EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 47,477	$ 51,845	$ 30,628	$ 35,225	$ 29,934	$ 33,015	$ 31,118	$ 27,555	$ 165,175	$ 121,622	$ 87,204
Weighted Average Shares (in shares)
Basic Shares (in shares)	34,374,953	34,361,176	34,313,492	28,106,184	27,815,437	27,537,841	27,526,653	27,486,573	32,810,433	27,592,380	27,294,028
Effect of dilutive securities (in shares)	46,245	39,390	41,878	54,466	58,576	63,499	54,525	67,381	45,801	61,428	78,076
Weighted average common shares (diluted) (in shares)	34,421,198	34,400,566	34,355,370	28,160,650	27,874,013	27,601,340	27,581,178	27,553,954	32,856,234	27,653,808	27,372,104
Net Income Available to Common Shareholders per Share (in dollars per share)
Basic EPS (in dollars per share)	$ 1.38	$ 1.51	$ 0.89	$ 1.25	$ 1.08	$ 1.20	$ 1.13	$ 1.00	$ 5.03	$ 4.41	$ 3.19
Effect of Dilutive Securities (in dollars per share)									0	(0.01)	0
Diluted EPS (in dollars per share)	$ 1.38	$ 1.51	$ 0.89	$ 1.25	$ 1.07	$ 1.20	$ 1.13	$ 1.00	$ 5.03	$ 4.40	$ 3.19