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STOCK PLANS AND STOCK BASED COMPENSATION (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
STOCK PLANS AND STOCK BASED COMPENSATION      
Number of shares available for grant permitted by plan 3,000,000    
Information related to stock option and restricted stock awards granted      
Expenses $ 410,000 $ 261,000  
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures)      
2017 774,000    
2018 483,000    
2019 155,000    
2020 40,000    
2021 3,000    
Total $ 1,455,000    
Class B Common Stock      
STOCK PLANS AND STOCK BASED COMPENSATION      
Number of shares available for grant permitted by plan 0    
Minimum      
STOCK PLANS AND STOCK BASED COMPENSATION      
Vesting period 3 years    
Stock option      
STOCK PLANS AND STOCK BASED COMPENSATION      
Exercisable period 1 year    
Information related to the stock option plan      
Intrinsic value of options exercised $ 44,000 16,000  
Cash received from options exercised, net of shares redeemed 33,000 55,000  
Information related to stock option and restricted stock awards granted      
Expenses 63,000 $ 62,000  
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures)      
2017 191,000    
2018 251,000    
2019 143,000    
2020 32,000    
2021 1,000    
Total $ 618,000    
Stock option | Class A Common Stock      
Options      
Outstanding, beginning of year (in shares) 312,600 323,400 323,400
Granted (in shares)     5,000
Exercised (in shares) (2,000)   (4,000)
Forfeited or expired (in shares)     (11,800)
Outstanding, end of year (in shares) 310,600   312,600
Fully vested and unvested (in shares) 310,600    
Exercisable (vested) at end of year (in shares) 2,000    
Weighted Average Exercise Price      
Outstanding, beginning of year (in dollars per share) $ 24.49 $ 24.40 $ 24.40
Granted (in dollars per share)     26.43
Exercised (in dollars per share) 16.61   20.12
Forfeited or expired (in dollars per share)     24.47
Outstanding, end of year (in dollars per share) 24.54   $ 24.49
Fully vested and unvested (in dollars per share) 24.54    
Exercisable (vested) at end of year (in dollars per share) $ 24.93    
Weighted Average Remaining Contractual Term      
Outstanding, end of year 3 years 6 months 18 days   3 years 9 months 7 days
Fully vested and unvested 3 years 6 months 18 days    
Exercisable (vested) at end of year 1 month 10 days    
Aggregate Intrinsic Value      
Outstanding, end of year $ 3,060,357   $ 4,705,807
Fully vested and unvested 3,060,357    
Exercisable (vested) at end of year $ 18,920    
Stock option | Minimum      
STOCK PLANS AND STOCK BASED COMPENSATION      
Exercisable period 5 years    
Stock option | Maximum      
STOCK PLANS AND STOCK BASED COMPENSATION      
Exercisable period 6 years    
Restricted Stock Awards      
Shares      
Outstanding, beginning of year (in shares) 77,000 79,000 79,000
Granted (in shares) 4,803    
Forfeited (in shares)     (2,000)
Earned and issued (in shares) (3,702)    
Outstanding, end of year (in shares) 78,101   77,000
Fully vested and unvested (in shares) 78,101    
Weighted-average grant date fair value      
Outstanding, beginning of year (in dollars per share) $ 20.02 $ 20.02 $ 20.02
Granted (in dollars per share) 35.12    
Forfeited (in dollars per share)     19.85
Earned and issued (in dollars per share) 37.54    
Outstanding, end of year (in dollars per share) 20.27   $ 20.02
Fully vested and unvested (in dollars per share) $ 20.27    
Information related to stock option and restricted stock awards granted      
Expenses $ 215,000 $ 72,000  
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures)      
2017 187,000    
2018 12,000    
2019 12,000    
2020 8,000    
2021 2,000    
Total $ 221,000    
Restricted Stock Awards | Minimum      
STOCK PLANS AND STOCK BASED COMPENSATION      
Vesting period 5 years    
Restricted Stock Awards | Maximum      
STOCK PLANS AND STOCK BASED COMPENSATION      
Vesting period 6 years    
Performance Stock Units      
STOCK PLANS AND STOCK BASED COMPENSATION      
Vesting period 4 years    
Shares      
Outstanding, beginning of year (in shares) 55,000    
Granted (in shares)     55,000
Outstanding, end of year (in shares) 55,000   55,000
Fully vested and unvested (in shares) 55,000    
Weighted-average grant date fair value      
Outstanding, beginning of year (in dollars per share) $ 23.13    
Granted (in dollars per share)     $ 23.13
Outstanding, end of year (in dollars per share) 23.13   $ 23.13
Fully vested and unvested (in dollars per share) $ 23.13    
Information related to stock option and restricted stock awards granted      
Expenses $ 132,000 $ 127,000  
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures)      
2017 396,000    
2018 220,000    
Total $ 616,000    
Performance Stock Units | Tranche One      
Information related to stock option and restricted stock awards granted      
Return on average assets (as a percent) 1.25%    
Vesting rights (as a percent) 50.00%    
Performance Stock Units | Tranche Two      
Information related to stock option and restricted stock awards granted      
Return on average assets (as a percent) 1.25%    
Vesting rights (as a percent) 50.00%