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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
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	426,836us-gaap_LoansAndLeasesReceivableLoansInProcess	346,172us-gaap_LoansAndLeasesReceivableLoansInProcess
Loans and Leases Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans in process	613,219us-gaap_LoansAndLeasesReceivableLoansInProcess / us-gaap_FinancialInstrumentAxis = wfsl_LoansAndLeasesReceivableMember	583,838us-gaap_LoansAndLeasesReceivableLoansInProcess / us-gaap_FinancialInstrumentAxis = wfsl_LoansAndLeasesReceivableMember
Restatement Adjustment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate acquired through foreclosure			8,200us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Decrease in accrued interest receivable			$ 8,900us-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

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- Definition

Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements.

+ References

No definition available.

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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

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