Loans Receivable And Allowance For Credit Losses (Allowance For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 15,465	$ 14,856
Charge-offs	(400)	(1,041)
Recoveries
Provisions (recovery) for credit losses	540	1,650
Ending Balance	15,605	15,465
Ratio of net charge-offs to average loans outstanding during the quarter	0.01%	0.02%
Ratio of net charge-offs during the quarter to average non-performing assets	1.03%	2.74%
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	12,107	11,710
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,498	3,755
One-To Four-Family Loans - Originated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	4,915	4,458
Charge-offs	(90)	(115)
Recoveries
Provisions (recovery) for credit losses	96	572
Ending Balance	4,921	4,915
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,641	4,580
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	280	335
One-To Four-Family Loans - Purchased [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	9,901	9,912
Charge-offs	(304)	(922)
Recoveries
Provisions (recovery) for credit losses	745	911
Ending Balance	10,342	9,901
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	7,188	6,621
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,154	3,280
One-To Four-Family Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	14,816	14,370
Charge-offs	(394)	(1,037)
Recoveries
Provisions (recovery) for credit losses	841	1,483
Ending Balance	15,263	14,816
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	11,829	11,201
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,434	3,615
Multi-Family And Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	254	272
Recoveries
Provisions (recovery) for credit losses	(171)	(18)
Ending Balance	83	254
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	83	254
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	395	214
Charge-offs	(6)	(4)
Recoveries
Provisions (recovery) for credit losses	(130)	185
Ending Balance	259	395
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	195	255
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 64	$ 140