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Investments - Summary of Municipal Debt Securities and Corporate Debt Securities (Details)	Jun. 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	83.00%	81.40%
Municipal debt securities | General obligation bonds
Investments available for sale
Percentage of debt securities	17.00%	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	40.70%	42.00%
Corporate debt securities: | Consumer, non-cyclical
Investments available for sale
Percentage of debt securities	16.50%	15.90%
Corporate debt securities: | Industrial
Investments available for sale
Percentage of debt securities	7.70%	8.10%
Corporate debt securities: | Consumer, cyclical
Investments available for sale
Percentage of debt securities	7.50%	7.10%
Corporate debt securities: | Communications
Investments available for sale
Percentage of debt securities	7.30%	7.20%
Corporate debt securities: | Utilities
Investments available for sale
Percentage of debt securities	6.20%	6.30%
Corporate debt securities: | Technology
Investments available for sale
Percentage of debt securities	6.50%	6.20%
Corporate debt securities: | Energy
Investments available for sale
Percentage of debt securities	5.00%	4.70%
Corporate debt securities: | Basic Materials
Investments available for sale
Percentage of debt securities	2.60%	2.50%

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