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Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	$ 4,098us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	$ 4,337us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(2,259)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied	(2,503)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,839us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	1,834us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,428us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	1,437us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0aubn_ImpairedFinancingReceivableWithRelatedAllowanceChargeOffAndPaymentsApplied	0aubn_ImpairedFinancingReceivableWithRelatedAllowanceChargeOffAndPaymentsApplied
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,428us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	1,437us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Impaired Financing Receivable, With Related Allowance, Related Allowance	184aubn_ImpairedFinancingReceivableWithRelatedAllowanceRelatedAllowance	194aubn_ImpairedFinancingReceivableWithRelatedAllowanceRelatedAllowance
Impaired Financing Receivable, Unpaid Principal Balance	5,526us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance	5,774us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Impaired Financing Receivable, Charge-off And Payments Applied	(2,259)aubn_ImpairedFinancingReceivableChargeOffAndPaymentsApplied	(2,503)aubn_ImpairedFinancingReceivableChargeOffAndPaymentsApplied
Impaired Financing Receivable, Recorded Investment	3,267us-gaap_ImpairedFinancingReceivableRecordedInvestment	3,271us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired Financing Receivable, Related Allowance	184us-gaap_ImpairedFinancingReceivableRelatedAllowance	194us-gaap_ImpairedFinancingReceivableRelatedAllowance
Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	61us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember	70us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	0aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember	0aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	61us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember	70us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialAndIndustrialLoansMember
Construction And Land Development Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,609us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember	2,822us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(1,991)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember	(2,217)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	618us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember	605us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ConstructionAndLandDevelopmentLoansMember
Commercial Real Estate Owner Occupied Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	321us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember	331us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(70)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember	(68)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	251us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember	263us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	836us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember	846us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0aubn_ImpairedFinancingReceivableWithRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember	0aubn_ImpairedFinancingReceivableWithRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Impaired Financing Receivable, with Related Allowance, Recorded Investment	836us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember	846us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Impaired Financing Receivable, With Related Allowance, Related Allowance	92aubn_ImpairedFinancingReceivableWithRelatedAllowanceRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember	102aubn_ImpairedFinancingReceivableWithRelatedAllowanceRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOwnerOccupiedLoansMember
Commercial Real Estate Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	592us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOtherLoansMember	591us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOtherLoansMember
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0aubn_ImpairedFinancingReceivableWithRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOtherLoansMember	0aubn_ImpairedFinancingReceivableWithRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOtherLoansMember
Impaired Financing Receivable, with Related Allowance, Recorded Investment	592us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOtherLoansMember	591us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOtherLoansMember
Impaired Financing Receivable, With Related Allowance, Related Allowance	92aubn_ImpairedFinancingReceivableWithRelatedAllowanceRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOtherLoansMember	92aubn_ImpairedFinancingReceivableWithRelatedAllowanceRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateOtherLoansMember
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	321us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember	331us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(70)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember	(68)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	251us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember	263us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,428us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember	1,437us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied	0aubn_ImpairedFinancingReceivableWithRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember	0aubn_ImpairedFinancingReceivableWithRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,428us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember	1,437us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Impaired Financing Receivable, With Related Allowance, Related Allowance	184aubn_ImpairedFinancingReceivableWithRelatedAllowanceRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember	194aubn_ImpairedFinancingReceivableWithRelatedAllowanceRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_CommercialRealEstateLoansTotalMember
Residential Real Estate Consumer Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	928us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember	934us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(169)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember	(192)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	759us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember	742us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateConsumerMortgageLoansMember
Residential Real Estate Investment Property Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	179us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember	180us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(29)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember	(26)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	150us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember	154us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateInvestmentPropertyLoansMember
Residential Real Estate Loans, Total [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,107us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember	1,114us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied	(198)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember	(218)aubn_ImpairedFinancingReceivableWithNoRelatedAllowanceChargeOffAndPaymentsApplied / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 909us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember	$ 896us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = aubn_ResidentialRealEstateLoansTotalMember

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