DEBT SECURITIES - Maturity of Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 135,698
Due after one year through five years	395,914
Due after five years through ten years	364,065
Due after ten years	1,876,776
Amortized Cost	2,772,453	$ 4,013,523
Fair Value
Due in one year or less	133,967
Due after one year through five years	368,754
Due after five years through ten years	330,280
Due after ten years	1,628,392
Fair Value	2,461,393	3,981,251
Amortized Cost
Due after one year through five years	44,392
Due after five years through ten years	64,593
Due after ten years	809,327
Amortized Cost	918,312	$ 0
Fair Value
Due after one year through five years	41,483
Due after five years through ten years	57,955
Due after ten years	685,857
Fair Value	$ 785,295