INVESTMENT SECURITIES - Debt Maturities (Details) - Investment Securities - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized Cost
Due within one year	$ 474,409
Due after one year through five years	1,817,099
Due after five years through ten years	2,373,772
Due after ten years	744,752
Available-for-sale, amortized cost	5,410,032	$ 5,060,135
Fair Value
Due within one year	473,263
Due after one year through five years	1,789,557
Due after five years through ten years	2,256,442
Due after ten years	729,453
Total fair value	$ 5,248,715	$ 4,918,931
Weighted- Average Yield
Due within one year	2.75%
Due after one year through five years	4.35%
Due after five years through ten years	4.23%
Due after ten years	5.61%
Weighted-average yield	4.33%