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Loans Receivable (excluding Covered Loans) - Loans on Non-accrual Status (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 98,353 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest | $ 87,431 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest | $ 114,717 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 100.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans | 100.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans |
Single-Family Residential [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 74,416 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 74,067 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 75.60%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 84.80%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember |
Construction - Speculative [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 1,329 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember | 1,477 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember |
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 1.40%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember | 1.70%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_ConstructionSpeculativeMember |
Land - Acquisition & Development [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 0 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 811 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember |
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember | 0.90%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandAcquisitionAndDevelopmentMember |
Land - Consumer Lot Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 2,260 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 2,637 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember |
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 2.30%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember | 3.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_LandConsumerLotLoansMember |
Multi-Family [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 1,019 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 1,742 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember |
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 1.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember | 2.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_MultiFamilyHousingPortfolioSegmentMember |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 15,970 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 5,106 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 16.20%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 5.80%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Commercial & Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 672 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 7 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember |
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 0.70%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember | 0.00%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_CommercialAndIndustrialLoansMember |
HELOC [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans by portfolio segment | 1,454 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 795 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember |
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 1.50%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember | 0.90%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = wfsl_HomeEquityLineOfCreditMember |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 1,233 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | $ 789 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status | 1.30%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 0.90%wfsl_LoansAndLeasesReceivableRatioOfTypeOfNonperformingLoansToAllNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember |

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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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