residential Mortgage Loans | Financial Asset, Equal to or Greater than 90 Days Past Due | VIE, Primary Beneficiary                          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                          
Principal outstanding $ 236,700       $ 50,700         $ 236,700 $ 50,700