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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator for basic and diluted earnings per share -income available to common shareholders:        
Net income $ 24,826 $ 22,850 $ 71,976 $ 65,232
Denominator for basic earnings per share - weighted average shares 61,577,619 61,280,283 61,507,160 61,170,845
Effect of dilutive securities -        
Employee stock awards 552,774 740,977 617,128 736,659
Warrants 59,244 64,807 61,586 55,457
Denominator for diluted earnings per share - adjusted weighted average shares 62,189,637 62,086,067 62,185,874 61,962,961
Basic $ 0.40 $ 0.37 $ 1.17 $ 1.07
Diluted $ 0.40 $ 0.37 $ 1.16 $ 1.05