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Loans and Related Allowance for Credit Losses (Troubled Debt Restructurings on Financing Receivables) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
contract
Jun. 30, 2019
USD ($)
contract
Jun. 30, 2018
USD ($)
contract
Dec. 31, 2018
USD ($)
contract
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | contract   10   9
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 830,000   $ 547,000
Financing Receivable, Modifications, Post-Modification Recorded Investment   878,000   575,000
Financing Receivable, Modifications, Recorded Investment   756,000   $ 445,000
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member] | Non-Accruing Troubled Debt Restructurings [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Recorded Investment   $ 324,000    
Commercial 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   $ 306,000    
Financing Receivable, Modifications, Post-Modification Recorded Investment   326,000    
Financing Receivable, Modifications, Recorded Investment   $ 324,000    
Mortgage Loan [Member] | Consumer Portfolio Segment [Member] | Accruing Troubled Debt Restructurings [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | contract   8   8
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 499,000   $ 522,000
Financing Receivable, Modifications, Post-Modification Recorded Investment   527,000   550,000
Financing Receivable, Modifications, Recorded Investment   $ 416,000   $ 428,000
Mortgage Loan [Member] | Consumer 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   $ 25,000   $ 25,000
Financing Receivable, Modifications, Post-Modification Recorded Investment   25,000   25,000
Financing Receivable, Modifications, Recorded Investment   $ 16,000   $ 17,000
Restructured Loan [Member] | Accruing Troubled Debt Restructurings [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | contract 1 1 1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 153,000 $ 306,000 $ 153,000  
Financing Receivable, Modifications, Post-Modification Recorded Investment 153,000 326,000 153,000  
Financing Receivable, Modifications, Recorded Investment $ 153,000 $ 324,000 $ 153,000  
Restructured Loan [Member] | Commercial Loan [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   $ 306,000    
Financing Receivable, Modifications, Post-Modification Recorded Investment   326,000    
Financing Receivable, Modifications, Recorded Investment   $ 324,000    
Restructured Loan [Member] | Mortgage Loan [Member] | Consumer Portfolio Segment [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 $ 153,000   $ 153,000  
Financing Receivable, Modifications, Post-Modification Recorded Investment 153,000   153,000  
Financing Receivable, Modifications, Recorded Investment $ 153,000   $ 153,000