Loans (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012 Contracts	Jun. 30, 2012 Contracts
Commercial real estate [Member]
Impaired loans classified as troubled debt restructured
Number of Contracts Modified	1	1
Pre-Modification Outstanding Recorded Investment	$ 1,937	$ 1,937
Post-Modification Outstanding Recorded Investment	1,937	1,937
Number of Contracts
Recorded Investment
Ag Real Estate [Member]
Impaired loans classified as troubled debt restructured
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Number of Contracts
Recorded Investment
Commercial and industrial [Member]
Impaired loans classified as troubled debt restructured
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Number of Contracts
Recorded Investment