FAIR VALUE MEASUREMENT (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($)	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Financial assets:
Interest bearing deposits with banks	$ 11,741,000	$ 390,000	$ 190,000	$ 222,000	$ 143,000
Debt securities available for sale	67,564,000	66,527,000	69,098,000	72,485,000	73,536,000
Debt securities held to maturity	198,147,000	189,221,000	202,266,000	209,376,000	209,887,000
Restricted investment in bank stock	1,707,000	2,476,000	2,483,000	3,318,000	3,666,000
Financial liabilities:
Time deposits	552,018,000	556,823,000	544,677,000	524,214,000	512,381,000
Short-term borrowings	52,810,000	39,638,000	41,827,000	42,822,000	55,710,000
Long-term debt	20,000,000	20,000,000	20,000,000	20,000,000	20,000,000
Other interest bearing liabilities	951,000	$ 941,000	$ 1,006,000	$ 986,000	1,011,000
Carrying Value
Financial assets:
Cash and due from banks	17,189,000				10,856,000
Interest bearing deposits with banks	11,741,000				143,000
Debt securities available for sale	67,564,000				73,536,000
Debt securities held to maturity	200,644,000				209,565,000
Restricted investment in bank stock	1,707,000				3,666,000
Loans, net of allowance for credit losses	519,717,000				480,485,000
Interest rate swaps, assets					268,000
Accrued interest receivable	2,438,000				2,124,000
Financial liabilities:
Time deposits	197,387,000				142,271,000
Securities sold under agreements to repurchase	12,810,000				7,585,000
Short-term borrowings	40,000,000				48,125,000
Long-term debt	20,000,000				20,000,000
Other interest bearing liabilities	951,000				1,011,000
Accrued interest payable	1,397,000				333,000
Off-balance sheet financial instruments:
Commitments to extend credit	0				0
Letters of credit	0				0
Fair Value
Financial assets:
Cash and due from banks	17,189,000				10,856,000
Interest bearing deposits with banks	11,741,000				143,000
Debt securities available for sale	67,564,000				73,536,000
Debt securities held to maturity	198,147,000				209,887,000
Loans, net of allowance for credit losses	500,439,000				467,667,000
Interest rate swaps, assets					268,000
Accrued interest receivable	2,438,000				2,124,000
Financial liabilities:
Time deposits	194,219,000				134,417,000
Short-term borrowings	39,868,000				48,122,000
Long-term debt	19,638,000				19,156,000
Other interest bearing liabilities	947,000				1,009,000
Accrued interest payable	1,397,000				333,000
Off-balance sheet financial instruments:
Commitments to extend credit	0				0
Letters of credit	$ 0				$ 0