EMPLOYEE BENEFITS - Options Activity (Details) - Employee And Directors Time Based Options - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of Options
Shares under option, beginning balance (in shares)	894,015	1,081,901
Shares granted (in shares)	82,000	237,500
Shares forfeited or expired (in shares)	(42,361)	(111,926)
Shares exercised (in shares)	(50,773)	(313,460)
Shares under option, ending balance (in shares)	882,881	894,015	1,081,901
Shares exercisable, number of options (in shares)	497,868	493,241
Weighted- Average Exercise Price
Shares under option, beginning balance (in dollars per share)	$ 9.66	$ 9.82
Shares granted (in dollars per share)	17.54	9.51
Shares forfeited or expired (in dollars per share)	10.39	10.33
Shares exercised (in dollars per share)	9.70	9.72
Shares under option, ending balance (in dollars per share)	10.36	9.66	$ 9.82
Shares exercisable, weighted-average exercise price (in dollars per share)	$ 9.14	$ 8.79
Average Remaining Contractual Term (In Years)
Shares under option	5 years 5 months	5 years 10 months 24 days	3 years 10 months 24 days
Shares exercisable	2 years 11 months	3 years 3 months 18 days