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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Effect of cash flow hedging and fair value (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | $ 163,846 | $ 149,420
Securities and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 24,878 | 24,762
Deposits |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 61,696 | 38,232
Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 13,189 | 18,275
Non-interest Income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 36,888 | 35,829
Interest rate swap on wholesale funding | Cash flow hedges | Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on cash flow hedges: | 3,020 | 3,062
Interest rate swap on variable rate loans | Cash flow hedges | Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on cash flow hedges: | (2,269) | (2,167)
Interest rate swap on securities | Fair Value Hedging | Securities and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on fair value hedges: | $ 1,429 | $ 1,359

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