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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Components of Other Comprehensive Income (Loss) | The following table presents the components of other comprehensive income (loss), both gross and net of tax, for the three and nine months ended September 30, 2017 and 2016 (in thousands):
|  | Three months ended September 30,
|  | 2017 |  | 2016
|  | Before Tax |  | Tax Effect |  | After Tax |  | Before Tax |  | Tax Effect |  | After Tax
Components of Other Comprehensive Income: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains and losses on securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
Net gains (losses) arising during the period |  | $ | 799 |  |  | (320 | ) |  | 479 |  |  | (2,575 | ) |  | 1,034 |  |  | (1,541 | )
Reclassification adjustment for gains included in net income |  | — |  |  | — |  |  | — |  |  | 43 |  |  | (17 | ) |  | 26 |
Total |  | 799 |  |  | (320 | ) |  | 479 |  |  | (2,532 | ) |  | 1,017 |  |  | (1,515 | )
Unrealized gains on derivatives (cash flow hedges) |  | 90 |  |  | (36 | ) |  | 54 |  |  | 384 |  |  | (154 | ) |  | 230 |
Amortization related to post-retirement obligations |  | 61 |  |  | (25 | ) |  | 36 |  |  | 236 |  |  | (95 | ) |  | 141 |
Total other comprehensive income (loss) |  | $ | 950 |  |  | (381 | ) |  | 569 |  |  | (1,912 | ) |  | 768 |  |  | (1,144 | )
|  | Nine months ended September 30,
|  | 2017 |  | 2016
|  | Before Tax |  | Tax Effect |  | After Tax |  | Before Tax |  | Tax Effect |  | After Tax
Components of Other Comprehensive Income: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains and losses on securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
Net gains arising during the period |  | $ | 4,136 |  |  | (1,658 | ) |  | 2,478 |  |  | 14,260 |  |  | (5,727 | ) |  | 8,533 |
Reclassification adjustment for gains included in net income |  | — |  |  | — |  |  | — |  |  | (54 | ) |  | 22 |  |  | (32 | )
Total |  | 4,136 |  |  | (1,658 | ) |  | 2,478 |  |  | 14,206 |  |  | (5,705 | ) |  | 8,501 |
Unrealized gains (losses) on derivatives (cash flow hedges) |  | 177 |  |  | (71 | ) |  | 106 |  |  | (603 | ) |  | 242 |  |  | (361 | )
Amortization related to post-retirement obligations |  | 183 |  |  | (78 | ) |  | 105 |  |  | 635 |  |  | (255 | ) |  | 380 |
Total other comprehensive income |  | $ | 4,496 |  |  | (1,807 | ) |  | 2,689 |  |  | 14,238 |  |  | (5,718 | ) |  | 8,520 |
Components of Accumulated Other Comprehensive Income, Net of Tax | The following tables present the changes in the components of accumulated other comprehensive income (loss), net of tax, for the three and nine months ended September 30, 2017 and 2016 (in thousands):
|  | Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax for the three months ended September 30,
|  | 2017 |  | 2016
|  | Unrealized Gains on Securities Available for Sale |  | Post- Retirement Obligations |  | Unrealized gains on Derivatives (cash flow hedges) |  | Accumulated Other Comprehensive Income (Loss) |  | Unrealized Gains on Securities Available for Sale |  | Post- Retirement Obligations |  | Unrealized (losses) on Derivatives (cash flow hedges) |  | Accumulated Other Comprehensive Income (Loss)
Balance at June 30, |  | $ | 1,489 |  |  | (2,987 | ) |  | 221 |  |  | (1,277 | ) |  | 13,967 |  |  | (6,185 | ) |  | (664 | ) |  | 7,118 |
Current period other comprehensive income (loss) |  | 479 |  |  | 36 |  |  | 54 |  |  | 569 |  |  | (1,515 | ) |  | 141 |  |  | 230 |  |  | (1,144 | )
Balance at September 30, |  | $ | 1,968 |  |  | (2,951 | ) |  | 275 |  |  | (708 | ) |  | 12,452 |  |  | (6,044 | ) |  | (434 | ) |  | 5,974 |
|  | Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax for the nine months ended September 30,
|  | 2017 |  | 2016
|  | Unrealized Gains on Securities Available for Sale |  | Post- Retirement Obligations |  | Unrealized gains on Derivatives (cash flow hedges) |  | Accumulated Other Comprehensive Income (Loss) |  | Unrealized Gains on Securities Available for Sale |  | Post- Retirement Obligations |  | Unrealized (losses) on Derivatives (cash flow hedges) |  | Accumulated Other Comprehensive Income (Loss)
Balance at December 31, |  | $ | (510 | ) |  | (3,056 | ) |  | 169 |  |  | (3,397 | ) |  | 3,951 |  |  | (6,424 | ) |  | (73 | ) |  | (2,546 | )
Current period other comprehensive income (loss) |  | 2,478 |  |  | 105 |  |  | 106 |  |  | 2,689 |  |  | 8,501 |  |  | 380 |  |  | (361 | ) |  | 8,520 |
Balance at September 30, |  | $ | 1,968 |  |  | (2,951 | ) |  | 275 |  |  | (708 | ) |  | 12,452 |  |  | (6,044 | ) |  | (434 | ) |  | 5,974 |
Summary of Reclassifications Out of Accumulated Other Comprehensive Income | The following tables summarize the reclassifications out of accumulated other comprehensive income to the consolidated statements of income for the three and nine months ended September 30, 2017 and 2016 (in thousands):
|  | Reclassifications From Accumulated Other Comprehensive Income ("AOCI")
|  | Amount reclassified from AOCI for the three months ended September 30, |  | Affected line item in the Consolidated Statement of Income
|  | 2017 |  | 2016 |
Details of AOCI: |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Realized net losses on the sale of securities available for sale |  | $ | — |  |  | (43 | ) |  | Net gain on securities transactions
|  | — |  |  | 17 |  |  | Income tax expense
|  | — |  |  | (26 | ) |  | Net of tax
Post-retirement obligations: |  |  |  |  |  |
Amortization of actuarial losses |  | 61 |  |  | 236 |  |  | Compensation and employee benefits (1)
|  | (25 | ) |  | (95 | ) |  | Income tax expense
|  | 36 |  |  | 141 |  |  | Net of tax
Total reclassifications |  | $ | 36 |  |  | 115 |  |  | Net of tax
|  | Reclassifications From Accumulated Other Comprehensive Income ("AOCI")
|  | Amount reclassified from AOCI for the nine months ended September 30, |  | Affected line item in the Consolidated Statement of Income
|  | 2017 |  | 2016 |
Details of AOCI: |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Realized net gains on the sale of securities available for sale |  | $ | — |  |  | 54 |  |  | Net gain on securities transactions
|  | — |  |  | (22 | ) |  | Income tax expense
|  | — |  |  | 32 |  |  | Net of tax
Post-retirement obligations: |  |  |  |  |  |
Amortization of actuarial losses |  | 183 |  |  | 708 |  |  | Compensation and employee benefits (1)
|  | (78 | ) |  | (284 | ) |  | Income tax expense
|  | 105 |  |  | 424 |  |  | Net of tax
Total reclassifications |  | $ | 105 |  |  | 456 |  |  | Net of tax
(1) | This item is included in the computation of net periodic benefit cost. See Note 5. Components of Net Periodic Benefit Cost.

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