Deferred Policy Acquisition Costs - Activity in Deferred Policy Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at beginning of period	$ 13,290	$ 12,102
Deferred policy acquisition costs	6,138	6,122
Amortization of policy acquisition costs	(6,472)	(6,003)
Net change	(334)	119
Balance at end of period	$ 12,956	$ 12,221