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Loans Receivable And Allowance For Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2021		Jun. 30, 2021	Sep. 30, 2020
Recorded Investment
With no related allowance recorded	$ 4,115		$ 4,115	$ 5,041
With an allowance recorded	294		294	732
Total:	4,409		4,409	5,773
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	4,160		4,160	5,129
With an allowance recorded	294		294	732
Total:	4,454		4,454	5,861
Related Allowance	171		171	41
Average Recorded Investment
With no related allowance recorded	4,497	[1]	4,796	5,251
With an allowance recorded	295	[1]	404	681
Total	4,791	[1]	5,200	5,932
Interest Income Recognized
With no related allowance recorded	49	[1]	173	177	[1]
With an allowance recorded	0	[1]	0	16
Total	49	[1]	173	193
Cash Basis Interest Income Recognized
With no related allowance recorded	42	[1]	143	141
With an allowance recorded	0	[1]	0	8
Total	42	[1]	143	149
Mortgage loans, one-to-four family
Recorded Investment
With no related allowance recorded	411		411	659
With an allowance recorded	0		0	484
Total:	411		411	1,143
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	454		454	703
With an allowance recorded	0		0	484
Total:	454		454	1,187
Related Allowance	0		0	3
Average Recorded Investment
With no related allowance recorded	653	[1]	717	1,127
With an allowance recorded	0	[1]	121	194
Total	653	[1]	838	1,321
Interest Income Recognized
With no related allowance recorded	8	[1]	50	44	[1]
With an allowance recorded	0	[1]	0	16
Total	8	[1]	50	60
Cash Basis Interest Income Recognized
With no related allowance recorded	8	[1]	45	34
With an allowance recorded	0	[1]	0	8
Total	8	[1]	45	42
Mortgage loans, commercial
Recorded Investment
With no related allowance recorded	2,753		2,753	3,242
Total:	2,753		2,753	3,242
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	2,753		2,753	3,242
Total:	2,753		2,753	3,242
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	2,891	[1]	3,013	3,236
Total	2,891	[1]	3,013	3,236
Interest Income Recognized
With no related allowance recorded	39	[1]	120	133	[1]
Total	39	[1]	120	133
Cash Basis Interest Income Recognized
With no related allowance recorded	32	[1]	95	107
Total	32	[1]	95	107
Mortgage loans, land
Recorded Investment
With no related allowance recorded	169		169	394
With an allowance recorded				0
Total:	169		169	394
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	169		169	438
With an allowance recorded				0
Total:	169		169	438
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	171	[1]	285	125
With an allowance recorded				110
Total	171	[1]	285	235
Interest Income Recognized
With no related allowance recorded	1	[1]	2	0	[1]
With an allowance recorded				0
Total	1	[1]	2	0
Cash Basis Interest Income Recognized
With no related allowance recorded	1	[1]	2	0
With an allowance recorded				0
Total	1	[1]	2	0
Consumer loans, home equity and second mortgage
Recorded Investment
With no related allowance recorded	545		545	555
Total:	545		545	555
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	545		545	555
Total:	545		545	555
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	542	[1]	561	581
Total	542	[1]	561	581
Interest Income Recognized
With no related allowance recorded	1	[1]	1	0	[1]
Total	1	[1]	1	0
Cash Basis Interest Income Recognized
With no related allowance recorded	1	[1]	1	0
Total	1	[1]	1	0
Consumer loans, other
Recorded Investment
With no related allowance recorded	17		17	9
With an allowance recorded				0
Total:	17		17	9
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	17		17	9
With an allowance recorded				0
Total:	17		17	9
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	13	[1]	11	6
With an allowance recorded				7
Total	13	[1]	11	13
Interest Income Recognized
With no related allowance recorded	0	[1]	0	0
With an allowance recorded				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 loans
Recorded Investment
With no related allowance recorded	220		220	182
With an allowance recorded	294		294	248
Total:	514		514	430
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	222		222	182
With an allowance recorded	294		294	248
Total:	516		516	430
Related Allowance	171		171	38
Average Recorded Investment
With no related allowance recorded	227	[1]	209	176
With an allowance recorded	295		283	370
Total	521	[1]	492	546
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 three months ended June 30, 2021

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