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Allowance for Losses on Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended			12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Mar. 31, 2013		Mar. 31, 2012	Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	$ 126,827			$ 133,147		$ 157,160	$ 157,160
Charge-offs	(7,774)						(84,579)
Recoveries	3,831						14,857
Provisions & Transfers	0						45,709
Ending Allowance	122,884			122,884			133,147
Provision for loan losses	0		18,000	3,600		29,210
Loans receivable, gross	7,830,112			7,830,112			7,866,336
Nonaccrual loans by portfolio segment	149,033		166,153	149,033		166,153	173,427
Percentage increase (decrease) in nonperforming assets	(10.30%)			(10.30%)
Allowance for credit losses, charge-offs, net of recoveries	3,943		28,721
Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	77,508					83,307	83,307
Charge-offs	(5,140)						(53,789)
Recoveries	2,368						8,164
Provisions & Transfers	2,686						44,133
Ending Allowance	77,422			77,422			81,815
Loans receivable, gross	5,390,743			5,390,743			5,779,264
Nonaccrual loans by portfolio segment	111,572			111,572			131,193
Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	8,660					13,828	13,828
Charge-offs	(68)						(4,916)
Recoveries	146						711
Provisions & Transfers	(981)						2,437
Ending Allowance	7,757			7,757			12,060
Loans receivable, gross	122,544			122,544			131,526
Nonaccrual loans by portfolio segment	7,943			7,943			10,634
Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	275					623	623
Charge-offs	0						0
Recoveries	0						0
Provisions & Transfers	(13)						(276)
Ending Allowance	262			262			347
Loans receivable, gross	217,349			217,349			211,690
Nonaccrual loans by portfolio segment	105			105			539
Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	15,056					32,719	32,719
Charge-offs	(308)						(16,978)
Recoveries	737						1,341
Provisions & Transfers	(3,264)						(1,484)
Ending Allowance	12,221			12,221			15,598
Loans receivable, gross	99,509			99,509			128,379
Nonaccrual loans by portfolio segment	12,177			12,177			13,477
Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	4,963					5,520	5,520
Charge-offs	(574)						(2,670)
Recoveries	0						0
Provisions & Transfers	(448)						2,087
Ending Allowance	3,941			3,941			4,937
Loans receivable, gross	133,875			133,875			141,844
Nonaccrual loans by portfolio segment	3,385			3,385			5,149
Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	5,107					7,623	7,623
Charge-offs	(653)						(1,393)
Recoveries	9						504
Provisions & Transfers	(191)						(1,454)
Ending Allowance	4,272			4,272			5,280
Loans receivable, gross	733,036			733,036			710,741
Nonaccrual loans by portfolio segment	2,802			2,802			4,185
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	2,651					4,331	4,331
Charge-offs	(147)						(814)
Recoveries	10						225
Provisions & Transfers	1,642						(1,786)
Ending Allowance	4,156			4,156			1,956
Loans receivable, gross	642,556			642,556			406,364
Nonaccrual loans by portfolio segment	10,395			10,395			7,653
Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	8,062					5,099	5,099
Charge-offs	(55)						(249)
Recoveries	40						2,366
Provisions & Transfers	581						410
Ending Allowance	8,628			8,628			7,626
Loans receivable, gross	288,944			288,944			166,115
Nonaccrual loans by portfolio segment	210			210			16
HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	1,044					1,139	1,139
Charge-offs	(15)						(232)
Recoveries	0						66
Provisions & Transfers	2						(8)
Ending Allowance	1,031			1,031			965
Loans receivable, gross	137,473			137,473			126,942
Nonaccrual loans by portfolio segment	247			247			198
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Allowance	3,501					2,971	2,971
Charge-offs	(814)						(3,538)
Recoveries	521						1,480
Provisions & Transfers	(14)						1,650
Ending Allowance	3,194			3,194			2,563
Loans receivable, gross	64,083			64,083			63,471
Nonaccrual loans by portfolio segment	197			197			383
Loans Collectively Evaluated for Impairment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	114,039		114,039	114,039		114,039	117,164
Loans receivable, gross	7,203,460	[1]		7,203,460	[1]		7,520,864	[1]
Allowance as a percentage of outstanding loans and leases	1.60%			1.60%			1.60%
Loans Collectively Evaluated for Impairment [Member] | Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	77,422			77,422			81,737
Loans receivable, gross	5,264,505	[1]		5,264,505	[1]		5,694,337	[1]
Allowance as a percentage of outstanding loans and leases	1.50%			1.50%			1.40%
Loans Collectively Evaluated for Impairment [Member] | Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	5,749			5,749			9,079
Loans receivable, gross	99,513	[1]		99,513	[1]		104,312	[1]
Allowance as a percentage of outstanding loans and leases	5.80%			5.80%			8.70%
Loans Collectively Evaluated for Impairment [Member] | Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	262			262			347
Loans receivable, gross	217,036	[1]		217,036	[1]		211,690	[1]
Allowance as a percentage of outstanding loans and leases	0.10%			0.10%			0.20%
Loans Collectively Evaluated for Impairment [Member] | Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	7,331			7,331			6,697
Loans receivable, gross	66,863	[1]		66,863	[1]		47,294	[1]
Allowance as a percentage of outstanding loans and leases	11.00%			11.00%			14.20%
Loans Collectively Evaluated for Impairment [Member] | Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	3,630			3,630			4,176
Loans receivable, gross	115,399	[1]		115,399	[1]		138,666	[1]
Allowance as a percentage of outstanding loans and leases	3.10%			3.10%			3.00%
Loans Collectively Evaluated for Impairment [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	2,892			2,892			2,818
Loans receivable, gross	714,430	[1]		714,430	[1]		694,140	[1]
Allowance as a percentage of outstanding loans and leases	0.40%			0.40%			0.40%
Loans Collectively Evaluated for Impairment [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	3,900			3,900			1,158
Loans receivable, gross	370,717	[1]		370,717	[1]		292,550	[1]
Allowance as a percentage of outstanding loans and leases	1.10%			1.10%			0.40%
Loans Collectively Evaluated for Impairment [Member] | Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	8,628			8,628			7,624
Loans receivable, gross	190,472	[1]		190,472	[1]		161,689	[1]
Allowance as a percentage of outstanding loans and leases	4.50%			4.50%			4.70%
Loans Collectively Evaluated for Impairment [Member] | HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	1,031			1,031			965
Loans receivable, gross	110,570	[1]		110,570	[1]		112,812	[1]
Allowance as a percentage of outstanding loans and leases	0.90%			0.90%			0.90%
Loans Collectively Evaluated for Impairment [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	3,194			3,194			2,563
Loans receivable, gross	53,955	[1]		53,955	[1]		63,374	[1]
Allowance as a percentage of outstanding loans and leases	5.90%			5.90%			4.00%
Loans Individually Evaluated for Impairment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	8,845		29,781	8,845		29,781	15,983
Loans receivable, gross	199,805	[1]		199,805	[1]		234,354	[1]
Allowance as a percentage of outstanding loans and leases	4.40%			4.40%			6.80%
Loans Individually Evaluated for Impairment [Member] | Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0			0			78
Loans receivable, gross	110,471	[1]		110,471	[1]		84,584	[1]
Allowance as a percentage of outstanding loans and leases	0.00%			0.00%			0.10%
Loans Individually Evaluated for Impairment [Member] | Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	2,008			2,008			2,981
Loans receivable, gross	21,104	[1]		21,104	[1]		25,325	[1]
Allowance as a percentage of outstanding loans and leases	9.50%			9.50%			11.80%
Loans Individually Evaluated for Impairment [Member] | Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0			0			0
Loans receivable, gross	0	[1]		0	[1]		0	[1]
Allowance as a percentage of outstanding loans and leases	0.00%			0.00%			0.00%
Loans Individually Evaluated for Impairment [Member] | Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	4,890			4,890			8,901
Loans receivable, gross	26,633	[1]		26,633	[1]		77,383	[1]
Allowance as a percentage of outstanding loans and leases	18.40%			18.40%			11.50%
Loans Individually Evaluated for Impairment [Member] | Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	311			311			761
Loans receivable, gross	14,657	[1]		14,657	[1]		3,178	[1]
Allowance as a percentage of outstanding loans and leases	2.10%			2.10%			23.90%
Loans Individually Evaluated for Impairment [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	1,380			1,380			2,462
Loans receivable, gross	10,892	[1]		10,892	[1]		16,000	[1]
Allowance as a percentage of outstanding loans and leases	12.70%			12.70%			15.40%
Loans Individually Evaluated for Impairment [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	256			256			798
Loans receivable, gross	14,870	[1]		14,870	[1]		26,660	[1]
Allowance as a percentage of outstanding loans and leases	1.70%			1.70%			3.00%
Loans Individually Evaluated for Impairment [Member] | Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0			0			2
Loans receivable, gross	126	[1]		126	[1]		1,134	[1]
Allowance as a percentage of outstanding loans and leases	0.00%			0.00%			0.20%
Loans Individually Evaluated for Impairment [Member] | HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0			0			0
Loans receivable, gross	1,052	[1]		1,052	[1]		90	[1]
Allowance as a percentage of outstanding loans and leases	0.00%			0.00%			0.00%
Loans Individually Evaluated for Impairment [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending Allowance	0			0			0
Loans receivable, gross	0	[1]		0	[1]		0	[1]
Allowance as a percentage of outstanding loans and leases	0.00%			0.00%			0.00%
Nonperforming Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans receivable, gross	246,075		286,248	246,075		286,248
Grade as percentage of total gross loans	1.88%		2.11%	1.88%		2.11%
Nonaccrual loans by portfolio segment	163,116			163,116			173,427
Nonperforming Financing Receivable [Member] | Single-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	108,570			108,570			131,193
Nonperforming Financing Receivable [Member] | Construction - Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	9,471			9,471			10,634
Nonperforming Financing Receivable [Member] | Construction - Custom [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	39			39			539
Nonperforming Financing Receivable [Member] | Land - Acquisition & Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	14,318			14,318			13,477
Nonperforming Financing Receivable [Member] | Land - Consumer Lot Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	4,024			4,024			5,149
Nonperforming Financing Receivable [Member] | Multi-Family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	7,907			7,907			4,185
Nonperforming Financing Receivable [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	16,958			16,958			7,653
Nonperforming Financing Receivable [Member] | Commercial & Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	987			987			16
Nonperforming Financing Receivable [Member] | HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	489			489			198
Nonperforming Financing Receivable [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Nonaccrual loans by portfolio segment	$ 353			$ 353			$ 383
[1] Excludes acquired 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)

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ 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)(4)

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ 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)(3)

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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



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-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



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-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

Provision charged for the period based on estimated losses to be realized from loan and lease transactions.

+ References

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 168, 169, 170

-IssueDate 2006-05-01

-Chapter 5

-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.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9

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- Definition

Allowance as a Percentage of Outstanding Loans and Leases

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- Definition

Reduction to the allowance for credit losses related to financing receivables deemed uncollectible, net of recoveries

+ References

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Financing Receivable, Allowance for Credit Losses, Provision and Transfers

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- Definition

Grade as Percentage of Total Gross Loans

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No definition available.

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Percentage Increase (Decrease) in Nonperforming Assets

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