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Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net securities gains (losses) | $ 6 | $ 3 | $ 18 | $ 5
Income tax expense | (2,579) | (2,656) | (8,000) | (8,941)
Unrealized gain (loss) on securities, net of tax | 12,257 | 11,313 | 34,508 | 35,527
Change in funded status of post retirement benefits | 303 | 281 | 910 | 843
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 | (299) | (279) | (897) | (839)
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) | 6 | 3 | 18 | 5
Income tax expense | (2) | (1) | (5) | (1)
Unrealized gain (loss) on securities, net of tax | 4 | 2 | 13 | 4
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 | 86 | 81 | 258 | 242
Unrealized gain (loss) on securities, net of tax | (303) | (281) | (910) | (843)
Change in funded status of post retirement benefits | $ (389) | $ (362) | $ (1,168) | $ (1,085)

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