Reinsurance - Effects of Reinsurance and Assumption Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Written premiums:
Direct	$ 20,900	$ 21,600
Assumed	5,574	3,793
Ceded	(4,150)	(3,343)
Net written premiums	22,324	22,050
Earned premiums:
Direct	22,060	22,241
Assumed	6,204	1,305
Ceded	(4,124)	(3,437)
Net earned premiums	24,140	20,109
Losses and LAE:
Direct	16,033	13,939
Assumed	3,875	909
Ceded	(4,175)	(2,149)
Total net incurred losses and LAE	$ 15,733	$ 12,699