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Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Allowance for credit losses associated with loan commitments | $ 7.6 | $ 6.1
Liability associated with letters of credit | $ 0.4 | $ 0.2

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of allowance to cover probable credit losses on loan commitments. + References No definition available. + Details
Name: | wsbc_AllowanceForLoanCommitments
Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant