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STOCK-BASED COMPENSATION PLANS (Details) - Equity Incentive Plan - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-based Compensation        
Shares authorized to be issued under the plan (in shares) 2,000,000      
Compensation expense        
Recorded compensation costs for the RSAs and RSUs   $ 2.8 $ 2.2 $ 1.8
Restricted Stock Awards (RSAs)        
Stock-based Compensation        
Awards granted (in shares) 72,317 61,862    
Awards cancelled (in shares) 16,617 18,452    
Weighted average grant date fair value (in dollars per share) $ 25.17 $ 24.27    
Restricted Stock Awards (RSAs) | Director        
Stock-based Compensation        
Vesting period   12 months    
Restricted Stock Awards (RSAs) | Employees        
Stock-based Compensation        
Vesting period   36 months    
Restricted Stock Unit Award (RSUs)        
Stock-based Compensation        
Expiration period of award   3 years    
Restricted Stock Unit Award (RSUs) | Officer        
Stock-based Compensation        
Awards granted (in shares) 43,659 38,983    
Weighted average grant date fair value (in dollars per share)   $ 25.17 $ 24.28  
Shares issued (in shares) 28,424 0 0  
Restricted Stock Unit Award (RSUs) | Officer | Minimum        
Stock-based Compensation        
Options vested on anniversary date (as a percent)   0.00%    
Restricted Stock Unit Award (RSUs) | Officer | Maximum        
Stock-based Compensation        
Options vested on anniversary date (as a percent)   200.00%