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Investments - Schedule of Municipal Debt Securities and Corporate Debt Securities (Details)	Dec. 31, 2022	Dec. 31, 2021
Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	100.00%	100.00%
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	100.00%	100.00%
Special revenue bonds | Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	79.00%	77.10%
General obligation bonds | Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	20.90%	20.50%
Certificate of participation bonds | Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	0.00%	1.90%
Tax allocation bonds | Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	0.10%	0.50%
Financial | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	40.50%	33.70%
Consumer, non-cyclical | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	17.90%	19.80%
Communications | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	8.40%	11.40%
Consumer, cyclical | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	6.80%	7.00%
Industrial | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	6.80%	7.00%
Energy | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	6.40%	6.00%
Utilities | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	6.10%	4.60%
Technology | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	4.90%	6.80%
Basic Materials | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	2.10%	3.70%
Government | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Percentage of debt securities	0.10%	0.00%

X

- Definition

Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column D))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

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+ References

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