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Loans Receivable (excluding Covered Loans) - Schedule of Loans Receivable (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 8,793,428 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 8,669,717 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount |
Ratio of type of loan to total loans receivable | 100.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans | 100.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans |
Allowance for probable losses | 108,700 us-gaap_FinancingReceivableAllowanceForCreditLosses | 112,347 us-gaap_FinancingReceivableAllowanceForCreditLosses | 116,741 us-gaap_FinancingReceivableAllowanceForCreditLosses
Loans in process | 370,655 us-gaap_LoansAndLeasesReceivableLoansInProcess | 346,172 us-gaap_LoansAndLeasesReceivableLoansInProcess |
Discount on acquired loans | 22,535 wfsl_DiscountOnAcquiredLoans | 25,391 wfsl_DiscountOnAcquiredLoans |
Deferred net origination fees | 37,621 us-gaap_LoansAndLeasesReceivableDeferredIncome | 37,485 us-gaap_LoansAndLeasesReceivableDeferredIncome |
Charges against loans receivable | 539,511 wfsl_LoansAndLeasesReceivableChargesToAllowanceLoansInProcessAndDeferredFees | 521,395 wfsl_LoansAndLeasesReceivableChargesToAllowanceLoansInProcessAndDeferredFees |
Loans receivable, net | 8,253,917 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 8,148,322 us-gaap_LoansAndLeasesReceivableNetReportedAmount |
Single-Family Residential [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 5,619,694 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 5,572,244 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 64.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 64.20%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Allowance for probable losses | 55,495 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 62,763 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 64,184 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Construction - Speculative [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 152,450 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember | 140,060 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember |
Ratio of type of loan to total loans receivable | 1.70%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember | 1.60%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember |
Allowance for probable losses | 5,451 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember | 6,742 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember | 8,407 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember
Construction - Custom [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 377,561 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember | 385,824 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember |
Ratio of type of loan to total loans receivable | 4.30%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember | 4.50%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember |
Allowance for probable losses | 965 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember | 1,695 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember | 882 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember
Land - Acquisition & Development [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 86,405 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 80,359 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember |
Ratio of type of loan to total loans receivable | 1.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 0.90%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember |
Allowance for probable losses | 6,671 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 5,592 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 9,165 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember
Land - Consumer Lot Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 106,988 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 111,130 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember |
Ratio of type of loan to total loans receivable | 1.20%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 1.30%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember |
Allowance for probable losses | 3,113 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 3,077 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 3,552 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember
Multi-Family [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 980,706 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 920,285 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 11.20%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 10.60%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember |
Allowance for probable losses | 4,500 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 4,248 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 3,816 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 749,856 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 752,957 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 8.50%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 8.70%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Allowance for probable losses | 5,872 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 7,548 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 5,595 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial & Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 453,418 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 434,088 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember |
Ratio of type of loan to total loans receivable | 5.20%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 5.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember |
Allowance for probable losses | 23,328 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 16,527 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 16,614 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember
HELOC [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 134,998 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 134,455 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember |
Ratio of type of loan to total loans receivable | 1.50%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 1.60%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember |
Allowance for probable losses | 892 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 928 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 1,002 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 131,352 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 138,315 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 1.40%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 1.60%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
Allowance for probable losses | 2,413 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 3,227 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 3,524 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Non-Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 8,538,202 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember | 8,409,022 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember |
Ratio of type of loan to total loans receivable | 97.30%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember | 97.20%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember |
Non-Acquired Loans [Member] | Single-Family Residential [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 5,608,208 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 5,560,203 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 63.90%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 64.10%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Non-Acquired Loans [Member] | Construction - Speculative [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 152,450 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember | 140,060 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember |
Ratio of type of loan to total loans receivable | 1.70%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember | 1.60%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember |
Non-Acquired Loans [Member] | Construction - Custom [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 377,561 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember | 385,824 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember |
Ratio of type of loan to total loans receivable | 4.30%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember | 4.50%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionCustomMember |
Non-Acquired Loans [Member] | Land - Acquisition & Development [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 84,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 77,832 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember |
Ratio of type of loan to total loans receivable | 1.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 0.90%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember |
Non-Acquired Loans [Member] | Land - Consumer Lot Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 104,492 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 108,623 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember |
Ratio of type of loan to total loans receivable | 1.20%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 1.30%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember |
Non-Acquired Loans [Member] | Multi-Family [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 977,752 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 917,286 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 11.20%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 10.60%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember |
Non-Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 597,436 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 591,336 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 6.80%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 6.90%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Non-Acquired Loans [Member] | Commercial & Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 391,327 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 379,226 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember |
Ratio of type of loan to total loans receivable | 4.50%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 4.40%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember |
Non-Acquired Loans [Member] | HELOC [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 118,047 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 116,042 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember |
Ratio of type of loan to total loans receivable | 1.30%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 1.40%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember |
Non-Acquired Loans [Member] | Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 126,929 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 132,590 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 1.40%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 1.50%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_NonAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 180,572 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember | 181,355 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember |
Ratio of type of loan to total loans receivable | 1.90%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember | 2.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember |
Acquired Loans [Member] | Single-Family Residential [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 11,163 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 11,716 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 0.10%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 0.10%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Acquired Loans [Member] | Land - Acquisition & Development [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 872 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 905 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember |
Ratio of type of loan to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember |
Acquired Loans [Member] | Land - Consumer Lot Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 2,496 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 2,507 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember |
Ratio of type of loan to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember |
Acquired Loans [Member] | Multi-Family [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 2,954 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 2,999 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 92,133 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 97,898 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 1.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 1.10%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Acquired Loans [Member] | Commercial & Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 58,836 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 51,386 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember |
Ratio of type of loan to total loans receivable | 0.70%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 0.60%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember |
Acquired Loans [Member] | HELOC [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 7,749 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 8,274 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember |
Ratio of type of loan to total loans receivable | 0.10%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 0.10%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember |
Acquired Loans [Member] | Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 4,369 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 5,670 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 0.10%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_AcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
Credit Impaired Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 74,654 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember | 79,340 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember |
Ratio of type of loan to total loans receivable | 0.80%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember | 0.80%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember |
Credit Impaired Acquired Loans [Member] | Single-Family Residential [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 323 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 325 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Credit Impaired Acquired Loans [Member] | Land - Acquisition & Development [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 1,533 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 1,622 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember |
Ratio of type of loan to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember |
Credit Impaired Acquired Loans [Member] | Multi-Family [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember |
Credit Impaired Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 60,287 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 63,723 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 0.70%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 0.70%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Credit Impaired Acquired Loans [Member] | Commercial & Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 3,255 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 3,476 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember |
Ratio of type of loan to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember |
Credit Impaired Acquired Loans [Member] | HELOC [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 9,202 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 10,139 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember |
Ratio of type of loan to total loans receivable | 0.10%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 0.10%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember |
Credit Impaired Acquired Loans [Member] | Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 54 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | $ 55 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
Ratio of type of loan to total loans receivable | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 0.00%wfsl_LoansAndLeasesReceivableRatioOfLoanTypeToAllLoans / us-gaap_BusinessAcquisitionAxis = wfsl_CreditImpairedAcquiredLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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