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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Effect of cash flow hedging and fair value (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Income and expense line items presented in the consolidated statements of income | $ 48,426 | $ 42,042 | $ 132,956 | $ 122,146
Securities and other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Income and expense line items presented in the consolidated statements of income | 6,355 | 6,538 | 17,112 | 19,095
Deposits |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Income and expense line items presented in the consolidated statements of income | 16,419 | 16,174 | 47,442 | 45,486
Borrowings |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Income and expense line items presented in the consolidated statements of income | 2,544 | 3,448 | 8,845 | 10,983
Non-interest Income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Income and expense line items presented in the consolidated statements of income | 10,567 | 9,653 | 24,131 | 27,496
Interest rate swap on wholesale funding | Cash flow hedges | Borrowings |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) on cash flow hedges: |  | 828 | 269 | 2,483
Interest rate swap on variable rate loans | Cash flow hedges | Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) on cash flow hedges: | (466) | (588) | (1,380) | (1,758)
Interest rate swap on securities | Fair Value Hedging | Securities and other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) on fair value hedges: | $ 281 | $ 372 | $ 834 | $ 1,113

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