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Long-Term Debt Textuals (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Long-term debt: |  |
Qualifying Residential Mortgages Pledged For Long-Term Advances | $ 31.9 | $ 35.4

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Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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