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Loans Receivable (excluding Covered Loans) - Loan Modifications (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 contract | Dec. 31, 2013 contract
Financing Receivable, Modifications [Line Items] |  |
Number of contracts (in contracts) | 11 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted | 26 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted
Recorded investment | $ 1,820 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod | $ 3,790 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
Single-Family Residential [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts (in contracts) | 8 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 24 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Recorded investment | 1,431 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 3,624 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Land - Consumer Lot Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts (in contracts) | 3 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 2 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Recorded investment | $ 389 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | $ 166 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember

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