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Short Term Borrowings (Tables)
 12 Months Ended
Dec. 31, 2012
Short-term Debt:  
Schedule of Short-term Debt [Table Text Block]
 2012  2011  2010
    Weighted     Weighted     Weighted 
(Dollars in thousands) Amount Avg. Rate   Amount Avg. Rate   Amount Avg. Rate 
Federal funds purchased:                 
As of December 31$ —  —  $ —  —  $ —  — 
Average during the year 225 0.96%  6 1.00%  1,125 0.94%
Maximum outstanding at                 
any month-end 1,925      —      —   
                  
Securities sold under                  
agreements to repurchase:                 
As of December 31$2,689 0.50% $2,805 0.50% $2,685 0.50%
Average during the year 2,746 0.50%  2,416 0.50%  2,404 0.50%
Maximum outstanding at                 
any month-end 3,174     2,936     2,858