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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss, Net of Taxes) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Unrealized Loss on Securities $ (1,089) $ (2,919)
Defined Benefit Plans 59 66
Accumulated Other Comprehensive Loss $ (1,030) $ (2,853)