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Off Balance Sheet Activities - Outstanding Financial Instruments Whose Contract Amounts Represent Credit Risk (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Commitments to extend credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Concentration of Risk $ 201,891 $ 191,790
Credit card arrangements [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Concentration of Risk 14,818 14,451
Standby letters of credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Concentration of Risk $ 1,567 $ 1,470