LOSS AND LOSS ADJUSTMENT RESERVES - (Schedule of Reconciliation of Net Incurred and Paid Development) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Liability for Claims and Claims Adjustment Expense [Abstract]
Total liabilities for unpaid losses and LAE, net of reinsurance	$ 156,324	$ 125,541
Reinsurance Recoverables on Unpaid Losses, Gross to Net [Abstract]
Total reinsurance recoverables	164,429	166,396
Unallocated loss adjustment expenses	3,609	4,293
Unfavorable loss and LAE reserve	324,362	296,230	$ 230,515	$ 158,110
Homeowners [Member]
Liability for Claims and Claims Adjustment Expense [Abstract]
Total liabilities for unpaid losses and LAE, net of reinsurance	137,168	102,279
Reinsurance Recoverables on Unpaid Losses, Gross to Net [Abstract]
Total reinsurance recoverables	160,578	158,043
Unfavorable loss and LAE reserve	137,168
Commercial General Liability [Member]
Liability for Claims and Claims Adjustment Expense [Abstract]
Total liabilities for unpaid losses and LAE, net of reinsurance	17,014	18,888
Reinsurance Recoverables on Unpaid Losses, Gross to Net [Abstract]
Total reinsurance recoverables	500	0
Unfavorable loss and LAE reserve	17,014
Personal Auto Liability [Member]
Liability for Claims and Claims Adjustment Expense [Abstract]
Total liabilities for unpaid losses and LAE, net of reinsurance	2,142	4,374
Reinsurance Recoverables on Unpaid Losses, Gross to Net [Abstract]
Total reinsurance recoverables	3,228	8,275
Unfavorable loss and LAE reserve	2,142
Flood Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Abstract]
Total liabilities for unpaid losses and LAE, net of reinsurance	0	0
Reinsurance Recoverables on Unpaid Losses, Gross to Net [Abstract]
Total reinsurance recoverables	$ 123	$ 78