STOCK-BASED COMPENSATION, STOCK OPTION ACTIVITY (Details) - Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Options
Outstanding at beginning of period (in shares)	24,669	83,861	99,810
Granted (in shares)	0	0	0
Exercised (in shares)	(3,398)	(51,390)	(13,449)
Expired (in shares)	(1,006)	(7,802)	(2,500)
Outstanding at end of period (in shares)	20,265	24,669	83,861
Exercisable at end of period (in shares)	20,265	22,924	75,072
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 12.17	$ 12.39	$ 12.16
Granted (in dollars per shares)	0.00	0.00	0.00
Exercised (in dollars per share)	14.94	11.53	11.31
Expired (in dollars per share)	17.88	18.76	9.00
Outstanding at end of period (in dollars per share)	11.42	12.17	12.39
Exercisable at end of period (in dollars per share)	$ 11.42	$ 12.13	$ 12.40