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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) item	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) item	Apr. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($) item	Nov. 30, 2019	Mar. 31, 2019
Derivative [Line Items]
Acquisition, conversion and other expenses	$ 889		$ 103
Notional amount of interest rate swap	960,461	$ 876,603		$ 876,603
Interest rate swap on variable rate loans
Derivative [Line Items]
Variable rate loan assets	$ 50,000
Interest rate swap on variable rate loans | LIBOR 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		2	1
Acquisition, conversion and other expenses		$ 3,900
Term of interest rate swap				5 years
Fixed rate of interest rate swap					0.59%		1.53%	2.46%
Notional amount of interest rate swap	$ 50,000	$ 50,000		$ 50,000	$ 25,000
Fixed interest rate, weighted average		2.46%		2.46%
Designated as hedging instrument | Cash flow hedges
Derivative [Line Items]
Notional amount of interest rate swap	125,000	$ 75,000		$ 75,000
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
Designated as hedging instrument | Fair value hedges
Derivative [Line Items]
Notional amount of interest rate swap	37,190	37,190		37,190
Designated as hedging instrument | Fair value hedges | 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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-SubTopic 10
-Section 50
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