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Allowance for Losses on Loans - Additional Information (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reversal of provision for loan losses	$ (5,500,000)us-gaap_ProvisionForLoanAndLeaseLosses	$ (4,600,000)us-gaap_ProvisionForLoanAndLeaseLosses
Transfer to establish a reserve for unfunded commitments			2,910,000us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
Allowance reserve	1,898,000us-gaap_LoansAndLeasesReceivableAllowance
Loans receivable, gross	8,793,428,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount		8,669,717,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Acquired loans subject to general allowance	37,136,000wfsl_AcquiredLoansSubjecttoGeneralAllowance
Loans acquired	0us-gaap_AllowanceForLoanAndLeaseLossesLoansAcquired
Nonaccrual loans by portfolio segment	98,353,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	114,717,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	87,431,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
Percentage decrease in nonperforming assets	14.30%wfsl_PercentageIncreaseDecreaseInNonperformingAssets
Allowance for credit losses, charge-offs, net of recoveries	(841,000)wfsl_FinancingReceivableAllowanceForCreditLossesChargeOffsNetOfRecoveries	(6,017,000)wfsl_FinancingReceivableAllowanceForCreditLossesChargeOffsNetOfRecoveries
Allowance for probable losses	108,700,000us-gaap_FinancingReceivableAllowanceForCreditLosses		112,347,000us-gaap_FinancingReceivableAllowanceForCreditLosses	116,741,000us-gaap_FinancingReceivableAllowanceForCreditLosses
Loans Collectively Evaluated for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	8,084,922,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansCollectivelyEvaluatedForImpairmentMember		8,316,874,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansCollectivelyEvaluatedForImpairmentMember
Allowance for probable losses	108,700,000us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansCollectivelyEvaluatedForImpairmentMember		112,287,000us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansCollectivelyEvaluatedForImpairmentMember
Loans Individually Evaluated for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	119,840,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansIndividuallyEvaluatedForImpairmentMember		134,736,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansIndividuallyEvaluatedForImpairmentMember
Allowance for probable losses	0us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansIndividuallyEvaluatedForImpairmentMember		60,000us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_LoansIndividuallyEvaluatedForImpairmentMember
Nonperforming Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	164,317,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember	197,910,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Grade as percentage of total gross loans	1.13%wfsl_GradeAsPercentageOfTotalGrossLoans / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember	1.37%wfsl_GradeAsPercentageOfTotalGrossLoans / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Nonaccrual loans by portfolio segment	$ 98,353,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember		$ 87,431,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember

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Amount of other addition (reduction) in allowance reserve for credit loss.

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Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios.

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A valuation allowance for financing receivables that are expected to be uncollectible.

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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.

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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.

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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Amount of expense related to estimated loss from loan and lease transactions.

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Acquired Loans Subject to General Allowance

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Reduction to the allowance for credit losses related to financing receivables deemed uncollectible, net of recoveries

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Grade as Percentage of Total Gross Loans

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Percentage Increase (Decrease) in Nonperforming Assets

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