Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Summary of Stock Option Activity) (Details)

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EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Summary of Stock Option Activity) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock Options (shares)      
Number of Stock Options, Outstanding beginning balance 188,260    
Number of Stock Options, Granted 0    
Number of Stock Options, Exercised (63,476) (88,409) (60,637)
Number of Stock Options, Forfeited 0    
Number of Stock Options, Expired (3,041)    
Number of Stock Options, Outstanding ending balance 121,743 188,260  
Number of Stock Options, Exercisable 121,743    
Weighted Average Exercise Price      
Weighted Average Exercise Price, Outstanding, beginning balance (in dollars per share) $ 14.94    
Weighted Average Exercise Price, Granted (in dollars per share) 0.00    
Weighted Average Exercise Price, Exercised (in dollars per share) 16.35    
Weighted Average Exercise Price, Forfeited (in dollars per share) 0.00    
Weighted Average Exercise Price, Expired (in dollars per share) 26.10    
Weighted Average Exercise Price, Exercisable (in dollars per share) 13.93    
Weighted Average Exercise Price, Outstanding, beginning balance (in dollars per share) $ 13.93 $ 14.94  
Weighted Average Remaining Contractual Life, Outstanding 1 year 7 months 24 days    
Weighted Average Remaining Contractual Life, Exercisable 1 year 7 months 24 days    
Aggregate Intrinsic Value, Outstanding $ 2,708,076 $ 3,900,000 $ 2,800,000
Aggregate Intrinsic Value, Exercisable $ 2,708,076