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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator for basic and diluted earnings per share -income available to common shareholders:        
Net income $ 22,736 $ 22,568 $ 47,150 $ 42,382
Denominator for basic earnings per share - weighted average shares 61,543,478 61,194,254 61,471,347 61,115,525
Effect of dilutive securities -        
Employee stock awards 625,031 763,206 649,706 734,493
Warrants 65,513 69,548 66,420 62,348
Denominator for diluted earnings per share - adjusted weighted average shares 62,234,022 62,027,008 62,187,473 61,912,366
Basic $ 0.37 $ 0.37 $ 0.77 $ 0.69
Diluted $ 0.37 $ 0.36 $ 0.76 $ 0.68