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Loans (Details 8) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Contracts
Dec. 31, 2011
Contracts
Dec. 31, 2012
Contracts
Dec. 31, 2011
Contracts
Commercial Real Estate [Member]
        
Impaired loans classified as troubled debt restructured        
Number of Contracts Modified, Troubled Debt Restructurings       1 2
Pre- Modification Outstanding Recorded Investment       $ 1,937 $ 923
Post- Modification Outstanding Recorded Investment       1,921 702
Number of Contracts Modified, Troubled Debt Restructurings That Subsequently Defaulted          1
Recorded Investment          207
Ag RE [Member]
        
Impaired loans classified as troubled debt restructured        
Number of Contracts Modified, Troubled Debt Restructurings            
Pre- Modification Outstanding Recorded Investment            
Post- Modification Outstanding Recorded Investment            
Number of Contracts Modified, Troubled Debt Restructurings That Subsequently Defaulted            
Recorded Investment            
Commercial and Industrial [Member]
        
Impaired loans classified as troubled debt restructured        
Number of Contracts Modified, Troubled Debt Restructurings       2   
Pre- Modification Outstanding Recorded Investment       420   
Post- Modification Outstanding Recorded Investment       420   
Number of Contracts Modified, Troubled Debt Restructurings That Subsequently Defaulted            
Recorded Investment