Loans (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Contracts	Sep. 30, 2011 Contracts	Sep. 30, 2012 Contracts	Sep. 30, 2011 Contracts
Commercial real estate [Member]
Impaired loans classified as troubled debt restructured
Number of Contracts Modified			1	2
Pre-Modification Outstanding Recorded Investment			$ 1,937	$ 923
Post-Modification Outstanding Recorded Investment			1,937	688
Number of Contracts		1		1
Recorded Investment				207
Ag Real Estate [Member]
Impaired loans classified as troubled debt restructured
Number of Contracts Modified
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
Number of Contracts Modified	2		2
Pre-Modification Outstanding Recorded Investment	420		420
Post-Modification Outstanding Recorded Investment	420		420
Number of Contracts
Recorded Investment