LOANS AND ALLOWANCE FOR CREDIT LOSSES - Activity in allowance for credit losses (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	$ 9,412,000	$ 7,672,000	$ 7,672,000
Charge-offs	(34,000)	(371,000)	(2,994,000)
Recoveries	50,000	16,000	33,000
(Recovery of) Provision for Credit Losses	(390,000)	751,000	4,701,000
Allowance, Ending Balance	9,038,000	8,068,000	9,412,000
Reserve for Unfunded Lending Commitments	144,000	89,000
Total	931,620,000	964,181,000	946,661,000
Loans Individually Evaluated For Impairment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	973,000
Allowance, Ending Balance	841,000		973,000
Total	17,165,000	5,027,000	17,052,000
Loans Collectively Evaluated For Impairment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	8,439,000
Allowance, Ending Balance	8,197,000	8,068,000	8,439,000
Total	914,455,000	959,154,000	929,609,000
Real Estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	8,836,000	7,215,000	7,215,000
Charge-offs			(2,017,000)
Recoveries	42,000		1,000
(Recovery of) Provision for Credit Losses	(416,000)	357,000	3,637,000
Allowance, Ending Balance	8,462,000	7,572,000	8,836,000
Reserve for Unfunded Lending Commitments	108,000	73,000
Total	839,239,000	863,664,000	853,668,000
Real Estate | Loans Individually Evaluated For Impairment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	973,000
Allowance, Ending Balance	841,000		973,000
Total	16,886,000	4,718,000	16,763,000
Real Estate | Loans Collectively Evaluated For Impairment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	7,863,000
Allowance, Ending Balance	7,621,000	7,572,000	7,863,000
Total	822,353,000	858,946,000	836,905,000
Agricultural
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	2,000	2,000	2,000
(Recovery of) Provision for Credit Losses	3,000
Allowance, Ending Balance	5,000	2,000	2,000
Total	1,230,000	1,117,000	984,000
Agricultural | Loans Individually Evaluated For Impairment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Total	279,000	309,000	279,000
Agricultural | Loans Collectively Evaluated For Impairment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	2,000
Allowance, Ending Balance	5,000	2,000	2,000
Total	951,000	808,000	705,000
Commercial and Industrial
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	452,000	313,000	313,000
Charge-offs		(361,000)	(942,000)
Recoveries	8,000	15,000	29,000
(Recovery of) Provision for Credit Losses	(19,000)	374,000	1,052,000
Allowance, Ending Balance	441,000	341,000	452,000
Reserve for Unfunded Lending Commitments	23,000	16,000
Total	66,187,000	68,223,000	66,924,000
Commercial and Industrial | Loans Individually Evaluated For Impairment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Total			10,000
Commercial and Industrial | Loans Collectively Evaluated For Impairment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	452,000
Allowance, Ending Balance	441,000	341,000	452,000
Total	66,187,000	68,223,000	66,914,000
Consumer
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	74,000	98,000	98,000
Charge-offs	(34,000)	(10,000)	(35,000)
Recoveries		1,000	3,000
(Recovery of) Provision for Credit Losses	42,000	5,000	8,000
Allowance, Ending Balance	82,000	94,000	74,000
Total	4,881,000	6,544,000	4,953,000
Consumer | Loans Collectively Evaluated For Impairment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	74,000
Allowance, Ending Balance	82,000	94,000	74,000
Total	4,881,000	6,544,000	4,953,000
State and Political Subdivisions
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	48,000	44,000	44,000
(Recovery of) Provision for Credit Losses		15,000	4,000
Allowance, Ending Balance	48,000	59,000	48,000
Reserve for Unfunded Lending Commitments	13,000
Total	20,083,000	24,633,000	20,132,000
State and Political Subdivisions | Loans Collectively Evaluated For Impairment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Allowance, Beginning balance	48,000
Allowance, Ending Balance	48,000	59,000	48,000
Total	$ 20,083,000	$ 24,633,000	$ 20,132,000