Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2020
Summary of Signficant Accounting Policies
Nature of Business Policy	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 Presentation Policy	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, 2019.
Consolidation Policy	The unaudited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Significant intercompany transactions and accounts are eliminated in consolidation.
Use of Estimates Policy	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 (“OREO”).
Reclassification Policy	Reclassifications Certain amounts reported in the prior period have been reclassified to conform to the current-period presentation. These reclassifications had no impact on the Company’s previously reported net earnings or total stockholders’ equity.
Revenue Recognition Policy	Revenue Recognition On January 1, 2018, the Company implemented Accounting Standards Update (“ASU” or “updates”) 2014-09, Revenue from Contracts with Customers, codified at Accounting Standards Codification (“ASC”) 606. The Company adopted ASC 606 using the modified retrospective transition method. The majority of the Company’s revenue stream is generated from interest income on loans and deposits which are outside the scope of ASC 606. The Company’s sources of income that fall within the scope of ASC 606 include service charges on deposits, investment services, interchange fees and gains and losses on sales of other real estate, all of which are presented as components of noninterest income. The following is a summary of the revenue streams that fall within the scope of ASC 606:  Service charges on deposits, investment services, ATM and interchange fees – Fees from these services are either transaction-based, for which the performance obligations are satisfied when the individual transaction is processed, or set periodic service charges, for which the performance obligations are satisfied over the period the service is provided. Transaction-based fees are recognized at the time the transaction is processed, and periodic service charges are recognized over the service period.  Gains on sales of OREO – A gain on sale should be recognized when a contract for sale exists and control of the asset has been transferred to the buyer. ASC 606 lists several criteria required to conclude that a contract for sale exists, including a determination that the institution will collect substantially all of the consideration to which it is entitled. In addition to the loan-to-value, the analysis is based on various other factors, including the credit quality of the borrower, the structure of the loan, and any other factors that may affect collectability.
Subsequent Events Policy	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, 2020. The Company does not believe there were any material subsequent events during this period that would have required further recognition or disclosure in the unaudited consolidated financial statements included in this report.
Accounting Developments	Accounting Developments In the first nine months of 2020, the Company adopted new guidance related to the following ASUs:  ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement; and  ASU 2018-15, Intangibles – Goodwill and Other – Internal Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract. Information about these pronouncements is described in more detail below. ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement, improves the disclosure requirements on fair value measurements by eliminating the requirements to disclose (i) the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; (ii) the policy for timing of transfers between levels; and (iii) the valuation processes for Level 3 fair value measurements. This ASU also added specific disclosure requirements for fair value measurements for public entities including the requirement to disclose the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The amendments in this ASU are effective for all entities for fiscal years beginning after December 15, 2019, and all interim periods within those fiscal years. Early adoption was permitted upon issuance of the ASU. Entities are permitted to early adopt amendments that remove or modify disclosures and delay the adoption of the additional disclosures until their effective date. The Company adopted this ASU on January 1, 2020. Adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. ASU 2018- 15, Intangibles – Goodwill and Other – Internal Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include internal-use software license). This ASU requires entities to use the guidance in FASB ASC 350-40, Intangibles - Goodwill and Other - Internal Use Software, to determine whether to capitalize or expense implementation costs related to the service contract. This ASU also requires entities to (i) expense capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement; (ii) present the expense related to the capitalized implementation costs in the same line item on the income statement as fees associated with the hosting element of the arrangement; (iii) classify payments for capitalized implementation costs in the statement of cash flows in the same manner as payments made for fees associated with the hosting element; and (iv) present the capitalized implementation costs in the same balance sheet line item that a prepayment for the fees associated with the hosting arrangement would be presented. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption was permitted. The Company adopted this ASU on January 1, 2020. Adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2020

Summary of Signficant Accounting Policies

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 Presentation Policy

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, 2019.

Consolidation Policy

The unaudited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Significant intercompany transactions and accounts are eliminated in consolidation.

Use of Estimates Policy

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 (“OREO”).

Reclassification Policy

Reclassifications

Certain amounts reported in the prior period have been reclassified to conform to the current-period presentation. These reclassifications had no impact on the Company’s previously reported net earnings or total stockholders’ equity.

Revenue Recognition Policy

Revenue Recognition

On January 1, 2018, the Company implemented Accounting Standards Update (“ASU” or “updates”) 2014-09, Revenue from Contracts with Customers, codified at Accounting Standards Codification (“ASC”) 606. The Company adopted ASC 606 using the modified retrospective transition method. The majority of the Company’s revenue stream is generated from interest income on loans and deposits which are outside the scope of ASC 606.

The Company’s sources of income that fall within the scope of ASC 606 include service charges on deposits, investment services, interchange fees and gains and losses on sales of other real estate, all of which are presented as components of noninterest income. The following is a summary of the revenue streams that fall within the scope of ASC 606:

 Service charges on deposits, investment services, ATM and interchange fees – Fees from these services are either transaction-based, for which the performance obligations are satisfied when the individual transaction is processed, or set periodic service charges, for which the performance obligations are satisfied over the period the service is provided. Transaction-based fees are recognized at the time the transaction is processed, and periodic service charges are recognized over the service period.

 Gains on sales of OREO – A gain on sale should be recognized when a contract for sale exists and control of the asset has been transferred to the buyer. ASC 606 lists several criteria required to conclude that a contract for sale exists, including a determination that the institution will collect substantially all of the consideration to which it is entitled. In addition to the loan-to-value, the analysis is based on various other factors, including the credit quality of the borrower, the structure of the loan, and any other factors that may affect collectability.

Subsequent Events Policy

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, 2020. The Company does not believe there were any material subsequent events during this period that would have required further recognition or disclosure in the unaudited consolidated financial statements included in this report.

Accounting Developments

In the first nine months of 2020, the Company adopted new guidance related to the following ASUs:

 ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement; and

 ASU 2018-15, Intangibles – Goodwill and Other – Internal Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract.

Information about these pronouncements is described in more detail below.

ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement, improves the disclosure requirements on fair value measurements by eliminating the requirements to disclose (i) the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; (ii) the policy for timing of transfers between levels; and (iii) the valuation processes for Level 3 fair value measurements. This ASU also added specific disclosure requirements for fair value measurements for public entities including the requirement to disclose the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements.

The amendments in this ASU are effective for all entities for fiscal years beginning after December 15, 2019, and all interim periods within those fiscal years. Early adoption was permitted upon issuance of the ASU. Entities are permitted to early adopt amendments that remove or modify disclosures and delay the adoption of the additional disclosures until their effective date. The Company adopted this ASU on January 1, 2020. Adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

ASU 2018- 15, Intangibles – Goodwill and Other – Internal Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include internal-use software license). This ASU requires entities to use the guidance in FASB ASC 350-40, Intangibles - Goodwill and Other - Internal Use Software, to determine whether to capitalize or expense implementation costs related to the service contract. This ASU also requires entities to (i) expense capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement; (ii) present the expense related to the capitalized implementation costs in the same line item on the income statement as fees associated with the hosting element of the arrangement; (iii) classify payments for capitalized implementation costs in the statement of cash flows in the same manner as payments made for fees associated with the hosting element; and (iv) present the capitalized implementation costs in the same balance sheet line item that a prepayment for the fees associated with the hosting arrangement would be presented.

The amendments in this ASU are effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption was permitted. The Company adopted this ASU on January 1, 2020. Adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.