Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of presentation — The accompanying unaudited interim financial statements of WesBanco, Inc. and its consolidated subsidiaries (“WesBanco”) 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, 2014. 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 2014 Annual Report on Form 10-K filed with the Securities and Exchange Commission. 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 — In April 2015, the Financial Accounting Standards Board (the “FASB”) issued an Accounting Standards Update (“ASU”) (ASU 2015-05) that provides guidance on when to account for a cloud computing arrangement as a software license. The guidance applies only to internal-use software that a customer obtains access to in a hosting arrangement if both of the following criteria are met: (1) The customer has the contractual right to take possession of the software at any time during the hosting period without significant penalty, (2) it is feasible for the customer to either run the software on its own hardware or contract with another party unrelated to the vendor to host the software. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on WesBanco’s Consolidated Financial Statements. In February 2015, the FASB issued ASU 2015-02 that revised the consolidation model, requiring reporting entities to reevaluate whether they should consolidate certain legal entities under the revised model. The amendments in this Update modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities, and eliminate the presumption that a general partner should consolidate and affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships. The pronouncement also provides for a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on WesBanco’s Consolidated Financial Statements. In August 2014, the FASB issued ASU 2014-14 related to the classification of certain government-guaranteed mortgage loans upon foreclosure. The amendments in this update require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) The loan has a government guarantee that is not separable from the loan before foreclosure, (2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim, (3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based upon the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014 and may be adopted under either a modified retrospective transition method or a prospective transition method. However, the same method of transition as elected under ASU 2014-04 must be applied. Early adoption is permitted. The adoption of this pronouncement did not have a material impact on WesBanco’s Consolidated Financial Statements. In June 2014, the FASB issued ASU 2014-11 related to repurchase-to-maturity transactions, repurchase financing and disclosures. The pronouncement changes the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The pronouncement also requires two new disclosures. The first disclosure requires an entity to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. The second disclosure provides increased transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. Early adoption is not permitted. The adoption of this pronouncement did not have a material impact on WesBanco’s Consolidated Financial Statements. In May 2014, the FASB issued ASU 2014-09 related to the recognition of revenue from contracts with customers. The new revenue pronouncement creates a single source of revenue guidance for all companies in all industries and is more principles-based than current revenue guidance. The pronouncement provides a five-step model for a company to recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The five steps are (1) identify the contract with the customer, (2) identify the separate performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the separate performance obligations and (5) recognize revenue when each performance obligation is satisfied. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2016 using either a full retrospective approach for all periods presented in the period of adoption or a modified retrospective approach. Early adoption is not permitted. In April 2015, the FASB issued an exposure draft of a proposed ASU that would delay by one year the effective date of ASU 2014-11. Under the proposal, the standard would be effective for annual reporting periods beginning after December 15, 2017 and interim periods therein. WesBanco is currently evaluating the impact of the adoption of this pronouncement on its Consolidated Financial Statements.

Recent accounting pronouncements — In April 2015, the Financial Accounting Standards Board (the “FASB”) issued an Accounting Standards Update (“ASU”) (ASU 2015-05) that provides guidance on when to account for a cloud computing arrangement as a software license. The guidance applies only to internal-use software that a customer obtains access to in a hosting arrangement if both of the following criteria are met: (1) The customer has the contractual right to take possession of the software at any time during the hosting period without significant penalty, (2) it is feasible for the customer to either run the software on its own hardware or contract with another party unrelated to the vendor to host the software. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on WesBanco’s Consolidated Financial Statements.

In February 2015, the FASB issued ASU 2015-02 that revised the consolidation model, requiring reporting entities to reevaluate whether they should consolidate certain legal entities under the revised model. The amendments in this Update modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities, and eliminate the presumption that a general partner should consolidate and affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships. The pronouncement also provides for a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on WesBanco’s Consolidated Financial Statements.

In August 2014, the FASB issued ASU 2014-14 related to the classification of certain government-guaranteed mortgage loans upon foreclosure. The amendments in this update require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) The loan has a government guarantee that is not separable from the loan before foreclosure, (2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim, (3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based upon the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014 and may be adopted under either a modified retrospective transition method or a prospective transition method. However, the same method of transition as elected under ASU 2014-04 must be applied. Early adoption is permitted. The adoption of this pronouncement did not have a material impact on WesBanco’s Consolidated Financial Statements.

In June 2014, the FASB issued ASU 2014-11 related to repurchase-to-maturity transactions, repurchase financing and disclosures. The pronouncement changes the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The pronouncement also requires two new disclosures. The first disclosure requires an entity to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. The second disclosure provides increased transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. Early adoption is not permitted. The adoption of this pronouncement did not have a material impact on WesBanco’s Consolidated Financial Statements.

In May 2014, the FASB issued ASU 2014-09 related to the recognition of revenue from contracts with customers. The new revenue pronouncement creates a single source of revenue guidance for all companies in all industries and is more principles-based than current revenue guidance. The pronouncement provides a five-step model for a company to recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The five steps are (1) identify the contract with the customer, (2) identify the separate performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the separate performance obligations and (5) recognize revenue when each performance obligation is satisfied. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2016 using either a full retrospective approach for all periods presented in the period of adoption or a modified retrospective approach. Early adoption is not permitted. In April 2015, the FASB issued an exposure draft of a proposed ASU that would delay by one year the effective date of ASU 2014-11. Under the proposal, the standard would be effective for annual reporting periods beginning after December 15, 2017 and interim periods therein. WesBanco is currently evaluating the impact of the adoption of this pronouncement on its Consolidated Financial Statements.