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Loans (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Recorded investment in nonaccrual loans by portfolio segment of loans
Investment in nonaccrual loans	$ 4,582	$ 4,828	$ 2,923
Consumer real estate [Member]
Recorded investment in nonaccrual loans by portfolio segment of loans
Investment in nonaccrual loans	689	964
Agricultural Real Estate [Member]
Recorded investment in nonaccrual loans by portfolio segment of loans
Investment in nonaccrual loans
Agricultural [Member]
Recorded investment in nonaccrual loans by portfolio segment of loans
Investment in nonaccrual loans		0
Commercial Real Estate [Member]
Recorded investment in nonaccrual loans by portfolio segment of loans
Investment in nonaccrual loans	944	877
Commercial and Industrial [Member]
Recorded investment in nonaccrual loans by portfolio segment of loans
Investment in nonaccrual loans	2,949	2,987
Consumer [Member]
Recorded investment in nonaccrual loans by portfolio segment of loans
Investment in nonaccrual loans

X

- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524

+ Details

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Period Type:	instant