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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 ($)	Sep. 30, 2023 USD ($) item	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Apr. 30, 2020 USD ($)	Dec. 31, 2019 USD ($) item	Nov. 30, 2019 USD ($)
Derivative [Line Items]
Acquisition, conversion and other expenses	$ 31	$ 20	$ 356
Notional amount of interest rate swap		778,555		$ 774,019
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 swap on variable rate loans
Derivative [Line Items]
Variable rate loan assets		50,000
Notional amount of interest rate swap		$ 50,000		50,000
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans | London Interbank Offered Rate Less Two Days
Derivative [Line Items]
Variable interest rate		0.806%
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans | SOFR
Derivative [Line Items]
Interest rate margin		0.11%
Designated as hedging instrument | Cash flow hedges | Interest rate swap on wholesale funding
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		$ 75,000		75,000	$ 25,000		$ 50,000
Designated as hedging instrument | Cash flow hedges | Interest rate swap on wholesale funding | SOFR
Derivative [Line Items]
Interest rate margin		0.26%
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						1.70%
Designated as hedging instrument | Economic hedges
Derivative [Line Items]
Notional amount of interest rate swap		$ 611,445		$ 611,829

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