DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Fair Values of Derivative Instruments on the Balance Sheet (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Collateral already posted	$ 4,470	$ 350
Loss recognized in income from fair value adjustment	15	29
Loss recognized in income from fee income	0		$ 960
Interest Rate Products \| Not Designated as Hedging Instrument
Other Assets
Notional Amount	76,883	77,534	49,664
Fair Value	4,278	1,784	983
Other Liabilities
Notional Amount	76,883	77,534	49,664
Fair Value	$ (4,322)	$ (1,843)	$ (1,013)

Derivative, Loss on Derivative, Fee Income

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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