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, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment [Line Items]
Subtotal	$ 933,638,000		$ 910,004,000
Net Deferred Fees and Costs	961,000		1,074,000
Allowance for credit losses	(7,657,000)	$ (7,687,000)	(6,925,000)	$ (6,817,000)	$ (7,157,000)	$ (8,274,000)
Net loans	926,942,000		904,153,000
Real Estate
Financing Receivable, Recorded Investment [Line Items]
Subtotal	835,742,000		810,923,000
Allowance for credit losses	(7,163,000)	(7,206,000)	(6,539,000)	(6,473,000)	(6,754,000)	(7,483,000)
Agricultural
Financing Receivable, Recorded Investment [Line Items]
Subtotal	1,004,000		670,000
Allowance for credit losses	(2,000)	(2,000)	(1,000)	(1,000)	(1,000)	(6,000)
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Subtotal	66,397,000		66,483,000
Allowance for credit losses	(339,000)	(325,000)	(265,000)	(226,000)	(268,000)	(504,000)
Consumer
Financing Receivable, Recorded Investment [Line Items]
Subtotal	6,096,000		5,755,000
Allowance for credit losses	(94,000)	(91,000)	(78,000)	(73,000)	(89,000)	(84,000)
State and Political Subdivisions
Financing Receivable, Recorded Investment [Line Items]
Subtotal	24,399,000		26,173,000
Allowance for credit losses	$ (59,000)	$ (63,000)	$ (42,000)	$ (44,000)	$ (45,000)	$ (197,000)