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Fair Value Measurements Fair Value Measured on Nonrecurring Basis (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2011
Change During Period, Fair Value Disclosure [Member] | Real Estate Held for Sale [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Losses related to impaired loans and real estate held for sale | $ 20,244 | [1] | $ 50,788 | [1]
Change During Period, Fair Value Disclosure [Member] | Impaired Loans [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Losses related to impaired loans and real estate held for sale | 1,660 | [2] | 37,550 | [2]
Change During Period, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Losses related to impaired loans and real estate held for sale | 31,656 |  | 98,090 |
Covered Real Estate Owned [Member] | Change During Period, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Losses related to impaired loans and real estate held for sale | 9,752 | [1] | 9,752 | [1]
Real Estate Held for Sale [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 90,914 | [1] | 90,914 | [1]
Real Estate Held for Sale [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 0 | [1] | 0 | [1]
Real Estate Held for Sale [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 0 | [1] | 0 | [1]
Real Estate Held for Sale [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 90,914 | [1] | 90,914 | [1]
Impaired Loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 242,159 | [2] | 242,159 | [2]
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 0 | [2] | 0 | [2]
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 0 | [2] | 0 | [2]
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 242,159 | [2] | 242,159 | [2]
Covered Real Estate Owned [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 24,149 | [1] | 24,149 | [1]
Covered Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 0 | [1] | 0 | [1]
Covered Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 0 | [1] | 0 | [1]
Covered Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 24,149 | [1] | 24,149 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 357,222 |  | 357,222 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis | $ 357,222 |  | $ 357,222 |
[1] | The losses represents aggregate writedowns and charge-offs on real estate held for sale.
[2] | The losses represents remeasurements of collateral dependent loans.

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value adjustments to collateral dependent loans and real estate held for sale are recorded to reflect write-downs of principal balances based on the current appraised or estimated value of the collateral. + Details
Name: | wfsl_LossRelatedToImpairedLoansAndRealEstateHeldForSaleMeasuredOnNonrecurringBasis
Namespace Prefix: | wfsl
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration