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Financial Instruments Representing Off-Balance-Sheet Credit Risk (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Commitments to extend credit
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks $ 194,916 $ 154,323
Standby letters of credit
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks 11,321 11,113
Commercial letters of credit
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks $ 8,982 $ 8,991