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Off Balance Sheet Activities (Tables)
12 Months Ended
Dec. 31, 2012
Off Balance Sheet Activities [Abstract]  
Outstanding financial instruments whose contract amounts represent credit risk
                 
    (In Thousands)  
    2012     2011  

Commitments to extend credit

  $ 191,790     $ 146,598  

Credit card arrangements

    14,451       14,152  

Standby letters of credit

    1,470       1,038