DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedges (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) item	Sep. 30, 2022 USD ($)	Feb. 28, 2023 USD ($)	Jul. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Oct. 31, 2018 USD ($)
DERIVATIVES AND HEDGING ACTIVITIES
USD-Prime rate				8.50%
USD-SOFR OIS rate				5.31663%
Non-interest income related to changes in the fair value		$ 0	$ 0	$ 0	$ 0
Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Loan interest income on terminated interest rate swap		$ 2,000,000.0	2,000,000.0	$ 6,100,000	6,100,000
Interest rate swaps | Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Total notional amount of the swaps								$ 300,000,000	$ 400,000,000
Derivative, fixed interest rate								1.6725%	3.018%
Terminated notional amount of derivatives	$ 400,000,000
Expected interest income on termination	$ 45,900,000
Floating rate of interest		5.431%		5.431%
Interest rate swaps | Fair Value Hedges
DERIVATIVES AND HEDGING ACTIVITIES
Total notional amount of the swaps						$ 95,000,000
Derivative, fixed interest rate						4.65%
Interest rate swap one | Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Total notional amount of the swaps							$ 200,000,000
Derivative, fixed interest rate							2.628%
Interest rate swap two | Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Total notional amount of the swaps							$ 200,000,000
Derivative, fixed interest rate							5.725%
March 2022 interest rate swap | Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Loan interest income expense		$ 2,800,000	$ 428,000	$ 7,500,000	$ 610,000
July 2022 interest rate swaps | Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Loan interest income expense		$ 2,700,000		$ 4,400,000
Number of loans | item				2