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Financial Instruments with Off-Balance Sheet Risk (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage loans originated for sale to secondary market investors $ 22,747 $ 13,582
Potential default period after sale of loans to investor 12 months  
Loans held for sale 2,796 2,623
Amount on deposit with correspondent institutions that exceeded insurance limit of FDIC 4  
Commitments to Extend Credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments whose contract amounts represents credit risk 128,162 130,369
Standby Letters of Credit [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments whose contract amounts represents credit risk 12,533 13,206
Mortgage Loans Sold with Potential Recourse [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments whose contract amounts represents credit risk 22,574 13,419
Locked-Rate Commitments [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage loans originated for sale to secondary market investors $ 408