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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 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance and Provision for Loan Credit Loss [Abstract]              
Beginning balance, specific CECL allowance, funded         $ 133,500    
Write-offs, specific CECL allowance, funded         (81,890) $ (7,000)  
Ending balance, specific CECL allowance, funded     $ 133,500   193,000 133,500  
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]              
Beginning balance, General CECL allowance, funded         26,224 33,588  
Quarter allowances (reversals), General CECL allowance, funded         258 (7,364)  
Quarter writeoff, General CECL allowance, funded         0 0  
Ending balance, General CECL allowance, funded     26,224   26,482 26,224  
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]              
Beginning balance, General CECL allowance, unfunded         4,347 3,106  
Quarter allowances (reversals), General CECL allowance, unfunded         (330) 1,241  
Quarter writeoff, General CECL allowance, unfunded         0 0  
Ending balance, General CECL allowance, unfunded     4,347   4,017 4,347  
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]              
General CECL Allowance         30,571 36,694  
General CECL Allowance     30,571   30,499 30,571  
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]              
Total CECL Allowance         164,071 181,694  
Total CECL Allowance, Quarter allowances (reversals)         141,408 7,273  
Total CECL Allowance, writeoff         (81,980) (24,896)  
Total CECL Allowance     $ 164,071   $ 223,499 $ 164,071  
General CECL allowance, % of amortized cost     0.36%   0.38% 0.36% 0.49%
Total CECL allowance, % of amortized cost     1.86%   2.61% 1.86% 2.26%
Residential-for-Sale - Manhattan, NY              
Allowance and Provision for Loan Credit Loss [Abstract]              
Write-offs, specific CECL allowance, funded     $ (7,000) $ (7,000)      
Commercial Mortgage and Subordinated Portfolio Segment              
Allowance and Provision for Loan Credit Loss [Abstract]              
Beginning balance, specific CECL allowance, funded         $ 133,500 $ 145,000  
Increase (decrease) in current expected credit loss allowance, net         141,480 13,396  
Write-offs, specific CECL allowance, funded $ (82,000) $ (82,000)     (81,980) (24,896)  
Ending balance, specific CECL allowance, funded     $ 133,500   193,000 133,500  
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]              
Total quarter allowances (reversals), General CECL allowance         (72) (6,123)  
General CECL Allowance writeoff         $ 0 $ 0