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Allowance for Losses on Loans Credit Risk Profile Based on Payment Activity (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 7,866,336,000	$ 8,299,074,000
Nonaccrual loans by portfolio segment	173,427,000	210,465,000
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,468,534,000	7,804,613,000
Grade as percentage of total gross assets	94.90%	94.10%
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	42,988,000	76,285,000
Grade as percentage of total gross assets	0.60%	0.90%
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	352,916,000	415,550,000
Grade as percentage of total gross assets	4.50%	5.00%
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,898,000	2,245,000
Grade as percentage of total gross assets	0.00%	0.00%
Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,581,792,000	8,088,609,000
Grade as percentage of total gross assets	97.80%	97.50%
Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	272,905,000	370,294,000
Nonaccrual loans by portfolio segment	173,427,000	210,465,000
Percentage of Total Gross Loans	2.20%	2.50%
Single-family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,779,264,000	6,218,878,000
Single-family Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		6,047,279,000
Single-family Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Single-family Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		171,599,000
Single-family Residential [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		0
Single-family Residential [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,647,729,000	6,092,254,000
Grade as percentage of total gross assets	97.70%	98.00%
Single-family Residential [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	131,193,000	126,624,000
Percentage of Total Gross Loans	2.30%	2.00%
Construction, Speculative [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	131,526,000	140,459,000
Nonaccrual loans by portfolio segment	10,634,000	15,383,000
Construction, Speculative [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		56,485,000
Construction, Speculative [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		21,035,000
Construction, Speculative [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		62,939,000
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	119,003,000	125,076,000
Grade as percentage of total gross assets	91.80%	89.00%
Construction, Speculative [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	10,634,000	15,383,000
Percentage of Total Gross Loans	8.20%	11.00%
Construction, Custom [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	211,690,000	279,851,000
Nonaccrual loans by portfolio segment	539,000	635,000
Construction, Custom [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		279,851,000
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	211,151,000	279,216,000
Grade as percentage of total gross assets	99.70%	99.80%
Construction, Custom [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	539,000	635,000
Percentage of Total Gross Loans	0.30%	0.20%
Land, Acquisition and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	128,379,000	200,692,000
Nonaccrual loans by portfolio segment	13,477,000	37,339,000
Land, Acquisition and Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		44,888,000
Land, Acquisition and Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		44,840,000
Land, Acquisition and Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		110,964,000
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	111,200,000	163,353,000
Grade as percentage of total gross assets	89.20%	81.40%
Land, Acquisition and Development [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	13,477,000	37,339,000
Percentage of Total Gross Loans	10.80%	18.60%
Land, Consumer Lot Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	141,844,000	163,146,000
Nonaccrual loans by portfolio segment	5,149,000	8,843,000
Land, Consumer Lot Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		162,670,000
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		476,000
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	136,695,000	154,303,000
Grade as percentage of total gross assets	96.40%	94.60%
Land, Consumer Lot Loans [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	5,149,000	8,843,000
Percentage of Total Gross Loans	3.60%	5.40%
Multi Family Housing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	710,741,000	700,673,000
Nonaccrual loans by portfolio segment	4,185,000	7,664,000
Multi Family Housing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		663,582,000
Multi Family Housing [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		4,629,000
Multi Family Housing [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		32,462,000
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	705,955,000	693,009,000
Grade as percentage of total gross assets	99.40%	98.90%
Multi Family Housing [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	4,185,000	7,664,000
Percentage of Total Gross Loans	0.60%	1.10%
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	406,364,000	303,442,000
Nonaccrual loans by portfolio segment	7,653,000	11,380,000
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		264,083,000
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		4,125,000
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		35,234,000
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	311,557,000	292,062,000
Grade as percentage of total gross assets	97.60%	96.20%
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	7,653,000	11,380,000
Percentage of Total Gross Loans	2.40%	3.80%
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	166,115,000	109,332,000
Nonaccrual loans by portfolio segment	16,000	1,679,000
Commercial and Industrial Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		104,171,000
Commercial and Industrial Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		1,128,000
Commercial and Industrial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		1,407,000
Commercial and Industrial Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		2,245,000
Commercial and Industrial Loans [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	162,807,000	107,653,000
Grade as percentage of total gross assets	100.00%	98.50%
Commercial and Industrial Loans [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	16,000	1,679,000
Percentage of Total Gross Loans	0.00%	1.50%
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	126,942,000	115,092,000
Nonaccrual loans by portfolio segment	198,000	481,000
Home Equity Line of Credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		115,092,000
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	112,704,000	114,611,000
Grade as percentage of total gross assets	99.80%	99.60%
Home Equity Line of Credit [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	198,000	481,000
Percentage of Total Gross Loans	0.20%	0.40%
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	63,471,000	67,509,000
Nonaccrual loans by portfolio segment	383,000	437,000
Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		66,512,000
Consumer Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		528,000
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross		469,000
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	62,991,000	67,072,000
Grade as percentage of total gross assets	99.40%	99.40%
Consumer Portfolio Segment [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans by portfolio segment	$ 383,000	$ 437,000
Percentage of Total Gross Loans	0.60%	0.60%

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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



Reference 2: 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.

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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



Reference 2: 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.

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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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