Summary of Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, before-tax amount	$ (3,621)	$ (3,446)
Accumulated other comprehensive loss, tax effect	1,231	1,172
Accumulated other comprehensive loss, net of tax	(2,390)	(2,274)
Net Unrealized loss on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, before-tax amount	(1,772)	(1,646)
Accumulated other comprehensive loss, tax effect	603	560
Accumulated other comprehensive loss, net of tax	(1,169)	(1,086)
Discount on AFS to HTM Reclassification [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, before-tax amount		(8)
Accumulated other comprehensive loss, tax effect		3
Accumulated other comprehensive loss, net of tax		(5)
Unrealized Actuarial Losses-Pension [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, before-tax amount	(1,849)	(1,792)
Accumulated other comprehensive loss, tax effect	628	609
Accumulated other comprehensive loss, net of tax	$ (1,221)	$ (1,183)