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Loans Receivable And Allowance For Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Recorded Investment
With no related allowance recorded	$ 3,764	$ 4,250
With an allowance recorded	245	249
Total:	4,009	4,499
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	3,857	4,342
With an allowance recorded	245	249
Total:	4,102	4,591
Related ACL	123	127
Average Recorded Investment
With no related allowance recorded	4,102	4,268
With an allowance recorded	247	249
Total	4,349	4,517
Interest Income Recognized
With no related allowance recorded	213	42	[1]
With an allowance recorded	0	0
Total	213	42
Cash Basis Interest Income Recognized
With no related allowance recorded	172	52
With an allowance recorded	0	0
Total	172	52
One-to four-family
Recorded Investment
With no related allowance recorded	368	383
Total:	368	383
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	412	427
Total:	412	427
Related ACL	0	0
Average Recorded Investment
With no related allowance recorded	378	386
Total	378	386
Interest Income Recognized
With no related allowance recorded	29	7	[1]
Total	29	7
Cash Basis Interest Income Recognized
With no related allowance recorded	29	7
Total	29	7
Commercial real estate
Recorded Investment
With no related allowance recorded	2,973	2,980
Total:	2,973	2,980
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	2,973	2,980
Total:	2,973	2,980
Related ACL	0	0
Average Recorded Investment
With no related allowance recorded	2,987	2,984
Total	2,987	2,984
Interest Income Recognized
With no related allowance recorded	167	33	[1]
Total	167	33
Cash Basis Interest Income Recognized
With no related allowance recorded	129	42
Total	129	42
Land
Recorded Investment
With no related allowance recorded	0	425
Total:	0	425
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	0	425
Total:	0	425
Related ACL	0	0
Average Recorded Investment
With no related allowance recorded	297	438
Total	297	438
Interest Income Recognized
With no related allowance recorded	5	0	[1]
Total	5	0
Cash Basis Interest Income Recognized
With no related allowance recorded	4	0
Total	4	0
Home equity
Recorded Investment
With no related allowance recorded	382	405
Total:	382	405
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	382	405
Total:	382	405
Related ACL	0	0
Average Recorded Investment
With no related allowance recorded	390	400
Total	390	400
Interest Income Recognized
With no related allowance recorded	12	2	[1]
Total	12	2
Cash Basis Interest Income Recognized
With no related allowance recorded	10	3
Total	10	3
Consumer loans, other
Recorded Investment
With no related allowance recorded	0	2
Total:	0	2
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	0	2
Total:	0	2
Related ACL	0	0
Average Recorded Investment
With no related allowance recorded	1	3
Total	1	3
Interest Income Recognized
With no related allowance recorded	0	0
Total	0	0
Cash Basis Interest Income Recognized
With no related allowance recorded	0
With an allowance recorded		0
Total	0	0
Commercial business
Recorded Investment
With no related allowance recorded	41	55
With an allowance recorded	245	249
Total:	286	304
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	90	103
With an allowance recorded	245	249
Total:	335	352
Related ACL	123	127
Average Recorded Investment
With no related allowance recorded	49	57
With an allowance recorded	247	249
Total	296	306
Interest Income Recognized
With no related allowance recorded	0	0	[1]
With an allowance recorded	0	0
Total	0	0
Cash Basis Interest Income Recognized
With no related allowance recorded	0	0
With an allowance recorded	0	0
Total	$ 0	$ 0
[1] For the year ended September 30, 2023

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