INVESTMENTS - Allowance for credit losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Total ending allowance balance	$ 31	$ 31
Beginning allowance balance		0
Corporate securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Total ending allowance balance	31	31
Recapture of provision for credit losses	(41)	(41)
Beginning allowance balance	$ 72
Corporate securities | Accounting Standards Update 2016-13
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance		$ 72