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Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 111,112,000 $ 113,468,000
Unused Lines Of Credit Residential Mortgages [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 56,420,000 59,427,000
Unused lines of Credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 45,747,000 39,313,000
Standby Letters of Credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 2,700,000 2,177,000
Commitments to Extend Credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 6,245,000 $ 12,551,000