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STOCK OPTION PLAN (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Officers
$ / shares
shares
Sep. 30, 2015
Number of Shares    
Options outstanding, beginning of period (in shares) | shares 125,560  
Granted (in shares) | shares 0  
Exercised (in shares) | shares (4,023)  
Forfeited or expired (in shares) | shares (16,252)  
Options outstanding, end of period (in shares) | shares 105,285  
Options exercisable, end of period (in shares) | shares 105,285  
Weighted Average Exercise Price    
Options outstanding, beginning of period (in dollars per share) | $ / shares $ 25.73  
Granted (in dollars per share) | $ / shares 0.00  
Exercised (in dollars per share) | $ / shares 35.69  
Forfeited or expired (in dollars per share) | $ / shares 25.00  
Options outstanding, end of period (in dollars per share) | $ / shares 25.52  
Options exercisable, end of period (in dollars per share) | $ / shares $ 25.79  
Weighted Average Remaining Contractual Term    
Options outstanding 2 years 5 months 19 days 2 years 8 months 5 days
Options exercisable 2 years 5 months 9 days  
Aggregate Intrinsic Value    
Options outstanding, beginning of period | $ $ 4,379  
Granted | $ 0  
Exercised | $ 229  
Forfeited or expired | $ 1,272  
Options outstanding, end of period | $ 8,147  
Options exercisable, end of period | $ $ 8,147  
Number of Shares    
Nonvested shares outstanding, beginning of period (in shares) | shares 20,656  
Granted (in shares) | shares 279,065  
Vested (in shares) | shares (13,927)  
Forfeited or expired (in shares) | shares 0  
Nonvested shares outstanding, end of period (in shares) | shares 285,794  
Weighted Average Fair Value at Grant    
Nonvested shares outstanding, beginning of period (in dollars per share) | $ / shares $ 41.37  
Granted (in dollars per share) | $ / shares 86.47  
Vested (in dollars per share) | $ / shares 64.72  
Forfeited or expired (in dollars per share) | $ / shares 0.00  
Nonvested shares outstanding, end of period (in dollars per share) | $ / shares $ 84.27  
Number of Company's Named Executive Officers with stock awards | Officers 3  
Executive award vesting period 8 years  
Stock based compensation expense not yet recognized in income | $ $ 21,900  
Weighted average remaining period for unrecognized stock based compensation 4 years 1 month 21 days