LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) item	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($) loan	Sep. 30, 2024 USD ($) item	Sep. 30, 2023 USD ($) loan	Dec. 31, 2023 USD ($) loan
Loans Receivable Held-for-sale, Amount	$ 426,000			$ 426,000		$ 214,000
Unpaid principal balance	934,599,000		$ 881,038,000	$ 934,599,000	$ 881,038,000	911,078,000
Loan payments of delinquency period				10 days
Delinquency notice is automatically generated				10 or 15
Loan Payments, Delinquency Period, Beyond Which Loans are Considered Non-Accrual				90 days
Reserve for unfunded lending commitments	173,000		$ 233,000	$ 173,000	$ 233,000
Accrued interest exclude from the amortized cost basis of loans	2,542,000			2,542,000		2,476,000
Foreclosed Assets Held For Resale	0			0		0
Consumer Mortgage Loans Secured by Residential Real Estate in Process of Foreclosure	134,000			134,000		$ 138,000
Financing Receivable, Modifications, Recorded Investment	9,547,000			9,547,000
Loan carrying a post modification recorded investment, paid current	9,455,000			9,455,000
Financing Receivable, Modifications, Unfunded Commitments				0
Modified value of TDR	$ 120,000	$ 9,455,000		$ 9,575,000
Number of TDRs not in compliance with restructure | item	0			0
Number of financing receivable modified | loan			0		0	0
Recorded Investment	$ 120,000			$ 9,547,000		$ 0
Impaired Financing Receivable, Interest Income, Accrual Method	2,000			2,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 120,000	$ 9,455,000		$ 9,575,000
Number of loans modified as troubled debt restructuring within previous 12 months, with subsequent payment default | item	0			0
GGLs
Unpaid principal balance	$ 4,338,000			$ 4,338,000		4,470,000
Unfunded Loan Commitment
Reserve for unfunded lending commitments	$ 173,000			173,000		166,000
Term Modification
Period of maturity date extension	10 months
Commercial and Industrial
Unpaid principal balance	$ 66,804,000		$ 62,866,000	66,804,000	$ 62,866,000	66,909,000
Reserve for unfunded lending commitments	23,000		25,000	23,000	25,000
Commercial and Industrial | GGLs
Government Guaranteed Loans.	4,338,000			4,338,000		4,470,000
Commercial and Industrial | Unfunded Loan Commitment
Reserve for unfunded lending commitments						25,000
State and Political Subdivisions
Unpaid principal balance	24,408,000		27,120,000	24,408,000	27,120,000	26,181,000
Reserve for unfunded lending commitments	1,000		1,000	1,000	1,000
Tax free loans	$ 24,408,000			$ 24,408,000		26,181,000
State and Political Subdivisions | Unfunded Loan Commitment
Reserve for unfunded lending commitments						1,000
Commercial Real Estate | Maximum
Term of loan offering				20 years
Maximum loan to value ratio				80.00%
Residential Real Estate | Residential Mortgage
Maximum loan to value ratio				80.00%
Loans held for sale term	30 years			30 years
Maximum loan to value ratio with PMI	95.00%			95.00%
Residential Real Estate | Residential Mortgage | Maximum
Term of loan offering				20 years
Loans held for sale term	30 years			30 years
Residential Real Estate | Home Equity Loan
Maximum loan to value ratio				80.00%
Residential Real Estate | Home Equity Loan | Maximum
Term of loan offering				15 years
Residential Real Estate | Home Equity Line of Credit
Maximum loan to value ratio				80.00%
Residential Real Estate | Home Equity Line of Credit | Maximum
Term of loan offering				20 years
Consumer
Unpaid principal balance	$ 6,166,000		6,218,000	$ 6,166,000	6,218,000	5,824,000
Agricultural
Unpaid principal balance	1,008,000		708,000	$ 1,008,000	708,000	671,000
Agricultural | Maximum
Term of loan offering				10 years
Maximum loan to value ratio				70.00%
Real Estate
Loans Receivable Held-for-sale, Amount	426,000			$ 426,000		214,000
Unpaid principal balance	836,213,000		784,126,000	836,213,000	784,126,000	811,493,000
Reserve for unfunded lending commitments	149,000		$ 207,000	149,000	$ 207,000
Modified value of TDR	120,000			9,575,000
Recorded Investment	120,000			9,547,000
Impaired Financing Receivable, Interest Income, Accrual Method	2,000			2,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 120,000			$ 9,575,000
Real Estate | Unfunded Loan Commitment
Reserve for unfunded lending commitments						$ 140,000