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v2.4.1.9

Loans Receivable (excluding Covered Loans) - Changes in the Accretable Yield for Acquired Loans (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | 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 | $ 140 wfsl_FdicIndemnificationAssetDiscountAccretion | $ 802 wfsl_FdicIndemnificationAssetDiscountAccretion
Credit Impaired Acquired 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 | 32,591 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember | 37,236 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Balance at beginning of period, carrying amount of loans | 57,771 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember | 69,718 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Reclassification from nonaccretable balance, net, accretable yield |  | 7,300 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Reclassification from nonaccretable balance, net, carrying value of loans |  | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountOfLoansReclassificationsFromNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Accretion, accretable yield | (2,970)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember | (11,945)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Accretion, carrying amount of loans | 2,970 wfsl_FdicIndemnificationAssetDiscountAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember | 11,945 wfsl_FdicIndemnificationAssetDiscountAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Transfers to REO, accretable yield |  | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldTransfersToRealEstateOwned / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Transfers to REO, carrying amount of loans |  | (1,188)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesTransfersToRealEstateOwned / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Payments received, net, accretable yield | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldPayments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldPayments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Payments received, net, carrying amount of loans | (6,455)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesPayments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember | (22,704)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesPayments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Balance at end of period, accretable yield | 29,621 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember | 32,591 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Balance at end of period, carrying amount of loans | 54,286 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember | 57,771 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_CreditImpairedAcquiredLoansMember
Acquired Non-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 | 4,254 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember | 4,977 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Balance at beginning of period, carrying amount of loans | 177,440 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember | 245,373 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Reclassification from nonaccretable balance, net, accretable yield |  | 0 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Reclassification from nonaccretable balance, net, carrying value of loans |  | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountOfLoansReclassificationsFromNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Accretion, accretable yield | (1,424)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember | (723)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Accretion, carrying amount of loans | 1,424 wfsl_FdicIndemnificationAssetDiscountAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember | 723 wfsl_FdicIndemnificationAssetDiscountAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Transfers to REO, accretable yield |  | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldTransfersToRealEstateOwned / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Transfers to REO, carrying amount of loans |  | (4,710)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesTransfersToRealEstateOwned / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Payments received, net, accretable yield | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldPayments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember | 0 wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldPayments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Payments received, net, carrying amount of loans | (1,193)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesPayments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember | (63,946)wfsl_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesPayments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Balance at end of period, accretable yield | 2,830 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember | 4,254 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember
Balance at end of period, carrying amount of loans | $ 177,671 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember | $ 177,440 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = wfsl_AcquiredNonImpairedLoansMember

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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- 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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- 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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- 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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- Definition Certain Loans Acquired in Transfer not Accounted for as Debt Securities Accretable Yield, Payments + References No definition available. + Details
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- 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, Carrying Amount of Loans, Reclassifications from Nonaccretable Difference + References No definition available. + Details
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- 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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- Definition FDIC Indemnification Asset, Discount Accretion + References No definition available. + Details
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