SECURITIES (Securities available for sale debt maturities) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in 1 year or less	$ 17,299
Due in 1 to 5 years	70,602
Due in 5 to 10 years	48,317
Due after 10 years	989,725
Total debt securities	1,125,943
Mortgage and asset-backed securities	5,268,957
Equity securities with a readily determinable fair value	20,688	$ 20,314
Total investment securities	6,415,588
Estimated Fair Value
Due in 1 year or less	16,935
Due in 1 to 5 years	68,532
Due in 5 to 10 years	40,477
Due after 10 years	854,421
Estimated Fair Value	980,365
Mortgage and asset-backed securities	4,796,988
Equity securities with a readily determinable fair value	20,688
Total investment securities	$ 5,798,041