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Loans (Details 8) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 Contracts | Mar. 31, 2012 Contracts
Commercial Real Estate [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 |  |
Ag Real Estate [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 | 1 |
Pre- Modification Outstanding Recorded Investment | 81 |
Post- Modification Outstanding Recorded Investment | 43 |
Number of Contracts Modified, Troubled Debt Restructurings That Subsequently Defaulted |  |
Recorded Investment |  |

X
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