SEGMENT INFORMATION - Net premiums earned by segment and lines of insurance (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue from External Customer [Line Items]
Premiums earned	$ 132,362,761	$ 121,544,787	$ 380,048,293	$ 341,575,003
Property and casualty insurance [Member]
Revenue from External Customer [Line Items]
Premiums earned	100,085,034	91,059,723	290,606,939	263,916,398
Property and casualty insurance [Member] | Commercial Lines [Member]
Revenue from External Customer [Line Items]
Premiums earned	87,339,330	78,013,556	252,265,389	225,471,376
Property and casualty insurance [Member] | Commercial Lines [Member] | Automobile Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	22,254,403	19,376,448	63,475,114	56,285,845
Property and casualty insurance [Member] | Commercial Lines [Member] | Property Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	22,337,108	19,759,640	64,147,627	56,847,261
Property and casualty insurance [Member] | Commercial Lines [Member] | Workers Compensation Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	20,784,052	19,145,924	61,337,806	55,871,081
Property and casualty insurance [Member] | Commercial Lines [Member] | Liability Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	20,066,260	17,810,692	57,700,835	50,780,868
Property and casualty insurance [Member] | Commercial Lines [Member] | Other Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	1,897,507	1,920,852	5,604,007	5,686,321
Property and casualty insurance [Member] | Personal Lines [Member]
Revenue from External Customer [Line Items]
Premiums earned	12,745,704	13,046,167	38,341,550	38,445,022
Property and casualty insurance [Member] | Personal Lines [Member] | Automobile Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	6,875,623	7,196,251	20,715,002	21,290,619
Property and casualty insurance [Member] | Personal Lines [Member] | Property Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	5,687,566	5,686,938	17,103,351	16,689,890
Property and casualty insurance [Member] | Personal Lines [Member] | Liability Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	182,515	162,978	523,197	464,513
Reinsurance [Member]
Revenue from External Customer [Line Items]
Premiums earned	32,277,727	30,485,064	89,441,354	77,658,605
Reinsurance [Member] | Pro rata reinsurance [Member]
Revenue from External Customer [Line Items]
Premiums earned	13,174,222	11,720,914	33,379,374	25,564,939
Reinsurance [Member] | Pro rata reinsurance [Member] | Property And Liability Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	823,719	2,135,062	4,336,189	5,697,204
Reinsurance [Member] | Pro rata reinsurance [Member] | Property Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	5,862,717	6,872,183	14,134,360	13,639,815
Reinsurance [Member] | Pro rata reinsurance [Member] | Liability Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	1,431,515	314,036	2,949,470	953,412
Reinsurance [Member] | Pro rata reinsurance [Member] | Crop Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	612,042	780,496	1,558,449	1,253,055
Reinsurance [Member] | Pro rata reinsurance [Member] | Marine And Aviation Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	4,444,229	1,619,137	10,400,906	4,021,453
Reinsurance [Member] | Excess of loss reinsurance [Member]
Revenue from External Customer [Line Items]
Premiums earned	19,103,505	18,764,150	56,061,980	52,093,666
Reinsurance [Member] | Excess of loss reinsurance [Member] | Property Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	16,509,055	15,939,014	47,957,571	43,253,472
Reinsurance [Member] | Excess of loss reinsurance [Member] | Liability Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	2,594,450	2,824,723	8,104,353	8,831,624
Reinsurance [Member] | Excess of loss reinsurance [Member] | Fidelity And Surety Insurance L O B [Member]
Revenue from External Customer [Line Items]
Premiums earned	$ 0	$ 413	$ 56	$ 8,570