LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowances For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 20,172		$ 17,485	$ 19,659	[1]	$ 21,025
Charge-offs	(431)		(277)	(1,066)		(1,306)
Recoveries	75		168	295		546
Net recoveries (charge-offs)	(356)		(109)	(771)		(760)
Provision	436		1,255	990		(1,634)
Ending balance	20,252	[1]	18,631	20,252	[1]	18,631
Credit (reversal) expense related to off-balance sheet exposure	(13)			(28)
Cumulative effect adjustment for the adoption of ASC 326
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				374
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				20,033
Commercial and Agricultural
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,121		3,564	3,373		3,591
Charge-offs	(81)		0	(281)		(20)
Recoveries	4		6	13		37
Net recoveries (charge-offs)	(77)		6	(268)		17
Provision	102		(55)	132		(93)
Ending balance	4,146		3,515	4,146		3,515
Commercial and Agricultural | Cumulative effect adjustment for the adoption of ASC 326
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				909
Commercial and Agricultural | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				4,282
Commercial Mortgages
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	10,994		10,314	11,576		13,556
Charge-offs	0		0	0		(687)
Recoveries	1		1	1		3
Net recoveries (charge-offs)	1		1	1		(684)
Provision	30		671	143		(1,886)
Ending balance	11,025		10,986	11,025		10,986
Commercial Mortgages | Cumulative effect adjustment for the adoption of ASC 326
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				(695)
Commercial Mortgages | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				10,881
Residential Mortgages
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,905		1,714	1,845		1,803
Charge-offs	0		0	0		0
Recoveries	0		40	0		40
Net recoveries (charge-offs)	0		40	0		40
Provision	(37)		42	39		(47)
Ending balance	1,868		1,796	1,868		1,796
Residential Mortgages | Cumulative effect adjustment for the adoption of ASC 326
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				(16)
Residential Mortgages | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				1,829
Consumer Loans
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,152		1,893	2,865		2,075
Charge-offs	(350)		(277)	(785)		(599)
Recoveries	70		121	281		466
Net recoveries (charge-offs)	(280)		(156)	(504)		(133)
Provision	341		597	676		392
Ending balance	3,213		2,334	3,213		2,334
Consumer Loans | Cumulative effect adjustment for the adoption of ASC 326
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				176
Consumer Loans | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				3,041
Unfunded Loan Commitment
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,041		0	0		0
Provision	13		0	(28)		0
Ending balance	1,054		0	1,054		0
Unfunded Loan Commitment | Cumulative effect adjustment for the adoption of ASC 326
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 0		$ 0	$ 1,082		$ 0

[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.