Loans and Related Allowance for Credit Losses (Classes of the Loan Portfolio Summarized by the Aggregate Risk Rating) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 418,075	$ 383,904	$ 382,616
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	396,755	332,904
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,777	34,456
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,324	14,970
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,219	1,574
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	49,722	45,802	48,551
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	46,092	34,826
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,023	8,692
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	607	2,280
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		4
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	135,647	140,369	134,340
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	124,341	114,299
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,754	17,928
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,657	7,189
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	895	953
Construction Loan [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	36,950	28,403	28,145
Construction Loan [Member] | Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	34,279	22,470
Construction Loan [Member] | Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		3,297
Construction Loan [Member] | Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,671	2,636
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	167,198	146,888	147,783
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	163,505	139,861
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		3,551
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,369	2,859
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	324	617
Obligations of State and Political Subdivisions [Member] | Unallocated Financing Receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,755	13,044	13,862
Obligations of State and Political Subdivisions [Member] | Unallocated Financing Receivables [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,755	12,088
Obligations of State and Political Subdivisions [Member] | Unallocated Financing Receivables [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		956
Personal Loan [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,803	9,398	$ 9,935
Personal Loan [Member] | Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,783	9,360
Personal Loan [Member] | Consumer Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		32
Personal Loan [Member] | Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 20	$ 6