Loans Receivable And Allowance For Credit Losses (Impaired Loans By Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Sep. 30, 2011
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 72,458	$ 72,022
Unpaid Principal Balance	72,471	72,048
Related ACL	3,498	3,755
Current Quarter Average Recorded Investment	72,239
Current Quarter Interest Income Recognized	480
One-To Four-Family Loans - Originated [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	51,097	51,007
Unpaid Principal Balance	51,254	51,144
Related ACL	280	335
Current Quarter Average Recorded Investment	51,052
Current Quarter Interest Income Recognized	410
One-To Four-Family Loans - Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	20,103	19,715
Unpaid Principal Balance	19,958	19,602
Related ACL	3,154	3,280
Current Quarter Average Recorded Investment	19,909
Current Quarter Interest Income Recognized	55
Multi-Family And Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	554	563
Unpaid Principal Balance	555	565
Current Quarter Average Recorded Investment	558
Current Quarter Interest Income Recognized	9
Consumer - Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	695	732
Unpaid Principal Balance	695	732
Related ACL	64	140
Current Quarter Average Recorded Investment	713
Current Quarter Interest Income Recognized	6
Consumer - Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	9	5
Unpaid Principal Balance	9	5
Current Quarter Average Recorded Investment	7
With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	57,089	54,821
Unpaid Principal Balance	57,202	54,939
Current Quarter Average Recorded Investment	55,954
Current Quarter Interest Income Recognized	424
With No Related Allowance Recorded [Member] | One-To Four-Family Loans - Originated [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	48,392	47,710
Unpaid Principal Balance	48,541	47,845
Current Quarter Average Recorded Investment	48,051
Current Quarter Interest Income Recognized	385
With No Related Allowance Recorded [Member] | One-To Four-Family Loans - Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,549	6,075
Unpaid Principal Balance	7,512	6,056
Current Quarter Average Recorded Investment	6,812
Current Quarter Interest Income Recognized	25
With No Related Allowance Recorded [Member] | Multi-Family And Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	554	563
Unpaid Principal Balance	555	565
Current Quarter Average Recorded Investment	558
Current Quarter Interest Income Recognized	9
With No Related Allowance Recorded [Member] | Consumer - Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	585	468
Unpaid Principal Balance	585	468
Current Quarter Average Recorded Investment	526
Current Quarter Interest Income Recognized	5
With No Related Allowance Recorded [Member] | Consumer - Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	9	5
Unpaid Principal Balance	9	5
Current Quarter Average Recorded Investment	7
With An Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	15,369	17,201
Unpaid Principal Balance	15,269	17,109
Related ACL	3,498	3,755
Current Quarter Average Recorded Investment	16,285
Current Quarter Interest Income Recognized	56
With An Allowance Recorded [Member] | One-To Four-Family Loans - Originated [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,705	3,297
Unpaid Principal Balance	2,713	3,299
Related ACL	280	335
Current Quarter Average Recorded Investment	3,001
Current Quarter Interest Income Recognized	25
With An Allowance Recorded [Member] | One-To Four-Family Loans - Purchased [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	12,554	13,640
Unpaid Principal Balance	12,446	13,546
Related ACL	3,154	3,280
Current Quarter Average Recorded Investment	13,097
Current Quarter Interest Income Recognized	30
With An Allowance Recorded [Member] | Consumer - Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	110	264
Unpaid Principal Balance	110	264
Related ACL	64	140
Current Quarter Average Recorded Investment	187
Current Quarter Interest Income Recognized	$ 1