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Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) $ (2,932) $ (5,107) $ (1,728) $ (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) 252 (3,085) 1,722  
Deferred tax asset (liability) (93) 1,138 (671)  
Total accumulated other comprehensive income (loss) 159 (1,947) 1,051 (709)
Additional pension asset (liability) [Member]        
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) (4,907) (5,012) (4,555)  
Deferred tax asset (liability) 1,816 1,852 1,776  
Total accumulated other comprehensive income (loss) $ (3,091) $ (3,160) $ (2,779) $ (2,841)