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Derivative Financial Instruments - Recognized Derivative Income Included in Other Noninterest Income (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Gain Loss On Derivative Net [Abstract]      
Derivative income $ 521 $ 599 $ 569