Allowance for Loan Losses - Impaired Loans Individually Evaluated by Class of Loan (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded Investment With no related allowance	$ 3,307,919	$ 3,321,347
Unpaid Principal Balance With no related allowance	3,564,043	3,495,835
Average Recorded Investment With no related allowance	3,531,366	3,284,150
Interest Income Recognized With no related allowance	97,949	191,656
Recorded Investment With an allowance	2,522,193	2,805,148
Unpaid Principal Balance With an allowance	2,544,024	2,826,979
Related Allowance	380,819	515,109
Average Recorded Investment With an allowance	2,627,483	2,819,796
Interest Income Recognized With an allowance	23,882	110,025
Recorded Investment Combined	5,830,112	6,126,495
Unpaid Principal Balance Combined	6,108,067	6,322,814
Related Allowance Combined	380,819	515,109
Average Recorded Investment Combined	6,158,849	6,103,946
Interest Income Recognized Combined	121,831	301,681
Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With no related allowance	85,562	86,567
Unpaid Principal Balance With no related allowance	85,562	86,567
Average Recorded Investment With no related allowance	87,038	87,668
Interest Income Recognized With no related allowance	4,033	4,898
Recorded Investment With an allowance
Unpaid Principal Balance With an allowance
Related Allowance
Average Recorded Investment With an allowance
Interest Income Recognized With an allowance
Recorded Investment Combined	85,562	86,567
Unpaid Principal Balance Combined	85,562	86,567
Related Allowance Combined
Average Recorded Investment Combined	87,038	87,668
Interest Income Recognized Combined	4,033	4,898
Residential, 1-4 Families [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With no related allowance	254,777	284,884
Unpaid Principal Balance With no related allowance	254,777	284,884
Average Recorded Investment With no related allowance	272,985	287,802
Interest Income Recognized With no related allowance	2,003	19,798
Recorded Investment With an allowance	75,422
Unpaid Principal Balance With an allowance	75,422
Related Allowance	11,652
Average Recorded Investment With an allowance	79,601
Interest Income Recognized With an allowance	1,275
Recorded Investment Combined	330,199	284,884
Unpaid Principal Balance Combined	330,199	284,884
Related Allowance Combined	11,652
Average Recorded Investment Combined	352,586	287,802
Interest Income Recognized Combined	3,278	19,798
Nonfarm, Nonresidential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With no related allowance	1,660,595	1,381,111
Unpaid Principal Balance With no related allowance	1,742,231	1,381,111
Average Recorded Investment With no related allowance	1,830,858	1,396,123
Interest Income Recognized With no related allowance	41,522	81,741
Recorded Investment With an allowance	1,468,268	1,804,769
Unpaid Principal Balance With an allowance	1,490,099	1,826,600
Related Allowance	201,637	319,699
Average Recorded Investment With an allowance	1,536,258	1,813,156
Interest Income Recognized With an allowance	11,006	70,705
Recorded Investment Combined	3,128,863	3,185,880
Unpaid Principal Balance Combined	3,232,330	3,207,711
Related Allowance Combined	201,637	319,699
Average Recorded Investment Combined	3,367,116	3,209,279
Interest Income Recognized Combined	52,528	152,446
Loans-Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With no related allowance	1,306,985	1,372,796
Unpaid Principal Balance With no related allowance	1,481,473	1,547,284
Average Recorded Investment With no related allowance	1,340,485	1,312,662
Interest Income Recognized With no related allowance	50,391	67,194
Recorded Investment With an allowance	978,503	1,000,379
Unpaid Principal Balance With an allowance	978,503	1,000,379
Related Allowance	167,530	195,410
Average Recorded Investment With an allowance	1,011,624	1,006,640
Interest Income Recognized With an allowance	11,601	39,320
Recorded Investment Combined	2,285,488	2,373,175
Unpaid Principal Balance Combined	2,459,976	2,547,663
Related Allowance Combined	167,530	195,410
Average Recorded Investment Combined	2,352,109	2,319,302
Interest Income Recognized Combined	61,992	106,514
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With no related allowance
Unpaid Principal Balance With no related allowance
Average Recorded Investment With no related allowance
Interest Income Recognized With no related allowance
Recorded Investment With an allowance
Unpaid Principal Balance With an allowance
Related Allowance
Average Recorded Investment With an allowance
Interest Income Recognized With an allowance
Recorded Investment Combined
Unpaid Principal Balance Combined
Related Allowance Combined
Average Recorded Investment Combined
Interest Income Recognized Combined
Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With no related allowance		195,989
Unpaid Principal Balance With no related allowance		195,989
Average Recorded Investment With no related allowance		199,895
Interest Income Recognized With no related allowance		18,025
Recorded Investment With an allowance
Unpaid Principal Balance With an allowance
Related Allowance
Average Recorded Investment With an allowance
Interest Income Recognized With an allowance
Recorded Investment Combined		195,989
Unpaid Principal Balance Combined		195,989
Related Allowance Combined
Average Recorded Investment Combined		199,895
Interest Income Recognized Combined		$ 18,025