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Covered Assets - FDIC Indemnification Assets (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014
FDIC Indemnification Asset [Roll Forward] |  |
FDIC indemnification asset, beginning balance | $ 36,860 wfsl_FdicLossShareReceivable | $ 64,615 wfsl_FdicLossShareReceivable
Additions | 0 wfsl_AdditionsToFdicIndemnificationAsset | 1,795 wfsl_AdditionsToFdicIndemnificationAsset
Payments made (received) | 430 wfsl_FdicIndemnificationAssetPayments | (2,502)wfsl_FdicIndemnificationAssetPayments
Amortization | (7,074)wfsl_FdicIndemnificationAssetAmortization | (27,850)wfsl_FdicIndemnificationAssetAmortization
Accretion | 140 wfsl_FdicIndemnificationAssetDiscountAccretion | 802 wfsl_FdicIndemnificationAssetDiscountAccretion
FDIC indemnification asset, ending balance | $ 30,356 wfsl_FdicLossShareReceivable | $ 36,860 wfsl_FdicLossShareReceivable

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- Details
Name: | us-gaap_FDICIndemnificationAssetRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition FDIC Indemnification Asset, Additions + References No definition available. + Details
Name: | wfsl_AdditionsToFdicIndemnificationAsset
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

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

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- 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