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Subsequent Events Textuals (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Subsequent Event [Abstract]
Collateral Dependent Loan Recorded Investment Paid In Full	$ 1.3
Collateral Dependent Loan Recorded Investment Paid In Full Related Allowance	$ 0.5

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- References

No definition available.

+ Details

Name:	aubn_CollateralDependentLoanRecordedInvestmentPaidInFull
Namespace Prefix:	aubn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration