Allowance for Loan Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	$ 4,836	$ 5,268
Financing Receivable, Allowance for Credit Losses, Charge-offs	(1,114)	(808)
Financing Receivable, Allowance for Credit Losses, Recoveries	367	326
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(747)	(482)
Provision for loan losses	200	50
Financing Receivable, Allowance for Credit Losses	4,289	4,836
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	639	386
Financing Receivable, Allowance for Credit Losses, Charge-offs	(100)	(46)
Financing Receivable, Allowance for Credit Losses, Recoveries	22	71
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(78)	25
Provision for loan losses	(38)	228
Financing Receivable, Allowance for Credit Losses	523	639
Construction And Land Development Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	974	366
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	(235)
Financing Receivable, Allowance for Credit Losses, Recoveries	17	8
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	17	(227)
Provision for loan losses	(322)	835
Financing Receivable, Allowance for Credit Losses	669	974
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,928	3,186
Financing Receivable, Allowance for Credit Losses, Charge-offs	(866)	0
Financing Receivable, Allowance for Credit Losses, Recoveries	0	119
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(866)	119
Provision for loan losses	817	(1,377)
Financing Receivable, Allowance for Credit Losses	1,879	1,928
Residential Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,119	1,114
Financing Receivable, Allowance for Credit Losses, Charge-offs	(89)	(438)
Financing Receivable, Allowance for Credit Losses, Recoveries	313	112
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	224	(326)
Provision for loan losses	(284)	331
Financing Receivable, Allowance for Credit Losses	1,059	1,119
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	176	216
Financing Receivable, Allowance for Credit Losses, Charge-offs	(59)	(89)
Financing Receivable, Allowance for Credit Losses, Recoveries	15	16
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(44)	(73)
Provision for loan losses	27	33
Financing Receivable, Allowance for Credit Losses	$ 159	$ 176

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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- 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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Balance Type:	debit
Period Type:	duration

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