Accumulated Other Comprehensive Income - Reclassification of Unrealized Gains and Impairments on Securities and Pension and Postemployment Related Costs (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on sale of securities available-for-securities	$ 283,706	$ 957,760
Loss on security with other-than-temporary impairment	(288,000)
Salaries and employee benefits	(6,413,632)	(5,702,656)
Tax (expense) benefit	(399,129)	(210,472)
Reclassification out of Accumulated Other Comprehensive Income | Holding gains (losses) on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on sale of securities available-for-securities	284,000	(957,000)
Loss on security with other-than-temporary impairment	(288,000)
Tax (expense) benefit	1,000	325,000
Impact on net income	(3,000)	(632,000)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Post employment costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	422,000	(523,000)
Tax (expense) benefit	(144,000)	178,000
Impact on net income	$ 278,000	$ (345,000)