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DERIVATIVES - Cash flow hedge accounting (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Interest rate caps related to customer deposits |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional amount, derivative asset |  |  | $ 300,000
Derivatives designated as hedging instruments | Interest rate caps related to customer deposits |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional amount, derivative asset | $ 300,000 | $ 300,000 |
Fair value | 12,076 | 3,385 |
Derivatives designated as hedging instruments | Other assets. |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional amount, derivative asset | 300,000 | 300,000 |
Fair value | $ 12,076 | $ 3,385 |

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