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Premises and Equipment: Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 38,935 $ 33,757
Less accumulated depreciation 16,105 14,804
Premises and equipment, net 22,830 18,953
Land    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 5,404 4,400
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 23,847 20,636
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 9,012 8,026
Property held for future expansion    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 334 129
Construction and purchases in progress    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 338 $ 566