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Equity Incentive Plan - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 17, 2013
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity incentive plan name 2013 Omnibus Incentive Plan          
Nonvested, number of shares (in shares)   401,800 486,800      
Remaining contractual life (years)   4 years 10 months 24 days 5 years 8 months 12 days 5 years 5 years 10 months 31 days  
Options outstanding (in shares)     486,800      
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation cost not yet recognized   $ 2,052 $ 2,585      
Compensation cost not yet recognized, period for recognition (in years)   1 year 8 months 12 days 2 years 1 month      
Stock Options | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Remaining contractual life (years)   5 years 5 years      
Stock Options | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Remaining contractual life (years)   7 years 7 years      
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation cost not yet recognized, period for recognition (in years)   1 year 8 months 12 days 1 year 11 months      
Compensation not yet recognized, share-based awards other than options   $ 2,579 $ 2,337      
Non-vested (in shares)   133,200 128,610 133,410   123,800
Restricted Stock | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period   5 years 5 years      
Restricted Stock | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period   7 years 7 years      
Performance Restricted Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Non-vested (in shares)   10,375        
Vesting period   3 years        
2013 Omnibus Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity incentive plan description provides for awards of restricted stock, restricted stock units, stock options, stock appreciation rights and cash awards to directors, emeritus directors, officers, employees and advisory directors          
Number of shares authorized (in shares) 2,962,400          
Shares held for awards of stock options and stock appreciation rights (in shares) 2,116,000          
Shares held for awards of restricted stock and restricted stock units (in shares) 846,400