Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Summary of Nonvested Stock Activity) (Details)

v3.8.0.1
EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Summary of Nonvested Stock Activity) (Details)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Restricted Stock  
Number of Shares of RSAs  
Beginning balance (in shares) | shares 371,438
Granted (in shares) | shares 125,738
Net settle for taxes (in shares) | shares (47,187)
Vested (in shares) | shares (110,057)
Forfeited (in shares) | shares (13,196)
Ending balance (in shares) | shares 326,736
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares $ 23.70
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares 35.89
Weighted Average Grant Date Fair Value, Net settle for taxes (in dollars per share) | $ / shares 37.80
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares 24.93
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares 26.55
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares $ 27.68
Performance Stock  
Number of Shares of RSAs  
Beginning balance (in shares) | shares 145,757
Granted (in shares) | shares 37,249
Vested (in shares) | shares 0
Forfeited (in shares) | shares (48,656)
Ending balance (in shares) | shares 134,350
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares $ 21.05
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares 39.31
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares 0.00
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares 24.19
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares $ 24.98