LOSS AND LOSS ADJUSTMENT RESERVES - (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Dec. 31, 2017
Personal Auto Liability [Member]
Liability for Catastrophe Claims [Line Items]
Unfavorable loss and LAE reserve			$ 13.9
Reserve and Accruals, Unfavorable Loss and LAE Reserve, Exceeding Premium Caps			$ 8.0
Quota Share Treaties [Member] | Property Insurance Product Line [Member] | Florida [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of quota share reinsurance treaty	10.00%	30.00%	30.00%