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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Basic, numerator:        
NET INCOME $ 19,967 $ 17,208 $ 20,712 $ 12,015
Effect of unvested restricted stock unit awards (207) (848) (231) (602)
Adjusted net income $ 19,760 $ 16,360 $ 20,481 $ 11,413
Basic, denominator:        
Weighted-average shares 26,021,874 26,005,105 26,036,375 25,941,370
Earnings per common share (in dollars per share) $ 0.76 $ 0.63 $ 0.79 $ 0.44
Diluted, numerator:        
NET INCOME $ 19,967 $ 17,208 $ 20,712 $ 12,015
Effect of unvested restricted stock unit awards (203) (848) (227) (602)
Adjusted net income $ 19,764 $ 16,360 $ 20,485 $ 11,413
Diluted, denominator:        
Weighted-average shares 26,021,874 26,005,105 26,036,375 25,941,370
Effect of dilutive securities 571,577   556,240 676
Adjusted weighted-average shares and assumed conversions 26,593,451 26,005,105 26,592,615 25,942,046
Earnings per common share (in dollars per share) $ 0.74 $ 0.63 $ 0.77 $ 0.44