Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	$ (2,416)	$ (961)
Other Comprehensive Income (Loss), Tax	569	225
Other Comprehensive Income (Loss), Net of Tax	(1,847)	(736)
Unrealized net holding gains (losses) on available for sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(2,085)	(571)
Other Comprehensive Income (Loss), Tax	498	137
Other Comprehensive Income (Loss), Net of Tax	(1,587)	(434)
Unrealized impairment (loss) on held to maturity security [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(501)	(501)
Other Comprehensive Income (Loss), Tax	119	119
Other Comprehensive Income (Loss), Net of Tax	(382)	(382)
Gains on unfunded pension liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	170	111
Other Comprehensive Income (Loss), Tax	(48)	(31)
Other Comprehensive Income (Loss), Net of Tax	$ 122	$ 80