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Allowance for Loan Losses and Credit Quality Information - Schedule of Loans Identified as Troubled Debt Restructurings During Periods Indicated (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Financing Receivable, Modifications [Line Items]    
Total loans identified during the period $ 347wsfs_TroubledDebtRestructuringIdentifiedDuringPeriod $ 642wsfs_TroubledDebtRestructuringIdentifiedDuringPeriod
Residential [Member]    
Financing Receivable, Modifications [Line Items]    
Total loans identified during the period 212wsfs_TroubledDebtRestructuringIdentifiedDuringPeriod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 279wsfs_TroubledDebtRestructuringIdentifiedDuringPeriod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Consumer [Member]    
Financing Receivable, Modifications [Line Items]    
Total loans identified during the period $ 135wsfs_TroubledDebtRestructuringIdentifiedDuringPeriod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 $ 363wsfs_TroubledDebtRestructuringIdentifiedDuringPeriod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember