XML 33 R24.htm IDEA: XBRL DOCUMENT
v3.22.1

Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Feb. 08, 2021 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) branch | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($)
Accounting Policies [Line Items] |  |  |  |
Number of bank branches | branch |  | 214 |  |
Dividend rate | 4.875% |  |  |
Proceeds from issuance of preferred stock, net |  | $ 0 | $ 293,325 |
Cash collateral |  | 153,000 |  | $ 1,500
Loans in process |  | 2,440,430 |  | 2,232,836
Public Offering |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of depositary shares | shares | 12,000,000 |  |  |
Proceeds from issuance of preferred stock, net | $ 293,325 |  |  |
Public offering price (in usd per share) | $ / shares | $ 25.00 |  |  |
Percentage of preferred stock | 2.50% |  |  |
Public Offering | Series A Preferred Stock |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of depositary shares | shares | 300,000 |  |  |
Financing Receivable |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Loans in process |  | $ 4,295,025 |  | $ 3,804,444

X
- Definition Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),2) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_CashCollateralForBorrowedSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of undisbursed portion of financing receivable balance. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5066-111524 + Details
Name: | us-gaap_FinancingReceivableLoanInProcess
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Accounting Policies + References No definition available. + Details
Name: | wfsl_AccountingPoliciesLineItems
Namespace Prefix: | wfsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of bank branches where the Bank conducts its activities + References No definition available. + Details
Name: | wfsl_NumberOfBankBranches
Namespace Prefix: | wfsl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sale Of Stock, Percentage Of Preferred Stock + References No definition available. + Details
Name: | wfsl_SaleOfStockPercentageOfPreferredStock
Namespace Prefix: | wfsl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=wfsl_PublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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