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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014 | Dec. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Decrease in accrued interest receivable | $ (40,359)us-gaap_AccruedInvestmentIncomeReceivable | $ (52,037)us-gaap_AccruedInvestmentIncomeReceivable |
Loans in process | 426,836 us-gaap_LoansAndLeasesReceivableLoansInProcess | 346,172 us-gaap_LoansAndLeasesReceivableLoansInProcess |
Loans and Leases Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans in process | 613,219 us-gaap_LoansAndLeasesReceivableLoansInProcess / us-gaap_FinancialInstrumentAxis = wfsl_LoansAndLeasesReceivableMember | 583,838 us-gaap_LoansAndLeasesReceivableLoansInProcess / us-gaap_FinancialInstrumentAxis = wfsl_LoansAndLeasesReceivableMember |
Restatement Adjustment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Real estate acquired through foreclosure |  |  | 8,200 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Decrease in accrued interest receivable |  |  | $ 8,900 us-gaap_AccruedInvestmentIncomeReceivable / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember

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- Definition Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 7 + Details
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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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