SUMMARY OF INVESTMENTS (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sale of held-to-maturity securities	$ 0	$ 0	$ 0
Trading securities	23,273,000	20,034,000
Remaining potential off-balance sheet contractual obligation (up to)	2,175,000
Fixed maturities
Other-than-temporary impairment charges	0	0	1,300,000
Equity securities
Other-than-temporary impairment charges	0	0	0
Equity securities | Maximum
Largest unrealized loss greater than 12 months on an individual security	$ 158,000	$ 188,000	$ 225,000