Unpaid Losses and Loss Adjustment Expenses - Reconciliation of Loss to the Liability for Claims (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Unpaid losses and ALAE, net of reinsurance	$ 80,050
Reinsurance recoverables on unpaid losses	22,579	$ 29,685	$ 20,066	$ 6,658
Unpaid ULAE	4,617
Total gross unpaid losses and LAE	107,246	$ 92,807	$ 87,896	$ 54,651
Commercial Lines
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Unpaid losses and ALAE, net of reinsurance	77,316
Reinsurance recoverables on unpaid losses	20,051
Personal Lines
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Unpaid losses and ALAE, net of reinsurance	2,734
Reinsurance recoverables on unpaid losses	$ 2,528