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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]      
NET INCOME $ 32,569 $ 22,711 $ 20,557
Other comprehensive income:      
Net unrealized holding gains (losses) on available for sale securities (5,343) 5,107 (4,270)
Reclassification adjustment for (gains) losses realized in income [1] (283) (4) (73)
Net unrealized holding gains (losses) (5,626) 5,103 (4,343)
Income tax effect 1,169 (1,786) 1,520
Unrealized holding gains (losses), net of reclassification and tax (4,457) 3,317 (2,823)
Change in funded status of post-retirement health plan 0 (55) (156)
Income tax effect 0 19 55
Change in funded status of post-retirement health plan, net of tax 0 (36) (101)
Other comprehensive income (loss), net of tax (4,457) 3,281 (2,924)
TOTAL COMPREHENSIVE INCOME $ 28,112 $ 25,992 $ 17,633
[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.