INVESTMENT SECURITIES (Schedule of Amortized Cost and Fair Value of Securities Classified by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Held-to-maturity Securities, Amortized Cost
Due within 1 year	$ 24,865
After 1 year through 5 years	29,874	$ 29,852
After 5 years though 10 years	9,345	9,505
After 10 years	451,529	471,068
Amortized Cost, total	515,613	510,425
Held-to-maturity Securities, Fair Value
Due within 1 year	24,872
After 1 year through 5 years	27,756	27,630
After 5 years though 10 years	7,880	8,130
After 10 years	381,925	401,530
Fair Value, total	442,433	437,290
Available-for-sale Securities, Amortized Cost
After 1 year through 5 years	66,000	54,736
After 5 years though 10 years	23,371	36,043
After 10 years	424,115	443,886
Amortized Cost, total	513,486	534,665
Available-for-sale Securities, Fair Value
After 1 year through 5 years	59,006	48,959
After 5 years though 10 years	21,822	32,872
After 10 years	345,240	363,916
Fair Value, total	426,068	445,747
Asset Pledged as Collateral
Available-for-sale Securities, Fair Value
Securities pledged	3,400,000	2,400,000
Asset Pledged as Collateral | FRB
Available-for-sale Securities, Fair Value
Securities pledged	$ 941,700	$ 25,000