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Loans Receivable (excluding Covered Loans) - Loan Modifications (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2015 contract | Mar. 31, 2014 contract | Mar. 31, 2015 contract | Mar. 31, 2014 contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | 4 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted | 24 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted | 10 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted | 42 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted
Recorded investment | $ 605 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod | $ 4,301 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod | $ 1,626 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod | $ 7,425 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
Single-Family Residential [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | 2 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 23 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 7 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 38 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Recorded investment | 304 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 4,218 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 1,237 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 7,067 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Land - Consumer Lot Loans [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts (in contracts) | 2 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 1 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 3 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 4 wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Recorded investment | $ 301 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | $ 83 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | $ 389 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | $ 358 wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember

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