ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan workout and OREO (recoveries) expenses	$ (189)	$ 1,001	$ 292	$ 1,103
Troubled debt restructuring related reserves					$ 600
Usual sustained repayment performance period			6 months
Various Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused commitments to extend credit	4,800		$ 4,800
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans in the process of foreclosure | loan			33		45
Total loans outstanding			$ 3,800		$ 6,700
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans in the process of foreclosure | loan			14		8
Total loans outstanding			$ 3,600		$ 1,600
Residential and Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan workout and OREO (recoveries) expenses	$ (300)	$ 300	$ 100	$ 500
Impairment loans, charge off period			90 days