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, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock Options (shares)      
Number of Stock Options, Outstanding beginning balance 422,138    
Number of Stock Options, Exercised (46,278) (56,619) (72,743)
Number of Stock Options, Forfeited (4,582)    
Number of Stock Options, Expired (22,618)    
Number of Stock Options, Outstanding ending balance 348,660 422,138  
Number of Stock Options, Exercisable 317,237    
Weighted Average Exercise Price      
Weighted Average Exercise Price, Outstanding, beginning balance (in dollars per share) $ 32.48    
Weighted Average Exercise Price, Exercised (in dollars per share) 22.04    
Weighted Average Exercise Price, Forfeited (in dollars per share) 31.83    
Weighted Average Exercise Price, Expired (in dollars per share) 33.40    
Weighted Average Exercise Price, Outstanding, beginning balance (in dollars per share) 33.81 $ 32.48  
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 34.00    
Weighted Average Remaining Contractual Life, Outstanding 1 year 9 months 3 days    
Weighted Average Remaining Contractual Life, Exercisable 1 year 7 months 17 days    
Aggregate Intrinsic Value, Outstanding $ 798,340 $ 2,300,000 $ 656,000
Aggregate Intrinsic Value, Exercisable $ 764,501