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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 6 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 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    
Write-offs, specific CECL allowance, funded         0 $ (127,512)  
Ending balance, Specific CECL Allowance $ 38,848       38,848 30,836  
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]              
Beginning balance, General CECL Allowance, Funded 34,712 30,836 $ 32,558 $ 26,482 30,836 26,482  
Allowances (Reversals), net 4,136 3,876 2,761 6,076      
Ending balance, General CECL Allowance, Funded 38,848 34,712 35,319 32,558 38,848 30,836  
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]              
Beginning balance, General CECL Allowance, Unfunded 6,080 5,948 3,625 4,017 5,948 4,017  
Allowances (Reversals), net (1,023) 132 (3) (392)      
Ending balance, General CECL Allowance, Unfunded 5,057 6,080 3,622 3,625 5,057 5,948  
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]              
Beginning balance, General CECL Allowance 40,792 36,784 36,183 30,499 36,784 30,499  
Allowances (Reversals), net 3,113 4,008 2,758 5,684      
Ending balance,General CECL Allowance 43,905 40,792 38,941 36,183 43,905 36,784  
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]              
Beginning balance, Total CECL Allowance 383,292 379,284 371,183 223,499 379,284 223,499  
Allowances (Reversals), net 3,113 4,008 10,258 147,684      
Ending balance, Total CECL Allowance $ 386,405 $ 383,292 $ 381,441 $ 371,183 $ 386,405 $ 379,284  
General CECL allowance, % of amortized cost 0.51% 0.54% 0.47% 0.44% 0.51% 0.52% 0.38%
Total CECL allowance, % of amortized cost 4.29% 4.75% 4.40% 4.29% 4.29% 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 $ 335,000 $ 193,000 $ 342,500 $ 193,000  
Allowances (Reversals), net 0 0 7,500 142,000      
Ending balance, Specific CECL Allowance $ 342,500 $ 342,500 $ 342,500 $ 335,000 $ 342,500 $ 342,500