DERIVATIVES - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative [Line Items]
Net interest income (expense)	$ 36,515,000	$ 45,525,000	$ 119,414,000	$ 128,040,000
Swap valuation allowance				673,000
Accrued interest receivable	22,889,000		22,889,000		$ 25,157,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	310,000,000		310,000,000		290,000,000
Unrealized after-tax gain of accumulated other comprehensive income (loss)		167,000
Unrealized gain			13,109,000		3,290,000
Net interest income (expense)	1,500,000	$ (11,000)	3,500,000	$ (1,700,000)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Notional amount	310,000,000		310,000,000		290,000,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	580,640,000		580,640,000		612,211,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Accrued interest payable	$ 343,000		$ 343,000		$ 1,100,000