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Troubled Debt Restructuring Accrual Status (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable Trouble Debt Restructuring Accrual Status [Line Items] |  |
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing | $ 2,248aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing | $ 2,249aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual | 1,019aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual | 1,022aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual
Impaired Financing Receivable, Trouble Debt Structuring, Total | 3,267aubn_ImpairedFinancingReceivableTroubleDebtStructuring | 3,271aubn_ImpairedFinancingReceivableTroubleDebtStructuring
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses | 184aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses | 194aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses
Commercial and Industrial Loans [Member] |  |
Financing Receivable Trouble Debt Restructuring Accrual Status [Line Items] |  |
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing | 61aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialAndIndustrialLoansMember | 70aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialAndIndustrialLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialAndIndustrialLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialAndIndustrialLoansMember
Impaired Financing Receivable, Trouble Debt Structuring, Total | 61aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialAndIndustrialLoansMember | 70aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialAndIndustrialLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialAndIndustrialLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialAndIndustrialLoansMember
Construction And Land Development Loans [Member] |  |
Financing Receivable Trouble Debt Restructuring Accrual Status [Line Items] |  |
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual | 618aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember | 605aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Impaired Financing Receivable, Trouble Debt Structuring, Total | 618aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember | 605aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Commercial Real Estate Owner Occupied Loans [Member] |  |
Financing Receivable Trouble Debt Restructuring Accrual Status [Line Items] |  |
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing | 836aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember | 846aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual | 251aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember | 263aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Impaired Financing Receivable, Trouble Debt Structuring, Total | 1,087aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember | 1,109aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses | 92aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember | 102aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Commercial Real Estate Other Loans [Member] |  |
Financing Receivable Trouble Debt Restructuring Accrual Status [Line Items] |  |
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing | 592aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember | 591aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember
Impaired Financing Receivable, Trouble Debt Structuring, Total | 592aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember | 591aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses | 92aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember | 92aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateOtherLoansMember
Commercial Real Estate Loans, Total [Member] |  |
Financing Receivable Trouble Debt Restructuring Accrual Status [Line Items] |  |
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing | 1,428aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember | 1,437aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual | 251aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember | 263aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember
Impaired Financing Receivable, Trouble Debt Structuring, Total | 1,679aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember | 1,700aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses | 184aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember | 194aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_CommercialRealEstateLoansTotalMember
Residential Real Estate Consumer Mortgage Loans [Member] |  |
Financing Receivable Trouble Debt Restructuring Accrual Status [Line Items] |  |
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing | 759aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember | 742aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember
Impaired Financing Receivable, Trouble Debt Structuring, Total | 759aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember | 742aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember
Residential Real Estate Investment Property Loans [Member] |  |
Financing Receivable Trouble Debt Restructuring Accrual Status [Line Items] |  |
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual | 150aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember | 154aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember
Impaired Financing Receivable, Trouble Debt Structuring, Total | 150aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember | 154aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember
Residential Real Estate Loans, Total [Member] |  |
Financing Receivable Trouble Debt Restructuring Accrual Status [Line Items] |  |
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing | 759aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateLoansTotalMember | 742aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateLoansTotalMember
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual | 150aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateLoansTotalMember | 154aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateLoansTotalMember
Impaired Financing Receivable, Trouble Debt Structuring, Total | 909aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateLoansTotalMember | 896aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateLoansTotalMember
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateLoansTotalMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ResidentialRealEstateLoansTotalMember
Consumer Installment and Revolving Loans [Member] |  |
Financing Receivable Trouble Debt Restructuring Accrual Status [Line Items] |  |
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringStillAccruing / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember | 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember
Impaired Financing Receivable, Trouble Debt Structuring, Total | 0aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember | 0aubn_ImpairedFinancingReceivableTroubleDebtStructuring / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses | $ 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember | $ 0aubn_ImpairedFinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = aubn_ConsumerInstallmentAndRevolvingLoansMember

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