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Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Parenthetical) (Detail) | Jun. 30, 2019 USD ($) Borrower | Dec. 31, 2018 USD ($) Borrower
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Receivables [Abstract] |  |
Number of borrowers with loans greater than one million | Borrower | 3 | 1
Borrowers with large amount of loans outstanding, minimum amount of loans per borrower | $ 1,000,000.0 | $ 1,000,000.0
Borrowers with large amount of loans outstanding, net | $ 8,200,000 | $ 3,400,000

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Large amount of nonaccrual loans, outstanding, minimum loan amount per borrower. + References No definition available. + Details
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Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
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- Definition Large amount of nonaccrual loans, outstanding, net loan amount of all borrowers. + References No definition available. + Details
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- Definition Number of borrowers with nonaccrual Loan advances outstanding greater than one million U.S. dollars. + References No definition available. + Details
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Namespace Prefix: | wsbc_
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