SHARE BASED COMPENSATION (Summary of Share Option Activity) (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Number of Common Shares
Beginning balance	87,300
Granted	16,212
Exercised	(17,927)	(27,284)
Forfeited or expired	(482)
Ending balance	85,103
Exercisable, Common Shares	54,958
Weighted Average Exercise Share Price
Beginning balance	$ 26.22
Granted	38.15
Exercised	20.65
Ending balance	29.6
Exercisable Weighted Average Exercise Price	25.46
Weighted average fair value of options granted during the year	$ 11.73	$ 13.42
Weighted Average Contractual Remaining Life(Years)
Balance at end of period	4 years 2 months
Exercisable at end of period	3 years 1 month
Beginning balance	$ 1,160
Exercised	337
Ending balance	989
Exercisable, Intrinsic Value	$ 860