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Residential Loans, Net - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
loan
securitization
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Allowance for loan losses $ 3,500   $ 3,508 $ 3,759
Allowance for loan losses, basis points 7.43%      
Number of securitizations | securitization 3      
CDOs outstanding $ 4,900 $ 98,000    
Residential collateralized debt obligations        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Collateralized debt obligations $ 40,400 $ 268,800    
Weighted average interest rate 2.41% 3.57%    
Distressed residential mortgage loans        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans pledged as collateral $ 80,600      
Residential mortgage loans held in securitization trusts and real estate owned held in residential securitization trusts        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Number of delinquent loans | loan 18      
Principal amount of delinquent loans $ 10,200      
Residential mortgage loans held in securitization trusts and real estate owned held in residential securitization trusts | Payment Deferral        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Principal amount of delinquent loans $ 6,700      
Delinquent loans under modified payment, percent 66.00%      
Financial Asset Acquired with Credit Deterioration | Distressed residential mortgage loans        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Distressed residential mortgage loans held in securitization trusts, carrying amount $ 158,700