INVESTMENTS - Summary of Allowance for Expected Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 10,551	$ 7,294	$ 11,733	$ 313
Expected credit losses on securities where credit losses were not previously recognized	21	6,320	4,376	13,228
Additions (reductions) for expected credit losses on securities where credit losses were previously recognized	708	(592)	404	(500)
Impairments of securities which the Company intends to sell or more likely than not will be required to sell	0	0	0	0
Securities sold/redeemed/matured	(2,347)	(2,518)	(7,580)	(2,537)
Balance at end of period	$ 8,933	$ 10,504	$ 8,933	$ 10,504