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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment $ 183 $ 260
Impaired Loans with No Allowance: Unpaid Principal Balance 294 295
Impaired Loans: Total Recorded Investment 183 260
Impaired Loans: Total Unpaid Principal Balance 294 295
Commercial Portfolio [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Unpaid Principal Balance 12 13
Impaired Loans with Allowance: Recorded Investment 4,374 4,434
Impaired Loans with Allowance: Unpaid Principal Balance 4,460 4,460
Impaired Loans with Allowance: Related Allowance 265 136
Impaired Loans: Total Recorded Investment 4,397 4,434
Impaired Loans: Total Unpaid Principal Balance 4,495 4,473
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 23  
Impaired Loans with No Allowance: Unpaid Principal Balance 23  
Commercial Portfolio [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 3,588 3,424
Impaired Loans with No Allowance: Unpaid Principal Balance 4,233 4,056
Impaired Loans with Allowance: Recorded Investment 1,389 1,423
Impaired Loans with Allowance: Unpaid Principal Balance 1,577 1,589
Impaired Loans with Allowance: Related Allowance 281 293
Impaired Loans: Total Recorded Investment 6,420 5,402
Impaired Loans: Total Unpaid Principal Balance 7,253 6,200
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 1,443 555
Impaired Loans with No Allowance: Unpaid Principal Balance 1,443 555
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment 487 487
Impaired Loans with Allowance: Unpaid Principal Balance 492 492
Impaired Loans with Allowance: Related Allowance 93 100
Impaired Loans: Total Recorded Investment 487 487
Impaired Loans: Total Unpaid Principal Balance 492 492
Residential Portfolio [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 669 760
Impaired Loans with No Allowance: Unpaid Principal Balance 790 877
Impaired Loans: Total Recorded Investment 1,358 1,066
Impaired Loans: Total Unpaid Principal Balance 1,479 1,183
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 689 306
Impaired Loans with No Allowance: Unpaid Principal Balance $ 689 $ 306