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Short-Term Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Summary of short-term borrowings    
Total $ 4,571 $ 8,274
Weighted average interest rate 0.40% 0.70%
Federal Funds Purchased [Member]
    
Summary of short-term borrowings    
Total 200  
Repurchase Agreements [Member]
    
Summary of short-term borrowings    
Total $ 4,371 $ 8,274
Short-term Debt [Member]
    
Summary of short-term borrowings    
End of period interest rate 0.15% 0.54%