DERIVATIVES AND HEDGING ACTIVITIES - Summary of interest-rate swaps designated as cash flow hedges (Details) - Interest Rate Swap - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amounts	$ 259,000,000	$ 109,000,000
Weighted average pay rates	2.91%	1.46%
Weighted average receive rates	5.43%	4.61%
Weighted average maturity (in years)	3 years 4 months 24 days	4 years 2 months 12 days
Unrealized gains, net	$ 14,350,000	$ 11,091,000
Other Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gains, net	14,350,000	11,091,000
Other Liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gains, net	$ 0	$ 0