Loans Receivable And Allowance For Credit Losses (Narrative) (Details) (USD $)	3 Months Ended
	Dec. 31, 2011	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of potential loan purchases reviewed for compliance with internal underwriting standards, minimum	25.00%
Loan-to-value ratio for securing multi-family and commercial real estate loans, maximum	80.00%
Other Classified Assets	$ 10,200,000	$ 10,300,000
Financing Receivable, Modifications, Recorded Investment	59,045,000	50,291,000
Recorded Investment	477,000
TDR classified as impaired	44,800,000
TDR not classified as impaired	14,200,000
Financing Receivable Allowance For Credit Losses Related To TDR	877,000
Restructurings Due To Financial Difficulties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Recorded Investment	32,587,000	30,667,000
Troubled debt restructurings subsequently defaulted recorded investment returned current	76,000
Loan Endorsement Program [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Recorded Investment	26,458,000	19,624,000
30-89 Days [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	2,400,000
Over 90 Days [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	3,100,000
One-To Four-Family Loans - Purchased [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loss loans not reserved or charged off	34,000
Financing Receivable, Modifications, Recorded Investment	5,998,000	6,155,000
Recorded Investment	401,000
One-To Four-Family Loans - Purchased [Member] | Restructurings Due To Financial Difficulties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 5,998,000	$ 6,155,000