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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
Mar. 31, 2018
Mar. 31, 2017
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment $ 222 $ 122
Impaired Loans with No Allowance: Interest Income Recognized   2
Impaired Financing Receivable, Average Recorded Investment, Total 222 122
Impaired Financing Receivable, Interest Income Recognized, Total   2
Commercial Portfolio [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment   2
Impaired Loans with Allowance: Average Recorded Investment 4,404 35
Impaired Financing Receivable, Average Recorded Investment, Total 4,421 37
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 17  
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment   617
Impaired Loans with Allowance: Average Recorded Investment 487 241
Impaired Financing Receivable, Average Recorded Investment, Total 487 858
Commercial Portfolio [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 3,506 403
Impaired Loans with No Allowance: Interest Income Recognized   279
Impaired Loans with Allowance: Average Recorded Investment 1,406 2,676
Impaired Financing Receivable, Average Recorded Investment, Total 5,848 3,910
Impaired Financing Receivable, Interest Income Recognized, Total   279
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 936 831
Residential Portfolio [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 714 864
Impaired Loans with No Allowance: Interest Income Recognized   11
Impaired Loans with Allowance: Average Recorded Investment   67
Impaired Financing Receivable, Average Recorded Investment, Total 1,157 1,304
Impaired Financing Receivable, Interest Income Recognized, Total   11
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 $ 443 $ 373