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Commercial Mortgage Loans, Held for Investment - Schedule of Loans Receivable by Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross carrying value of loans $ 22,800,000 $ 21,600,000  
Less: Allowance for credit losses [1] 71,932 38,302  
Total commercial mortgage loans, held for investment, net [1] 3,967,590 4,383,134  
Commercial Mortgage Receivable, Held-For-Investment      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross carrying value of loans 4,039,522 4,421,436  
Less: Allowance for credit losses 71,932 38,302 $ 78,083
Total commercial mortgage loans, held for investment, net 3,967,590 4,383,134  
Commercial Mortgage Receivable, Held-For-Investment | General allowance for credit losses      
Financing Receivable, Credit Quality Indicator [Line Items]      
Less: Allowance for credit losses 35,648 34,196  
Commercial Mortgage Receivable, Held-For-Investment | Specific allowance for credit losses      
Financing Receivable, Credit Quality Indicator [Line Items]      
Less: Allowance for credit losses 36,284 4,106  
Senior loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross carrying value of loans 3,987,687 4,376,873  
Mezzanine loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total gross carrying value of loans $ 51,835 $ 44,563  
[1] Includes pledged assets of $364.1 million and $329.2 million as of September 30, 2026 and December 31, 2025, respectively.