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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Apr. 30, 2020 USD ($) item	Nov. 30, 2019 USD ($) item	Mar. 31, 2019 USD ($) item	Dec. 31, 2014 USD ($) item
Derivative [Line Items]
Acquisition, conversion and other expenses			$ 5,801	$ 8,317	$ 1,728
Notional amount of interest rate swap	$ 876,603	$ 580,372	876,603	$ 580,372
Interest rate swap on deposits
Derivative [Line Items]
Derivative, Number of Instruments Held | item						1	2	2
Acquisition, conversion and other expenses	3,900
Term of interest rate swap				5 years
Notional amount of interest rate swap	$ 50,000		$ 50,000			$ 25,000	$ 50,000	$ 50,000
Fixed interest rate, weighted average	2.46%		2.46%			0.59%	1.53%	2.46%
Cash flow hedges | Interest rate cap agreements
Derivative [Line Items]
Derivative, Number of Instruments Held | item									4
Premiums paid									$ 4,600
Cap interest rate									3.00%
Effective percentage interest rate, maximum									3.00%
Acquisition, conversion and other expenses		3,200
Fair Value Hedging | Interest rate swap on deposits
Derivative [Line Items]
Derivative, Number of Instruments Held | item	8		8
Notional amount of interest rate swap	$ 37,200		$ 37,200
Fixed interest rate, weighted average	1.697%		1.697%
Designated as hedging instrument | Cash flow hedges
Derivative [Line Items]
Notional amount of interest rate swap	$ 75,000	100,000	$ 75,000	$ 100,000
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 deposits
Derivative [Line Items]
Notional amount of interest rate swap		100,000		100,000
Designated as hedging instrument | Fair Value Hedging
Derivative [Line Items]
Notional amount of interest rate swap	37,190	37,190	37,190	37,190
Designated as hedging instrument | Fair Value Hedging | Interest rate swap on deposits
Derivative [Line Items]
Notional amount of interest rate swap	$ 37,190	$ 37,190	$ 37,190	$ 37,190

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Average fixed interest rate related to the group of interest rate derivatives.

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Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

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The number of derivative instruments of a particular group held by the entity.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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