v3.26.3
Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Details)
$ in Thousands
Sep. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value $ 2,847,109 $ 1,758,070
Trading investments 41,308 49,250
Total 2,888,418 1,807,320
Level 3     
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 1,264 1,892
Trading investments 41,308 49,250
Total 42,572 $ 51,142
Level 3  | Valuation Technique, Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated Fair Value 1,264  
Trading investments 41,308  
Total $ 42,572  
Level 3  | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities 0.070  
Residual Interests 0.070  
Level 3  | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Default Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities 0.029  
Residual Interests 0.029  
Level 3  | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities 0.109  
Residual Interests 0.109  
Level 3  | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Default Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities 0.179  
Residual Interests 0.179  
Level 3  | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities 0.083  
Residual Interests 0.083  
Level 3  | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Default Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities 0.103  
Residual Interests 0.103