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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | $ 26 | $ 30
Impaired Loans with No Allowance: Unpaid Principal Balance | 27 | 106
Impaired Loans: Total Recorded Investment | 30 | 34
Impaired Loans: Total Unpaid Principal Balance | 31 | 110
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 4 | 4
Impaired Loans with No Allowance: Unpaid Principal Balance | 4 | 4
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Recorded Investment |  | 4,527
Impaired Loans with Allowance: Unpaid Principal Balance |  | 4,635
Impaired Loans with Allowance: Related Allowance |  | 500
Impaired Loans: Total Recorded Investment | 5 | 4,555
Impaired Loans: Total Unpaid Principal Balance | 5 | 4,663
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 | 5 | 28
Impaired Loans with No Allowance: Unpaid Principal Balance | 5 | 28
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 1,787 | 2,007
Impaired Loans with No Allowance: Unpaid Principal Balance | 2,087 | 2,276
Impaired Loans with Allowance: Recorded Investment | 537 | 721
Impaired Loans with Allowance: Unpaid Principal Balance | 578 | 721
Impaired Loans with Allowance: Related Allowance | 336 | 204
Impaired Loans: Total Recorded Investment | 3,967 | 4,291
Impaired Loans: Total Unpaid Principal Balance | 4,308 | 4,560
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 | 1,643 | 1,563
Impaired Loans with No Allowance: Unpaid Principal Balance | 1,643 | 1,563
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 40 |
Impaired Loans with No Allowance: Unpaid Principal Balance | 61 |
Impaired Loans with Allowance: Recorded Investment |  | 367
Impaired Loans with Allowance: Unpaid Principal Balance |  | 370
Impaired Loans with Allowance: Related Allowance |  | 38
Impaired Loans: Total Recorded Investment | 40 | 367
Impaired Loans: Total Unpaid Principal Balance | 61 | 370
Residential Portfolio [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 881 | 657
Impaired Loans with No Allowance: Unpaid Principal Balance | 896 | 811
Impaired Loans: Total Recorded Investment | 1,375 | 1,865
Impaired Loans: Total Unpaid Principal Balance | 1,390 | 2,019
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 | 494 | 1,208
Impaired Loans with No Allowance: Unpaid Principal Balance | $ 494 | $ 1,208

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