BASIS OF PRESENTATION (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share
Net income	$ 34,612	$ 33,710	$ 111,278	$ 84,857
Preferred dividends	0	(13)	0	(39)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 34,612	$ 33,697	$ 111,278	$ 84,818
Weighted average common shares outstanding for basic earnings per share (in shares)	36,692	34,452	35,675	32,520
Assumed incremental common shares issued upon vesting of outstanding restricted stock units (in shares)	143	192	143	187
Weighted average common shares for diluted earnings per share (in shares)	36,835	34,644	35,818	32,707
Earnings per common share — basic (in dollars per share)	$ 0.94	$ 0.98	$ 3.12	$ 2.61
Earnings per common share — diluted (in dollars per share)	$ 0.94	$ 0.97	$ 3.11	$ 2.59
Number of antidilutive common stock equivalents excluded from diluted earnings per share computation (in shares)	8	0	8	0