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Short-term Borrowings Textuals (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Short-term Debt:
Federal Funds, Borrowing Capacity	$ 41.0
Available For Sale Securities Pledged As Collateral For Securities Sold Under Agreements to Repurchase	$ 2.6	$ 5.6

X

- Definition

The fair value of available-for-sale securities that serve as collateral for securuties under agreement to repurchase.

+ References

No definition available.

+ Details

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Namespace Prefix:	aubn_
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Balance Type:	credit
Period Type:	instant

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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