XML 52 R35.htm IDEA: XBRL DOCUMENT v3.24.2.u1

Business Combination - Summary of Merger-Related Expenses (Details) - Luther Burbank - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2024
Business Acquisition [Line Items]
Merger-related expenses	$ 2,285	$ 27,921
Severance and employee-related
Business Acquisition [Line Items]
Merger-related expenses	1,400	21,666
Legal and Professional
Business Acquisition [Line Items]
Merger-related expenses	505	4,487
Charitable contributions
Business Acquisition [Line Items]
Merger-related expenses	0	1,000
System conversion and integration
Business Acquisition [Line Items]
Merger-related expenses	$ 380	$ 768

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/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

+ Details

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

X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479405/805-10-25-23

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=wfsl_LutherBurbankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis=wfsl_EmployeeSeveranceAndOtherEmployeeRelatedExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis=wfsl_LegalAndProfessionalExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis=wfsl_CharitableContributionExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis=wfsl_SystemConversionAndIntegrationExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: