Loans (Details 5) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Risk category of loans
Loans - Gross	$ 498,482	$ 506,402
Agricultural Real Estate [Member]
Risk category of loans
Loans - Gross	32,408	31,993
Agricultural Real Estate [Member] \| 1-2 [Member]
Risk category of loans
Loans - Gross	1,318	1,059
Agricultural Real Estate [Member] \| 3 [Member]
Risk category of loans
Loans - Gross	11,634	12,613
Agricultural Real Estate [Member] \| 4 [Member]
Risk category of loans
Loans - Gross	18,890	17,255
Agricultural Real Estate [Member] \| 5 [Member]
Risk category of loans
Loans - Gross	376	383
Agricultural Real Estate [Member] \| 6 [Member]
Risk category of loans
Loans - Gross	190	683
Agricultural Real Estate [Member] \| 7 [Member]
Risk category of loans
Loans - Gross
Agricultural Real Estate [Member] \| 8 [Member]
Risk category of loans
Loans - Gross
Agricultural [Member]
Risk category of loans
Loans - Gross	54,808	52,598
Agricultural [Member] \| 1-2 [Member]
Risk category of loans
Loans - Gross	2,337	1,500
Agricultural [Member] \| 3 [Member]
Risk category of loans
Loans - Gross	23,987	25,019
Agricultural [Member] \| 4 [Member]
Risk category of loans
Loans - Gross	28,432	26,008
Agricultural [Member] \| 5 [Member]
Risk category of loans
Loans - Gross	52	57
Agricultural [Member] \| 6 [Member]
Risk category of loans
Loans - Gross		7
Agricultural [Member] \| 7 [Member]
Risk category of loans
Loans - Gross		7
Agricultural [Member] \| 8 [Member]
Risk category of loans
Loans - Gross
Commercial real estate [Member]
Risk category of loans
Loans - Gross	202,900	201,158
Commercial real estate [Member] \| 1-2 [Member]
Risk category of loans
Loans - Gross	4,111	3,545
Commercial real estate [Member] \| 3 [Member]
Risk category of loans
Loans - Gross	30,669	23,346
Commercial real estate [Member] \| 4 [Member]
Risk category of loans
Loans - Gross	153,615	162,788
Commercial real estate [Member] \| 5 [Member]
Risk category of loans
Loans - Gross	6,403	6,098
Commercial real estate [Member] \| 6 [Member]
Risk category of loans
Loans - Gross	7,502	4,677
Commercial real estate [Member] \| 7 [Member]
Risk category of loans
Loans - Gross	600	704
Commercial real estate [Member] \| 8 [Member]
Risk category of loans
Loans - Gross
Commercial and industrial [Member]
Risk category of loans
Loans - Gross	104,224	114,497
Commercial and industrial [Member] \| 1-2 [Member]
Risk category of loans
Loans - Gross	942	710
Commercial and industrial [Member] \| 3 [Member]
Risk category of loans
Loans - Gross	25,844	22,506
Commercial and industrial [Member] \| 4 [Member]
Risk category of loans
Loans - Gross	69,427	82,745
Commercial and industrial [Member] \| 5 [Member]
Risk category of loans
Loans - Gross	3,963	3,897
Commercial and industrial [Member] \| 6 [Member]
Risk category of loans
Loans - Gross	1,608	4,219
Commercial and industrial [Member] \| 7 [Member]
Risk category of loans
Loans - Gross	2,440	420
Commercial and industrial [Member] \| 8 [Member]
Risk category of loans
Loans - Gross
Industrial Development Bonds [Member]
Risk category of loans
Loans - Gross	1,199	1,196
Industrial Development Bonds [Member] \| 1-2 [Member]
Risk category of loans
Loans - Gross	188	188
Industrial Development Bonds [Member] \| 3 [Member]
Risk category of loans
Loans - Gross	623	622
Industrial Development Bonds [Member] \| 4 [Member]
Risk category of loans
Loans - Gross	388	386
Industrial Development Bonds [Member] \| 5 [Member]
Risk category of loans
Loans - Gross
Industrial Development Bonds [Member] \| 6 [Member]
Risk category of loans
Loans - Gross
Industrial Development Bonds [Member] \| 7 [Member]
Risk category of loans
Loans - Gross
Industrial Development Bonds [Member] \| 8 [Member]
Risk category of loans
Loans - Gross
Consumer [Member]
Risk category of loans
Loans - Gross	$ 21,691	$ 23,375