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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2018 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (4,025 | ) |  | $ | (1,025 | ) |  | $ | (3,000 | )
Total securities available for sale | (4,025 | ) |  | (1,025 | ) |  | (3,000 | )
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 519 |  |  | 132 |  |  | 387 |
Total derivative instruments | 519 |  |  | 132 |  |  | 387 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 77 |  |  | 20 |  |  | 57 |
Total defined benefit pension and post-retirement benefit plans | 77 |  |  | 20 |  |  | 57 |
Total other comprehensive loss | $ | (3,429 | ) |  | $ | (873 | ) |  | $ | (2,556 | )
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 |
| Pre-Tax |  | Tax Expense (Benefit) |  | Net of Tax
Six months ended June 30, 2018 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (14,634 | ) |  | $ | (3,725 | ) |  | $ | (10,909 | )
Total securities available for sale | (14,634 | ) |  | (3,725 | ) |  | (10,909 | )
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 1,670 |  |  | 425 |  |  | 1,245 |
Total derivative instruments | 1,670 |  |  | 425 |  |  | 1,245 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 164 |  |  | 41 |  |  | 123 |
Total defined benefit pension and post-retirement benefit plans | 164 |  |  | 41 |  |  | 123 |
Total other comprehensive loss | $ | (12,800 | ) |  | $ | (3,259 | ) |  | $ | (9,541 | )
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 |
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, 2018 |  | December 31, 2017
Unrealized gains (losses) on securities | $ | (1,540 | ) |  | $ | 7,363 |
Non-credit related portion of other-than-temporary impairment on securities | (11,319 | ) |  | (9,313 | )
Unrealized gains (losses) on derivative instruments | 250 |  |  | (995 | )
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations | (7,443 | ) |  | (7,566 | )
Total accumulated other comprehensive loss | $ | (20,052 | ) |  | $ | (10,511 | )

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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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