Stock-Based Compensation - Restricted Stock Plan and Performance Shares (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
Dec. 31, 2020 | Dec. 31, 2019 |
Restricted Stock | 2009 Restricted Stock Plan | | |
Restricted stock plan activity, number of shares | | |
Unvested and deferred at beginning of the period (in shares) | 141,680 | |
Granted (in shares) | 55,718 | |
Vested and deferred (in shares) | (23,629) | |
Unvested and deferred at end of the period (in shares) | 173,769 | |
Expected to vest (in shares) | 173,769 | |
Restricted stock plan activity, Weighted Average Fair Value at Grant Date | | |
Unvested and deferred at beginning of the period (in dollars per share) | $ 27.71 | |
Granted (in dollars per share) | 22.64 | |
Vested and deferred (in dollars per share) | 32.80 | |
Unvested and deferred at end of the period (in dollars per share) | 25.39 | |
Expected to vest (in dollars per share) | $ 25.39 | |
Deferred Restricted Stock plan activity, number of shares | | |
Vested (in shares) | 23,629 | |
Deferred Restricted Stock plan activity, Weighted Average Fair Value at Grant Date | | |
Vested and deferred (in dollars per share) | $ 32.80 | |
Restricted stock plan activity, other disclosures | | |
Compensation expense | $ 495 | $ 215 |
Remaining unrecognized compensation expense | $ 3,027 | |
Weighted average period for recognition | 1 year 5 months 4 days | |
Restricted Stock | 2009 Restricted Stock Plan | Employee | | |
Restricted stock plan activity, other disclosures | | |
Repurchase of stock from employees (in shares) | 10,439 | |
Average purchase price (in dollars per share) | $ 22.81 | |
Deferred Restricted Stock | 2016 Restricted Stock Plan | | |
Restricted stock plan activity, number of shares | | |
Vested and deferred (in shares) | (28,218) | |
Restricted stock plan activity, Weighted Average Fair Value at Grant Date | | |
Vested and deferred (in dollars per share) | $ 31.98 | |
Deferred Restricted Stock plan activity, number of shares | | |
Outstanding at beginning of period (in shares) | 5,152 | |
Granted (in shares) | 7,398 | |
Vested and deferred (in shares) | (5,152) | |
Outstanding at end of period (in shares) | 7,398 | |
Vested (in shares) | 28,218 | |
Deferred Restricted Stock plan activity, Weighted Average Fair Value at Grant Date | | |
Outstanding at beginning of period (in dollars per share) | $ 31.78 | |
Granted (in dollars per share) | 22.64 | |
Vested and deferred (in dollars per share) | 31.78 | |
Outstanding at end of period (in dollars per share) | 22.64 | |
Vested and deferred (in dollars per share) | $ 31.98 | |
Restricted stock plan activity, other disclosures | | |
Compensation expense | $ 63 | 85 |
Remaining unrecognized compensation expense | $ 154 | |
Weighted average period for recognition | 11 months 1 day | |
Performance Shares | | |
Restricted stock plan activity, number of shares | | |
Vested and deferred (in shares) | (13,200) | |
Deferred Restricted Stock plan activity, number of shares | | |
Vested (in shares) | 13,200 | |
Performance Shares | Certain Employees | | |
Stock-Based Compensation | | |
Remaining unrecognized compensation expense | $ 2,010 | |
Restricted stock plan activity, number of shares | | |
Unvested and deferred at beginning of the period (in shares) | 61,362 | |
Granted (in shares) | 39,031 | |
Vested and deferred (in shares) | (13,200) | |
Unvested and deferred at end of the period (in shares) | 87,193 | |
Restricted stock plan activity, Weighted Average Fair Value at Grant Date | | |
Unvested and deferred at beginning of the period (in dollars per share) | $ 43.22 | |
Granted (in dollars per share) | 28.23 | |
Vested and deferred (in dollars per share) | 38.43 | |
Unvested and deferred at end of the period (in dollars per share) | $ 37.24 | |
Deferred Restricted Stock plan activity, number of shares | | |
Vested (in shares) | 13,200 | |
Deferred Restricted Stock plan activity, Weighted Average Fair Value at Grant Date | | |
Vested and deferred (in dollars per share) | $ 38.43 | |
Restricted stock plan activity, other disclosures | | |
Stock issued to certain employees | 11,366 | |
Compensation expense | $ 222 | $ 176 |
Weighted average period for recognition | 1 year 9 months 7 days | |