Allowance for Loan Losses - Loans by Credit Quality Indicator (Detail) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

$ 181,545,636

$ 176,687,329

$ 186,884,417

Guaranteed portion of loans

45,276,337

43,118,330

Financing Receivable, Aggregate Rate

100.00%

Construction and Land Development [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

4,941,654

4,873,512

5,585,372

Guaranteed portion of loans

16,268

Residential, 1-4 Families [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

38,040,049

36,091,051

36,853,785

Guaranteed portion of loans

707,922

752,677

Nonfarm, Nonresidential [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

61,366,016

48,993,867

48,853,854

Guaranteed portion of loans

27,167,833

19,855,775

Loans-Commercial and Industrial [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

67,225,422

75,914,072

84,317,344

Guaranteed portion of loans

16,885,330

22,001,515

Consumer [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

6,071,806

6,703,363

7,090,254

Guaranteed portion of loans

Other [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

3,900,689

4,111,464

4,183,808

Guaranteed portion of loans

498,984

508,363

Pass Credits [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

177,592,976

173,533,614

Guaranteed portion of loans

43,447,050

42,270,235

Financing Receivable, Aggregate Rate

97.80%

98.20%

Pass Credits [Member] | Construction and Land Development [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

4,870,644

4,786,945

Guaranteed portion of loans

16,268

Pass Credits [Member] | Residential, 1-4 Families [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

37,732,683

35,755,061

Guaranteed portion of loans

662,783

752,677

Pass Credits [Member] | Nonfarm, Nonresidential [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

59,047,105

47,500,758

Guaranteed portion of loans

26,250,602

19,654,773

Pass Credits [Member] | Loans-Commercial and Industrial [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

65,970,308

74,878,901

Guaranteed portion of loans

16,018,413

21,354,422

Pass Credits [Member] | Consumer [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

6,071,547

6,696,475

Guaranteed portion of loans

Pass Credits [Member] | Other [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

3,900,689

3,915,474

Guaranteed portion of loans

498,984

508,363

Special Mention [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

3,775,383

2,890,881

Guaranteed portion of loans

1,766,721

848,095

Financing Receivable, Aggregate Rate

2.10%

1.60%

Special Mention [Member] | Construction and Land Development [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

71,010

86,567

Guaranteed portion of loans

Special Mention [Member] | Residential, 1-4 Families [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

307,366

335,990

Guaranteed portion of loans

45,139

Special Mention [Member] | Nonfarm, Nonresidential [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

2,141,634

1,230,275

Guaranteed portion of loans

854,665

201,002

Special Mention [Member] | Loans-Commercial and Industrial [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

1,255,114

1,035,171

Guaranteed portion of loans

866,917

647,093

Special Mention [Member] | Consumer [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

259

6,888

Guaranteed portion of loans

Special Mention [Member] | Other [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

195,990

Substandard [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

177,277

262,834

Guaranteed portion of loans

62,566

Financing Receivable, Aggregate Rate

0.10%

0.20%

Substandard [Member] | Construction and Land Development [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Guaranteed portion of loans

Substandard [Member] | Residential, 1-4 Families [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Substandard [Member] | Nonfarm, Nonresidential [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

177,277

262,834

Guaranteed portion of loans

62,566

Substandard [Member] | Loans-Commercial and Industrial [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Substandard [Member] | Consumer [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Guaranteed portion of loans

Substandard [Member] | Other [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Doubtful [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Financing Receivable, Aggregate Rate

Doubtful [Member] | Construction and Land Development [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Guaranteed portion of loans

Doubtful [Member] | Residential, 1-4 Families [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Doubtful [Member] | Nonfarm, Nonresidential [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Doubtful [Member] | Loans-Commercial and Industrial [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Doubtful [Member] | Consumer [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality

Guaranteed portion of loans

Doubtful [Member] | Other [Member]

Financing Receivable, Recorded Investment [Line Items]

Loans, Gross carrying value / Loans by credit quality