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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 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Allowance and Provision for Loan Credit Loss [Abstract]                  
Beginning balance, Specific CECL Allowance     $ 30,836       $ 30,836    
Allowances (Reversals), net       $ 127,512          
Write-offs, specific CECL allowance, funded             (6,200) $ (127,512)  
Ending balance, Specific CECL Allowance $ 39,257     342,500     39,257 30,836  
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]                  
Beginning balance, General CECL Allowance, Funded 38,848 $ 34,712 30,836 35,319 $ 32,558 $ 26,482 30,836 26,482  
Allowances (Reversals), net 409 4,136 3,876 (1,127) 2,761 6,076      
Quarter writeoff, General CECL allowance, funded 0     0          
Ending balance, General CECL Allowance, Funded 39,257 38,848 34,712 34,192 35,319 32,558 39,257 30,836  
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]                  
Beginning balance, General CECL Allowance, Unfunded 5,057 6,080 5,948 3,622 3,625 4,017 5,948 4,017  
Allowances (Reversals), net 725 (1,023) 132 228 (3) (392)      
Quarter writeoff, General CECL allowance, unfunded 0     0          
Ending balance, General CECL Allowance, Unfunded 5,782 5,057 6,080 3,850 3,622 3,625 5,782 5,948  
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                  
Beginning balance, General CECL Allowance 43,905 40,792 36,784 38,941 36,183 30,499 36,784 30,499  
Allowances (Reversals), net 1,134 3,113 4,008 (899) 2,758 5,684      
General CECL Allowance writeoff 0     0          
Ending balance,General CECL Allowance 45,039 43,905 40,792 38,042 38,941 36,183 45,039 36,784  
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                  
Beginning balance, Total CECL Allowance 386,405 383,292 379,284 381,441 371,183 223,499 379,284 223,499  
Allowances (Reversals), net (166) 3,113 4,008 126,613 10,258 147,684      
Total CECL Allowance, writeoff (6,200)     (127,512)          
Ending balance, Total CECL Allowance $ 380,039 $ 386,405 $ 383,292 $ 380,542 $ 381,441 $ 371,183 $ 380,039 $ 379,284  
General CECL allowance, % of amortized cost 0.55% 0.51% 0.54% 0.49% 0.47% 0.44% 0.55% 0.52% 0.38%
Total CECL allowance, % of amortized cost 4.38% 4.29% 4.75% 4.64% 4.40% 4.29% 4.38% 5.07% 2.61%
Commercial Mortgage and Subordinated Portfolio Segment                  
Allowance and Provision for Loan Credit Loss [Abstract]                  
Beginning balance, Specific CECL Allowance $ 342,500 $ 342,500 $ 342,500 $ 342,500 $ 335,000 $ 193,000 $ 342,500 $ 193,000  
Allowances (Reversals), net (1,300) 0 0   7,500 142,000      
Write-offs, specific CECL allowance, funded (6,200)     $ (127,512)          
Ending balance, Specific CECL Allowance $ 335,000 $ 342,500 $ 342,500   $ 342,500 $ 335,000 $ 335,000 $ 342,500