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Loans Receivable And Allowance For Loan Losses: Schedule 1 of Troubled debt restructured loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	$ 3,056	$ 3,071
Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	2,864	2,868
Non-Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	192	203
Mortgage loans, one-to-four family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	479	483
Mortgage loans, one-to-four family | Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	479	483
Mortgage loans, one-to-four family | Non-Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	0	0
Mortgage loans, commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	2,385	2,385
Mortgage loans, commercial | Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	2,385	2,385
Mortgage loans, commercial | Non-Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	0	0
Mortgage loans, land
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	124	130
Mortgage loans, land | Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	0	0
Mortgage loans, land | Non-Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	124	130
Consumer loans, home equity and second mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	68	73
Consumer loans, home equity and second mortgage | Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	0	0
Consumer loans, home equity and second mortgage | Non-Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured loan	$ 68	$ 73

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Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554

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