Loans Receivable And Allowance For Credit Losses (Allowance For Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	$ 23,759	$ 16,371
Charge-offs	(7)	(4)
Recoveries	6	2
Provision for credit losses	400	2,820
Ending Balance	24,178	19,189
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	5,328	5,006
Charge-offs	0	0
Recoveries	5	1
Provision for credit losses	(103)	355
Ending Balance	5,248	5,362
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
One- to Four-Family Segment [Member] | Originated [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	2,149	2,066
Charge-offs	0	0
Recoveries	5	1
Provision for credit losses	(63)	92
Ending Balance	2,094	2,159
One- to Four-Family Segment [Member] | Originated [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	3
One- to Four-Family Segment [Member] | Originated [Member] | Balance at October 1, 2023 [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	2,152
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	2,972	2,734
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	(25)	253
Ending Balance	2,948	2,987
One- to Four-Family Segment [Member] | Correspondent Purchased [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	1
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Balance at October 1, 2023 [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	2,973
One- to Four-Family Segment [Member] | Bulk Purchased [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	207	206
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	(15)	10
Ending Balance	206	216
One- to Four-Family Segment [Member] | Bulk Purchased [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	14
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Balance at October 1, 2023 [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	221
Commercial Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	18,180	11,120
Charge-offs	0	0
Recoveries	1	0
Provision for credit losses	495	2,464
Ending Balance	18,678	13,584
Commercial 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	2
Commercial Segment [Member] | Balance at October 1, 2023 [Member] | Accounting Standards Update 2022-02 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	18,182
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	251	245
Charge-offs	(7)	(4)
Recoveries	0	1
Provision for credit losses	8	1
Ending Balance	252	$ 243
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