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Loans and Related Allowance for Credit Losses (Troubled Debt Restructurings on Financing Receivables) (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
contract
Sep. 30, 2017
USD ($)
contract
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
contract
Dec. 31, 2017
USD ($)
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts | contract 9     9  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 547       $ 413
Financing Receivable, Modifications, Post-Modification Recorded Investment 575       442
Financing Receivable, Modifications, Recorded Investment $ 457   $ 339 $ 339 339
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member] | Non-Accruing Troubled Debt Restructurings [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts     1 1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment         19
Financing Receivable, Modifications, Post-Modification Recorded Investment         20
Financing Receivable, Modifications, Recorded Investment     $ 4 $ 4 4
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Accruing Troubled Debt Restructurings [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts | contract 8     7  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 522       369
Financing Receivable, Modifications, Post-Modification Recorded Investment 550       397
Financing Receivable, Modifications, Recorded Investment $ 439   315 $ 315 315
Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Non-Accruing Troubled Debt Restructurings [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts | contract 1     1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 25       25
Financing Receivable, Modifications, Post-Modification Recorded Investment 25       25
Financing Receivable, Modifications, Recorded Investment $ 18   $ 20 $ 20 $ 20
Restructured Loan [Member] | Accruing Troubled Debt Restructurings [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts | contract 1 1      
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 153 $ 19      
Financing Receivable, Modifications, Post-Modification Recorded Investment 153 20      
Financing Receivable, Modifications, Recorded Investment $ 153 $ 7      
Restructured Loan [Member] | Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member] | Accruing Troubled Debt Restructurings [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts | contract   1      
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 19      
Financing Receivable, Modifications, Post-Modification Recorded Investment   20      
Financing Receivable, Modifications, Recorded Investment   $ 7      
Restructured Loan [Member] | Mortgage Loan [Member] | Real Estate Portfolio Segment [Member] | Accruing Troubled Debt Restructurings [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts | contract 1        
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 153        
Financing Receivable, Modifications, Post-Modification Recorded Investment 153        
Financing Receivable, Modifications, Recorded Investment $ 153