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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, 2014	Sep. 30, 2013	Mar. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 8,181,174	$ 7,990,545
Nonaccrual loans by portfolio segment	100,198	131,299	149,033
Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,776,787	7,509,967
Grade as percentage of total gross loans	98.70%	98.30%
Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	174,789		246,075
Grade as percentage of total gross loans	1.22%		1.88%
Nonaccrual loans by portfolio segment	100,198	131,299
Grade as a percetage of total gross loans	1.30%	1.70%
Single-Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,462,093	5,373,950
Nonaccrual loans by portfolio segment	81,740	100,460
Single-Family Residential [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,366,847	5,258,688
Grade as percentage of total gross loans	98.50%	98.10%
Single-Family Residential [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	81,740	100,460
Grade as a percetage of total gross loans	1.50%	1.90%
Construction - Speculative [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	135,001	130,778
Nonaccrual loans by portfolio segment	2,132	4,560
Construction - Speculative [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	132,869	126,218
Grade as percentage of total gross loans	98.40%	96.50%
Construction - Speculative [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	2,132	4,560
Grade as a percetage of total gross loans	1.60%	3.50%
Construction - Custom [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	354,279	302,722
Nonaccrual loans by portfolio segment	265	0
Construction - Custom [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	354,014	302,722
Grade as percentage of total gross loans	99.90%	100.00%
Construction - Custom [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	265	0
Grade as a percetage of total gross loans	0.10%	0.00%
Land - Acquisition & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	77,049	81,660
Nonaccrual loans by portfolio segment	2,113	2,903
Land - Acquisition & Development [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	72,042	74,872
Grade as percentage of total gross loans	97.20%	96.30%
Land - Acquisition & Development [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	2,113	2,903
Grade as a percetage of total gross loans	2.80%	3.70%
Land - Consumer Lot Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	116,864	124,984
Nonaccrual loans by portfolio segment	3,007	3,337
Land - Consumer Lot Loans [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	110,616	118,334
Grade as percentage of total gross loans	97.40%	97.30%
Land - Consumer Lot Loans [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	3,007	3,337
Grade as a percetage of total gross loans	2.60%	2.70%
Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	869,635	835,598
Nonaccrual loans by portfolio segment	2,199	6,573
Multi-Family [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	863,898	825,111
Grade as percentage of total gross loans	99.70%	99.20%
Multi-Family [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	2,199	6,573
Grade as a percetage of total gross loans	0.30%	0.80%
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	634,457	625,293
Nonaccrual loans by portfolio segment	7,101	11,736
Commercial Real Estate [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	447,145	389,423
Grade as percentage of total gross loans	98.40%	97.10%
Commercial Real Estate [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	7,101	11,736
Grade as a percetage of total gross loans	1.60%	2.90%
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	351,705	326,450
Nonaccrual loans by portfolio segment	579	477
Commercial & Industrial [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	276,530	256,525
Grade as percentage of total gross loans	99.80%	99.80%
Commercial & Industrial [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	579	477
Grade as a percetage of total gross loans	0.20%	0.20%
HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	131,852	133,631
Nonaccrual loans by portfolio segment	441	263
HELOC [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	112,108	111,923
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	441	263
Grade as a percetage of total gross loans	0.40%	0.20%
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	48,239	55,479
Nonaccrual loans by portfolio segment	621	990
Consumer [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	40,718	46,151
Grade as percentage of total gross loans	98.50%	97.90%
Consumer [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 621	$ 990
Grade as a percetage of total gross loans	1.50%	0.20%

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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=28367877&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 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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