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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
EARNINGS PER SHARE    
Net income $ 27,469 $ 20,017
Dividends declared on Common Stock:    
Undistributed net income for basic earnings per share 22,458 15,699
Weighted average potential dividends on Class A shares upon exercise of dilutive options (24) (17)
Undistributed net income for diluted earnings per share $ 22,434 $ 15,682
Weighted average shares outstanding:    
Effect of dilutive securities on Class A Shares outstanding 98,000 81,000
Weighted average shares outstanding including dilutive securities 21,018,000 20,996,000
Stock option    
Diluted earnings per share:    
Antidilutive stock options (in shares) 4,500  
Stock option | Weighted Average    
Diluted earnings per share:    
Antidilutive stock options (in shares) 4,500  
Class A Common Stock    
EARNINGS PER SHARE    
Cash dividend premium per share (as a percent) 10.00%  
Dividends declared on Common Stock:    
Dividends declared on Common Stock $ (4,517) $ (3,891)
Weighted average shares outstanding:    
Weighted average shares outstanding 18,677,000 18,671,000
Basic earnings per share:    
Per share dividends distributed $ 0.24 $ 0.21
Undistributed earnings per share 1.08 0.76
Total basic earnings per share 1.32 0.97
Diluted earnings per share:    
Per share dividends distributed 0.24 0.21
Undistributed earnings per share 1.08 0.75
Total diluted earnings per share $ 1.32 $ 0.96
Class B Common Stock    
Dividends declared on Common Stock:    
Dividends declared on Common Stock $ (494) $ (427)
Weighted average shares outstanding:    
Weighted average shares outstanding 2,243,000 2,244,000
Basic earnings per share:    
Per share dividends distributed $ 0.22 $ 0.19
Undistributed earnings per share 0.99 0.69
Total basic earnings per share 1.21 0.88
Diluted earnings per share:    
Per share dividends distributed 0.22 0.19
Undistributed earnings per share 0.98 0.69
Total diluted earnings per share $ 1.20 $ 0.88