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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment $ 260 $ 111
Impaired Loans with No Allowance: Unpaid Principal Balance 295 129
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 260 140
Impaired Loans: Total Unpaid Principal Balance 295 178
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 13 9
Impaired Loans with Allowance: Recorded Investment 4,434 56
Impaired Loans with Allowance: Unpaid Principal Balance 4,460 62
Impaired Loans with Allowance: Related Allowance 136 6
Impaired Loans: Total Recorded Investment 4,434 60
Impaired Loans: Total Unpaid Principal Balance 4,473 71
Commercial Portfolio [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 3,424 726
Impaired Loans with No Allowance: Unpaid Principal Balance 4,056 1,792
Impaired Loans with Allowance: Recorded Investment 1,423 2,520
Impaired Loans with Allowance: Unpaid Principal Balance 1,589 2,646
Impaired Loans with Allowance: Related Allowance 293 711
Impaired Loans: Total Recorded Investment 5,402 4,088
Impaired Loans: Total Unpaid Principal Balance 6,200 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 555 842
Impaired Loans with No Allowance: Unpaid Principal Balance 555 842
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 760 848
Impaired Loans with No Allowance: Unpaid Principal Balance 877 882
Impaired Loans with Allowance: Recorded Investment   68
Impaired Loans with Allowance: Unpaid Principal Balance   68
Impaired Loans with Allowance: Related Allowance   68
Impaired Loans: Total Recorded Investment 1,066 1,305
Impaired Loans: Total Unpaid Principal Balance 1,183 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 306 389
Impaired Loans with No Allowance: Unpaid Principal Balance $ 306 $ 389