ACQUISITION (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		0 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Casualty	Sep. 30, 2012 Casualty	Sep. 30, 2013 Casualty	Sep. 30, 2012 Casualty	Nov. 02, 2012 Rockbridge state	Sep. 30, 2013 Rockbridge	Sep. 30, 2013 Rockbridge Casualty	Sep. 30, 2013 Rockbridge Casualty
Business acquisition
Number of states in which coverage is offered to individual physicians and physician groups									50
Total business acquisition consideration									$ 16,700,000
Business acquisition consideration paid in cash									15,500,000
Present value of an earn-out agreement to be paid in future years									1,200,000	1,200,000
Premiums written											3,500,000	11,500,000
Premiums Earned, Net	$ 163,702,000	$ 149,943,000	$ 462,406,000	$ 428,807,000	$ 83,966,000	$ 68,194,000	$ 235,307,000	$ 197,409,000			$ 2,700,000	$ 5,100,000