Unpaid Losses and Loss Adjustment Expenses - Changes in the Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves - beginning of period	$ 109,657	$ 93,966	$ 107,246	$ 92,807
Less: reinsurance recoverables on unpaid losses	(22,022)	(24,551)	(22,579)	(29,685)
Plus: deferred gain on ADC		3,394		5,677
Net reserves - beginning of period	87,635	72,809	84,667	68,799
Add: incurred losses and LAE, net of reinsurance:
Current period	8,908	11,994	19,428	24,465
Prior period	3,037	2,388	6,786	4,373
Total net incurred losses and LAE	11,945	14,382	26,214	28,838
Deduct: loss and LAE payments, net of reinsurance:
Current period	3,044	2,692	3,918	3,742
Prior period	10,694	7,433	21,121	16,829
Total net loss and LAE payments	13,738	10,125	25,039	20,571
Net reserves - end of period	85,842	77,066	85,842	77,066
Plus: reinsurance recoverables on unpaid losses	20,892	21,396	20,892	21,396
Less: deferred gain on ADC		(481)		(481)
Gross reserves - end of period	$ 106,734	$ 97,981	$ 106,734	$ 97,981