INVESTMENTS (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	$ 1,079,252,648		$ 1,079,252,648		$ 1,032,695,902
Gross unrealized gains	94,484,754		94,484,754		108,828,734
Gross unrealized losses	17,771,264		17,771,264		1,435,954
Estimated fair value	1,155,966,138		1,155,966,138		1,140,088,682
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	283,666,436		283,666,436		68,639,279
Twelve months or longer, Fair value	14,063,797		14,063,797		1,884,000
Total, Fair value	297,730,233		297,730,233		70,523,279
Less than twelve months, Unrealized losses	16,654,956		16,654,956		1,319,954
Twelve months or longer, Unrealized losses	1,116,308		1,116,308		116,000
Total, Unrealized losses	17,771,264		17,771,264		1,435,954
Amortized cost
Due in one year or less	3,682,036		3,682,036
Due after one year through five years	181,818,898		181,818,898
Due after five years through ten years	144,969,430		144,969,430
Due after ten years	474,794,908		474,794,908
Mortgage-backed securities	155,538,792		155,538,792
Totals	960,804,064		960,804,064
Estimated fair value
Due in one year or less	3,745,814		3,745,814
Due after one year through five years	191,773,935		191,773,935
Due after five years through ten years	153,041,671		153,041,671
Due after ten years	480,847,739		480,847,739
Mortgage-backed securities	161,071,190		161,071,190
Totals	990,480,349		990,480,349		999,794,857
Available-for-sale securities, gross realized gain (loss) [Abstract]
'Other-than-temporary' impairments	(3,010)	(22,815)	(23,618)	(148,863)
Net realized investment gains (losses)	1,007,209	(176,368)	3,850,335	7,603,625
Debt Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	960,804,064		960,804,064		920,843,939
Gross unrealized gains	46,577,130		46,577,130		79,822,707
Gross unrealized losses	16,900,845		16,900,845		871,789
Estimated fair value	990,480,349		990,480,349		999,794,857
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	270,139,181		270,139,181		63,828,814
Twelve months or longer, Fair value	12,346,757		12,346,757		0
Total, Fair value	282,485,938		282,485,938		63,828,814
Less than twelve months, Unrealized losses	16,067,497		16,067,497		871,789
Twelve months or longer, Unrealized losses	833,348		833,348		0
Total, Unrealized losses	16,900,845		16,900,845		871,789
Available-for-sale securities, gross realized gain (loss) [Abstract]
Available-for-sale, Gross realized investment gains	43,955	134,537	861,528	643,044
Available-for-sale, Gross realized investment losses	0	0	(725,062)	0
US Treasury Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	9,531,254		9,531,254		4,697,762
Gross unrealized gains	214,292		214,292		287,140
Gross unrealized losses	187,926		187,926		0
Estimated fair value	9,557,620		9,557,620		4,984,902
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	4,633,205		4,633,205
Twelve months or longer, Fair value	0		0
Total, Fair value	4,633,205		4,633,205
Less than twelve months, Unrealized losses	187,926		187,926
Twelve months or longer, Unrealized losses	0		0
Total, Unrealized losses	187,926		187,926
US Government-sponsored Enterprises Debt Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	144,955,495		144,955,495		159,548,303
Gross unrealized gains	1,548,635		1,548,635		3,228,302
Gross unrealized losses	8,037,110		8,037,110		333,975
Estimated fair value	138,467,020		138,467,020		162,442,630
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	94,003,751		94,003,751		33,950,271
Twelve months or longer, Fair value	5,480,724		5,480,724		0
Total, Fair value	99,484,475		99,484,475		33,950,271
Less than twelve months, Unrealized losses	7,529,486		7,529,486		333,975
Twelve months or longer, Unrealized losses	507,624		507,624		0
Total, Unrealized losses	8,037,110		8,037,110		333,975
US States and Political Subdivisions Debt Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	341,339,428		341,339,428		335,188,220
Gross unrealized gains	18,103,554		18,103,554		35,776,373
Gross unrealized losses	4,182,059		4,182,059		2,479
Estimated fair value	355,260,923		355,260,923		370,962,114
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	69,172,304		69,172,304		3,234,180
Twelve months or longer, Fair value	0		0		0
Total, Fair value	69,172,304		69,172,304		3,234,180
Less than twelve months, Unrealized losses	4,182,059		4,182,059		2,479
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	4,182,059		4,182,059		2,479
Commercial Mortgage Backed Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	57,780,949		57,780,949		69,952,036
Gross unrealized gains	6,407,168		6,407,168		10,412,989
Gross unrealized losses	2,357		2,357		15,843
Estimated fair value	64,185,760		64,185,760		80,349,182
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	3,795,328		3,795,328		3,773,043
Twelve months or longer, Fair value	0		0		0
Total, Fair value	3,795,328		3,795,328		3,773,043
Less than twelve months, Unrealized losses	2,357		2,357		15,843
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	2,357		2,357		15,843
Residential Mortgage Backed Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	97,757,843		97,757,843		46,286,598
Gross unrealized gains	1,326,156		1,326,156		1,777,113
Gross unrealized losses	2,198,569		2,198,569		274,107
Estimated fair value	96,885,430		96,885,430		47,789,604
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	49,921,645		49,921,645		5,303,741
Twelve months or longer, Fair value	0		0		0
Total, Fair value	49,921,645		49,921,645		5,303,741
Less than twelve months, Unrealized losses	2,198,569		2,198,569		274,107
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	2,198,569		2,198,569		274,107
Collateralized Debt Obligations [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	11,469,906		11,469,906		9,720,662
Gross unrealized gains	1,209,210		1,209,210		1,566,186
Gross unrealized losses	0		0		0
Estimated fair value	12,679,116		12,679,116		11,286,848
Corporate Debt Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	297,969,189		297,969,189		295,450,358
Gross unrealized gains	17,768,115		17,768,115		26,774,604
Gross unrealized losses	2,292,824		2,292,824		245,385
Estimated fair value	313,444,480		313,444,480		321,979,577
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	48,612,948		48,612,948		17,567,579
Twelve months or longer, Fair value	6,866,033		6,866,033		0
Total, Fair value	55,478,981		55,478,981		17,567,579
Less than twelve months, Unrealized losses	1,967,100		1,967,100		245,385
Twelve months or longer, Unrealized losses	325,724		325,724		0
Total, Unrealized losses	2,292,824		2,292,824		245,385
Equity Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	118,448,584		118,448,584		111,851,963
Gross unrealized gains	47,907,624		47,907,624		29,006,027
Gross unrealized losses	870,419		870,419		564,165
Estimated fair value	165,485,789		165,485,789		140,293,825
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	13,527,255		13,527,255		4,810,465
Twelve months or longer, Fair value	1,717,040		1,717,040		1,884,000
Total, Fair value	15,244,295		15,244,295		6,694,465
Less than twelve months, Unrealized losses	587,459		587,459		448,165
Twelve months or longer, Unrealized losses	282,960		282,960		116,000
Total, Unrealized losses	870,419		870,419		564,165
Available-for-sale securities, gross realized gain (loss) [Abstract]
Available-for-sale, Gross realized investment gains	968,255	377,701	4,292,465	9,332,119
Available-for-sale, Gross realized investment losses	(1,991)	(665,791)	(554,978)	(2,222,675)
'Other-than-temporary' impairments	(3,010)	(22,815)	(23,618)	(148,863)
Common stocks Financial services [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	20,702,786		20,702,786		14,496,766
Gross unrealized gains	7,402,292		7,402,292		3,630,544
Gross unrealized losses	85,345		85,345		33,922
Estimated fair value	28,019,733		28,019,733		18,093,388
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	2,760,661		2,760,661		881,580
Twelve months or longer, Fair value	0		0		0
Total, Fair value	2,760,661		2,760,661		881,580
Less than twelve months, Unrealized losses	85,345		85,345		33,922
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	85,345		85,345		33,922
Common stocks Information technology [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	12,031,896		12,031,896		12,331,378
Gross unrealized gains	5,391,369		5,391,369		4,722,076
Gross unrealized losses	31,860		31,860		127,690
Estimated fair value	17,391,405		17,391,405		16,925,764
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	1,066,572		1,066,572		1,435,122
Twelve months or longer, Fair value	0		0		0
Total, Fair value	1,066,572		1,066,572		1,435,122
Less than twelve months, Unrealized losses	31,860		31,860		127,690
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	31,860		31,860		127,690
Common stocks Healthcare [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	14,233,577		14,233,577		14,823,967
Gross unrealized gains	8,164,301		8,164,301		4,199,882
Gross unrealized losses	0		0		0
Estimated fair value	22,397,878		22,397,878		19,023,849
Common stocks Consumer staples [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	10,625,249		10,625,249		12,019,892
Gross unrealized gains	3,223,874		3,223,874		1,593,039
Gross unrealized losses	180		180		3,404
Estimated fair value	13,848,943		13,848,943		13,609,527
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	150,835		150,835		90,080
Twelve months or longer, Fair value	0		0		0
Total, Fair value	150,835		150,835		90,080
Less than twelve months, Unrealized losses	180		180		3,404
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	180		180		3,404
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	10,345,614		10,345,614		6,261,000
Gross unrealized losses	17,612		17,612		0
Estimated fair value	22,247,704		22,247,704		17,090,547
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	242,312		242,312
Twelve months or longer, Fair value	0		0
Total, Fair value	242,312		242,312
Less than twelve months, Unrealized losses	17,612		17,612
Twelve months or longer, Unrealized losses	0		0
Total, Unrealized losses	17,612		17,612
Common stocks Energy [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	15,009,818		15,009,818		14,629,926
Gross unrealized gains	5,585,092		5,585,092		4,800,404
Gross unrealized losses	272,479		272,479		0
Estimated fair value	20,322,431		20,322,431		19,430,330
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	3,209,255		3,209,255
Twelve months or longer, Fair value	0		0
Total, Fair value	3,209,255		3,209,255
Less than twelve months, Unrealized losses	272,479		272,479
Twelve months or longer, Unrealized losses	0		0
Total, Unrealized losses	272,479		272,479
Common stocks Industrials [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	9,268,955		9,268,955		7,638,633
Gross unrealized gains	3,764,217		3,764,217		936,183
Gross unrealized losses	7,109		7,109		0
Estimated fair value	13,026,063		13,026,063		8,574,816
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	610,844		610,844
Twelve months or longer, Fair value	0		0
Total, Fair value	610,844		610,844
Less than twelve months, Unrealized losses	7,109		7,109
Twelve months or longer, Unrealized losses	0		0
Total, Unrealized losses	7,109		7,109
Common stocks Other [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	14,074,163		14,074,163		16,749,417
Gross unrealized gains	3,775,665		3,775,665		2,215,172
Gross unrealized losses	56,736		56,736		283,149
Estimated fair value	17,793,092		17,793,092		18,681,440
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	1,520,476		1,520,476		2,403,683
Twelve months or longer, Fair value	0		0		0
Total, Fair value	1,520,476		1,520,476		2,403,683
Less than twelve months, Unrealized losses	56,736		56,736		283,149
Twelve months or longer, Unrealized losses	0		0		0
Total, Unrealized losses	56,736		56,736		283,149
Nonredeemable Preferred Stock [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	10,582,438		10,582,438		8,332,437
Gross unrealized gains	255,200		255,200		647,727
Gross unrealized losses	399,098		399,098		116,000
Estimated fair value	10,438,540		10,438,540		8,864,164
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	3,966,300		3,966,300		0
Twelve months or longer, Fair value	1,717,040		1,717,040		1,884,000
Total, Fair value	5,683,340		5,683,340		1,884,000
Less than twelve months, Unrealized losses	116,138		116,138		0
Twelve months or longer, Unrealized losses	282,960		282,960		116,000
Total, Unrealized losses	$ 399,098		$ 399,098		$ 116,000