SHARE BASED COMPENSATION (Summary of Share Option Activity) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Number of Common Shares
Beginning balance	87,300
Granted	16,212
Exercised	(12,353)	(17,362)
Forfeited or expired	0
Ending balance	91,159
Exercisable, Common Shares	44,462
Weighted Average Exercise Share Price
Beginning balance	$ 26.22
Granted	38.15
Exercised	18.78
Ending balance	29.35
Exercisable Weighted Average Exercise Price	23.44
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 4 months 24 days
Exercisable at end of period	2 years 10 months 24 days
Beginning balance	$ 1,160
Exercised	249
Ending balance	904
Exercisable, Intrinsic Value	$ 904