Loans Receivable And Allowance For Credit Losses (Allowance For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 11,100	$ 15,465
Charge-offs	(866)	(400)
Recoveries	10
Provisions for credit losses	233	540
Ending Balance	10,477	15,605
Ratio of net charge-offs during the period to average loans outstanding during the period	0.02%	0.01%
Ratio of net charge-offs during the period to average non-performing assets during the period	2.29%	1.03%
One-To Four-Family Loans - Originated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	6,074	4,915
Charge-offs	(219)	(90)
Provisions for credit losses	(216)	96
Ending Balance	5,639	4,921
One-To Four-Family Loans - Purchased [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	4,453	9,901
Charge-offs	(532)	(304)
Provisions for credit losses	369	745
Ending Balance	4,290	10,342
One-To Four-Family Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	10,527	14,816
Charge-offs	(751)	(394)
Provisions for credit losses	153	841
Ending Balance	9,929	15,263
Multi-Family And Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	219	254
Provisions for credit losses	(18)	(171)
Ending Balance	201	83
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	354	395
Charge-offs	(115)	(6)
Recoveries	10
Provisions for credit losses	98	(130)
Ending Balance	$ 347	$ 259