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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
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Home Equity [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment $ 17 $ 294 $ 148 $ 184
Impaired Loans with No Allowance: Interest Income Recognized   3   5
Impaired Financing Receivable, Average Recorded Investment, Total 18 294 148 184
Impaired Financing Receivable, Interest Income Recognized, Total   3   5
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 1      
Commercial Portfolio [Member] | Commercial and Industrial [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment       16
Impaired Loans with Allowance: Average Recorded Investment 4,425 2,230 4,424 892
Impaired Financing Receivable, Average Recorded Investment, Total 4,449 2,230 4,445 908
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 24   21  
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment   42   164
Impaired Loans with Allowance: Average Recorded Investment 367 487 367 390
Impaired Financing Receivable, Average Recorded Investment, Total 367 529 367 554
Commercial Portfolio [Member] | Commercial Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 1,872 751 3,040 551
Impaired Loans with No Allowance: Interest Income Recognized     3 279
Impaired Loans with Allowance: Average Recorded Investment 703 2,148 456 2,446
Impaired Financing Receivable, Average Recorded Investment, Total 4,045 3,469 4,861 3,679
Impaired Financing Receivable, Interest Income Recognized, Total 7   26 389
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 1,470 570 1,365 682
Impaired Loans with No Allowance: Interest Income Recognized 7   23 110
Residential Portfolio [Member] | Residential Mortgage [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 780 847 769 852
Impaired Loans with No Allowance: Interest Income Recognized 11   27 18
Impaired Loans with Allowance: Average Recorded Investment   66   53
Impaired Financing Receivable, Average Recorded Investment, Total 1,457 1,231 1,495 1,244
Impaired Financing Receivable, Interest Income Recognized, Total 11   27 18
Residential Portfolio [Member] | Residential Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment $ 677 $ 318 $ 726 $ 339