INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 309,115
Due from one year to five years	599,286
Due from five to ten years	114,430
Due after ten years	7,933
Mortgage-backed securities	928,274
Amortized Cost	1,959,038	$ 1,708,196
Estimated Fair Value
Due in one year or less	308,492
Due from one year to five years	602,368
Due from five to ten years	113,835
Due after ten years	7,134
Mortgage-backed securities	911,182
Estimated Fair Value	1,943,011	1,671,260
Amortized Cost
Due in one year or less	0
Due from one year to five years	0
Due from five to ten years	0
Due after ten years	33,597
Mortgage-backed securities	140,160
Amortized Cost	173,757	164,677
Estimated Fair Value
Due in one year or less	0
Due from one year to five years	0
Due from five to ten years	0
Due after ten years	26,637
Mortgage-backed securities	128,222
Estimated Fair Value	$ 154,859	$ 144,028