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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
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Allowance and Provision for Loan Credit Loss [Abstract]        
Beginning balance, specific CECL allowance, funded $ 145,000      
Quarter allowances (reversals), specific CECL allowance, funded [1] 18,611 $ (1,238)    
Ending balance, specific CECL allowance, funded 175,000      
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]        
Beginning balance, General CECL allowance, funded 33,588 38,102    
Quarter allowances (reversals), General CECL allowance, funded (12,211) (1,667)    
Ending balance, General CECL allowance, funded 21,377 36,435    
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]        
Beginning balance, General CECL allowance, unfunded 3,106 3,365    
Quarter allowances (reversals), General CECL allowance, unfunded 822 429    
Ending balance, General CECL allowance, unfunded 3,928 3,794    
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]        
General CECL Allowance 36,694 41,467    
Total quarter allowances (reversals), General CECL allowance (11,389) (1,238)    
General CECL Allowance 25,305 40,229    
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]        
Total CECL Allowance 181,694 216,467    
Total CECL Allowance, Quarter allowances (reversals) 18,611 (1,238)    
Total CECL Allowance $ 200,305 $ 215,229    
General CECL allowance, % of amortized cost 0.32% 0.62% 0.49% 0.67%
Total CECL allowance, % of amortized cost 2.34% 3.06% 2.26% 3.23%
Commercial Mortgage and Subordinated Portfolio Segment        
Allowance and Provision for Loan Credit Loss [Abstract]        
Beginning balance, specific CECL allowance, funded $ 145,000 $ 175,000    
Quarter allowances (reversals), specific CECL allowance, funded 30,000 0    
Ending balance, specific CECL allowance, funded $ 175,000 $ 175,000    
[1] Comprised of $30,000 and $0 Specific CECL Allowance and $11,389 and $1,238 of General CECL Reversals for the three months ended March 31, 2022 and 2021, respectively.