SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Distributed earnings allocated to common stockholders									$ 6,439	$ 4,016	$ 0
Undistributed earnings allocated to common stockholders									34,408	34,421	18,280
Net income available to common stockholders	$ 14,148	$ 15,627	$ 1,308	$ 9,764	$ 10,580	$ 11,663	$ 8,130	$ 8,064	$ 40,847	$ 38,437	$ 18,280
Weighted average number of common shares outstanding									31,762	25,974	23,918
Effect of dilutive restricted grants									244	15	378
Effect of dilutive options									121	270	169
Weighted average number of common shares outstanding used to calculate diluted earnings per share									32,127	26,259	24,348