DEBT SECURITIES - Schedule of Maturity of Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 71,960
Due after one year through five years	244,231
Due after five years through ten years	418,655
Due after ten years	1,599,784
Amortized Cost	2,334,630	$ 2,772,453
Fair Value
Due in one year or less	71,429
Due after one year through five years	230,299
Due after five years through ten years	388,864
Due after ten years	1,396,979
Fair Value	2,087,571	2,461,393
Amortized Cost
Due after one year through five years	73,943
Due after five years through ten years	28,489
Due after ten years	770,196
Amortized Cost	872,628	918,312
Fair Value
Due after one year through five years	69,373
Due after five years through ten years	25,824
Due after ten years	635,200
Fair Value	$ 730,397	$ 785,295