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Residential Loans - Schedule of Delinquencies of Residential Loans (Details) - Residential mortgage loans held in securitization trusts and real estate owned held in residential securitization
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
loans
Dec. 31, 2019
USD ($)
loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Delinquent Loans 18  
Number Of Delinquent Loans, Real estate through foreclosure   1
Unpaid Principal, Real estate owned through foreclosure | $   $ 360
% Of Loan Portfolio, Real estate owned through foreclosure   0.76%
Financial Asset, 30 to 59 Days Past Due    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Delinquent Loans   2
Total Unpaid Principal | $   $ 211
% of Loan Portfolio   0.44%
Financial Asset, Equal to or Greater than 90 Days Past Due    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Number of Delinquent Loans   16
Total Unpaid Principal | $   $ 10,010
% of Loan Portfolio   21.05%