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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Unrealized holding gains (losses) during the period, income taxes $ 1 $ 457 $ 822
Reclassification adjustment for losses realized in net income, income taxes $ (99) $ (201) $ (76)