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Tax Effects on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pre-Tax Amount |  |  |  |
Other Comprehensive Income | $ 14,537 | $ (497) |  | $ (6,267)
Tax (Expense) Benefit |  |  |  |
Other Comprehensive Loss | (3,100) | 106 |  | 1,624
Net of Tax Amount |  |  |  |
Other comprehensive income (loss) | 11,437 | (391) |  | (4,643)
Accumulated Net Investment Gain (Loss) Attributable to Parent |  |  |  |
Pre-Tax Amount |  |  |  |
Net change in unrealized (losses)/gains on debt securities available-for sale | 15,793 | (6,794) | [1] | (1,275)
Net available-for-sale securities losses reclassified into earnings | 26 | 0 |  | (3,000)
Tax (Expense) Benefit |  |  |  |
Net change in unrealized (losses)/gains on debt securities available-for sale | (3,367) | 1,449 | [1] | 448
Net available-for-sale securities losses reclassified into earnings | (6) | 0 |  | 1,054
Net of Tax Amount |  |  |  |
Net change in unrealized (losses)/gains on debt securities available-for sale | 12,426 | (5,345) | [1] | (827)
Net available-for-sale securities losses reclassified into earnings | 20 | 0 |  | (1,946)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |  |
Pre-Tax Amount |  |  |  |
Other Comprehensive Income | (1,282) | 6,297 |  | (1,992)
Tax (Expense) Benefit |  |  |  |
Other Comprehensive Loss | 273 | (1,343) |  | 122
Net of Tax Amount |  |  |  |
Other comprehensive income (loss) | $ (1,009) | $ 4,954 |  | $ (1,870)
[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 prior period ended December 31, 2017.

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