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Allowance for Loan Losses and Credit Quality Information - Analysis of Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending Loan Balances $ 43,179us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment $ 46,651us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment $ 51,707us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Loans with No Related Reserve 18,889wsfs_ImpairedLoansWithNoSpecificReserve 17,802wsfs_ImpairedLoansWithNoSpecificReserve  
Loans with Related Reserve 24,290wsfs_ImpairedLoansWithSpecificReserve 28,849wsfs_ImpairedLoansWithSpecificReserve  
Related Reserve 4,834wsfs_ImpairedLoansRelatedSpecificReserve 5,317wsfs_ImpairedLoansRelatedSpecificReserve  
Contractual Principal Balances 50,634wsfs_ImpairedLoansContractualPrincipalBalances 66,563wsfs_ImpairedLoansContractualPrincipalBalances  
Average Loan Balances 45,609wsfs_ImpairedLoansAverageLoanBalances 45,629wsfs_ImpairedLoansAverageLoanBalances  
Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending Loan Balances 11,707us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 12,381us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 4,583us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Loans with No Related Reserve 592wsfs_ImpairedLoansWithNoSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 580wsfs_ImpairedLoansWithNoSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		  
Loans with Related Reserve 11,115wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 11,801wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		  
Related Reserve 3,169wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 3,034wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		  
Contractual Principal Balances 12,491wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 20,924wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		  
Average Loan Balances 7,293wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 5,952wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		  
Owner Occupied Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending Loan Balances 1,552us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		 2,474us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		 6,318us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember
Loans with No Related Reserve 1,268wsfs_ImpairedLoansWithNoSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		 1,865wsfs_ImpairedLoansWithNoSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		  
Loans with Related Reserve 284wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		 609wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		  
Related Reserve 284wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		 609wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		  
Contractual Principal Balances 2,625wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		 3,708wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		  
Average Loan Balances 3,732wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		 4,461wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_OwnerOccupiedCommercialMember		  
Commercial Mortgages [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending Loan Balances 7,595us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		 8,335us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		 15,786us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember
Loans with No Related Reserve 4,167wsfs_ImpairedLoansWithNoSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		 4,732wsfs_ImpairedLoansWithNoSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		  
Loans with Related Reserve 3,428wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		 3,603wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		  
Related Reserve 223wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		 319wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		  
Contractual Principal Balances 10,516wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		 14,383wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		  
Average Loan Balances 10,792wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		 11,005wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsfs_CommercialMortgagesMember		  
Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending Loan Balances 1,419us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		 1,419us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		 1,070us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
Loans with Related Reserve 1,419wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		 1,419wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		  
Related Reserve 210wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		 334wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		  
Contractual Principal Balances 1,419wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		 1,419wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		  
Average Loan Balances 1,065wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		 1,013wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		  
Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending Loan Balances 14,749us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 15,666us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 18,413us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Loans with No Related Reserve 7,987wsfs_ImpairedLoansWithNoSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 7,068wsfs_ImpairedLoansWithNoSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		  
Loans with Related Reserve 6,762wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 8,598wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		  
Related Reserve 751wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 790wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		  
Contractual Principal Balances 16,815wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 18,967wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		  
Average Loan Balances 16,676wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 17,296wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		  
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending Loan Balances 6,157us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 6,376us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 5,537us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Loans with No Related Reserve 4,875wsfs_ImpairedLoansWithNoSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 3,557wsfs_ImpairedLoansWithNoSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		  
Loans with Related Reserve 1,282wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 2,819wsfs_ImpairedLoansWithSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		  
Related Reserve 197wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 231wsfs_ImpairedLoansRelatedSpecificReserve
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		  
Contractual Principal Balances 6,768wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 7,162wsfs_ImpairedLoansContractualPrincipalBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		  
Average Loan Balances $ 6,051wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 $ 5,902wsfs_ImpairedLoansAverageLoanBalances
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember