Deferred Policy Acquisition Costs - Activity in Deferred Policy Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at beginning of period	$ 12,153	$ 12,050	$ 12,011	$ 12,781
Deferred policy acquisition costs	6,359	6,443	12,090	12,225
Amortization of policy acquisition costs	(6,210)	(6,472)	(11,799)	(12,985)
Net change	149	(29)	291	(760)
Balance at end of period	$ 12,302	$ 12,021	$ 12,302	$ 12,021