Loans Receivable And Allowance For Credit Losses (Allowance For Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 8,398	$ 8,540	$ 9,443
Charge-offs	(302)	(348)	(630)
Recoveries	367	206	477
Provision for credit losses	0	0	(750)
Ending Balance	8,463	8,398	8,540
One- to Four-Family Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	6,095	7,095	8,414
Charge-offs	(264)	(288)	(542)
Recoveries	340	169	451
Provision for credit losses	(432)	(881)	(1,228)
Ending Balance	5,739	6,095	7,095
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	3,173	3,928	4,865
Charge-offs	(136)	(72)	(200)
Recoveries	144	4	77
Provision for credit losses	(228)	(687)	(814)
Ending Balance	2,953	3,173	3,928
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,922	2,102	2,115
Charge-offs	(128)	0	0
Recoveries	0	0	0
Provision for credit losses	67	(180)	(13)
Ending Balance	1,861	1,922	2,102
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,000	1,065	1,434
Charge-offs	0	(216)	(342)
Recoveries	196	165	374
Provision for credit losses	(271)	(14)	(401)
Ending Balance	925	1,000	1,065
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,112	1,208	742
Charge-offs	0	0	0
Recoveries	0	0	0
Provision for credit losses	444	904	466
Ending Balance	2,556	2,112	1,208
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	191	237	287
Charge-offs	(38)	(60)	(88)
Recoveries	27	37	26
Provision for credit losses	(12)	(23)	12
Ending Balance	$ 168	$ 191	$ 237