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Allowance for Losses on Loans Credit Risk Profile Based on Payment Activity (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Sep. 30, 2010
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 8,299,074	$ 8,777,106
Nonaccrual loans by portfolio segment	210,465	245,532
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	6,218,878	6,551,837
Residential Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	6,047,279	6,395,018
Residential Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	1,041
Residential Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	171,599	155,778
Residential Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Residential Portfolio Segment [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	6,092,254	6,428,214
Grade as percentage of total gross assets	98.00%	98.10%
Nonperforming Financing Receivable [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	126,624	123,623
Percentage of Total Gross Loans	2.00%	1.90%
Construction, Speculative [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	140,459	169,712
Nonaccrual loans by portfolio segment	15,383	39,915
Construction, Speculative [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	15,383	39,915
Percentage of Total Gross Loans	11.00%	23.50%
Construction, Speculative [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	56,485	68,984
Construction, Speculative [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	21,035	7,689
Construction, Speculative [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	62,939	93,039
Construction, Speculative [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction, Speculative [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	125,076	129,797
Grade as percentage of total gross assets	89.00%	76.50%
Construction, Custom [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	279,851	256,384
Nonaccrual loans by portfolio segment	635	0
Construction, Custom [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	635	0
Percentage of Total Gross Loans	0.20%	0.00%
Construction, Custom [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	279,851	256,384
Construction, Custom [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction, Custom [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction, Custom [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction, Custom [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	279,216	256,384
Grade as percentage of total gross assets	99.80%	100.00%
Land, Acquisition and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	200,692	307,230
Nonaccrual loans by portfolio segment	37,339	64,883
Land, Acquisition and Development [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	37,339	64,883
Percentage of Total Gross Loans	18.60%	21.10%
Land, Acquisition and Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	44,888	110,088
Land, Acquisition and Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	44,840	9,868
Land, Acquisition and Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	110,964	187,274
Land, Acquisition and Development [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land, Acquisition and Development [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	163,353	242,347
Grade as percentage of total gross assets	81.40%	78.90%
Land, Consumer Lot Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	163,146	186,840
Nonaccrual loans by portfolio segment	8,843	0
Land, Consumer Lot Loans [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	8,843	0
Percentage of Total Gross Loans	5.40%	0.00%
Land, Consumer Lot Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	162,670	186,840
Land, Consumer Lot Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land, Consumer Lot Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	476	0
Land, Consumer Lot Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land, Consumer Lot Loans [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	154,303	186,840
Grade as percentage of total gross assets	94.60%	100.00%
Multi Family Housing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	700,673	697,351
Nonaccrual loans by portfolio segment	7,664	4,931
Multi Family Housing [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	7,664	4,931
Percentage of Total Gross Loans	1.10%	0.70%
Multi Family Housing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	663,582	661,820
Multi Family Housing [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	4,629	2,046
Multi Family Housing [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	32,462	33,485
Multi Family Housing [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Multi Family Housing [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	693,009	692,420
Grade as percentage of total gross assets	98.90%	99.30%
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	303,442	315,915
Nonaccrual loans by portfolio segment	11,380	10,831
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	11,380	10,831
Percentage of Total Gross Loans	3.80%	3.40%
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	264,083	273,001
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	4,125	3,768
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	35,234	39,048
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial Real Estate Portfolio Segment [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	292,062	305,084
Grade as percentage of total gross assets	96.20%	96.60%
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	109,332	83,070
Nonaccrual loans by portfolio segment	1,679	371
Commercial and Industrial Loans [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	1,679	371
Percentage of Total Gross Loans	1.50%	0.40%
Commercial and Industrial Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	104,171	62,699
Commercial and Industrial Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,128	10,436
Commercial and Industrial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,407	9,758
Commercial and Industrial Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	2,245	0
Commercial and Industrial Loans [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	107,653	82,699
Grade as percentage of total gross assets	98.50%	99.60%
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	115,092	116,143
Nonaccrual loans by portfolio segment	481	0
Home Equity Line of Credit [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	481	0
Percentage of Total Gross Loans	0.40%	0.00%
Home Equity Line of Credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	115,092	116,143
Home Equity Line of Credit [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Home Equity Line of Credit [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Home Equity Line of Credit [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Home Equity Line of Credit [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	114,611	116,143
Grade as percentage of total gross assets	99.60%	100.00%
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	67,509	92,624
Nonaccrual loans by portfolio segment	437	977
Consumer Portfolio Segment [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	437	977
Percentage of Total Gross Loans	0.60%	1.10%
Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	66,512	90,497
Consumer Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	528	1,150
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	469	977
Consumer Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Consumer Portfolio Segment [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	67,072	91,647
Grade as percentage of total gross assets	99.40%	98.90%
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,804,613	8,221,474
Grade as percentage of total gross assets	94.10%	93.70%
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	76,285	35,998
Grade as percentage of total gross assets	0.90%	0.40%
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	415,550	519,359
Grade as percentage of total gross assets	5.00%	5.90%
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	2,245	0
Grade as percentage of total gross assets	0.00%	0.00%
Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	8,088,609	8,531,575
Grade as percentage of total gross assets	97.50%	97.20%
Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	370,294
Grade as percentage of total gross assets	2.76%	3.22%
Nonaccrual loans by portfolio segment	$ 210,465	$ 245,531
Percentage of Total Gross Loans	2.50%	2.80%

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-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 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

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- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph g

-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 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5111-111524

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- Definition

Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans.

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Grade as Percentage of Total Gross Loans

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