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Tax Effects on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pre-Tax Amount |  |  |
Other Comprehensive Income | $ 26,232 | $ 14,537 | $ (497)
Tax (Expense) Benefit |  |  |
Other Comprehensive Income | (5,591) | (3,100) | 106
Net of Tax Amount |  |  |
Other comprehensive income (loss) | 20,641 | 11,437 | (391)
Accumulated Net Investment Gain (Loss) Attributable to Parent |  |  |
Pre-Tax Amount |  |  |
Net change in unrealized gains (losses) on debt securities available-for sale | 22,683 | 15,793 | (6,794)
Net available-for-sale securities (gains) losses reclassified into earnings | 0 | 26 | 0
Tax (Expense) Benefit |  |  |
Net change in unrealized gains (losses) on debt securities available-for sale | (4,827) | (3,367) | 1,449
Net available-for-sale securities (gains) losses reclassified into earnings | 0 | (6) | 0
Net of Tax Amount |  |  |
Net change in unrealized gains (losses) on debt securities available-for sale | 17,856 | 12,426 | (5,345)
Net available-for-sale securities (gains) losses reclassified into earnings | 0 | 20 | 0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |
Pre-Tax Amount |  |  |
Other Comprehensive Income | 3,549 | (1,282) | 6,297
Tax (Expense) Benefit |  |  |
Other Comprehensive Income | (764) | 273 | (1,343)
Net of Tax Amount |  |  |
Other comprehensive income (loss) | $ 2,785 | $ (1,009) | $ 4,954

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