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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment $ 27 $ 101 $ 218
Impaired Loans with No Allowance: Interest Income Recognized     6
Impaired Financing Receivable, Average Recorded Investment, Total 31 102 218
Impaired Financing Receivable, Interest Income Recognized, Total     6
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 4 1  
Commercial Portfolio [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 178   15
Impaired Loans with No Allowance: Interest Income Recognized 3    
Impaired Loans with Allowance: Average Recorded Investment 962 4,437 1,779
Impaired Financing Receivable, Average Recorded Investment, Total 1,158 4,460 1,794
Impaired Financing Receivable, Interest Income Recognized, Total 3    
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 18 23  
Commercial Portfolio [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 3,363 3,048 1,915
Impaired Loans with No Allowance: Interest Income Recognized 20 3 279
Impaired Loans with Allowance: Average Recorded Investment 424 541 1,446
Impaired Financing Receivable, Average Recorded Investment, Total 5,384 5,003 4,012
Impaired Financing Receivable, Interest Income Recognized, Total 20 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 1,597 1,414 651
Impaired Loans with No Allowance: Interest Income Recognized   23 110
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 32   164
Impaired Loans with Allowance: Average Recorded Investment 147 367 488
Impaired Financing Receivable, Average Recorded Investment, Total 179 367 652
Residential Portfolio [Member] | Residential Mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 854 754 890
Impaired Loans with No Allowance: Interest Income Recognized 30 29 18
Impaired Financing Receivable, Average Recorded Investment, Total 1,845 1,586 1,222
Impaired Financing Receivable, Interest Income Recognized, Total 30 29 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 $ 991 $ 832 $ 332