Reinsurance - Narrative (Details) - USD ($)	12 Months Ended			24 Months Ended	36 Months Ended	62 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2019
Effects Of Reinsurance [Line Items]
Prepaid reinsurance premiums	$ 8,301,000	$ 1,316,000		$ 8,301,000	$ 8,301,000
Assumed premiums written	34,294,000	28,905,000	$ 33,459,000
Ceded premium written	30,666,000	18,395,000	14,129,000
Ceded premiums earned	24,248,000	17,511,000	14,114,000
Winter Storm Uri
Effects Of Reinsurance [Line Items]
Ceded premium written	340,000
Ceded premiums earned	340,000
Hurricane
Effects Of Reinsurance [Line Items]
Ceded premium written	86,000	195,000	495,000
Ceded premiums earned	$ 86,000	195,000	495,000
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	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
Effects Of Reinsurance [Line Items]
Percentage of ceding commission	40.00%
Prepaid reinsurance premiums	$ 1,800,000			1,800,000	1,800,000
Liability Risk | Maximum
Effects Of Reinsurance [Line Items]
Amount retained (excess of)	400,000	400,000	400,000
Workers Compensation and Casualty Clash
Effects Of Reinsurance [Line Items]
Amount retained (excess of)					1,000,000.0
Amount reinsured					19,000,000.0
Casualty Clash
Effects Of Reinsurance [Line Items]
Amount retained (excess of)	$ 20,000,000.0
Reinsurance retention policy, reinsured percentage	87.00%
Amount reinsured	$ 10,000,000.0
Liability Reinsurance Policy
Effects Of Reinsurance [Line Items]
Amount retained (excess of)					400,000
Amount reinsured					600,000
Property Reinsurance Policy | Homeowners Lines
Effects Of Reinsurance [Line Items]
Amount reinsured				1,700,000		$ 2,700,000
Property Reinsurance Policy | Commercial Lines
Effects Of Reinsurance [Line Items]
Amount retained (excess of)	200,000	300,000	300,000
Amount reinsured	7,800,000	7,700,000	3,700,000
Property Reinsurance Policy | Property, Liability and Casualty Insurance Product Line
Effects Of Reinsurance [Line Items]
Amount retained (excess of)	2,000,000.0	2,000,000.0	2,000,000.0
Insured property value	$ 28,000,000.0	$ 28,000,000.0	$ 28,000,000.0
Termination date	Jun. 01, 2022	Jun. 01, 2021	Jun. 01, 2020
Property Reinsurance Policy | Maximum | Homeowners Lines
Effects Of Reinsurance [Line Items]
Amount retained (excess of)				$ 300,000		$ 300,000
Multiple Line Reinsurance Policy | Commercial Lines
Effects Of Reinsurance [Line Items]
Amount retained (excess of)					400,000
Amount reinsured					$ 600,000
Quota Share Reinsurance Agreement | Minimum | Commercial Lines
Effects Of Reinsurance [Line Items]
Reinsurance retention policy, reinsured percentage	90.00%
Quota Share Reinsurance Agreement | Maximum | Commercial Lines
Effects Of Reinsurance [Line Items]
Reinsurance retention policy, reinsured percentage	100.00%
Quota Share Reinsurance Agreement, Other Arrangements | Maximum | Other insurance product line
Effects Of Reinsurance [Line Items]
Reinsurance retention policy, reinsured percentage	100.00%
Insurance Fronting Arrangement
Effects Of Reinsurance [Line Items]
Assumed premiums written	$ 34,300,000	$ 28,900,000	$ 33,500,000