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Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) $ (9,693) $ (4,146) $ (4,222) $ (5,107)
Unrealized gain (loss) on securities available for sale [Member]        
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) (9,501) (2,211) (1,737)  
Deferred tax asset (liability) 2,220 517 644  
Total accumulated other comprehensive income (loss) (7,281) (1,694) (1,093) (1,947)
Additional pension asset (liability) [Member]        
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) (3,148) (3,200) (4,961)  
Deferred tax asset (liability) 736 748 1,832  
Total accumulated other comprehensive income (loss) $ (2,412) $ (2,452) $ (3,129) $ (3,160)