XML 83 R42.htm IDEA: XBRL DOCUMENT
v3.22.4

Derivatives and Hedging Activities - Impact of Fair Value Hedge Accounting on the Carrying Value of the Hedged Items (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | $ 1,131,282 | $ 1,159,496
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | (35,958) | (39,090)
Loans Receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 1,131,282 | 1,159,496
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | (35,958) | (39,090)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 583,782 | 588,676
Mortgage loan fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | (33,423) | (36,458)
Notional amount | 470,000 |
Mortgage loan fair value hedges | Loans Receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 1,094,211 | 1,119,975
Mortgage loan fair value hedges | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 0 | 0
Commercial loan fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items | (2,535) | (2,632)
Commercial loan fair value hedges | Loans Receivable |  |
Derivatives, Fair Value [Line Items] |  |
Carrying value of hedged items | 37,071 | 39,521
Commercial loan fair value hedges | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | $ 0 | $ 0

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
Name: | us-gaap_HedgedAssetFairValueHedgeCumulativeIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
Name: | us-gaap_HedgedLiabilityFairValueHedge
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_LoansReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=wfsl_MortgageLoanHedgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=wfsl_CommercialLoanHedgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |