Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Loss [Abstract]
Net unrealized loss on AFS securities, Before-Tax Amount	$ (2,786)	$ (1,772)
Net unrealized loss on AFS securities, Tax Effect	585	603
Net unrealized loss on AFS securities, Net-of-Tax Amount	(2,201)	(1,169)
Unrealized actuarial losses-pension, Before-Tax Amount	(1,849)	(1,849)
Unrealized actuarial losses-pension, Tax Effect	388	628
Unrealized actuarial losses-pension, Net-of-Tax Amount	(1,461)	(1,221)
Total of all items above, Before-Tax Amount	(4,635)	(3,621)
Total of all items above, Tax Effect	973	1,231
Accumulated other comprehensive loss, net of tax	$ (3,662)	$ (2,390)