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EMPLOYEE BENEFIT PLANS, Restricted Stock Plan (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Additional General Disclosures [Abstract]      
Share-based compensation expense $ 284,000 $ 179,000 $ 200,000
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 150,000    
Number of shares available for grant (in shares) 145,890    
Shares [Roll Forward]      
Outstanding, beginning of year (in shares) 8,269    
Granted (in shares) 4,110    
Forfeited (in shares) (90)    
Increase due to stock dividends (in shares) 0    
Vested (in shares) (3,818)    
Outstanding, end of year (in shares) 8,471 8,269  
Weighted Average Market Price [Roll Forward]      
Outstanding, beginning of year (in dollars per share) $ 49.98    
Granted (in dollars per share) 48.13 $ 49.02 $ 52.82
Forfeited (in dollars per share) 49.26    
Increase due to stock dividends (in dollars per share) 0    
Vested (in dollars per share) 49.95    
Outstanding, end of year (in dollars per share) $ 49.10 $ 49.98  
Additional General Disclosures [Abstract]      
Share-based compensation expense $ 193,000 $ 172,000 $ 157,000
Compensation cost related to nonvested awards that has not yet recognized $ 416,000    
Period over which compensation cost is expected to be recognized 3 years