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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Total $ 4,535 $ 9,501 $ 6,384 $ 11,383
Interest Income Recognized, Total 4 91 14 306
Cash Basis Interest Income, Total 14 6 16 19
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment   351 234 396
Impaired Loans with No Allowance: Interest Income Recognized   5   18
Impaired Loans with Allowance: Average Recorded Investment   8    
Average Recorded Investment, Total   359 234 396
Interest Income Recognized, Total   5   18
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 912 5,336 2,971 5,671
Impaired Loans with No Allowance: Interest Income Recognized   81   238
Impaired Loans with Allowance: Average Recorded Investment   460    
Average Recorded Investment, Total 912 5,796 2,971 5,671
Interest Income Recognized, Total   81   238
Construction Loan [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment       1,228
Impaired Loans with No Allowance: Interest Income Recognized       34
Average Recorded Investment, Total       1,228
Interest Income Recognized, Total       34
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 1,990 2,795 2,122 2,933
Impaired Loans with No Allowance: Interest Income Recognized 4 5 14 16
Impaired Loans with No Allowance: Cash Basis Interest Income 14 6 16 19
Impaired Loans with Allowance: Average Recorded Investment       356
Average Recorded Investment, Total 1,990 2,795 2,122 3,289
Interest Income Recognized, Total 4 5 14 16
Cash Basis Interest Income, Total 14 6 16 19
Personal Loan [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 17   9  
Average Recorded Investment, Total 17   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 521 204 350 420
Average Recorded Investment, Total 521 204 350 420
Acquired with Credit Deterioration [Member] | Mortgage Loan [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 1,095 347 698 379
Average Recorded Investment, Total $ 1,095 $ 347 $ 698 $ 379