DEBT SECURITIES - Schedule of Maturity of Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 80,143
Due after one year through five years	140,060
Due after five years through ten years	508,143
Due after ten years	1,348,065
Amortized Cost	2,076,411	$ 2,334,630
Fair Value
Due in one year or less	78,203
Due after one year through five years	132,010
Due after five years through ten years	481,333
Due after ten years	1,138,350
Fair Value	1,829,896	2,087,571
Amortized Cost
Due after one year through five years	72,525
Due after five years through ten years	26,751
Due after ten years	751,985
Amortized Cost	851,261	872,628
Fair Value
Due after one year through five years	67,892
Due after five years through ten years	23,992
Due after ten years	605,571
Fair Value	$ 697,455	$ 730,397