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Summary of Significant Accounting Policies (Schedule of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unrealized Gain (Loss) on Securities Available for Sale |  |  |
Beginning balance | $ (1,947) | $ (709) |
Other comprehensive income (loss) before reclassifications | 405 | (1,236) |
Amounts reclassified from accumulated other comprehensive income | 148 | (2) |
Net current-period other comprehensive income (loss) | 553 | (1,238) |
Reclassification of accumulated other comprehensive income to retained earnings due to statutory tax changes | (300) |  |
Ending balance | (1,694) | (1,947) | $ (709)
Additional Pension Asset (Liability) |  |  |
Beginning balance | 3,160 | 2,841 |
Other comprehensive income (loss) before reclassifications | 1,008 | (442) |
Amounts reclassified from accumulated other comprehensive income | 136 | 123 |
Net current-period other comprehensive income (loss) | 1,144 | (319) |
Reclassification of accumulated other comprehensive income to retained earnings due to statutory tax changes | (436) |  |
Ending balance | 2,452 | 3,160 | 2,841
Total |  |  |
Beginning balance | (5,107) | (3,550) |
Other comprehensive income (loss) before reclassifications | 1,413 | (1,678) |
Amounts reclassified from accumulated other comprehensive income | 284 | 121 |
Net current-period other comprehensive income (loss) | 1,697 | (1,557) | (2,972)
Reclassification of accumulated other comprehensive income to retained earnings due to statutory tax changes | (736) |  |
Ending balance | $ (4,146) | $ (5,107) | $ (3,550)

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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