Loans, Schedule of Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	$ 9,652	$ 10,062
Recorded Investment With No Allowance	5,380	5,729
Recorded Investment With Allowance	2,770	3,152
Total Recorded Investment	8,150	8,881
Related Allowance	524	494
Average Recorded Investment	8,569	9,653
Interest Income Recognized	79	123
Real estate loans [Member] | Residential mortgages [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	272	0
Recorded Investment With No Allowance	116	0
Recorded Investment With Allowance	135	0
Total Recorded Investment	251	0
Related Allowance	8	0
Average Recorded Investment	139	0
Interest Income Recognized	2	0
Real estate loans [Member] | Home equity [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	156	94
Recorded Investment With No Allowance	18	36
Recorded Investment With Allowance	139	58
Total Recorded Investment	157	94
Related Allowance	14	13
Average Recorded Investment	100	36
Interest Income Recognized	3	1
Real estate loans [Member] | Commercial [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	8,840	9,394
Recorded Investment With No Allowance	5,218	5,663
Recorded Investment With Allowance	2,187	2,607
Total Recorded Investment	7,405	8,270
Related Allowance	501	433
Average Recorded Investment	7,891	8,585
Interest Income Recognized	74	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	384	574
Recorded Investment With No Allowance	28	30
Recorded Investment With Allowance	309	487
Total Recorded Investment	337	517
Related Allowance	1	48
Average Recorded Investment	439	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