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Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative, Notional Amount1	$ 9,158aubn_DerivativeNotionalAmount1	$ 9,334aubn_DerivativeNotionalAmount1
DerivativeAssetFairValueGrossAsset	613us-gaap_DerivativeFairValueOfDerivativeAsset	634us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative Asset, Fair Value, Gross Liability	613us-gaap_DerivativeAssetFairValueGrossLiability	634us-gaap_DerivativeAssetFairValueGrossLiability
Derivative, Interest Rate Swap, Pay Fixed, Receive Variable [Member]
Derivative [Line Items]
Derivative, Notional Amount1	4,579aubn_DerivativeNotionalAmount1 / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayFixedReceiveVariableMember	4,667aubn_DerivativeNotionalAmount1 / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayFixedReceiveVariableMember
DerivativeAssetFairValueGrossAsset	0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayFixedReceiveVariableMember	0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayFixedReceiveVariableMember
Derivative Asset, Fair Value, Gross Liability	613us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayFixedReceiveVariableMember	634us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayFixedReceiveVariableMember
Derivative, Interest Rate Swap, Pay Variable, Receive Fixed [Member]
Derivative [Line Items]
Derivative, Notional Amount1	4,579aubn_DerivativeNotionalAmount1 / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayVariableReceiveFixedMember	4,667aubn_DerivativeNotionalAmount1 / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayVariableReceiveFixedMember
DerivativeAssetFairValueGrossAsset	613us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayVariableReceiveFixedMember	634us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayVariableReceiveFixedMember
Derivative Asset, Fair Value, Gross Liability	$ 0us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayVariableReceiveFixedMember	$ 0us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeByNatureAxis = aubn_DerivativeInterestRateSwapPayVariableReceiveFixedMember

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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- Definition

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226003-175313



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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X

- Definition

Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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