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Regulatory Capital Textuals (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Regulatory Capital Requirements [Abstract] |
Regulatory Capital, Dividends Without Approval Of Regulators | $ 10.2
Regulatory Capital, Restricted Investment From Dividends | $ 78.6

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- Definition Amount of additional dividends the bank could have declared without prior regulatory approval + References No definition available. + Details
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Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of the parent company's investment in bank that is restricted from transfer as dividends due to regulations on capital + References No definition available. + Details
Name: | aubn_RegulatoryCapitalRestrictedInvestmentFromDividends
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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