Loans Receivable And Allowance For Credit Losses (Troubled Debt Restructurings On Financing Receivable, Recorded Investment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 59,045	$ 50,291
One-To Four-Family Loans - Originated [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	52,075	43,158
One-To Four-Family Loans - Purchased [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,998	6,155
Multi-Family And Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	554	563
Consumer - Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	416	413
Consumer - Other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2	2
Restructurings Due To Financial Difficulties [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	32,587	30,667
Restructurings Due To Financial Difficulties [Member] | One-To Four-Family Loans - Originated [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	25,617	23,534
Restructurings Due To Financial Difficulties [Member] | One-To Four-Family Loans - Purchased [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,998	6,155
Restructurings Due To Financial Difficulties [Member] | Multi-Family And Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	554	563
Restructurings Due To Financial Difficulties [Member] | Consumer - Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	416	413
Restructurings Due To Financial Difficulties [Member] | Consumer - Other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2	2
Loan Endorsement Program [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	26,458	19,624
Loan Endorsement Program [Member] | One-To Four-Family Loans - Originated [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 26,458	$ 19,624