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Letters of Credit and Off Balance Sheet Liabilities (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Letters of Credit and Off Balance Sheet Liabilities [Abstract] |  |
Outstanding standby letters of credit | $ 2.7 | $ 2.6

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
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Balance Type: | credit
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