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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, 2021		Mar. 31, 2021	Sep. 30, 2020
Recorded Investment
With no related allowance recorded	$ 4,875		$ 4,875	$ 5,041
With an allowance recorded	294		294	732
Total:	5,169		5,169	5,773
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	4,956		4,956	5,129
With an allowance recorded	294		294	732
Total:	5,250		5,250	5,861
Related Allowance	73		73	41
Average Recorded Investment
With no related allowance recorded	5,016	[1]	5,024	5,251
With an allowance recorded	295	[1]	440	681
Total	5,311	[1]	5,464	5,932
Interest Income Recognized
With no related allowance recorded	61	[1]	123	177	[1]
With an allowance recorded	0	[1]	0	16
Total	61	[1]	123	193
Cash Basis Interest Income Recognized
With no related allowance recorded	51	[1]	101	141
With an allowance recorded	0	[1]	0	8
Total	51	[1]	101	149
Mortgage loans, one-to-four family
Recorded Investment
With no related allowance recorded	895		895	659
With an allowance recorded	0		0	484
Total:	895		895	1,143
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	938		938	703
With an allowance recorded	0		0	484
Total:	938		938	1,187
Related Allowance	0		0	3
Average Recorded Investment
With no related allowance recorded	899	[1]	819	1,127
With an allowance recorded	0	[1]	161	194
Total	899	[1]	980	1,321
Interest Income Recognized
With no related allowance recorded	19	[1]	41	44	[1]
With an allowance recorded	0	[1]	0	16
Total	19	[1]	41	60
Cash Basis Interest Income Recognized
With no related allowance recorded	16	[1]	36	34
With an allowance recorded	0	[1]	0	8
Total	16	[1]	36	42
Mortgage loans, commercial
Recorded Investment
With no related allowance recorded	3,028		3,028	3,242
Total:	3,028		3,028	3,242
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	3,028		3,028	3,242
Total:	3,028		3,028	3,242
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	3,028	[1]	3,099	3,236
Total	3,028	[1]	3,099	3,236
Interest Income Recognized
With no related allowance recorded	40	[1]	80	133	[1]
Total	40	[1]	80	133
Cash Basis Interest Income Recognized
With no related allowance recorded	33	[1]	63	107
Total	33	[1]	63	107
Mortgage loans, land
Recorded Investment
With no related allowance recorded	173		173	394
With an allowance recorded				0
Total:	173		173	394
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	208		208	438
With an allowance recorded				0
Total:	208		208	438
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	289	[1]	324	125
With an allowance recorded				110
Total	289	[1]	324	235
Interest Income Recognized
With no related allowance recorded	1	[1]	1	0	[1]
With an allowance recorded				0
Total	1	[1]	1	0
Cash Basis Interest Income Recognized
With no related allowance recorded	1	[1]	1	0
With an allowance recorded				0
Total	1	[1]	1	0
Consumer loans, home equity and second mortgage
Recorded Investment
With no related allowance recorded	538		538	555
Total:	538		538	555
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	538		538	555
Total:	538		538	555
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	573	[1]	567	581
Total	573	[1]	567	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	8		8	9
With an allowance recorded				0
Total:	8		8	9
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	8		8	9
With an allowance recorded				0
Total:	8		8	9
Related Allowance	0		0	0
Average Recorded Investment
With no related allowance recorded	9	[1]	9	6
With an allowance recorded				7
Total	9	[1]	9	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	233		233	182
With an allowance recorded	294		294	248
Total:	527		527	430
Unpaid Principal Balance (Loan Balance Plus Charge Off)
With no related allowance recorded	236		236	182
With an allowance recorded	294		294	248
Total:	530		530	430
Related Allowance	73		73	38
Average Recorded Investment
With no related allowance recorded	218	[1]	206	176
With an allowance recorded	295		279	370
Total	513	[1]	485	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 March 31, 2021

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