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Investments - Summary of Municipal Debt Securities and Corporate Debt Securities (Details)	Sep. 30, 2024	Dec. 31, 2023
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	83.70%	81.40%
Municipal debt securities | General obligation bonds
Investments available for sale
Percentage of debt securities	16.30%	18.60%
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	42.60%	42.00%
Corporate debt securities: | Consumer, non-cyclical
Investments available for sale
Percentage of debt securities	15.60%	15.90%
Corporate debt securities: | Industrial
Investments available for sale
Percentage of debt securities	8.20%	8.10%
Corporate debt securities: | Consumer, cyclical
Investments available for sale
Percentage of debt securities	6.20%	7.10%
Corporate debt securities: | Communications
Investments available for sale
Percentage of debt securities	6.10%	7.20%
Corporate debt securities: | Utilities
Investments available for sale
Percentage of debt securities	7.60%	6.30%
Corporate debt securities: | Technology
Investments available for sale
Percentage of debt securities	6.00%	6.20%
Corporate debt securities: | Energy
Investments available for sale
Percentage of debt securities	4.80%	4.70%
Corporate debt securities: | Basic Materials
Investments available for sale
Percentage of debt securities	2.90%	2.50%

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