Unpaid Losses and Loss Adjustment Expenses - Changes in the Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves - beginning of period	$ 111,270	$ 107,246
Less: reinsurance recoverables on unpaid losses	(24,218)	(22,579)
Net reserves - beginning of period	87,052	84,667
Add: incurred losses and LAE, net of reinsurance:
Current period	13,584	10,520
Prior period	5,778	3,749
Total net incurred losses and LAE	19,362	14,269
Deduct: loss and LAE payments, net of reinsurance:
Current period	3,180	874
Prior period	11,117	10,427
Total net loss and LAE payments	14,297	11,301
Net reserves - end of period	92,117	87,635
Plus: reinsurance recoverables on unpaid losses	26,559	22,022
Gross reserves - end of period	$ 118,676	$ 109,657