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STOCK COMPENSATION PLANS (Details)
 12 Months Ended
Dec. 18, 2015
$ / shares
shares
Dec. 31, 2015
USD ($)
Director
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Dec. 09, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorizes under the plan (in shares) | shares         331,500
Shares issued as fully vested unrestricted stock awards | shares 5,000        
Fair market value $ 27.38        
Number of directors in committee | Director   3      
Weighted Average Exercise [Abstract]          
Fair value of options granted (in dollars per shares)   $ 3.95 $ 4.04    
Total intrinsic value of options exercised | $   $ 379,000 $ 247,000 $ 367,000  
Received cash from the exercise of options | $   2,100,000      
Tax benefit realized during the period | $   $ 379,000      
$15.26 - $19.04 [Member] | Employee and director [Member]          
Options Outstanding [Abstract]          
Range of Exercise Price, Minimum (in dollars per shares)   $ 15.26      
Range of Exercise Price, Maximum (in dollars per shares)   $ 19.04      
Shares Outstanding (in shares) | shares   135,000      
Weighted Average Remaining Life   4 years 1 month 13 days      
Weighted Average Exercise Price (in dollars per shares)   $ 17.83      
Aggregate Intrinsic Value | $   $ 1,332,788      
Options Exercisable [Abstract]          
Range of Exercise Price, Minimum (in dollars per shares)   $ 15.26      
Range of Exercise Price, Maximum (in dollars per shares)   $ 19.04      
Shares Exercisable (in shares) | shares   135,000      
Weighted Average Remaining Life   4 years 1 month 13 days      
Weighted Average Exercise Price (in dollars per shares)   $ 17.83      
Aggregate Intrinsic Value | $   $ 1,332,788      
$19.05 - $22.66 [Member] | Employee and director [Member]          
Options Outstanding [Abstract]          
Range of Exercise Price, Minimum (in dollars per shares)   $ 19.05      
Range of Exercise Price, Maximum (in dollars per shares)   $ 22.66      
Shares Outstanding (in shares) | shares   135,000      
Weighted Average Remaining Life   5 years 6 months 22 days      
Weighted Average Exercise Price (in dollars per shares)   $ 20.87      
Aggregate Intrinsic Value | $   $ 923,096      
Options Exercisable [Abstract]          
Range of Exercise Price, Minimum (in dollars per shares)   $ 19.05      
Range of Exercise Price, Maximum (in dollars per shares)   $ 22.66      
Shares Exercisable (in shares) | shares   135,000      
Weighted Average Remaining Life   5 years 6 months 22 days      
Weighted Average Exercise Price (in dollars per shares)   $ 20.86      
Aggregate Intrinsic Value | $   $ 923,096      
Class A Stock [Member] | Stock Options [Member]          
Shares [Abstract]          
Outstanding at beginning of year (in shares) | shares   376,250 387,000 421,500  
Granted (in shares) | shares   0 33,750 33,750  
Exercised (in shares) | shares   (106,250) (44,500) (68,250)  
Expired (in shares) | shares   0 0 0  
Outstanding at end of year (in shares) | shares   270,000 376,250 387,000  
Options exercisable at year end (in shares) | shares   270,000 342,500 353,250  
Weighted Average Exercise [Abstract]          
Outstanding at beginning of year (in dollars per shares)   $ 19.52 $ 18.96 $ 18.30  
Granted (in dollars per shares)   0 21.86 22.66  
Exercised (in dollars per shares)   19.97 16.45 16.68  
Expired (in dollars per shares)   0 0 0  
Outstanding at end of year (in dollars per shares)   19.34 19.52 18.96  
Options exercisable at year end (in dollars per shares)   $ 19.34 $ 19.29 $ 18.61