LOANS AND ALLOWANCE FOR CREDIT LOSSES - Activity in allowance for credit losses (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance	$ 7,762,000	$ 7,687,000	$ 7,672,000	$ 6,925,000	$ 6,925,000
Charge-offs	(31,000)	(750,000)	(472,000)	(783,000)	(938,000)
Recoveries	14,000	2,000	31,000	23,000	45,000
(Release of) Provision for Credit Losses	255,000	718,000	769,000	1,492,000	1,640,000
Allowance, Ending Balance	8,000,000	7,657,000	8,000,000	7,657,000	7,672,000
Total	957,012,000	934,599,000	957,012,000	934,599,000	946,826,000
Reserve For Unfunded Lending Commitments	90,000	173,000	90,000	173,000
Loans Individually Evaluated For Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	4,474,000	3,868,000	4,474,000	3,868,000	4,523,000
Loans Collectively Evaluated For Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance			7,672,000
Allowance, Ending Balance	8,000,000	7,657,000	8,000,000	7,657,000	7,672,000
Total	952,538,000	930,731,000	952,538,000	930,731,000	942,303,000
Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance	7,293,000	7,206,000	7,215,000	6,539,000	6,539,000
Charge-offs		(237,000)	(17,000)	(237,000)	(345,000)
Recoveries	1,000		1,000	19,000	21,000
(Release of) Provision for Credit Losses	229,000	194,000	324,000	842,000	1,000,000
Allowance, Ending Balance	7,523,000	7,163,000	7,523,000	7,163,000	7,215,000
Total	866,145,000	836,213,000	866,145,000	836,213,000	850,656,000
Reserve For Unfunded Lending Commitments	63,000	149,000	63,000	149,000
Real Estate | Loans Individually Evaluated For Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	4,165,000	3,452,000	4,165,000	3,452,000	4,214,000
Real Estate | Loans Collectively Evaluated For Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance			7,215,000
Allowance, Ending Balance	7,523,000	7,163,000	7,523,000	7,163,000	7,215,000
Total	861,980,000	832,761,000	861,980,000	832,761,000	846,442,000
Agricultural
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance	3,000	2,000	2,000	1,000	1,000
(Release of) Provision for Credit Losses	(1,000)			1,000	1,000
Allowance, Ending Balance	2,000	2,000	2,000	2,000	2,000
Total	1,071,000	1,008,000	1,071,000	1,008,000	936,000
Agricultural | Loans Individually Evaluated For Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	309,000	309,000	309,000	309,000	309,000
Agricultural | Loans Collectively Evaluated For Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance			2,000
Allowance, Ending Balance	2,000	2,000	2,000	2,000	2,000
Total	762,000	699,000	762,000	699,000	627,000
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance	329,000	325,000	313,000	265,000	265,000
Charge-offs	(20,000)	(504,000)	(426,000)	(504,000)	(524,000)
Recoveries	12,000		28,000	1,000	19,000
(Release of) Provision for Credit Losses	24,000	518,000	430,000	577,000	553,000
Allowance, Ending Balance	345,000	339,000	345,000	339,000	313,000
Total	63,988,000	66,804,000	63,988,000	66,804,000	66,706,000
Reserve For Unfunded Lending Commitments	27,000	23,000	27,000	23,000
Commercial and Industrial | Loans Individually Evaluated For Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Total		107,000		107,000
Commercial and Industrial | Loans Collectively Evaluated For Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance			313,000
Allowance, Ending Balance	345,000	339,000	345,000	339,000	313,000
Total	63,988,000	66,697,000	63,988,000	66,697,000	66,706,000
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance	84,000	91,000	98,000	78,000	78,000
Charge-offs	(11,000)	(9,000)	(29,000)	(42,000)	(69,000)
Recoveries	1,000	2,000	2,000	3,000	5,000
(Release of) Provision for Credit Losses	8,000	10,000	11,000	55,000	84,000
Allowance, Ending Balance	82,000	94,000	82,000	94,000	98,000
Total	5,446,000	6,166,000	5,446,000	6,166,000	6,390,000
Consumer | Loans Collectively Evaluated For Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance			98,000
Allowance, Ending Balance	82,000	94,000	82,000	94,000	98,000
Total	5,446,000	6,166,000	5,446,000	6,166,000	6,390,000
State and Political Subdivisions
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance	53,000	63,000	44,000	42,000	42,000
(Release of) Provision for Credit Losses	(5,000)	(4,000)	4,000	17,000	2,000
Allowance, Ending Balance	48,000	59,000	48,000	59,000	44,000
Total	20,362,000	24,408,000	20,362,000	24,408,000	22,138,000
Reserve For Unfunded Lending Commitments		1,000		1,000
State and Political Subdivisions | Loans Collectively Evaluated For Impairment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance, Beginning balance			44,000
Allowance, Ending Balance	48,000	59,000	48,000	59,000	44,000
Total	$ 20,362,000	$ 24,408,000	$ 20,362,000	$ 24,408,000	$ 22,138,000