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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment $ 29 $ 30
Impaired Loans with No Allowance: Unpaid Principal Balance 55 106
Impaired Loans: Total Recorded Investment 33 34
Impaired Loans: Total Unpaid Principal Balance 59 110
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 205 4,527
Impaired Loans with Allowance: Unpaid Principal Balance 205 4,635
Impaired Loans with Allowance: Related Allowance 205 500
Impaired Loans: Total Recorded Investment 234 4,555
Impaired Loans: Total Unpaid Principal Balance 234 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 29 28
Impaired Loans with No Allowance: Unpaid Principal Balance 29 28
Commercial Portfolio [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 1,995 2,007
Impaired Loans with No Allowance: Unpaid Principal Balance 2,342 2,276
Impaired Loans with Allowance: Recorded Investment 832 721
Impaired Loans with Allowance: Unpaid Principal Balance 832 721
Impaired Loans with Allowance: Related Allowance 243 204
Impaired Loans: Total Recorded Investment 4,415 4,291
Impaired Loans: Total Unpaid Principal Balance 4,762 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 1,588 1,563
Impaired Loans with No Allowance: Unpaid Principal Balance 1,588 1,563
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment 367 367
Impaired Loans with Allowance: Unpaid Principal Balance 370 370
Impaired Loans with Allowance: Related Allowance 38 38
Impaired Loans: Total Recorded Investment 367 367
Impaired Loans: Total Unpaid Principal Balance 370 370
Residential Portfolio [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 905 657
Impaired Loans with No Allowance: Unpaid Principal Balance 951 811
Impaired Loans: Total Recorded Investment 2,116 1,865
Impaired Loans: Total Unpaid Principal Balance 2,162 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 1,211 1,208
Impaired Loans with No Allowance: Unpaid Principal Balance $ 1,211 $ 1,208