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Loans and Allowance for Loan and Lease Losses (Average Recorded Investment Of Impaired Loans And Related Interest Income By Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment $ 218 $ 75 $ 107
Impaired Loans with No Allowance: Interest Income Recognized 6    
Impaired Loans with Allowance: Average Recorded Investment   32  
Impaired Financing Receivable, Average Recorded Investment, Total 218 107 107
Impaired Financing Receivable, Interest Income Recognized, Total 6   3
Home Equity [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Interest Income Recognized     3
Commercial Portfolio [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 15 9 19
Impaired Loans with Allowance: Average Recorded Investment 1,779 59 123
Impaired Financing Receivable, Average Recorded Investment, Total 1,794 68 142
Impaired Financing Receivable, Interest Income Recognized, Total     205
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Interest Income Recognized     205
Commercial Portfolio [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 1,915 820 1,051
Impaired Loans with No Allowance: Interest Income Recognized 279   14
Impaired Loans with Allowance: Average Recorded Investment 1,446 2,177 1,721
Impaired Financing Receivable, Average Recorded Investment, Total 4,012 3,807 3,698
Impaired Financing Receivable, Interest Income Recognized, Total 389 164 364
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 651 810 926
Impaired Loans with No Allowance: Interest Income Recognized 110 164 350
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 164 124  
Impaired Loans with Allowance: Average Recorded Investment 488 48  
Impaired Financing Receivable, Average Recorded Investment, Total 652 172  
Residential Portfolio [Member] | Residential Mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 890 821 816
Impaired Loans with No Allowance: Interest Income Recognized 18 21 8
Impaired Loans with Allowance: Average Recorded Investment   14 25
Impaired Financing Receivable, Average Recorded Investment, Total 1,222 1,213 1,241
Impaired Financing Receivable, Interest Income Recognized, Total 18 25 8
Residential Portfolio [Member] | Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment $ 332 378 $ 400
Impaired Loans with No Allowance: Interest Income Recognized   $ 4