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Derivative Financial Instruments (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) contract | Dec. 31, 2015 USD ($)
Derivative [Line Items] |  |
Interest rate swap fair value (asset) | $ 700 |
Interest rate swap fair value |  | $ (66)
Gain on derivative | 766 |
Deferred tax asset on gain on derivative | $ 305 |
Cash flow hedge ineffectiveness | Interest rate swap agreements are entered into with counterparties that meet established credit standards and the Corporation believes that the credit risk inherent in these contracts is not significant as of December 31, 2016. |
Cash Flow Hedge [Member] |  |
Derivative [Line Items] |  |
Interest rate swap notional amount | $ 30,000 |
Number of interest rate swap contracts | contract | 4 |
Derivative Matured [Member] |  |
Derivative [Line Items] |  |
Interest rate swap notional amount | $ 20,000 |
Number of interest rate swap contracts | contract | 3 |
Derivative, maturity date | Jun. 17, 2016 |
Swap Contract 3 Year 5 Million [Member] |  |
Derivative [Line Items] |  |
Interest rate swap notional amount | $ 5,000 |
Derivative, maturity date | Jun. 17, 2019 |
Swap Contract 5 Year $5 Million [Member] |  |
Derivative [Line Items] |  |
Interest rate swap notional amount | $ 5,000 |
Derivative, maturity date | Mar. 17, 2021 |
Swap Contract- 7 year $5 Million [Member] |  |
Derivative [Line Items] |  |
Interest rate swap notional amount | $ 5,000 |
Derivative, maturity date | Mar. 17, 2023 |
Swap Contract 10 Year $15 Million [Member] |  |
Derivative [Line Items] |  |
Interest rate swap notional amount | $ 15,000 |
Derivative, maturity date | Mar. 17, 2026 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References 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 + Details
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- Definition A disclosure of an assertion that the amount of cash flow hedge ineffectiveness is immaterial. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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