EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 34,641	$ 34,873	$ 24,902	$ 26,751	$ 47,477	$ 51,845	$ 30,628	$ 35,225	$ 121,167	$ 165,175	$ 121,622
Weighted Average Shares (in shares)
Basic Shares (in shares)	32,964,090	32,951,918	32,944,761	34,184,431	34,374,953	34,361,176	34,313,492	28,106,184	33,259,643	32,810,433	27,592,380
Effect of dilutive securities (in shares)	26,348	24,758	28,098	36,827	46,245	39,390	41,878	54,466	25,646	45,801	61,428
Weighted average common shares (diluted) (in shares)	32,990,438	32,976,676	32,972,859	34,221,258	34,421,198	34,400,566	34,355,370	28,160,650	33,285,289	32,856,234	27,653,808
Net Income Available to Common Shareholders per Share (in dollars per share)
Basic EPS (in dollars per share)	$ 1.05	$ 1.06	$ 0.76	$ 0.78	$ 1.38	$ 1.51	$ 0.89	$ 1.25	$ 3.64	$ 5.03	$ 4.41
Effect of Dilutive Securities (in dollars per share)									0	0	(0.01)
Diluted EPS (in dollars per share)	$ 1.05	$ 1.06	$ 0.76	$ 0.78	$ 1.38	$ 1.51	$ 0.89	$ 1.25	$ 3.64	$ 5.03	$ 4.40