Commitments and Contingent Liabilities - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Allowance for credit losses associated with loan commitments	$ 478,000wsbc_AllowanceForLoanCommitments	$ 455,000wsbc_AllowanceForLoanCommitments	$ 545,000wsbc_AllowanceForLoanCommitments	$ 602,000wsbc_AllowanceForLoanCommitments
Liability associated with letters of credit	$ 200,000	$ 200,000

Amount of allowance to cover probable credit losses on loan commitments.

No definition available.

Name:	wsbc_AllowanceForLoanCommitments
Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant