LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details)	3 Months Ended							12 Months Ended
	Mar. 31, 2026 USD ($) loan	Mar. 31, 2026 USD ($) loan	Mar. 31, 2026 USD ($) loan category	Mar. 31, 2026 USD ($) loan	Mar. 31, 2026 USD ($) contract loan	Mar. 31, 2026 USD ($) loan	Mar. 31, 2025 USD ($) loan contract	Dec. 31, 2025 USD ($) loan
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Number of loan portfolio segments | category			2
Loans held for sale	$ 452,000	$ 452,000	$ 452,000	$ 452,000	$ 452,000	$ 452,000		$ 1,140,000
Unpaid principal balance	$ 931,620,000	931,620,000	931,620,000	931,620,000	931,620,000	931,620,000	$ 964,181,000	946,661,000
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	$ 144,000	144,000	144,000	144,000	144,000	144,000	$ 89,000
Accrued interest exclude from the amortized cost basis of loans	2,614,000	2,614,000	2,614,000	2,614,000	$ 2,614,000	$ 2,614,000		2,736,000
Number of contracts					2	2	0
Financing Receivable, Modifications, Recorded Investment	$ 640,000	640,000	$ 640,000	$ 640,000	$ 640,000	$ 640,000		12,661,000
Modified value of TDR		640,000
Recorded Investment		640,000						12,661,000
Financing receivable modifications unfunded commitments		$ 0						$ 0
Number of TDRs not in compliance with restructure | loan	0	0	0	0	0	0		2
Number of loans modified as troubled debt restructuring within previous 12 months, with subsequent payment default | loan						3	2
Foreclosed Assets Held For Resale	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0		$ 0
Consumer mortgage loans	0	0	0	0	0	0		0
GGLs
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Unpaid principal balance	3,766,000	3,766,000	3,766,000	3,766,000	3,766,000	3,766,000		3,902,000
Unfunded Loan Commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Reserve for unfunded lending commitments	$ 144,000	144,000	144,000	144,000	$ 144,000	$ 144,000		90,000
Loan one
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Modified value of TDR		311,000					$ 425,000
Loan carrying a post modification recorded investment, paid current							$ 120,000
Number of loans modified as troubled debt restructuring within previous 12 months, with subsequent payment default | loan						1	1
Loan two
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Modified value of TDR		9,571,000
Number of loans modified as troubled debt restructuring within previous 12 months, with subsequent payment default | loan						1
Loan three
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Number of financing receivable contracts modified | loan						1
Payment Modification
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Number of contracts | loan						1
Interest-only payments
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Number of contracts | contract					1
Period of interest only payments	6 months
Extended maturity and interest only payments
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Number of contracts | contract					1
Period of interest only payments	4 months
Loan modification extension term	4 months
Commercial and Industrial
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Unpaid principal balance	$ 66,187,000	66,187,000	66,187,000	66,187,000	$ 66,187,000	$ 66,187,000	$ 68,223,000	66,924,000
Reserve for unfunded lending commitments	23,000	23,000	23,000	23,000	23,000	23,000	16,000
Financing Receivable, Modifications, Recorded Investment								7,000
Commercial and Industrial | GGLs
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Government guaranteed loans	3,766,000	3,766,000	3,766,000	3,766,000	3,766,000	3,766,000		3,902,000
Commercial and Industrial | Unfunded Loan Commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Reserve for unfunded lending commitments								24,000
State and Political Subdivisions
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Unpaid principal balance	20,083,000	20,083,000	20,083,000	20,083,000	20,083,000	20,083,000	24,633,000	20,132,000
Reserve for unfunded lending commitments	13,000	13,000	13,000	13,000	13,000	13,000
Tax free loans	$ 20,083,000	$ 20,083,000	$ 20,083,000	$ 20,083,000	$ 20,083,000	$ 20,083,000		20,083,000
State and Political Subdivisions | Unfunded Loan Commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Reserve for unfunded lending commitments								12,000
Commercial Real Estate | Maximum
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Term of loan offering	20 years
Maximum loan to value ratio				80.00%
Residential Real Estate | Residential Mortgage
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Maximum loan to value ratio				80.00%
Loans held for sale term	30 years	30 years	30 years	30 years	30 years	30 years
Maximum loan to value ratio with PMI	95.00%	95.00%	95.00%	95.00%	95.00%	95.00%
Residential Real Estate | Residential Mortgage | Maximum
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Term of loan offering	20 years
Loans held for sale term	30 years	30 years	30 years	30 years	30 years	30 years
Residential Real Estate | Home Equity Loan
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Maximum loan to value ratio				80.00%
Residential Real Estate | Home Equity Loan | Maximum
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Term of loan offering	15 years
Residential Real Estate | Home Equity Line of Credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Maximum loan to value ratio				80.00%
Residential Real Estate | Home Equity Line of Credit | Maximum
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Term of loan offering	20 years
Consumer
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Unpaid principal balance	$ 4,881,000	$ 4,881,000	$ 4,881,000	$ 4,881,000	$ 4,881,000	$ 4,881,000	6,544,000	4,953,000
Agricultural
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Unpaid principal balance	$ 1,230,000	1,230,000	1,230,000	$ 1,230,000	1,230,000	1,230,000	1,117,000	984,000
Agricultural | Maximum
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Term of loan offering	10 years
Maximum loan to value ratio				70.00%
Real Estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans held for sale	$ 452,000	452,000	452,000	$ 452,000	452,000	452,000		1,140,000
Unpaid principal balance	839,239,000	839,239,000	839,239,000	839,239,000	839,239,000	839,239,000	863,664,000	853,668,000
Reserve for unfunded lending commitments	108,000	108,000	108,000	108,000	$ 108,000	$ 108,000	$ 73,000
Number of contracts					2	2
Financing Receivable, Modifications, Recorded Investment	$ 640,000	640,000	$ 640,000	$ 640,000	$ 640,000	$ 640,000		12,654,000
Modified value of TDR		640,000
Recorded Investment		$ 640,000
Number of loans modified as troubled debt restructuring within previous 12 months, with subsequent payment default | loan							0
Real Estate | Unfunded Loan Commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Reserve for unfunded lending commitments								$ 54,000
Real Estate | Payment Modification
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Number of contracts | loan						1