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Covered Assets - Aging Analysis of Non-Credit Impaired Loans (Details) (Acquired Non Impaired Assets [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of Loans Net of LIP & Chg.-Offs | $ 83,445 wfsl_LoansAndLeasesReceivableCoveredLoans | $ 100,161 wfsl_LoansAndLeasesReceivableCoveredLoans
Current | 82,807 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent | 98,342 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent
30 Days | 56 wfsl_LoansAndLeasesReceivableCoveredLoans30Days | 241 wfsl_LoansAndLeasesReceivableCoveredLoans30Days
60 Days | 204 wfsl_LoansAndLeasesReceivableCoveredLoans60Days | 40 wfsl_LoansAndLeasesReceivableCoveredLoans60Days
90 Days | 378 wfsl_LoansAndLeasesReceivableCoveredAssets90Days | 1,538 wfsl_LoansAndLeasesReceivableCoveredAssets90Days
Total | 638 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue | 1,819 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue
Ratio of past due loans to total loans receivable | 0.76%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess | 1.82%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess
Single-Family Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of Loans Net of LIP & Chg.-Offs | 21,876 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 23,067 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Current | 21,306 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 22,391 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
30 Days | 27 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 230 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
60 Days | 201 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 40 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
90 Days | 342 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 406 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Total | 570 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 676 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Ratio of past due loans to total loans receivable | 2.61%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 2.93%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Land - Acquisition & Development [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of Loans Net of LIP & Chg.-Offs | 389 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 1,364 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember
Current | 353 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 1,328 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember
30 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember
60 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember
90 Days | 36 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 36 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember
Total | 36 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 36 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember
Ratio of past due loans to total loans receivable | 9.25%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 2.64%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember
Land - Consumer Lot Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of Loans Net of LIP & Chg.-Offs | 73 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 73 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Current | 73 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 73 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
30 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
60 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
90 Days | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Total | 0 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 0 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Ratio of past due loans to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 0.00%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Multi-Family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of Loans Net of LIP & Chg.-Offs | 4,250 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 6,598 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
Current | 4,250 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 5,502 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
30 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
60 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
90 Days | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 1,096 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
Total | 0 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 1,096 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
Ratio of past due loans to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 16.61%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of Loans Net of LIP & Chg.-Offs | 40,127 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 51,336 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Current | 40,127 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 51,336 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
30 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
60 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
90 Days | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Total | 0 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 0 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Ratio of past due loans to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 0.00%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial & Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of Loans Net of LIP & Chg.-Offs | 5,111 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 5,492 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember
Current | 5,111 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 5,492 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember
30 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember
60 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember
90 Days | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember
Total | 0 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 0 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember
Ratio of past due loans to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 0.00%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember
HELOC [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of Loans Net of LIP & Chg.-Offs | 11,226 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 11,777 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
Current | 11,197 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 11,777 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
30 Days | 29 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
60 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
90 Days | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
Total | 29 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 0 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
Ratio of past due loans to total loans receivable | 0.26%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 0.00%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of Loans Net of LIP & Chg.-Offs | 393 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 454 wfsl_LoansAndLeasesReceivableCoveredLoans / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Current | 390 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 443 wfsl_LoansAndLeasesReceivableCoveredLoansCurrent / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
30 Days | 0 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 11 wfsl_LoansAndLeasesReceivableCoveredLoans30Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
60 Days | 3 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 0 wfsl_LoansAndLeasesReceivableCoveredLoans60Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
90 Days | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 0 wfsl_LoansAndLeasesReceivableCoveredAssets90Days / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Total | $ 3 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | $ 11 wfsl_LoansAndLeasesReceivableCoveredAssetsPastDue / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Ratio of past due loans to total loans receivable | 0.76%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 2.42%wfsl_LoansAndLeasesReceivableCoveredLoansRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember

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