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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, 2014 | Sep. 30, 2013
--- | --- | ---
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | $ 213,203 | $ 362,248
Discount balance related to acquired loans | (34,483) | (66,301)
Covered loans, allowance for losses | (2,244) | 0
Covered loans, net | 176,476 | 295,947
Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 100,161 | 166,636
Covered loans, allowance for losses | 0 | 0
Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 113,042 | 195,612
Covered loans, allowance for losses | (2,244) | 0
Single-family residential |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 45,467 | 56,888
Single-family residential | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 23,067 | 28,460
Single-family residential | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 22,400 | 28,428
Construction - speculative |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 181 | 440
Construction - speculative | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 | 0
Construction - speculative | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 181 | 440
Construction - custom |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 | 1,197
Construction - custom | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 | 0
Construction - custom | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 | 1,197
Land - acquisition & development |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 6,953 | 22,763
Land - acquisition & development | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 1,364 | 4,810
Land - acquisition & development | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 5,589 | 17,953
Land - consumer lot loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 569 | 741
Land - consumer lot loans | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 73 | 245
Land - consumer lot loans | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 496 | 496
Multi-family |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 8,823 | 25,785
Multi-family | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 6,598 | 18,852
Multi-family | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 2,225 | 6,933
Commercial real estate |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 121,209 | 210,604
Commercial real estate | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 51,336 | 89,499
Commercial real estate | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 69,873 | 121,105
Commercial & industrial |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 14,386 | 24,365
Commercial & industrial | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 5,492 | 9,416
Commercial & industrial | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 8,894 | 14,949
HELOC |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 15,062 | 18,619
HELOC | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 11,777 | 14,750
HELOC | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 3,285 | 3,869
Consumer |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 553 | 846
Consumer | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 454 | 604
Consumer | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 99 | 242
Pool 1 - Construction and land A&D | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 20,261 |
Pool 2 - Single-family residential | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 15,964 |
Pool 3 - Multi-family | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 523 |
Pool 4 - HELOC & other consumer | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 3,977 |
Pool 5 - Commercial real estate | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 64,391 |
Pool 6 - Commercial & industrial | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 7,926 |
Pass |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross assets | 97.20% | 95.60%
Pass | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 70,926 |
Grade as percentage of total gross assets | 70.80% |
Pass | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 64,208 |
Pass | Single-family residential | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 21,311 |
Pass | Construction - speculative | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Pass | Construction - custom | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Pass | Land - acquisition & development | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 972 |
Pass | Land - consumer lot loans | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 73 |
Pass | Multi-family | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 6,598 |
Pass | Commercial real estate | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 26,940 |
Pass | Commercial & industrial | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 2,801 |
Pass | HELOC | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 11,777 |
Pass | Consumer | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 454 |
Pass | Pool 1 - Construction and land A&D | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 8,349 |
Pass | Pool 2 - Single-family residential | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 15,585 |
Pass | Pool 3 - Multi-family | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 52 |
Pass | Pool 4 - HELOC & other consumer | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 2,804 |
Pass | Pool 5 - Commercial real estate | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 33,909 |
Pass | Pool 6 - Commercial & industrial | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 3,509 |
Special mention |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross assets | 0.40% | 0.50%
Special mention | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 115 |
Grade as percentage of total gross assets | 0.10% |
Special mention | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 700 |
Special mention | Single-family residential | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Construction - speculative | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Construction - custom | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Land - acquisition & development | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Land - consumer lot loans | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Multi-family | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Commercial real estate | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 115 |
Special mention | Commercial & industrial | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | HELOC | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Consumer | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Pool 1 - Construction and land A&D | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Pool 2 - Single-family residential | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Pool 3 - Multi-family | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Pool 4 - HELOC & other consumer | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Special mention | Pool 5 - Commercial real estate | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 700 |
Special mention | Pool 6 - Commercial & industrial | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Substandard |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross assets | 2.40% | 3.90%
Substandard | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 29,120 |
Grade as percentage of total gross assets | 29.10% |
Substandard | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 47,609 |
Substandard | Single-family residential | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 1,756 |
Substandard | Construction - speculative | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Substandard | Construction - custom | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Substandard | Land - acquisition & development | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 392 |
Substandard | Land - consumer lot loans | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Substandard | Multi-family | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Substandard | Commercial real estate | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 24,281 |
Substandard | Commercial & industrial | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 2,691 |
Substandard | HELOC | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Substandard | Consumer | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Substandard | Pool 1 - Construction and land A&D | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 11,912 |
Substandard | Pool 2 - Single-family residential | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 379 |
Substandard | Pool 3 - Multi-family | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 471 |
Substandard | Pool 4 - HELOC & other consumer | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 1,173 |
Substandard | Pool 5 - Commercial real estate | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 29,782 |
Substandard | Pool 6 - Commercial & industrial | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 3,892 |
Doubtful |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross assets | 0.00% | 0.00%
Doubtful | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Grade as percentage of total gross assets | 0.00% |
Doubtful | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 525 |
Doubtful | Single-family residential | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Construction - speculative | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Construction - custom | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Land - acquisition & development | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Land - consumer lot loans | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Multi-family | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Commercial real estate | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Commercial & industrial | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | HELOC | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Consumer | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Pool 1 - Construction and land A&D | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Pool 2 - Single-family residential | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Pool 3 - Multi-family | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Pool 4 - HELOC & other consumer | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Pool 5 - Commercial real estate | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Doubtful | Pool 6 - Commercial & industrial | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 525 |
Loss |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross assets | 0.00% | 0.00%
Loss | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Grade as percentage of total gross assets | 0.00% |
Loss | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Single-family residential | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Construction - speculative | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Construction - custom | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Land - acquisition & development | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Land - consumer lot loans | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Multi-family | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Commercial real estate | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Commercial & industrial | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | HELOC | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Consumer | Acquired non-impaired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Pool 1 - Construction and land A&D | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Pool 2 - Single-family residential | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Pool 3 - Multi-family | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Pool 4 - HELOC & other consumer | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Pool 5 - Commercial real estate | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | 0 |
Loss | Pool 6 - Commercial & industrial | Credit-impaired acquired loans |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Gross covered loans | $ 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 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
- Details
Name: | wfsl_CoveredAssetsLoanStatusDesignationLineItems
Namespace Prefix: | wfsl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Covered Loans, Allowance for Losses + References No definition available. + 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 + References No definition available. + 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 + References No definition available. + 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 + References No definition available. + Details
Name: | wfsl_LoansAndLeasesReceivableCoveredLoansNetReportedAmount
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant