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Loans Receivable And Allowance For Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2022		Mar. 31, 2022	Sep. 30, 2021
Recorded Investment
With no related allowance recorded	$ 4,898		$ 4,898	$ 4,568
With an allowance recorded	249		249	656
Total:	5,147		5,147	5,224
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	4,989		4,989	4,615
With an allowance recorded	249		249	656
Total:	5,238		5,238	5,271
Related Allowance	127		127	247
Average Recorded Investment
With no related allowance recorded	4,726	[1]	4,673	4,750
With an allowance recorded	455	[1]	522	454
Total	5,181	[1]	5,195	5,204
Interest Income Recognized
With no related allowance recorded	48	[1]	96	220	[1]
With an allowance recorded	0	[1]	0	0
Total	48	[1]	96	220
Cash Basis Interest Income Recognized
With no related allowance recorded	41	[1]	80	182
With an allowance recorded	0	[1]	0	0
Total	41	[1]	80	182
Mortgage loans, one-to-four family
Recorded Investment
With no related allowance recorded	578		578	407
With an allowance recorded				0
Total:	578		578	407
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	621		621	450
With an allowance recorded				0
Total:	621		621	450
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	580	[1]	522	655
With an allowance recorded				97
Total	580	[1]	522	752
Interest Income Recognized
With no related allowance recorded	8	[1]	16	58	[1]
With an allowance recorded				0
Total	8	[1]	16	58
Cash Basis Interest Income Recognized
With no related allowance recorded	8	[1]	16	52
With an allowance recorded				0
Total	8	[1]	16	52
Mortgage loans, commercial
Recorded Investment
With no related allowance recorded	3,023		3,023	3,143
Total:	3,023		3,023	3,143
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	3,023		3,023	3,143
Total:	3,023		3,023	3,143
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	3,030	[1]	3,068	3,039
Total	3,030	[1]	3,068	3,039
Interest Income Recognized
With no related allowance recorded	39	[1]	79	159	[1]
Total	39	[1]	79	159
Cash Basis Interest Income Recognized
With no related allowance recorded	32	[1]	63	127
Total	32	[1]	63	127
Mortgage loans, land
Recorded Investment
With no related allowance recorded	723		723	321
With an allowance recorded	0		0	362
Total:	723		723	683
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	723		723	321
With an allowance recorded	0		0	362
Total:	723		723	683
Related Allowance	0		0	76
Average Recorded Investment
With no related allowance recorded	518	[1]	452	292
With an allowance recorded	181	[1]	241	72
Total	699	[1]	693	364
Interest Income Recognized
With no related allowance recorded	0	[1]	0	2	[1]
With an allowance recorded	0	[1]	0	0
Total	0	[1]	0	2
Cash Basis Interest Income Recognized
With no related allowance recorded	0	[1]	0	2
With an allowance recorded	0	[1]	0	0
Total	0	[1]	0	2
Consumer loans, home equity and second mortgage
Recorded Investment
With no related allowance recorded	413		413	516
Total:	413		413	516
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	413		413	516
Total:	413		413	516
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	435	[1]	462	552
Total	435	[1]	462	552
Interest Income Recognized
With no related allowance recorded	1	[1]	1	1	[1]
Total	1	[1]	1	1
Cash Basis Interest Income Recognized
With no related allowance recorded	1	[1]	1	1
Total	1	[1]	1	1
Consumer loans, other
Recorded Investment
With no related allowance recorded	5		5	17
Total:	5		5	17
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	5		5	17
Total:	5		5	17
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	5	[1]	9	12
Total	5	[1]	9	12
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 loans
Recorded Investment
With no related allowance recorded	156		156	164
With an allowance recorded	249		249	294
Total:	405		405	458
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	204		204	168
With an allowance recorded	249		249	294
Total:	453		453	462
Related Allowance	127		127	171
Average Recorded Investment
With no related allowance recorded	158	[1]	160	200
With an allowance recorded	274		281	285
Total	432	[1]	441	485
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 March 31, 2022

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