LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowances by Impairment (Details) - USD ($) $ in Thousands	Jun. 30, 2023		Mar. 31, 2023	Dec. 31, 2022		Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Allowance for loan losses
Individually evaluated for impairment	$ 1,090			$ 1,147
Collectively evaluated for impairment	19,082			18,512
Total ending allowance balance	20,172	[1]	$ 20,075	19,659	[1]	$ 17,485	$ 19,928	$ 21,025
Loans:
Loans individually analyzed	5,937			7,482
Loans collectively analyzed	1,887,969			1,821,966
Total loans, net of deferred loan fees and costs	1,893,906			1,829,448
Collateral Pledged
Allowance for loan losses
Total ending allowance balance	250
Loans:
Loans individually analyzed	5,096
Commercial and Agricultural
Allowance for loan losses
Individually evaluated for impairment	996			1,078
Collectively evaluated for impairment	3,125			2,295
Total ending allowance balance	4,121		4,053	3,373		3,564	3,485	3,591
Loans:
Loans individually analyzed	1,714			2,112
Loans collectively analyzed	252,092			250,181
Total loans, net of deferred loan fees and costs	253,806			252,293
Commercial Mortgages
Allowance for loan losses
Individually evaluated for impairment	33			38
Collectively evaluated for impairment	10,961			11,538
Total ending allowance balance	10,994		10,983	11,576		10,314	12,963	13,556
Loans:
Loans individually analyzed	3,964			4,383
Loans collectively analyzed	1,044,563			992,530
Total loans, net of deferred loan fees and costs	1,048,527			996,913
Residential Mortgages
Allowance for loan losses
Individually evaluated for impairment	0			0
Collectively evaluated for impairment	1,905			1,845
Total ending allowance balance	1,905		1,892	1,845		1,714	1,606	1,803
Loans:
Loans individually analyzed	0			723
Loans collectively analyzed	285,084			284,949
Total loans, net of deferred loan fees and costs	285,084			285,672
Consumer Loans
Allowance for loan losses
Individually evaluated for impairment	61			31
Collectively evaluated for impairment	3,091			2,834
Total ending allowance balance	3,152		$ 3,147	2,865		$ 1,893	$ 1,874	$ 2,075
Loans:
Loans individually analyzed	259			264
Loans collectively analyzed	306,230			294,306
Total loans, net of deferred loan fees and costs	$ 306,489			$ 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.