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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($) item	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) item	Apr. 30, 2020 USD ($) item	Nov. 30, 2019	Mar. 31, 2019	Dec. 31, 2014 USD ($) item
Derivative [Line Items]
Acquisition, conversion and other expenses	$ 691		$ 3,039	$ 952	$ 3,319
Notional amount of interest rate swap	822,929	$ 580,372		822,929		$ 580,372
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
Interest rate swap
Derivative [Line Items]
Derivative, Number of Instruments Held | item		2				2	1
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	$ 25,000
Designated as hedging instrument | Cash flow hedges
Derivative [Line Items]
Notional amount of interest rate swap	125,000	100,000		125,000		100,000
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements
Derivative [Line Items]
Notional amount of interest rate swap	125,000	100,000		125,000		100,000
Designated as hedging instrument | Fair value hedges
Derivative [Line Items]
Notional amount of interest rate swap	37,190	$ 37,190		37,190		$ 37,190
Designated as hedging instrument | Fair value hedges | Interest rate swap
Derivative [Line Items]
Derivative, Number of Instruments Held | item		8				8
Notional amount of interest rate swap	$ 37,190	$ 37,190		$ 37,190		$ 37,190
Fixed interest rate, weighted average		1.696%				1.696%

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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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Fixed interest rate related to the interest rate derivative.

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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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