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Covered Assets - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014
Covered Assets [Line Items] |  |  |
Covered assets | $ 81,745 | $ 81,745 | $ 200,558
Covered loans, gross | 81,164 | 81,164 | 213,203
Discount | 3,853 | 3,853 | 34,483
Covered loans, allowance for losses | 0 | $ 0 | $ 2,244
Single-Family Residential [Member] |  |  |
Covered Assets [Line Items] |  |  |
Remaining term |  | 5 years |
Horizon Bank [Member] |  |  |
Covered Assets [Line Items] |  |  |
FDIC loss share coverage expired | 47,774 |  |
Home Valley Bank [Member] |  |  |
Covered Assets [Line Items] |  |  |
Covered assets | $ 38,712 | $ 38,712 |

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
- Definition [Line Items] for Covered Assets [Table] + References No definition available. + Details
Name: | wfsl_CoveredAssetsLineItems
Namespace Prefix: | wfsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Covered Loans, Allowance for Losses + References No definition available. + Details
Name: | wfsl_CoveredLoansAllowanceForLosses
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition FDIC Loss Share Coverage, Expired + References No definition available. + Details
Name: | wfsl_FDICLossShareCoverageExpired
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition FDIC Loss Share Coverage, Remaining Term + References No definition available. + Details
Name: | wfsl_FDICLossShareCoverageRemainingTerm
Namespace Prefix: | wfsl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=wfsl_HorizonBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=wfsl_HomeValleyBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |