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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, 2023 | Dec. 31, 2022
Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | $ 149,420 | $ 107,797
Securities and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 24,762 | 18,729
Deposits |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 38,232 | 7,344
Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 18,275 | 5,501
Non-interest Income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 35,829 | 35,321
Interest rate swap on wholesale funding | Cash flow hedges | Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on cash flow hedges: | 3,062 | 475
Interest rate swap on variable rate loans | Cash flow hedges | Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on cash flow hedges: | (2,167) | (601)
Interest rate swap on securities | Fair Value Hedging | Securities and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on fair value hedges: | $ 1,359 | $ 140

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