Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

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Share-Based Payments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation cost $ 2,031 $ 3,647
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued under the 2017 Equity incentive plan 296,000  
Percent of shares vested on time 40.00%  
Unrecognized compensation cost on non-vested awards $ 15,410  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards 2 years 4 months 24 days  
Restricted stock awards unvested (in shares) 34,542  
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 558,200  
Retirement Eligible Employees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation cost $ 313 1,849
Future income tax benefit from compensation expense recognized 179 $ 535
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) 25,767  
Value of annual stock based grant $ 125  
Total restricted stock awards granted to date (in shares) 196,266  
Restricted stock awards unvested (in shares) 23,037