SECURITIES (Available-for-sale Securities, Debt Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in 1 year or less	$ 25,138
Due in 1 to 5 years	62,537
Due in 5 to 10 years	20,231
Due after 10 years	899,369
Total debt securities	1,007,275
Mortgage and asset-backed securities	4,072,013
Equity securities with a readily determinable fair value	21,056
Total investment securities	5,100,344
Estimated Fair Value
Due in 1 year or less	24,897
Due in 1 to 5 years	61,413
Due in 5 to 10 years	18,036
Due after 10 years	801,716
Estimated Fair Value	906,062
Mortgage and asset-backed securities	3,719,773
Equity securities with a readily determinable fair value	21,056	$ 20,314
Total investment securities	$ 4,646,891