Trouble Debt Restructing Modified (Details) - Jun. 30, 2015 $ in Thousands	USD ($)	USD ($)
Financing Receivable Trouble Debt Restructing Modifications [Line Items]
Modification number of contracts	1	3
Pre-modification outstanding recorded investment	$ 61	$ 769
Post -modification outstanding recorded investment	$ 66	$ 771
Commercial and Industrial Loans [Member]
Financing Receivable Trouble Debt Restructing Modifications [Line Items]
Modification number of contracts	1	1
Pre-modification outstanding recorded investment	$ 61	$ 61
Post -modification outstanding recorded investment	$ 66	$ 66
Construction And Land Development Loans [Member]
Financing Receivable Trouble Debt Restructing Modifications [Line Items]
Modification number of contracts		1
Pre-modification outstanding recorded investment		$ 116
Post -modification outstanding recorded investment		$ 113
Commercial Real Estate Other Loans [Member]
Financing Receivable Trouble Debt Restructing Modifications [Line Items]
Modification number of contracts		1
Pre-modification outstanding recorded investment		$ 592
Post -modification outstanding recorded investment		$ 592
Commercial Real Estate Loans, Total [Member]
Financing Receivable Trouble Debt Restructing Modifications [Line Items]
Modification number of contracts		1
Pre-modification outstanding recorded investment		$ 592
Post -modification outstanding recorded investment		$ 592

No definition available.

Name:	aubn_FinancingReceivableTroubleDebtRestructuringModificationsLineItems
Namespace Prefix:	aubn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivableTroubledDebtRestructuringAxis=aubn_CommercialAndIndustrialLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableTroubledDebtRestructuringAxis=aubn_ConstructionAndLandDevelopmentLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableTroubledDebtRestructuringAxis=aubn_CommercialRealEstateOtherLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableTroubledDebtRestructuringAxis=aubn_CommercialRealEstateLoansTotalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: