Reinsurance - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2022
Effects Of Reinsurance [Line Items]
Ceded premium written		$ 3,912,000	$ 32,859,000	$ 18,558,000	$ 66,077,000
Ceded premiums earned		8,677,000	14,171,000	38,737,000	39,343,000
Reinsurance recoverables on paid losses		12,919,000		12,919,000		$ 12,619,000
Stated net reserves retained	$ 92,448,000	95,045,000	92,448,000	95,045,000	92,448,000	103,805,000	$ 100,428,000	$ 88,499,000	$ 82,888,000
Losses and loss adjustment expenses, net		15,152,000	20,911,000	40,953,000	53,943,000
Prior period		7,868,000	3,630,000	10,206,000	2,939,000
Reinsurance recoverables on unpaid losses	46,766,000	65,860,000	$ 46,766,000	65,860,000	46,766,000	70,807,000	$ 74,358,000	$ 56,505,000	$ 82,651,000
Loss Portfolio Transfer (“LPT”) Reinsurance Agreement
Effects Of Reinsurance [Line Items]
Reinsurance recoverables on paid losses		6,100,000		6,100,000		3,800,000
Reinsurance recoverables on unpaid losses		$ 6,000,000		6,000,000		10,900,000
100% Quota Share Reinsurance Agreement
Effects Of Reinsurance [Line Items]
Ceded premium written	$ 30,900,000
100% Quota Share Reinsurance Agreement | Maximum
Effects Of Reinsurance [Line Items]
Percentage of commission ceded, net	27.00%
100% Quota Share Reinsurance Agreement | Minimum
Effects Of Reinsurance [Line Items]
Percentage of commission ceded, net	22.00%
100% Cede of Commercial Liability Risks In Excess of $400,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)				400,000	400,000
Corridor | Loss Portfolio Transfer (“LPT”) Reinsurance Agreement
Effects Of Reinsurance [Line Items]
Losses and loss adjustment expenses, net				5,500,000		5,500,000
Layer | Loss Portfolio Transfer (“LPT”) Reinsurance Agreement | Maximum
Effects Of Reinsurance [Line Items]
Losses and loss adjustment expenses, net				20,000,000		20,000,000
Layer | Loss Portfolio Transfer (“LPT”) Reinsurance Agreement | Minimum
Effects Of Reinsurance [Line Items]
Losses and loss adjustment expenses, net				12,200,000		$ 9,100,000
Ceded Commercial Property Risks In Excess of $200,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)				400,000	400,000
Ceded Homeowners Specific Risks In Excess of $300,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)				$ 400,000	$ 300,000