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Covered Assets (Credit Risk Profile by Internally Assigned Grade by Loan Status Designation) (Details) (USD $) | Jun. 30, 2012 | Sep. 30, 2011
--- | --- | ---
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans |  | $ 495,358,000
Loans and Leases Receivable, Covered Loans, Gross | 399,768,000 | 495,358,000
Discount balance related to acquired loans | (93,321,000) | (109,409,000)
Covered loans, allowance for losses | (3,766,000) | (3,766,000)
Loans and Leases Receivable, Covered Loans, Net Reported Amount | 302,681,000 | 382,183,000
Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 244,860,000 | 292,421,000
Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 154,908,000 | 202,937,000
Single Family Residential [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 38,742,000 | 46,214,000
Single Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 4,338,000 | 11,930,000
Construction, Speculative [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 1,315,000
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 and Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 13,323,000 | 15,058,000
Land, Consumer Lot Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 503,000 | 654,000
Multi Family Housing [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 32,101,000 | 34,906,000
Multi Family Housing [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 3,019,000 | 3,324,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 125,334,000 | 148,464,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 70,594,000 | 79,066,000
Commercial and Industrial Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 14,577,000 | 22,881,000
Commercial and Industrial Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 17,063,000 | 32,018,000
Home Equity Line of Credit [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 19,307,000 | 21,730,000
Consumer Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 973,000 | 1,199,000
Construction, Speculative and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 55,254,000 | 67,644,000
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 | 4,640,000 | 8,955,000
Pass [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 94.30% | 94.10%
Pass [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 77.60% | 83.10%
Outstanding principal balance of acquired loans | 189,967,000 | 243,078,000
Pass [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 15,646,000 | 20,470,000
Pass [Member] | Single Family Residential [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 34,874,000 | 45,619,000
Pass [Member] | Single Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 379,000 | 3,667,000
Pass [Member] | Construction, Speculative [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 1,315,000
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 and Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 4,623,000 | 8,383,000
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 | 503,000 | 543,000
Pass [Member] | Multi Family Housing [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 29,347,000 | 32,448,000
Pass [Member] | Multi Family Housing [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 93,387,000 | 118,124,000
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 408,000 | 418,000
Pass [Member] | Commercial and Industrial Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 6,953,000 | 13,717,000
Pass [Member] | Commercial and Industrial Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 3,881,000 | 2,859,000
Pass [Member] | Home Equity Line of Credit [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 19,307,000 | 21,730,000
Pass [Member] | Consumer Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 973,000 | 1,199,000
Pass [Member] | Construction, Speculative and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 9,807,000 | 9,982,000
Pass [Member] | 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 | 1,171,000 | 3,544,000
Special Mention [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 0.60% | 0.90%
Special Mention [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 1.90% | 4.20%
Outstanding principal balance of acquired loans | 4,690,000 | 12,157,000
Special Mention [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 38,120,000 | 36,284,000
Special Mention [Member] | Single Family Residential [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Special Mention [Member] | 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] | 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 and Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 2,669,000 | 6,315,000
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 Housing [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 Housing [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 3,019,000 | 0
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 1,104,000 | 1,361,000
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 27,739,000 | 30,579,000
Special Mention [Member] | Commercial and Industrial Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 917,000 | 4,481,000
Special Mention [Member] | Commercial and Industrial Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 1,497,000 | 2,725,000
Special Mention [Member] | Home Equity Line of Credit [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 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 and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 5,865,000 | 2,980,000
Special Mention [Member] | 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
Substandard [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 5.10% | 5.00%
Substandard [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Grade as percentage of total gross loans | 20.50% | 12.60%
Outstanding principal balance of acquired loans | 50,203,000 | 36,742,000
Substandard [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 101,142,000 | 145,411,000
Substandard [Member] | Single Family Residential [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 3,868,000 | 595,000
Substandard [Member] | Single Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 3,959,000 | 8,263,000
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 and Development [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 6,031,000 | 360,000
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 | 111,000
Substandard [Member] | Multi Family Housing [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 2,754,000 | 2,458,000
Substandard [Member] | Multi Family Housing [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 3,324,000
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 30,843,000 | 28,979,000
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 42,447,000 | 48,069,000
Substandard [Member] | Commercial and Industrial Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 6,707,000 | 4,239,000
Substandard [Member] | Commercial and Industrial Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 11,685,000 | 25,662,000
Substandard [Member] | Home Equity Line of Credit [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Substandard [Member] | Consumer Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Substandard [Member] | Construction, Speculative and Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 39,582,000 | 54,682,000
Substandard [Member] | 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 | 3,469,000 | 5,411,000
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] |  |
Grade as percentage of total gross loans | 0.00% | 0.20%
Outstanding principal balance of acquired loans | 0 | 444,000
Doubtful [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 772,000
Doubtful [Member] | Single Family Residential [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | 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] | 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 and 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 Housing [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 Housing [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Commercial Real Estate 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] | Commercial Real Estate Portfolio Segment [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Commercial and Industrial Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 444,000
Doubtful [Member] | Commercial and Industrial Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 772,000
Doubtful [Member] | Home Equity Line of Credit [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Doubtful [Member] | Consumer 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 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] | 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] |  |
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] |  |
Grade as percentage of total gross loans | 0.00% | 0.00%
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Single Family Residential [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | 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] | 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 and 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 Housing [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 Housing [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Commercial Real Estate 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] | Commercial Real Estate Portfolio Segment [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Commercial and Industrial Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Commercial and Industrial Loans [Member] | Acquired Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Home Equity Line of Credit [Member] | Acquired Non Impaired Assets [Member] |  |
Covered Assets, Loan Status Designation [Line Items] |  |
Outstanding principal balance of acquired loans | 0 | 0
Loss [Member] | Consumer 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 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] | 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

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
- Details
Name: | wafd_CoveredAssetsLoanStatusDesignationLineItems
Namespace Prefix: | wafd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Covered Loans, Allowance for Losses + References No definition available. + Details
Name: | wafd_CoveredLoansAllowanceForLosses
Namespace Prefix: | wafd_
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: | wafd_GradeAsPercentageOfTotalGrossLoans
Namespace Prefix: | wafd_
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: | wafd_LoansAndLeasesReceivableCoveredLoans
Namespace Prefix: | wafd_
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: | wafd_LoansAndLeasesReceivableCoveredLoansGross
Namespace Prefix: | wafd_
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: | wafd_LoansAndLeasesReceivableCoveredLoansNetReportedAmount
Namespace Prefix: | wafd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant