Provision for Unpaid Losses and Loss Adjustment Expenses - Provision by Insurance Product (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Total gross reserves for losses and loss adjustment expenses	$ 111,741	$ 74,869	$ 54,988
Auto
Liability for Claims and Claims Adjustment Expense [Line Items]
Total gross reserves for losses and loss adjustment expenses	111,575	74,573
Marine
Liability for Claims and Claims Adjustment Expense [Line Items]
Total gross reserves for losses and loss adjustment expenses	$ 166	$ 296