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DERIVATIVES - Cash flow hedge accounting (Details) - Derivatives designated as hedges - Interest rate swaps and caps related to customer deposits and borrowings - Cash flow hedge - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount of gain (loss) recognized in OCI, net of tax | $ 509 | $ (190) | $ 4,517 | $ 7,574
Amount of gain (loss) reclassified from OCI into income | $ 1,200 | $ 782 | $ 3,653 | $ 782
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] | Licensing Fees |  | Licensing Fees |

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