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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Comprehensive Income Net Of Tax [Abstract] |  |  |
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax |  | $ 5,821 | $ (8,886)
Reclassification adjustment for (gains) losses included in net income, pre-tax | [1] | 34 | (2)
Net other comprehensive income (loss), pre-tax |  | 5,855 | (8,888)
Unrealized holding gains (losses) on available-for-sale securities during the period, tax |  | (1,223) | 1,866
Reclassification adjustment for (gains) losses included in net income, tax | [1] | (7) | 0
Net other comprehensive income (loss), tax |  | (1,230) | 1,866
Unrealized holding gains (losses) on available-for-sale securities during the period, after tax |  | 4,598 | (7,020)
Reclassification adjustment for (gains) losses included in net income, after-tax | [1] | 27 | (2)
Other comprehensive income (loss), net of tax |  | $ 4,625 | $ (7,022)
[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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