Concentration of Operations - Net Premiums Earned for the Top Ten States (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 267,125	$ 271,698	$ 275,993
Premium earned percentage	100.00%	100.00%	100.00%
Florida [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 33,838	$ 31,955	$ 31,514
Premium earned percentage	12.70%	11.80%	11.40%
Georgia [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 30,504	$ 30,831	$ 34,772
Premium earned percentage	11.40%	11.30%	12.60%
Louisiana [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 21,150	$ 21,804	$ 20,476
Premium earned percentage	7.90%	8.00%	7.40%
Pennsylvania [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 19,963	$ 21,017	$ 19,574
Premium earned percentage	7.50%	7.70%	7.10%
North Carolina [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 16,432	$ 17,883	$ 15,964
Premium earned percentage	6.20%	6.60%	5.80%
Illinois [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 13,072	$ 12,209	$ 13,680
Premium earned percentage	4.90%	4.50%	5.00%
Wisconsin [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 11,724	$ 12,007	$ 13,108
Premium earned percentage	4.40%	4.40%	4.70%
Virginia [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 10,400	$ 11,537	$ 12,579
Premium earned percentage	3.80%	4.30%	4.60%
South Carolina [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 9,050	$ 9,808	$ 9,186
Premium earned percentage	3.40%	3.60%	3.30%
Minnesota [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 8,845	$ 9,827	$ 10,612
Premium earned percentage	3.30%	3.60%	3.80%
All Others [Member]
Schedule Of Premiums Earned Net By Segment [Line Items]
Net premiums earned	$ 92,147	$ 92,820	$ 94,528
Premium earned percentage	34.50%	34.20%	34.30%