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Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (2,412) | $ (8,758) | $ (2,412) | $ (8,758) | $ (3,493) | $ (9,401) | $ (14,048) | $ (14,529)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 1,081 | 5,290 | 6,989 | 5,771 |  |  |  |
Net securities gains (losses) | 13 | 9 | 26 | 23 |  |  |  |
Income tax expense | (3,015) | (2,927) | (16,527) | (8,098) |  |  |  |
Unrealized gain (loss) on securities, net of tax | 8,162 | 8,398 | 30,069 | 23,082 |  |  |  |
Change in funded status of post retirement benefits | 304 | 819 | 912 | 4,102 |  |  |  |
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 | 313 | 826 | 929 | 4,117 |  |  |  |
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 | 13,783 | 8,660 | 13,783 | 8,660 | 13,120 | 6,083 | 4,429 | 7,164
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 663 | 4,231 | 7,700 | 1,496 |  |  |  |
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 | 1,347 | 3,287 | 1,347 | 3,287 | 1,233 | 2,970 | 3,047 | 3,114
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 114 | 240 | (1,623) | 173 |  |  |  |
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 | 15,130 | 11,947 | 15,130 | 11,947 | 14,353 | 9,053 | 7,476 | 10,278
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 777 | 4,471 | 6,077 | 1,669 |  |  |  |
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) | 13 | 9 | 26 | 23 |  |  |  |
Income tax expense | 4 | 2 | 9 | 8 |  |  |  |
Unrealized gain (loss) on securities, net of tax | 9 | 7 | 17 | 15 |  |  |  |
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 | (17,542) | (20,705) | (17,542) | (20,705) | $ (17,846) | $ (18,454) | $ (21,524) | $ (24,807)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 304 | 819 | 912 | 4,102 |  |  |  |
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 | 609 | 2,735 |  |  |  |
Unrealized gain (loss) on securities, net of tax | 304 | 819 | 912 | 4,102 |  |  |  |
Change in funded status of post retirement benefits | $ 507 | $ 1,365 | $ 1,521 | $ 6,837 |  |  |  |

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