Loans (Details 6) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
30-59 Days	$ 2,346	$ 2,605
60-89 Days	610	238
90+ Days	4,650	4,819
Total Past Due	7,606	7,662
Current	477,585	437,639
Total Loans	485,191	445,301
90+ And Accruing
Commercial and Industrial
30-59 Days	375	670
60-89 Days	83	25
90+ Days	1,795	2,041
Total Past Due	2,253	2,736
Current	111,990	114,686
Total Loans	114,243	117,422
90+ And Accruing
Agricultural
30-59 Days
60-89 Days	154
90+ Days
Total Past Due	154
Current	4,111	1,957
Total Loans	4,265	1,957
90+ And Accruing
Government
30-59 Days
60-89 Days
90+ Days
Total Past Due
Current	14,125	7,813
Total Loans	14,125	7,813
90+ And Accruing
Commercial Real Estate
30-59 Days	936	542
60-89 Days	76
90+ Days	1,028	1,229
Total Past Due	2,040	1,771
Current	181,778	182,589
Total Loans	183,818	184,360
90+ And Accruing
Commercial Construction and Development
30-59 Days
60-89 Days	20
90+ Days		145
Total Past Due	20	145
Current	25,340	17,195
Total Loans	25,360	17,340
90+ And Accruing
Residential Prime
30-59 Days	950	1,127
60-89 Days	274	173
90+ Days	1,344	1,144
Total Past Due	2,568	2,444
Current	103,011	75,670
Total Loans	105,579	78,114
90+ And Accruing
Residential Heloc
30-59 Days	64	255
60-89 Days		5
90+ Days	335	129
Total Past Due	399	389
Current	21,357	22,804
Total Loans	21,756	23,193
90+ And Accruing
Construction and Development
30-59 Days
60-89 Days		35
90+ Days	133	77
Total Past Due	133	112
Current	11,197	11,258
Total Loans	11,330	11,370
90+ And Accruing
Consumer Loan
30-59 Days	21	11
60-89 Days	3	0
90+ Days	15	54
Total Past Due	39	65
Current	4,676	3,667
Total Loans	4,715	3,732
90+ And Accruing