XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Allowance for Losses on Loans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Reversal of loan losses | $ 1,500 | $ 3,949 | $ 1,500 | $ 9,449 |  |  |  |
Charge-offs, net of (recoveries) | (3,518) | (3,123) |  |  |  |  |  |
Loans receivable, gross | 10,306,673 |  | 10,306,673 |  |  | $ 9,823,270 |  |
Nonaccrual of interest | 54,559 |  | 54,559 |  |  | 67,810 |  |
Allowance for probable losses | 109,919 | 108,323 | 109,919 | 108,323 | $ 107,901 | 106,829 | $ 108,700 | $ 114,591
Allowance for credit losses and reserve for unfunded commitments | $ 113,004 |  | $ 113,004 |  |  |  |  |
Allowance for credit losses and reserve for unfunded commitments, percent of gross loans | 1.10% |  | 1.10% |  |  |  |  |
Acquired loans subject to general allowance | $ 24,101 |  | $ 24,101 |  |  |  |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for probable losses | 3,085 |  | 3,085 |  |  | 3,085 |  |
Single-family residential |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual of interest | 42,395 |  | 42,395 |  |  | 59,074 |  |
Allowance for probable losses | 41,828 | $ 54,762 | 41,828 | $ 54,762 | 47,756 | 47,347 | $ 55,495 | $ 62,763
Loans Collectively Evaluated for Impairment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 9,340,515 |  | 9,340,515 |  |  | 8,963,453 |  |
Allowance for probable losses | 108,883 |  | 108,883 |  |  | 106,554 |  |
Loans Collectively Evaluated for Impairment | Single-family residential |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 5,557,463 |  | 5,557,463 |  |  | 5,595,752 |  |
Allowance for probable losses | 40,974 |  | 40,974 |  |  | 47,073 |  |
Loans Individually Evaluated for Impairment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 45,717 |  | 45,717 |  |  | 85,513 |  |
Allowance for probable losses | 1,036 |  | 1,036 |  |  | 275 |  |
Loans Individually Evaluated for Impairment | Single-family residential |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 28,462 |  | 28,462 |  |  | 51,718 |  |
Allowance for probable losses | 854 |  | 854 |  |  | 275 |  |
Non-Performing Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | $ 93,329 |  | $ 93,329 |  | $ 98,846 | $ 128,577 |  |
Ratio of non-performing assets to total assets | 0.64% |  | 0.64% |  | 0.67% | 0.88% |  |
Nonaccrual of interest | $ 54,559 |  | $ 54,559 |  | $ 56,748 | $ 67,810 |  |
Non-Performing Loans | Single-family residential |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual of interest | $ 42,395 |  | $ 42,395 |  |  | $ 59,074 |  |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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=49124121&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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=49124121&loc=d3e5111-111524 + Details
Name: | us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: 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=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
Name: | us-gaap_ProvisionForLoanAndLeaseLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Acquired Loans Subject to General Allowance + References No definition available. + Details
Name: | wfsl_AcquiredLoansSubjecttoGeneralAllowance
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reduction to the allowance for credit losses related to financing receivables deemed uncollectible, net of recoveries + References No definition available. + Details
Name: | wfsl_FinancingReceivableAllowanceForCreditLossesChargeOffsNetOfRecoveries
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Loans and Leases Receivable, Allowance for Credit Losses and Reserve for Unfunded Commitments + References No definition available. + Details
Name: | wfsl_LoansandLeasesReceivableAllowanceforCreditLossesandReserveforUnfundedCommitments
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans and Leases Receivable, Allowance for Credit Losses and Reserve for Unfunded Commitments, Percent of Gross Loans + References No definition available. + Details
Name: | wfsl_LoansandLeasesReceivableAllowanceforCreditLossesandReserveforUnfundedCommitmentsPercentofGrossLoans
Namespace Prefix: | wfsl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of Non-Performing Assets to Total Assets + References No definition available. + Details
Name: | wfsl_RatioOfNonPerformingAssetsToTotalAssets
Namespace Prefix: | wfsl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=wfsl_LoansCollectivelyEvaluatedForImpairmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=wfsl_LoansIndividuallyEvaluatedForImpairmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |