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Covered Assets (Credit Risk Profile by Internally Assigned Grade by Loan Status Designation) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Sep. 30, 2013
--- | --- | ---
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | $ 212,002 | $ 300,610
Loans and Leases Receivable, Covered Loans, Gross | 251,520 | 362,248
Discount balance related to acquired loans | (42,244) | (66,301)
Covered loans, allowance for losses | (2,069) | 0
Loans and Leases Receivable, Covered Loans, Net Reported Amount | 207,207 | 295,947
Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 124,687 | 166,636
Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 126,833 | 195,612
Residential Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 24,468 | 28,460
Construction - Speculative [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Construction - Custom [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Land - Acquisition & Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 1,836 | 4,810
Land - Consumer Lot Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 74 | 245
Multi-Family [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 16,472 | 18,852
Commercial Real Estate [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 63,032 | 89,499
Commercial & Industrial [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 5,579 | 9,416
HELOC [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 12,725 | 14,750
Consumer [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 501 | 604
Pool 1 - Construction and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 27,348 | 44,020
Pool 2 - Single-Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 17,411 | 21,541
Pool 3 - Multi-family [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 890 | 5,231
Pool 4 - Home Equity Line of Credit and Other Consumer Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 4,165 | 5,991
Pool 5 - Commercial Real Estate [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 68,382 | 105,553
Pool 6 - Commercial and Industrial [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 8,637 | 13,276
Pass [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 96.90% | 95.60%
Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 94,266 | 123,606
Grade as percentage of total gross loans | 75.60% | 74.20%
Pass [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 70,130 | 84,903
Pass [Member] | Residential Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 21,812 | 26,426
Pass [Member] | Construction - Speculative [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Pass [Member] | Construction - Custom [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Pass [Member] | Land - Acquisition & Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 1,441 | 3,069
Pass [Member] | Land - Consumer Lot Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 74 | 245
Pass [Member] | Multi-Family [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 16,472 | 17,217
Pass [Member] | Commercial Real Estate [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 38,410 | 56,120
Pass [Member] | Commercial & Industrial [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 2,831 | 5,175
Pass [Member] | HELOC [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 12,725 | 14,750
Pass [Member] | Consumer [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 501 | 604
Pass [Member] | Pool 1 - Construction and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 9,429 | 14,361
Pass [Member] | Pool 2 - Single-Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 16,429 | 21,541
Pass [Member] | Pool 3 - Multi-family [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 54 | 4,131
Pass [Member] | Pool 4 - Home Equity Line of Credit and Other Consumer Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 2,938 | 4,111
Pass [Member] | Pool 5 - Commercial Real Estate [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 36,298 | 36,494
Pass [Member] | Pool 6 - Commercial and Industrial [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 4,982 | 4,265
Special Mention [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 0.70% | 0.50%
Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 136 | 10,754
Grade as percentage of total gross loans | 0.10% | 6.40%
Special Mention [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 707 | 19,613
Special Mention [Member] | Residential Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | Construction - Speculative [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | Construction - Custom [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | Land - Acquisition & Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 1,019
Special Mention [Member] | Land - Consumer Lot Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | Multi-Family [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | Commercial Real Estate [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 136 | 9,235
Special Mention [Member] | Commercial & Industrial [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 500
Special Mention [Member] | HELOC [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | Consumer [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | Pool 1 - Construction and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 4,296
Special Mention [Member] | Pool 2 - Single-Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | Pool 3 - Multi-family [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | Pool 4 - Home Equity Line of Credit and Other Consumer Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | Pool 5 - Commercial Real Estate [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 707 | 15,113
Special Mention [Member] | Pool 6 - Commercial and Industrial [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 204
Substandard [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 2.40% | 3.90%
Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 30,285 | 32,276
Grade as percentage of total gross loans | 24.30% | 19.40%
Substandard [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 55,462 | 91,096
Substandard [Member] | Residential Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 2,656 | 2,034
Substandard [Member] | Construction - Speculative [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Substandard [Member] | Construction - Custom [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Substandard [Member] | Land - Acquisition & Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 395 | 722
Substandard [Member] | Land - Consumer Lot Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Substandard [Member] | Multi-Family [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 1,635
Substandard [Member] | Commercial Real Estate [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 24,486 | 24,144
Substandard [Member] | Commercial & Industrial [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 2,748 | 3,741
Substandard [Member] | HELOC [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Substandard [Member] | Consumer [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Substandard [Member] | Pool 1 - Construction and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 17,919 | 25,363
Substandard [Member] | Pool 2 - Single-Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 982 | 0
Substandard [Member] | Pool 3 - Multi-family [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 836 | 1,100
Substandard [Member] | Pool 4 - Home Equity Line of Credit and Other Consumer Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 1,227 | 1,880
Substandard [Member] | Pool 5 - Commercial Real Estate [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 31,377 | 53,946
Substandard [Member] | Pool 6 - Commercial and Industrial [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 3,121 | 8,807
Doubtful [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 0.00% | 0.00%
Doubtful [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Grade as percentage of total gross loans | 0.00% | 0.00%
Doubtful [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 534 | 0
Doubtful [Member] | Residential Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Construction - Speculative [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Construction - Custom [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Land - Acquisition & Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Land - Consumer Lot Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Multi-Family [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Commercial Real Estate [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Commercial & Industrial [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | HELOC [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Consumer [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Pool 1 - Construction and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Pool 2 - Single-Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Pool 3 - Multi-family [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Pool 4 - Home Equity Line of Credit and Other Consumer Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Pool 5 - Commercial Real Estate [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Pool 6 - Commercial and Industrial [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 534 | 0
Loss [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 0.00% | 0.00%
Loss [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Grade as percentage of total gross loans | 0.00% | 0.00%
Loss [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Residential Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Construction - Speculative [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Construction - Custom [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Land - Acquisition & Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Land - Consumer Lot Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Multi-Family [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Commercial Real Estate [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Commercial & Industrial [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | HELOC [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Consumer [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Pool 1 - Construction and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Pool 2 - Single-Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Pool 3 - Multi-family [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Pool 4 - Home Equity Line of Credit and Other Consumer Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Pool 5 - Commercial Real Estate [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Pool 6 - Commercial and Industrial [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | $ 0 | $ 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_LoansAndLeasesReceivableCoveredLoans
Namespace Prefix: | wfsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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