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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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Nominal or face amount used to calculate payments on the derivative asset.

+ References

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+ References

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