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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 |  |  |  |

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