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Nature of Business and Significant Accounting Policies - Impairment and Stock based compensation (Details) - USD ($)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Long-term assets    
Recognized impairment $ 0 $ 0
Award vesting period 5 years  
Buildings and improvements | Minimum    
Premises and equipment    
Depreciable life 25 years  
Buildings and improvements | Maximum    
Premises and equipment    
Depreciable life 40 years  
Routine building improvements | Minimum    
Premises and equipment    
Depreciable life 10 years  
Routine building improvements | Maximum    
Premises and equipment    
Depreciable life 20 years  
Furniture and equipment | Minimum    
Premises and equipment    
Depreciable life 5 years  
Furniture and equipment | Maximum    
Premises and equipment    
Depreciable life 15 years  
Vehicles    
Premises and equipment    
Depreciable life 5 years  
Computer equipment | Minimum    
Premises and equipment    
Depreciable life 2 years  
Computer equipment | Maximum    
Premises and equipment    
Depreciable life 5 years