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Comprehensive Income (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) $ (1,551) $ (3,550) $ (710) $ (578)
Unrealized gain (loss) on securities available for sale [Member]        
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) 1,964 (1,163) (843)  
Deferred tax asset (liability) (767) 454 329  
Total accumulated other comprehensive income (loss) 1,197 (709) (514) (421)
Additional pension asset (liability) [Member]        
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) (4,505) (4,657) (320)  
Deferred tax asset (liability) 1,757 1,816 124  
Total accumulated other comprehensive income (loss) $ (2,748) $ (2,841) $ (196) $ (157)