Financial Instruments with Off Balance Sheet Risk - Schedule of Bank's Exposure to Credit Loss (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract or Notional Amount $ 46,840 $ 36,407
Commitments to Grant Loans [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract or Notional Amount 17,060 13,262
Unfunded Commitments of Existing Loans [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract or Notional Amount 26,785 21,396
Standby and Performance Letters of Credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract or Notional Amount $ 2,995 $ 1,749