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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
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Mar. 31, 2023 | Mar. 31, 2022
Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | $ 34,560 | $ 22,671
Securities and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 5,791 | 3,826
Deposits |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 5,265 | 1,189
Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 4,180 | 1,010
Non-interest Income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 9,184 | 9,309
Interest rate swap on wholesale funding | Cash flow hedges | Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on cash flow hedges: | 664 | (113)
Interest rate swap on variable rate loans | Cash flow hedges | Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on cash flow hedges: | (466) | 16
Interest rate swap on securities | Fair Value Hedging | Securities and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on fair value hedges: | $ 286 | $ (135)

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