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Loans and Allowance for Loan and Lease Losses (Troubled Debt Restructurings) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 10,536,000	$ 10,536,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	10,730,000	10,730,000
Financing Receivable, Modifications, Recorded Investment	9,446,000	9,571,000
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	14,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	14,000
Financing Receivable, Modifications, Recorded Investment	3,000
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	4,374,000	4,434,000
Commercial Portfolio [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	5,735,000	5,735,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	5,581,000	5,581,000
Financing Receivable, Modifications, Recorded Investment	4,535,000	4,593,000
Residential Portfolio [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	677,000	691,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	675,000	689,000
Financing Receivable, Modifications, Recorded Investment	$ 534,000	$ 544,000

X

- Definition

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+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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