Deferred Policy Acquisition Costs - Activity in Deferred Policy Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at beginning of period	$ 12,302	$ 12,021	$ 12,011	$ 12,781
Deferred policy acquisition costs	6,730	6,274	18,820	18,499
Amortization of policy acquisition costs	(6,153)	(6,452)	(17,952)	(19,437)
Net change	577	(178)	868	(938)
Balance at end of period	$ 12,879	$ 11,843	$ 12,879	$ 11,843