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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
Mar. 31, 2016
Mar. 31, 2015
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Total $ 6,120 $ 6,377
Interest Income Recognized, Total 13 21
Cash Basis Interest Income, Total 6 13
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 247 1
Average Recorded Investment, Total 247 1
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 1,834 2,242
Impaired Loans with No Allowance: Interest Income Recognized 9 11
Impaired Loans with No Allowance: Cash Basis Interest Income   6
Impaired Loans with Allowance: Average Recorded Investment   101
Average Recorded Investment, Total 1,834 2,343
Interest Income Recognized, Total 9 11
Cash Basis Interest Income, Total   6
Construction Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment   169
Impaired Loans with Allowance: Average Recorded Investment   168
Average Recorded Investment, Total   337
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 2,420 2,919
Impaired Loans with No Allowance: Interest Income Recognized 4 10
Impaired Loans with No Allowance: Cash Basis Interest Income 6 7
Impaired Loans with Allowance: Average Recorded Investment 165 777
Average Recorded Investment, Total 2,585 3,696
Interest Income Recognized, Total 4 10
Cash Basis Interest Income, Total 6 $ 7
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 827  
Average Recorded Investment, Total 827  
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 627  
Average Recorded Investment, Total $ 627