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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Home Equity [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment $ 294 $ 62 $ 184 $ 59
Impaired Loans with No Allowance: Interest Income Recognized 3   5  
Impaired Loans with Allowance: Average Recorded Investment   31   33
Impaired Financing Receivable, Average Recorded Investment, Total 294 93 184 92
Impaired Financing Receivable, Interest Income Recognized, Total 3   5  
Commercial Portfolio [Member] | Commercial and Industrial [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment   8 16 12
Impaired Loans with Allowance: Average Recorded Investment 2,230 469 892 224
Impaired Financing Receivable, Average Recorded Investment, Total 2,230 477 908 236
Commercial Portfolio [Member] | Commercial Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 751 797 551 865
Impaired Loans with No Allowance: Interest Income Recognized     279  
Impaired Loans with Allowance: Average Recorded Investment 2,148 2,643 2,446 2,036
Impaired Financing Receivable, Average Recorded Investment, Total 2,899 4,405 2,997 3,845
Impaired Financing Receivable, Interest Income Recognized, Total     389  
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   965   944
Impaired Loans with No Allowance: Interest Income Recognized     110  
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 487   390  
Impaired Financing Receivable, Average Recorded Investment, Total 529   554  
Residential Portfolio [Member] | Residential Mortgage [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance: Average Recorded Investment 847 834 852 802
Impaired Loans with No Allowance: Interest Income Recognized   6 18 15
Impaired Loans with Allowance: Average Recorded Investment 66   53  
Impaired Financing Receivable, Average Recorded Investment, Total $ 913 1,210 905 1,177
Impaired Financing Receivable, Interest Income Recognized, Total   6 $ 18 19
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   $ 376   375
Impaired Loans with No Allowance: Interest Income Recognized       $ 4