Fair Value - Estimated Fair Values of Financial Instruments (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Fair Value Assets Liabilities Quantitative Information [Line Items]
Financial Instruments-Assets Loans Carrying Amount	$ 178,519,116	$ 173,577,565
Financial Instrument-Liabilities Deposits Carrying Amount	193,695,070	187,823,037
Long-Term Debt Carrying Amount	7,750,000	7,750,000
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair Value Assets Liabilities Quantitative Information [Line Items]
Financial Instruments-Assets Loans Fair Value
Financial Instrument-Liabilities Deposits Fair Value
Long-Term Debt, Fair Value
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets Liabilities Quantitative Information [Line Items]
Financial Instrument-Liabilities Deposits Fair Value	176,159,000	180,777,000
Long-Term Debt, Fair Value	8,141,000	8,291,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets Liabilities Quantitative Information [Line Items]
Financial Instruments-Assets Loans Fair Value	178,779,000	173,813,000
Carrying Amount [Member]
Fair Value Assets Liabilities Quantitative Information [Line Items]
Financial Instruments-Assets Loans Carrying Amount	178,519,000	173,578,000
Financial Instrument-Liabilities Deposits Carrying Amount	193,695,000	187,823,000
Long-Term Debt Carrying Amount	7,750,000	7,750,000
Fair Value [Member]
Fair Value Assets Liabilities Quantitative Information [Line Items]
Financial Instruments-Assets Loans Fair Value	178,779,000	173,813,000
Financial Instrument-Liabilities Deposits Fair Value	176,159,000	180,777,000
Long-Term Debt, Fair Value	$ 8,141,000	$ 8,291,000