Allowance for Loan Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	$ 4,643	$ 4,289
Financing Receivable, Allowance for Credit Losses, Charge-offs	(596)	(540)
Financing Receivable, Allowance for Credit Losses, Recoveries	1,010	1,379
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	414	839
Provision for loan losses	(300)	(485)
Financing Receivable, Allowance for Credit Losses	4,757	4,643
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	540	523
Financing Receivable, Allowance for Credit Losses, Charge-offs	(449)	(97)
Financing Receivable, Allowance for Credit Losses, Recoveries	461	29
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	12	(68)
Provision for loan losses	101	85
Financing Receivable, Allowance for Credit Losses	653	540
Construction And Land Development Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	812	669
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	0
Financing Receivable, Allowance for Credit Losses, Recoveries	347	1,212
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	347	1,212
Provision for loan losses	(425)	(1,069)
Financing Receivable, Allowance for Credit Losses	734	812
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	2,071	1,879
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	(194)
Financing Receivable, Allowance for Credit Losses, Recoveries	0	0
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	0	(194)
Provision for loan losses	55	386
Financing Receivable, Allowance for Credit Losses	2,126	2,071
Residential Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,107	1,059
Financing Receivable, Allowance for Credit Losses, Charge-offs	(107)	(182)
Financing Receivable, Allowance for Credit Losses, Recoveries	115	127
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	8	(55)
Provision for loan losses	(44)	103
Financing Receivable, Allowance for Credit Losses	1,071	1,107
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	113	159
Financing Receivable, Allowance for Credit Losses, Charge-offs	(40)	(67)
Financing Receivable, Allowance for Credit Losses, Recoveries	87	11
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	47	(56)
Provision for loan losses	13	10
Financing Receivable, Allowance for Credit Losses	$ 173	$ 113

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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- 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=66008989&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=66902209&loc=d3e3602-108585

+ Details

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Period Type:	duration

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