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Premises and Equipment: Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 32,782 $ 29,733
Less accumulated depreciation 14,364 13,574
Premises and equipment, net 18,418 16,159
Land    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 4,402 3,926
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 20,167 17,709
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 7,935 7,732
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 $ 149 $ 237