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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, 2017
Sep. 30, 2016
Sep. 30, 2015
Loans and Leases Receivable, Related Parties [Roll Forward]      
Balance, beginning of year $ 230 $ 630 $ 927
New loans or borrowings 592 66 112
Repayments and reclassifications (81) (466) (409)
Balance, end of year $ 741 $ 230 $ 630