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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2020
USD ($)
Jul. 31, 2020
GBP (£)
May 31, 2020
USD ($)
Jan. 31, 2020
USD ($)
Jan. 31, 2020
GBP (£)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Percentage of loan portfolio                 100.00%   100.00%
Increase (decrease) in General CECL Allowance           $ (5,800)     $ 12,000    
Interest receivable           38,401     38,401   $ 35,581
Amortized cost of loans in cost recovery           408,666     408,666   $ 136,300
Interest received for loans in cost recovery           300     1,600    
Specific CECL allowance           550     (139,950)    
Payment in kind interest           12,500   $ 13,700 37,300 $ 42,800  
Proceeds from pre-payment penalties or accelerated fees           0   $ 300 200 $ 4,000  
Sale of Mezzanine Loan                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Proceeds from sale of loan       $ 81,300 £ 62.2            
Sale of Unfunded Commitment of Senior Mortgage                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Proceeds from sale of loan       $ 65,300 £ 50.0            
Sale of Construction Loan Interests                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Commitments sold     $ 376,900                
Funded amount of interests sold     $ 127,000                
Percentage agreed to indemnify each buyer on loss     10.00%                
Realized loss     $ 1,400                
Sale of Inventory Loan                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Realized loss $ 1,000                    
Outstanding principal on loan $ 124,200 £ 97.5                  
Commercial Mortgage and Subordinated Portfolio Segment                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Specific CECL allowance                 (139,950)    
Subordinate Mortgage Portfolio Segment                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Maximum exposure to loss           68,100     $ 68,100    
Maximum exposure to loss, term                 6 years 25 days    
Floating Rate Loan                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Percentage of loan portfolio                 95.00%   95.00%
Hotel - New York City                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Amortized cost of loans in cost recovery           144,500     $ 144,500    
Borrower contributed additional equity                 15,000    
Principal Amount           $ 142,800     $ 142,800    
Specific CECL allowance             $ 15,000