TRANSACTIONS WITH AFFILIATES (Details) - Affiliated Entity [Member] $ in Thousands	6 Months Ended				12 Months Ended
	Dec. 31, 2017 USD ($) Plan	Jun. 30, 2017 USD ($) Plan	Dec. 31, 2016 USD ($) Plan	Jun. 30, 2016 USD ($) Plan	Dec. 31, 2017 USD ($) Plan	Dec. 31, 2016 USD ($) Plan
Property and casualty insurance [Member]
Related Party Transaction [Line Items]
Number of reinsurance program treaties | Plan	1	1	1	1	2	2
Property and casualty insurance [Member] | Annual Aggregate Catastrophe Excess of Loss [Member]
Related Party Transaction [Line Items]
Catastrophe claims, retention amount	$ 15,000	$ 20,000	$ 15,000	$ 20,000
Affiliated reinsurance contract first layer limit	12,000	24,000	12,000	24,000
Dollar amount of cost of affiliated reinsurance contract	$ 1,400	6,000	$ 1,500	$ 6,300
Reinsurance retention balance		$ 10,200
Reinsurance [Member]
Related Party Transaction [Line Items]
Number of reinsurance program treaties | Plan					2	2
Reinsurance [Member] | Per Occurrence Catastrophe Excess of Loss [Member]
Related Party Transaction [Line Items]
Catastrophe claims, retention amount					$ 10,000	$ 10,000
Affiliated reinsurance contract first layer limit					$ 10,000	$ 10,000
First layer excess of loss coinsurance percentage (in hundreths)					20.00%	20.00%
Dollar amount of cost of affiliated reinsurance contract					$ 1,700	$ 2,000
Reinsurance [Member] | Annual Aggregate Catastrophe Excess of Loss [Member]
Related Party Transaction [Line Items]
Catastrophe claims, retention amount					20,000	20,000
Affiliated reinsurance contract first layer limit					$ 100,000	$ 100,000
First layer excess of loss coinsurance percentage (in hundreths)					20.00%	20.00%
Dollar amount of cost of affiliated reinsurance contract					$ 3,200	$ 3,200
Catastrophe event minimum amount					$ 500	$ 500