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Investments - Summary of Municipal Debt Securities and Corporate Debt Securities (Details) | Mar. 31, 2024 | Dec. 31, 2023
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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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