LOANS, LEASES & ALLOWANCE FOR LOAN AND LEASE LOSSES - ACTIVITY FOR ALLOWANCE FOR LOAN LOSSES (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period				$ 57,085				$ 49,151	$ 57,085	$ 49,151	$ 40,832
Provision for loan and lease loss	$ 6,500	$ 28,500	$ 4,500	$ 2,700	$ 2,800	$ 19,000	$ 4,950	$ 600	42,200	27,350	25,800
Charged off									(25,833)	(19,663)	(15,979)
Transfers to held for sale									0	(2,356)	(2,307)
Recoveries									2,355	2,603	805
Balance, end of period	$ 75,807				$ 57,085				$ 75,807	$ 57,085	$ 49,151