INVESTMENT SECURITIES (Schedule of Amortized Cost and Fair Value of Securities Classified by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
After 1 year through 5 years	$ 29,863	$ 29,852
After 5 years though 10 years	9,428	9,505
After 10 years	462,234	471,068
Amortized Cost, total	501,525	510,425
Fair Value
After 1 year through 5 years	28,009	27,630
After 5 years though 10 years	8,195	8,130
After 10 years	399,927	401,530
Fair Value, total	436,131	437,290
Amortized Cost
After 1 year through 5 years	64,575	54,736
After 5 years though 10 years	25,554	36,043
After 10 years	434,725	443,886
Amortized Cost, total	524,854	534,665
Fair Value
After 1 year through 5 years	58,161	48,959
After 5 years though 10 years	24,246	32,872
After 10 years	361,762	363,916
Fair Value, total	444,169	445,747
Asset Pledged as Collateral
Fair Value
Securities pledged	3,200,000	2,400,000
Asset Pledged as Collateral | FRB
Fair Value
Securities pledged	$ 921,500	$ 25,000