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Investments - Summary of Municipal Debt Securities and Corporate Debt Securities (Details) | Sep. 30, 2023 | Dec. 31, 2022
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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 | 81.10% | 79.00%
Municipal debt securities | General obligation bonds |  |
Investments available for sale |  |
Percentage of debt securities | 18.90% | 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 | 43.10% | 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 | 6.70% | 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 | 6.70% | 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 | 5.50% | 4.90%
Corporate debt securities | Energy |  |
Investments available for sale |  |
Percentage of debt securities | 5.20% | 6.40%
Corporate debt securities | Basic Materials |  |
Investments available for sale |  |
Percentage of debt securities | 2.20% | 2.10%
Corporate debt securities | Government |  |
Investments available for sale |  |
Percentage of debt securities | 0.00% | 0.10%

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