INVESTMENTS (Major Categories of Investment Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Gain (Loss) on Securities [Line Items]
Investment gains (losses)	$ 1,430	$ (117)	$ 988	$ 2,120
Gains (losses) on trading securities	5	1	(1)	9
Realized gains (losses) on fixed maturities
Gain (Loss) on Securities [Line Items]
Investment gains (losses)	1,091	(24)	1,107	(9)
Change in fair value of equity securities
Gain (Loss) on Securities [Line Items]
Investment gains (losses)	223	(80)	(272)	72
Change in surrender value of company owned life insurance
Gain (Loss) on Securities [Line Items]
Investment gains (losses)	125	(14)	165	256
Realized gain on company owned life insurance
Gain (Loss) on Securities [Line Items]
Investment gains (losses)	0	0	0	1,792
Other losses principally real estate
Gain (Loss) on Securities [Line Items]
Investment gains (losses)	$ (14)	$ 0	$ (11)	$ 0