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Investments - Summary of Municipal Debt Securities and Corporate Debt Securities (Details)	Mar. 31, 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	81.70%	81.40%
Municipal debt securities | General obligation bonds
Investments available for sale
Percentage of debt securities	18.30%	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	41.80%	42.00%
Corporate debt securities | Consumer, non-cyclical
Investments available for sale
Percentage of debt securities	15.90%	15.90%
Corporate debt securities | Industrial
Investments available for sale
Percentage of debt securities	8.00%	8.10%
Corporate debt securities | Consumer, cyclical
Investments available for sale
Percentage of debt securities	7.20%	7.10%
Corporate debt securities | Communications
Investments available for sale
Percentage of debt securities	7.10%	7.20%
Corporate debt securities | Utilities
Investments available for sale
Percentage of debt securities	6.40%	6.30%
Corporate debt securities | Technology
Investments available for sale
Percentage of debt securities	6.20%	6.20%
Corporate debt securities | Energy
Investments available for sale
Percentage of debt securities	4.90%	4.70%
Corporate debt securities | Basic Materials
Investments available for sale
Percentage of debt securities	2.50%	2.50%

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