Loans, Schedule of Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	$ 9,671	$ 10,062
Recorded Investment With No Allowance	5,530	5,729
Recorded Investment With Allowance	2,753	3,152
Total Recorded Investment	8,283	8,881
Related Allowance	562	494
Average Recorded Investment	8,782	9,653
Interest Income Recognized	42	123
Real estate loans [Member] | Residential mortgages [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	258	0
Recorded Investment With No Allowance	118	0
Recorded Investment With Allowance	140	0
Total Recorded Investment	258	0
Related Allowance	14	0
Average Recorded Investment	83	0
Interest Income Recognized	1	0
Real estate loans [Member] | Home equity [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	93	94
Recorded Investment With No Allowance	18	36
Recorded Investment With Allowance	75	58
Total Recorded Investment	93	94
Related Allowance	15	13
Average Recorded Investment	93	36
Interest Income Recognized	2	1
Real estate loans [Member] | Commercial [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	8,816	9,394
Recorded Investment With No Allowance	5,366	5,663
Recorded Investment With Allowance	2,109	2,607
Total Recorded Investment	7,475	8,270
Related Allowance	512	433
Average Recorded Investment	8,138	8,585
Interest Income Recognized	39	65
Real estate loans [Member] | Agricultural [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	0	0
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	0	0
Total Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	371
Interest Income Recognized	0	37
Real estate loans [Member] | Construction [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	0	0
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	0	0
Total Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Consumer [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	0	0
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	0	0
Total Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Other commercial [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	504	574
Recorded Investment With No Allowance	28	30
Recorded Investment With Allowance	429	487
Total Recorded Investment	457	517
Related Allowance	21	48
Average Recorded Investment	468	501
Interest Income Recognized	0	0
Other agricultural loans [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	0	0
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	0	0
Total Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	160
Interest Income Recognized	0	20
State and political subdivision loans [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	0	0
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	0	0
Total Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	$ 0	$ 0