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Participations Sold - Schedule of participations sold (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Participating Mortgage Loans [Line Items]          
Participations sold $ 26,948   $ 26,948   $ 34,974
Payment in kind interest 10,200 $ 12,500 40,700 $ 37,300  
Commercial Mortgage Portfolio Segment          
Participating Mortgage Loans [Line Items]          
Participations sold 26,948   26,948   9,217
Subordinate Mortgage Portfolio Segment          
Participating Mortgage Loans [Line Items]          
Participations sold $ 0   0   25,757
Payment in kind interest     $ 0   $ 800