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Accumulated Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (loss) $ 5,123 $ (11,961)  
Unrealized Gain (Loss) on Securities Available for Sale      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (loss) 9,743 (12,390) $ (2,211)
Deferred tax asset (liability) (2,239) 2,896 517
Total accumulated other comprehensive income (loss) 7,504 (9,494) (1,694)
Postretirement Plans Asset (Liability)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (loss) (3,092) (3,220) (3,200)
Deferred tax asset (liability) 711 753 748
Total accumulated other comprehensive income (loss) (2,381) (2,467) (2,452)
Total      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (loss) $ 5,123 $ (11,961) $ (4,146)