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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment $ 261 $ 111
Impaired Loans with No Allowance: Unpaid Principal Balance 296 129
Impaired Loans with Allowance: Recorded Investment   29
Impaired Loans with Allowance: Unpaid Principal Balance   49
Impaired Loans with Allowance: Related Allowance   1
Impaired Loans: Total Recorded Investment 261 140
Impaired Loans: Total Unpaid Principal Balance 296 178
Commercial Portfolio [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment   4
Impaired Loans with No Allowance: Unpaid Principal Balance 15 9
Impaired Loans with Allowance: Recorded Investment 4,460 56
Impaired Loans with Allowance: Unpaid Principal Balance 4,460 62
Impaired Loans with Allowance: Related Allowance 150 6
Impaired Loans: Total Recorded Investment 4,460 60
Impaired Loans: Total Unpaid Principal Balance 4,475 71
Commercial Portfolio [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 603 726
Impaired Loans with No Allowance: Unpaid Principal Balance 1,288 1,792
Impaired Loans with Allowance: Recorded Investment 1,545 2,520
Impaired Loans with Allowance: Unpaid Principal Balance 1,691 2,646
Impaired Loans with Allowance: Related Allowance 375 711
Impaired Loans: Total Recorded Investment 2,717 4,088
Impaired Loans: Total Unpaid Principal Balance 3,548 5,280
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 569 842
Impaired Loans with No Allowance: Unpaid Principal Balance 569 842
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment   618
Impaired Loans with No Allowance: Unpaid Principal Balance   618
Impaired Loans with Allowance: Recorded Investment 487 242
Impaired Loans with Allowance: Unpaid Principal Balance 492 242
Impaired Loans with Allowance: Related Allowance 100 72
Impaired Loans: Total Recorded Investment 487 860
Impaired Loans: Total Unpaid Principal Balance 492 860
Residential Portfolio [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 790 848
Impaired Loans with No Allowance: Unpaid Principal Balance 826 882
Impaired Loans with Allowance: Recorded Investment 66 68
Impaired Loans with Allowance: Unpaid Principal Balance 68 68
Impaired Loans with Allowance: Related Allowance 66 68
Impaired Loans: Total Recorded Investment 1,171 1,305
Impaired Loans: Total Unpaid Principal Balance 1,209 1,339
Residential Portfolio [Member] | Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 315 389
Impaired Loans with No Allowance: Unpaid Principal Balance $ 315 $ 389