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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, 2021 | Dec. 31, 2020
Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | $ 95,236 | $ 107,085
Securities and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 15,568 | 19,019
Deposits |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 8,543 | 18,043
Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 6,688 | 8,881
Non-interest Income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Income and expense line items presented in the consolidated statements of income | 42,261 | 42,956
Interest rate swap on wholesale funding | Cash flow hedges | Deposits |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on cash flow hedges: | (669) | (793)
Interest rate swap on wholesale funding | Cash flow hedges | Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on cash flow hedges: | (58) | (37)
Interest rate swap on variable rate loans | Cash flow hedges | Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on cash flow hedges: | 211 |
Interest rate swap on securities | Fair Value Hedging | Securities and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on fair value hedges: | $ (566) | $ (281)

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