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Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net securities gains (losses) | $ 3 | $ 27 | $ 5 | $ 44
Income tax expense | (2,656) | (3,385) | (8,941) | (10,592)
Unrealized gain (loss) on securities, net of tax | 11,313 | 8,794 | 35,527 | 26,515
Change in funded status of post retirement benefits | 281 | 184 | $ 843 | $ 551
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 | (279) | (166) |  |
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) | 3 | 27 |  |
Income tax expense | (1) | (9) |  |
Unrealized gain (loss) on securities, net of tax | 2 | 18 |  |
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 | 81 | 117 |  |
Unrealized gain (loss) on securities, net of tax | (281) | (184) |  |
Change in funded status of post retirement benefits | $ (362) | $ (301) |  |

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