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Loans Receivable And Allowance For Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024		Jun. 30, 2024	Jun. 30, 2023
Recorded Investment
With no related allowance recorded	$ 3,945		$ 3,945	$ 3,764
With an allowance recorded	245		245	245
Total:	4,190		4,190	4,009
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	4,037		4,037	3,857
With an allowance recorded	245		245	245
Total:	4,282		4,282	4,102
Related ACL	123		123	123
Average Recorded Investment
With no related allowance recorded	4,110	[1]	4,188	4,102
With an allowance recorded	247	[1]	247	247
Total	4,357	[1]	4,435	4,349
Interest Income Recognized
With no related allowance recorded	52	[1]	155	213	[1]
With an allowance recorded	0	[1]	0	0
Total	52	[1]	155	213
Cash Basis Interest Income Recognized
With no related allowance recorded	41	[1]	125	172
With an allowance recorded	0	[1]	0	0
Total	41	[1]	125	172
One-to four-family
Recorded Investment
With no related allowance recorded	373		373	368
Total:	373		373	368
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	417		417	412
Total:	417		417	412
Related ACL	0		0	0
Average Recorded Investment
With no related allowance recorded	376	[1]	381	378
Total	376	[1]	381	378
Interest Income Recognized
With no related allowance recorded	7	[1]	21	29	[1]
Total	7	[1]	21	29
Cash Basis Interest Income Recognized
With no related allowance recorded	7	[1]	21	29
Total	7	[1]	21	29
Commercial real estate
Recorded Investment
With no related allowance recorded	2,988		2,988	2,973
Total:	2,988		2,988	2,973
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	2,988		2,988	2,973
Total:	2,988		2,988	2,973
Related ACL	0		0	0
Average Recorded Investment
With no related allowance recorded	2,894	[1]	2,939	2,987
Total	2,894	[1]	2,939	2,987
Interest Income Recognized
With no related allowance recorded	40	[1]	121	167	[1]
Total	40	[1]	121	167
Cash Basis Interest Income Recognized
With no related allowance recorded	31	[1]	94	129
Total	31	[1]	94	129
Land
Recorded Investment
With no related allowance recorded	150		150	0
Total:	150		150
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	150		150	0
Total:	150		150
Related ACL	0		0
Average Recorded Investment
With no related allowance recorded	305	[1]	371	297
Total	305	[1]	371	297
Interest Income Recognized
With no related allowance recorded	2	[1]	4	5	[1]
Total	2	[1]	4	5
Cash Basis Interest Income Recognized
With no related allowance recorded	1	[1]	3	4
Total	1	[1]	3	4
Home equity
Recorded Investment
With no related allowance recorded	390		390	382
Total:	390		390	382
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	390		390	382
Total:	390		390	382
Related ACL	0		0	0
Average Recorded Investment
With no related allowance recorded	488	[1]	444	390
Total	488	[1]	444	390
Interest Income Recognized
With no related allowance recorded	3	[1]	9	12	[1]
Total	3	[1]	9	12
Cash Basis Interest Income Recognized
With no related allowance recorded	2	[1]	7	10
Total	2	[1]	7	10
Consumer loans, other
Recorded Investment
With no related allowance recorded	0		0	0
Total:	0		0	0
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	48		48	0
Total:	48		48	0
Related ACL	0		0	0
Average Recorded Investment
With no related allowance recorded	1	[1]	2	1
Total	1	[1]	2	1
Interest Income Recognized
With no related allowance recorded	0	[1]	0	0
Total	0	[1]	0	0
Cash Basis Interest Income Recognized
With no related allowance recorded	0	[1]	0
With an allowance recorded				0
Total	0	[1]	0	0
Commercial business
Recorded Investment
With no related allowance recorded	44		44	41
With an allowance recorded	245		245	245
Total:	289		289	286
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	44		44	90
With an allowance recorded	245		245	245
Total:	289		289	335
Related ACL	123		123	123
Average Recorded Investment
With no related allowance recorded	46	[1]	51	49
With an allowance recorded	247		247	247
Total	293	[1]	298	296
Interest Income Recognized
With no related allowance recorded	0	[1]	0	0	[1]
With an allowance recorded	0	[1]	0	0
Total	0	[1]	0	0
Cash Basis Interest Income Recognized
With no related allowance recorded	0	[1]	0	0
With an allowance recorded	0	[1]	0	0
Total	$ 0	[1]	$ 0	$ 0
[1] For the year ended September 30, 2023

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