Loans Receivable And Allowance For Credit Losses (Allowance For Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	$ 9,226	$ 8,463
Charge-offs	(48)	(56)
Recoveries	32	151
Provision for credit losses	225	0
Ending Balance	9,435	8,558
One- to Four-Family Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	3,890	5,739
Charge-offs	(18)	(46)
Recoveries	0	92
Provision for credit losses	(13)	(440)
Ending Balance	3,859	5,345
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	2,000	2,953
Charge-offs	(18)	(20)
Recoveries	0	3
Provision for credit losses	65	(175)
Ending Balance	2,047	2,761
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	1,203	1,861
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	(3)	(113)
Ending Balance	1,200	1,748
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	687	925
Charge-offs	0	(26)
Recoveries	0	89
Provision for credit losses	(75)	(152)
Ending Balance	612	836
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	5,171	2,556
Charge-offs	(24)	0
Recoveries	27	2
Provision for credit losses	244	476
Ending Balance	5,418	3,034
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	165	168
Charge-offs	(6)	(10)
Recoveries	5	57
Provision for credit losses	(6)	(36)
Ending Balance	$ 158	$ 179