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Related Party Transactions - Additional Information (Details)
$ in Thousands, € in Millions, £ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
Loan
Dec. 31, 2023
USD ($)
Loan
Dec. 31, 2022
USD ($)
Sep. 30, 2024
Dec. 31, 2023
GBP (£)
Loan
Dec. 31, 2023
EUR (€)
Loan
Feb. 28, 2023
USD ($)
Dec. 31, 2022
GBP (£)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Related Party Transaction [Line Items]                    
Termination fee, percent fee of base management fee 3                  
Mortgage loans on real estate, commercial and consumer, net $ 7,104,156 [1] $ 8,358,093                
Outstanding amount $ 462,900 $ 669,300                
Joint venture | Eight Hospitals in Massachusetts                    
Related Party Transaction [Line Items]                    
Equity method investment, ownership percentage       41.20%            
Atlas Facility                    
Related Party Transaction [Line Items]                    
Number of loans | Loan 5 4     4 4        
Secured Debt | Credit Suisse Facility | Line of Credit                    
Related Party Transaction [Line Items]                    
Outstanding amount             $ 632,300      
Commercial Mortgage and Subordinated Portfolio Segment                    
Related Party Transaction [Line Items]                    
Number of commercial mortgage loans | Loan   3                
Mortgage loans on real estate, commercial and consumer, net $ 8,300 $ 95,500                
Mixed Use Property - London | Commercial Mortgage and Subordinated Portfolio Segment                    
Related Party Transaction [Line Items]                    
Mortgage loans on real estate, commercial and consumer, net     $ 327,700   £ 15.0     £ 293.4    
Various Properties In Europe | Commercial Mortgage and Subordinated Portfolio Segment                    
Related Party Transaction [Line Items]                    
Mortgage loans on real estate, commercial and consumer, net   219,000       € 205.7        
Mortgage loans on real estate, commercial and consumer, funded, net   122,400       € 115.0        
Arrangement fees                    
Related Party Transaction [Line Items]                    
Incentive Fee Payable                 $ 400 $ 200
Limited Liability Company                    
Related Party Transaction [Line Items]                    
Rate of management fees 1.50%                  
Extension period 1 year                  
Period of termination 180 days                  
Termination fee calculation period 24 months                  
Limited Liability Company | Management Agreement                    
Related Party Transaction [Line Items]                    
Payable to related party $ 8,700 9,600                
Affiliated Entity                    
Related Party Transaction [Line Items]                    
Debt instrument, face amount                   $ 30,000
Affiliated Entity | Management Agreement                    
Related Party Transaction [Line Items]                    
Management fees to related party 36,100 38,000 38,400              
Professional and Contract Services Expense $ 7,800 $ 6,400 $ 5,500              
[1] Excludes Note receivable, held for sale with an outstanding principal and carrying value of $41.2 million.