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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment $ 26 $ 30
Impaired Loans with No Allowance: Unpaid Principal Balance 27 106
Impaired Loans: Total Recorded Investment 30 34
Impaired Loans: Total Unpaid Principal Balance 31 110
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 4 4
Impaired Loans with No Allowance: Unpaid Principal Balance 4 4
Commercial Portfolio [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment   4,527
Impaired Loans with Allowance: Unpaid Principal Balance   4,635
Impaired Loans with Allowance: Related Allowance   500
Impaired Loans: Total Recorded Investment 5 4,555
Impaired Loans: Total Unpaid Principal Balance 5 4,663
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 5 28
Impaired Loans with No Allowance: Unpaid Principal Balance 5 28
Commercial Portfolio [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 1,787 2,007
Impaired Loans with No Allowance: Unpaid Principal Balance 2,087 2,276
Impaired Loans with Allowance: Recorded Investment 537 721
Impaired Loans with Allowance: Unpaid Principal Balance 578 721
Impaired Loans with Allowance: Related Allowance 336 204
Impaired Loans: Total Recorded Investment 3,967 4,291
Impaired Loans: Total Unpaid Principal Balance 4,308 4,560
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 1,643 1,563
Impaired Loans with No Allowance: Unpaid Principal Balance 1,643 1,563
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 40  
Impaired Loans with No Allowance: Unpaid Principal Balance 61  
Impaired Loans with Allowance: Recorded Investment   367
Impaired Loans with Allowance: Unpaid Principal Balance   370
Impaired Loans with Allowance: Related Allowance   38
Impaired Loans: Total Recorded Investment 40 367
Impaired Loans: Total Unpaid Principal Balance 61 370
Residential Portfolio [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 881 657
Impaired Loans with No Allowance: Unpaid Principal Balance 896 811
Impaired Loans: Total Recorded Investment 1,375 1,865
Impaired Loans: Total Unpaid Principal Balance 1,390 2,019
Residential Portfolio [Member] | Residential Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 494 1,208
Impaired Loans with No Allowance: Unpaid Principal Balance $ 494 $ 1,208