Allowance for Loan Loss (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 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	(144)	(135)
Financing Receivable, Allowance for Credit Losses, Recoveries	1,229	21
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	1,085	(114)
Provision for loan losses	(600)	0
Financing Receivable, Allowance for Credit Losses	4,774	4,722
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	0	(58)
Financing Receivable, Allowance for Credit Losses, Recoveries	20	1
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	20	(57)
Provision for loan losses	(26)	62
Financing Receivable, Allowance for Credit Losses	517	644
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	1,198	5
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	1,198	5
Provision for loan losses	(1,173)	(149)
Financing Receivable, Allowance for Credit Losses	694	830
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	0	0
Financing Receivable, Allowance for Credit Losses, Recoveries	0	0
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	0	0
Provision for loan losses	525	(40)
Financing Receivable, Allowance for Credit Losses	2,404	1,888
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	(118)	(60)
Financing Receivable, Allowance for Credit Losses, Recoveries	7	14
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(111)	(46)
Provision for loan losses	78	80
Financing Receivable, Allowance for Credit Losses	1,026	1,153
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	(26)	(17)
Financing Receivable, Allowance for Credit Losses, Recoveries	4	1
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(22)	(16)
Provision for loan losses	(4)	47
Financing Receivable, Allowance for Credit Losses	$ 133	$ 207

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_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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=35738203&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=31042434&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 11
-Article 9

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

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- Details

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