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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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
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