Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class, Duration Related Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	$ 24,933	$ 55,954
Average Recorded Investment, Allowance Recorded	45,102	16,285
Average Recorded Investment	70,035	72,239
Interest Income Recognized, No Related Allowance	98	424
Interest Income Recognized, Allowance Recorded	456	56
Interest Income Recognized	554	480
One-To Four-Family Loans - Originated [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	8,935	48,051
Average Recorded Investment, Allowance Recorded	42,421	3,001
Average Recorded Investment	51,356	51,052
Interest Income Recognized, No Related Allowance	46	385
Interest Income Recognized, Allowance Recorded	433	25
Interest Income Recognized	479	410
One-To Four-Family Loans - Purchased [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	15,267	6,812
Average Recorded Investment, Allowance Recorded	2,191	13,097
Average Recorded Investment	17,458	19,909
Interest Income Recognized, No Related Allowance	46	25
Interest Income Recognized, Allowance Recorded	17	30
Interest Income Recognized	63	55
Multi-Family And Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance		558
Average Recorded Investment, Allowance Recorded	40
Average Recorded Investment	40	558
Interest Income Recognized, No Related Allowance		9
Interest Income Recognized, Allowance Recorded	1
Interest Income Recognized	1	9
Consumer - Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	695	526
Average Recorded Investment, Allowance Recorded	423	187
Average Recorded Investment	1,118	713
Interest Income Recognized, No Related Allowance	6	5
Interest Income Recognized, Allowance Recorded	5	1
Interest Income Recognized	11	6
Consumer - Other [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, No Related Allowance	36	7
Average Recorded Investment, Allowance Recorded	27
Average Recorded Investment	$ 63	$ 7

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524

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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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- Definition

Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

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- Definition

Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

+ References

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Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

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- Definition

Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

+ Details

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