LOANS AND ALLOWANCE FOR CREDIT LOSSES - Outstanding loan balances by loan class prior to allocation of net deferred fees and costs (Details) - USD ($)	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment [Line Items]
Subtotal: Total Loans	$ 957,012,000		$ 946,826,000
Net Deferred Fees and Costs	618,000		888,000
Subtotal: Total Loans Held for Investment	957,630,000		947,714,000
Loans held for sale	103,000		737,000
Allowance for credit losses	(8,000,000)	$ (7,762,000)	(7,672,000)	$ (7,657,000)	$ (7,687,000)	$ (6,925,000)
Net loans	949,733,000		940,779,000
Real Estate
Financing Receivable, Recorded Investment [Line Items]
Subtotal: Total Loans	866,145,000		850,656,000
Loans held for sale	103,000		737,000
Allowance for credit losses	(7,523,000)	(7,293,000)	(7,215,000)	(7,163,000)	(7,206,000)	(6,539,000)
Agricultural
Financing Receivable, Recorded Investment [Line Items]
Subtotal: Total Loans	1,071,000		936,000
Allowance for credit losses	(2,000)	(3,000)	(2,000)	(2,000)	(2,000)	(1,000)
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Subtotal: Total Loans	63,988,000		66,706,000
Allowance for credit losses	(345,000)	(329,000)	(313,000)	(339,000)	(325,000)	(265,000)
Consumer
Financing Receivable, Recorded Investment [Line Items]
Subtotal: Total Loans	5,446,000		6,390,000
Allowance for credit losses	(82,000)	(84,000)	(98,000)	(94,000)	(91,000)	(78,000)
State and Political Subdivisions
Financing Receivable, Recorded Investment [Line Items]
Subtotal: Total Loans	20,362,000		22,138,000
Allowance for credit losses	$ (48,000)	$ (53,000)	$ (44,000)	$ (59,000)	$ (63,000)	$ (42,000)