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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
NET INCOME |  | $ 22,711 | $ 20,557 | $ 8,055
Other comprehensive income (loss): |  |  |  |
Net unrealized holding gains (losses) on available for sale securities |  | 5,107 | (4,270) | (1,403)
Reclassification adjustment for gains realized in income | [1] | (4) | (73) | (94)
Net unrealized holding gains (losses) |  | 5,103 | (4,343) | (1,497)
Income tax effect |  | (1,786) | 1,520 | 524
Unrealized holding gains (losses), net of reclassification and tax |  | 3,317 | (2,823) | (973)
Change in funded status of post-retirement health plan |  | (55) | (156) | 20
Income tax effect |  | 19 | 55 | (7)
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)
TOTAL COMPREHENSIVE INCOME |  | $ 25,992 | $ 17,633 | $ 7,095
[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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