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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Total damages including punitive $ 70,000  
Unfunded loan commitments 1,182,992 $ 1,399,989
Commercial Mortgage and Subordinated Portfolio Segment    
Schedule of Equity Method Investments [Line Items]    
Unfunded loan commitments $ 1,200,000  
Term of unfunded loan commitment 3 years 6 months