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, 2023	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Allowance, Beginning balance	$ 7,157,000	$ 9,160,000	$ 8,274,000	$ 8,680,000	$ 8,680,000
Charge-offs	(5,000)	(171,000)	(43,000)	(186,000)	(206,000)
Recoveries	35,000	3,000	41,000	61,000	64,000
(Credit) Provision	(370,000)	219,000	(336,000)	656,000	(264,000)
Allowance, Ending Balance	6,817,000	9,211,000	6,817,000	9,211,000	8,274,000
Total	881,038,000		881,038,000	845,675,000	858,469,000
Reserve For Unfunded Lending Commitments	233,000		233,000
Ending Balance	881,038,000		881,038,000	845,675,000	858,469,000
Unfunded Loan Commitment
Reserve For Unfunded Lending Commitments	233,000		233,000		68,000
Reserve For Unfunded Lending Commitments	233,000		233,000		68,000
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance			7,155,000
Allowance, Ending Balance					7,155,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance			(1,119,000)
Allowance, Ending Balance					(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]
Allowance, Beginning balance			0
Allowance, Ending Balance					0
Total	5,318,000		5,318,000	12,177,000	11,207,000
Ending Balance	5,318,000		5,318,000	12,177,000	11,207,000
Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			8,274,000
Allowance, Ending Balance	6,817,000		6,817,000	9,211,000	8,274,000
Total	875,720,000		875,720,000	833,498,000	847,262,000
Ending Balance	875,720,000		875,720,000	833,498,000	847,262,000
Real Estate
Allowance, Beginning balance	6,754,000		7,483,000
Recoveries	34,000		36,000
(Credit) Provision	(315,000)		(329,000)
Allowance, Ending Balance	6,473,000		6,473,000		7,483,000
Total	784,126,000		784,126,000		764,880,000
Reserve For Unfunded Lending Commitments	207,000		207,000
Ending Balance	784,126,000		784,126,000		764,880,000
Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance			6,766,000
Allowance, Ending Balance					6,766,000
Real Estate | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance			(717,000)
Allowance, Ending Balance					(717,000)
Real Estate | Loans Individually Evaluated For Impairment [Member]
Total	4,385,000		4,385,000
Ending Balance	4,385,000		4,385,000
Real Estate | Loans Collectively Evaluated For Impairment [Member]
Allowance, Ending Balance	6,473,000		6,473,000
Total	779,741,000		779,741,000
Ending Balance	779,741,000		779,741,000
Agricultural
Allowance, Beginning balance	1,000		6,000
(Credit) Provision			(1,000)
Allowance, Ending Balance	1,000		1,000		6,000
Total	708,000		708,000		860,000
Ending Balance	708,000		708,000		860,000
Agricultural | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance			2,000
Allowance, Ending Balance					2,000
Agricultural | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance			(4,000)
Allowance, Ending Balance					(4,000)
Agricultural | Loans Individually Evaluated For Impairment [Member]
Total	309,000		309,000
Ending Balance	309,000		309,000
Agricultural | Loans Collectively Evaluated For Impairment [Member]
Allowance, Ending Balance	1,000		1,000
Total	399,000		399,000
Ending Balance	399,000		399,000
Commercial and industrial
Allowance, Beginning balance		675,000	704,000	681,000	681,000
Charge-offs		(149,000)		(158,000)	(158,000)
Recoveries				2,000	3,000
(Credit) Provision		192,000		193,000	178,000
Allowance, Ending Balance		718,000		718,000	704,000
Total				85,855,000	86,999,000
Ending Balance				85,855,000	86,999,000
Commercial and industrial | Loans Individually Evaluated For Impairment [Member]
Allowance, Beginning balance			0
Allowance, Ending Balance					0
Total				979,000	973,000
Ending Balance				979,000	973,000
Commercial and industrial | Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			704,000
Allowance, Ending Balance				718,000	704,000
Total				84,876,000	86,026,000
Ending Balance				84,876,000	86,026,000
Commercial and Industrial
Allowance, Beginning balance	268,000		504,000
Recoveries			2,000
(Credit) Provision	(42,000)		(19,000)
Allowance, Ending Balance	226,000		226,000		504,000
Total	62,866,000		62,866,000		56,077,000
Reserve For Unfunded Lending Commitments	25,000		25,000
Ending Balance	62,866,000		62,866,000		56,077,000
Commercial and Industrial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance			243,000
Allowance, Ending Balance					243,000
Commercial and Industrial | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance			(261,000)
Allowance, Ending Balance					(261,000)
Commercial and Industrial | Loans Individually Evaluated For Impairment [Member]
Total	624,000		624,000
Ending Balance	624,000		624,000
Commercial and Industrial | Loans Collectively Evaluated For Impairment [Member]
Allowance, Ending Balance	226,000		226,000
Total	62,242,000		62,242,000
Ending Balance	62,242,000		62,242,000
commercial real estate
Allowance, Beginning balance		5,954,000	5,932,000	5,408,000	5,408,000
Charge-offs					(3,000)
Recoveries				38,000	40,000
(Credit) Provision		93,000		601,000	487,000
Allowance, Ending Balance		6,047,000		6,047,000	5,932,000
Total				600,068,000	611,549,000
Ending Balance				600,068,000	611,549,000
commercial real estate | Loans Individually Evaluated For Impairment [Member]
Allowance, Beginning balance			0
Allowance, Ending Balance					0
Total				10,357,000	9,495,000
Ending Balance				10,357,000	9,495,000
commercial real estate | Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			5,932,000
Allowance, Ending Balance				6,047,000	5,932,000
Total				589,711,000	602,054,000
Ending Balance				589,711,000	602,054,000
residential real estate
Allowance, Beginning balance		1,609,000	1,557,000	1,539,000	1,539,000
Charge-offs		(12,000)		(12,000)	(12,000)
Recoveries		2,000		16,000	16,000
(Credit) Provision		11,000		67,000	14,000
Allowance, Ending Balance		1,610,000		1,610,000	1,557,000
Total				154,324,000	154,506,000
Ending Balance				154,324,000	154,506,000
residential real estate | Loans Individually Evaluated For Impairment [Member]
Allowance, Beginning balance			0
Allowance, Ending Balance					0
Total				841,000	739,000
Ending Balance				841,000	739,000
residential real estate | Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			1,557,000
Allowance, Ending Balance				1,610,000	1,557,000
Total				153,483,000	153,767,000
Ending Balance				153,483,000	153,767,000
Consumer
Allowance, Beginning balance	89,000		84,000
Charge-offs	(5,000)		(43,000)
Recoveries	1,000		3,000
(Credit) Provision	(12,000)		18,000
Allowance, Ending Balance	73,000		73,000		84,000
Total	6,218,000		6,218,000		5,707,000
Ending Balance	6,218,000		6,218,000		5,707,000
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance			95,000
Allowance, Ending Balance					95,000
Consumer | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance			11,000
Allowance, Ending Balance					11,000
Consumer | Loans Collectively Evaluated For Impairment [Member]
Allowance, Ending Balance	73,000		73,000
Total	6,218,000		6,218,000
Ending Balance	6,218,000		6,218,000
Consumer
Allowance, Beginning balance		79,000	81,000	84,000	84,000
Charge-offs		(10,000)		(16,000)	(33,000)
Recoveries		1,000		5,000	5,000
(Credit) Provision		5,000		2,000	25,000
Allowance, Ending Balance		75,000		75,000	81,000
Total				5,428,000	5,415,000
Ending Balance				5,428,000	5,415,000
Consumer | Loans Individually Evaluated For Impairment [Member]
Allowance, Beginning balance			0
Allowance, Ending Balance					0
Total					0
Ending Balance					0
Consumer | Loans Collectively Evaluated For Impairment [Member]
Allowance, Beginning balance			81,000
Allowance, Ending Balance				75,000	81,000
Total				5,428,000	5,415,000
Ending Balance				5,428,000	5,415,000
State and Political Subdivisions
Allowance, Beginning balance	45,000		197,000
(Credit) Provision	(1,000)		(5,000)
Allowance, Ending Balance	44,000		44,000		197,000
Total	27,120,000		27,120,000		30,945,000
Reserve For Unfunded Lending Commitments	1,000		1,000
Ending Balance	27,120,000		27,120,000		30,945,000
State and Political Subdivisions | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance, Beginning balance			49,000
Allowance, Ending Balance					49,000
State and Political Subdivisions | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance, Beginning balance			(148,000)
Allowance, Ending Balance					(148,000)
State and Political Subdivisions | Loans Collectively Evaluated For Impairment [Member]
Allowance, Ending Balance	44,000		44,000
Total	27,120,000		27,120,000
Ending Balance	$ 27,120,000		27,120,000
Unallocated Financing Receivables
Allowance, Beginning balance		843,000		968,000	968,000
Charge-offs					0
Recoveries					0
(Credit) Provision		(82,000)		(207,000)	(968,000)
Allowance, Ending Balance		$ 761,000		761,000
Total					0
Ending Balance					0
Unallocated Financing Receivables | Loans Individually Evaluated For Impairment [Member]
Allowance, Beginning balance			$ 0
Allowance, Ending Balance					0
Total					0
Ending Balance					0
Unallocated Financing Receivables | Loans Collectively Evaluated For Impairment [Member]
Allowance, Ending Balance				$ 761,000
Total					0
Ending Balance					$ 0