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STOCK COMPENSATION PLANS (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
May 25, 2005
Non-vested shares of Class A Stock under option [Abstract]      
Vesting period for granted option (in years) 1 year    
Options granted term (in years) 10 years    
Weighted-average assumptions used for grants issued [Abstract]      
Expected Dividend Yield (in hundredths) 4.18% 3.99%  
Expected Stock Price Volatility (in hundredths) 25.13% 24.97%  
Weighted Average Risk-Free Interest Rate (in hundredths) 1.87% 3.12%  
Weighted Average Expected Life of Options (in years) 9 years 5 months 19 days 8 years 4 months 10 days  
Base period for calculation of expected dividend yield (in months) 12 months    
Period for risk free interest rate base on treasury constant maturity rate (in years) 10 years    
Total intrinsic value of options exercised $ 135,000    
Unrecognized expense related to non-vested option shares 10,000    
Period over which unvested options cost will recognized (in years) 1 month 6 days    
Class A Stock [Member] | 2005 Equity Compensation Plan [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorizes for new issues     500,000
Compensation expense 24,000 29,000  
Class A Stock [Member] | Stock Options [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at beginning of period, option shares (in shares) 421,500    
Granted, option shares (in shares) 0    
Exercised, option shares (in shares) (18,958)    
Expired, option shares (in shares) 0    
Outstanding at end of period, option shares (in shares) 402,542    
Shares of Class A Non-Voting Common Stock under option [Abstract]      
Outstanding at beginning of period, weighted average exercise price (in dollars per shares) $ 18.30    
Exercised, weighted average exercise price (in dollars per shares) $ 14.76    
Outstanding at end of period, weighted average exercise price (in dollars per shares) $ 18.47    
Options exercisable at end of period, weighted average exercise price (in dollars per shares) $ 18.42    
Outstanding at end of period, weighted average remaining life (in years) 4 years 4 months 28 days    
Options exercisable at end of period, weighted average remaining life (in years) 3 years 11 months 23 days    
Outstanding at end of period, aggregate intrinsic value 1,612,000    
Options exercisable at end of period, aggregate intrinsic value $ 1,495,000    
Options exercisable at end of period, option share (in shares) 368,792    
Share Based Compensation Arrangement By Share Based Payment Award Nonvested Options Outstanding [Roll Forward]      
Granted, option shares (in shares) 0    
Class A Stock [Member] | Non-Vested Stock Option [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted, option shares (in shares) 0    
Share Based Compensation Arrangement By Share Based Payment Award Nonvested Options Outstanding [Roll Forward]      
Outstanding at beginning of period, Non-vested option shares (in shares) 33,750    
Granted, option shares (in shares) 0    
Vested, option shares (in shares) 0    
Canceled, option shares (in shares) 0    
Outstanding at end of period, Non-vested option shares (in shares) 33,750    
Non-vested shares of Class A Stock under option [Abstract]      
Outstanding at beginning of period, weighted average grant - date fair value per option (in dollars per shares) $ 2.92    
Granted, weighted average grant - date fair value per option (in dollars per shares) $ 0    
Vested, weighted average grant - date fair value per option (in dollars per shares) $ 0    
Canceled, weighted average grant - date fair value per option (in dollars per shares) $ 0    
Outstanding at end of period, weighted average grant - date fair value per option (in dollars per shares) $ 2.92