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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Investment Income [Line Items]
Total investment income	$ 14,108	$ 11,267
Less: Investment expenses	(585)	(569)
Net investment income	13,523	10,698
Available-for-sale debt securities
Net Investment Income [Line Items]
Investment income	7,214	5,870
Equity securities
Net Investment Income [Line Items]
Investment income	894	1,053
Cash and cash equivalents
Net Investment Income [Line Items]
Investment income	5,823	4,203
Other
Net Investment Income [Line Items]
Investment income	$ 177	$ 141

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- 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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