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Equity Incentive Plan - Narrative (Details) - USD ($)
12 Months Ended
Jun. 30, 2013
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity incentive plan name   2013 Omnibus Incentive Plan        
Stock repurchase program, authorized amount           $ 13,297,000
Average cost per share repurchased (in dollars per share)           $ 15.71
Restricted stock and stock option expense   $ 2,102,000 $ 1,822,000 $ 1,601,000    
Tax benefit from exercise of stock options and restricted stock   $ 494,000 $ 428,000 $ 376,000    
Options outstanding (in shares)   244,750 317,500      
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.        
Shares authorized (in shares)   2,962,400        
Shares authorized for stock options and stock appreciation rights (in shares)   2,116,000        
Shares authorized for awards of restricted stock and restricted stock units (in shares) 846,400 846,400        
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense   $ 1,258,000 $ 1,701,000      
Options outstanding (in shares)   1,319,456 1,615,500 1,657,214 1,718,270  
Unrecognized compensation cost, period for recognition   1 year 7 months 6 days 1 year 9 months 18 days      
Share-based payment award, expiration period   10 years        
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense   $ 2,811,000 $ 3,048,000      
Granted (in shares)   58,547 67,556 34,000    
Non-option equity instruments, outstanding (in shares)   151,575 144,046      
Weighted average period for recognition of unrecognized compensation expense   1 year 8 months 12 days 1 year 9 months 18 days      
Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options/awards, vesting period   3 years        
Granted (in shares)   30,780 11,250      
Minimum | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options/awards, vesting period   5 years 5 years      
Minimum | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options/awards, vesting period   3 years 3 years      
Maximum | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options/awards, vesting period   5 years 5 years