Concentration of Operations - Net Premiums Earned for the Top Ten States (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 283,057	$ 270,639	$ 267,125
Premium earned percentage	100.00%	100.00%	100.00%
Florida [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 44,113	$ 38,976	$ 33,838
Premium earned percentage	15.60%	14.40%	12.70%
Georgia [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 27,345	$ 28,267	$ 30,504
Premium earned percentage	9.70%	10.40%	11.40%
Pennsylvania [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 20,272	$ 19,564	$ 19,963
Premium earned percentage	7.20%	7.20%	7.50%
Louisiana [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 17,218	$ 16,998	$ 21,150
Premium earned percentage	6.10%	6.30%	7.90%
Illinois [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 20,830	$ 16,294	$ 13,072
Premium earned percentage	7.40%	6.00%	4.90%
North Carolina [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 18,138	$ 15,863	$ 16,432
Premium earned percentage	6.40%	5.90%	6.20%
Alaska [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 9,994	$ 8,531	$ 8,178
Premium earned percentage	3.40%	3.20%	3.10%
Wisconsin [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 10,996	$ 10,769	$ 11,724
Premium earned percentage	3.90%	4.00%	4.40%
Virginia [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 10,507	$ 10,151	$ 10,400
Premium earned percentage	3.70%	3.80%	3.80%
Minnesota [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 8,869	$ 8,323	$ 8,845
Premium earned percentage	3.10%	3.10%	3.30%
All Others [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 94,775	$ 96,903	$ 93,019
Premium earned percentage	33.50%	35.70%	34.80%