DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) item	Jun. 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	$ 552	$ 325	$ 1,441
Notional amount of interest rate swap		770,234		$ 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%