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Covered Assets - Acquired Impaired and Non-impaired Covered Loans (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Sep. 30, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] |  |
Accretion, carrying amount of loans | $ 284 wfsl_FdicIndemnificationAssetDiscountAccretion | $ 802 wfsl_FdicIndemnificationAssetDiscountAccretion
Acquired Impaired Loans [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] |  |
Balance at beginning of period, accretable yield | 64,534 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | 78,277 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Balance at beginning of period, carrying amount of loans | 78,055 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | 138,091 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Reclassification from nonaccretable balance, net, accretable yield | 6,307 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | 10,186 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Reclassification from nonaccretable balance, net, Carrying Amount of Loans | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesReclassificationsFromNonaccretableDifference / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | (2,069)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesReclassificationsFromNonaccretableDifference / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Accretion, accretable yield | (9,392)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | (23,929)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Accretion, carrying amount of loans | 9,392 wfsl_FdicIndemnificationAssetDiscountAccretion / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | 23,929 wfsl_FdicIndemnificationAssetDiscountAccretion / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Transfers to REO, accretable yield | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldTransfersToRealEstateOwned / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldTransfersToRealEstateOwned / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Transfers to REO, carrying amount of loans | (936)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesTransfersToRealEstateOwned / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | (8,943)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesTransfersToRealEstateOwned / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Payments received, net, accretable yield | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldPayments / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldPayments / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Payments received, net, carrying amount of loans | (11,049)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesPayments / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | (72,953)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesPayments / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Balance at end of period, accretable yield | 61,449 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | 64,534 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Balance at end of period, carrying amount of loans | 75,462 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember | 78,055 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredImpairedLoansMember
Acquired Non Impaired Assets [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] |  |
Balance at beginning of period, accretable yield | 10,259 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | 17,263 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Balance at beginning of period, carrying amount of loans | 98,422 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | 157,856 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Reclassification from nonaccretable balance, net, accretable yield | 0 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | 0 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Reclassification from nonaccretable balance, net, Carrying Amount of Loans | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesReclassificationsFromNonaccretableDifference / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesReclassificationsFromNonaccretableDifference / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Accretion, accretable yield | (4,016)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | (7,004)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Accretion, carrying amount of loans | 4,016 wfsl_FdicIndemnificationAssetDiscountAccretion / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | 7,004 wfsl_FdicIndemnificationAssetDiscountAccretion / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Transfers to REO, accretable yield | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldTransfersToRealEstateOwned / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldTransfersToRealEstateOwned / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Transfers to REO, carrying amount of loans | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesTransfersToRealEstateOwned / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesTransfersToRealEstateOwned / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Payments received, net, accretable yield | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldPayments / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldPayments / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Payments received, net, carrying amount of loans | (40,452)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesPayments / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | (66,438)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesPayments / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Balance at end of period, accretable yield | 6,243 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | 10,259 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember
Balance at end of period, carrying amount of loans | $ 61,986 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember | $ 98,422 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / wfsl_CoveredAssetsStatusOfLoansAcquiredInTransferAxis = wfsl_AcquiredNonImpairedAssetsMember

X
- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of decrease from accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Details
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Balance Type: | na
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X
- Definition Amount of increase of reclassification from nonaccretable difference to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

X
- Definition Certain Loans Acquired in Transfer not Accounted for as Debt Securities Accretable Yield, Payments + References No definition available. + Details
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Namespace Prefix: | wfsl_
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Balance Type: | credit
Period Type: | duration

X
- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Transfers to Real Estate Owned + References No definition available. + Details
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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Payments + References No definition available. + Details
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Namespace Prefix: | wfsl_
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Balance Type: | credit
Period Type: | duration

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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Reclassifications from Nonaccretable Difference + References No definition available. + Details
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Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Transfers to Real Estate Owned + References No definition available. + Details
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Namespace Prefix: | wfsl_
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Balance Type: | credit
Period Type: | duration

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

X
- Details
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Namespace Prefix: |
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X
- Details
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