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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment $ 327 $ 111
Impaired Loans with No Allowance: Unpaid Principal Balance 369 129
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 327 140
Impaired Loans: Total Unpaid Principal Balance 369 178
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 18 9
Impaired Loans with Allowance: Recorded Investment   56
Impaired Loans with Allowance: Unpaid Principal Balance   62
Impaired Loans with Allowance: Related Allowance   6
Impaired Loans: Total Recorded Investment   60
Impaired Loans: Total Unpaid Principal Balance 18 71
Commercial Portfolio [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 900 726
Impaired Loans with No Allowance: Unpaid Principal Balance 1,390 1,792
Impaired Loans with Allowance: Recorded Investment 2,751 2,520
Impaired Loans with Allowance: Unpaid Principal Balance 2,915 2,646
Impaired Loans with Allowance: Related Allowance 893 711
Impaired Loans: Total Recorded Investment 4,224 4,088
Impaired Loans: Total Unpaid Principal Balance 4,878 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 573 842
Impaired Loans with No Allowance: Unpaid Principal Balance 573 842
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 331 618
Impaired Loans with No Allowance: Unpaid Principal Balance 334 618
Impaired Loans with Allowance: Recorded Investment 240 242
Impaired Loans with Allowance: Unpaid Principal Balance 242 242
Impaired Loans with Allowance: Related Allowance 70 72
Impaired Loans: Total Recorded Investment 571 860
Impaired Loans: Total Unpaid Principal Balance 576 860
Residential Portfolio [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 902 848
Impaired Loans with No Allowance: Unpaid Principal Balance 931 882
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 1,292 1,305
Impaired Loans: Total Unpaid Principal Balance 1,323 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 324 389
Impaired Loans with No Allowance: Unpaid Principal Balance $ 324 $ 389