Loans, Credit Quality Indicator (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 736,820,000	$ 747,050,000	$ 706,513,000
Loan balance for reviewing high risk loans minimum	250,000	50,000
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	52,906,000	55,684,000
Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,856,000	6,211,000	8,848,000
Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	52,094,000	53,808,000	56,420,000
Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,570,000	5,852,000	3,224,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	328,852,000	334,386,000	300,389,000
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	204,658,000	203,845,000
Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	48,208,000	49,057,000	48,008,000
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	28,379,000	29,778,000
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,297,000	8,429,000
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	669,355,000	663,238,000
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	47,848,000	49,947,000
Pass [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,775,000	6,156,000
Pass [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	39,650,000	37,256,000
Pass [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,401,000	5,749,000
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	302,856,000	298,222,000
Pass [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	185,951,000	183,222,000
Pass [Member] | Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	44,378,000	45,495,000
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	27,267,000	28,840,000
Pass [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,229,000	8,351,000
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	24,807,000	25,573,000
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,821,000	1,418,000
Special Mention [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	16,000	0
Special Mention [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,965,000	1,664,000
Special Mention [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	169,000	103,000
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	9,062,000	9,759,000
Special Mention [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,126,000	11,413,000
Special Mention [Member] | Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,278,000	914,000
Special Mention [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	366,000	293,000
Special Mention [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,000	9,000
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	42,658,000	58,239,000
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,237,000	4,319,000
Substandard [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	65,000	55,000
Substandard [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,479,000	14,888,000
Substandard [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	16,934,000	26,405,000
Substandard [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	8,581,000	9,210,000
Substandard [Member] | Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,552,000	2,648,000
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	746,000	645,000
Substandard [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 64,000	$ 69,000