CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
OTHER COMPREHENSIVE INCOME (LOSS)
Change in unrealized holding gains (losses) on investment securities, deferred income tax expense (benefit)	$ (12,910,017)	$ 1,465,263	$ (9,211,661)	$ 7,938,801
Reclassification adjustment for realized investment (gains) losses included in net income (loss), income tax (expense) benefit	(61,339)	398,418	(995,094)	(2,722,997)
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit cost, deferred income tax expense (benefit)	$ 193,891	$ 233,993	$ 382,637	$ 467,984