LOANS, LEASES & ALLOWANCE FOR LOAN AND LEASE LOSSES - ALLOWANCE FOR LOAN LOSS BY PORTFOLIO CLASS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 59,227	$ 50,120	$ 57,085	$ 49,151
Provision for loan and lease losses	4,500	4,950	7,200	5,550
Charge-offs	(5,386)	(2,200)	(6,463)	(3,425)
Recoveries	1,173	836	1,692	2,430
Balance, end of period	59,514	53,706	59,514	53,706
Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	20,573	21,709	21,295	20,382
Provision for loan and lease losses	(264)	1,276	(1,088)	2,206
Charge-offs	(145)	(739)	(151)	(740)
Recoveries	70	3	178	401
Balance, end of period	20,234	22,249	20,234	22,249
Warehouse
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,140	496	996	523
Provision for loan and lease losses	288	119	432	92
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	1,428	615	1,428	615
Financing
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	3,741	1,433	5,331	1,557
Provision for loan and lease losses	(150)	1,289	(1,740)	1,165
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	3,591	2,722	3,591	2,722
Multifamily secured - mortgage and financing
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,308	4,926	4,097	5,010
Provision for loan and lease losses	(105)	(93)	1,106	(286)
Charge-offs	0	0	0	0
Recoveries	119	0	119	109
Balance, end of period	5,322	4,833	5,322	4,833
Commercial real estate secured - mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,104	855	1,044	849
Provision for loan and lease losses	87	119	147	125
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	1,191	974	1,191	974
Auto and RV secured
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	4,927	3,615	4,818	3,178
Provision for loan and lease losses	404	670	712	1,292
Charge-offs	(344)	(311)	(619)	(544)
Recoveries	77	39	153	87
Balance, end of period	5,064	4,013	5,064	4,013
Commercial & Industrial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	20,719	15,885	17,514	16,282
Provision for loan and lease losses	2,175	(155)	5,380	48
Charge-offs	(4,132)	(549)	(4,132)	(1,149)
Recoveries	0	0	0	0
Balance, end of period	18,762	15,181	18,762	15,181
Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,715	1,201	1,990	1,370
Provision for loan and lease losses	2,065	1,725	2,251	908
Charge-offs	(765)	(601)	(1,561)	(992)
Recoveries	907	794	1,242	1,833
Balance, end of period	$ 3,922	$ 3,119	$ 3,922	$ 3,119