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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, 2025	Sep. 30, 2024
Receivables [Abstract]
Loans secured by real estate	$ 1,446,469
Undisbursed portion of construction loans in process (see Note 4)	$ 88,289	$ 69,878
Loans secured by real estate, percentage of total portfolio (as a percent)	91.81%
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)	85.00%