Reinsurance - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Effects Of Reinsurance [Line Items]
Ceded premium written	$ 7,635,000	$ 4,798,000	$ 19,974,000	$ 13,311,000
Ceded premiums earned	$ 6,829,000	$ 4,645,000	$ 17,631,000	12,882,000
Minimum
Effects Of Reinsurance [Line Items]
Reinsurance retention policy, reinsured percentage			40.00%
Maximum
Effects Of Reinsurance [Line Items]
Reinsurance retention policy, reinsured percentage			60.00%
Maximum | Homeowners Lines
Effects Of Reinsurance [Line Items]
Amount retained (excess of)			$ 300,000	300,000
Property Risk
Effects Of Reinsurance [Line Items]
Amount retained (excess of)			200,000
Property Risk | Maximum
Effects Of Reinsurance [Line Items]
Amount retained (excess of)			400,000	300,000
Liability Risk | Maximum
Effects Of Reinsurance [Line Items]
Amount retained (excess of)			$ 400,000	$ 400,000