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Premises and Equipment: Rent Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Property, Plant and Equipment [Line Items]      
Operating leases, rent expense $ 275 $ 287 $ 280
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