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Residential Whole Loans (Fair Value) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Residential whole loans, at fair value $ 1,216,902 $ 1,381,583
Less than 60 Days Past Due:    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding principal balance 602,292 666,026
Aggregate fair value $ 595,521 $ 641,616
Weighted average LTV ratio 72.57% 76.69%
Number of loans | loan 3,033 3,159
60 Days to 89 Days Past Due:    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding principal balance $ 54,180 $ 58,160
Aggregate fair value $ 49,652 $ 53,485
Weighted average LTV ratio 82.11% 79.48%
Number of loans | loan 263 313
90 or more    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding principal balance $ 625,621 $ 767,320
Aggregate fair value $ 571,729 $ 686,482
Weighted average LTV ratio 86.78% 89.69%
Number of loans | loan 2,326 2,983