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New Accounting Pronouncements (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014
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New Accounting Pronouncements [Abstract] |
Affordable Housing Tax Credits Expected to be Recognized in Current FIscal Year | $ 3
Affordable Housing Tax Credits, Net Investment Balance Recognized | 33
Affordable Housing Tax Credits, Income Tax Expense Expected to be Recognized in Current Fiscal Year | 4
Affordable Housing Tax Credits, Contingent Commitments for Equity Contributions in Current Fiscal Year [Member] | $ 31

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- Definition Affordable Housing Tax Credits, Contingent Commitments for Equity Contributions in Current Fiscal Year + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Affordable Housing Tax Credits Expected to be Recognized in Current FIscal Year + References No definition available. + Details
Name: | wfsl_AffordableHousingTaxCreditsExpectedtobeRecognizedinCurrentFIscalYear
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Affordable Housing Tax Credits, Income Tax Expense Expected to be Recognized in Current Fiscal Year + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Affordable Housing Tax Credits, Net Investment Balance Recognized + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | wfsl_
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Period Type: | duration