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Derivative Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Total notional amount of the Bank's swaps $ 227.1 $ 240.1
Interest-rate swap agreements with customers [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Number of interest-rate swap agreements 85  
Interest-rate swap agreements with counterparty bank [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Number of interest-rate swap agreements 85