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EARNINGS PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator for basic and diluted earnings per share -income available to common shareholders:    
Net income $ 30,506 $ 24,414
Denominator for basic earnings per share - weighted average shares 61,654,686 61,398,414
Effect of dilutive securities -    
Employee stock awards 464,254 674,589
Warrants 61,804 67,381
Denominator for diluted earnings per share - adjusted weighted average shares 62,180,744 62,140,384
Basic $ 0.49 $ 0.40
Diluted $ 0.49 $ 0.39