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Residential Loans, Net - Delinquencies in Portfolio of Residential Mortgage Loans Held in Securitization Trusts (Details) - Residential mortgage loans held in securitization trusts and real estate owned held in residential securitization trusts
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
loan
Financing Receivable, Past Due [Line Items]  
Number of Delinquent Loans 18
Real estate owned through foreclosure, Number of Delinquent Loans 1
Real estate owned through foreclosure, Total Unpaid Principal | $ $ 360
Real estate owned through foreclosure, % of Loan Portfolio 0.76%
30 to 60  
Financing Receivable, Past Due [Line Items]  
Number of Delinquent Loans 2
Total Unpaid Principal | $ $ 211
% of Loan Portfolio 0.44%
90 +  
Financing Receivable, Past Due [Line Items]  
Number of Delinquent Loans 16
Total Unpaid Principal | $ $ 10,010
% of Loan Portfolio 21.05%