SECURITIES (Available-for-sale Securities, Debt Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in 1 year or less	$ 490
Due in 1 to 5 years	87,069
Due in 5 to 10 years	53,649
Due after 10 years	1,049,381
Total debt securities	1,190,589
Mortgage and asset-backed securities	5,577,826
Equity securities with a readily determinable fair value	20,314	$ 20,788
Total investment securities	6,788,729
Estimated Fair Value
Due in 1 year or less	488
Due in 1 to 5 years	85,861
Due in 5 to 10 years	45,795
Due after 10 years	880,069
Estimated Fair Value	1,012,213
Mortgage and asset-backed securities	5,114,617
Equity securities with a readily determinable fair value	20,314
Total investment securities	$ 6,147,144