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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)

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