LOANS AND ALLOWANCE FOR CREDIT LOSSES - Activity in allowance for credit losses (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Allowance, Beginning balance	$ 7,196,000	$ 7,142,000	$ 6,925,000	$ 8,274,000	$ 8,274,000
Charge-offs	(21,000)	(21,000)	(33,000)	(38,000)	(57,000)
Recoveries	2,000	2,000	21,000	6,000	44,000
(Credit) Provision	510,000	34,000	774,000	34,000	(217,000)
Allowance, Ending Balance	7,687,000	7,157,000	7,687,000	7,157,000	6,925,000
Total	922,494,000	871,239,000	922,494,000	871,239,000	911,078,000
Reserve For Unfunded Lending Commitments	196,000	260,000	196,000	260,000	166,000
Unfunded Loan Commitment
Reserve For Unfunded Lending Commitments	196,000		196,000		166,000
Reserve For Unfunded Lending Commitments	196,000	260,000	196,000	260,000	166,000	$ 68,000
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance				7,155,000	7,155,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance				(1,119,000)	(1,119,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unfunded Loan Commitment
Reserve For Unfunded Lending Commitments		147,000		147,000
Loans Individually Evaluated For Impairment [Member]
Total	4,849,000	5,398,000	4,849,000	5,398,000	4,925,000
Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			6,925,000
Allowance, Ending Balance	7,687,000	7,157,000	7,687,000	7,157,000	6,925,000
Total	917,645,000	865,841,000	917,645,000	865,841,000	906,153,000
Real Estate
Allowance, Beginning balance	6,725,000	6,735,000	6,539,000	7,483,000	7,483,000
Recoveries	1,000	1,000	19,000	2,000	37,000
(Credit) Provision	480,000	18,000	648,000	(14,000)	(264,000)
Allowance, Ending Balance	7,206,000	6,754,000	7,206,000	6,754,000	6,539,000
Total	824,217,000	774,688,000	824,217,000	774,688,000	811,493,000
Reserve For Unfunded Lending Commitments	159,000	225,000	159,000	225,000	140,000
Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance				6,766,000	6,766,000
Real Estate | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance				(717,000)	(717,000)
Real Estate | Loans Individually Evaluated For Impairment [Member]
Total	3,929,000	4,445,000	3,929,000	4,445,000	4,005,000
Real Estate | Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			6,539,000
Allowance, Ending Balance	7,206,000	6,754,000	7,206,000	6,754,000	6,539,000
Total	820,288,000	770,243,000	820,288,000	770,243,000	807,488,000
Agricultural
Allowance, Beginning balance	1,000	1,000	1,000	6,000	6,000
(Credit) Provision	1,000		1,000	(1,000)	(1,000)
Allowance, Ending Balance	2,000	1,000	2,000	1,000	1,000
Total	990,000	862,000	990,000	862,000	671,000
Agricultural | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance				2,000	2,000
Agricultural | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance				(4,000)	(4,000)
Agricultural | Loans Individually Evaluated For Impairment [Member]
Total	309,000	309,000	309,000	309,000	309,000
Agricultural | Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			1,000
Allowance, Ending Balance	2,000	1,000	2,000	1,000	1,000
Total	681,000	553,000	681,000	553,000	362,000
Commercial and Industrial
Allowance, Beginning balance	322,000	265,000	265,000	504,000	504,000
Recoveries	1,000	1,000	1,000	2,000	2,000
(Credit) Provision	2,000	2,000	59,000	23,000	20,000
Allowance, Ending Balance	325,000	268,000	325,000	268,000	265,000
Total	64,959,000	61,313,000	64,959,000	61,313,000	66,909,000
Reserve For Unfunded Lending Commitments	36,000	35,000	36,000	35,000	25,000
Commercial and Industrial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance				243,000	243,000
Commercial and Industrial | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance				(261,000)	(261,000)
Commercial and Industrial | Loans Individually Evaluated For Impairment [Member]
Total	611,000	644,000	611,000	644,000	611,000
Commercial and Industrial | Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			265,000
Allowance, Ending Balance	325,000	268,000	325,000	268,000	265,000
Total	64,348,000	60,669,000	64,348,000	60,669,000	66,298,000
Consumer
Allowance, Beginning balance	85,000	93,000	78,000	84,000	84,000
Charge-offs	(21,000)	(21,000)	(33,000)	(38,000)	(57,000)
Recoveries			1,000	2,000	5,000
(Credit) Provision	27,000	17,000	45,000	30,000	35,000
Allowance, Ending Balance	91,000	89,000	91,000	89,000	78,000
Total	6,250,000	6,129,000	6,250,000	6,129,000	5,824,000
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance				95,000	95,000
Consumer | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance				11,000	11,000
Consumer | Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			78,000
Allowance, Ending Balance	91,000	89,000	91,000	89,000	78,000
Total	6,250,000	6,129,000	6,250,000	6,129,000	5,824,000
State and Political Subdivisions
Allowance, Beginning balance	63,000	48,000	42,000	197,000	197,000
(Credit) Provision		(3,000)	21,000	(4,000)	(7,000)
Allowance, Ending Balance	63,000	45,000	63,000	45,000	42,000
Total	26,078,000	28,247,000	26,078,000	28,247,000	26,181,000
Reserve For Unfunded Lending Commitments	1,000		1,000		1,000
State and Political Subdivisions | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance				49,000	49,000
State and Political Subdivisions | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance				(148,000)	(148,000)
State and Political Subdivisions | Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			42,000
Allowance, Ending Balance	63,000	45,000	63,000	45,000	42,000
Total	$ 26,078,000	$ 28,247,000	$ 26,078,000	$ 28,247,000	$ 26,181,000