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Equity Incentive Plan - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2019
Options          
Options Outstanding, Beginning of Period (in shares) 1,657,214 1,718,270      
Granted (in shares) 25,000        
Exercised (in shares) 13,400 28,500      
Forfeited (in shares) 800 4,000      
Options Outstanding, End of period (in shares) 1,668,014 1,685,770 1,718,270    
Exercisable (in shares) 1,266,214 1,198,970      
Weighted- average exercise price          
Options Outstanding, Beginning of Period (in usd per share) $ 17.59 $ 17.29      
Granted (in usd per share) 25.37        
Exercised (in usd per share) 14.50 14.41      
Forfeited (in usd per share) 17.35 14.37      
Options Outstanding, End of Period (in usd per share) 17.73 17.34 $ 17.29    
Exercisable (in usd per share) $ 15.40 $ 14.51      
Remaining contractual life (years) 4 years 10 months 24 days 5 years 8 months 12 days 5 years 5 years 10 months 31 days  
Aggregate intrinsic value (in usd) $ 13,969 $ 19,902 $ 18,664   $ 12,909
Exercisable (in years) 3 years 9 months 18 days 4 years 6 months      
Aggregate intrinsic value (in usd) $ 13,509 $ 17,553      
Non-vested Options          
Nonvested, number of shares (in shares) 401,800 486,800      
Nonvested, weighted average grant date fair value (in dollars per share) $ 25.07 $ 24.32      
Nonvested, contractual term (in years) 8 years 1 month 21 days 6 years 6 months      
Nonvested, intrinsic value $ 460 $ 2,349