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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Commitments to extend credit [Member]
   
Contractual amount of off-balance-sheet financial instruments    
Contractual amount $ 118,412 $ 117,171
Standby letters of credit [Member]
   
Contractual amount of off-balance-sheet financial instruments    
Contractual amount $ 2,995 $ 2,992