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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)	4wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted	24wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted	10wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted	42wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted
Recorded investment	$ 605wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod	$ 4,301wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod	$ 1,626wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod	$ 7,425wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
Single-Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts (in contracts)	2wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	23wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	7wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	38wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Recorded investment	304wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	4,218wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	1,237wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	7,067wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Land - Consumer Lot Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts (in contracts)	2wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	1wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	3wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	4wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Recorded investment	$ 301wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	$ 83wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	$ 389wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	$ 358wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember

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