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Summary of Stock Activity (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2016
USD ($)
Years
$ / shares
shares
Sep. 30, 2016
USD ($)
Years
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options outstanding | shares 236,385 263,560
Options granted | shares 19,600  
Options exercised | shares (46,775)  
Options outstanding weighted average exercise price | $ / shares $ 25.35 $ 23.50
Options outstanding weighted average exercise price - Granted | $ / shares 39.00  
Options outstanding weighted average exercise price - Exercised | $ / shares $ 20.66  
Options outstanding weighted average remaining term | Years 6.1 5.6
Options outstanding weighted average grant date fair value | $ $ 2,440 $ 2,539
Options granted weighted average grant date fair value | $ 297  
Options exercised weighted average grant date fair value | $ $ (396)  
Options exercisable at December 31, 2016 | shares 171,811  
Options exerciseable weighted average exercise price | $ / shares $ 23.48  
Options exerciseable weighted average remaining term | Years 5.3  
Options exerciseable weighted average grant date fair value | $ $ 1,570  
Options vested during three months ended December 31, 2016 | shares 38,433  
Options vested weighted average grant date fair value | $ $ 391