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Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net securities gains (losses) | $ 27 | $ 13 | $ 44 | $ 26
Income tax expense | (3,385) | (3,015) | (10,592) | (16,527)
Unrealized gain (loss) on securities, net of tax | 8,794 | 8,162 | 26,515 | 30,069
Change in funded status of post retirement benefits | 184 | 304 | 551 | 912
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Unrealized gain (loss) on securities, net of tax | (166) | (295) | (522) | (895)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net securities gains (losses) | 27 | 13 | 44 | 26
Income tax expense | (9) | (4) | (15) | (9)
Unrealized gain (loss) on securities, net of tax | 18 | 9 | 29 | 17
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Income tax expense | 117 | 203 | 352 | 609
Unrealized gain (loss) on securities, net of tax | (184) | (304) | (551) | (912)
Change in funded status of post retirement benefits | $ (301) | $ (507) | $ (903) | $ (1,521)

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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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