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Regulatory Capital Textuals (Details) $ in Millions	Dec. 31, 2018 USD ($)
Regulatory Capital Requirements [Abstract]
Regulatory Capital, Dividends Without Approval Of Regulators	$ 8.0
Regulatory Capital, Restricted Investment From Dividends	$ 79.9

X

- 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

X

- 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