Allowance for Loan Losses, Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
With no related allowance recorded [Abstract]
Recorded Investment	$ 3,355	$ 3,768	$ 3,355	$ 3,768	$ 4,648
Unpaid Principal Balance	3,719	3,925	3,719	3,925	4,913
Related Allowance	0	0	0	0	0
Average Recorded Investment	3,524	3,195	3,863	3,202	3,645
Interest Income Recognized	21	1	32	1	25
With an allowance recorded [Abstract]
Recorded Investment	1,039	8,058	1,039	8,058	4,334
Unpaid Principal Balance	2,031	10,400	2,031	10,400	5,056
Related Allowance	915	1,389	915	1,389	1,636
Average Recorded Investment	1,153	4,977	1,979	3,808	4,896
Interest Income Recognized	1	12	2	12	116
Recorded Investment, Total	4,394	11,826	4,394	11,826	8,982
Unpaid Principal Balance, Total	5,750	14,325	5,750	14,325	9,969
Related Allowance, Total	915	1,389	915	1,389	1,636
Average Recorded Investment, Total	4,677	8,172	5,842	7,010	8,541
Interest Income Recognized, Total	22	13	34	13	141
Commercial Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded Investment	298	244	298	244	1,555
Unpaid Principal Balance	299	264	299	264	1,547
Related Allowance	0	0	0	0	0
Average Recorded Investment	720	272	1,035	465	729
Interest Income Recognized	6	0	9	0	0
With an allowance recorded [Abstract]
Recorded Investment	0	3,048	0	3,048	3,017
Unpaid Principal Balance	0	3,046	0	3,046	3,015
Related Allowance	0	500	0	500	686
Average Recorded Investment	0	1,537	755	1,174	2,281
Interest Income Recognized	0	2	0	2	89
Agricultural Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded Investment	1,514	2,499	1,514	2,499	955
Unpaid Principal Balance	1,777	2,499	1,777	2,499	974
Related Allowance	0	0	0	0	0
Average Recorded Investment	1,224	1,737	1,085	1,356	1,341
Interest Income Recognized	0	0	0	0	0
With an allowance recorded [Abstract]
Recorded Investment		826		826	0
Unpaid Principal Balance		822		822	0
Related Allowance		400		400	0
Average Recorded Investment		826		826	529
Interest Income Recognized		0		0	0
Residential 1st Mortgages [Member]
With no related allowance recorded [Abstract]
Recorded Investment	387	443	387	443	1,219
Unpaid Principal Balance	416	579	416	579	1,272
Related Allowance	0	0	0	0	0
Average Recorded Investment	340	624	549	897	936
Interest Income Recognized	0	1	0	1	13
With an allowance recorded [Abstract]
Recorded Investment	108		108
Unpaid Principal Balance	109		109
Related Allowance	51		51
Average Recorded Investment	108		81
Interest Income Recognized	0		0
Home Equity Lines and Loans [Member]
With no related allowance recorded [Abstract]
Recorded Investment	750	246	750	246	469
Unpaid Principal Balance	821	246	821	246	484
Related Allowance	0	0	0	0	0
Average Recorded Investment	762	251	704	192	290
Interest Income Recognized	7	0	11	0	2
With an allowance recorded [Abstract]
Recorded Investment	78	74	78	74	113
Unpaid Principal Balance	82	83	82	83	119
Related Allowance	60	40	60	40	80
Average Recorded Investment	133	141	142	158	117
Interest Income Recognized	1	1	2	1	2
Agricultural [Member]
With no related allowance recorded [Abstract]
Recorded Investment	288	146	288	146	262
Unpaid Principal Balance	288	146	288	146	372
Related Allowance	0	0	0	0	0
Average Recorded Investment	299	97	293	65	149
Interest Income Recognized	6	0	10	0	9
With an allowance recorded [Abstract]
Recorded Investment	587	3,931	587	3,931	1,076
Unpaid Principal Balance	1,566	6,245	1,566	6,245	1,791
Related Allowance	586	350	586	350	793
Average Recorded Investment	717	2,331	840	1,532	1,818
Interest Income Recognized	0	9	0	9	25
Commercial [Member]
With no related allowance recorded [Abstract]
Recorded Investment	118	190	118	190	188
Unpaid Principal Balance	118	191	118	191	264
Related Allowance	0	0	0	0	0
Average Recorded Investment	179	203	197	214	195
Interest Income Recognized	2	0	2	0	1
With an allowance recorded [Abstract]
Recorded Investment	245	141	245	141	104
Unpaid Principal Balance	252	141	252	141	107
Related Allowance	197	65	197	65	54
Average Recorded Investment	173	104	138	86	120
Interest Income Recognized	0	0	0	0	0
Consumer & Other [Member]
With no related allowance recorded [Abstract]
Recorded Investment		0		0	0
Unpaid Principal Balance		0		0	0
Related Allowance		0		0	0
Average Recorded Investment		11		13	5
Interest Income Recognized		0		0	0
With an allowance recorded [Abstract]
Recorded Investment	21	38	21	38	24
Unpaid Principal Balance	22	63	22	63	24
Related Allowance	21	34	21	34	23
Average Recorded Investment	22	38	23	32	31
Interest Income Recognized	$ 0	$ 0	$ 0	$ 0	$ 0