LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowances For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2023		Jun. 30, 2022	Jun. 30, 2023		Jun. 30, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 20,075		$ 19,928	$ 19,659	[1]	$ 21,025
Charge-offs	(251)		(831)	(636)		(1,029)
Recoveries	105		132	221		378
Net recoveries (charge-offs)	(146)		(699)	(415)		(651)
Provision	243		(1,744)	554		(2,889)
Ending balance	20,172	[1]	17,485	20,172	[1]	17,485
Credit provision related to off-balance sheet exposure	7			41
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	4,053		3,485	3,373		3,591
Charge-offs	(9)		(16)	(199)		(20)
Recoveries	3		23	8		30
Net recoveries (charge-offs)	(6)		7	(191)		10
Provision	74		72	30		(37)
Ending balance	4,121		3,564	4,121		3,564
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	10,983		12,963	11,576		13,556
Charge-offs	0		(687)	0		(687)
Recoveries	1		1	1		2
Net recoveries (charge-offs)	1		(686)	1		(685)
Provision	10		(1,963)	112		(2,557)
Ending balance	10,994		10,314	10,994		10,314
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	1,892		1,606	1,845		1,803
Charge-offs	0		0	0		0
Recoveries	0		0	0		0
Net recoveries (charge-offs)	0		0	0		0
Provision	13		108	76		(89)
Ending balance	1,905		1,714	1,905		1,714
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	3,147		1,874	2,865		2,075
Charge-offs	(242)		(128)	(437)		(322)
Recoveries	101		108	212		346
Net recoveries (charge-offs)	(141)		(20)	(225)		24
Provision	146		39	336		(206)
Ending balance	3,152		1,893	3,152		1,893
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	1,048		0	0		0
Provision	(7)		0	(41)		0
Ending balance	1,041		0	1,041		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.