Loans and Related Allowance for Credit Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 2,551	$ 3,303
Current	412,428	414,328
Total loans	414,979	417,631	$ 389,180
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	6	336
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	862	1,285
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	283	576
Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,406	1,442
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11	6
Current	49,362	46,557
Total loans	49,373	46,563	51,262
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11	6
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	139,796	141,295	138,470
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | Excluding Loans Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,093	1,214
Current	138,172	139,890
Total loans	139,265	141,104
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		306
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	137	140
Current	394	51
Total loans	531	191
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | 30-59 Days Past Due [Member] | Excluding Loans Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	80
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | 30-59 Days Past Due [Member] | Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		140
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | 60-89 Days Past Due [Member] | Excluding Loans Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	121
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | 60-89 Days Past Due [Member] | Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	137
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | Greater than 90 Days Past Due [Member] | Excluding Loans Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	892	1,214
Construction Loan [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	332	61
Current	36,815	36,627
Total loans	37,147	36,688	33,329
Construction Loan [Member] | Real Estate Portfolio Segment [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	332	32
Construction Loan [Member] | Real Estate Portfolio Segment [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		29
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	158,636	163,548	143,580
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Excluding Loans Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	722	1,560
Current	156,970	161,651
Total loans	157,692	163,211
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		23
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	145	266
Current	799	71
Total loans	944	337
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	6	7
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | 30-59 Days Past Due [Member] | Excluding Loans Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	228	824
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | 30-59 Days Past Due [Member] | Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	139	259
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | 60-89 Days Past Due [Member] | Excluding Loans Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		561
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Greater than 90 Days Past Due [Member] | Excluding Loans Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	494	175
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Greater than 90 Days Past Due [Member] | Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6	7
Obligations of State and Political Subdivisions [Member] | Unallocated Financing Receivables [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	19,870	19,129
Total loans	19,870	19,129	13,428
Personal Loan [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	111	56
Current	10,046	10,352
Total loans	10,157	10,408	$ 9,111
Personal Loan [Member] | Consumer Portfolio Segment [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	72	24
Personal Loan [Member] | Consumer Portfolio Segment [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	25	15
Personal Loan [Member] | Consumer Portfolio Segment [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 14	$ 17