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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Comprehensive Income Net Of Tax [Abstract] |  |  |  |  |
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax |  | $ (4,929) | $ (679) | $ (14,057) | $ 5,642
Reclassification adjustment for (gains) losses included in net income, pre-tax | [1] | 27 | 0 | 24 | 1
Net other comprehensive income (loss), pre-tax |  | (4,902) | (679) | (14,033) | 5,643
Unrealized holding gains (losses) on available-for-sale securities during the period, tax |  | 1,036 | 239 | 2,940 | (1,975)
Reclassification adjustment for (gains) losses included in net income, tax | [1] | (6) | 0 | (5) | (1)
Net other comprehensive income (loss), tax |  | 1,030 | 239 | 2,935 | (1,976)
Unrealized holding gains (losses) on available-for-sale securities during the period, after tax |  | (3,893) | (440) | (11,117) | 3,667
Reclassification adjustment for (gains) losses included in net income, after-tax | [1] | 21 | 0 | 19 | 0
Other comprehensive income (loss), net of tax |  | $ (3,872) | $ (440) | $ (11,098) | $ 3,667
[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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