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Allowance for Losses on Loans (Credit Risk Profile Based on Payment Activity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 7,830,112	$ 7,866,336
Nonaccrual loans by portfolio segment	149,033	173,427	166,153
Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,240,151	7,581,792
Grade as percentage of total gross loans	97.80%	97.80%
Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	246,075		286,248
Grade as percentage of total gross loans	1.88%		2.11%
Nonaccrual loans by portfolio segment	163,116	173,427
Grade as a percetage of total gross loans	2.20%	2.20%
Single-Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,390,743	5,779,264
Nonaccrual loans by portfolio segment	111,572	131,193
Single-Family Residential [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,266,407	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	108,570	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	122,544	131,526
Nonaccrual loans by portfolio segment	7,943	10,634
Construction - Speculative [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	111,146	119,003
Grade as percentage of total gross loans	92.10%	91.80%
Construction - Speculative [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	9,471	10,634
Grade as a percetage of total gross loans	7.90%	8.20%
Construction - Custom [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	217,349	211,690
Nonaccrual loans by portfolio segment	105	539
Construction - Custom [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	216,997	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	39	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	99,509	128,379
Nonaccrual loans by portfolio segment	12,177	13,477
Land - Acquisition & Development [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	79,178	111,200
Grade as percentage of total gross loans	84.70%	89.20%
Land - Acquisition & Development [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	14,318	13,477
Grade as a percetage of total gross loans	15.30%	10.80%
Land - Consumer Lot Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	133,875	141,844
Nonaccrual loans by portfolio segment	3,385	5,149
Land - Consumer Lot Loans [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	126,032	136,695
Grade as percentage of total gross loans	96.90%	96.40%
Land - Consumer Lot Loans [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	4,024	5,149
Grade as a percetage of total gross loans	3.10%	3.60%
Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	733,036	710,741
Nonaccrual loans by portfolio segment	2,802	4,185
Multi-Family [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	717,415	705,955
Grade as percentage of total gross loans	98.90%	99.40%
Multi-Family [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	7,907	4,185
Grade as a percetage of total gross loans	1.10%	0.60%
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	642,556	406,364
Nonaccrual loans by portfolio segment	10,395	7,653
Commercial Real Estate [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	368,629	311,557
Grade as percentage of total gross loans	95.60%	97.60%
Commercial Real Estate [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	16,958	7,653
Grade as a percetage of total gross loans	4.40%	2.40%
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	288,944	166,115
Nonaccrual loans by portfolio segment	210	16
Commercial & Industrial [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	189,611	162,807
Grade as percentage of total gross loans	99.50%	100.00%
Commercial & Industrial [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	987	16
Grade as a percetage of total gross loans	0.50%	0.00%
HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	137,473	126,942
Nonaccrual loans by portfolio segment	247	198
HELOC [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	111,133	112,704
Grade as percentage of total gross loans	99.60%	99.80%
HELOC [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	489	198
Grade as a percetage of total gross loans	0.40%	0.20%
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	64,083	63,471
Nonaccrual loans by portfolio segment	197	383
Consumer [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	53,603	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	$ 353	$ 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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