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Comprehensive Income (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated other comprehensive income (loss), beginning balance $ (5,107) $ (3,550)
Other comprehensive income (loss) before reclassifications 706 498
Amounts reclassified from accumulated other comprehensive income 179 29
Net current-period other comprehensive income (loss) 885 527
Accumulated other comprehensive income (loss), ending balance (4,222) (3,023)
Unrealized gain (loss) on securities available for sale [Member]    
Accumulated other comprehensive income (loss), beginning balance (1,947) (709)
Other comprehensive income (loss) before reclassifications 706 498
Amounts reclassified from accumulated other comprehensive income 148 (2)
Net current-period other comprehensive income (loss) 854 496
Accumulated other comprehensive income (loss), ending balance (1,093) (213)
Additional pension asset (liability) [Member]    
Accumulated other comprehensive income (loss), beginning balance (3,160) (2,841)
Other comprehensive income (loss) before reclassifications
Amounts reclassified from accumulated other comprehensive income 31 31
Net current-period other comprehensive income (loss) 31 31
Accumulated other comprehensive income (loss), ending balance $ (3,129) $ (2,810)