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Derivative Financial Instruments - Recognized Derivative Income Included in Other Noninterest Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Derivative Gain Loss On Derivative Net [Abstract]        
Derivative income $ 130 $ 141 $ 238 $ 350