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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Unrealized Gain (Loss) on Securities Available for Sale      
Beginning balance $ (421) $ (1,232)  
Other comprehensive income (loss) before reclassifications (289) 1,290  
Amounts reclassified from accumulated other comprehensive income 1 (479)  
Net current-period other comprehensive income (loss) (288) 811  
Ending balance (709) (421) $ (1,232)
Additional Pension Asset (Liability)      
Beginning balance (157) 3,132  
Other comprehensive income (loss) before reclassifications (2,636) (3,154)  
Amounts reclassified from accumulated other comprehensive income (48) (135)  
Net current-period other comprehensive income (loss) (2,684) (3,289)  
Ending balance (2,841) (157) 3,132
Total      
Beginning balance (578) 1,900  
Other comprehensive income (loss) before reclassifications (2,925) (1,864)  
Amounts reclassified from accumulated other comprehensive income (47) (614)  
Net current-period other comprehensive income (loss) (2,972) (2,478) 2,076
Ending balance $ (3,550) $ (578) $ 1,900