Loss and Loss Adjustment Expense Reserves (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Insurance Loss Reserves [Abstract]
Balance, beginning of period, gross of reinsurance	$ 9,583	$ 5,884	$ 6,971	$ 2,123
Less reinsurance recoverable on loss and LAE expense reserves	(6,012)	(3,431)	(3,652)	(120)
Balance, beginning of period, net of reinsurance	3,571	2,453	3,319	2,003
Incurred related to:
Current year	8,717	6,487	15,953	15,090
Prior years	(922)	(44)	(2,144)	(173)
Paid related to:
Current year	(7,246)	(5,671)	(12,060)	(12,719)
Prior years	411	36	(537)	(940)
Balance, September 30, net of reinsurance	4,531	3,261	4,531	3,261
Plus reinsurance recoverable related to loss and LAE expense reserves	17,560	5,366	17,560	5,366
Balance, September 30, gross of reinsurance	$ 22,091	$ 8,627	$ 22,091	$ 8,627