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Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
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Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Allowance for credit losses associated with loan commitments | $ 1,639 | $ 741 | $ 684 | $ 574
Liability associated with letters of credit | $ 200 | $ 200 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 + Details
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Period Type: | instant

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