ACQUISITION (Details) (USD $)	3 Months Ended									3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Casualty	Mar. 31, 2012 Casualty	Mar. 31, 2013 Surety	Mar. 31, 2012 Surety	Mar. 31, 2013 Rockbridge	Jan. 31, 2013 Rockbridge item	Nov. 02, 2012 Rockbridge state	Mar. 31, 2013 Rockbridge Casualty
Business acquisition
Number of states in which coverage is offered to individual physicians and physician groups									50
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
Amount of goodwill resulting from acquisition									12,400,000
Amount of separately identifiable intangible assets resulting from acquisition							4,100,000		4,200,000
Adjustments to valuation of acquisition								0
Premiums written										5,000,000
Premiums Earned, Net	$ 144,151,000	$ 137,280,000	$ 72,969,000	$ 63,510,000	$ 26,201,000	$ 26,778,000				$ 800,000