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EMPLOYEE BENEFIT PLANS - Options, Restricted Stock Awards and Restricted Sock Units (Details) - shares
12 Months Ended
Feb. 22, 2016
Dec. 31, 2016
Dec. 31, 2015
May 31, 2014
Share-based compensation plan        
Maximum term of options   10 years    
2009 Equity Incentive Plan        
Share-based compensation plan        
Shares authorized   180,035    
2014 Equity Incentive Plan        
Share-based compensation plan        
Shares authorized       154,000
Stock Options        
Share-based compensation plan        
Options granted (in shares)   33,500 30,000  
Weighted-average assumptions of fair value of stock options        
Expected dividends (as a percent)   0.98% 0.97%  
Expected term   6 years 4 months 24 days 6 years 4 months 24 days  
Expected volatility (as a percent)   32.95% 34.97%  
Risk-free interest rate (as a percent)   1.47% 1.82%  
Stock Options | 2009 Equity Incentive Plan        
Share-based compensation plan        
Options granted (in shares) 33,500      
Stock Options | 2014 Equity Incentive Plan        
Share-based compensation plan        
Shares authorized       110,000
Stock Options | Directors and officers        
Share-based compensation plan        
Vesting period   3 years    
Stock Options | Minimum | 2009 Equity Incentive Plan        
Share-based compensation plan        
Specified number of share awards allowed before stock repurchases are used to fund additional awards   98,000    
Restricted stock award        
Share-based compensation plan        
Restricted stock granted (in shares)   16,500 20,000  
Restricted stock award | 2009 Equity Incentive Plan        
Share-based compensation plan        
Restricted stock granted (in shares) 16,500      
Restricted stock award | Directors and officers        
Share-based compensation plan        
Vesting period   5 years    
Restricted stock award | Minimum | 2009 Equity Incentive Plan        
Share-based compensation plan        
Specified number of share awards allowed before stock repurchases are used to fund additional awards   39,200    
Restricted stock awards and restricted stock units | 2014 Equity Incentive Plan        
Share-based compensation plan        
Shares authorized       44,000