DEBT SECURITIES - Schedule of Maturity of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 13,055
Due after one year through five years	59,849
Due after five years through ten years	373,230
Due after ten years	1,805,597
Amortized Cost	2,251,731	$ 2,039,952
Fair Value
Due in one year or less	12,989
Due after one year through five years	57,288
Due after five years through ten years	359,557
Due after ten years	1,669,425
Fair Value	2,099,259	1,810,221
Amortized Cost
Due in one year or less	31,564
Due after one year through five years	38,433
Due after five years through ten years	14,719
Due after ten years	700,105
Amortized Cost	784,821	826,630
Fair Value
Due in one year or less	31,320
Due after one year through five years	36,972
Due after five years through ten years	13,268
Due after ten years	577,911
Fair Value	$ 659,471	$ 675,053