Reinsurance - Effects of Reinsurance and Assumption Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Written premiums:
Direct	$ 20,719	$ 22,533	$ 41,619	$ 44,133
Assumed	6,262	7,192	11,836	10,985
Ceded	(3,899)	(3,549)	(8,048)	(6,892)
Net written premiums	23,082	26,176	45,407	48,226
Earned premiums:
Direct	21,960	22,574	44,020	44,815
Assumed	6,378	2,684	12,582	3,989
Ceded	(3,841)	(3,583)	(7,965)	(7,020)
Net earned premiums	24,497	21,675	48,637	41,784
Losses and LAE:
Direct	16,194	13,905	32,227	27,844
Assumed	4,830	1,447	8,704	2,356
Ceded	(4,350)	(1,811)	(8,524)	(3,960)
Total net incurred losses and LAE	$ 16,674	$ 13,541	$ 32,407	$ 26,240