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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment $ 25 $ 260
Impaired Loans with No Allowance: Unpaid Principal Balance 126 295
Impaired Loans: Total Recorded Investment 29 260
Impaired Loans: Total Unpaid Principal Balance 130 295
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 4  
Impaired Loans with No Allowance: Unpaid Principal Balance 4  
Commercial Portfolio [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Unpaid Principal Balance   13
Impaired Loans with Allowance: Recorded Investment 4,527 4,434
Impaired Loans with Allowance: Unpaid Principal Balance 4,635 4,460
Impaired Loans with Allowance: Related Allowance 489 136
Impaired Loans: Total Recorded Investment 4,555 4,434
Impaired Loans: Total Unpaid Principal Balance 4,663 4,473
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 28  
Impaired Loans with No Allowance: Unpaid Principal Balance 28  
Commercial Portfolio [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 2,033 3,424
Impaired Loans with No Allowance: Unpaid Principal Balance 2,553 4,056
Impaired Loans with Allowance: Recorded Investment 857 1,423
Impaired Loans with Allowance: Unpaid Principal Balance 872 1,589
Impaired Loans with Allowance: Related Allowance 243 293
Impaired Loans: Total Recorded Investment 4,346 5,402
Impaired Loans: Total Unpaid Principal Balance 4,881 6,200
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 1,456 555
Impaired Loans with No Allowance: Unpaid Principal Balance 1,456 555
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment 367 487
Impaired Loans with Allowance: Unpaid Principal Balance 370 492
Impaired Loans with Allowance: Related Allowance 38 100
Impaired Loans: Total Recorded Investment 367 487
Impaired Loans: Total Unpaid Principal Balance 370 492
Residential Portfolio [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 832 760
Impaired Loans with No Allowance: Unpaid Principal Balance 940 877
Impaired Loans: Total Recorded Investment 2,096 1,066
Impaired Loans: Total Unpaid Principal Balance 2,204 1,183
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 1,264 306
Impaired Loans with No Allowance: Unpaid Principal Balance $ 1,264 $ 306