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Loans Receivable And Allowance For Loan Losses: COVID Modifications (Details) $ in Thousands	Mar. 31, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loan category to total loans, modified for COVID	100.00%	100.00%
Number of commercial loans modified | loan	8	5
Commercial loans modified for COVID | $	$ 12,884	$ 5,870
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of mortgage loans modified | loan	5	4
Mortgage loans modified for COVID | $	$ 12,691	$ 5,820
Ratio of loan category to total loans, modified for COVID	98.50%	99.10%
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of mortgage loans modified | loan		1
Mortgage loans modified for COVID | $		$ 467
Ratio of loan category to total loans, modified for COVID		8.00%
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of mortgage loans modified | loan	4	2
Mortgage loans modified for COVID | $	$ 11,174	$ 3,951
Ratio of loan category to total loans, modified for COVID	86.70%	67.20%
Mortgage loans, construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of mortgage loans modified | loan	1	1
Mortgage loans modified for COVID | $	$ 1,517	$ 1,402
Ratio of loan category to total loans, modified for COVID	11.80%	23.90%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loan category to total loans, modified for COVID	0.10%	0.90%
Number of consumer loans modified | loan	1	1
Consumer loans, modified for COVID | $	$ 18	$ 50
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loan category to total loans, modified for COVID	0.10%	0.90%
Number of consumer loans modified | loan	1	1
Consumer loans, modified for COVID | $	$ 18	$ 50
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loan category to total loans, modified for COVID	1.40%
Number of commercial loans modified | loan	2
Commercial loans modified for COVID | $	$ 175

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