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Equity Securities - Equity Securities by Market Sector Distribution (Details) - Equity securities - Industry sector	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Percentage		100.00%	100.00%
Consumer goods
Debt and Equity Securities, FV-NI [Line Items]
Percentage		8.00%	5.00%
Education
Debt and Equity Securities, FV-NI [Line Items]
Percentage		21.00%	20.00%
Energy and utilities
Debt and Equity Securities, FV-NI [Line Items]
Percentage		38.00%	10.00%
Finance
Debt and Equity Securities, FV-NI [Line Items]
Percentage		4.00%	48.00%
Healthcare
Debt and Equity Securities, FV-NI [Line Items]
Percentage		3.00%	2.00%
Industrials
Debt and Equity Securities, FV-NI [Line Items]
Percentage		19.00%	12.00%
Information technology
Debt and Equity Securities, FV-NI [Line Items]
Percentage	0.00%	1.00%
Other
Debt and Equity Securities, FV-NI [Line Items]
Percentage		6.00%	3.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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