Reinsurance - Narrative (Details) - USD ($)		3 Months Ended		12 Months Ended
	Dec. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Effects Of Reinsurance [Line Items]
Ceded premium written		$ 14,943,000	$ 5,890,000
Ceded premiums earned		8,809,000	$ 5,412,000
40% Cede of Commercial Liability Risks In Excess of $400,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)		$ 400,000
Reinsurance retention policy, reinsured percentage		40.00%
60% Cede of Commercial Liability Risks In Excess of $300,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)		$ 300,000
Reinsurance retention policy, reinsured percentage		60.00%
100% Cede of Commercial Liability Risks In Excess of $400,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)				$ 400,000	$ 400,000
Ceded Commercial Property Risks In Excess of $300,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)		$ 300,000
Ceded Commercial Property Risks In Excess of $200,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)				200,000
40% Cede of Commercial Property Risks In Excess of $400,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)					$ 400,000
Reinsurance retention policy, reinsured percentage					40.00%
60% Cede of Commercial Property Risks In Excess of $300,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)					$ 300,000
Reinsurance retention policy, reinsured percentage					60.00%
Ceded Homeowners Specific Risks In Excess of $300,000
Effects Of Reinsurance [Line Items]
Amount retained (excess of)		300,000		$ 300,000
Ceding Commission
Effects Of Reinsurance [Line Items]
Reinsurance retention policy, reinsured percentage	40.00%
Ceding Commission | Acquisition-related Costs
Effects Of Reinsurance [Line Items]
Ceded premium written	$ 0	$ 2,200,000