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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
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allowance and Provision for Loan Credit Loss [Abstract]      
Beginning balance, specific CECL allowance, funded $ 145,000    
Ending balance, specific CECL allowance, funded 133,500 $ 145,000  
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 (7,364) (4,514)  
Write-offs, specific CECL allowance, funded 0 0  
Ending balance, General CECL allowance, funded 26,224 33,588  
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 1,241 (259)  
Financing receivable, funded, allowance for write-offs 0 0  
Ending balance, General CECL allowance, unfunded 4,347 3,106  
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]      
General CECL Allowance 36,694 41,467  
Allowance for loan and lease losses, real estate and off-balance sheet, write-offs 0 0  
General CECL Allowance 30,571 36,694  
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]      
Total CECL Allowance 181,694 216,467  
Total CECL Allowance, Quarter allowances (reversals) 7,273 (24,773)  
Total CECL allowance, Write-offs (24,896) (10,000)  
Total CECL Allowance $ 164,071 $ 181,694  
General CECL allowance, % of amortized cost 0.36% 0.49% 0.67%
Total CECL allowance, % of amortized cost 1.86% 2.26% 3.23%
General CECL (allowance) reversal $ (6,100) $ (4,800)  
Commercial Mortgage and Subordinated Portfolio Segment      
Allowance and Provision for Loan Credit Loss [Abstract]      
Beginning balance, specific CECL allowance, funded 145,000 175,000  
Increase (decrease) in current expected credit loss allowance, net 13,396 (20,000)  
Write-offs, specific CECL allowance, funded (24,896) (10,000)  
Ending balance, specific CECL allowance, funded 133,500 145,000  
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]      
Total quarter allowances (reversals), General CECL allowance $ (6,123) $ (4,773)