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Investments - Summary of Municipal Debt Securities and Corporate Debt Securities (Details)	Jun. 30, 2023	Dec. 31, 2022
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	81.20%	79.00%
Municipal debt securities | General obligation bonds
Investments available for sale
Percentage of debt securities	18.80%	20.90%
Municipal debt securities | Tax allocation bonds
Investments available for sale
Percentage of debt securities	0.00%	0.10%
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	43.70%	40.50%
Corporate debt securities | Consumer, non-cyclical
Investments available for sale
Percentage of debt securities	15.80%	17.90%
Corporate debt securities | Consumer, cyclical
Investments available for sale
Percentage of debt securities	6.50%	6.80%
Corporate debt securities | Industrial
Investments available for sale
Percentage of debt securities	7.80%	6.80%
Corporate debt securities | Utilities
Investments available for sale
Percentage of debt securities	6.50%	6.10%
Corporate debt securities | Communications
Investments available for sale
Percentage of debt securities	7.00%	8.40%
Corporate debt securities | Technology
Investments available for sale
Percentage of debt securities	5.40%	4.90%
Corporate debt securities | Energy
Investments available for sale
Percentage of debt securities	5.00%	6.40%
Corporate debt securities | Basic Materials
Investments available for sale
Percentage of debt securities	2.30%	2.10%
Corporate debt securities | Government
Investments available for sale
Percentage of debt securities	0.00%	0.10%

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