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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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