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Loans Receivable And Allowance For Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021
Recorded Investment
With no related allowance recorded	$ 4,553	$ 4,568
With an allowance recorded	661	656
Total:	5,214	5,224
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	4,599	4,615
With an allowance recorded	661	656
Total:	5,260	5,271
Related Allowance	254	247
Average Recorded Investment
With no related allowance recorded	4,562	4,750
With an allowance recorded	659	454
Total	5,221	5,204
Interest Income Recognized
With no related allowance recorded	48	220	[1]
With an allowance recorded	0	0
Total	48	220
Cash Basis Interest Income Recognized
With no related allowance recorded	39	182
With an allowance recorded	0	0
Total	39	182
Mortgage loans, one-to-four family
Recorded Investment
With no related allowance recorded	582	407
With an allowance recorded		0
Total:	582	407
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	625	450
With an allowance recorded		0
Total:	625	450
Related Allowance	0	0
Average Recorded Investment
With no related allowance recorded	495	655
With an allowance recorded		97
Total	495	752
Interest Income Recognized
With no related allowance recorded	8	58	[1]
With an allowance recorded		0
Total	8	58
Cash Basis Interest Income Recognized
With no related allowance recorded	8	52
With an allowance recorded		0
Total	8	52
Mortgage loans, commercial
Recorded Investment
With no related allowance recorded	3,037	3,143
Total:	3,037	3,143
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	3,037	3,143
Total:	3,037	3,143
Related Allowance	0	0
Average Recorded Investment
With no related allowance recorded	3,090	3,039
Total	3,090	3,039
Interest Income Recognized
With no related allowance recorded	40	159	[1]
Total	40	159
Cash Basis Interest Income Recognized
With no related allowance recorded	31	127
Total	31	127
Mortgage loans, land
Recorded Investment
With no related allowance recorded	313	321
With an allowance recorded	362	362
Total:	675	683
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	313	321
With an allowance recorded	362	362
Total:	675	683
Related Allowance	78	76
Average Recorded Investment
With no related allowance recorded	317	292
With an allowance recorded	362	72
Total	679	364
Interest Income Recognized
With no related allowance recorded	0	2	[1]
With an allowance recorded	0	0
Total	0	2
Cash Basis Interest Income Recognized
With no related allowance recorded	0	2
With an allowance recorded	0	0
Total	0	2
Consumer loans, home equity and second mortgage
Recorded Investment
With no related allowance recorded	456	516
Total:	456	516
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	456	516
Total:	456	516
Related Allowance	0	0
Average Recorded Investment
With no related allowance recorded	486	552
Total	486	552
Interest Income Recognized
With no related allowance recorded	0	1	[1]
Total	0	1
Cash Basis Interest Income Recognized
With no related allowance recorded	0	1
Total	0	1
Consumer loans, other
Recorded Investment
With no related allowance recorded	5	17
Total:	5	17
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	5	17
Total:	5	17
Related Allowance	0	0
Average Recorded Investment
With no related allowance recorded	11	12
Total	11	12
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 loans
Recorded Investment
With no related allowance recorded	160	164
With an allowance recorded	299	294
Total:	459	458
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	163	168
With an allowance recorded	299	294
Total:	462	462
Related Allowance	176	171
Average Recorded Investment
With no related allowance recorded	163	200
With an allowance recorded	297	285
Total	460	485
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 three months ended December 31, 2021

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