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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative Gain Loss On Derivative Net [Abstract]        
Derivative income $ 71 $ 205 $ 309 $ 555