SECURITIES (Securities Debt Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Maturing in one year or less	$ 0
Maturing after one year through five years	162,723
Maturing after five years through ten years	370,064
Maturing after ten years through twenty years	2,197,193
Debt Securities, Available-for-sale, Amortized Cost	2,729,980	$ 3,218,777
Fair Value
Maturing in one year or less	0
Maturing after one year through five years	152,661
Maturing after five years through ten years	327,355
Maturing after ten years through twenty years	1,893,767
Securities—available-for-sale	2,373,783	2,789,031
Amortized Cost
Maturing within one year	6,685
Maturing after one year through five years	18,546
Maturing after five years through 10 years	22,220
Maturing after 10 years	1,011,936
Debt Securities, Held-to-maturity	1,059,387	1,117,967
Fair Value
Maturing within one year	6,446
Maturing after one year through five years	18,245
Maturing after five years through 10 years	21,240
Maturing after 10 years	861,583
Debt Securities, Held-to-maturity, Fair Value	$ 907,514	$ 942,180