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Derivative Financial Instruments - Schedule of Amounts Related to Interest Rate Derivatives Designated as Hedges of Fair Value (Detail) (Designated as Hedging Instrument [Member], Commercial Loan/Lease Interest Rate Swaps [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Interest Income on Loans [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) included in income $ (623) $ (667)
Other Non-Interest Expense [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) included in income $ 15 $ 12