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INVESTMENT SECURITIES (Schedule of Amortized Cost and Fair Value of Securities Classified by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Held-to-maturity Securities, Amortized Cost
After 1 year through 5 years	$ 37,979	$ 29,852
After 5 years though 10 years	1,177	9,505
After 10 years	439,730	471,068
Amortized Cost, total	478,886	510,425
Held-to-maturity Securities, Fair Value
After 1 year through 5 years	34,596	27,630
After 5 years though 10 years	1,064	8,130
After 10 years	360,598	401,530
Fair Value, total	396,258	437,290
Available-for-sale Securities, Amortized Cost
After 1 year through 5 years	66,096	54,736
After 5 years though 10 years	22,658	36,043
After 10 years	441,342	443,886
Amortized Cost, total	530,096	534,665
Available-for-sale Securities, Fair Value
After 1 year through 5 years	59,274	48,959
After 5 years though 10 years	20,591	32,872
After 10 years	349,985	363,916
Fair Value, total	429,850	445,747
Asset Pledged as Collateral
Available-for-sale Securities, Fair Value
Securities pledged	3,300,000	2,400,000
Asset Pledged as Collateral | FRB
Available-for-sale Securities, Fair Value
Securities pledged	$ 789,500	$ 25,000

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