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Commitments and Contingent Liabilities - Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Commitments And Contingencies Disclosure [Abstract] |  |
Lines of credit | $ 2,497,734 | $ 2,510,011
Loans approved but not closed | 470,736 | 381,180
Overdraft limits | 153,374 | 154,322
Letters of credit | 53,136 | 53,788
Contingent obligations and other guarantees | $ 199,066 | $ 126,984

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contingent obligations to purchase loans funded by other entities. + References No definition available. + Details
Name: | wsbc_ContingentObligationsToPurchaseLoansFundedByOtherEntities
Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unused portions of various lines of credit products. + References No definition available. + Details
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Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Credit offerings by the bank to customer in which the customer has either not completed the closing or accepted the offer. + References No definition available. + Details
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Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unused portion of available funds under overdraft programs on deposit programs. + References No definition available. + Details
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Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant