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Loans (Details 8) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consumer real estate [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment	$ 964	$ 479	$ 964	$ 479
Unpaid Principal Balance	1,036	492	1,036	492
Related Allowance	69	101	69	101
Average Recorded Investment	974	515	712	593
Interest Income Recognized	3	9	8	14
Consumer real estate [Member] | With no related allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment	573		573
Unpaid Principal Balance	645		645
Related Allowance
Average Recorded Investment	485	133	285	202
Interest Income Recognized	2	7	7	12
Consumer real estate [Member] | With a specific allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment	391	479	391	479
Unpaid Principal Balance	391	492	391	492
Related Allowance	69	101	69	101
Average Recorded Investment	489	382	427	391
Interest Income Recognized	1	2	1	2
Agricultural real estate [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment		223		240
Interest Income Recognized
Agricultural real estate [Member] | With no related allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment		223		240
Interest Income Recognized
Agricultural real estate [Member] | With a specific allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Agriculture [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment		5,036		5,036
Unpaid Principal Balance		5,036		5,036
Related Allowance
Average Recorded Investment		4,768		3,276
Interest Income Recognized		3		3
Agriculture [Member] | With no related allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment		5,036		5,036
Unpaid Principal Balance		5,036		5,036
Related Allowance
Average Recorded Investment		4,768		3,276
Interest Income Recognized		3		3
Agriculture [Member] | With a specific allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Commercial real estate [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment	807	1,567	807	1,567
Unpaid Principal Balance	1,231	1,744	1,231	1,744
Related Allowance
Average Recorded Investment	827	1,821	869	1,721
Interest Income Recognized		9		20
Commercial real estate [Member] | With no related allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment	207	1,567	207	1,567
Unpaid Principal Balance	384	1,744	384	1,744
Related Allowance
Average Recorded Investment	207	1,717	207	1,550
Interest Income Recognized		9		20
Commercial real estate [Member] | With a specific allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment	600		600
Unpaid Principal Balance	847		847
Related Allowance
Average Recorded Investment	620	104	662	171
Interest Income Recognized
Commercial and industrial [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment	2,745		2,745
Unpaid Principal Balance	2,745		2,745
Related Allowance	383		383
Average Recorded Investment	2,745	118	1,507	609
Interest Income Recognized	7
Commercial and industrial [Member] | With no related allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment	365		365
Unpaid Principal Balance	365		365
Related Allowance
Average Recorded Investment	365	118	162	73
Interest Income Recognized
Commercial and industrial [Member] | With a specific allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment	2,380		2,380
Unpaid Principal Balance	2,380		2,380
Related Allowance	383		383
Average Recorded Investment	2,380		1,345	536
Interest Income Recognized	7
Consumer [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment
Unpaid Principal Balance	4		4
Related Allowance
Average Recorded Investment			3	1
Interest Income Recognized			10
Consumer [Member] | With no related allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment
Unpaid Principal Balance	4		4
Related Allowance
Average Recorded Investment				1
Interest Income Recognized
Consumer [Member] | With a specific allowance recorded [Member]
Loans individually evaluated for impairment by class of loans
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment			3
Interest Income Recognized			$ 10

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