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Covered Assets - FDIC Indemnification Asset (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Sep. 30, 2014
FDIC Indemnification Asset Movement Analysis [Roll Forward] |  |
Balance at beginning of period | $ 36,860 | $ 64,615
Additions and deletions | (1,795) | 1,795
Payments made (received) | 714 | (2,502)
Amortization | (17,418) | (27,850)
Accretion | 422 | 802
Balance at end of period | $ 18,783 | $ 36,860

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- Definition FDIC Indemnification Asset, Additions (deletions) + References No definition available. + Details
Name: | wfsl_AdditionsdeletionstoFDICIndemnificationAsset
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition FDIC Indemnification Asset, Payments Made (Received) + References No definition available. + Details
Name: | wfsl_FDICIndemnificationAssetPaymentsMadeReceived
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition FDIC Indemnification Asset, Amortization + References No definition available. + Details
Name: | wfsl_FdicIndemnificationAssetAmortization
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition FDIC Indemnification Asset, Discount Accretion + References No definition available. + Details
Name: | wfsl_FdicIndemnificationAssetDiscountAccretion
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition FDIC Indemnification Asset Movement Analysis [Roll Forward] + References No definition available. + Details
Name: | wfsl_FdicIndemnificationAssetMovementAnalysisRollForward
Namespace Prefix: | wfsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net present value of the amount expected to be received from the FDIC in connection with loss share agreements. + References No definition available. + Details
Name: | wfsl_FdicLossShareReceivable
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant