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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss, Net of Taxes) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Unrealized Loss on Securities $ (3,990) $ (2,159)
Defined Benefit Plans 84 85
Accumulated Other Comprehensive Loss $ (3,906) $ (2,074)