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Fair Value Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Financial Assets: [Abstract]    
Fair Value, Financial Instruments, Loans, Net $ 391,891aubn_FairValueFinancialInstrumentsLoansNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
$ 398,118aubn_FairValueFinancialInstrumentsLoansNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value, Financial Instruments, Loans Held For Sale 3,549aubn_FairValueFinancialInstrumentsLoansHeldForSale
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
1,974aubn_FairValueFinancialInstrumentsLoansHeldForSale
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value, Financial Liabilities: [Abstract]    
Fair Value, Financial Instruments, Time Deposits 238,670aubn_FairValueFinancialInstrumentsTimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
249,126aubn_FairValueFinancialInstrumentsTimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value, Financial Instruments, Long-term Debt 7,217aubn_FairValueFinancialInstrumentsLongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
12,217aubn_FairValueFinancialInstrumentsLongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Financial Assets: [Abstract]    
Fair Value, Financial Instruments, Loans, Net 401,679aubn_FairValueFinancialInstrumentsLoansNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
407,839aubn_FairValueFinancialInstrumentsLoansNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Financial Instruments, Loans Held For Sale 3,647aubn_FairValueFinancialInstrumentsLoansHeldForSale
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
2,044aubn_FairValueFinancialInstrumentsLoansHeldForSale
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Financial Liabilities: [Abstract]    
Fair Value, Financial Instruments, Time Deposits 241,216aubn_FairValueFinancialInstrumentsTimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
251,365aubn_FairValueFinancialInstrumentsTimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Financial Instruments, Long-term Debt 7,217aubn_FairValueFinancialInstrumentsLongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
12,558aubn_FairValueFinancialInstrumentsLongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Financial Assets: [Abstract]    
Fair Value, Financial Instruments, Loans, Net 0aubn_FairValueFinancialInstrumentsLoansNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0aubn_FairValueFinancialInstrumentsLoansNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Financial Instruments, Loans Held For Sale 0aubn_FairValueFinancialInstrumentsLoansHeldForSale
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0aubn_FairValueFinancialInstrumentsLoansHeldForSale
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Financial Liabilities: [Abstract]    
Fair Value, Financial Instruments, Time Deposits 0aubn_FairValueFinancialInstrumentsTimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0aubn_FairValueFinancialInstrumentsTimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Financial Instruments, Long-term Debt 0aubn_FairValueFinancialInstrumentsLongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0aubn_FairValueFinancialInstrumentsLongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Financial Assets: [Abstract]    
Fair Value, Financial Instruments, Loans, Net 0aubn_FairValueFinancialInstrumentsLoansNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0aubn_FairValueFinancialInstrumentsLoansNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Financial Instruments, Loans Held For Sale 3,647aubn_FairValueFinancialInstrumentsLoansHeldForSale
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
2,044aubn_FairValueFinancialInstrumentsLoansHeldForSale
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Financial Liabilities: [Abstract]    
Fair Value, Financial Instruments, Time Deposits 241,216aubn_FairValueFinancialInstrumentsTimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
251,365aubn_FairValueFinancialInstrumentsTimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Financial Instruments, Long-term Debt 7,217aubn_FairValueFinancialInstrumentsLongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
12,558aubn_FairValueFinancialInstrumentsLongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Financial Assets: [Abstract]    
Fair Value, Financial Instruments, Loans, Net 401,679aubn_FairValueFinancialInstrumentsLoansNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
407,839aubn_FairValueFinancialInstrumentsLoansNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Financial Instruments, Loans Held For Sale 0aubn_FairValueFinancialInstrumentsLoansHeldForSale
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0aubn_FairValueFinancialInstrumentsLoansHeldForSale
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Financial Liabilities: [Abstract]    
Fair Value, Financial Instruments, Time Deposits 0aubn_FairValueFinancialInstrumentsTimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0aubn_FairValueFinancialInstrumentsTimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Financial Instruments, Long-term Debt $ 0aubn_FairValueFinancialInstrumentsLongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 0aubn_FairValueFinancialInstrumentsLongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member