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Allowance for Losses on Loans Internally Assigned Grade (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
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] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction, Speculative [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	140,459	169,712
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] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction, Custom [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	279,851	256,384
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] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land, Acquisition and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	200,692	307,230
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] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Land, Consumer Lot Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	163,146	186,840
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] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Multi Family Housing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	700,673	697,351
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] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	303,442	315,915
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] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	98
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	109,332	83,070
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] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	381	177
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	115,092	116,143
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] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	67,509	92,624
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] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
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%
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	381	275
Grade as percentage of total gross assets	0.00%	0.00%
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%

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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X

- 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

Grade as Percentage of Total Gross Loans

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Period Type:	instant