XML 74 R50.htm IDEA: XBRL DOCUMENT
v3.19.3

Loans Receivable - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Ratio of total past due loans to total loans | 0.29% | 0.42%
Approximate rate reduction concession, minimum | 1.00% |
Approximate rate reduction concession, maximum | 2.00% |
TDRs included in impaired loans | $ 121,677 | $ 156,858
Percent of restructured loans performing | 95.90% |
Single family residential loans as percentage of restructured loans | 92.00% |
Loans Receivable from Related Party Including Unfunded Loan Commitment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans granted to officers, directors, and related interests | $ 76,288 | $ 70,012
Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Term for payment and rate reduction | 6 months |
Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Term for payment and rate reduction | 12 months |

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 Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Impaired, Troubled Debt Restructuring, Percent of Restructured Loans Performing + References No definition available. + Details
Name: | wfsl_FinancingReceivableImpairedTroubledDebtRestructuringPercentofRestructuredLoansPerforming
Namespace Prefix: | wfsl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loan Modification, Basis Point Reduction, Maximum + References No definition available. + Details
Name: | wfsl_LoanModificationBasisPointReductionMaximum
Namespace Prefix: | wfsl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loan Modification, Basis Point Reduction, Minimum + References No definition available. + Details
Name: | wfsl_LoanModificationBasisPointReductionMinimum
Namespace Prefix: | wfsl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans and Leases Receivable, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process + References No definition available. + Details
Name: | wfsl_LoansAndLeasesReceivableRatioOfTotalPastDueLoansToTotalLoansReceivableNetOfChargeOffsAndLoansInProcess
Namespace Prefix: | wfsl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Single Family Residential Loans as Percentage of Restructured Loans + References No definition available. + Details
Name: | wfsl_SingleFamilyResidentialLoansAsPercentageOfRestructuredLoans
Namespace Prefix: | wfsl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Term for Payment and Rate Reduction + References No definition available. + Details
Name: | wfsl_TermForPaymentAndRateReduction
Namespace Prefix: | wfsl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=wfsl_LoansReceivablefromRelatedPartyIncludingUnfundedLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |