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EQUITY INCENTIVE PLANS - Options Outstanding and Exercisable (Details)
3 Months Ended
Mar. 31, 2017
$ / shares
shares
2009 and 2014 Equity Plan  
Options Outstanding  
Number Outstanding at the end of the period (in shares) | shares 122,775
Weighted-Average Remaining Contractual Life 6 years 10 months 28 days
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 15.49
Options Exercisable  
Number Exercisable at the end of the period (in shares) | shares 74,477
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 13.78
Weighted Average Exercise Price - $9.33 | 2009 and 2014 Equity Plan  
Options Outstanding  
Number Outstanding at the end of the period (in shares) | shares 8,712
Weighted-Average Remaining Contractual Life 2 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 9.33
Options Exercisable  
Number Exercisable at the end of the period (in shares) | shares 8,712
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 9.33
Weighted Average Exercise Price - $9.55 | 2009 and 2014 Equity Plan  
Options Outstanding  
Number Outstanding at the end of the period (in shares) | shares 9,683
Weighted-Average Remaining Contractual Life 3 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 9.55
Options Exercisable  
Number Exercisable at the end of the period (in shares) | shares 9,683
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 9.55
Weighted Average Exercise Price - $9.58 | 2009 and 2014 Equity Plan  
Options Outstanding  
Number Outstanding at the end of the period (in shares) | shares 8,570
Weighted-Average Remaining Contractual Life 4 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 9.58
Options Exercisable  
Number Exercisable at the end of the period (in shares) | shares 8,570
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 9.58
Weighted Average Exercise Price - $14.00 | 2009 and 2014 Equity Plan  
Options Outstanding  
Number Outstanding at the end of the period (in shares) | shares 15,200
Weighted-Average Remaining Contractual Life 5 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 14.00
Options Exercisable  
Number Exercisable at the end of the period (in shares) | shares 12,850
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 14.00
Weighted Average Exercise Price - $14.98 | 2009 and 2014 Equity Plan  
Options Outstanding  
Number Outstanding at the end of the period (in shares) | shares 17,110
Weighted-Average Remaining Contractual Life 6 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 14.98
Options Exercisable  
Number Exercisable at the end of the period (in shares) | shares 12,446
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 14.98
Weighted Average Exercise Price - $17.55  
Options Outstanding  
Number Outstanding at the end of the period (in shares) | shares 30,000
Weighted-Average Remaining Contractual Life 7 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 17.55
Options Exercisable  
Number Exercisable at the end of the period (in shares) | shares 14,400
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 17.55
Weighted Average Exercise Price - $19.40  
Options Outstanding  
Number Outstanding at the end of the period (in shares) | shares 33,500
Weighted-Average Remaining Contractual Life 8 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 19.40
Options Exercisable  
Number Exercisable at the end of the period (in shares) | shares 7,816
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 19.40