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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
May 24, 2021
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance and Provision for Loan Credit Loss [Abstract]                        
Beginning balance, specific CECL allowance, funded       $ 133,500           $ 133,500    
Write-offs, specific CECL allowance, funded                   (81,890) $ (7,000)  
Ending balance, specific CECL allowance, funded   $ 193,000     $ 133,500         193,000 133,500  
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]                        
Beginning balance, General CECL allowance, funded   32,276 $ 30,267 26,224 21,985 $ 23,362 $ 21,377 $ 33,588   26,224 33,588  
Quarter allowances (reversals), General CECL allowance, funded   (4,971) 2,009 4,043   (1,377) 1,985 (12,211)        
Quarter writeoff, General CECL allowance, funded     0                  
Ending balance, General CECL allowance, funded   27,305 32,276 30,267 26,224 21,985 23,362 21,377   27,305 26,224 $ 33,588
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]                        
Beginning balance, General CECL allowance, unfunded   4,834 4,695 4,347 2,812 3,999 3,928 3,106   4,347 3,106  
Quarter allowances (reversals), General CECL allowance, unfunded   (862) 139 348   (1,187) 71 822        
Quarter writeoff, General CECL allowance, unfunded     0                  
Ending balance, General CECL allowance, unfunded   3,972 4,834 4,695 4,347 2,812 3,999 3,928   3,972 4,347 3,106
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                        
General CECL Allowance   37,110 34,962 30,571 24,797 27,361 25,305 36,694   30,571 36,694  
General CECL Allowance   31,277 37,110 34,962 30,571 24,797 27,361 25,305   31,277 30,571 36,694
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                        
Total CECL Allowance   230,110 168,462 164,071 143,797 199,361 200,305 181,694   164,071 181,694  
Total CECL Allowance, Quarter allowances (reversals)   (5,833) 143,628 4,391   (55,564) (944) 18,611        
Total CECL Allowance, writeoff     (81,980)                  
Total CECL Allowance   $ 224,277 $ 230,110 $ 168,462 $ 164,071 $ 143,797 $ 199,361 $ 200,305   $ 224,277 $ 164,071 $ 181,694
General CECL allowance, % of amortized cost   0.40% 0.46% 0.42% 0.36% 0.30% 0.33% 0.32%   0.40% 0.36% 0.49%
Total CECL allowance, % of amortized cost   2.74% 2.70% 1.95% 1.86% 1.62% 2.18% 2.34%   2.74% 1.86% 2.26%
General CECL (allowance) reversal     $ 2,100 $ 4,400                
Increase in Specific CECL Allowance, net $ 10,000           $ (10,000)   $ 20,000      
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   $ 193,000 133,500 133,500 119,000 $ 172,000 175,000 $ 145,000   $ 133,500 $ 145,000  
Increase in current expected credit loss allowance, net   0 141,480 0   (53,000) (3,000) 30,000        
Write-offs, specific CECL allowance, funded     (81,980)                  
Ending balance, specific CECL allowance, funded   193,000 193,000 133,500 $ 133,500 119,000 172,000 175,000   193,000 $ 133,500 $ 145,000
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                        
Total quarter allowances (reversals), General CECL allowance   $ (5,833) 2,148 $ 4,391   (2,564) 2,056 (11,389)        
General CECL Allowance writeoff     $ 0                  
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                        
Increase in Specific CECL Allowance, net                   $ 59,500    
Commercial Mortgage and Subordinated Portfolio Segment | Residential-for-Sale - Manhattan, NY                        
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                        
Total quarter allowances (reversals), General CECL allowance               11,400        
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                        
Increase in Specific CECL Allowance, net               $ 30,000        
Specific CECL allowance (reversal), net of previously recorded amount             3,000          
Commercial Mortgage and Subordinated Portfolio Segment | Multifamily Development - Brooklyn, NY                        
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                        
Increase in Specific CECL Allowance, net             10,000          
Decrease in general CECL Allowance             2,100          
Commercial Mortgage and Subordinated Portfolio Segment | Hotel - Atlanta, GA                        
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                        
Increase in Specific CECL Allowance, net             $ 7,000          
Commercial Mortgage and Subordinated Portfolio Segment | Urban predevelopment - Miami, FL                        
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]                        
Total quarter allowances (reversals), General CECL allowance           2,600            
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]                        
Increase in Specific CECL Allowance, net           $ 53,000