LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments	$ 25,899,000	$ 22,966,000	$ 22,401,000	$ 21,347,000	$ 20,205,000	$ 20,549,000
Outstanding commitment amount to borrowers	$ 0
Commercial Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income discontinued over delinquent days	90 days
Closed Ended Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income discontinued over delinquent days	120 days
Real Estate and Open Ended Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income discontinued over delinquent days	180 days
Unfunded Commitments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments	$ 457,000	482,000	490,000	627,000	435,000	334,000
Commercial/Agricultural Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments	$ 21,421,000	$ 18,251,000	$ 17,654,000	$ 17,164,000	$ 16,244,000	$ 16,516,000
Commercial/Agricultural Real Estate \| Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan-to-value ratio (as a percent)	75.00%