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Fair Value Measurements - Fair Value Measured on Nonrecurring Basis (Details) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2013
Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | $ 0 |
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 0 |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 190,318 |
Estiamte of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 190,318 |
Impaired loans | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 0 | [1]
Impaired loans | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 0 | [1]
Impaired loans | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 87,170 | [1]
Impaired loans | Estiamte of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 87,170 | [1]
Covered REO | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 0 | [2]
Covered REO | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 0 | [2]
Covered REO | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 20,308 | [2]
Covered REO | Estiamte of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 20,308 | [2]
Real estate held for sale | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 0 | [2]
Real estate held for sale | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 0 | [2]
Real estate held for sale | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 82,840 | [2]
Real estate held for sale | Estiamte of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets measured on nonrecurring basis |  |  | 82,840 | [2]
Changes Measurement |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Losses related to impaired loans and real estate held for sale | 5,192 |  | 38,450 |
Changes Measurement | Impaired loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Losses related to impaired loans and real estate held for sale | 366 | [1] | 13,371 | [1]
Changes Measurement | Covered REO |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Losses related to impaired loans and real estate held for sale | 208 | [2] | 811 | [2]
Changes Measurement | Real estate held for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Losses related to impaired loans and real estate held for sale | $ 4,618 | [2] | $ 24,268 | [2]
[1] | The losses represents remeasurements of collateral-dependent loans.
[2] | The losses represents aggregate writedowns and charge-offs on real estate held for sale.

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- 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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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. + References No definition available. + Details
Name: | wfsl_LossRelatedToImpairedLoansAndRealEstateHeldForSaleMeasuredOnNonrecurringBasis
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration