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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, 2012	Sep. 30, 2011	Mar. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 8,031,138	$ 8,299,074
Nonaccrual loans by portfolio segment	166,153	210,465	221,736
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,539,322	7,804,613
Grade as percentage of total gross loans	94.50%	94.10%
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	51,760	76,285
Grade as percentage of total gross loans	0.60%	0.90%
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	437,620	415,550
Grade as percentage of total gross loans	4.90%	5.00%
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,900	2,245
Grade as percentage of total gross loans	0.00%	0.00%
Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,730,675	8,088,609
Grade as percentage of total gross loans	97.90%	97.50%
Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	286,248		399,295
Grade as percentage of total gross loans	2.11%		2.98%
Nonaccrual loans by portfolio segment	166,153	210,465
Grade as a percetage of total gross loans	2.10%	2.50%
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,973,633	6,218,878
Nonaccrual loans by portfolio segment	116,284	126,624
Residential Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		6,047,279
Residential Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Residential Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		171,599
Residential Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Residential Portfolio Segment [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,855,256	6,092,254
Grade as percentage of total gross loans	98.10%	98.00%
Residential Portfolio Segment [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	116,284	126,624
Grade as a percetage of total gross loans	1.90%	2.00%
Construction, Speculative [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	128,858	140,459
Nonaccrual loans by portfolio segment	8,190	15,383
Construction, Speculative [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		56,485
Construction, Speculative [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		21,035
Construction, Speculative [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		62,939
Construction, Speculative [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Construction, Speculative [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	120,529	125,076
Grade as percentage of total gross loans	93.60%	89.00%
Construction, Speculative [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	8,190	15,383
Grade as a percetage of total gross loans	6.40%	11.00%
Construction, Custom [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	235,566	279,851
Nonaccrual loans by portfolio segment	539	635
Construction, Custom [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		279,851
Construction, Custom [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Construction, Custom [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Construction, Custom [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Construction, Custom [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	235,027	279,216
Grade as percentage of total gross loans	99.80%	99.80%
Construction, Custom [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	539	635
Grade as a percetage of total gross loans	0.20%	0.20%
Land, Acquisition and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	156,457	200,692
Nonaccrual loans by portfolio segment	25,036	37,339
Land, Acquisition and Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		44,888
Land, Acquisition and Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		44,840
Land, Acquisition and Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		110,964
Land, Acquisition and Development [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Land, Acquisition and Development [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	126,931	163,353
Grade as percentage of total gross loans	83.50%	81.40%
Land, Acquisition and Development [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	25,036	37,339
Grade as a percetage of total gross loans	16.50%	18.60%
Land, Consumer Lot Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	149,967	163,146
Nonaccrual loans by portfolio segment	5,641	8,843
Land, Consumer Lot Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		162,670
Land, Consumer Lot Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Land, Consumer Lot Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		476
Land, Consumer Lot Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Land, Consumer Lot Loans [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	144,326	154,303
Grade as percentage of total gross loans	96.20%	94.60%
Land, Consumer Lot Loans [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	5,641	8,843
Grade as a percetage of total gross loans	3.80%	5.40%
Multi Family Housing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	687,696	700,673
Nonaccrual loans by portfolio segment	4,530	7,664
Multi Family Housing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		663,582
Multi Family Housing [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		4,629
Multi Family Housing [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		32,462
Multi Family Housing [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Multi Family Housing [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	681,937	693,009
Grade as percentage of total gross loans	99.30%	98.90%
Multi Family Housing [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	4,530	7,664
Grade as a percetage of total gross loans	0.70%	1.10%
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	394,488	303,442
Nonaccrual loans by portfolio segment	4,997	11,380
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		264,083
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		4,125
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		35,234
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Commercial Real Estate Portfolio Segment [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	288,237	292,062
Grade as percentage of total gross loans	98.30%	96.20%
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	4,997	11,380
Grade as a percetage of total gross loans	1.70%	3.80%
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	102,684	109,332
Nonaccrual loans by portfolio segment	1	1,679
Commercial and Industrial Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		104,171
Commercial and Industrial Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		1,128
Commercial and Industrial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		1,407
Commercial and Industrial Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		2,245
Commercial and Industrial Loans [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	94,918	107,653
Grade as percentage of total gross loans	100.00%	98.50%
Commercial and Industrial Loans [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	1	1,679
Grade as a percetage of total gross loans	0.00%	1.50%
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	130,583	115,092
Nonaccrual loans by portfolio segment	591	481
Home Equity Line of Credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		115,092
Home Equity Line of Credit [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Home Equity Line of Credit [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Home Equity Line of Credit [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Home Equity Line of Credit [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	112,777	114,611
Grade as percentage of total gross loans	99.50%	99.60%
Home Equity Line of Credit [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	591	481
Grade as a percetage of total gross loans	0.50%	0.40%
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	71,206	67,509
Nonaccrual loans by portfolio segment	344	437
Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		66,512
Consumer Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		528
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		469
Consumer Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Consumer Portfolio Segment [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	70,737	67,072
Grade as percentage of total gross loans	99.50%	99.40%
Consumer Portfolio Segment [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 344	$ 437
Grade as a percetage of total gross loans	0.50%	0.60%

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- Definition

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases.

+ References

Reference 1: 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.



Reference 2: 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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- 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 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.



Reference 2: 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=6965416&loc=d3e5111-111524

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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

+ References

No definition available.

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