Credit Quality of Loans and Allowance for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Summarize the past due loans by category
30-59 Days Past Due	$ 2,942	$ 4,220
60-89 Days Past Due	666	1,193
Greater than 90 Days	14,342	12,093
Total Past Due	17,950	17,506
Current	488,307	479,036
Gross loans	506,257	496,542	542,687
Real Estate Construction and Land Development Loans [Member]
Summarize the past due loans by category
30-59 Days Past Due	178	447
60-89 Days Past Due	76	198
Greater than 90 Days	5,271	6,142
Total Past Due	5,525	6,787
Current	57,419	60,340
Gross loans	62,944	67,127	84,291
Real Estate Secured by Farmland [Member]
Summarize the past due loans by category
30-59 Days Past Due
60-89 Days Past Due	156
Greater than 90 Days	200
Total Past Due	356
Current	27,271	29,890
Gross loans	27,627	29,890	33,641
Real Estate Secured by Residential Properties [Member]
Summarize the past due loans by category
30-59 Days Past Due	211	1,055
60-89 Days Past Due	222	993
Greater than 90 Days	2,312	1,278
Total Past Due	2,745	3,326
Current	104,950	107,048
Gross loans	107,695	110,374	117,458
Real Estate Secured by Nonfarm Nonresidential [Member]
Summarize the past due loans by category
30-59 Days Past Due	2,430	2,357
60-89 Days Past Due	210
Greater than 90 Days	6,401	4,446
Total Past Due	9,041	6,803
Current	188,966	196,260
Gross loans	198,007	203,063	211,556
Consumer Installment [Member]
Summarize the past due loans by category
30-59 Days Past Due	20	65
60-89 Days Past Due	2
Greater than 90 Days	7	22
Total Past Due	29	87
Current	6,131	6,533
Gross loans	6,160	6,620	5,191
Credit Cards and Related Plans [Member]
Summarize the past due loans by category
30-59 Days Past Due	2	2
60-89 Days Past Due		2
Greater than 90 Days
Total Past Due	2	4
Current	1,721	1,657
Gross loans	1,723	1,661	2,422
Commercial and Industrial [Member]
Summarize the past due loans by category
30-59 Days Past Due	101	294
60-89 Days Past Due
Greater than 90 Days	151	205
Total Past Due	252	499
Current	54,753	45,180
Gross loans	55,005	45,679	47,780
Loans to Finance Agricultural Production [Member]
Summarize the past due loans by category
30-59 Days Past Due
60-89 Days Past Due
Greater than 90 Days
Total Past Due
Current	36,856	21,539
Gross loans	36,856	21,539	23,715
All Other Loans [Member]
Summarize the past due loans by category
30-59 Days Past Due
60-89 Days Past Due
Greater than 90 Days
Total Past Due
Current	10,240	10,589
Gross loans	10,240	10,589	16,633
Non-Accrual Loans Included in above Total [Member]
Summarize the past due loans by category
30-59 Days Past Due	1,941	1,426
60-89 Days Past Due	529	588
Greater than 90 Days	14,342	12,093
Total Past Due	16,812	14,107
Current	1,392	1,866
Gross loans	$ 18,204	$ 15,973