Consolidated Statements of Earnings (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income:
Loans, including fees	$ 19,551	$ 20,604	$ 21,943
Securities - Taxable	4,627us-gaap_InterestIncomeSecuritiesTaxable	3,912us-gaap_InterestIncomeSecuritiesTaxable	3,883us-gaap_InterestIncomeSecuritiesTaxable
Securities - Tax-exempt	2,502	2,794	3,187
Federal funds sold and interest bearing bank deposits	137us-gaap_OtherInterestAndDividendIncome	148us-gaap_OtherInterestAndDividendIncome	54us-gaap_OtherInterestAndDividendIncome
Total interest income	26,817	27,458	29,067
Interest expense:
Deposits	4,927us-gaap_InterestExpenseDeposits	5,392us-gaap_InterestExpenseDeposits	6,324us-gaap_InterestExpenseDeposits
Short-term borrowings	19	14	16
Long-term debt interest expense	418	1,130	1,830
Total interest expense	5,364us-gaap_InterestExpense	6,536us-gaap_InterestExpense	8,170us-gaap_InterestExpense
Net interest income	21,453us-gaap_InterestIncomeExpenseNet	20,922us-gaap_InterestIncomeExpenseNet	20,897us-gaap_InterestIncomeExpenseNet
Provision for loan losses	50	400	3,815
Net interest income after provision for loan losses	21,403	20,522	17,082
Noninterest income:
Service charges on deposit accounts	872	930	1,111
Mortgage lending	1,636us-gaap_GainLossOnSalesOfLoansNet	2,895us-gaap_GainLossOnSalesOfLoansNet	3,445us-gaap_GainLossOnSalesOfLoansNet
Bank-owned life insurance gain	501us-gaap_BankOwnedLifeInsuranceIncome	427us-gaap_BankOwnedLifeInsuranceIncome	445us-gaap_BankOwnedLifeInsuranceIncome
Gain on sale of affordable housing investments	0	0	3,268
Gain on sale of premises and equipment	0	1,018	0
Other noninterest income	1,454us-gaap_NoninterestIncomeOther	1,377us-gaap_NoninterestIncomeOther	1,535us-gaap_NoninterestIncomeOther
Securities (losses) gains, net:
Realized (losses) gains, net	(197)us-gaap_GainLossOnSaleOfSecuritiesNet	651us-gaap_GainLossOnSaleOfSecuritiesNet	809us-gaap_GainLossOnSaleOfSecuritiesNet
Total other-than-temporary impairments	(333)	0	(130)
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income	0	0	0
Total securities (losses) gains, net	(530)aubn_TotalSecurityGainsOrLossesNet	651aubn_TotalSecurityGainsOrLossesNet	679aubn_TotalSecurityGainsOrLossesNet
Total noninterest income	3,933us-gaap_NoninterestIncome	7,298us-gaap_NoninterestIncome	10,483us-gaap_NoninterestIncome
Noninterest expense:
Salaries and benefits	8,943us-gaap_LaborAndRelatedExpense	8,788us-gaap_LaborAndRelatedExpense	8,691us-gaap_LaborAndRelatedExpense
Net occupancy and equipment	1,431us-gaap_OccupancyNet	1,335us-gaap_OccupancyNet	1,332us-gaap_OccupancyNet
Professional fees	920us-gaap_ProfessionalFees	774us-gaap_ProfessionalFees	704us-gaap_ProfessionalFees
FDIC and other regulatory assessments	465aubn_FdicAndOtherRegulatoryAssessments	512aubn_FdicAndOtherRegulatoryAssessments	686aubn_FdicAndOtherRegulatoryAssessments
Other real estate owned, net	(450)us-gaap_ForeclosedRealEstateExpense	570us-gaap_ForeclosedRealEstateExpense	323us-gaap_ForeclosedRealEstateExpense
Prepayment penalties on long-term debt	0	3,028	3,720
Other noninterest expense	3,795us-gaap_OtherNoninterestExpense	3,405us-gaap_OtherNoninterestExpense	3,927us-gaap_OtherNoninterestExpense
Total noninterest expense	15,104us-gaap_NoninterestExpense	18,412us-gaap_NoninterestExpense	19,383us-gaap_NoninterestExpense
Earnings before income taxes	10,232	9,408	8,182
Income tax expense	2,784us-gaap_IncomeTaxExpenseBenefit	2,290us-gaap_IncomeTaxExpenseBenefit	1,419us-gaap_IncomeTaxExpenseBenefit
Net earnings	$ 7,448us-gaap_ProfitLoss	$ 7,118us-gaap_ProfitLoss	$ 6,763us-gaap_ProfitLoss
Net earnings per share:
Basic and diluted earnings per share	$ 2.04us-gaap_EarningsPerShareBasicAndDiluted	$ 1.95us-gaap_EarningsPerShareBasicAndDiluted	$ 1.86us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding:
Basic and diluted weighted average shares outstanding	3,643,278	3,643,003	3,642,831

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