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Equity Incentive Plan - Schedule of Nonvested Restricted Stock Units Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Weighted- average grant date fair value        
Aggregate intrinsic value (in usd) $ 13,509 $ 17,553    
Restricted Stock        
Restricted stock awards        
Non-vested, Beginning Balance (in shares) 123,800 133,410    
Granted (in shares) 13,000      
Vested (in shares) 400 2,800    
Forfeited (in shares) 3,200 2,000    
Non-vested, Ending Balance (in shares) 133,200 128,610    
Weighted- average grant date fair value        
Non-vested, Beginning Balance (in usd per share) $ 24.65 $ 22.85    
Granted (in usd per share) 25.37      
Vested (in usd per share) 19.02 16.27    
Forfeitures (in dollars per share) 20.62 14.37    
Non-vested, Ending Balance (in usd per share) $ 24.83 $ 23.13    
Aggregate intrinsic value (in usd) $ 2,256 $ 3,749 $ 2,258 $ 3,755