Loans (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Investment in impaired loans
Recorded Investment	$ 15,576,000		$ 15,576,000		$ 17,312,000
Unpaid Principal Balance	21,098,000		21,098,000		24,271,000
Impaired Loans With Specific Allowance	11,355,000		11,355,000		10,177,000
Impaired Loans Without Specific Allowance	4,221,000		4,221,000		7,135,000
Specific Allowance for Impaired Loans	6,825,000		6,825,000		6,061,000
Average Recorded Investment	14,750,000	19,609,000	15,093,000	17,939,000
Interest Income Recognized	12,000		15,000	4,000
Increase in interest income if interest on non-accruing loans had been recognized at original interest rates stipulated in the respective loan agreements	200,000	300,000	600,000	1,000,000
Real Estate Secured | Residential 1 to 4 family
Investment in impaired loans
Recorded Investment	812,000		812,000		831,000
Unpaid Principal Balance	965,000		965,000		1,035,000
Impaired Loans With Specific Allowance	109,000		109,000		246,000
Impaired Loans Without Specific Allowance	703,000		703,000		585,000
Specific Allowance for Impaired Loans	17,000		17,000		18,000
Average Recorded Investment	783,000	801,000	750,000	756,000
Real Estate Secured | Home equity lines of credit
Investment in impaired loans
Recorded Investment					58,000
Unpaid Principal Balance					152,000
Impaired Loans With Specific Allowance					58,000
Specific Allowance for Impaired Loans					7,000
Average Recorded Investment	28,000	384,000	43,000	378,000
Real Estate Secured | Commercial
Investment in impaired loans
Recorded Investment	1,194,000		1,194,000		933,000
Unpaid Principal Balance	1,925,000		1,925,000		1,799,000
Impaired Loans With Specific Allowance	642,000		642,000		42,000
Impaired Loans Without Specific Allowance	552,000		552,000		891,000
Specific Allowance for Impaired Loans	91,000		91,000
Average Recorded Investment	745,000	3,492,000	781,000	3,757,000
Real Estate Secured | Farmland
Investment in impaired loans
Recorded Investment					1,077,000
Unpaid Principal Balance					1,089,000
Impaired Loans Without Specific Allowance					1,077,000
Average Recorded Investment		363,000	269,000	272,000
Commercial | Commercial and industrial
Investment in impaired loans
Recorded Investment	4,671,000		4,671,000		4,337,000
Unpaid Principal Balance	5,196,000		5,196,000		4,813,000
Impaired Loans With Specific Allowance	3,463,000		3,463,000		3,410,000
Impaired Loans Without Specific Allowance	1,208,000		1,208,000		927,000
Specific Allowance for Impaired Loans	2,826,000		2,826,000		2,172,000
Average Recorded Investment	4,342,000	4,129,000	4,223,000	3,644,000
Interest Income Recognized	8,000		11,000	4,000
Commercial | Agriculture
Investment in impaired loans
Recorded Investment	810,000		810,000		907,000
Unpaid Principal Balance	848,000		848,000		1,235,000
Impaired Loans With Specific Allowance	65,000		65,000		30,000
Impaired Loans Without Specific Allowance	745,000		745,000		877,000
Specific Allowance for Impaired Loans	27,000		27,000		13,000
Average Recorded Investment	1,064,000	1,905,000	966,000	2,010,000
Construction | Single family residential
Investment in impaired loans
Average Recorded Investment				234,000
Construction | Commercial
Investment in impaired loans
Recorded Investment					1,380,000
Unpaid Principal Balance					2,508,000
Impaired Loans Without Specific Allowance					1,380,000
Average Recorded Investment		1,257,000	345,000	943,000
Land
Investment in impaired loans
Recorded Investment	8,063,000		8,063,000		7,504,000
Unpaid Principal Balance	12,093,000		12,093,000		11,307,000
Impaired Loans With Specific Allowance	7,050,000		7,050,000		6,106,000
Impaired Loans Without Specific Allowance	1,013,000		1,013,000		1,398,000
Specific Allowance for Impaired Loans	3,854,000		3,854,000		3,829,000
Average Recorded Investment	7,760,000	7,189,000	7,605,000	5,863,000
Interest Income Recognized	4,000		4,000
Installment loans to individuals
Investment in impaired loans
Recorded Investment	26,000		26,000		285,000
Unpaid Principal Balance	71,000		71,000		333,000
Impaired Loans With Specific Allowance	26,000		26,000		285,000
Specific Allowance for Impaired Loans	10,000		10,000		22,000
Average Recorded Investment	$ 28,000	$ 89,000	$ 111,000	$ 82,000