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Summary of Significant Accounting Policies (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
The components of accumulated other comprehensive income (loss):        
Unrealized gain (loss) on securities available for sale $ (12,390) $ (2,211) $ (3,085)  
Deferred tax asset (liability) 2,896 517 1,138  
Net unrealized gain (loss) on securities available for sale (9,494) (1,694) (1,947) $ (709)
Additional pension asset (liability) (3,220) (3,200) (5,012)  
Deferred tax asset (liability) 753 748 1,852  
Net additional pension asset (liability) (2,467) (2,452) (3,160) (2,841)
Total accumulated other comprehensive income (loss) $ (11,961) $ (4,146) $ (5,107) $ (3,550)