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v2.4.1.9

Allowance for Losses on Loans - Additional Information (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Reversal of provision for loan losses | $ (3,949,000)us-gaap_ProvisionForLoanAndLeaseLosses | $ (4,336,000)us-gaap_ProvisionForLoanAndLeaseLosses | $ (9,449,000)us-gaap_ProvisionForLoanAndLeaseLosses | $ (8,936,000)us-gaap_ProvisionForLoanAndLeaseLosses |  |  |  |
Adjustments, net |  |  |  |  | 2,910,000 us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet |  |  |
Allowance | 1,898,000 us-gaap_LoansAndLeasesReceivableAllowance |  | 1,898,000 us-gaap_LoansAndLeasesReceivableAllowance |  |  |  |  |
Loans receivable, gross | 9,014,755,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount |  | 9,014,755,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount |  | 8,669,717,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount |  |  |
Acquired loans subject to general allowance | 34,695,000 wfsl_AcquiredLoansSubjecttoGeneralAllowance |  | 34,695,000 wfsl_AcquiredLoansSubjecttoGeneralAllowance |  |  |  |  |
Allowance for loan and lease losses, loans acquired | 449,000 us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired |  |  |  |  |  |  |
Nonaccrual of Interest | 75,850,000 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest |  | 75,850,000 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest |  | 87,431,000 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest |  |  |
Percentage increase (decrease) in nonperforming assets | (13.20%)wfsl_PercentageIncreaseDecreaseInNonperformingAssets |  | (13.20%)wfsl_PercentageIncreaseDecreaseInNonperformingAssets |  |  |  |  |
Charge-offs, net of (recoveries) | (3,123,000)wfsl_FinancingReceivableAllowanceForCreditLossesChargeOffsNetOfRecoveries | (1,523,000)wfsl_FinancingReceivableAllowanceForCreditLossesChargeOffsNetOfRecoveries |  |  |  |  |  |
Allowance for probable losses | 108,323,000 us-gaap_FinancingReceivableAllowanceForCreditLosses | 114,931,000 us-gaap_FinancingReceivableAllowanceForCreditLosses | 108,323,000 us-gaap_FinancingReceivableAllowanceForCreditLosses | 114,931,000 us-gaap_FinancingReceivableAllowanceForCreditLosses | 112,347,000 us-gaap_FinancingReceivableAllowanceForCreditLosses | 108,700,000 us-gaap_FinancingReceivableAllowanceForCreditLosses | 118,158,000 us-gaap_FinancingReceivableAllowanceForCreditLosses | 116,741,000 us-gaap_FinancingReceivableAllowanceForCreditLosses
Loans Collectively Evaluated for Impairment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 8,287,193,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansCollectivelyEvaluatedForImpairmentMember |  | 8,287,193,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansCollectivelyEvaluatedForImpairmentMember |  | 8,316,874,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansCollectivelyEvaluatedForImpairmentMember |  |  |
Allowance for probable losses | 108,323,000 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansCollectivelyEvaluatedForImpairmentMember |  | 108,323,000 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansCollectivelyEvaluatedForImpairmentMember |  | 112,287,000 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansCollectivelyEvaluatedForImpairmentMember |  |  |
Loans Individually Evaluated for Impairment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 96,398,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansIndividuallyEvaluatedForImpairmentMember |  | 96,398,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansIndividuallyEvaluatedForImpairmentMember |  | 134,736,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansIndividuallyEvaluatedForImpairmentMember |  |  |
Allowance for probable losses | 0 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansIndividuallyEvaluatedForImpairmentMember |  | 0 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansIndividuallyEvaluatedForImpairmentMember |  | 60,000 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansIndividuallyEvaluatedForImpairmentMember |  |  |
Nonperforming Financing Receivable [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 143,223,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 143,223,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 147,311,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  |  |
Total grade as a % of total net loans | 0.98%wfsl_GradeAsPercentageOfTotalGrossLoans / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 0.98%wfsl_GradeAsPercentageOfTotalGrossLoans / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 1.00%wfsl_GradeAsPercentageOfTotalGrossLoans / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  |  |
Nonaccrual of Interest | 76,895,000 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 76,895,000 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 87,431,000 us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  |  |
Horizon Bank [Member] | Nonperforming Financing Receivable [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Non-performing assets, including covered assets from acquisition | $ 153,202,000 wfsl_NonPerformingAssetsIncludingCoveredAssetsfromAcquisition / us-gaap_BusinessAcquisitionAxis = wfsl_HorizonBankMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | $ 153,202,000 wfsl_NonPerformingAssetsIncludingCoveredAssetsfromAcquisition / us-gaap_BusinessAcquisitionAxis = wfsl_HorizonBankMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  |  |  |  |
Percent of non-performing assets including covered assets from acquisition to total assets | 1.05%wfsl_PercentofNonPerformingAssetsIncludingCoveredAssetsfromAcquisitiontoTotalAssets / us-gaap_BusinessAcquisitionAxis = wfsl_HorizonBankMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 1.05%wfsl_PercentofNonPerformingAssetsIncludingCoveredAssetsfromAcquisitiontoTotalAssets / us-gaap_BusinessAcquisitionAxis = wfsl_HorizonBankMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  |  |  |  |

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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Acquired Loans Subject to General Allowance + References No definition available. + Details
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- Definition Reduction to the allowance for credit losses related to financing receivables deemed uncollectible, net of recoveries + References No definition available. + Details
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- Definition Grade as Percentage of Total Gross Loans + References No definition available. + Details
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