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Stock-Based Compensation - Restricted Stock Plan and Performance Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 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)     61,838  
Granted (in shares)     37,011  
Forfeited / Canceled (in shares)     (550)  
Vested and deferred (in shares)     (16,647)  
Unvested and deferred at end of the period (in shares) 81,652   81,652  
Expected to vest (in shares) 81,652   81,652  
Restricted stock plan activity, Weighted Average Fair Value at Grant Date        
Unvested and deferred at beginning of the period (in dollars per share)     $ 34.94  
Granted (in dollars per share)     36.67  
Forfeited / Canceled (in dollars per share)     34.00  
Vested and deferred (in dollars per share)     40.33  
Unvested and deferred at end of the period (in dollars per share) $ 34.62   34.62  
Expected to vest (in dollars per share) $ 34.62   $ 34.62  
Deferred Restricted Stock plan activity, number of shares        
Vested (in shares)     16,647  
Deferred Restricted Stock plan activity, Weighted Average Fair Value at Grant Date        
Vested and deferred (in dollars per share)     $ 40.33  
Restricted stock plan activity, other disclosures        
Compensation expense $ 340 $ 219 $ 556 $ 272
Remaining unrecognized compensation expense $ 1,759   $ 1,759  
Weighted average period for recognition     1 year 7 months 13 days  
Restricted Stock | 2009 Restricted Stock Plan | Employee        
Restricted stock plan activity, other disclosures        
Repurchase of stock from employees (in shares)     5,440  
Average purchase price (in dollars per share) $ 36.38   $ 36.38  
Restricted Stock | 2016 Restricted Stock Plan        
Restricted stock plan activity, other disclosures        
Compensation expense     $ 143 229
Deferred Restricted Stock | 2016 Restricted Stock Plan        
Restricted stock plan activity, number of shares        
Vested and deferred (in shares)     (29,050)  
Restricted stock plan activity, Weighted Average Fair Value at Grant Date        
Vested and deferred (in dollars per share)     $ 32.72  
Deferred Restricted Stock plan activity, number of shares        
Outstanding at beginning of period (in shares)     12,500  
Granted (in shares)     7,449  
Vested and deferred (in shares)     (12,500)  
Outstanding at end of period (in shares) 7,449   7,449  
Vested (in shares)     29,050  
Deferred Restricted Stock plan activity, Weighted Average Fair Value at Grant Date        
Outstanding at beginning of period (in dollars per share)     $ 33.98  
Granted (in dollars per share)     33.39  
Vested and deferred (in dollars per share)     33.98  
Outstanding at end of period (in dollars per share) $ 33.39   33.39  
Vested and deferred (in dollars per share)     $ 32.72  
Restricted stock plan activity, other disclosures        
Compensation expense $ 58 106    
Remaining unrecognized compensation expense 176   $ 176  
Weighted average period for recognition     8 months 1 day  
Performance Shares | Certain Employees        
Stock-Based Compensation        
Remaining unrecognized compensation expense $ 1,606   $ 1,606  
Restricted stock plan activity, number of shares        
Unvested and deferred at beginning of the period (in shares)     38,553  
Granted (in shares)     23,880  
Unvested and deferred at end of the period (in shares) 62,433   62,433  
Restricted stock plan activity, Weighted Average Fair Value at Grant Date        
Unvested and deferred at beginning of the period (in dollars per share)     $ 42.52  
Granted (in dollars per share)     44.13  
Unvested and deferred at end of the period (in dollars per share) $ 43.14   $ 43.14  
Restricted stock plan activity, other disclosures        
Compensation expense $ 238 $ 204 $ 414 $ 325
Weighted average period for recognition     1 year 8 months 9 days