Loans (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Risk category of loans
Loans - Gross	$ 491,418	$ 506,402
Agricultural real estate [Member]
Risk category of loans
Loans - Gross	32,221	31,993
Agricultural real estate [Member] \| 1-2 [Member]
Risk category of loans
Loans - Gross	1,800	1,059
Agricultural real estate [Member] \| 3 [Member]
Risk category of loans
Loans - Gross	11,279	12,613
Agricultural real estate [Member] \| 4 [Member]
Risk category of loans
Loans - Gross	18,426	17,255
Agricultural real estate [Member] \| 5 [Member]
Risk category of loans
Loans - Gross	661	383
Agricultural real estate [Member] \| 6 [Member]
Risk category of loans
Loans - Gross	55	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	56,581	52,598
Agricultural [Member] \| 1-2 [Member]
Risk category of loans
Loans - Gross	2,696	1,500
Agricultural [Member] \| 3 [Member]
Risk category of loans
Loans - Gross	20,389	25,019
Agricultural [Member] \| 4 [Member]
Risk category of loans
Loans - Gross	33,453	26,008
Agricultural [Member] \| 5 [Member]
Risk category of loans
Loans - Gross	43	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	198,856	201,158
Commercial real estate [Member] \| 1-2 [Member]
Risk category of loans
Loans - Gross	4,018	3,545
Commercial real estate [Member] \| 3 [Member]
Risk category of loans
Loans - Gross	36,049	23,346
Commercial real estate [Member] \| 4 [Member]
Risk category of loans
Loans - Gross	143,015	162,788
Commercial real estate [Member] \| 5 [Member]
Risk category of loans
Loans - Gross	6,199	6,098
Commercial real estate [Member] \| 6 [Member]
Risk category of loans
Loans - Gross	8,975	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	100,126	114,497
Commercial and industrial [Member] \| 1-2 [Member]
Risk category of loans
Loans - Gross	967	710
Commercial and industrial [Member] \| 3 [Member]
Risk category of loans
Loans - Gross	23,919	22,506
Commercial and industrial [Member] \| 4 [Member]
Risk category of loans
Loans - Gross	66,567	82,745
Commercial and industrial [Member] \| 5 [Member]
Risk category of loans
Loans - Gross	4,055	3,897
Commercial and industrial [Member] \| 6 [Member]
Risk category of loans
Loans - Gross	2,238	4,219
Commercial and industrial [Member] \| 7 [Member]
Risk category of loans
Loans - Gross	2,380	420
Commercial and industrial [Member] \| 8 [Member]
Risk category of loans
Loans - Gross
Industrial Development Bonds [Member]
Risk category of loans
Loans - Gross	1,427	1,196
Industrial Development Bonds [Member] \| 1-2 [Member]
Risk category of loans
Loans - Gross	97	188
Industrial Development Bonds [Member] \| 3 [Member]
Risk category of loans
Loans - Gross	942	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