TRANSACTIONS WITH AFFILIATES (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended				12 Months Ended
	Mar. 31, 2019 USD ($) $ / shares	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) Plan	Jun. 30, 2019 USD ($) Plan	Dec. 31, 2018 USD ($) Plan	Jun. 30, 2018 USD ($) Plan	Dec. 31, 2019 USD ($) Plan	Dec. 31, 2018 USD ($) Plan	May 09, 2019 $ / shares
Related Party Transaction [Line Items]
Offer Price By Parent | $ / shares	$ 30								$ 36
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Ceded premiums earned	$ 105,560	$ 100,038
Ceded losses and settlement expenses incurred	63,195	52,001
Affiliated Entity [Member] | Property and casualty insurance [Member]
Related Party Transaction [Line Items]
Number of reinsurance program treaties | Plan			1	1	1	1	2	2
Ceded premiums earned	104,247	98,725
Ceded losses and settlement expenses incurred	61,462	52,754
Affiliated Entity [Member] | Property and casualty insurance [Member] | Annual Aggregate Catastrophe Excess of Loss [Member]
Related Party Transaction [Line Items]
Catastrophe claims, retention amount			$ 15,000	$ 22,000	$ 15,000	$ 22,000
Affiliated reinsurance contract first layer limit			12,000	24,000	12,000	24,000
Ceded premiums earned			$ 1,400	$ 6,000	$ 1,400	$ 6,000
Ceded losses and settlement expenses incurred	527	467
Affiliated Entity [Member] | Reinsurance [Member]
Related Party Transaction [Line Items]
Number of reinsurance program treaties | Plan							2
Ceded premiums earned	1,313	1,313
Ceded losses and settlement expenses incurred	$ 1,733	$ (753)
Reinsurance Recovered On Industry Loss Warranties								$ 0
Affiliated Entity [Member] | Reinsurance [Member] | Per Occurrence Catastrophe Excess of Loss [Member]
Related Party Transaction [Line Items]
Catastrophe claims, retention amount							$ 10,000
Affiliated reinsurance contract first layer limit							$ 10,000
First layer excess of loss coinsurance percentage (in hundreths)							20.00%
Ceded premiums earned							$ 1,600
Affiliated Entity [Member] | Reinsurance [Member] | Annual Aggregate Catastrophe Excess of Loss [Member]
Related Party Transaction [Line Items]
Catastrophe claims, retention amount							20,000
Affiliated reinsurance contract first layer limit							$ 100,000
First layer excess of loss coinsurance percentage (in hundreths)							20.00%
Ceded premiums earned							$ 3,600
Catastrophe event minimum amount							$ 500