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Transactions With Related Parties - Our Manager (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]          
Management fee payable $ 16,849   $ 16,849   $ 18,534
Non-cash compensation expense $ 7,302 $ 7,984 $ 21,570 $ 24,058  
Common stock, shares outstanding (in shares) 170,720,119   170,720,119   172,792,094
Restricted Class A Common Stock          
Related Party Transaction [Line Items]          
Number of shares of restricted class A common stock outstanding (in shares) 1,582,654   1,582,654   2,142,759
Restricted shares, vesting period (in years)     3 years    
Related Party          
Related Party Transaction [Line Items]          
Common stock, shares outstanding (in shares) 12,874,956   12,874,956    
Percentage of stock 7.50%   7.50%    
Subsidiary of Common Parent          
Related Party Transaction [Line Items]          
Common stock, shares outstanding (in shares) 8,234,581   8,234,581    
Percentage of stock 4.80%   4.80%    
Director | Deferred Stock Units          
Related Party Transaction [Line Items]          
Number of shares of restricted class A common stock outstanding (in shares) 331,611   331,611    
BXMT Advisors Limited Liability Company and Affiliates | Related Party          
Related Party Transaction [Line Items]          
Management fee payable $ 16,800   $ 16,800   $ 18,500
Manager | Related Party          
Related Party Transaction [Line Items]          
Renewal term (in years)     1 year    
Management fees paid to manager 17,000 18,700 $ 52,800 64,000  
Expenses $ 449 340 $ 868 1,400  
Manager | Related Party | Restricted Class A Common Stock          
Related Party Transaction [Line Items]          
Number of shares of restricted class A common stock outstanding (in shares) 828,213   828,213    
Aggregate grant fair value     $ 17,100    
Restricted shares, vesting period (in years)     3 years    
Non-cash compensation expense $ 3,600 $ 4,200 $ 10,900 $ 12,600