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Loans Receivable (excluding Covered Loans) - Loans on Non-accrual Status (Details) (USD $)
6 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans by portfolio segment $ 4,220,000wfsl_LoansandLeasesReceivableImpairedNonperformingNonaccrualInterestIncomeRecognized  
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status 100.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans 100.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 3,108,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans  
Loans and Leases Receivable, Ratio of Nonperforming Loans to Total Assets if Deemed Nonperforming 3.75%wfsl_LoansandLeasesReceivableRatioofNonperformingLoanstoTotalAssetsifDeemedNonperforming  
Single-Family Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status 79.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
84.80%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Construction - Speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status 1.50%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_ConstructionSpeculativeMember
1.70%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_ConstructionSpeculativeMember
Land - Acquisition & Development [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status 0.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_LandAcquisitionAndDevelopmentMember
0.90%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_LandAcquisitionAndDevelopmentMember
Land - Consumer Lot Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status 3.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_LandConsumerLotLoansMember
3.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_LandConsumerLotLoansMember
Multi-Family [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status 0.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_MultiFamilyHousingPortfolioSegmentMember
2.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_MultiFamilyHousingPortfolioSegmentMember
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status 7.60%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
5.80%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial & Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status 6.60%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_CommercialAndIndustrialLoansMember
0.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_CommercialAndIndustrialLoansMember
HELOC [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status 1.50%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_HomeEquityLineOfCreditMember
0.90%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wfsl_HomeEquityLineOfCreditMember
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status 0.80%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
0.90%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Recorded Investment, Less than 90 Days Past Due, Classified as Substandard $ 77,912,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember