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Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net securities gains (losses) | $ 10 | $ (1) | $ 14 | $ (1)
Income tax expense | (2,319) | (3,990) | (5,171) | (7,747)
Unrealized gain (loss) on securities, net of tax | 6,923 | 8,488 | 14,684 | 16,319
Change in funded status of post retirement benefits | 819 | 115 | 3,283 | 230
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 | 826 | (116) | 3,291 | (231)
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) | 10 | (1) | 14 | (1)
Income tax expense | 3 | 0 | 6 | 0
Unrealized gain (loss) on securities, net of tax | 7 | (1) | 8 | (1)
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 | (546) | 122 | (2,189) | 244
Unrealized gain (loss) on securities, net of tax | 819 | (115) | 3,283 | (230)
Change in funded status of post retirement benefits | $ 1,365 | $ (237) | $ 5,472 | $ (474)

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