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Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net securities gains (losses) | $ 2 | $ 15 | $ 2 | $ 17
Income tax expense | (4,346) | (3,193) | (6,285) | (7,207)
Unrealized gain (loss) on securities, net of tax | 15,261 | 8,352 | 24,214 | 17,721
Change in funded status of post retirement benefits | 281 | 184 | $ (2,302) | $ 367
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) | (174) |  |
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) | 2 | 15 |  |
Income tax expense | 0 | (5) |  |
Unrealized gain (loss) on securities, net of tax | 2 | 10 |  |
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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