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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%

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