Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation — The accompanying unaudited interim financial statements of Wesbanco, Inc. and its consolidated subsidiaries (“Wesbanco” or the "Company") have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2025. Wesbanco’s interim financial statements have been prepared following the significant accounting policies disclosed in Note 1 of the Notes to the Consolidated Financial Statements of its 2025 Annual Report on Form 10-K filed with the Securities and Exchange Commission ("SEC"), as well as with the policy changes indicated below. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly Wesbanco’s financial position and results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year.
Recent accounting pronouncements	Recent accounting pronouncements—The Financial Accounting Standards Board (“FASB”) issued Accounting Standards Updates (“ASU”) as noted below. ASU 2025‑12 — Codification Improvements In December 2025, the FASB issued ASU 2025‑12, “Codification Improvements.” This Update is part of the Board’s ongoing effort to address technical corrections, clarifications, and minor improvements across the FASB Accounting Standards Codification. These improvements refine the application of existing guidance, resolve inconsistencies, and improve the usability of the Codification without introducing significant changes to accounting practice or requiring substantial implementation effort. The amendments are not expected to significantly affect current practice. However, updates will be reviewed for any potential effects on accounting policies or disclosure processes. The amendments in this Update are effective for all entities for annual periods beginning after December 15, 2026, including interim periods within those annual periods. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements. ASU 2025‑11 — Interim Reporting (Topic 270): Narrow‑Scope Improvements In December 2025, the FASB issued ASU 2025‑11, “Interim Reporting (Topic 270): Narrow‑Scope Improvements.” The amendments are intended to improve the navigability and clarity of interim reporting requirements under Topic 270. The Update clarifies when Topic 270 applies, adds a comprehensive list of required interim disclosures, and introduces a disclosure principle requiring entities to disclose events occurring after the most recent annual period that have a material impact on the entity. The Update does not expand or reduce overall interim disclosure requirements but instead compiles and organizes them to improve consistency and comparability. The guidance also clarifies form‑and‑content expectations for interim financial statements, including the use of condensed statements, and aligns GAAP with prior SEC requirements regarding material events. The amendments are effective for interim reporting periods beginning after December 15, 2027, for public business entities and one year later for all other entities. Early adoption is permitted, with prospective or retrospective application available. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements. ASU 2025‑10 — Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities In December 2025, the FASB issued ASU 2025‑10, “Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities.” The amendments establish authoritative U.S. GAAP for the recognition, measurement, and presentation of government grants received by business entities. Historically, in the absence of explicit guidance, entities analogized to IAS 20 or ASC 958‑605, resulting in diversity in practice. ASU 2025‑10 adopts a model largely based on IAS 20, with revisions for U.S. GAAP. Under this Update, a government grant is defined as a transfer of a monetary or tangible nonmonetary asset from a governmental body in a non‑exchange transaction. The guidance excludes transactions such as income‑tax credits under Topic 740, below‑market interest rate loans, government guarantees, contributions from nongovernmental sources, and transfers of intangible assets or services. Recognition is required when it is probable that the entity will comply with grant conditions and the grant will be received. Grants related to assets are recognized as the related costs are incurred; grants related to income are recognized as the related expenses are incurred. The amendments are effective for public business entities for annual periods beginning after December 15, 2028, and one year later for all other entities. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements. ASU 2025-09 — Derivatives and Hedging (Topic 815): Hedging Accounting Improvements In November 2025, the FASB issued ASU 2025‑09, “Derivatives and Hedging (Topic 815): Hedge Accounting Improvements.” The amendments in this Update enhance and clarify several aspects of hedge accounting to better align financial reporting with the economics of an entity’s risk‑management activities. The guidance addresses key areas including similar risk assessments for groups of forecasted transactions, hedging of forecasted interest payments on “choose‑your‑rate” debt instruments, hedging of nonfinancial forecasted transactions, use of net written options as hedging instruments, and the treatment of foreign currency‑denominated debt in certain dual hedging strategies. The amendments allow a broader set of forecasted transactions to qualify for hedge accounting by focusing on “similar risk exposure” rather than requiring identical risk characteristics. Entities must evaluate this criterion at hedge inception and on an ongoing basis, using qualitative assessments where appropriate. The amendments in this Update are effective for public business entities for annual periods beginning after December 15, 2026, and one year later for all other entities. Early adoption is permitted. Adoption is prospective, with transition provisions available to facilitate migration of existing hedging relationships. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements. ASU 2025-08 — Financial Instruments—Credit Losses (Topic 326): Purchased Loans In November 2025, the FASB issued ASU 2025‑08, “Financial Instruments—Credit Losses (Topic 326): Purchased Loans.” The amendments in this update make significant changes to the accounting for certain acquired seasoned loans subject to the current expected credit losses ("CECL") methodology. The Board decided not to change the existing models for originated assets, purchased credit deteriorated ("PCD") assets or other acquired assets. Under the ASU, the initial allowance for credit losses recorded upon the acquisition of loans in scope is recognized as an adjustment to the amortized cost basis of the loan–similar to the PCD model. For these loans, the “day-one” credit loss estimate does not impact earnings immediately but rather is amortized over time as an adjustment to interest income. Subsequent changes in the allowance for credit losses are reported in earnings within credit loss expense. The amendments in this Update are effective for all entities for fiscal years beginning after December 15, 2026, including interim periods within those fiscal years, and are to be applied prospectively to loans acquired on or after the date of adoption. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements. ASU 2025-07 — Derivatives and Hedging (Topic 815) and Revenue from Contracts with Customers (Topic 606) In September 2025, the FASB issued ASU 2025-07, “Derivatives and Hedging (Topic 815) and Revenue from Contracts with Customers (Topic 606).” The amendments in this Update apply to all entities that enter into non exchange-traded contracts with underlyings based on operations or activities specific to one of the parties to the contract. The amendments in this Update exclude from derivative accounting non exchange-traded contracts with underlyings that are based on operations or activities specific to one of the parties to the contract. However, this scope exception does not apply to (1) variables based on a market rate, market price, or market index, (2) variables based on the price or performance of a financial asset or financial liability of one of the parties to the contract, (3) contracts (or features) involving the issuer’s own equity that are evaluated under the guidance in Subtopic 815-40, Derivatives and Hedging—Contracts in Entity’s Own Equity, and (4) call options and put options on debt instruments. The amendments in this Update are effective for all entities for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements. ASU 2025-05 — Financial Instruments—Credit Losses (Topic 326) In July 2025, the FASB issued ASU 2025-05, “Financial Instruments – Credit Losses (Topic 326).” The amendments provide (1) all entities with a practical expedient when estimating expected credit losses for current accounts receivable and current contract assets arising from transactions accounted for under Topic 606 and (2) entities other than public business entities with an accounting policy election for those same asset classes. The amendments will be effective for annual reporting periods beginning after December 15, 2025, and interim reporting periods within those annual reporting periods. The Company adopted ASU 2025‑05 effective January 1, 2026 and elected the practical expedient for in-scope current accounts receivable and contract assets. Loans and other financial assets measured at amortized cost are not within the scope of this guidance. Therefore, the adoption of this pronouncement does not have a material impact on the Consolidated Financial Statements, including the allowance for credit losses. ASU 2025-01 & 2024-03 — Income Statement — Reporting Comprehensive Income –Expense Disaggregation Disclosures (Subtopic 220-40) In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures.” The amendments in this Update improve financial reporting by requiring that public business entities disclose additional information about specific expense categories in the notes to financial statements at interim and annual reporting periods. This information is generally not presented in the financial statements today. For Wesbanco, the amendments in this Update are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. In January 2025, the FASB issued ASU 2025-01, “Income Statement — Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40).” The amendment in this Update amends the effective date of ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. The adoption of these pronouncements is not expected to have a material impact on the Consolidated Financial Statements, but is expected to result in additional disclosures and potential changes to the line items on the Consolidated Statement of Income.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2026

Basis of presentation — The accompanying unaudited interim financial statements of Wesbanco, Inc. and its consolidated subsidiaries (“Wesbanco” or the "Company") have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2025.

Wesbanco’s interim financial statements have been prepared following the significant accounting policies disclosed in Note 1 of the Notes to the Consolidated Financial Statements of its 2025 Annual Report on Form 10-K filed with the Securities and Exchange Commission ("SEC"), as well as with the policy changes indicated below. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly Wesbanco’s financial position and results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year.

Recent accounting pronouncements

Recent accounting pronouncements—The Financial Accounting Standards Board (“FASB”) issued Accounting Standards Updates (“ASU”) as noted below.

ASU 2025‑12 — Codification Improvements

In December 2025, the FASB issued ASU 2025‑12, “Codification Improvements.” This Update is part of the Board’s ongoing effort to address technical corrections, clarifications, and minor improvements across the FASB Accounting Standards Codification. These improvements refine the application of existing guidance, resolve inconsistencies, and improve the usability of the Codification without introducing significant changes to accounting practice or requiring substantial implementation effort. The amendments are not expected to significantly affect current practice. However, updates will be reviewed for any potential effects on accounting policies or disclosure processes.

The amendments in this Update are effective for all entities for annual periods beginning after December 15, 2026, including interim periods within those annual periods. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements.

ASU 2025‑11 — Interim Reporting (Topic 270): Narrow‑Scope Improvements

In December 2025, the FASB issued ASU 2025‑11, “Interim Reporting (Topic 270): Narrow‑Scope Improvements.” The amendments are intended to improve the navigability and clarity of interim reporting requirements under Topic 270. The Update clarifies when Topic 270 applies, adds a comprehensive list of required interim disclosures, and introduces a disclosure principle requiring entities to disclose events occurring after the most recent annual period that have a material impact on the entity.

The Update does not expand or reduce overall interim disclosure requirements but instead compiles and organizes them to improve consistency and comparability. The guidance also clarifies form‑and‑content expectations for interim financial statements, including the use of condensed statements, and aligns GAAP with prior SEC requirements regarding material events.

The amendments are effective for interim reporting periods beginning after December 15, 2027, for public business entities and one year later for all other entities. Early adoption is permitted, with prospective or retrospective application available. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements.

ASU 2025‑10 — Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities

In December 2025, the FASB issued ASU 2025‑10, “Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities.” The amendments establish authoritative U.S. GAAP for the recognition, measurement, and presentation of government grants received by business entities. Historically, in the absence of explicit guidance, entities analogized to IAS 20 or ASC 958‑605, resulting in diversity in practice. ASU 2025‑10 adopts a model largely based on IAS 20, with revisions for U.S. GAAP.

Under this Update, a government grant is defined as a transfer of a monetary or tangible nonmonetary asset from a governmental body in a non‑exchange transaction. The guidance excludes transactions such as income‑tax credits under Topic 740, below‑market interest rate loans, government guarantees, contributions from nongovernmental sources, and transfers of intangible assets or services. Recognition is required when it is probable that the entity will comply with grant conditions and the grant will be received. Grants related to assets are recognized as the related costs are incurred; grants related to income are recognized as the related expenses are incurred.

The amendments are effective for public business entities for annual periods beginning after December 15, 2028, and one year later for all other entities. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements.

ASU 2025-09 — Derivatives and Hedging (Topic 815): Hedging Accounting Improvements

In November 2025, the FASB issued ASU 2025‑09, “Derivatives and Hedging (Topic 815): Hedge Accounting Improvements.” The amendments in this Update enhance and clarify several aspects of hedge accounting to better align financial reporting with the economics of an entity’s

risk‑management activities. The guidance addresses key areas including similar risk assessments for groups of forecasted transactions, hedging of forecasted interest payments on “choose‑your‑rate” debt instruments, hedging of nonfinancial forecasted transactions, use of net written options as hedging instruments, and the treatment of foreign currency‑denominated debt in certain dual hedging strategies. The amendments allow a broader set of forecasted transactions to qualify for hedge accounting by focusing on “similar risk exposure” rather than requiring identical risk characteristics. Entities must evaluate this criterion at hedge inception and on an ongoing basis, using qualitative assessments where appropriate.

The amendments in this Update are effective for public business entities for annual periods beginning after December 15, 2026, and one year later for all other entities. Early adoption is permitted. Adoption is prospective, with transition provisions available to facilitate migration of existing hedging relationships. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements.

ASU 2025-08 — Financial Instruments—Credit Losses (Topic 326): Purchased Loans

In November 2025, the FASB issued ASU 2025‑08, “Financial Instruments—Credit Losses (Topic 326): Purchased Loans.” The amendments in this update make significant changes to the accounting for certain acquired seasoned loans subject to the current expected credit losses ("CECL") methodology. The Board decided not to change the existing models for originated assets, purchased credit deteriorated ("PCD") assets or other acquired assets.

Under the ASU, the initial allowance for credit losses recorded upon the acquisition of loans in scope is recognized as an adjustment to the amortized cost basis of the loan–similar to the PCD model. For these loans, the “day-one” credit loss estimate does not impact earnings immediately but rather is amortized over time as an adjustment to interest income. Subsequent changes in the allowance for credit losses are reported in earnings within credit loss expense.

The amendments in this Update are effective for all entities for fiscal years beginning after December 15, 2026, including interim periods within those fiscal years, and are to be applied prospectively to loans acquired on or after the date of adoption. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements.

ASU 2025-07 — Derivatives and Hedging (Topic 815) and Revenue from Contracts with Customers (Topic 606)

In September 2025, the FASB issued ASU 2025-07, “Derivatives and Hedging (Topic 815) and Revenue from Contracts with Customers (Topic 606).” The amendments in this Update apply to all entities that enter into non exchange-traded contracts with underlyings based on operations or activities specific to one of the parties to the contract. The amendments in this Update exclude from derivative accounting non exchange-traded contracts with underlyings that are based on operations or activities specific to one of the parties to the contract. However, this scope exception does not apply to (1) variables based on a market rate, market price, or market index, (2) variables based on the price or performance of a financial asset or financial liability of one of the parties to the contract, (3) contracts (or features) involving the issuer’s own equity that are evaluated under the guidance in Subtopic 815-40, Derivatives and Hedging—Contracts in Entity’s Own Equity, and (4) call options and put options on debt instruments. The amendments in this Update are effective for all entities for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on the Consolidated Financial Statements.

ASU 2025-05 — Financial Instruments—Credit Losses (Topic 326)

In July 2025, the FASB issued ASU 2025-05, “Financial Instruments – Credit Losses (Topic 326).” The amendments provide (1) all entities with a practical expedient when estimating expected credit losses for current accounts receivable and current contract assets arising from transactions accounted for under Topic 606 and (2) entities other than public business entities with an accounting policy election for those same asset classes. The amendments will be effective for annual reporting periods beginning after December 15, 2025, and interim reporting periods within those annual reporting periods. The Company adopted ASU 2025‑05 effective January 1, 2026 and elected the practical expedient for in-scope current accounts receivable and contract assets. Loans and other financial assets measured at amortized cost are not within the scope of this guidance. Therefore, the adoption of this pronouncement does not have a material impact on the Consolidated Financial Statements, including the allowance for credit losses.

ASU 2025-01 & 2024-03 — Income Statement — Reporting Comprehensive Income –Expense Disaggregation Disclosures (Subtopic 220-40)

In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures.” The amendments in this Update improve financial reporting by requiring that public business entities disclose additional information about specific expense categories in the notes to financial statements at interim and annual reporting periods. This information is generally not presented in the financial statements today. For Wesbanco, the amendments in this Update are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted.

In January 2025, the FASB issued ASU 2025-01, “Income Statement — Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40).” The amendment in this Update amends the effective date of ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. The adoption of these pronouncements is not expected to have a material impact on the Consolidated Financial Statements, but is expected to result in additional disclosures and potential changes to the line items on the Consolidated Statement of Income.