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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 | $ 4,220,000 wfsl_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 | 3,108,000 us-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 | $ 77,912,000 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember |

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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554 + Details
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