SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Details About AOCI (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Details about AOCI Components
Investment income	$ 592	$ 535	$ 425	$ 466	$ 491	$ 365	$ 193	$ 222	$ 2,018	$ 1,271	$ 542
Reclassification Out Of Accumulated Other Comprehensive Income (Loss)
Details about AOCI Components
Investment income									113	32	(40)
Accumulated Net Unrealized Investment Gain Loss | Reclassification Out Of Accumulated Other Comprehensive Income (Loss)
Details about AOCI Components
Investment income									$ 113	$ 32	$ (40)