INVESTMENTS (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	$ 1,076,411,155		$ 1,076,411,155		$ 1,032,695,902
Gross unrealized gains	92,982,532		92,982,532		108,828,734
Gross unrealized losses	14,751,908		14,751,908		1,435,954
Estimated fair value	1,154,641,779		1,154,641,779		1,140,088,682
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	283,584,371		283,584,371		68,639,279
Twelve months or longer, Fair value	12,621,853		12,621,853		1,884,000
Total, Fair value	296,206,224		296,206,224		70,523,279
Less than twelve months, Unrealized losses	13,851,457		13,851,457		1,319,954
Twelve months or longer, Unrealized losses	900,451		900,451		116,000
Total, Unrealized losses	14,751,908		14,751,908		1,435,954
Amortized cost
Due in one year or less	9,155,165		9,155,165
Due after one year through five years	170,883,036		170,883,036
Due after five years through ten years	147,061,947		147,061,947
Due after ten years	484,235,802		484,235,802
Mortgage-backed securities	149,677,711		149,677,711
Totals	961,013,661		961,013,661
Estimated fair value
Due in one year or less	9,258,884		9,258,884
Due after one year through five years	180,032,167		180,032,167
Due after five years through ten years	155,425,963		155,425,963
Due after ten years	496,070,477		496,070,477
Mortgage-backed securities	156,277,072		156,277,072
Totals	997,064,563		997,064,563		999,794,857
Available-for-sale securities, gross realized gain (loss) [Abstract]
'Other-than-temporary' impairments	0	(126,048)	(20,608)	(126,048)
Net realized investment gains (losses)	175,253	(1,138,336)	2,843,126	7,779,993
Debt securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	961,013,661		961,013,661		920,843,939
Gross unrealized gains	50,344,640		50,344,640		79,822,707
Gross unrealized losses	14,293,738		14,293,738		871,789
Estimated fair value	997,064,563		997,064,563		999,794,857
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	274,988,209		274,988,209		63,828,814
Twelve months or longer, Fair value	10,705,933		10,705,933		0
Total, Fair value	285,694,142		285,694,142		63,828,814
Less than twelve months, Unrealized losses	13,477,367		13,477,367		871,789
Twelve months or longer, Unrealized losses	816,371		816,371		0
Total, Unrealized losses	14,293,738		14,293,738		871,789
Available-for-sale securities, gross realized gain (loss) [Abstract]
Available-for-sale, Gross realized investment gains	131,000	108,016	817,573	508,507
Available-for-sale, Gross realized investment losses	(725,062)	0	(725,062)	0
Debt securities [Member] | U.S. treasury [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	9,522,918		9,522,918		4,697,762
Gross unrealized gains	223,279		223,279		287,140
Gross unrealized losses	134,150		134,150		0
Estimated fair value	9,612,047		9,612,047		4,984,902
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	4,682,810		4,682,810
Twelve months or longer, Fair value	0		0
Total, Fair value	4,682,810		4,682,810
Less than twelve months, Unrealized losses	134,150		134,150
Twelve months or longer, Unrealized losses	0		0
Total, Unrealized losses	134,150		134,150
Debt securities [Member] | U.S. government-sponsored agencies [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	142,088,929		142,088,929		159,548,303
Gross unrealized gains	1,802,645		1,802,645		3,228,302
Gross unrealized losses	6,464,459		6,464,459		333,975
Estimated fair value	137,427,115		137,427,115		162,442,630
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	95,885,094		95,885,094		33,950,271
Twelve months or longer, Fair value	5,555,418		5,555,418		0
Total, Fair value	101,440,512		101,440,512		33,950,271
Less than twelve months, Unrealized losses	6,032,242		6,032,242		333,975
Twelve months or longer, Unrealized losses	432,217		432,217		0
Total, Unrealized losses	6,464,459		6,464,459		333,975
Debt securities [Member] | Obligations of states and political subdivisions [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	355,773,565		355,773,565		335,188,220
Gross unrealized gains	21,735,855		21,735,855		35,776,373
Gross unrealized losses	3,936,005		3,936,005		2,479
Estimated fair value	373,573,415		373,573,415		370,962,114
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	68,612,301		68,612,301		3,234,180
Twelve months or longer, Fair value	0		0		0
Total, Fair value	68,612,301		68,612,301		3,234,180
Less than twelve months, Unrealized losses	3,936,005		3,936,005		2,479
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	3,936,005		3,936,005		2,479
Debt securities [Member] | Commercial mortgage-backed [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	61,484,434		61,484,434		69,952,036
Gross unrealized gains	6,792,466		6,792,466		10,412,989
Gross unrealized losses	6,507		6,507		15,843
Estimated fair value	68,270,393		68,270,393		80,349,182
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	3,775,449		3,775,449		3,773,043
Twelve months or longer, Fair value	101,493		101,493		0
Total, Fair value	3,876,942		3,876,942		3,773,043
Less than twelve months, Unrealized losses	5,865		5,865		15,843
Twelve months or longer, Unrealized losses	642		642		0
Total, Unrealized losses	6,507		6,507		15,843
Debt securities [Member] | Residential mortgage-backed [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	88,193,277		88,193,277		46,286,598
Gross unrealized gains	1,293,620		1,293,620		1,777,113
Gross unrealized losses	1,480,218		1,480,218		274,107
Estimated fair value	88,006,679		88,006,679		47,789,604
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	43,516,137		43,516,137		5,303,741
Twelve months or longer, Fair value	0		0		0
Total, Fair value	43,516,137		43,516,137		5,303,741
Less than twelve months, Unrealized losses	1,480,218		1,480,218		274,107
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	1,480,218		1,480,218		274,107
Debt securities [Member] | Other asset-backed [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	9,109,718		9,109,718		9,720,662
Gross unrealized gains	1,269,548		1,269,548		1,566,186
Gross unrealized losses	0		0		0
Estimated fair value	10,379,266		10,379,266		11,286,848
Debt securities [Member] | Corporate [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	294,840,820		294,840,820		295,450,358
Gross unrealized gains	17,227,227		17,227,227		26,774,604
Gross unrealized losses	2,272,399		2,272,399		245,385
Estimated fair value	309,795,648		309,795,648		321,979,577
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	58,516,418		58,516,418		17,567,579
Twelve months or longer, Fair value	5,049,022		5,049,022		0
Total, Fair value	63,565,440		63,565,440		17,567,579
Less than twelve months, Unrealized losses	1,888,887		1,888,887		245,385
Twelve months or longer, Unrealized losses	383,512		383,512		0
Total, Unrealized losses	2,272,399		2,272,399		245,385
Equity securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	115,397,494		115,397,494		111,851,963
Gross unrealized gains	42,637,892		42,637,892		29,006,027
Gross unrealized losses	458,170		458,170		564,165
Estimated fair value	157,577,216		157,577,216		140,293,825
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	8,596,162		8,596,162		4,810,465
Twelve months or longer, Fair value	1,915,920		1,915,920		1,884,000
Total, Fair value	10,512,082		10,512,082		6,694,465
Less than twelve months, Unrealized losses	374,090		374,090		448,165
Twelve months or longer, Unrealized losses	84,080		84,080		116,000
Total, Unrealized losses	458,170		458,170		564,165
Available-for-sale securities, gross realized gain (loss) [Abstract]
Available-for-sale, Gross realized investment gains	1,233,603	348,743	3,324,210	8,954,418
Available-for-sale, Gross realized investment losses	(464,288)	(1,469,047)	(552,987)	(1,556,884)
'Other-than-temporary' impairments	0	(126,048)	(20,608)	(126,048)
Equity securities [Member] | Financial services [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	19,148,813		19,148,813		14,496,766
Gross unrealized gains	6,659,473		6,659,473		3,630,544
Gross unrealized losses	0		0		33,922
Estimated fair value	25,808,286		25,808,286		18,093,388
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value					881,580
Twelve months or longer, Fair value					0
Total, Fair value					881,580
Less than twelve months, Unrealized losses					33,922
Twelve months or longer, Unrealized losses					0
Total, Unrealized losses					33,922
Equity securities [Member] | Common stocks Information technology [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	11,109,733		11,109,733		12,331,378
Gross unrealized gains	5,044,696		5,044,696		4,722,076
Gross unrealized losses	34,595		34,595		127,690
Estimated fair value	16,119,834		16,119,834		16,925,764
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	1,254,591		1,254,591		1,435,122
Twelve months or longer, Fair value	0		0		0
Total, Fair value	1,254,591		1,254,591		1,435,122
Less than twelve months, Unrealized losses	34,595		34,595		127,690
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	34,595		34,595		127,690
Equity securities [Member] | Common stocks Healthcare [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	14,625,188		14,625,188		14,823,967
Gross unrealized gains	6,833,228		6,833,228		4,199,882
Gross unrealized losses	0		0		0
Estimated fair value	21,458,416		21,458,416		19,023,849
Equity securities [Member] | Common stocks Consumer staples [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	10,249,239		10,249,239		12,019,892
Gross unrealized gains	2,976,155		2,976,155		1,593,039
Gross unrealized losses	27		27		3,404
Estimated fair value	13,225,367		13,225,367		13,609,527
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	29,711		29,711		90,080
Twelve months or longer, Fair value	0		0		0
Total, Fair value	29,711		29,711		90,080
Less than twelve months, Unrealized losses	27		27		3,404
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	27		27		3,404
Equity securities [Member] | Common stocks Consumer discretionary [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	11,919,702		11,919,702		10,829,547
Gross unrealized gains	8,842,824		8,842,824		6,261,000
Gross unrealized losses	0		0		0
Estimated fair value	20,762,526		20,762,526		17,090,547
Equity securities [Member] | Common stocks Energy [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	15,584,575		15,584,575		14,629,926
Gross unrealized gains	6,151,610		6,151,610		4,800,404
Gross unrealized losses	176,175		176,175		0
Estimated fair value	21,560,010		21,560,010		19,430,330
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	3,164,811		3,164,811
Twelve months or longer, Fair value	0		0
Total, Fair value	3,164,811		3,164,811
Less than twelve months, Unrealized losses	176,175		176,175
Twelve months or longer, Unrealized losses	0		0
Total, Unrealized losses	176,175		176,175
Equity securities [Member] | Common stocks Industrials [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	7,776,577		7,776,577		7,638,633
Gross unrealized gains	2,473,171		2,473,171		936,183
Gross unrealized losses	0		0		0
Estimated fair value	10,249,748		10,249,748		8,574,816
Equity securities [Member] | Common stocks Other [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	16,651,229		16,651,229		16,749,417
Gross unrealized gains	3,205,873		3,205,873		2,215,172
Gross unrealized losses	163,293		163,293		283,149
Estimated fair value	19,693,809		19,693,809		18,681,440
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	4,147,049		4,147,049		2,403,683
Twelve months or longer, Fair value	0		0		0
Total, Fair value	4,147,049		4,147,049		2,403,683
Less than twelve months, Unrealized losses	163,293		163,293		283,149
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	163,293		163,293		283,149
Equity securities [Member] | Non-redeemable Preferred stocks [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	8,332,438		8,332,438		8,332,437
Gross unrealized gains	450,862		450,862		647,727
Gross unrealized losses	84,080		84,080		116,000
Estimated fair value	8,699,220		8,699,220		8,864,164
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	0		0		0
Twelve months or longer, Fair value	1,915,920		1,915,920		1,884,000
Total, Fair value	1,915,920		1,915,920		1,884,000
Less than twelve months, Unrealized losses	0		0		0
Twelve months or longer, Unrealized losses	84,080		84,080		116,000
Total, Unrealized losses	$ 84,080		$ 84,080		$ 116,000