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Summary of Significant Accounting Policies (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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The components of accumulated other comprehensive income (loss): |  |  |
Unrealized gain (loss) on securities available for sale | $ (2,211) | $ (3,085) | $ (1,163)
Deferred tax asset (liability) | 517 | 1,138 | 454
Net unrealized gain (loss) on securities available for sale | (1,694) | (1,947) | (709)
Additional pension asset (liability) | (3,200) | (5,012) | (4,657)
Deferred tax asset (liability) | 748 | 1,852 | 1,816
Net additional pension asset (liability) | (2,452) | (3,160) | (2,841)
Total accumulated other comprehensive income (loss) | $ (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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