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Off Balance Sheet Activities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Commitments to extend credit [Member]
   
Outstanding financial instruments whose contract amounts represent credit risk    
Concentration of Risk $ 191,790 $ 146,598
Credit card arrangements [Member]
   
Outstanding financial instruments whose contract amounts represent credit risk    
Concentration of Risk 14,451 14,152
Standby letters of credit [Member]
   
Outstanding financial instruments whose contract amounts represent credit risk    
Concentration of Risk $ 1,470 $ 1,038