Changes in Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains on sale of securities available for sale	$ 267,773	$ 493,955	$ 270,714	$ 502,816
Reclassification adjustment for gains recognized in income, tax	50,243	167,945	51,243	170,957
Net impairment loss on an other-than-temporarily-impaired security	120,000		120,000
Tax effect included as a component of income tax expense	40,800		40,800
Net Unrealized Gains (Losses) on Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment for gains recognized in income, tax	50,243	167,945	51,243	170,957
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Gains (Losses) on Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains on sale of securities available for sale			270,714	502,816
Reclassification adjustment for gains recognized in income, tax			$ 92,043	$ 170,957