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Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pre-Tax Amount |  |  |  |  |
Other Comprehensive Income/(Loss), Pre-Tax Amount | $ 9,420 | $ (1,594) | $ 17,271 | $ (10,447) |
Tax (Expense) Benefit |  |  |  |  |
Other Comprehensive Income/(Loss), Tax (Expense) Benefit | (2,008) | 338 | (3,683) | 2,218 |
Net of Tax Amount |  |  |  |  |
Other Comprehensive Income/(Loss), Net of Tax Amount | 7,412 | (1,256) | 13,588 | (8,229) |
Accumulated Net Investment Gain (Loss) Attributable to Parent |  |  |  |  |
Pre-Tax Amount |  |  |  |  |
Change in net unrealized gains/(losses) on debt securities available-for-sale | 8,968 | (2,296) | 16,366 | (11,770) | [1]
Tax (Expense) Benefit |  |  |  |  |
Change in net unrealized gains/(losses) on debt securities available-for-sale | (1,912) | 487 | (3,490) | 2,499 | [1]
Net of Tax Amount |  |  |  |  |
Change in net unrealized gains/(losses) on debt securities available-for-sale | 7,056 | (1,809) | 12,876 | (9,271) | [1]
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |  |  |
Pre-Tax Amount |  |  |  |  |
Other Comprehensive Income/(Loss), Pre-Tax Amount | 452 | 702 | 905 | 1,323 |
Tax (Expense) Benefit |  |  |  |  |
Other Comprehensive Income/(Loss), Tax (Expense) Benefit | (96) | (149) | (193) | (281) |
Net of Tax Amount |  |  |  |  |
Other Comprehensive Income/(Loss), Net of Tax Amount | $ 356 | $ 553 | $ 712 | $ 1,042 |
[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 debt securities for the period ended September 30, 2017.

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