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Financial Instruments Represent Off-Balance-Sheet Credit Risk (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Commercial lines of credit
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks $ 8,536 $ 8,539
Commitments to extend credit
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks 313,907 225,400
Standby Letters of Credit
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks $ 6,727 $ 6,690