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Off-Balance-Sheet Financial Instruments, Notional Amount (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Commitments to extend credit
   
Derivative [Line Items]    
Notional Amount $ 194,916 $ 154,323
Standby letters of credit
   
Derivative [Line Items]    
Notional Amount 11,321 11,113
Commercial letters of credit
   
Derivative [Line Items]    
Notional Amount $ 8,982 $ 8,991