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Loans and Allowance for Loan and Lease Losses (Troubled Debt Restructurings) (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 7,471,000 | $ 10,536,000
Financing Receivable, Modifications, Post-Modification Recorded Investment | 7,720,000 | 10,730,000
Financing Receivable, Modifications, Recorded Investment | 6,839,000 | 9,571,000
Home Equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 14,000 | 14,000
Financing Receivable, Modifications, Post-Modification Recorded Investment | 14,000 | 14,000
Financing Receivable, Modifications, Recorded Investment | 3,000 | 4,000
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 4,110,000 | 4,110,000
Financing Receivable, Modifications, Post-Modification Recorded Investment | 4,460,000 | 4,460,000
Financing Receivable, Modifications, Recorded Investment | 4,324,000 | 4,434,000
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 2,670,000 | 5,735,000
Financing Receivable, Modifications, Post-Modification Recorded Investment | 2,571,000 | 5,581,000
Financing Receivable, Modifications, Recorded Investment | 1,984,000 | 4,593,000
Residential Portfolio [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 677,000 | 677,000
Financing Receivable, Modifications, Post-Modification Recorded Investment | 675,000 | 675,000
Financing Receivable, Modifications, Recorded Investment | $ 528,000 | $ 540,000

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