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Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Detail) (Parenthetical) (Detail) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |
Percentage of Federal and State income tax rate | 23.00% | 23.00%

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- References No definition available. + Details
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- Definition Income tax expense benefit combined federal and state income tax rate. + References No definition available. + Details
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Namespace Prefix: | wsbc_
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