STOCK OPTIONS - Outstanding and Exercisable (Details) - Stock option - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Options Outstanding
Total Options (in shares)	1,677,645	1,499,795	1,190,295
Weighted-Average Exercise Price (in dollars per share)	$ 13.46	$ 13.11	$ 13.15
Intrinsic Value	$ 11,145,745
Weighted-Average Remaining Life	6 years 7 months 17 days
Options Exercisable
Total Options (in shares)	910,647	768,598
Weighted-Average Exercise Price (in dollars per share)	$ 13.00	$ 12.75
Intrinsic Value	$ 6,465,272
Weighted-Average Remaining Life	5 years 3 months 11 days