Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

v3.20.4
Share-Based Payments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation cost $ 3,246 $ 2,031
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued under the 2017 Equity incentive plan 499,050  
Percent of shares vested on time 45.00%  
Unrecognized compensation cost on non-vested awards $ 22,827  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards 2 years 6 months  
Restricted stock awards unvested (in shares) 71,686  
Restricted Stock | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period 3 years  
Restricted Stock | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period 5 years  
Restricted Stock | After 3 Years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting increment 50.00%  
Restricted Stock | Attainment of Pre-Defined Levels of Appreciation in Market Value    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting increment 25.00%  
Restricted Stock | Attainment of Pre-Defined Levels of Adjusted Earnings Per Share    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting increment 25.00%  
2017 Equity Incentive Plan | Stock Compensation Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Term of plan 10 years  
Maximum number of shares available for grants or awards (in shares) 1,700,000  
Shares reserved for future issuance under award plan (in shares) 1,700,000  
2017 Equity Incentive Plan | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued under the 2017 Equity incentive plan 1,064,910  
Retirement Eligible Employees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation cost $ 883 313
Future income tax benefit from compensation expense recognized 239 $ 179
2014 Director Fee Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Annual retainer fee paid to non-employee directors 85  
Annual retainer fee paid to non-employee Chairman of the Board $ 185  
2019 Director Fee Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum number of shares available for grants or awards (in shares) 150,000  
Director Fee Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares deferred under stock based compensation plan (in shares) 30,925  
Value of annual stock based grant $ 125  
Total restricted stock awards granted to date (in shares) 244,915  
Restricted stock awards unvested (in shares) 71,686