Reinsurance - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) program
Reinsurance [Line Items]
Number of additional assumed programs | program			2
Number of programs not renewed | program			1
Casualty Excess and Property Excess | Maximum
Reinsurance [Line Items]
Reinsurance recoverables		$ 22,500
Property and casualty business
Reinsurance [Line Items]
Reinsurance recoverables	$ 15,016	$ 28,887
Property and casualty business | Casualty Excess and Property Excess
Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk, percentage	7.02%	637.00%	6.66%
Property and casualty business | Casualty Excess and Property Excess | Minimum
Reinsurance [Line Items]
Retention amount	$ 58,500	$ 58,500	$ 58,500
Property and casualty business | Casualty Excess and Property Excess | Maximum
Reinsurance [Line Items]
Reinsurance recoverables	30,000	30,000	30,000
Retention amount	$ 71,500	$ 71,500	$ 71,500
Percent of program placed	65.00%	75.00%