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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Comprehensive Income Net Of Tax [Abstract] |  |  |  |
Unrealized holding (losses) gains on available-for-sale securities during the year, pre-tax |  | $ 5,107 | $ (4,270) | $ (1,403)
Reclassification adjustment for (gains) losses included in net income, pre-tax | [1] | (4) | (73) | (94)
Net unrealized holding gains (losses) |  | 5,103 | (4,343) | (1,497)
Change in funded status of post-retirement health plan, pre-tax |  | (55) | (156) | 20
Net other comprehensive income (loss), pre-tax |  | 5,048 | (4,499) | (1,477)
Unrealized holding (losses) gains on available-for-sale securities during the year, tax |  | (1,788) | 1,494 | 491
Reclassification adjustment for (gains) losses included in net income, tax | [1] | 2 | 26 | 33
Net unrealized (losses) gains on available-for-sale securities, tax |  | (1,786) | 1,520 | 524
Change in funded status of post-retirement health plan, tax |  | 19 | 55 | (7)
Net other comprehensive income (loss), tax |  | (1,767) | 1,575 | 517
Unrealized holding (losses) gains on available-for-sale securities during the year, after-tax |  | 3,319 | (2,776) | (912)
Reclassification adjustment for (gains) losses included in net income, after-tax | [1] | (2) | (47) | (61)
Unrealized holding gains (losses), net of reclassification and tax |  | 3,317 | (2,823) | (973)
Change in funded status of post-retirement health plan, net of tax |  | (36) | (101) | 13
Other comprehensive income (loss), net of tax |  | $ 3,281 | $ (2,924) | $ (960)
[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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