v3.26.3
Fair Value of Financial Instruments - Schedule of Financial Instruments Not Measured at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Mortgage servicing rights, net $ 201,178 $ 212,216 $ 0
Allowance for credit loss [1] 71,932 38,302  
Carrying Amount      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Allowance for credit loss 71,900 38,300  
Carrying Amount | Level III      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Commercial mortgage loans, held for investment 4,039,522 4,421,436  
Mortgage note payable 24,186 23,998  
Other financings 12,865 12,865  
Unsecured debt 161,392 185,466  
Mortgage servicing rights, net 201,178 212,216  
Carrying Amount | Level I      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Pledged investment securities 24,781 20,483  
Carrying Amount | Level II      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized loan obligations 2,856,873 2,735,582  
Fair Value | Level III      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Commercial mortgage loans, held for investment 4,007,195 4,411,871  
Mortgage note payable 24,186 23,998  
Other financings 12,865 12,865  
Unsecured debt 184,400 178,900  
Mortgage servicing rights, net 252,188 213,572  
Fair Value | Level I      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Pledged investment securities 26,180 21,175  
Fair Value | Level II      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized loan obligations $ 2,881,559 $ 2,757,931  
[1] Includes pledged assets of $364.1 million and $329.2 million as of September 30, 2026 and December 31, 2025, respectively.