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Auburn National Bancorporation - Parent Only, Statement of Earnings (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income: |  |  |
Other noninterest income | $ 1,454 us-gaap_NoninterestIncomeOther | $ 1,377 us-gaap_NoninterestIncomeOther | $ 1,535 us-gaap_NoninterestIncomeOther
Other Expenses [Abstract] |  |  |
Total interest expense | 5,364 us-gaap_InterestExpense | 6,536 us-gaap_InterestExpense | 8,170 us-gaap_InterestExpense
Total noninterest expense | 15,104 us-gaap_NoninterestExpense | 18,412 us-gaap_NoninterestExpense | 19,383 us-gaap_NoninterestExpense
Income Tax Expense (Benefit) | 2,784 us-gaap_IncomeTaxExpenseBenefit | 2,290 us-gaap_IncomeTaxExpenseBenefit | 1,419 us-gaap_IncomeTaxExpenseBenefit
Net earnings | 7,448 us-gaap_ProfitLoss | 7,118 us-gaap_ProfitLoss | 6,763 us-gaap_ProfitLoss
Parent Company [Member] |  |  |
Income: |  |  |
Dividends from bank subsidiary | 3,377 aubn_DividendsReceivedFromBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,304 aubn_DividendsReceivedFromBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,231 aubn_DividendsReceivedFromBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other noninterest income | 147 us-gaap_NoninterestIncomeOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,284 us-gaap_NoninterestIncomeOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 288 us-gaap_NoninterestIncomeOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total income | 3,524 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,588 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,519 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Expenses [Abstract] |  |  |
Total interest expense | 236 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 236 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 236 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total noninterest expense | 206 us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 302 us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 318 us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Expenses, Total | 442 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 538 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 554 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Earnings Before Income Tax Expense (Benefit) And Equity In Undistributed Earnings Of Bank Subsidary | 3,082 aubn_EarningsBeforeIncomeTaxBenefitExpenseAndEquityInUndistributedEarningsOfBankSubsidary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,050 aubn_EarningsBeforeIncomeTaxBenefitExpenseAndEquityInUndistributedEarningsOfBankSubsidary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,965 aubn_EarningsBeforeIncomeTaxBenefitExpenseAndEquityInUndistributedEarningsOfBankSubsidary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Tax Expense (Benefit) | (114)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 275 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (45)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Earnings Before Equity In Undistributed Earnings Of Bank Subsidary | 3,196 aubn_EarningsBeforeEquityInUndistributedEarningsOfBankSubsidary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,775 aubn_EarningsBeforeEquityInUndistributedEarningsOfBankSubsidary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,010 aubn_EarningsBeforeEquityInUndistributedEarningsOfBankSubsidary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity In Undistributed Earnings Of Bank Subsidary | 4,252 aubn_EquityInUndistributedDistributedEarningsOfBankSubsidary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,343 aubn_EquityInUndistributedDistributedEarningsOfBankSubsidary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,753 aubn_EquityInUndistributedDistributedEarningsOfBankSubsidary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net earnings | $ 7,448 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 7,118 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 6,763 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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