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STOCK-BASED COMPENSATION PLANS (Details) - Equity Incentive Plan - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized to be issued under the plan (in shares) 2,000,000    
Compensation expense      
Recorded compensation costs for the RSAs and RSUs $ 3.1 $ 3.1 $ 2.8
Restricted Stock Awards (RSAs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 47,273 49,290  
Awards cancelled (in shares) 19,742 20,747  
Weighted average grant date fair value (in dollars per share) $ 35.40 $ 36.75  
Restricted Stock Awards (RSAs) | Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   12 months  
Restricted Stock Awards (RSAs) | Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   36 months  
Performance-Based Restricted Stock Unit Awards (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period of award 3 years    
Performance-Based Restricted Stock Unit Awards (RSUs) [Member] | Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 28,594 31,389  
Weighted average grant date fair value (in dollars per share) $ 35.40 $ 36.75  
Performance-Based Restricted Stock Unit Awards (RSUs) [Member] | Officer | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options vested on anniversary date (as a percent) 0.00%    
Performance-Based Restricted Stock Unit Awards (RSUs) [Member] | Officer | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options vested on anniversary date (as a percent) 200.00%    
Restricted Stock Unit Award (RSUs) | Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 48,753    
Awards cancelled (in shares) 24,009 19,735  
Shares issued (in shares)   38,709