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Acquisitions - Narrative (Details) (Bank of America, National Association [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 branch | May 02, 2014 | Oct. 31, 2013 branch | Dec. 06, 2013 branch
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Business Acquisition [Line Items] |  |  |  |
Number of branches acquired (in branches) | 74 wfsl_BusinessCombinationNumberofBranches |  |  |
Customer accounts |  | $ 1,853,798 wfsl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDepositAccounts |  |
Loans receivable, net |  | 12,881 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables |  |
Property and equipment, net |  | 25,097 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment |  |
Premium on deposits |  | 1.99%wfsl_BusinessCombinationPremiumonDeposits |  |
Cash |  | 1,776,660 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents |  |
Core deposit intangible |  | 11,040 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles |  |
Goodwill |  | $ 31,225 us-gaap_Goodwill |  |
New Mexico [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired (in branches) |  |  | 11 wfsl_BusinessCombinationNumberofBranches / us-gaap_BusinessAcquisitionAxis = wfsl_BankofAmericaNationalAssociationMember / us-gaap_StatementGeographicalAxis = stpr_NM |
Washington, Oregon, and Idaho [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired (in branches) |  |  |  | 40 wfsl_BusinessCombinationNumberofBranches / us-gaap_BusinessAcquisitionAxis = wfsl_BankofAmericaNationalAssociationMember / us-gaap_StatementGeographicalAxis = wfsl_WashingtonOregonandIdahoMember
Arizona and Nevada [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired (in branches) |  | 23 wfsl_BusinessCombinationNumberofBranches / us-gaap_BusinessAcquisitionAxis = wfsl_BankofAmericaNationalAssociationMember / us-gaap_StatementGeographicalAxis = wfsl_ArizonaandNevadaMember |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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