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Short-term Borrowings Textuals (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Short-term Debt: |  |
Federal Funds, Borrowing Capacity | $ 41.0 |
Available For Sale Securities Pledged As Collateral For Securities Sold Under Agreements to Repurchase | $ 5.8 | $ 6.0

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- Definition The fair value of available-for-sale securities that serve as collateral for securuties under agreement to repurchase. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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