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STOCK BASED COMPENSATION - NONVESTED SHARES (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
2005 Restricted Stock Grant Plan | Restricted stock      
Stock Based Compensation      
Number of shares authorized for issuance 50,000    
Shares available for issuance 0    
Shares      
Nonvested at the beginning of the period (in shares) 17,551    
Granted (in shares) 0 5,385  
Vested (in shares) (5,999)    
Forfeited (in shares) (916) (88)  
Nonvested at the end of the period (in shares) 10,636 17,551  
Weighted-Average Grant-Date Fair Value      
Nonvested shares, balance at the beginning of the period (in dollars) $ 404,351    
Vested (in dollars) (128,453)    
Forfeited (in dollars) (22,380)    
Nonvested shares, balance at the end of the period (in dollars) $ 253,518 $ 404,351  
Fair Value Per Share      
Nonvested shares, balance at the beginning of the period (in dollars per share) $ 23.04    
Vested (in dollars per share) 21.41    
Forfeited (in dollars per share) (24.43)    
Nonvested shares, balance at the end of the period (in dollars per share) $ 23.84 $ 23.04  
Additional disclosures      
Total unrecognized compensation cost related to nonvested shares granted $ 160,000    
Period over which cost is expected to be recognized 2 years 4 months 24 days    
Fair value of shares vested (in dollars) $ 128,000 $ 105,000 $ 88,000
2009 Stock Award Plan      
Stock Based Compensation      
Number of shares authorized for issuance 150,000    
Shares      
Nonvested at the beginning of the period (in shares) 1,945    
Granted (in shares) 6,170 1,465  
Vested (in shares) (553)    
Forfeited (in shares) (265) 0  
Nonvested at the end of the period (in shares) 7,297 1,945  
Weighted-Average Grant-Date Fair Value      
Nonvested shares, balance at the beginning of the period (in dollars) $ 54,024    
Granted (in dollars) (182,941)    
Vested (in dollars) (15,255)    
Forfeited (in dollars) (7,857)    
Nonvested shares, balance at the end of the period (in dollars) $ 213,853 $ 54,024  
Fair Value Per Share      
Nonvested shares, balance at the beginning of the period (in dollars per share) $ 27.78    
Granted (in dollars per share) 29.65    
Vested (in dollars per share) 27.59    
Forfeited (in dollars per share) (29.65)    
Nonvested shares, balance at the end of the period (in dollars per share) $ 29.31 $ 27.78  
Additional disclosures      
Total unrecognized compensation cost related to nonvested shares granted $ 172,000    
Period over which cost is expected to be recognized 3 years 10 months 24 days    
Fair value of shares vested (in dollars) $ 15,000 $ 6,000 $ 4,000
2009 Stock Award Plan | Restricted stock      
Stock Based Compensation      
Shares available for issuance 142,000