Allowance for Loan Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	$ 4,289	$ 4,836
Financing Receivable, Allowance for Credit Losses, Charge-offs	(540)	(1,114)
Financing Receivable, Allowance for Credit Losses, Recoveries	1,379	367
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	839	(747)
Provision for loan losses	(485)	200
Financing Receivable, Allowance for Credit Losses	4,643	4,289
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	523	639
Financing Receivable, Allowance for Credit Losses, Charge-offs	(97)	(100)
Financing Receivable, Allowance for Credit Losses, Recoveries	29	22
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(68)	(78)
Provision for loan losses	85	(38)
Financing Receivable, Allowance for Credit Losses	540	523
Construction And Land Development Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	669	974
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	0
Financing Receivable, Allowance for Credit Losses, Recoveries	1,212	17
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	1,212	17
Provision for loan losses	(1,069)	(322)
Financing Receivable, Allowance for Credit Losses	812	669
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,879	1,928
Financing Receivable, Allowance for Credit Losses, Charge-offs	(194)	(866)
Financing Receivable, Allowance for Credit Losses, Recoveries	0	0
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(194)	(866)
Provision for loan losses	386	817
Financing Receivable, Allowance for Credit Losses	2,071	1,879
Residential Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,059	1,119
Financing Receivable, Allowance for Credit Losses, Charge-offs	(182)	(89)
Financing Receivable, Allowance for Credit Losses, Recoveries	127	313
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(55)	224
Provision for loan losses	103	(284)
Financing Receivable, Allowance for Credit Losses	1,107	1,059
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	159	176
Financing Receivable, Allowance for Credit Losses, Charge-offs	(67)	(59)
Financing Receivable, Allowance for Credit Losses, Recoveries	11	15
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(56)	(44)
Provision for loan losses	10	27
Financing Receivable, Allowance for Credit Losses	$ 113	$ 159

No definition available.

Name:	aubn_FinancingReceivableAllowanceForCreditLossesNetChargeoffsRecoveries
Namespace Prefix:	aubn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

+ Details

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

- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

+ Details

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

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

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Balance Type:	debit
Period Type:	duration

- Details

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