Reinsurance - Effects of Reinsurance and Assumption Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Written premiums:
Direct	$ 18,464	$ 18,855
Assumed	5,752	4,882
Ceded	(3,894)	(3,892)
Net written premiums	20,322	19,845
Earned premiums:
Direct	18,004	21,224
Assumed	7,546	6,500
Ceded	(3,863)	(3,924)
Net earned premiums	21,687	23,800
Losses and LAE:
Direct	16,799	12,958
Assumed	4,513	3,554
Ceded	(6,856)	(3,184)
Total net incurred losses and LAE	$ 14,456	$ 13,328