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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Changes in the components of other comprehensive income (loss) | Changes in the components of other comprehensive income (loss), net of tax, were as follows for the periods presented:
| Pre-Tax |  | Tax Expense (Benefit) |  | Net of Tax
Three months ended March 31, 2018 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (10,609 | ) |  | $ | (2,700 | ) |  | $ | (7,909 | )
Total securities available for sale | (10,609 | ) |  | (2,700 | ) |  | (7,909 | )
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 1,151 |  |  | 293 |  |  | 858 |
Total derivative instruments | 1,151 |  |  | 293 |  |  | 858 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 87 |  |  | 21 |  |  | 66 |
Total defined benefit pension and post-retirement benefit plans | 87 |  |  | 21 |  |  | 66 |
Total other comprehensive loss | $ | (9,371 | ) |  | $ | (2,386 | ) |  | $ | (6,985 | )
Three months ended March 31, 2017 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding gains on securities | $ | 4,739 |  |  | $ | 1,832 |  |  | $ | 2,907 |
Amortization of unrealized holding gains on securities transferred to the held to maturity category | (246 | ) |  | (95 | ) |  | (151 | )
Total securities available for sale | 4,493 |  |  | 1,737 |  |  | 2,756 |
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 276 |  |  | 107 |  |  | 169 |
Total derivative instruments | 276 |  |  | 107 |  |  | 169 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 113 |  |  | 44 |  |  | 69 |
Total defined benefit pension and post-retirement benefit plans | 113 |  |  | 44 |  |  | 69 |
Total other comprehensive income | $ | 4,882 |  |  | $ | 1,888 |  |  | $ | 2,994 |
Accumulated balances for each component of other comprehensive income (loss), net of tax | The accumulated balances for each component of other comprehensive income (loss), net of tax, were as follows as of the dates presented:
| March 31, 2018 |  | December 31, 2017
Unrealized gains on securities | $ | 1,460 |  |  | $ | 7,363 |
Non-credit related portion of other-than-temporary impairment on securities | (11,319 | ) |  | (9,313 | )
Unrealized losses on derivative instruments | (137 | ) |  | (995 | )
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations | (7,500 | ) |  | (7,566 | )
Total accumulated other comprehensive loss | $ | (17,496 | ) |  | $ | (10,511 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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