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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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