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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement Of Stockholders Equity [Abstract]      
Unrealized gain (loss) on derivative instrument, tax expense (benefit) $ 74 $ 59 $ (164)
Unrealized loss on debt securities net of tax expense (benefit) $ (1,277)