INVESTMENTS (Net Realized Gains (Losses) by Major Investment Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Gross realized and unrealized gains
Total gross realized and unrealized gains	$ 2,280	$ 1,223	$ 15,274	$ 6,681
Gross Realized and Unrealized Lossses [Abstract]
Debt And Equity Securities, Realized And Unrealized Losses	(956)	(429)	(6,392)	(1,631)
Net realized and unrealized gains (losses) on investments	1,324	794	8,882	5,050
Debt Securities
Gross realized and unrealized gains
Debt securities	919	897	11,708	2,048
Gross Realized and Unrealized Lossses [Abstract]
Debt Securities, Trading, Realized And Unrealized Losses	(121)	(4)	(2,608)	(524)
Equity Securities
Gross realized and unrealized gains
Equity securities	1,361	326	3,566	4,633
Gross Realized and Unrealized Lossses [Abstract]
Equity Securities, FV-NI, Realized And Unrealized Losses	$ (835)	$ (425)	$ (3,784)	$ (1,107)