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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, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Sep. 30, 2024
Dec. 31, 2023
Allowance and Provision for Loan Credit Loss [Abstract]                    
Beginning balance, specific CECL allowance, funded     $ 26,482           $ 26,482  
Write-offs, specific CECL allowance, funded                 0 $ (81,890)
Ending balance, specific CECL allowance, funded $ 34,192               34,192 26,482
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]                    
Beginning balance, General CECL allowance, funded 35,319 $ 32,558 26,482 $ 32,276 $ 30,267 $ 26,224     26,482 26,224
Allowances (Reversals), net (1,127) 2,761 6,076 (4,971) 2,009 4,043        
Quarter writeoff, General CECL allowance, funded 0       0          
Ending balance, General CECL allowance, funded 34,192 35,319 32,558 27,305 32,276 30,267 $ 26,224   34,192 26,482
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]                    
Beginning balance, General CECL allowance, unfunded 3,622 3,625 4,017 4,834 4,695 4,347     4,017 4,347
Allowances (Reversals), net 228 (3) (392) (862) 139 348        
Quarter writeoff, General CECL allowance, unfunded 0       0          
Ending balance, General CECL allowance, unfunded 3,850 3,622 3,625 3,972 4,834 4,695 4,347   3,850 4,017
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                    
General CECL Allowance 38,941 36,183 30,499 37,110 34,962 30,571     30,499 30,571
Allowances (Reversals), net (899) 2,758 5,684 (5,833) 2,148 4,391        
General CECL Allowance 38,042 38,941 36,183 31,277 37,110 34,962 30,571   38,042 30,499
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                    
Total CECL Allowance 381,441 371,183 223,499 230,110 168,462 164,071     223,499 164,071
Allowances (Reversals), net 126,613 10,258 147,684 (5,833) 143,628 4,391        
Total CECL Allowance, writeoff (127,512)       (81,980)          
Total CECL Allowance $ 380,542 $ 381,441 $ 371,183 $ 224,277 $ 230,110 $ 168,462 $ 164,071   $ 380,542 $ 223,499
General CECL allowance, % of amortized cost 0.49% 0.47% 0.44% 0.40% 0.46% 0.42% 0.36%   0.49% 0.38%
Total CECL allowance, % of amortized cost 4.64% 4.40% 4.29% 2.74% 2.70% 1.95% 1.86%   4.64% 2.61%
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 $ 342,500 $ 335,000 $ 193,000 $ 193,000 $ 133,500 $ 133,500     $ 193,000 $ 133,500
Allowances (Reversals), net 127,512 7,500 142,000 0 141,480 0        
Write-offs, specific CECL allowance, funded (127,512)       (81,980)          
Ending balance, specific CECL allowance, funded 342,500 $ 342,500 $ 335,000 $ 193,000 193,000 $ 133,500 $ 133,500   $ 342,500 $ 193,000
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                    
General CECL Allowance writeoff $ 0       $ 0