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Loans Receivable and Allowance for Loan Losses: Significant Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Sep. 30, 2020 | Sep. 30, 2019
Receivables [Abstract] |  |
Loans secured by real estate | $ 934,351 |
Undisbursed portion of construction loans in process | $ 100,558 | $ 92,226
Loans secured by real estate, percentage of total portfolio (as a percent) | 82.40% |
Concentration of credit risk, real estate loans by industry, benchmark percentage (as a percent) | 20.00% |
Ratio of loans to appraisal or purchase price (as a percent) | 90.00% |

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- Definition Concentration of Credit Risk, Real Estate Loans by Industry, Benchmark Percentage + References No definition available. + Details
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- References No definition available. + Details
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- References No definition available. + Details
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- References No definition available. + Details
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