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Troubled Debt Restructuring Accrual Status (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
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