LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowances For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023		Mar. 31, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 19,659	[1]	$ 21,025
Charge-offs	(383)		(198)
Recoveries	114		246
Net recoveries (charge-offs)	(269)		48
Provision	311		(1,145)
Ending balance	20,075	[1]	19,928
Credit provision related to off-balance sheet exposure	34
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	3,373		3,591
Charge-offs	(190)		(4)
Recoveries	6		6
Net recoveries (charge-offs)	(184)		2
Provision	(45)		(110)
Ending balance	4,053		3,483
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	11,576		13,556
Charge-offs	0		0
Recoveries	0		1
Net recoveries (charge-offs)	0		1
Provision	102		(593)
Ending balance	10,983		12,964
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	1,845		1,803
Charge-offs	0		0
Recoveries	0		0
Net recoveries (charge-offs)	0		0
Provision	63		(197)
Ending balance	1,892		1,606
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	2,865		2,075
Charge-offs	(193)		(194)
Recoveries	108		239
Net recoveries (charge-offs)	(85)		45
Provision	191		(245)
Ending balance	3,147		1,875
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	0		0
Provision	(34)		0
Ending balance	1,048		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	$ 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.