XML 37 R27.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Loans Receivable - Loan Modifications (Details) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2016 USD ($) contract | Dec. 31, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |
Number of contracts (in contracts) | contract | 8 | 6
Recorded investment | $ | $ 2,260 | $ 816
Single-family residential |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts (in contracts) | contract | 6 | 5
Recorded investment | $ | $ 1,993 | $ 668
Land - consumer lot loans |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts (in contracts) | contract | 0 | 1
Recorded investment | $ | $ 0 | $ 148
Commercial real estate |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts (in contracts) | contract | 2 | 0
Recorded investment | $ | $ 267 | $ 0

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_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Modifications, Number of Contracts that Subsequently Defaulted + References No definition available. + Details
Name: | wfsl_FinancingReceivableModificationsNumberOfContractsThatSubsequentlyDefaulted
Namespace Prefix: | wfsl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Modifications, Recorded Investment During the Period + References No definition available. + Details
Name: | wfsl_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
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=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |