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Other Comprehensive (Loss) Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Components of Other Comprehensive (Loss) Income | The following table presents the components of other comprehensive (loss) income both gross and net of tax, for the years ended December 31, 2017, 2016 and 2015 (in thousands):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
| Before Tax |  | Tax Effect |  | After Tax |  | Before Tax |  | Tax Effect |  | After Tax |  | Before Tax |  | Tax Effect |  | After Tax
Components of Other Comprehensive (Loss)Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains and losses on securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (losses) gains arising during the period | $ | (3,612 | ) |  | 1,449 |  |  | (2,163 | ) |  | (7,405 | ) |  | 2,974 |  |  | (4,431 | ) |  | (5,683 | ) |  | 2,282 |  |  | (3,401 | )
Reclassification adjustment for gains included in net income | — |  |  | — |  |  | — |  |  | (50 | ) |  | 20 |  |  | (30 | ) |  | (654 | ) |  | 263 |  |  | (391 | )
Total | (3,612 | ) |  | 1,449 |  |  | (2,163 | ) |  | (7,455 | ) |  | 2,994 |  |  | (4,461 | ) |  | (6,337 | ) |  | 2,545 |  |  | (3,792 | )
Unrealized gains (losses) on derivatives (cash flow hedges) | 633 |  |  | (254 | ) |  | 379 |  |  | 404 |  |  | (162 | ) |  | 242 |  |  | (122 | ) |  | 49 |  |  | (73 | )
Amortization related to post retirement obligations | (1,475 | ) |  | 586 |  |  | (889 | ) |  | 5,628 |  |  | (2,260 | ) |  | 3,368 |  |  | 2,156 |  |  | (866 | ) |  | 1,290 |
Total other comprehensive (loss) income | $ | (4,454 | ) |  | 1,781 |  |  | (2,673 | ) |  | (1,423 | ) |  | 572 |  |  | (851 | ) |  | (4,303 | ) |  | 1,728 |  |  | (2,575 | )
Changes in Accumulated Other Comprehensive Income by Component, net of tax | The components of accumulated other comprehensive loss (gain) related to the pension plan and other post-retirement benefits, on a pre-tax basis, at December 31, 2017 and 2016 are summarized in the following table (in thousands):
| Pension |  | Post-retirement
| 2017 |  | 2016 |  | 2017 |  | 2016
Unrecognized prior service cost | $ | — |  |  | — |  |  | — |  |  | — |
Unrecognized net actuarial loss (gain) | 11,091 |  |  | 11,968 |  |  | (4,781 | ) |  | (6,993 | )
Total accumulated other comprehensive loss (gain) | $ | 11,091 |  |  | 11,968 |  |  | (4,781 | ) |  | (6,993 | )
The following table presents the changes in the components of accumulated other comprehensive (loss) income, net of tax, for the years ended December 31, 2017 and 2016, including the reclassification of income tax effects due to the adoption of ASU No. 2018-02 for the year ended December 31, 2017 (in thousands):
|  | Changes in Accumulated Other Comprehensive (Loss) Income by Component, net of tax For the Years Ended December 31,
|  | 2017 |  | 2016
|  | Unrealized Gains on Securities Available for Sale |  | Post-Retirement Obligations |  | Unrealized gains (losses) on Derivatives (cash flow hedges) |  | Accumulated Other Comprehensive (Loss) Income |  | Unrealized Gains on Securities Available for Sale |  | Post-Retirement Obligations |  | Unrealized gains (losses) on Derivatives (cash flow hedges) |  | Accumulated Other Comprehensive (Loss) Income
Balance at the beginning of the period |  | $ | (510 | ) |  | (3,056 | ) |  | 169 |  |  | (3,397 | ) |  | 3,951 |  |  | (6,424 | ) |  | (73 | ) |  | (2,546 | )
Current period change in other comprehensive income (loss) |  | (2,163 | ) |  | (889 | ) |  | 379 |  |  | (2,673 | ) |  | (4,461 | ) |  | 3,368 |  |  | 242 |  |  | (851 | )
Reclassification of tax effects due to the adoption of ASU No. 2018-02 |  | (619 | ) |  | (901 | ) |  | 125 |  |  | (1,395 | ) |  | — |  |  | — |  |  | — |  |  | — |
Balance at the end of the period |  | $ | (3,292 | ) |  | (4,846 | ) |  | 673 |  |  | (7,465 | ) |  | (510 | ) |  | (3,056 | ) |  | 169 |  |  | (3,397 | )
Reclassification Out of Accumulated Other Comprehensive Income | The following table summarizes the reclassifications out of accumulated other comprehensive (loss) income for the years ended December 31, 2017, 2016 and 2015 (in thousands):
|  | Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
|  | Amount reclassified from AOCI for the years ended December 31, |  | Affected line item in the Consolidated Statement of Income
|  | 2017 |  | 2016 |  | 2015 |  |
Details of AOCI: |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
Realized net gains on the sale of securities available for sale |  | $ | — |  |  | 50 |  |  | 654 |  |  | Net gain on securities transactions
|  | — |  |  | (20 | ) |  | (263 | ) |  | Income tax expense
|  | — |  |  | 30 |  |  | 391 |  |  | Net of tax
Post-retirement obligations: |  |  |  |  |  |  |  |
Amortization of actuarial losses |  | 243 |  |  | 943 |  |  | 774 |  |  | Compensation and employee benefits (1)
|  | (64 | ) |  | (379 | ) |  | (311 | ) |  | Income tax expense
|  | 179 |  |  | 564 |  |  | 463 |  |  | Net of tax
Total reclassifications |  | $ | 179 |  |  | 594 |  |  | 854 |  |  | Net of tax
(1) This item is included in the computation of net periodic benefit cost. See Note 11. Benefit Plans

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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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