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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) item	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) item	Apr. 30, 2020 USD ($)	Nov. 30, 2019 USD ($)
Derivative [Line Items]
Acquisition, conversion and other expenses	$ 325	$ 889
Notional amount of interest rate swap	$ 856,491		$ 943,623
Interest rate swap on variable rate loans
Derivative [Line Items]
Variable rate loan assets		$ 50,000
Interest rate swap on variable rate loans | London Interbank Offered Rate Less Two Days
Derivative [Line Items]
Variable interest rate		0.806%
Interest rate swap on deposits
Derivative [Line Items]
Derivative, Number of Instruments Held | item	2
Term of interest rate swap	5 years
Fixed rate of interest rate swap					0.59%	1.53%
Notional amount of interest rate swap					$ 25,000	$ 50,000
Designated as hedging instrument | Cash flow hedges
Derivative [Line Items]
Notional amount of interest rate swap	$ 125,000		125,000
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements
Derivative [Line Items]
Notional amount of interest rate swap	75,000		75,000
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans
Derivative [Line Items]
Notional amount of interest rate swap	50,000		50,000
Designated as hedging instrument | Fair Value Hedging
Derivative [Line Items]
Notional amount of interest rate swap	37,190		37,190
Designated as hedging instrument | Fair Value Hedging | Interest rate swap on deposits
Derivative [Line Items]
Derivative, Number of Instruments Held | item				8
Notional amount of interest rate swap	$ 37,190		$ 37,190	$ 37,200
Fixed interest rate, weighted average				1.696%

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

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Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

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