Accumulated Other Comprehensive Income (Amounts reclassified out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized investment gains	$ 75	$ 287	$ 312	$ 536
Tax (expense) or benefit	225	(367)	1,358	(1,129)
Net Income (Loss)	$ (557)	$ 930	(1,872)	3,167	$ 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			310	338
Total before tax			310	338
Tax (expense) or benefit			(105)	(115)
Net Income (Loss)			$ 205	$ 223