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Premises and Equipment: Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 33,757 $ 32,782
Less accumulated depreciation 14,804 14,364
Premises and equipment, net 18,953 18,418
Land    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 4,400 4,402
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 20,636 20,167
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 8,026 7,935
Property held for future expansion    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 129 129
Construction and purchases in progress    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 566 $ 149