SECURITIES (Securities available for sale debt maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Amortized Cost
Due in 1 year or less	$ 6,008
Due in 1 to 5 years	57,089
Due in 5 to 10 years	28,718
Due after 10 years	881,861
Total debt securities	973,676
Mortgage and asset-backed securities	3,399,950
Equity securities with a readily determinable fair value	22,117
Total investment securities	4,395,743
Estimated Fair Value
Due in 1 year or less	5,941
Due in 1 to 5 years	55,615
Due in 5 to 10 years	26,262
Due after 10 years	792,523
Estimated Fair Value	880,341
Mortgage and asset-backed securities	3,154,877
Equity securities with a readily determinable fair value	22,117	$ 21,056
Total investment securities	$ 4,057,335