LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	$ 525,394	$ 514,132	$ 505,184	$ 488,497	$ 484,512
Total Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	625				625
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	531				307
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	90				141
Greater than 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	4				177
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross					484,512
Commercial, Financial and Agricultural | Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	65,821				61,458
Commercial, Financial and Agricultural | Commercial Portfolio Segment | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	73				99
Commercial, Financial and Agricultural | Commercial Portfolio Segment | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	73				75
Commercial, Financial and Agricultural | Commercial Portfolio Segment | Greater than 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross					24
Commercial Loan | Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	223,077				199,206
Commercial Loan | Commercial Portfolio Segment | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	117				111
Commercial Loan | Commercial Portfolio Segment | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	117
Commercial Loan | Commercial Portfolio Segment | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross					104
Commercial Loan | Commercial Portfolio Segment | Greater than 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross					7
Construction Loan | Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross					50,748
Mortgage Loan | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	162,385				150,290
Mortgage Loan | Consumer Portfolio Segment | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	426				383
Mortgage Loan | Consumer Portfolio Segment | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	332				205
Mortgage Loan | Consumer Portfolio Segment | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	90				36
Mortgage Loan | Consumer Portfolio Segment | Greater than 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	4				142
Obligations of State and Political Subdivisions | Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	17,232				18,770
Personal Loan | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	4,290				4,040
Personal Loan | Consumer Portfolio Segment | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	9				32
Personal Loan | Consumer Portfolio Segment | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross	$ 9				27
Personal Loan | Consumer Portfolio Segment | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross					1
Personal Loan | Consumer Portfolio Segment | Greater than 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivables, gross					$ 4