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Loans Receivable (excluding Covered Loans) - Troubled Debt Restructurings (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
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis point reduction, minimum			100.00%wfsl_LoanModificationBasisPointReductionMinimum
Basis point reduction, maximum			200.00%wfsl_LoanModificationBasisPointReductionMaximum
Percentage of restructured loans	85.60%wfsl_SingleFamilyResidentialLoansAsPercentageOfRestructuredLoans		85.60%wfsl_SingleFamilyResidentialLoansAsPercentageOfRestructuredLoans
Number of contracts (in contracts)	21wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod	24wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod	61wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod	42wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod
Pre-modification outstanding recorded investment	$ 6,559wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod	$ 4,301wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod	$ 17,494wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod	$ 7,425wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod
Post-modification outstanding recorded investment	6,559wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod	4,301wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod	17,494wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod	7,425wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod
Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)	14wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	23wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	49wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	38wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Pre-modification outstanding recorded investment	2,664wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	4,218wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	12,264wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	7,067wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Post-modification outstanding recorded investment	2,664wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	4,218wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	12,264wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	7,067wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)			2wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember	0wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember
Pre-modification outstanding recorded investment			718wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember	0wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember
Post-modification outstanding recorded investment			718wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember	0wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember
Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)			0wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember	0wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember
Pre-modification outstanding recorded investment			0wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember	0wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember
Post-modification outstanding recorded investment			0wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember	0wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember
Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)	4wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	1wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	6wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	4wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Pre-modification outstanding recorded investment	720wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	83wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	1,252wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	358wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Post-modification outstanding recorded investment	720wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	83wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	1,252wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	358wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)	3wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	0wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	3wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	0wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Pre-modification outstanding recorded investment	3,175wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	0wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	3,175wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	0wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Post-modification outstanding recorded investment	3,175wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	0wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	3,175wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	0wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)			1wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	0wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Pre-modification outstanding recorded investment			85wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	0wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Post-modification outstanding recorded investment			$ 85wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	$ 0wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term for payment and rate reduction			6 months
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term for payment and rate reduction			12 months

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