CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 11,022,240	$ 10,537,755	$ 10,101,873
Other comprehensive income
Unrealized holding gains on securities available for sale	410,834	4,769,697	1,875,749
Change in unrealized gains on securities available for sale for which a portion of an other-than-temporary impairment has been recognized in earnings, net of reclassification	0	27,725	216,110
Reclassification adjustment gains realized in net income	(300,516)	(1,108,091)	(450,666)
Net unrealized gains	110,318	3,689,331	1,641,193
Less: Tax effect	(74,583)	(1,363,289)	(634,911)
Net of tax amount	35,735	2,326,042	1,006,282
Change in funded status of defined benefit pension plan and other benefit plans:
Reclassification adjustment for amortization of prior service costs	(83,144)	67,127	(51,110)
Reclassification adjustment for amortization of net actuarial loss	(2,193,150)	(6,326,761)	(500,107)
Total before tax effect	(2,276,294)	(6,259,634)	(551,217)
Less: Tax effect	875,008	2,389,739	213,245
Net of tax amount	(1,401,286)	(3,869,895)	(337,972)
Total other comprehensive (loss) income	(1,365,551)	(1,543,853)	668,310
Comprehensive income	$ 9,656,689	$ 8,993,902	$ 10,770,183