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Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) $ (7,264) $ (11,961) $ (9,693) $ (4,146)
Unrealized gain (loss) on securities available for sale [Member]        
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) (6,487) (12,390) (9,501)  
Deferred tax asset (liability) 1,516 2,896 2,220  
Total accumulated other comprehensive income (loss) (4,971) (9,494) (7,281) (1,694)
Additional pension asset (liability) [Member]        
The components of accumulated other comprehensive income (loss):        
Total accumulated other comprehensive income (loss) (2,992) (3,220) (3,148)  
Deferred tax asset (liability) 699 753 736  
Total accumulated other comprehensive income (loss) $ (2,293) $ (2,467) $ (2,412) $ (2,452)