v3.26.3
Investments - Schedule of Municipal Debt Securities and Corporate Debt Securities (Details)
Sep. 30, 2026
Dec. 31, 2025
Municipal debt securities    
Investments available for sale    
Percentage of debt securities 100.00% 100.00%
Municipal debt securities | Special revenue bonds    
Investments available for sale    
Percentage of debt securities 81.70% 81.20%
Municipal debt securities | General obligation bonds    
Investments available for sale    
Percentage of debt securities 18.30% 18.80%
Corporate debt securities:    
Investments available for sale    
Percentage of debt securities 100.00% 100.00%
Corporate debt securities: | Financial    
Investments available for sale    
Percentage of debt securities 40.20% 40.90%
Corporate debt securities: | Consumer, non-cyclical    
Investments available for sale    
Percentage of debt securities 18.60% 18.10%
Corporate debt securities: | Industrial    
Investments available for sale    
Percentage of debt securities 10.00% 9.00%
Corporate debt securities: | Utilities    
Investments available for sale    
Percentage of debt securities 8.70% 7.90%
Corporate debt securities: | Consumer, cyclical    
Investments available for sale    
Percentage of debt securities 4.80% 6.00%
Corporate debt securities: | Technology    
Investments available for sale    
Percentage of debt securities 5.90% 6.10%
Corporate debt securities: | Energy    
Investments available for sale    
Percentage of debt securities 4.70% 4.70%
Corporate debt securities: | Communications    
Investments available for sale    
Percentage of debt securities 4.40% 4.70%
Corporate debt securities: | Basic Materials    
Investments available for sale    
Percentage of debt securities 2.70% 2.60%