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Covered Assets - FDIC Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Sep. 30, 2014
FDIC Indemnification Asset Movement Analysis [Roll Forward] |  |
Balance at beginning of period | $ 36,860 wfsl_FdicLossShareReceivable | $ 64,615 wfsl_FdicLossShareReceivable
Additions and deletions (1) | (1,795)wfsl_AdditionsToFdicIndemnificationAsset | 1,795 wfsl_AdditionsToFdicIndemnificationAsset
Payments made (received) | 738 wfsl_FdicIndemnificationAssetPayments | (2,502)wfsl_FdicIndemnificationAssetPayments
Amortization | (12,972)wfsl_FdicIndemnificationAssetAmortization | (27,850)wfsl_FdicIndemnificationAssetAmortization
Accretion | 284 wfsl_FdicIndemnificationAssetDiscountAccretion | 802 wfsl_FdicIndemnificationAssetDiscountAccretion
Balance at end of period | $ 23,115 wfsl_FdicLossShareReceivable | $ 36,860 wfsl_FdicLossShareReceivable

X
- 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

X
- 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

X
- 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
- Details
Name: | wfsl_FdicIndemnificationAssetMovementAnalysisRollForward
Namespace Prefix: | wfsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

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