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

X

- 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

X

- 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

X

- Details

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

X

- 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

X

- 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