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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - CECL Allowance as Percentage of Amortized Cost and Total Commitment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Allowance and Provision for Loan Credit Loss [Abstract]                
Beginning balance, specific CECL allowance, funded   $ 175,000     $ 175,000      
Quarter allowances (reversals), specific CECL allowance, funded [1] $ (29,586)   $ (25,169)   (30,824) $ 158,296    
Ending balance, specific CECL allowance, funded 145,000       145,000      
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]                
Beginning balance, General CECL allowance, funded 36,435 38,102 58,273 $ 0 38,102 0    
Quarter allowances (reversals), General CECL allowance, funded 1,764 (1,667) (13,729) 30,494        
Financing Receivable, Funded, Allowance for Write-Offs 0   0          
Ending balance, General CECL allowance, funded 38,199 36,435 44,544 58,273 38,199 44,544    
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]                
Beginning balance, General CECL allowance, unfunded 3,794 3,365 6,059 0 3,365 0    
Quarter allowances (reversals), General CECL allowance, unfunded (1,350) 429 (1,940) 2,971        
Write-offs, General CECL allowance, unfunded 0   0          
Ending balance, General CECL allowance, unfunded 2,444 3,794 4,119 6,059 2,444 4,119    
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                
General CECL Allowance 40,229 41,467 64,332 0 41,467 0    
Total quarter allowances (reversals), General CECL allowance 414 (1,238) (15,669) 33,465        
Allowance for loan and lease losses, real estate and off-balance sheet, write-offs 0   0          
General CECL Allowance 40,643 40,229 48,663 64,332 40,643 48,663    
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                
Total CECL Allowance 215,229 216,467 271,313 56,981 216,467 56,981    
Total CECL Allowance, Quarter allowances (reversals) (19,586) (1,238) (10,169) 183,465        
Total CECL allowance, Write-offs (10,000)   (15,000)          
Total CECL Allowance $ 185,643 $ 215,229 $ 246,144 $ 271,313 $ 185,643 $ 246,144    
General CECL allowance, % of amortized cost 0.57% 0.62% 0.81% 1.08% 0.57% 0.81% 0.67% 0.00%
Total CECL allowance, % of amortized cost 2.41% 3.06% 3.71% 4.05% 2.41% 3.71% 3.23% 0.00%
Adjustment due to Adoption of ASU                
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]                
Beginning balance, General CECL allowance, funded       $ 27,779   $ 27,779    
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]                
Beginning balance, General CECL allowance, unfunded       3,088   3,088    
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                
General CECL Allowance       30,867   30,867    
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                
Total CECL Allowance       30,867   30,867    
Commercial Mortgage and Subordinated Portfolio Segment                
Allowance and Provision for Loan Credit Loss [Abstract]                
Beginning balance, specific CECL allowance, funded $ 175,000 $ 175,000 $ 206,981 56,981 $ 175,000 56,981    
Quarter allowances (reversals), specific CECL allowance, funded (20,000)   5,500 150,000        
Write-offs, specific CECL allowance, funded (10,000)   (15,000)          
Ending balance, specific CECL allowance, funded $ 145,000 $ 175,000 $ 197,481 206,981 $ 145,000 197,481    
Commercial Mortgage and Subordinated Portfolio Segment | Adjustment due to Adoption of ASU                
Allowance and Provision for Loan Credit Loss [Abstract]                
Beginning balance, specific CECL allowance, funded       $ 0   $ 0    
[1] Comprised of $30,000, $30,000, $9,500 and $(140,500) Specific CECL Reversals (Allowance) for the three and six months ended June 30, 2021 and 2020, respectively, and $(414), $824, $15,669, and $(17,796) of General CECL Reversals (Allowance) for the three and six months ended June 30, 2021 and 2020, respectively.