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Summary of Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2013
Summary of Signficant Accounting Policies |
Nature of Operations [Text Block] | General Auburn National Bancorporation, Inc. (the “Company”) provides a full range of banking services to individual and corporate customers in Lee County, Alabama and surrounding counties through its wholly owned subsidiary, AuburnBank (the “Bank”). The Company does not have any segments other than banking that are considered material.
Basis of Accounting [Text Block] | Basis of Presentation and Use of Estimates The unaudited consolidated financial statements in this report have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information. Accordingly, these financial statements do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The unaudited consolidated financial statements include, in the opinion of management, all adjustments necessary to present a fair statement of the financial position and the results of operations for all periods presented. All such adjustments are of a normal recurring nature. The results of operations in the interim statements are not necessarily indicative of the results of operations that the Company and its subsidiaries may achieve for future interim periods or the entire year. For further information, refer to the consolidated financial statements and footnotes included in the Company's annual report on Form 10-K for the year ended December 31, 2012.
Consolidation Policy [TextBlock] | The unaudited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Auburn National Bancorporation Capital Trust I is an affiliate of the Company and was included in these unaudited consolidated financial statements pursuant to the equity method of accounting. Significant intercompany transactions and accounts are eliminated in consolidation.
Use of Estimates, Policy [Policy Text Block] | The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the balance sheet date and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term include other-than-temporary impairment on investment securities, the determination of the allowance for loan losses, fair value of financial instruments, and the valuation of deferred tax assets and other real estate owned.
Subsequent Events, Policy [Policy Text Block] | Subsequent Events The Company has evaluated the effects of events and transactions through the date of this filing that have occurred subsequent to September 30, 2013. The Company does not believe there were any material subsequent events during this period that would have required recognition or disclosure in the unaudited consolidated financial statements included in this report.
New Accounting Pronouncements Policy [Policy Text Block] | Accounting Developments In the first quarter of 2013, the Company adopted new guidance related to the following Accounting Standards Updates (“Updates” or “ASUs”): ASU 2011-11, Disclosures about Offsetting Assets and Liabilities; ASU 2013-01, Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities; and ASU 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. In the third quarter of 2013, the Company adopted new guidance related to the following Update: ASU 2013-10, Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes. Information about these pronouncements is described in more detail below. ASU 2011-11, Disclosures about Offsetting Assets and Liabilities, expands the disclosure requirements for financial instruments and derivatives that may be offset in accordance with enforceable master netting agreements or similar arrangements. The disclosures are required regardless of whether the instruments have been offset (or netted) in the statement of financial position. Under ASU 2011-11, companies must describe the nature of offsetting arrangements and provide quantitative information about those agreements, including the gross and net amounts of financial instruments that are recognized in the statement of financial position. In January 2013, the FASB issued ASU 2013-01, Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities, which clarifies the scope of the offsetting disclosures and addresses any unintended consequences due to feedback from stakeholders that standard commercial provisions of many contracts would equate to a master netting arrangement. These changes were effective for the Company in the first quarter of 2013 with retrospective application. Adoption of this ASU did not have a significant impact on the financial statements of the Company. ASU 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income, seeks to improve the reporting of reclassifications out of accumulated other comprehensive income. The amendments in this Update will require an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. GAAP to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. These changes were effective for the Company in the first quarter of 2013 with retrospective application. This Update did not affect our consolidated financial results as it amends only the presentation of comprehensive income. See Consolidated Statements of Comprehensive Income. ASU 2013-10, Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes, permits the Fed Funds Effective Swap Rate (Overnight Index Swap Rate) to be used as a U.S. benchmark interest rate for hedge accounting purposes, in addition to LIBOR and U.S. Treasury. The ASU also removes the restriction on using different benchmark rates for similar hedges. These changes are effective for the Company in the third quarter of 2013 with prospective application for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. Adoption of this ASU did not have a significant impact on the financial statements of the Company.

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- Definition Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. 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