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Allowance for Losses on Loans - Loans Collectively and Individually Evaluated for Impairment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	$ 116,741		$ 133,147		$ 157,160
Gross Loans Subject to General/Specific Reserve	7,990,545		7,866,336
Single-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	64,184		81,815		83,307
Gross Loans Subject to General/Specific Reserve	5,373,950		5,779,264
Construction - speculative
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	8,407		12,060		13,828
Gross Loans Subject to General/Specific Reserve	130,778		131,526
Construction - custom
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	882		347		623
Gross Loans Subject to General/Specific Reserve	302,722		211,690
Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	9,165		15,598		32,719
Gross Loans Subject to General/Specific Reserve	81,660		128,379
Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	3,552		4,937		5,520
Gross Loans Subject to General/Specific Reserve	124,984		141,844
Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	3,816		5,280		7,623
Gross Loans Subject to General/Specific Reserve	835,598		710,741
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	5,595		1,956		4,331
Gross Loans Subject to General/Specific Reserve	625,293		406,364
Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	16,614		7,626		5,099
Gross Loans Subject to General/Specific Reserve	326,450		166,115
HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	1,002		965		1,139
Gross Loans Subject to General/Specific Reserve	133,631		126,942
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	3,524		2,563		2,971
Gross Loans Subject to General/Specific Reserve	55,479		63,471
Loans Collectively Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	113,268		117,164
Gross Loans Subject to General/Specific Reserve	7,495,504	[1]	7,520,864	[1]
Ratio	1.50%		1.60%
Loans Collectively Evaluated for Impairment | Single-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	64,184		81,737
Gross Loans Subject to General/Specific Reserve	5,262,159	[1]	5,694,337	[1]
Ratio	1.20%		1.40%
Loans Collectively Evaluated for Impairment | Construction - speculative
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	7,307		9,079
Gross Loans Subject to General/Specific Reserve	115,554	[1]	104,312	[1]
Ratio	6.30%		8.70%
Loans Collectively Evaluated for Impairment | Construction - custom
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	882		347
Gross Loans Subject to General/Specific Reserve	302,722	[1]	211,690	[1]
Ratio	0.30%		0.20%
Loans Collectively Evaluated for Impairment | Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	6,943		6,697
Gross Loans Subject to General/Specific Reserve	67,521	[1]	47,294	[1]
Ratio	10.30%		14.20%
Loans Collectively Evaluated for Impairment | Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	3,506		4,176
Gross Loans Subject to General/Specific Reserve	107,216	[1]	138,666	[1]
Ratio	3.30%		3.00%
Loans Collectively Evaluated for Impairment | Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	3,711		2,818
Gross Loans Subject to General/Specific Reserve	824,279	[1]	694,140	[1]
Ratio	0.50%		0.40%
Loans Collectively Evaluated for Impairment | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	5,595		1,158
Gross Loans Subject to General/Specific Reserve	400,789	[1]	292,550	[1]
Ratio	1.40%		0.40%
Loans Collectively Evaluated for Impairment | Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	16,614		7,624
Gross Loans Subject to General/Specific Reserve	256,954	[1]	161,689	[1]
Ratio	6.50%		4.70%
Loans Collectively Evaluated for Impairment | HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	1,002		965
Gross Loans Subject to General/Specific Reserve	111,169	[1]	112,812	[1]
Ratio	0.90%		0.90%
Loans Collectively Evaluated for Impairment | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	3,524		2,563
Gross Loans Subject to General/Specific Reserve	47,141	[1]	63,374	[1]
Ratio	7.50%		4.00%
Loans Individually Evaluated for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	3,473		15,983
Gross Loans Subject to General/Specific Reserve	159,564	[1]	234,354	[1]
Ratio	2.20%		6.80%
Loans Individually Evaluated for Impairment | Single-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	0		78
Gross Loans Subject to General/Specific Reserve	96,989	[1]	84,584	[1]
Ratio	0.00%		0.10%
Loans Individually Evaluated for Impairment | Construction - speculative
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	1,100		2,981
Gross Loans Subject to General/Specific Reserve	15,224	[1]	25,325	[1]
Ratio	7.20%		11.80%
Loans Individually Evaluated for Impairment | Construction - custom
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	0		0
Gross Loans Subject to General/Specific Reserve	0	[1]	0	[1]
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment | Land - acquisition & development
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	2,222		8,901
Gross Loans Subject to General/Specific Reserve	10,254	[1]	77,383	[1]
Ratio	21.70%		11.50%
Loans Individually Evaluated for Impairment | Land - consumer lot loans
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	46		761
Gross Loans Subject to General/Specific Reserve	14,455	[1]	3,178	[1]
Ratio	0.30%		23.90%
Loans Individually Evaluated for Impairment | Multi-family
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	105		2,462
Gross Loans Subject to General/Specific Reserve	7,405	[1]	16,000	[1]
Ratio	1.40%		15.40%
Loans Individually Evaluated for Impairment | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	0		798
Gross Loans Subject to General/Specific Reserve	14,172	[1]	26,660	[1]
Ratio	0.00%		3.00%
Loans Individually Evaluated for Impairment | Commercial & industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	0		2
Gross Loans Subject to General/Specific Reserve	48	[1]	1,134	[1]
Ratio	0.00%		0.20%
Loans Individually Evaluated for Impairment | HELOC
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	0		0
Gross Loans Subject to General/Specific Reserve	1,017	[1]	90	[1]
Ratio	0.00%		0.00%
Loans Individually Evaluated for Impairment | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
General/Specific Reserve Allocation	0		0
Gross Loans Subject to General/Specific Reserve	$ 0	[1]	$ 0	[1]
Ratio	0.00%		0.00%
[1] Excludes acquired loans with discounts sufficient to absorb potential losses and covered loans

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

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X

- 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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X

- Definition

Allowance as a Percentage of Outstanding Loans and Leases

+ References

No definition available.

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