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Allowance for Loan Losses and Credit Quality Information - Schedule of Consumer Credit Exposure (Parenthetical) (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-performing loans of troubled debt restructured mortgages and home equity installment loans $ 11,400,000wsfs_NonPerformingLoans $ 11,400,000wsfs_NonPerformingLoans
Acquired nonimpaired loans 141,716,000wsfs_LoansAndLeasesReceivableAcquiredNonImpairedLoans 145,800,000wsfs_LoansAndLeasesReceivableAcquiredNonImpairedLoans
Total Residential and Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired nonimpaired loans $ 24,300,000wsfs_LoansAndLeasesReceivableAcquiredNonImpairedLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_ResidentialAndConsumerLoanMember		 $ 26,000,000wsfs_LoansAndLeasesReceivableAcquiredNonImpairedLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_ResidentialAndConsumerLoanMember