Accumulated Other Comprehensive Income (Amounts reclassified out of AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized investment gains	$ 234	$ 998
Tax (expense) or benefit	(89)	(1,031)
Net Income (Loss)	(1,203)	3,063
Amounts Reclassified from Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available-for-Sale Securities
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized investment gains	232	832
Total before tax	232	832
Tax (expense) or benefit	(79)	(283)
Net Income (Loss)	$ 153	$ 549