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Summary of Significant Accounting Policies (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
The components of accumulated other comprehensive income (loss):      
Unrealized gain (loss) on securities available for sale $ (2,211) $ (3,085) $ (1,163)
Deferred tax asset (liability) 517 1,138 454
Net unrealized gain (loss) on securities available for sale (1,694) (1,947) (709)
Additional pension asset (liability) (3,200) (5,012) (4,657)
Deferred tax asset (liability) 748 1,852 1,816
Net additional pension asset (liability) (2,452) (3,160) (2,841)
Total accumulated other comprehensive income (loss) $ (4,146) $ (5,107) $ (3,550)