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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Pre-Tax Amount |  |  |  |  |
Other Comprehensive (Loss)/Income, Before tax |  | $ (1,594) | $ (406) | $ (10,447) | $ 1,426
Tax (Expense) Benefit |  |  |  |  |
Other Comprehensive (Loss)/Income, Tax |  | 338 | 144 | 2,218 | (500)
Net of Tax Amount |  |  |  |  |
Other Comprehensive (Loss)/Income |  | (1,256) | (262) | (8,229) | 926
Accumulated Net Investment Gain (Loss) Attributable to Parent |  |  |  |  |
Pre-Tax Amount |  |  |  |  |
Change in net unrealized gains/(losses) on debt securities available-for-sale | [1] | (2,296) | 2,672 | (11,770) | 4,335
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income | [2] | 0 | (3,617) | 0 | (3,987)
Tax (Expense) Benefit |  |  |  |  |
Change in net unrealized gains/(losses) on debt securities available-for-sale | [1] | 487 | (938) | 2,499 | (1,523)
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income | [2] | 0 | 1,270 | 0 | 1,400
Net of Tax Amount |  |  |  |  |
Change in net unrealized gains/(losses) on debt securities available-for-sale | [1] | (1,809) | 1,734 | (9,271) | 2,812
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income | [2] | 0 | (2,347) | 0 | (2,587)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |  |  |
Pre-Tax Amount |  |  |  |  |
Other Comprehensive (Loss)/Income, Before tax |  | 702 | 539 | 1,323 | 1,078
Tax (Expense) Benefit |  |  |  |  |
Other Comprehensive (Loss)/Income, Tax |  | (149) | (188) | (281) | (377)
Net of Tax Amount |  |  |  |  |
Other Comprehensive (Loss)/Income |  | $ 553 | $ 351 | $ 1,042 | $ 701
[1] | Due to the adoption of ASU No. 2016-01, net unrealized gains on marketable equity securities were reclassified from Accumulated Other Comprehensive Income to Retained Earnings during the three months ended March 31, 2018. The prior period data was not restated; as such, the change in unrealized gains on marketable securities is combined with the change in net unrealized gains on debit securities for the period ended June 30, 2017.
[2] | Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income/(loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

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