Schedule VI. Supplemental Information Concerning Property-Casualty Insurance Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]
Deferred Policy Acquisition Costs	$ 21,085	$ 19,151	$ 17,975
Reserves for Unpaid Loss and Loss Adjustment Expense	613,583	651,309	673,994
Unearned Premium	135,503	121,926	116,585
Net Premiums Earned	283,057	270,639	267,125
Net Investment Income	26,993	29,212	31,339
Loss and LAE Related to Current Period	203,802	192,153	189,659
Loss and LAE Related to Prior Periods	(33,865)	(34,886)	(41,396)
Amortization of Deferred Policy Acquisition Costs	(44,224)	(42,172)	(40,859)
Paid Claims and Claim Adjustment Expenses	200,996	172,948	177,497
Net Premiums Written	$ 296,634	$ 275,980	$ 268,734