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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Unrealized Gain (Loss) on Securities Available for Sale      
Beginning balance $ (1,694) $ (1,947) $ (709)
Other comprehensive income (loss) before reclassifications (7,800) 405 (1,236)
Amounts reclassified from accumulated other comprehensive income 148 (2)
Net current-period other comprehensive income (loss) (7,800) 553 (1,238)
Reclassification of accumulated other comprehensive income to retained earnings due to statutory tax changes   (300)  
Ending balance (9,494) (1,694) (1,947)
Additional Pension Asset (Liability)      
Beginning balance (2,452) (3,160) (2,841)
Other comprehensive income (loss) before reclassifications (31) 1,008 (442)
Amounts reclassified from accumulated other comprehensive income 16 136 123
Net current-period other comprehensive income (loss) (15) 1,144 (319)
Reclassification of accumulated other comprehensive income to retained earnings due to statutory tax changes   (436)  
Ending balance (2,467) (2,452) (3,160)
Total      
Beginning balance (4,146) (5,107) (3,550)
Other comprehensive income (loss) before reclassifications (7,831) 1,413 (1,678)
Amounts reclassified from accumulated other comprehensive income 16 284 121
Net current-period other comprehensive income (loss) (7,815) 1,697 (1,557)
Reclassification of accumulated other comprehensive income to retained earnings due to statutory tax changes   (736)  
Ending balance $ (11,961) $ (4,146) $ (5,107)