Allowance for Loan Losses - Class of Aging Analysis Recorded Investment in Loans (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 1,564,076	$ 1,594,762
60-89 Days Past Due	605,285	279,792
90 Days Plus Past Due	1,097,085	1,153,386
Total Past Due	3,266,446	3,027,940
Current	178,279,190	173,659,389
Ending balance	181,545,636	176,687,329	186,884,417
Recorded Investment > 90 Days and Accruing	3,115	683,720
30-59 Days Past Due, Percentage	0.86%	0.90%
60-89 Days Past Due, Percentage	0.33%	0.16%
90 Days Plus Past Due, Percentage	0.61%	0.65%
Total Past Due, Percentage	1.80%	1.71%
Current, Percentage	98.20%	98.29%
Total Financing Receivables, Percentage	100.00%	100.00%
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	32,174	73,572
60-89 Days Past Due
90 Days Plus Past Due
Total Past Due	32,174	73,572
Current	4,909,480	4,799,940
Ending balance	4,941,654	4,873,512	5,585,372
Recorded Investment > 90 Days and Accruing
Residential, 1-4 Families [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	424,565	380,731
60-89 Days Past Due	300,806
90 Days Plus Past Due		324,357
Total Past Due	725,371	705,088
Current	37,314,678	35,385,963
Ending balance	38,040,049	36,091,051	36,853,785
Recorded Investment > 90 Days and Accruing		292,583
Nonfarm, Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	383,177	711,408
60-89 Days Past Due	184,056	197,479
90 Days Plus Past Due	437,363	386,160
Total Past Due	1,004,596	1,295,047
Current	60,361,420	47,698,820
Ending balance	61,366,016	48,993,867	48,853,854
Recorded Investment > 90 Days and Accruing
Loans-Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	621,797	256,672
60-89 Days Past Due	66,285	53,391
90 Days Plus Past Due	656,607	429,226
Total Past Due	1,344,689	739,289
Current	65,880,733	75,174,783
Ending balance	67,225,422	75,914,072	84,317,344
Recorded Investment > 90 Days and Accruing		377,494
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	102,363	172,379
60-89 Days Past Due	54,138	28,922
90 Days Plus Past Due	3,115	13,643
Total Past Due	159,616	214,944
Current	5,912,190	6,488,419
Ending balance	6,071,806	6,703,363	7,090,254
Recorded Investment > 90 Days and Accruing	3,115	13,643
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
90 Days Plus Past Due
Total Past Due
Current	3,900,689	4,111,464
Ending balance	3,900,689	4,111,464	4,183,808
Recorded Investment > 90 Days and Accruing
Non Accruals [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	963,519	160,022
60-89 Days Past Due	70,390	89,322
90 Days Plus Past Due	1,093,970	469,666
Total Past Due	2,127,879	719,010
Current	1,748,056	3,021,715
Ending balance	3,875,935	3,740,725
Non Accruals [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		73,572
60-89 Days Past Due
90 Days Plus Past Due
Total Past Due		73,572
Current	71,010	12,995
Ending balance	71,010	86,567
Non Accruals [Member] | Residential, 1-4 Families [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	54,778	84,838
60-89 Days Past Due
90 Days Plus Past Due		31,775
Total Past Due	54,778	116,613
Current	251,538	359,129
Ending balance	306,316	475,742
Non Accruals [Member] | Nonfarm, Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	376,347
60-89 Days Past Due	70,390	89,322
90 Days Plus Past Due	437,363	386,160
Total Past Due	884,100	475,482
Current	1,289,593	1,690,633
Ending balance	2,173,693	2,166,115
Non Accruals [Member] | Loans-Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	530,408
60-89 Days Past Due
90 Days Plus Past Due	656,607	51,731
Total Past Due	1,187,015	51,731
Current	132,977	760,662
Ending balance	1,319,992	812,393
Non Accruals [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,986	1,612
60-89 Days Past Due
90 Days Plus Past Due
Total Past Due	1,986	1,612
Current	2,938	2,306
Ending balance	4,924	3,918
Non Accruals [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due
60-89 Days Past Due
90 Days Plus Past Due
Total Past Due
Current		195,990
Ending balance		$ 195,990