Consolidated Statements of Earnings (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Interest income:
Loans, including fees	$ 5,006	$ 4,790
Securities - Taxable	1,040us-gaap_InterestIncomeSecuritiesTaxable	1,176us-gaap_InterestIncomeSecuritiesTaxable
Securities - Tax-exempt	651	627
Federal funds sold and interest bearing bank deposits	39us-gaap_OtherInterestAndDividendIncome	42us-gaap_OtherInterestAndDividendIncome
Total interest income	6,736	6,635
Interest expense:
Deposits	1,102us-gaap_InterestExpenseDeposits	1,257us-gaap_InterestExpenseDeposits
Short-term borrowings	6	4
Long-term debt interest expense	105	104
Total interest expense	1,213us-gaap_InterestExpense	1,365us-gaap_InterestExpense
Net interest income	5,523us-gaap_InterestIncomeExpenseNet	5,270us-gaap_InterestIncomeExpenseNet
Provision for loan losses	0	(400)
Net interest income after provision for loan losses	5,523	5,670
Noninterest income:
Service charges on deposit accounts	206	213
Mortgage lending	334us-gaap_GainLossOnSalesOfLoansNet	386us-gaap_GainLossOnSalesOfLoansNet
Bank-owned life insurance income	401us-gaap_BankOwnedLifeInsuranceIncome	126us-gaap_BankOwnedLifeInsuranceIncome
Other noninterest income	377us-gaap_NoninterestIncomeOther	338us-gaap_NoninterestIncomeOther
Securities gain (losses), net:
Realized gains, net	3us-gaap_GainLossOnSaleOfSecuritiesNet	26us-gaap_GainLossOnSaleOfSecuritiesNet
Total other-than-temporary impairments	0	(333)
Total securities gains (losses), net	3aubn_TotalSecurityGainsOrLossesNet	(307)aubn_TotalSecurityGainsOrLossesNet
Total noninterest income	1,321us-gaap_NoninterestIncome	756us-gaap_NoninterestIncome
Noninterest expense:
Salaries and benefits	2,268us-gaap_LaborAndRelatedExpense	2,281us-gaap_LaborAndRelatedExpense
Net occupancy and equipment	358us-gaap_OccupancyNet	352us-gaap_OccupancyNet
Professional fees	201us-gaap_ProfessionalFees	206us-gaap_ProfessionalFees
FDIC and other regulatory assessments	125aubn_FdicAndOtherRegulatoryAssessments	145aubn_FdicAndOtherRegulatoryAssessments
Other real estate owned, net	17us-gaap_ForeclosedRealEstateExpense	118us-gaap_ForeclosedRealEstateExpense
Prepayment penalties on long-term debt	362	0
Other noninterest expense	983us-gaap_OtherNoninterestExpense	846us-gaap_OtherNoninterestExpense
Total noninterest expense	4,314us-gaap_NoninterestExpense	3,948us-gaap_NoninterestExpense
Earnings before income taxes	2,530	2,478
Income tax expense	668us-gaap_IncomeTaxExpenseBenefit	657us-gaap_IncomeTaxExpenseBenefit
Net earnings	$ 1,862us-gaap_ProfitLoss	$ 1,821us-gaap_ProfitLoss
Net earnings per share:
Basic and diluted earnings per share	$ 0.51us-gaap_EarningsPerShareBasicAndDiluted	$ 0.5us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding:
Basic and diluted weighted average shares outstanding	3,643,365	3,643,161

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