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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Unrealized Gain (Loss) on Securities Available for Sale      
Beginning balance $ (709) $ (421)  
Other comprehensive income (loss) before reclassifications (1,236) (289)  
Amounts reclassified from accumulated other comprehensive income (2) 1  
Net current-period other comprehensive income (loss) (1,238) (288)  
Ending balance (1,947) (709) $ (421)
Additional Pension Asset (Liability)      
Beginning balance (2,841) (157)  
Other comprehensive income (loss) before reclassifications (442) (2,636)  
Amounts reclassified from accumulated other comprehensive income 123 (48)  
Net current-period other comprehensive income (loss) (319) (2,684)  
Ending balance (3,160) (2,841) (157)
Total      
Beginning balance (3,550) (578)  
Other comprehensive income (loss) before reclassifications (1,678) (2,925)  
Amounts reclassified from accumulated other comprehensive income 121 (47)  
Net current-period other comprehensive income (loss) (1,557) (2,972) (2,478)
Ending balance $ (5,107) $ (3,550) $ (578)