XML 50 R40.htm IDEA: XBRL DOCUMENT v3.25.0.1

Loans Receivable - Schedule of Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Financing Receivable, Past Due [Line Items]
Net loans	$ 21,060,501	$ 20,916,354
Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	5,052
Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	54,372
Commercial loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	624
Commercial loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	54,372
Commercial loans | Multi-family | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Multi-family | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	24,701
Commercial loans | Commercial real estate | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Commercial real estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	29,671
Commercial loans | Commercial & industrial | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Commercial & industrial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Construction | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	624
Commercial loans | Construction | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Land - acquisition & development | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Commercial loans | Land - acquisition & development | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	4,428
Consumer loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Construction | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	88
Consumer loans | Construction | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Single-family residential | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	3,825
Consumer loans | Single-family residential | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Land - consumer lot loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Land - consumer lot loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | HELOC | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	515
Consumer loans | HELOC | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Consumer | Residential real estate
Financing Receivable, Past Due [Line Items]
Net loans	0
Consumer loans | Consumer | Commercial real estate
Financing Receivable, Past Due [Line Items]
Net loans	$ 0

X

- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-80

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wfsl_CommercialandIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wfsl_LandAcquisitionAndDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_SingleFamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wfsl_LandConsumerLotLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: