ACQUISITION (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended					3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Casualty	Jun. 30, 2012 Casualty	Jun. 30, 2013 Casualty	Jun. 30, 2012 Casualty	Jun. 30, 2013 Rockbridge	Jan. 31, 2013 Rockbridge item	Nov. 02, 2012 Rockbridge state	Jun. 30, 2013 Rockbridge Casualty	Jun. 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
Amount of goodwill resulting from acquisition											12,400,000
Amount of separately identifiable intangible assets resulting from acquisition									4,000,000		4,200,000
Adjustments to valuation of acquisition										0
Premiums written												2,900,000	7,900,000
Premiums Earned, Net	$ 154,553,000	$ 141,584,000	$ 298,704,000	$ 278,864,000	$ 78,372,000	$ 65,705,000	$ 151,341,000	$ 129,215,000				$ 1,700,000	$ 2,500,000