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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator for basic and diluted earnings per share -income available to common shareholders:
Net income	$ 51,520	$ 50,888	$ 92,821	$ 98,203
Denominator for basic earnings per share - weighted average shares	93,555,131	96,123,645	93,470,005	96,496,720
Effect of dilutive securities -
Employee stock awards	894,686	886,067	887,387	869,920
Denominator for diluted earnings per share - adjusted weighted average shares	94,449,817	97,009,712	94,357,392	97,366,640
Basic	$ 0.55	$ 0.53	$ 0.99	$ 1.02
Diluted	$ 0.55	$ 0.52	$ 0.98	$ 1.01