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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, 2013	Sep. 30, 2012
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 7,990,545	$ 7,866,336
Nonaccrual loans by portfolio segment	131,299	173,427
Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,373,950	5,779,264
Nonaccrual loans by portfolio segment	100,460	131,193
Construction - speculative
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	130,778	131,526
Nonaccrual loans by portfolio segment	4,560	10,634
Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	302,722	211,690
Nonaccrual loans by portfolio segment	0	539
Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	81,660	128,379
Nonaccrual loans by portfolio segment	2,903	13,477
Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	124,984	141,844
Nonaccrual loans by portfolio segment	3,337	5,149
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	835,598	710,741
Nonaccrual loans by portfolio segment	6,573	4,185
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	625,293	406,364
Nonaccrual loans by portfolio segment	11,736	7,653
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	326,450	166,115
Nonaccrual loans by portfolio segment	477	16
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	133,631	126,942
Nonaccrual loans by portfolio segment	263	198
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	55,479	63,471
Nonaccrual loans by portfolio segment	990	383
Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,509,967	7,581,792
Grade as percentage of total gross assets	98.30%	97.80%
Performing Loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,258,688	5,647,729
Grade as percentage of total gross assets	98.10%	97.70%
Performing Loans | Construction - speculative
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	126,218	119,003
Grade as percentage of total gross assets	96.50%	91.80%
Performing Loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	302,722	211,151
Grade as percentage of total gross assets	100.00%	99.70%
Performing Loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	74,872	111,200
Grade as percentage of total gross assets	96.30%	89.20%
Performing Loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	118,334	136,695
Grade as percentage of total gross assets	97.30%	96.40%
Performing Loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	825,111	705,955
Grade as percentage of total gross assets	99.20%	99.40%
Performing Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	389,423	311,557
Grade as percentage of total gross assets	97.10%	97.60%
Performing Loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	256,525	162,807
Grade as percentage of total gross assets	99.80%	100.00%
Performing Loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	111,923	112,704
Grade as percentage of total gross assets	99.80%	99.80%
Performing Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	46,151	62,991
Grade as percentage of total gross assets	97.90%	99.40%
Non-Performing Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	213,616	272,905
Nonaccrual loans by portfolio segment	131,299	173,427
Percentage of Total Gross Loans	1.70%	2.20%
Non-Performing Loans | Single-family residential
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	100,460	131,193
Percentage of Total Gross Loans	1.90%	2.30%
Non-Performing Loans | Construction - speculative
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	4,560	10,634
Percentage of Total Gross Loans	3.50%	8.20%
Non-Performing Loans | Construction - custom
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	0	539
Percentage of Total Gross Loans	0.00%	0.30%
Non-Performing Loans | Land - acquisition & development
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	2,903	13,477
Percentage of Total Gross Loans	3.70%	10.80%
Non-Performing Loans | Land - consumer lot loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	3,337	5,149
Percentage of Total Gross Loans	2.70%	3.60%
Non-Performing Loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	6,573	4,185
Percentage of Total Gross Loans	0.80%	0.60%
Non-Performing Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	11,736	7,653
Percentage of Total Gross Loans	2.90%	2.40%
Non-Performing Loans | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	477	16
Percentage of Total Gross Loans	0.20%	0.00%
Non-Performing Loans | HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	263	198
Percentage of Total Gross Loans	0.20%	0.20%
Non-Performing Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 990	$ 383
Percentage of Total Gross Loans	2.10%	0.60%

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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

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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=28368275&loc=d3e5111-111524

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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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