SEGMENT REPORTING AND REVENUE INFORMATION (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			2
Segment Reporting Information [Line Items]
Net interest income	$ 198,982	$ 149,538	$ 579,367	$ 441,748
Provision for credit losses	5,500	4,500	17,750	12,500
Non-interest income	32,246	28,774	87,783	86,263
Non-interest expense	111,044	86,819	334,659	257,269
INCOME BEFORE INCOME TAXES	114,684	86,993	314,741	258,242
Goodwill	97,673		97,673		$ 95,674
Total Assets	19,782,481		19,782,481		17,401,165
Operating segments | Banking Business
Segment Reporting Information [Line Items]
Net interest income	196,249	147,828	574,524	432,328
Provision for credit losses	5,500	4,500	17,750	12,500
Non-interest income	10,685	15,741	31,954	46,864
Non-interest expense	98,252	65,076	295,332	190,250
INCOME BEFORE INCOME TAXES	103,182	93,993	293,396	276,442
Goodwill	35,721		35,721		35,721
Total Assets	18,940,271		18,940,271		16,002,714
Operating segments | Securities Business
Segment Reporting Information [Line Items]
Net interest income	6,335	3,377	15,486	14,059
Provision for credit losses	0	0	0	0
Non-interest income	38,298	15,609	103,467	45,169
Non-interest expense	25,138	20,242	74,924	61,169
INCOME BEFORE INCOME TAXES	19,495	(1,256)	44,029	(1,941)
Goodwill	61,952		61,952		59,953
Total Assets	765,295		765,295		1,328,558
Corporate/Eliminations
Segment Reporting Information [Line Items]
Net interest income	(3,602)	(1,667)	(10,643)	(4,639)
Provision for credit losses	0	0	0	0
Non-interest income	(16,737)	(2,576)	(47,638)	(5,770)
Non-interest expense	(12,346)	1,501	(35,597)	5,850
INCOME BEFORE INCOME TAXES	(7,993)	$ (5,744)	(22,684)	$ (16,259)
Goodwill	0		0		0
Total Assets	$ 76,915		$ 76,915		$ 69,893