Accumulated Other Comprehensive Income - Balances in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized holding gains arising during the period, tax	$ (550,331)	$ 77,574
Reclassification for previously unrealized net (gains) recognized in income, tax benefit	1,460	325,638
Net periodic pension cost, tax benefit		257,000
Net gain (loss) pension and postretirement plans, tax expense	143,000	77,574
Net postretirement plan transition cost, tax expense	1,000	1,000
Holding gains (losses) on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized holding gains arising during the period, tax	(550,331)	77,574
Reclassification for previously unrealized net (gains) recognized in income, tax benefit	1,460	325,638
Pension and Post employment costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net periodic pension cost, tax benefit		257,000
Net gain (loss) pension and postretirement plans, tax expense	143,000	77,574
Net postretirement plan transition cost, tax expense	$ 1,000	$ 1,000