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Derivative Financial Instruments - Recognized Derivative Income Included in Other Noninterest Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Gain Loss On Derivative Net [Abstract]        
Derivative income $ 37 $ 149 $ 192 $ 298