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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Comprehensive Income Net Of Tax [Abstract] |  |  |  |
Unrealized holding gains (losses) on available-for-sale securities during the year, pre-tax |  | $ 17,513 | $ (5,343) | $ 5,107
Reclassification adjustment for gains included in net income, pre-tax | [1] | 11 | (283) | (4)
Net unrealized holding gains (losses) |  | 17,524 | (5,626) | 5,103
Change in funded status of post-retirement health plan, pre-tax |  | 0 | 0 | (55)
Net other comprehensive income (loss), pre-tax |  | 17,524 | (5,626) | 5,048
Unrealized holding gains (losses) on available-for-sale securities during the year, tax |  | (3,666) | 1,110 | (1,788)
Reclassification adjustment for gains included in net income, tax | [1] | (2) | 59 | 2
Net unrealized gains (losses) on available-for-sale securities, tax |  | (3,668) | 1,169 | (1,786)
Change in funded status of post-retirement health plan, tax |  | 0 | 0 | 19
Net other comprehensive income (loss), tax |  | (3,668) | 1,169 | (1,767)
Unrealized holding gains (losses) on available-for-sale securities during the year, after tax |  | 13,847 | (4,233) | 3,319
Reclassification adjustment for gains included in net income, after-tax | [1] | 9 | (224) | (2)
Unrealized holding gains (losses), net of reclassification and tax |  | 13,856 | (4,457) | 3,317
Change in funded status of post-retirement health plan, after-tax |  | 0 | 0 | (36)
Other comprehensive income (loss), net of tax |  | $ 13,856 | $ (4,457) | $ 3,281
[1] | Pre-tax reclassification adjustments relating to available-for-sale securities are reported in security gains and the tax impact is included in income tax expense on the consolidated statements of income.

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