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

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