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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, 2023 | Dec. 31, 2022
--- | --- | ---
Fair value measurement |  |
Fair Value | $ 1,259,137 | $ 1,330,481
U.S. Government agencies |  |
Fair value measurement |  |
Fair Value | 91,440 | 98,473
Mortgage Backed Securities - residential |  |
Fair value measurement |  |
Fair Value | 569,885 | 620,248
Mortgage Backed Securities - commercial |  |
Fair value measurement |  |
Fair Value | 7,483 | 9,677
Collateralized mortgage obligations |  |
Fair value measurement |  |
Fair Value | 180,829 | 203,485
State and municipal |  |
Fair value measurement |  |
Fair Value | 370,811 | 360,153
Municipal taxable |  |
Fair value measurement |  |
Fair Value | 34,285 | 32,515
U.S. Treasury |  |
Fair value measurement |  |
Fair Value | 1,402 | 2,944
Collateralized debt obligations |  |
Fair value measurement |  |
Fair Value | 3,002 | 2,986
Level 1 |  |
Fair value measurement |  |
Fair Value | 0 | 0
Level 2 |  |
Fair value measurement |  |
Fair Value | 1,254,955 | 1,325,950
Derivative Assets | 2,878 | 2,838
Derivative Liabilities | (2,878) | (2,838)
Level 2 | U.S. Government agencies |  |
Fair value measurement |  |
Fair Value | 91,440 | 98,473
Level 2 | Mortgage Backed Securities - residential |  |
Fair value measurement |  |
Fair Value | 569,885 | 620,248
Level 2 | Mortgage Backed Securities - commercial |  |
Fair value measurement |  |
Fair Value | 7,483 | 9,677
Level 2 | Collateralized mortgage obligations |  |
Fair value measurement |  |
Fair Value | 180,829 | 203,485
Level 2 | State and municipal |  |
Fair value measurement |  |
Fair Value | 369,631 | 358,608
Level 2 | Municipal taxable |  |
Fair value measurement |  |
Fair Value | 34,285 | 32,515
Level 2 | U.S. Treasury |  |
Fair value measurement |  |
Fair Value | 1,402 | 2,944
Level 3 |  |
Fair value measurement |  |
Fair Value | 4,182 | 4,531
Level 3 | State and municipal |  |
Fair value measurement |  |
Fair Value | 1,180 | 1,545
Level 3 | Collateralized debt obligations |  |
Fair value measurement |  |
Fair Value | $ 3,002 | $ 2,986

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