LOANS AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total					$ 7,548
Impaired Financing Receivable, Recorded Investment [Abstract]
Total					7,522
Allowance for Loan Losses Allocated					1,147
Average Amortized Cost Basis
Average recorded investment, total	$ 5,468	$ 7,604	$ 6,307	$ 9,314
Interest Income Recognized
Total	7	18	25	38
Residential Mortgages
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance recorded					767
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded					760
Average Amortized Cost Basis
With no related allowance recorded	0	846	359	890
Interest Income Recognized
With no related allowance recorded	0	9	0	19
Construction | Commercial mortgages, other
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance recorded					5
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded					5
Average Amortized Cost Basis
With no related allowance recorded	0	55	2	88
Interest Income Recognized
With no related allowance recorded	0	0	0	0
Commercial mortgages, other | Commercial mortgages, other
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance recorded					4,346
With an allowance recorded					38
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded					4,341
With an allowance recorded					38
Allowance for Loan Losses Allocated					38
Average Amortized Cost Basis
With no related allowance recorded	3,863	4,150	4,052	4,171
With an allowance recorded	31	42	34	1,563
Interest Income Recognized
With no related allowance recorded	3	7	12	14
With an allowance recorded	0	0	0	0
Home equity lines & loans | Consumer Loans
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance recorded					154
With an allowance recorded					126
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded					138
With an allowance recorded					127
Allowance for Loan Losses Allocated					31
Average Amortized Cost Basis
With no related allowance recorded	51	149	123	157
With an allowance recorded	78	134	42	139
Interest Income Recognized
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Commercial and Agricultural Sector | Commercial and industrial
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance recorded					1,026
With an allowance recorded					1,086
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance recorded					1,025
With an allowance recorded					1,088
Allowance for Loan Losses Allocated					$ 1,078
Average Amortized Cost Basis
With no related allowance recorded	163	585	520	761
With an allowance recorded	1,268	1,643	1,168	1,545
Interest Income Recognized
With no related allowance recorded	0	0	0	0
With an allowance recorded	4	2	13	5
Commercial and Agricultural Sector | Agricultural
Average Amortized Cost Basis
With no related allowance recorded	0	0	0	0
With an allowance recorded	14	0	7	0
Interest Income Recognized
With no related allowance recorded	0	0	0	0
With an allowance recorded	$ 0	$ 0	$ 0	$ 0