Changes in Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (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]
Unrealized holding gains arising during the period, net of tax	$ 422,597	$ 110,298	$ 447,642	$ 73,412
Reclassification adjustment for (gains) and impairments recognized in income, tax	50,243	167,945	51,243	170,957
Net Unrealized Gains (Losses) on Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized holding gains arising during the period, net of tax	422,597	110,298	447,642	73,412
Reclassification adjustment for (gains) and impairments recognized in income, tax	$ 50,243	$ 167,945	$ 51,243	$ 170,957