ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Net realized investment gains (losses)	$ 1,007,209		$ (176,368)	$ 3,850,335		$ 7,603,625
Income tax expense (benefit), current	(3,875,166)		(2,852,716)	(11,973,380)		(8,550,202)
Total reclassification adjustment	299,378	[1]		1,436,797	[1]
Unrealized Gains and (Losses) on Available-for-sale securities | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net realized investment gains (losses)	1,007,209	[1]		3,850,335	[1]
Income tax expense (benefit), current	(352,524)	[1]		(1,347,618)	[1]
Total reclassification adjustment	654,685	[1]		2,502,717	[1]
Unrecognized pension and postretirement benefit obligations | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net actuarial loss	(723,670)	[1],[2]		(2,171,010)	[1],[2]
Prior service credit	177,045	[1],[2]		531,135	[1],[2]
Total before tax	(546,625)	[1]		(1,639,875)	[1]
Income tax expense (benefit), current	191,318	[1]		573,955	[1]
Total reclassification adjustment	$ (355,307)	[1]		$ (1,065,920)	[1]

[1] Amounts in parentheses indicate debits to net income

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement benefit costs (see Note 6, Employee Retirement Plans, for additional details).