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Summary of Significant Accounting Policies (Schedule of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Unrealized Gain (Loss) on Securities Available for Sale      
Beginning balance $ (1,947) $ (709)  
Other comprehensive income (loss) before reclassifications 405 (1,236)  
Amounts reclassified from accumulated other comprehensive income 148 (2)  
Net current-period other comprehensive income (loss) 553 (1,238)  
Reclassification of accumulated other comprehensive income to retained earnings due to statutory tax changes (300)    
Ending balance (1,694) (1,947) $ (709)
Additional Pension Asset (Liability)      
Beginning balance 3,160 2,841  
Other comprehensive income (loss) before reclassifications 1,008 (442)  
Amounts reclassified from accumulated other comprehensive income 136 123  
Net current-period other comprehensive income (loss) 1,144 (319)  
Reclassification of accumulated other comprehensive income to retained earnings due to statutory tax changes (436)    
Ending balance 2,452 3,160 2,841
Total      
Beginning balance (5,107) (3,550)  
Other comprehensive income (loss) before reclassifications 1,413 (1,678)  
Amounts reclassified from accumulated other comprehensive income 284 121  
Net current-period other comprehensive income (loss) 1,697 (1,557) (2,972)
Reclassification of accumulated other comprehensive income to retained earnings due to statutory tax changes (736)    
Ending balance $ (4,146) $ (5,107) $ (3,550)