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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2017
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 June 30, 2017 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding gains on securities | $ | 4,188 |  |  | $ | 1,619 |  |  | $ | 2,569 |
Amortization of unrealized holding gains on securities transferred to the held to maturity category | (29 | ) |  | (11 | ) |  | (18 | )
Total securities available for sale | 4,159 |  |  | 1,608 |  |  | 2,551 |
Derivative instruments: |  |  |  |  |
Unrealized holding losses on derivative instruments | (270 | ) |  | (105 | ) |  | (165 | )
Total derivative instruments | (270 | ) |  | (105 | ) |  | (165 | )
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 91 |  |  | 35 |  |  | 56 |
Total defined benefit pension and post-retirement benefit plans | 91 |  |  | 35 |  |  | 56 |
Total other comprehensive income | $ | 3,980 |  |  | $ | 1,538 |  |  | $ | 2,442 |
Three months ended June 30, 2016 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding gains on securities | $ | 1,326 |  |  | $ | 514 |  |  | $ | 812 |
Reclassification adjustment for gains realized in net income | (1,257 | ) |  | (485 | ) |  | (772 | )
Amortization of unrealized holding gains on securities transferred to the held to maturity category | (28 | ) |  | (10 | ) |  | (18 | )
Total securities available for sale | 41 |  |  | 19 |  |  | 22 |
Derivative instruments: |  |  |  |  |
Unrealized holding losses on derivative instruments | (704 | ) |  | (276 | ) |  | (428 | )
Total derivative instruments | (704 | ) |  | (276 | ) |  | (428 | )
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 119 |  |  | 39 |  |  | 80 |
Total defined benefit pension and post-retirement benefit plans | 119 |  |  | 39 |  |  | 80 |
Total other comprehensive loss | $ | (544 | ) |  | $ | (218 | ) |  | $ | (326 | )
| Pre-Tax |  | Tax Expense (Benefit) |  | Net of Tax
Six months ended June 30, 2017 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding gains on securities | $ | 8,927 |  |  | $ | 3,451 |  |  | $ | 5,476 |
Amortization of unrealized holding gains on securities transferred to the held to maturity category | (275 | ) |  | (106 | ) |  | (169 | )
Total securities available for sale | 8,652 |  |  | 3,345 |  |  | 5,307 |
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 6 |  |  | 2 |  |  | 4 |
Total derivative instruments | 6 |  |  | 2 |  |  | 4 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 204 |  |  | 79 |  |  | 125 |
Total defined benefit pension and post-retirement benefit plans | 204 |  |  | 79 |  |  | 125 |
Total other comprehensive income | $ | 8,862 |  |  | $ | 3,426 |  |  | $ | 5,436 |
Six months ended June 30, 2016 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding gains on securities | $ | 6,315 |  |  | $ | 2,440 |  |  | $ | 3,875 |
Reclassification adjustment for gains realized in net income | (1,186 | ) |  | (458 | ) |  | (728 | )
Amortization of unrealized holding gains on securities transferred to the held to maturity category | (61 | ) |  | (23 | ) |  | (38 | )
Total securities available for sale | 5,068 |  |  | 1,959 |  |  | 3,109 |
Derivative instruments: |  |  |  |  |
Unrealized holding losses on derivative instruments | (2,766 | ) |  | (1,072 | ) |  | (1,694 | )
Total derivative instruments | (2,766 | ) |  | (1,072 | ) |  | (1,694 | )
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 236 |  |  | 84 |  |  | 152 |
Total defined benefit pension and post-retirement benefit plans | 236 |  |  | 84 |  |  | 152 |
Total other comprehensive income | $ | 2,538 |  |  | $ | 971 |  |  | $ | 1,567 |
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:
| June 30, 2017 |  | December 31, 2016
Unrealized gains on securities | $ | 14,797 |  |  | $ | 9,490 |
Non-credit related portion of other-than-temporary impairment on securities | (16,719 | ) |  | (16,719 | )
Unrealized losses on derivative instruments | (1,351 | ) |  | (1,355 | )
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations | (7,195 | ) |  | (7,320 | )
Total accumulated other comprehensive loss | $ | (10,468 | ) |  | $ | (15,904 | )

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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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