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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Apr. 30, 2020 USD ($)	Dec. 31, 2019 USD ($) item	Nov. 30, 2019 USD ($)
Derivative [Line Items]
Acquisition, conversion and other expenses	$ 31	$ 318	$ 356	$ 1,759
Notional amount of interest rate swap	770,510		770,510		$ 943,623
Interest rate swap on variable rate loans
Derivative [Line Items]
Variable rate loan assets	$ 50,000		$ 50,000
Interest rate swap on variable rate loans | London Interbank Offered Rate Less Two Days
Derivative [Line Items]
Variable interest rate	0.806%		0.806%
Interest rate swap on deposits
Derivative [Line Items]
Derivative, Number of Instruments Held | item	2		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		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		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		50,000
Designated as hedging instrument | Fair Value Hedging
Derivative [Line Items]
Notional amount of interest rate swap	37,190		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		$ 37,190		$ 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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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