Loans Receivable And Allowance For Credit Losses (Allowance For Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	$ 19,889	$ 15,312	$ 16,371	$ 19,823
Charge-offs	(11)	(10)	(31)	(30)
Recoveries	1	185	5	250
Provision for credit losses	2,520	796	6,054	(3,760)
Ending Balance	22,399	16,283	22,399	16,283
One- to Four-Family Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	5,434	4,079	5,006	3,978
Charge-offs	0	0	0	(4)
Recoveries	1	126	2	137
Provision for credit losses	40	360	467	454
Ending Balance	5,475	4,565	5,475	4,565
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	2,139	1,709	2,066	1,612
Charge-offs	0	0	0	(4)
Recoveries	1	126	2	137
Provision for credit losses	15	69	87	159
Ending Balance	2,155	1,904	2,155	1,904
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	3,074	2,129	2,734	2,062
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for credit losses	7	308	347	375
Ending Balance	3,081	2,437	3,081	2,437
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	221	241	206	304
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for credit losses	18	(17)	33	(80)
Ending Balance	239	224	239	224
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	14,222	11,031	11,120	15,652
Charge-offs	0	0	0	(10)
Recoveries	0	52	1	101
Provision for credit losses	2,463	407	5,564	(4,253)
Ending Balance	16,685	11,490	16,685	11,490
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	233	202	245	193
Charge-offs	(11)	(10)	(31)	(16)
Recoveries	0	7	2	12
Provision for credit losses	17	29	23	39
Ending Balance	$ 239	$ 228	$ 239	$ 228