XML 31 R32.htm IDEA: XBRL DOCUMENT v2.4.1.9

Loans Receivable (excluding Covered Loans) - Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014 contract	Dec. 31, 2013 contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis point reduction, minimum	1.00%wfsl_LoanModificationBasisPointReductionMinimum
Basis point reduction, maximum	2.00%wfsl_LoanModificationBasisPointReductionMaximum
Single family residential loans as percentage of restructured loans	86.60%wfsl_SingleFamilyResidentialLoansAsPercentageOfRestructuredLoans
Number of contracts (in contracts)	40wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod	124wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod
Pre-modification outstanding recorded investment	$ 10,935wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod	$ 27,028wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod
Post-modification outstanding recorded investment	10,935wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod	27,028wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod
Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)	35wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	113wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Pre-modification outstanding recorded investment	9,600wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	23,607wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Post-modification outstanding recorded investment	9,600wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	23,607wfsl_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
Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)	2wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	5wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Pre-modification outstanding recorded investment	532wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	1,098wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Post-modification outstanding recorded investment	532wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember	1,098wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)	0wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember	2wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
Pre-modification outstanding recorded investment	0wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember	1,213wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
Post-modification outstanding recorded investment	0wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember	1,213wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)	0wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	1wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Pre-modification outstanding recorded investment	0wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	810wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Post-modification outstanding recorded investment	0wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	810wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)	0wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember	1wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
Pre-modification outstanding recorded investment	0wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember	261wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
Post-modification outstanding recorded investment	0wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember	261wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts (in contracts)	1wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	2wfsl_FinancingReceivableModificationsNumberOfContractsDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Pre-modification outstanding recorded investment	85wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	39wfsl_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Post-modification outstanding recorded investment	$ 85wfsl_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	$ 39wfsl_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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