LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowances by Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2023		Jun. 30, 2023	Dec. 31, 2022		Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Allowance for loan losses
Individually evaluated for impairment	$ 1,119			$ 1,147
Collectively evaluated for impairment	19,133			18,512
Total ending allowance balance	20,252	[1]	$ 20,172	19,659	[1]	$ 18,631	$ 17,485	$ 21,025
Loans:
Loans individually analyzed	4,999			7,482
Loans collectively analyzed	1,925,689			1,821,966
Total loans, net of deferred loan fees and costs	1,930,688			1,829,448
Collateral Pledged
Allowance for loan losses
Total ending allowance balance	241
Loans:
Loans individually analyzed	4,133
Commercial and Agricultural
Allowance for loan losses
Individually evaluated for impairment	1,089			1,078
Collectively evaluated for impairment	3,057			2,295
Total ending allowance balance	4,146		4,121	3,373		3,515	3,564	3,591
Loans:
Loans individually analyzed	1,174			2,112
Loans collectively analyzed	253,310			250,181
Total loans, net of deferred loan fees and costs	254,484			252,293
Commercial Mortgages
Allowance for loan losses
Individually evaluated for impairment	30			38
Collectively evaluated for impairment	10,995			11,538
Total ending allowance balance	11,025		10,994	11,576		10,986	10,314	13,556
Loans:
Loans individually analyzed	3,825			4,383
Loans collectively analyzed	1,082,708			992,530
Total loans, net of deferred loan fees and costs	1,086,533			996,913
Residential Mortgages
Allowance for loan losses
Individually evaluated for impairment	0			0
Collectively evaluated for impairment	1,868			1,845
Total ending allowance balance	1,868		1,905	1,845		1,796	1,714	1,803
Loans:
Loans individually analyzed	0			723
Loans collectively analyzed	281,361			284,949
Total loans, net of deferred loan fees and costs	281,361			285,672
Consumer Loans
Allowance for loan losses
Individually evaluated for impairment	0			31
Collectively evaluated for impairment	3,213			2,834
Total ending allowance balance	3,213		$ 3,152	2,865		$ 2,334	$ 1,893	$ 2,075
Loans:
Loans individually analyzed	0			264
Loans collectively analyzed	308,310			294,306
Total loans, net of deferred loan fees and costs	$ 308,310			$ 294,570

[1] Effective January 1, 2023, the allowance calculation is based upon Current Expected Credit loss methodology. Prior to January 1, 2023, the allowance calculation was based upon incurred loss methodology. Refer to Note 1 for further discussion.