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v3.21.1

Fair Value Measurement - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Fair Value Disclosures [Abstract] |  |
Fair value transfer amount | $ 0 | $ 0

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

X
- Definition The amount of the transfers between levels of the fair value hierarchy. + References No definition available. + Details
Name: | wsbc_FairValueTransfersBetweenLevel
Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration