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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - CECL Allowance as Percentage of Amortized Cost and Total Commitment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 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] $ (5,766)     $ (6,342)     (36,590) $ 151,954    
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 38,199 $ 36,435 38,102 44,544 $ 58,273 $ 0 38,102 0    
Quarter allowances (reversals), General CECL allowance, funded (5,515) 1,764 (1,667) (5,268) (13,729) 30,494        
Financing Receivable, Funded, Allowance for Write-Offs   0     0          
Ending balance, General CECL allowance, funded 32,684 38,199 36,435 39,276 44,544 58,273 32,684 39,276    
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]                    
Beginning balance, General CECL allowance, unfunded 2,444 3,794 3,365 4,119 6,059 0 3,365 0    
Quarter allowances (reversals), General CECL allowance, unfunded (251) (1,350) 429 (524) (1,940) 2,971        
Write-offs, General CECL allowance, unfunded   0     0          
Ending balance, General CECL allowance, unfunded 2,193 2,444 3,794 3,595 4,119 6,059 2,193 3,595    
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                    
General CECL Allowance 40,643 40,229 41,467 48,663 64,332 0 41,467 0    
Total quarter allowances (reversals), General CECL allowance (5,766) 414 (1,238) (5,792) (15,669) 33,465        
Allowance for loan and lease losses, real estate and off-balance sheet, write-offs   0     0          
General CECL Allowance 34,877 40,643 40,229 42,871 48,663 64,332 34,877 42,871    
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                    
Total CECL Allowance 185,643 215,229 216,467 246,144 271,313 56,981 216,467 56,981    
Total CECL Allowance, Quarter allowances (reversals) (5,766) (19,586) (1,238) (6,342) (10,169) 183,465        
Total CECL allowance, Write-offs   (10,000)     (15,000)          
Total CECL Allowance $ 179,877 $ 185,643 $ 215,229 $ 239,802 $ 246,144 $ 271,313 $ 179,877 $ 239,802    
General CECL allowance, % of amortized cost 0.51% 0.62% 0.62% 0.71% 0.81% 1.08% 0.51% 0.71% 0.67% 0.00%
Total CECL allowance, % of amortized cost 2.43% 3.06% 3.06% 3.59% 3.71% 4.05% 2.43% 3.59% 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 $ 145,000 $ 175,000 $ 175,000 $ 197,481 $ 206,981 56,981 $ 175,000 56,981    
Quarter allowances (reversals), specific CECL allowance, funded 0 (20,000)   (550) 5,500 150,000        
Write-offs, specific CECL allowance, funded (10,000) (10,000)     (15,000)          
Ending balance, specific CECL allowance, funded $ 145,000 $ 145,000 $ 175,000 $ 196,931 $ 197,481 206,981 $ 145,000 196,931    
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 $0, $30,000, $550 and $(139,950) Specific CECL Reversals (Allowance) for the three and nine months ended September 30, 2021 and 2020, respectively, and $5,766, $6,590, $5,792, and $(12,004) of General CECL Reversals (Allowance) for the three and nine months ended September 30, 2021 and 2020, respectively.