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Allowance for Losses on Loans (Credit Risk Profile Based on Payment Activity) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 7,768,417	$ 7,866,336
Nonaccrual loans by portfolio segment	148,655	173,427	171,033
Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,215,659	7,581,792
Grade as percentage of total gross loans	98.00%	97.80%
Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	233,403		278,490
Grade as percentage of total gross loans	1.79%		2.07%
Nonaccrual loans by portfolio segment	148,655	173,427
Grade as a percetage of total gross loans	2.00%	2.20%
Single-Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,269,293	5,779,264
Nonaccrual loans by portfolio segment	104,252	131,193
Single-Family Residential [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,149,352	5,647,729
Grade as percentage of total gross loans	98.00%	97.70%
Single-Family Residential [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	104,252	131,193
Grade as a percetage of total gross loans	2.00%	2.30%
Construction - Speculative [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	116,363	131,526
Nonaccrual loans by portfolio segment	3,776	10,634
Construction - Speculative [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	112,587	119,003
Grade as percentage of total gross loans	96.80%	91.80%
Construction - Speculative [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	3,776	10,634
Grade as a percetage of total gross loans	3.20%	8.20%
Construction - Custom [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	237,952	211,690
Nonaccrual loans by portfolio segment	0	539
Construction - Custom [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	237,952	211,151
Grade as percentage of total gross loans	100.00%	99.70%
Construction - Custom [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	0	539
Grade as a percetage of total gross loans	0.00%	0.30%
Land - Acquisition & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	91,452	128,379
Nonaccrual loans by portfolio segment	9,586	13,477
Land - Acquisition & Development [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	75,662	111,200
Grade as percentage of total gross loans	88.80%	89.20%
Land - Acquisition & Development [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	9,586	13,477
Grade as a percetage of total gross loans	11.20%	10.80%
Land - Consumer Lot Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	132,360	141,844
Nonaccrual loans by portfolio segment	3,712	5,149
Land - Consumer Lot Loans [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	125,033	136,695
Grade as percentage of total gross loans	97.10%	96.40%
Land - Consumer Lot Loans [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	3,712	5,149
Grade as a percetage of total gross loans	2.90%	3.60%
Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	749,253	710,741
Nonaccrual loans by portfolio segment	6,653	4,185
Multi-Family [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	735,217	705,955
Grade as percentage of total gross loans	99.10%	99.40%
Multi-Family [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	6,653	4,185
Grade as a percetage of total gross loans	0.90%	0.60%
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	639,373	406,364
Nonaccrual loans by portfolio segment	14,348	7,653
Commercial Real Estate [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	383,782	311,557
Grade as percentage of total gross loans	96.40%	97.60%
Commercial Real Estate [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	14,348	7,653
Grade as a percetage of total gross loans	3.60%	2.40%
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	336,843	166,115
Nonaccrual loans by portfolio segment	5,072	16
Commercial & Industrial [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	234,397	162,807
Grade as percentage of total gross loans	97.90%	100.00%
Commercial & Industrial [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	5,072	16
Grade as a percetage of total gross loans	2.10%	0.00%
HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	134,899	126,942
Nonaccrual loans by portfolio segment	871	198
HELOC [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	110,547	112,704
Grade as percentage of total gross loans	99.20%	99.80%
HELOC [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	871	198
Grade as a percetage of total gross loans	0.80%	0.20%
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	60,629	63,471
Nonaccrual loans by portfolio segment	385	383
Consumer [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	51,130	62,991
Grade as percentage of total gross loans	99.30%	99.40%
Consumer [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 385	$ 383
Grade as a percetage of total gross loans	0.70%	0.60%

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: 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



Reference 2: 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.

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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 FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524



Reference 2: 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.

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- Definition

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

+ References

No definition available.

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Grade as Percentage of Total Gross Loans

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No definition available.

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