Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Liability for Claims and Claim Adjustment Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Short-duration Insurance Contracts, Historical Claims Duration
Reserve for losses and loss adjustment expense net of reinsurance	$ 45,419	$ 34,470	$ 3,869	$ 4,165
Reinsurance recoverable on unpaid losses and loss adjustment expenses	127,947	94,566	12,952
Reserve for losses and loss adjustment expenses	173,366	$ 129,036	$ 16,821
Homeowners' Insurance
Short-duration Insurance Contracts, Historical Claims Duration
Reserve for losses and loss adjustment expense net of reinsurance	6,225
Reinsurance recoverable on unpaid losses and loss adjustment expenses	17,214
Special Property
Short-duration Insurance Contracts, Historical Claims Duration
Reserve for losses and loss adjustment expense net of reinsurance	20,480
Reinsurance recoverable on unpaid losses and loss adjustment expenses	108,906
Reinsurance- Nonproportional assumed property
Short-duration Insurance Contracts, Historical Claims Duration
Reserve for losses and loss adjustment expense net of reinsurance	9,542
Other
Short-duration Insurance Contracts, Historical Claims Duration
Reserve for losses and loss adjustment expense net of reinsurance	9,172
Reinsurance recoverable on unpaid losses and loss adjustment expenses	$ 1,827