Derivative Financial Instruments (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Short-term Debt [Member] \| Cash Flow Hedges [Member]
Derivative [Line Items]
Notional Amount	$ 110,000	$ 110,000
Derivative Fair Value, Asset	0	0
Derivative Fair Value, Liability	1,116	2,057
Net Ineffectiveness Hedge Gains/(Losses)	0	0
Commercial Real Estate [Member] \| Fair Value Hedges [Member]
Derivative [Line Items]
Notional Amount	19,826	19,965
Derivative Fair Value, Asset	764	312
Derivative Fair Value, Liability	0	0
Net Ineffectiveness Hedge Gains/(Losses)	$ 0	$ 0

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value of all derivative assets designated as fair value hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

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- Definition

Fair value of all derivative liabilities designated as fair value hedging instruments.

+ References

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- Definition

Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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