INVESTMENT SECURITIES - Held-to-Maturity Securities (Details) - Investment securities - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Amortized Cost
Due within one year	$ 566,164
Due after one year through five years	396,194
Due after five years through ten years	328,640
Due after ten years	2,663,302
Total, Amortized	3,954,300
Fair Value
Due within one year	571,874
Due after one year through five years	389,606
Due after five years through ten years	301,797
Due after ten years	2,530,675
Total, Fair Value	$ 3,793,952	$ 4,823,164
Weighted- Average Yield
Due within one year	2.73%
Due after one year through five years	4.81%
Due after five years through ten years	3.83%
Due after ten years	4.24%
Total, weighted-average yield	4.04%
Held-to-maturity, accrued interest excluded	$ 56,700	$ 59,900