EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Common Share
Net income	$ 54,785	$ 41,295	$ 107,807	$ 82,081
Preferred stock dividends	(26)	(78)	(103)	(155)
Preferred stock redemption charge	(87)	0	(87)	0
Net income attributable to common stockholders	$ 54,672	$ 41,217	$ 107,617	$ 81,926
Average common shares outstanding (in shares)	59,049,697	61,315,590	59,278,672	61,281,127
Total qualifying shares (in shares)	59,049,697	61,315,590	59,278,672	61,281,127
Basic earnings per common share (in dollars per share)	$ 0.93	$ 0.67	$ 1.82	$ 1.34
Diluted Earnings Per Common Share
Dilutive net income attributable to common stockholders	$ 54,672	$ 41,217	$ 107,617	$ 81,926
Average common shares issued and outstanding (in shares)	59,049,697	61,315,590	59,278,672	61,281,127
Total dilutive common shares outstanding (in shares)	60,040,723	61,938,988	60,196,516	61,900,633
Diluted earnings per common share (in dollars per share)	$ 0.91	$ 0.67	$ 1.79	$ 1.32
RSUs
Diluted Earnings Per Common Share
Dilutive effect of average unvested RSUs (in shares)	991,026	623,398	917,844	619,506