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Loans Receivable and Allowance for Loan Losses: Schedule of Activity in Related Party Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Loans and Leases Receivable, Related Parties [Roll Forward]      
Balance, beginning of year $ 94 $ 119 $ 741
New loans or borrowings 178 1 368
Repayments and reclassifications (24) (26) (990)
Balance, end of year $ 248 $ 94 $ 119