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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

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