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Covered Assets - Additional Information (Details) (USD $) | Dec. 31, 2014 | Sep. 30, 2014
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Covered Assets [Abstract] |  |
Covered assets | $ 180,883,000 wfsl_CoveredAssets | $ 200,558,000 wfsl_CoveredAssets
Acquired loans classified as non-performing | 0 wfsl_LoansandLeasesReceivableAcquiredLoansClassifiedasNonPerforming |
Covered loans, gross | 192,637,000 wfsl_LoansAndLeasesReceivableCoveredLoansGross | 213,203,000 wfsl_LoansAndLeasesReceivableCoveredLoansGross
Receivable with imputed interest, discount | $ 28,916,000 us-gaap_ReceivableWithImputedInterestDiscount | $ 34,483,000 us-gaap_ReceivableWithImputedInterestDiscount

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- Definition Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 + Details
Name: | us-gaap_ReceivableWithImputedInterestDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Covered assets include loans and real estate held for sale participating in loss share with the FDIC. + References No definition available. + Details
Name: | wfsl_CoveredAssets
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | wfsl_CoveredAssetsAbstract
Namespace Prefix: | wfsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loans and Leases Receivable, Acquired Loans Classified as Non-Performing + References No definition available. + Details
Name: | wfsl_LoansandLeasesReceivableAcquiredLoansClassifiedasNonPerforming
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Loans and Leases Receivable, Covered Loans, Gross + References No definition available. + Details
Name: | wfsl_LoansAndLeasesReceivableCoveredLoansGross
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant