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Schedule of Investment Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule Of Available For Sale Securities [Line Items]
Investment income	$ 18,415	$ 16,993	$ 48,908	$ 47,839
Investment expense	(504)	(505)	(1,508)	(1,520)
Net investment income	17,911	16,488	47,400	46,319
Fixed Income Securities
Schedule Of Available For Sale Securities [Line Items]
Investment income	14,972	15,457	44,268	43,617
Equity Securities
Schedule Of Available For Sale Securities [Line Items]
Investment income	716	181	1,001	615
Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Investment income	715	800	2,321	2,121
Other Invested Assets
Schedule Of Available For Sale Securities [Line Items]
Investment income	$ 2,012	$ 555	$ 1,318	$ 1,486

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Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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