Reinsurance - Effects of Reinsurance and Assumption Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Written premiums:
Direct	$ 17,568	$ 20,719	$ 36,423	$ 41,619
Assumed	8,994	6,262	13,876	11,836
Ceded	(3,967)	(3,899)	(7,860)	(8,048)
Net written premiums	22,595	23,082	42,439	45,407
Earned premiums:
Direct	20,561	21,960	41,785	44,020
Assumed	7,295	6,378	13,796	12,582
Ceded	(3,918)	(3,841)	(7,842)	(7,965)
Net earned premiums	23,938	24,497	47,739	48,637
Losses and LAE:
Direct	14,432	16,194	27,390	32,227
Assumed	3,414	4,830	6,969	8,704
Ceded	(2,779)	(4,350)	(5,963)	(8,524)
Total net incurred losses and LAE	$ 15,067	$ 16,674	$ 28,396	$ 32,407