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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, 2018
Sep. 30, 2017
Sep. 30, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]      
Balance, beginning of year $ 741 $ 230 $ 630
New loans or borrowings 368 592 66
Repayments and reclassifications (990) (81) (466)
Balance, end of year $ 119 $ 741 $ 230