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Premises and Equipment: Rent Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]      
Operating leases, rent expense $ 332 $ 206 $ 275
Minimum      
Property, Plant and Equipment [Line Items]      
Operating leases, renewal term 5 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Operating leases, renewal term 10 years