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Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (3,493) | $ (14,048) | $ (3,493) | $ (14,048) | $ (5,059) | $ (9,401) | $ (7,303) | $ (14,529)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 1,566 | (6,745) | 5,908 | 481 |  |  |  |
Net securities gains (losses) | 10 | 10 | 13 | 14 |  |  |  |
Income tax expense | (2,846) | (2,319) | (13,512) | (5,171) |  |  |  |
Unrealized gain (loss) on securities, net of tax | 8,232 | 6,923 | 21,907 | 14,684 |  |  |  |
Change in funded status of post retirement benefits | 304 | 819 | 608 | 3,283 |  |  |  |
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 | 311 | 826 | 616 | 3,291 |  |  |  |
Unrealized gains losses on securities available-for-sale without other than temporary impairment [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 13,120 | 4,429 | 13,120 | 4,429 | 10,880 | 6,083 | 11,448 | 7,164
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 2,240 | (7,019) | 7,037 | (2,735) |  |  |  |
Unrealized gains losses on securities available-for-sale with other than temporary impairment [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 1,233 | 3,047 | 1,233 | 3,047 | 2,211 | 2,970 | 3,592 | 3,114
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (978) | (545) | (1,737) | (67) |  |  |  |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 14,353 | 7,476 | 14,353 | 7,476 | 13,091 | 9,053 | 15,040 | 10,278
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 1,262 | (7,564) | 5,300 | (2,802) |  |  |  |
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 | 10 | 13 | 14 |  |  |  |
Income tax expense | 3 | 3 | 5 | 6 |  |  |  |
Unrealized gain (loss) on securities, net of tax | 7 | 7 | 8 | 8 |  |  |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (17,846) | (21,524) | (17,846) | (21,524) | $ (18,150) | $ (18,454) | $ (22,343) | $ (24,807)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 304 | 819 | 608 | 3,283 |  |  |  |
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 | 203 | 546 | 406 | 2,189 |  |  |  |
Unrealized gain (loss) on securities, net of tax | 304 | 819 | 608 | 3,283 |  |  |  |
Change in funded status of post retirement benefits | $ 507 | $ 1,365 | $ 1,014 | $ 5,472 |  |  |  |

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