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Investments - Schedule of Municipal Debt Securities and Corporate Debt Securities (Details)	Dec. 31, 2023	Dec. 31, 2022
Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	100.00%	100.00%
Municipal debt securities | Special revenue bonds
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	81.40%	79.00%
Municipal debt securities | General obligation bonds
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	18.60%	20.90%
Municipal debt securities | Tax allocation bonds
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	0.00%	0.10%
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	100.00%	100.00%
Corporate debt securities | Financial
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	42.00%	40.50%
Corporate debt securities | Consumer, Non-Cyclical
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	15.90%	17.90%
Corporate debt securities | Industrial
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	8.10%	6.80%
Corporate debt securities | Communications
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	7.20%	8.40%
Corporate debt securities | Consumer, Cyclical
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	7.10%	6.80%
Corporate debt securities | Utilities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	6.30%	6.10%
Corporate debt securities | Technology
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	6.20%	4.90%
Corporate debt securities | Energy
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	4.70%	6.40%
Corporate debt securities | Basic Materials
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	2.50%	2.10%
Corporate debt securities | Government
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	0.00%	0.10%

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Percentage of investment owned to net assets.

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