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Loans (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Commercial Real Estate [Member]
Distribution of fixed rate loans and variable rate loans by major loan category
Distribution of fixed rate loans by major loan category, Fixed Rate	$ 118,367
Distribution of variable rate loans by major loan category, Variable Rate	81,632
Agricultural Real Estate [Member]
Distribution of fixed rate loans and variable rate loans by major loan category
Distribution of fixed rate loans by major loan category, Fixed Rate	28,861
Distribution of variable rate loans by major loan category, Variable Rate	11,282
Consumer Real Estate [Member]
Distribution of fixed rate loans and variable rate loans by major loan category
Distribution of fixed rate loans by major loan category, Fixed Rate	65,916
Distribution of variable rate loans by major loan category, Variable Rate	14,371
Commercial and Industrial [Member]
Distribution of fixed rate loans and variable rate loans by major loan category
Distribution of fixed rate loans by major loan category, Fixed Rate	79,493
Distribution of variable rate loans by major loan category, Variable Rate	22,131
Agricultural [Member]
Distribution of fixed rate loans and variable rate loans by major loan category
Distribution of fixed rate loans by major loan category, Fixed Rate	53,429
Distribution of variable rate loans by major loan category, Variable Rate	4,341
Consumer, Master Card and Overdrafts [Member]
Distribution of fixed rate loans and variable rate loans by major loan category
Distribution of fixed rate loans by major loan category, Fixed Rate	15,941
Distribution of variable rate loans by major loan category, Variable Rate	4,472
Industrial Development Bonds [Member]
Distribution of fixed rate loans and variable rate loans by major loan category
Distribution of fixed rate loans by major loan category, Fixed Rate	$ 1,299

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Reflects the carrying amount of loans charging borrowers fixed rates of interest.

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Reflects the carrying amount of loans charging borrowers variable, or adjustable, rates of interest.

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