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Investments - Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities (Phantom) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investment [Line Items]
Investment expense	$ (93)	$ (84)	$ (177)	$ (276)
Investment income	2,666	3,488	8,090	10,891
Fixed Income Investments [Member]
Investment [Line Items]
Gross Investment Income, Operating	1,192	1,133	4,063	3,567
Short-Term [Member]
Investment [Line Items]
Gross Investment Income, Operating	1,344	2,495	3,991	8,072
Other Investments [Member]
Investment [Line Items]
Gross Investment Income, Operating	$ 199	$ (56)	$ 120	$ (472)

X

- Definition

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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Amount of expenses related to the generation of investment income.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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