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Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) $ (2,782) $ (5,107) $ (1,551) $ (3,550)
Unrealized gain (loss) on securities available for sale [Member]        
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) 438 (3,085) 1,964  
Deferred tax asset (liability) (162) 1,138 (767)  
Total accumulated other comprehensive income (loss) 276 (1,947) 1,197 (709)
Additional pension asset (liability) [Member]        
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) (4,854) (5,012) (4,505)  
Deferred tax asset (liability) 1,796 1,852 1,757  
Total accumulated other comprehensive income (loss) $ (3,058) $ (3,160) $ (2,748) $ (2,841)