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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Comprehensive Income Net Of Tax [Abstract] |  |  |  |
Unrealized holding gains (losses) on available-for-sale securities during the year, pre-tax |  | $ 15,836 | $ 17,513 | $ (5,343)
Reclassification adjustment for (gains) losses included in net income, pre-tax | [1] | 430 | 11 | (283)
Net other comprehensive income (loss), pre-tax |  | 16,266 | 17,524 | (5,626)
Unrealized holding gains (losses) on available-for-sale securities during the year, tax |  | (3,970) | (3,666) | 1,110
Reclassification adjustment for (gains) losses included in net income, tax | [1] | (90) | (2) | 59
Net other comprehensive income (loss), tax |  | (4,060) | (3,668) | 1,169
Unrealized holding gains (losses) on available-for-sale securities during the year, after tax |  | 11,866 | 13,847 | (4,233)
Reclassification adjustment for (gains) losses included in net income, after-tax | [1] | 340 | 9 | (224)
Net other comprehensive income (loss), after-tax |  | $ 12,206 | $ 13,856 | $ (4,457)
[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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