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Investments - Schedule of Municipal Debt Securities and Corporate Debt Securities (Details)	Sep. 30, 2025	Dec. 31, 2024
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	81.30%	83.30%
Municipal debt securities | General obligation bonds
Investments available for sale
Percentage of debt securities	18.70%	16.70%
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	41.90%	41.80%
Corporate debt securities: | Consumer, non-cyclical
Investments available for sale
Percentage of debt securities	16.50%	15.10%
Corporate debt securities: | Industrial
Investments available for sale
Percentage of debt securities	8.30%	8.20%
Corporate debt securities: | Utilities
Investments available for sale
Percentage of debt securities	8.20%	8.70%
Corporate debt securities: | Technology
Investments available for sale
Percentage of debt securities	6.50%	6.40%
Corporate debt securities: | Consumer, cyclical
Investments available for sale
Percentage of debt securities	6.00%	6.30%
Corporate debt securities: | Communications
Investments available for sale
Percentage of debt securities	5.00%	5.70%
Corporate debt securities: | Energy
Investments available for sale
Percentage of debt securities	4.90%	5.10%
Corporate debt securities: | Basic Materials
Investments available for sale
Percentage of debt securities	2.70%	2.70%

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