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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Unrealized losses on available-for-sale securities, taxes $ 30 $ 10 $ 38 $ 232
Unrealized losses on hedging derivatives, taxes $ 26 $ 42 $ 83 $ 45