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Loans Receivable And Allowance For Loan Losses - Land and Commercial Business Loans (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) contract | Sep. 30, 2019 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of contracts | contract | 125 |
Troubled debt restructured loan | $ 3,220 | $ 3,269
Portfolio Segment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of contracts | contract |  | 1
Pre-modification TDR balance |  | $ 85
Post-modification TDR balance |  | 85
Troubled debt restructured loan |  | $ 82
Mortgage loans, land |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Troubled debt restructured loan | $ 136 |
Mortgage loans, land | Portfolio Segment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of contracts | contract |  | 1
Pre-modification TDR balance |  | $ 85
Post-modification TDR balance |  | 85
Troubled debt restructured loan |  | $ 82

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + 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 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + 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 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + 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 + Details
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