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Covered Assets Credit Risk Profile by Internally Assigned Grade by Loan Status Designation (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2011 | Sep. 30, 2010
--- | --- | ---
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | $ 495,358 | $ 685,384
Discount balance related to acquired loans | 109,409 | 150,910
Covered loans, allowance for losses | (3,766) | 0
Covered loans, net | 382,183 | 534,474
Single Family Residential [Member] | Pass [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 3,667 |
Single Family Residential [Member] | Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 45,619 |
Construction, Speculative [Member] | Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 1,315 |
Construction, Custom [Member] | Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Land, Acquisition and Development [Member] | Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 8,383 |
Land, Consumer Lot Loans [Member] | Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 543 |
Multi Family Housing [Member] | Pass [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Multi Family Housing [Member] | Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 32,448 |
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 418 |
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 118,124 |
Commercial and Industrial Loans [Member] | Pass [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 2,859 |
Commercial and Industrial Loans [Member] | Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 13,717 |
Home Equity Line of Credit [Member] | Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 21,730 |
Consumer Portfolio Segment [Member] | Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 1,199 |
Construction, Speculative and Land, Acquisition and Development [Member] | Pass [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 9,982 |
Pass [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross assets | 94.10% | 93.70%
Pass [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 20,470 |
Pass [Member] | Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 3,544 |
Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 243,078 |
Grade as percentage of total gross assets | 83.10% |
Single Family Residential [Member] | Special Mention [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Single Family Residential [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Speculative [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Custom [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Land, Acquisition and Development [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 6,315 |
Land, Consumer Lot Loans [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Multi Family Housing [Member] | Special Mention [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Multi Family Housing [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 30,579 |
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 1,361 |
Commercial and Industrial Loans [Member] | Special Mention [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 2,725 |
Commercial and Industrial Loans [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 4,481 |
Home Equity Line of Credit [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Consumer Portfolio Segment [Member] | Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Speculative and Land, Acquisition and Development [Member] | Special Mention [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 2,980 |
Special Mention [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross assets | 0.90% | 0.40%
Special Mention [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 36,284 |
Special Mention [Member] | Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 12,157 |
Grade as percentage of total gross assets | 4.20% |
Single Family Residential [Member] | Substandard [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 8,263 |
Single Family Residential [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 595 |
Construction, Speculative [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Custom [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Land, Acquisition and Development [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 360 |
Land, Consumer Lot Loans [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 111 |
Multi Family Housing [Member] | Substandard [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 3,324 |
Multi Family Housing [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 2,458 |
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 48,069 |
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 28,979 |
Commercial and Industrial Loans [Member] | Substandard [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 25,662 |
Commercial and Industrial Loans [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 4,239 |
Home Equity Line of Credit [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Consumer Portfolio Segment [Member] | Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Speculative and Land, Acquisition and Development [Member] | Substandard [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 54,682 |
Substandard [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross assets | 5.00% | 5.90%
Substandard [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 145,411 |
Substandard [Member] | Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 5,411 |
Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 36,742 |
Grade as percentage of total gross assets | 12.60% |
Single Family Residential [Member] | Doubtful [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Single Family Residential [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Speculative [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Custom [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Land, Acquisition and Development [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Land, Consumer Lot Loans [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Multi Family Housing [Member] | Doubtful [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Multi Family Housing [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Commercial and Industrial Loans [Member] | Doubtful [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 772 |
Commercial and Industrial Loans [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 444 |
Home Equity Line of Credit [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Consumer Portfolio Segment [Member] | Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Speculative and Land, Acquisition and Development [Member] | Doubtful [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross assets | 0.00% | 0.00%
Doubtful [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 772 |
Doubtful [Member] | Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 444 |
Grade as percentage of total gross assets | 0.20% |
Single Family Residential [Member] | Loss [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Single Family Residential [Member] | Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Speculative [Member] | Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Custom [Member] | Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Land, Acquisition and Development [Member] | Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Land, Consumer Lot Loans [Member] | Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Multi Family Housing [Member] | Loss [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Multi Family Housing [Member] | Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Commercial Real Estate Portfolio Segment [Member] | Loss [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Commercial Real Estate Portfolio Segment [Member] | Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Commercial and Industrial Loans [Member] | Loss [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Commercial and Industrial Loans [Member] | Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Home Equity Line of Credit [Member] | Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Consumer Portfolio Segment [Member] | Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Construction, Speculative and Land, Acquisition and Development [Member] | Loss [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross assets | 0.00% | 0.00%
Loss [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss [Member] | Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Grade as percentage of total gross assets | 0.00% |
Single Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 11,930 |
Single Family Residential [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 46,214 |
Construction, Speculative [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 1,315 |
Construction, Custom [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Land, Acquisition and Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 15,058 |
Land, Consumer Lot Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 654 |
Multi Family Housing [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 3,324 |
Multi Family Housing [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 34,906 |
Commercial Real Estate Portfolio Segment [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 79,066 |
Commercial Real Estate Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 148,464 |
Commercial and Industrial Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 32,018 |
Commercial and Industrial Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 22,881 |
Home Equity Line of Credit [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 21,730 |
Consumer Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 1,199 |
Construction, Speculative and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 67,644 |
Acquired Impaired Assets [Member] | Home Equity Line of Credit and Other Consumer Loans [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 8,955 |
Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 292,421 | 378,552
Covered loans, allowance for losses | 0 | 0
Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 202,937 | 306,832
Covered loans, allowance for losses | $ (3,766) | $ 0

X
- Definition Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 + Details
Name: | us-gaap_ReceivableWithImputedInterestDiscount
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Covered Assets, Loan Status Designation [Line Items] + Details
Name: | wfsl_CoveredAssetsLoanStatusDesignationLineItems
Namespace Prefix: | wfsl
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Covered Loans, Allowance for Losses + Details
Name: | wfsl_CoveredLoansAllowanceForLosses
Namespace Prefix: | wfsl
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Grade as Percentage of Total Gross Loans + Details
Name: | wfsl_GradeAsPercentageOfTotalGrossLoans
Namespace Prefix: | wfsl
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans and Leases Receivable, Covered Loans, Gross + Details
Name: | wfsl_LoansAndLeasesReceivableCoveredLoansGross
Namespace Prefix: | wfsl
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans and Leases Receivable, Covered Loans, Net Reported Amount + Details
Name: | wfsl_LoansAndLeasesReceivableCoveredLoansNetReportedAmount
Namespace Prefix: | wfsl
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant