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Investments - Summary of Municipal Debt Securities and Corporate Debt Securities (Details) | Sep. 30, 2022 | Dec. 31, 2021
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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 | 78.50% | 77.10%
Municipal debt securities | General obligation bonds |  |
Investments available for sale |  |
Percentage of debt securities | 21.50% | 20.50%
Municipal debt securities | Certificate of participation bonds |  |
Investments available for sale |  |
Percentage of debt securities | 0.00% | 1.90%
Municipal debt securities | Tax allocation bonds |  |
Investments available for sale |  |
Percentage of debt securities | 0.00% | 0.50%
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 | 39.40% | 33.70%
Corporate debt securities | Consumer, non-cyclical |  |
Investments available for sale |  |
Percentage of debt securities | 17.50% | 19.80%
Corporate debt securities | Communications |  |
Investments available for sale |  |
Percentage of debt securities | 8.80% | 11.40%
Corporate debt securities | Industrial |  |
Investments available for sale |  |
Percentage of debt securities | 6.80% | 7.00%
Corporate debt securities | Consumer, cyclical |  |
Investments available for sale |  |
Percentage of debt securities | 7.20% | 7.00%
Corporate debt securities | Energy |  |
Investments available for sale |  |
Percentage of debt securities | 6.60% | 6.00%
Corporate debt securities | Technology |  |
Investments available for sale |  |
Percentage of debt securities | 5.60% | 6.80%
Corporate debt securities | Utilities |  |
Investments available for sale |  |
Percentage of debt securities | 6.10% | 4.60%
Corporate debt securities | Basic materials |  |
Investments available for sale |  |
Percentage of debt securities | 2.00% | 3.70%

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