INVESTMENTS (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Debt securities, available-for-sale, unrealized loss position, number of positions | security				281	47
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, number of positions | security				4	2
Fair value of investments deposited with governmental authorities required by law				$ 9,400	$ 11,500
Debt securities, held-to-maturity, sold, amount		$ 70
Held-to-maturity, sold, realized loss (less than)		$ 1
Held-to-maturity securities transferred, amount	$ 4,200
Debt securities, held-to-maturity, fair value	4,300		$ 4,300
Held-to-maturity securities, transfer, unrealized gain	$ 0		$ 58