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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Unrealized gains (losses) during the period, income tax (expense) benefit $ 424 $ 19
Reclassification adjustment for losses realized in net income, income tax benefit $ (15) $ 10