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Commitments and Contingent Liabilities - Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Commitments And Contingencies Disclosure [Abstract] |  |
Lines of credit | $ 1,909,282 | $ 1,894,030
Loans approved but not closed | 299,081 | 258,778
Overdraft limits | 152,207 | 153,572
Letters of credit | 45,960 | 42,841
Contingent obligations and other guarantees | $ 48,654 | $ 61,509

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