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Loans Receivable - FDIC Indemnification Asset (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Sep. 30, 2016
FDIC Indemnification Asset [Roll Forward] |  |
Balance at beginning of period | $ 12,769 | $ 16,275
Payments made (received) | (264) | (1,730)
Amortization | (802) | (2,012)
Accretion | 118 | 236
Balance at end of period | $ 11,821 | $ 12,769

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- Definition Increases to the indemnification asset due to accretion of the loan discount relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetAccretionOfDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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, Cash Payments Received (Made) + References No definition available. + Details
Name: | wfsl_FDICIndemnificationAssetCashPaymentsReceivedMade
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 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