SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
Sep. 30, 2024
Accounting Policies [Abstract]
Organization	Organization The Corporation, through its wholly-owned subsidiaries, the Bank and CFS, provides a wide range of banking, financing, fiduciary, and other financial services to its clients. The Corporation and the Bank are subject to the regulations of certain federal and state agencies and undergo periodic examinations by those regulatory authorities. Chemung Risk Management, Inc., (CRM), a wholly-owned subsidiary of the Corporation, was a Nevada-based captive insurance company which insured against certain risks unique to the operations of the Corporation and its subsidiaries and for which insurance may not have been currently available or economically feasible in today's insurance marketplace. CRM was dissolved by the Corporation, effective December 6, 2023.
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in conformity with GAAP for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 8 of Regulation S-X of the Exchange Act. These financial statements include the accounts of the Corporation and its subsidiaries, and all significant intercompany balances and transactions are eliminated in consolidation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and disclosures provided, and actual results could differ. In the opinion of management, all adjustments (consisting of normal recurring adjustments) and disclosures necessary for the fair presentation of the accompanying consolidated financial statements have been included. The unaudited consolidated financial statements should be read in conjunction with the Corporation's 2023 Annual Report on Form 10-K for the year ended December 31, 2023. The results of operations for any interim periods are not necessarily indicative of the results which may be expected for the entire year or any other period.
Reclassifications	Reclassifications Amounts in the prior year financial statements are reclassified whenever necessary to conform to the current year's presentation.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In March 2024, the U.S. Securities and Exchange Commission ("SEC") issued SEC Release No. 33-11275, adopting its final rule “The Enhancement and Standardization of Climate-Related Disclosures for Investors.” This rule will require registrants to disclose limited climate-related information in registration statements and annual reports. In April 2024, the SEC voluntarily stayed the implementation of its final rule, and was pending judicial review as of September 30, 2024. As a smaller reporting company, these disclosure requirements, once issued in the final rule, would apply to the Corporation's filings for the fiscal year beginning January 1, 2027. Accounting Standards Pending Adoption In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, enhancing disclosure requirements for reportable segments, focusing on significant segment expenses, the identification of a segment's chief decision making officer, and the metrics used by the chief decision making officer in evaluating segment-level operating performance. The ASU is effective for fiscal years beginning after December 15, 2023. The Corporation will begin providing enhanced segment reporting disclosures in accordance with ASU 2023-07 for the fiscal year ending December 31, 2024, and for interim periods thereafter. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which will require public business entities to disclose annually a tabular rate reconciliation, including specific items such as state and local income tax, tax credits, nontaxable or nondeductible items, among others, and a separate disclosure requiring disaggregation of reconciling items as described above which equal or exceed 5% percent of the product of multiplying income from continuing operations by the applicable statutory income tax rate. The ASU is effective for all public business entities for annual periods beginning after December 31, 2024. Use of Analogous Accounting Standards Under U.S. GAAP, there is no specific guidance related to government assistance received by a for-profit entity that is not in the form of a loan, income tax credit, or revenue from a contract with a customer. Therefore, the Corporation must rely upon analogous accounting standards to determine appropriate treatment when such circumstances arise. During 2023, the Corporation accounted for the recognition of the Employee Retention Tax Credit (ERTC) using ASC 958-605, Revenue Recognition for Not-for-Profit entities. ASC 958-10-15-1 specifies that certain Subtopics within ASC 958-605 also apply to business entities. In November 2023, the FASB added a project relating to receipt of government grants by business entities to its technical agenda, and in April 2024 announced that it will pursue an approach modeled on International Accounting Standards (IAS) 20 - Accounting for Government Grants and Disclosure of Government Assistance. The ERTC is within the scope of this project. The Corporation considers the recognition of the ERTC to be analogous to the stipulations for "conditional contributions" under ASC 958-605-20. Conditional contributions have at least one barrier needing to be overcome before the recipient is entitled to the assets transferred or promised; there must be a right-of-return to the contributor; and barriers to the condition should be measurable. The Corporation recognized the gross amount of the ERTC through non-interest income during the period in which the barrier was overcome, identified as the period during which amended tax returns were filed. The Corporation incurred and recognized additional income tax expense during 2023 in relation to its amended tax returns.
Earnings Per Common Share	Basic earnings per share is net income divided by the weighted average number of common shares outstanding during the period. Issuable shares, including those related to directors’ restricted stock shares, are considered outstanding and are included in the computation of basic earnings per share. All outstanding unvested share-based payment awards that contain rights to non-forfeitable dividends are considered participating securities for this calculation. Restricted stock awards are grants of participating securities and are considered outstanding at grant date. Earnings per share information is adjusted to present comparative results for stock splits and stock dividends that occur.
Fair Value Measurement	Fair value is the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair value: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a reporting entity's own assumptions about the assumptions market participants would use in pricing an asset or liability. The Corporation used the following methods and significant assumptions to estimate fair value: Available for Sale Securities: The fair value of securities available for sale are usually determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1 inputs), or matrix pricing, which is a mathematical technique widely used to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities (Level 2 inputs). For securities where quoted prices or market prices of similar securities are not available, fair value is calculated using discounted cash flows or other market indicators (Level 3 inputs). Equity Investments: Securities that are held to fund a deferred compensation plan and securities that have a readily determinable fair market value are recorded at fair value with changes in fair value included in earnings. The fair value of equity investments are determined by quoted market prices (Level 1 inputs). Individually Analyzed Loans: At the time a loan is considered individually analyzed, it is valued at the lower of amortized cost or fair value. Individually analyzed loans carried at fair value have been partially charged-off or receive specific allocations as part of the allowance for credit loss accounting. For collateral dependent loans, fair value is commonly based on real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are usually significant and typically result in a Level 3 classification of the inputs for determining fair value. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, typically resulting in Level 3 fair value inputs. Individually analyzed loans are evaluated on a quarterly basis for additional credit loss and adjusted accordingly. OREO: Assets acquired through or in lieu of loan foreclosures are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. Fair value is commonly based on recent real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are usually significant and typically result in a Level 3 classification of the inputs for determining fair value. Appraisals for both collateral dependent loans and OREO are performed by certified general appraisers (commercial properties) or certified residential appraisers (residential properties) whose qualifications and licenses have been reviewed and verified by the Corporation. Once received, appraisals are reviewed for reasonableness of assumptions, approaches utilized, Uniform Standards of Professional Appraisal Practice and other regulatory compliance, as well as the overall resulting fair value in comparison with independent data sources such as recent market data or industry-wide statistics. Appraisals are generally completed within the twelve month period prior to a property being placed into OREO. For individually analyzed loans, appraisal values are adjusted based on the age of the appraisal, the position of the lien, the type of the property, and its condition. Derivatives: The fair value of interest rate swaps are based on valuation models using observable market data as of the measurement date (Level 2 inputs). Derivatives are traded in an over-the-counter market where quoted market prices are not always available. Therefore, the fair value of derivatives are determined using quantitative models that utilize multiple market inputs. The inputs will vary based on the type of derivative, but could include interest rates, prices, and indices to generate continuous yield or pricing curves, prepayment rates, and volatility factors to value the position. The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counter-party's nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Corporation has considered the impact of any applicable credit enhancements, such as collateral postings. Although the Corporation has determined the majority of inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize credit default rate assumptions (Level 3 inputs).
Revenue	A description of the Corporation's revenue streams accounted for under ASC 606 follows: Service Charges on Deposit Accounts: The Corporation earns fees from its deposit customers for transaction-based, account maintenance, and overdraft services. Transaction-based fees, which included services such as ATM use fees, stop payment charges, statement rendering, and ACH fees, are recognized at the time the transaction is executed as that is the point in time the Corporation fulfills the customer's request. Account maintenance fees, which relate primarily to monthly maintenance, are recognized at the time the maintenance occurs. Overdraft fees are recognized at the point in time that the overdraft occurs. Service charges on deposits are withdrawn from the customer's account balance. Interchange Income from Debit Card Transactions: The Corporation earns interchange fees from debit cardholder transactions conducted through the MasterCard payment network. Interchange fees from cardholder transactions represent a percentage of the underlying transaction value and are recognized daily, concurrently with transaction processing services provided to the cardholder. WMG Fee Income (Gross): The Corporation earns wealth management fees from its contracts with customers to manage assets for investment, and/or to conduct transactions on their accounts. These fees are primarily earned over time as the Corporation provides the contracted monthly or quarterly services and are generally assessed based on a tiered scale of the market value of assets under management (AUM) at quarter-end. CFS Fee and Commission Income (Net): The Corporation earns fees from investment brokerage services provided to its customers by a third-party service provider. The Corporation receives commissions from the third-party service provider on a monthly basis based upon customer activity for the month. The Corporation (i) acts as an agent in arranging the relationship between the customer and the third-party service provider and (ii) does not control the services rendered to the customers. Investment brokerage fees are presented net of related costs. The Corporation also earns fees from tax services provided to its customers. Net Gains/Losses on Sales of OREO: The Corporation records a gain or loss from the sale of OREO when control of the property transfers to the buyer, which generally occurs at the time of an executed deed. When the Corporation finances the sale of OREO to the buyer, the Corporation assesses whether the buyer is committed to perform their obligations under the contract and whether collectability of the transaction price is probable. Once these criteria are met, the OREO asset is derecognized and the gain or loss on sale is recorded upon the transfer of control of the property to the buyer. In determining the gain or loss on the sale, the Corporation adjusts the transaction price and related gain (loss) on sale if a significant financing component is present.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2024

The Corporation, through its wholly-owned subsidiaries, the Bank and CFS, provides a wide range of banking, financing, fiduciary, and other financial services to its clients. The Corporation and the Bank are subject to the regulations of certain federal and state agencies and undergo periodic examinations by those regulatory authorities.

Chemung Risk Management, Inc., (CRM), a wholly-owned subsidiary of the Corporation, was a Nevada-based captive insurance company which insured against certain risks unique to the operations of the Corporation and its subsidiaries and for which insurance may not have been currently available or economically feasible in today's insurance marketplace. CRM was dissolved by the Corporation, effective December 6, 2023.

Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared in conformity with GAAP for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 8 of Regulation S-X of the Exchange Act. These financial statements include the accounts of the Corporation and its subsidiaries, and all significant intercompany balances and transactions are eliminated in consolidation.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and disclosures provided, and actual results could differ. In the opinion of management, all adjustments (consisting of normal recurring adjustments) and disclosures necessary for the fair presentation of the accompanying consolidated financial statements have been included. The unaudited consolidated financial statements should be read in conjunction with the Corporation's 2023 Annual Report on Form 10-K for the year ended December 31, 2023. The results of operations for any interim periods are not necessarily indicative of the results which may be expected for the entire year or any other period.

Reclassifications

Amounts in the prior year financial statements are reclassified whenever necessary to conform to the current year's presentation.

Recent Accounting Pronouncements

In March 2024, the U.S. Securities and Exchange Commission ("SEC") issued SEC Release No. 33-11275, adopting its final rule “The Enhancement and Standardization of Climate-Related Disclosures for Investors.” This rule will require registrants to disclose limited climate-related information in registration statements and annual reports. In April 2024, the SEC voluntarily stayed the implementation of its final rule, and was pending judicial review as of September 30, 2024. As a smaller reporting company, these disclosure requirements, once issued in the final rule, would apply to the Corporation's filings for the fiscal year beginning January 1, 2027.

Accounting Standards Pending Adoption

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, enhancing disclosure requirements for reportable segments, focusing on significant segment expenses, the identification of a segment's chief decision making officer, and the metrics used by the chief decision making officer in evaluating segment-level operating performance. The ASU is effective for fiscal years beginning after December 15, 2023. The Corporation will begin providing enhanced segment reporting disclosures in accordance with ASU 2023-07 for the fiscal year ending December 31, 2024, and for interim periods thereafter.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which will require public business entities to disclose annually a tabular rate reconciliation, including specific items such as state and local income tax, tax credits, nontaxable or nondeductible items, among others, and a separate disclosure requiring disaggregation of reconciling items as described above which equal or exceed 5% percent of the product of multiplying income from continuing operations by the applicable statutory income tax rate. The ASU is effective for all public business entities for annual periods beginning after December 31, 2024.

Use of Analogous Accounting Standards

Under U.S. GAAP, there is no specific guidance related to government assistance received by a for-profit entity that is not in the form of a loan, income tax credit, or revenue from a contract with a customer. Therefore, the Corporation must rely upon analogous accounting standards to determine appropriate treatment when such circumstances arise. During 2023, the Corporation accounted for the recognition of the Employee Retention Tax Credit (ERTC) using ASC 958-605, Revenue Recognition for Not-for-Profit entities. ASC 958-10-15-1 specifies that certain Subtopics within ASC 958-605 also apply to business entities. In November 2023, the FASB added a project relating to receipt of government grants by business entities to its technical agenda, and in April 2024 announced that it will pursue an approach modeled on International Accounting Standards (IAS) 20 - Accounting for Government Grants and Disclosure of Government Assistance. The ERTC is within the scope of this project.

The Corporation considers the recognition of the ERTC to be analogous to the stipulations for "conditional contributions" under ASC 958-605-20. Conditional contributions have at least one barrier needing to be overcome before the recipient is entitled to the assets transferred or promised; there must be a right-of-return to the contributor; and barriers to the condition should be measurable. The Corporation recognized the gross amount of the ERTC through non-interest income during the period in which the barrier was overcome, identified as the period during which amended tax returns were filed. The Corporation incurred and recognized additional income tax expense during 2023 in relation to its amended tax returns.

Earnings Per Common Share

Basic earnings per share is net income divided by the weighted average number of common shares outstanding during the period. Issuable shares, including those related to directors’ restricted stock shares, are considered outstanding and are included in the computation of basic earnings per share. All outstanding unvested share-based payment awards that contain rights to non-forfeitable dividends are considered participating securities for this calculation. Restricted stock awards are grants of participating securities and are considered outstanding at grant date. Earnings per share information is adjusted to present comparative results for stock splits and stock dividends that occur.

Fair Value Measurement

Fair value is the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair value:

Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3: Significant unobservable inputs that reflect a reporting entity's own assumptions about the assumptions market participants would use in pricing an asset or liability.

The Corporation used the following methods and significant assumptions to estimate fair value:

Available for Sale Securities: The fair value of securities available for sale are usually determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1 inputs), or matrix pricing, which is a mathematical technique widely used to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities (Level 2 inputs). For securities where quoted prices or market prices of similar securities are not available, fair value is calculated using discounted cash flows or other market indicators (Level 3 inputs).

Equity Investments: Securities that are held to fund a deferred compensation plan and securities that have a readily determinable fair market value are recorded at fair value with changes in fair value included in earnings. The fair value of equity investments are determined by quoted market prices (Level 1 inputs).

Individually Analyzed Loans: At the time a loan is considered individually analyzed, it is valued at the lower of amortized cost or fair value. Individually analyzed loans carried at fair value have been partially charged-off or receive specific allocations as part of the allowance for credit loss accounting. For collateral dependent loans, fair value is commonly based on real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are usually significant and typically result in a Level 3 classification of the inputs for determining fair value. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, typically resulting in Level 3 fair value inputs. Individually analyzed loans are evaluated on a quarterly basis for additional credit loss and adjusted accordingly.

OREO: Assets acquired through or in lieu of loan foreclosures are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. Fair value is commonly based on recent real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are usually significant and typically result in a Level 3 classification of the inputs for determining fair value.

Appraisals for both collateral dependent loans and OREO are performed by certified general appraisers (commercial properties) or certified residential appraisers (residential properties) whose qualifications and licenses have been reviewed and verified by the Corporation. Once received, appraisals are reviewed for reasonableness of assumptions, approaches utilized, Uniform Standards of Professional Appraisal Practice and other regulatory compliance, as well as the overall resulting fair value in comparison with independent data sources such as recent market data or industry-wide statistics. Appraisals are generally completed within the twelve month period prior to a property being placed into OREO. For individually analyzed loans, appraisal values are adjusted based on the age of the appraisal, the position of the lien, the type of the property, and its condition.

Derivatives: The fair value of interest rate swaps are based on valuation models using observable market data as of the measurement date (Level 2 inputs). Derivatives are traded in an over-the-counter market where quoted market prices are not always available. Therefore, the fair value of derivatives are determined using quantitative models that utilize multiple market inputs. The inputs will vary based on the type of derivative, but could include interest rates, prices, and indices to generate continuous yield or pricing curves, prepayment rates, and volatility factors to value the position. The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counter-party's nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Corporation has considered the impact of any applicable credit enhancements, such as collateral postings. Although the Corporation has determined the majority of inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize credit default rate assumptions (Level 3 inputs).

Revenue

A description of the Corporation's revenue streams accounted for under ASC 606 follows:

Service Charges on Deposit Accounts: The Corporation earns fees from its deposit customers for transaction-based, account maintenance, and overdraft services. Transaction-based fees, which included services such as ATM use fees, stop payment charges, statement rendering, and ACH fees, are recognized at the time the transaction is executed as that is the point in time the Corporation fulfills the customer's request. Account maintenance fees, which relate primarily to monthly maintenance, are recognized at the time the maintenance occurs. Overdraft fees are recognized at the point in time that the overdraft occurs. Service charges on deposits are withdrawn from the customer's account balance.

Interchange Income from Debit Card Transactions: The Corporation earns interchange fees from debit cardholder transactions conducted through the MasterCard payment network. Interchange fees from cardholder transactions represent a percentage of the underlying transaction value and are recognized daily, concurrently with transaction processing services provided to the cardholder.

WMG Fee Income (Gross): The Corporation earns wealth management fees from its contracts with customers to manage assets for investment, and/or to conduct transactions on their accounts. These fees are primarily earned over time as the Corporation provides the contracted monthly or quarterly services and are generally assessed based on a tiered scale of the market value of assets under management (AUM) at quarter-end.

CFS Fee and Commission Income (Net): The Corporation earns fees from investment brokerage services provided to its customers by a third-party service provider. The Corporation receives commissions from the third-party service provider on a monthly basis based upon customer activity for the month. The Corporation (i) acts as an agent in arranging the relationship between the customer and the third-party service provider and (ii) does not control the services rendered to the customers. Investment brokerage fees are presented net of related costs. The Corporation also earns fees from tax services provided to its customers.

Net Gains/Losses on Sales of OREO: The Corporation records a gain or loss from the sale of OREO when control of the property transfers to the buyer, which generally occurs at the time of an executed deed. When the Corporation finances the sale of OREO to the buyer, the Corporation assesses whether the buyer is committed to perform their obligations under the contract and whether collectability of the transaction price is probable. Once these criteria are met, the OREO asset is derecognized and the gain or loss on sale is recorded upon the transfer of control of the property to the buyer. In determining the gain or loss on the sale, the Corporation adjusts the transaction price and related gain (loss) on sale if a significant financing component is present.