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Loans and Related Allowance for Credit Losses (Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Total $ 4,233 $ 4,031 $ 4,053 $ 6,412
Interest Income Recognized, Total 58 5 66 10
Cash Basis Interest Income, Total 11 1 23 2
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 382 1 382 234
Impaired Loans with No Allowance: Interest Income Recognized 22   22  
Average Recorded Investment, Total 382 1 382 234
Interest Income Recognized, Total 22   22  
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 1,228 906 1,076 2,972
Impaired Loans with No Allowance: Interest Income Recognized 32   35  
Average Recorded Investment, Total 1,228 906 1,076 2,972
Interest Income Recognized, Total 32   35  
Construction Loan [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment     14  
Average Recorded Investment, Total     14  
Mortgage Loan [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 1,291 2,034 1,226 2,101
Impaired Loans with No Allowance: Interest Income Recognized 4 5 9 10
Impaired Loans with No Allowance: Cash Basis Interest Income 11 1 23 2
Average Recorded Investment, Total 1,291 2,034 1,226 2,101
Interest Income Recognized, Total 4 5 9 10
Cash Basis Interest Income, Total 11 1 23 2
Personal Loan [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 14 9 16 9
Average Recorded Investment, Total 14 9 16 9
Acquired with Credit Deterioration [Member] | Commercial Loan [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 458 351 465 362
Average Recorded Investment, Total 458 351 465 362
Acquired with Credit Deterioration [Member] | Mortgage Loan [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 860 730 874 734
Average Recorded Investment, Total $ 860 $ 730 $ 874 $ 734