Loans Receivable And Allowance For Credit Losses (Allowance For Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	$ 23,970	$ 24,634	$ 23,035	$ 23,759
Charge-offs	(29)	(76)	(169)	(101)
Recoveries	4	19	37	43
Provision for credit losses	(1,137)	1,277	(95)	2,133
Ending Balance	22,808	25,854	22,808	25,854
Accounting Standards Update 2022-02 Cumulative Effect, Period of Adoption [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance				20
Balance at October 1, 2023 [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance				23,779
One- to Four-Family Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	3,562	5,060	3,673	5,328
Charge-offs	0	0	(113)	0
Recoveries	2	17	7	25
Provision for credit losses	(32)	(271)	(35)	(565)
Ending Balance	3,532	4,806	3,532	4,806
One- to Four-Family Segment [Member] | Accounting Standards Update 2022-02 Cumulative Effect, Period of Adoption [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance				18
One- to Four-Family Segment [Member] | Balance at October 1, 2023 [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance				5,346
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Charge-offs			0	(60)
Commercial Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	19,005	18,311	17,968	17,076
Charge-offs	0	(50)	0	(60)
Recoveries	0	0	20	0
Provision for credit losses	(2,407)	1,401	(1,390)	2,646
Ending Balance	16,598	19,662	16,598	19,662
Commercial Segment [Member] | Commercial Real Estate [Member] | Accounting Standards Update 2022-02 Cumulative Effect, Period of Adoption [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance				0
Commercial Segment [Member] | Commercial Real Estate [Member] | Balance at October 1, 2023 [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance				17,076
Commercial Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	1,171	1,019	1,186	1,104
Charge-offs	0	0	0	0
Recoveries	1	2	3	3
Provision for credit losses	1,269	113	1,252	25
Ending Balance	2,441	1,134	2,441	1,134
Commercial Segment [Member] | Commercial and Industrial [Member] | Accounting Standards Update 2022-02 Cumulative Effect, Period of Adoption [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance				2
Commercial Segment [Member] | Commercial and Industrial [Member] | Balance at October 1, 2023 [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance				1,106
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	232	244	208	251
Charge-offs	(29)	(26)	(56)	(41)
Recoveries	1	0	7	15
Provision for credit losses	33	34	78	27
Ending Balance	$ 237	$ 252	$ 237	252
Consumer Segment [Member] | Accounting Standards Update 2022-02 Cumulative Effect, Period of Adoption [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance				0
Consumer Segment [Member] | Balance at October 1, 2023 [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance				$ 251