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Use of Special Purpose Entities and Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Residential whole loans, carrying value [1] $ 3,932,300 $ 4,195,332
Residential whole loans, at fair value [1] 1,320,199 1,216,902
Total residential whole loans 5,200,000 5,300,000
Residential whole loans, net 3,869,056 4,108,499
Asset-backed Securities, Securitized Loans and Receivables    
Variable Interest Entity [Line Items]    
Proceeds from issuance of debt 1,852,989 1,853,408
Residential whole loans, carrying value 1,500,000 1,400,000
Residential whole loans, at fair value 311,600 382,300
Securitized debt 1,500,000 1,500,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets    
Variable Interest Entity [Line Items]    
Real estate owned at fair value 39,800 $ 49,500
Senior Bonds    
Variable Interest Entity [Line Items]    
Proceeds from issuance of debt 437,900  
Proceed from debt net of offering expenses and underwriting discount $ 437,900  
[1] Includes approximately $1.5 billion and $1.4 billion of Residential whole loans, at carrying value and $311.6 million and $382.3 million of Residential whole loans, at fair value transferred to consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020, respectively. Such assets can be used only to settle the obligations of each respective VIE.