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Loans Receivable and Allowance for Loan Losses: Significant Concentrations of Credit Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	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

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- Definition

Loans Receivable, Ratio of Loans to Appraisal or Purchase Price

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No definition available.

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No definition available.

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