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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment $ 1,801 $ 27 $ 101
Impaired Financing Receivable, Average Recorded Investment, Total 1,802 31 102
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 1 4 1
Commercial Portfolio [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 1,136 178  
Impaired Loans with No Allowance: Interest Income Recognized   3  
Impaired Loans with Allowance: Average Recorded Investment 205 962 4,437
Impaired Financing Receivable, Average Recorded Investment, Total 1,342 1,158 4,460
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 1 18 23
Commercial Portfolio [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 9,379 3,363 3,048
Impaired Loans with No Allowance: Interest Income Recognized 5 20 3
Impaired Loans with Allowance: Average Recorded Investment 752 424 541
Impaired Financing Receivable, Average Recorded Investment, Total 11,554 5,384 5,003
Impaired Financing Receivable, Interest Income Recognized, Total 5 20 26
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 1,423 1,597 1,414
Impaired Loans with No Allowance: Interest Income Recognized     23
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 44 32  
Impaired Loans with Allowance: Average Recorded Investment   147 367
Impaired Financing Receivable, Average Recorded Investment, Total 44 179 367
Residential Portfolio [Member] | Residential Mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Average Recorded Investment 998 854 754
Impaired Loans with No Allowance: Interest Income Recognized 26 30 29
Impaired Financing Receivable, Average Recorded Investment, Total 1,359 1,845 1,586
Impaired Financing Receivable, Interest Income Recognized, Total 26 30 29
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 $ 361 $ 991 $ 832