XML 45 R35.htm IDEA: XBRL DOCUMENT v3.8.0.1

Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 289,006	$ 251,274
Unpaid Principal Balance	301,003	289,340
Related Allowance	3,596	4,156
Average Recorded Investment (Year-To-Date)	261,419	274,530
Amount of related allowance included in specific reserves	654	126
Amount of related allowance included in general reserves	2,942	4,030
Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	98,487	43,897
Unpaid Principal Balance	105,236	75,267
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	62,395	40,392
Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	190,519	207,377
Unpaid Principal Balance	195,767	214,073
Related Allowance	3,596	4,156
Average Recorded Investment (Year-To-Date)	199,024	234,138
Single-family residential
Financing Receivable, Impaired [Line Items]
Recorded Investment	186,811	203,266
Unpaid Principal Balance	191,634	210,047
Related Allowance	2,942	4,030
Average Recorded Investment (Year-To-Date)	193,720	224,094
Single-family residential | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	23,936	21,325
Unpaid Principal Balance	25,229	23,880
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	21,889	19,371
Single-family residential | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	162,875	181,941
Unpaid Principal Balance	166,405	186,167
Related Allowance	2,942	4,030
Average Recorded Investment (Year-To-Date)	171,831	204,723
Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,898
Unpaid Principal Balance	5,898
Related Allowance	0
Average Recorded Investment (Year-To-Date)	2,289
Construction | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,898
Unpaid Principal Balance	5,898
Related Allowance	0
Average Recorded Investment (Year-To-Date)	2,289
Construction, custom
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	148
Unpaid Principal Balance	0	165
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	49	231
Construction, custom | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	148
Unpaid Principal Balance	0	165
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	49	231
Land - acquisition & development
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,186	420
Unpaid Principal Balance	2,230	8,298
Related Allowance	0	1
Average Recorded Investment (Year-To-Date)	1,327	752
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,186	330
Unpaid Principal Balance	2,230	8,208
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,297	176
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	0	90
Unpaid Principal Balance	0	90
Related Allowance	0	1
Average Recorded Investment (Year-To-Date)	30	576
Land - consumer lot loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,223	8,157
Unpaid Principal Balance	7,863	8,856
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	7,695	9,407
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	386	208
Unpaid Principal Balance	432	330
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	298	431
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,837	7,949
Unpaid Principal Balance	7,431	8,526
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	7,397	8,976
Multi-family
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,089	632
Unpaid Principal Balance	3,089	3,724
Related Allowance	4	5
Average Recorded Investment (Year-To-Date)	1,484	1,772
Multi-family | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,616	139
Unpaid Principal Balance	2,616	3,231
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,002	748
Multi-family | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	473	493
Unpaid Principal Balance	473	493
Related Allowance	4	5
Average Recorded Investment (Year-To-Date)	482	1,024
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment	45,090	27,969
Unpaid Principal Balance	51,045	39,194
Related Allowance	104	120
Average Recorded Investment (Year-To-Date)	33,781	28,457
Commercial real estate | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	33,272	12,890
Unpaid Principal Balance	38,372	22,487
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	20,845	11,466
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,818	15,079
Unpaid Principal Balance	12,673	16,707
Related Allowance	104	120
Average Recorded Investment (Year-To-Date)	12,936	16,991
Commercial & industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment	36,888	8,279
Unpaid Principal Balance	36,995	14,321
Related Allowance	546	0
Average Recorded Investment (Year-To-Date)	18,954	7,722
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	29,882	8,279
Unpaid Principal Balance	29,989	14,321
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	14,200	7,425
Commercial & industrial | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,006	0
Unpaid Principal Balance	7,006	0
Related Allowance	546	0
Average Recorded Investment (Year-To-Date)	4,754	297
HELOC
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,697	2,218
Unpaid Principal Balance	1,872	3,018
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,964	1,938
HELOC | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	273	490
Unpaid Principal Balance	366	1,212
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	461	487
HELOC | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,424	1,728
Unpaid Principal Balance	1,506	1,806
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	1,503	1,451
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment	124	185
Unpaid Principal Balance	377	1,717
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	156	157
Consumer | Financing Receivable, Impairment, No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	38	88
Unpaid Principal Balance	104	1,433
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	65	57
Consumer | Financing Receivable, Impairment, Allowance Recorded
Financing Receivable, Impaired [Line Items]
Recorded Investment	86	97
Unpaid Principal Balance	273	284
Related Allowance	0	0
Average Recorded Investment (Year-To-Date)	$ 91	$ 100

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

No definition available.

+ Details

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

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

+ Details

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

X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

+ Details

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

X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

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

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=wfsl_FinancingReceivableImpairmentNoRelatedAllowanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=wfsl_FinancingReceivableImpairmentAllowanceRecordedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_HomeEquityMember
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: