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FAIR VALUES OF FINANCIAL INSTRUMENTS - Fair Value of Derivatives as of Measurement Date (Level 2 Inputs) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair value measurement |  |
Securities available-for-sale | $ 1,330,481 | $ 1,359,514
Fair Value | 1,330,481 | 1,359,514
U.S. Government agencies |  |
Fair value measurement |  |
Fair Value | 98,473 | 120,123
Mortgage Backed Securities - residential |  |
Fair value measurement |  |
Fair Value | 620,248 | 626,428
Mortgage Backed Securities - commercial |  |
Fair value measurement |  |
Fair Value | 9,677 | 15,671
Collateralized Mortgage Obligations |  |
Fair value measurement |  |
Fair Value | 203,485 | 175,005
State and municipal obligations |  |
Fair value measurement |  |
Fair Value | 360,153 | 380,098
Municipal taxable |  |
Fair value measurement |  |
Fair Value | 32,515 | 38,626
U.S. Treasury |  |
Fair value measurement |  |
Fair Value | 2,944 | 204
Collateralized debt obligations |  |
Fair value measurement |  |
Fair Value | 2,986 | 3,359
Level 1 |  |
Fair value measurement |  |
Fair Value | 0 | 0
Level 2 |  |
Fair value measurement |  |
Derivative Assets | 2,838 | 1,030
Derivative Liabilities | (2,838) | (1,030)
Fair Value | 1,325,950 | 1,354,260
Level 2 | U.S. Government agencies |  |
Fair value measurement |  |
Fair Value | 98,473 | 120,123
Level 2 | Mortgage Backed Securities - residential |  |
Fair value measurement |  |
Fair Value | 620,248 | 626,428
Level 2 | Mortgage Backed Securities - commercial |  |
Fair value measurement |  |
Fair Value | 9,677 | 15,671
Level 2 | Collateralized Mortgage Obligations |  |
Fair value measurement |  |
Fair Value | 203,485 | 175,005
Level 2 | State and municipal obligations |  |
Fair value measurement |  |
Fair Value | 358,608 | 378,203
Level 2 | Municipal taxable |  |
Fair value measurement |  |
Fair Value | 32,515 | 38,626
Level 2 | U.S. Treasury |  |
Fair value measurement |  |
Fair Value | 2,944 | 204
Level 3 |  |
Fair value measurement |  |
Fair Value | 4,531 | 5,254
Level 3 | State and municipal obligations |  |
Fair value measurement |  |
Fair Value | 1,545 | 1,895
Level 3 | Collateralized debt obligations |  |
Fair value measurement |  |
Fair Value | $ 2,986 | $ 3,359

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