LOANS, LEASES & ALLOWANCE FOR LOANS AND LEASE LOSSES - ALLOWANCE FOR LOAN LOSS BY PORTFOLIO SEGMENT (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Mar. 31, 2017	Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, general allowance		$ 651	$ 692
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, specific allowance		0	0
Ending allowance balance attributable to loans and leases, collectively evaluated for impairment		45,336	35,134
Total ending allowance balance		45,987	35,826
Loans and leases individually evaluated for impairment	[1]	33,301	32,069
Loans and leases collectively evaluated for impairment		7,062,457	6,370,390
Principal loan and lease balance		7,095,758	6,402,459
Unaccreted discounts and loan and lease fees		(29,071)	(11,954)
Accrued interest receivable		19,278	22,831
Total recorded investment in loans and leases		$ 7,085,965	$ 6,413,336
Threshold period for TDRs to be considered performing		6 months	6 months
Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, general allowance		$ 586	$ 621
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, specific allowance		0	0
Ending allowance balance attributable to loans and leases, collectively evaluated for impairment		18,980	18,045
Total ending allowance balance		19,566	18,666
Loans and leases individually evaluated for impairment	[1]	28,418	28,610
Loans and leases collectively evaluated for impairment		3,781,285	3,649,910
Principal loan and lease balance		3,809,703	3,678,520
Unaccreted discounts and loan and lease fees		11,066	13,142
Accrued interest receivable		8,398	12,460
Total recorded investment in loans and leases		3,829,167	3,704,122
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, general allowance		1	1
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, specific allowance		0	0
Ending allowance balance attributable to loans and leases, collectively evaluated for impairment		22	22
Total ending allowance balance		23	23
Loans and leases individually evaluated for impairment	[1]	44	33
Loans and leases collectively evaluated for impairment		2,586	2,437
Principal loan and lease balance		2,630	2,470
Unaccreted discounts and loan and lease fees		29	24
Accrued interest receivable		3	2
Total recorded investment in loans and leases		2,662	2,496
Warehouse and other
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, general allowance		0	0
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, specific allowance		0	0
Ending allowance balance attributable to loans and leases, collectively evaluated for impairment		2,133	2,685
Total ending allowance balance		2,133	2,685
Loans and leases individually evaluated for impairment	[1]	0	0
Loans and leases collectively evaluated for impairment		391,010	537,714
Principal loan and lease balance		391,010	537,714
Unaccreted discounts and loan and lease fees		(1,865)	(2,200)
Accrued interest receivable		1,504	1,870
Total recorded investment in loans and leases		390,649	537,384
Multifamily real estate secured
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, general allowance		19	1
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, specific allowance		0	0
Ending allowance balance attributable to loans and leases, collectively evaluated for impairment		4,362	3,937
Total ending allowance balance		4,381	3,938
Loans and leases individually evaluated for impairment	[1]	4,363	2,218
Loans and leases collectively evaluated for impairment		1,568,631	1,370,998
Principal loan and lease balance		1,572,994	1,373,216
Unaccreted discounts and loan and lease fees		4,746	3,957
Accrued interest receivable		4,862	5,409
Total recorded investment in loans and leases		1,582,602	1,382,582
Commercial real estate secured
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, general allowance		0	0
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, specific allowance		0	0
Ending allowance balance attributable to loans and leases, collectively evaluated for impairment		989	882
Total ending allowance balance		989	882
Loans and leases individually evaluated for impairment	[1]	0	254
Loans and leases collectively evaluated for impairment		155,621	121,492
Principal loan and lease balance		155,621	121,746
Unaccreted discounts and loan and lease fees		747	542
Accrued interest receivable		385	389
Total recorded investment in loans and leases		156,753	122,677
Auto and RV secured
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, general allowance		1	2
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, specific allowance		0	0
Ending allowance balance attributable to loans and leases, collectively evaluated for impairment		2,144	1,613
Total ending allowance balance		2,145	1,615
Loans and leases individually evaluated for impairment	[1]	198	278
Loans and leases collectively evaluated for impairment		130,865	73,398
Principal loan and lease balance		131,063	73,676
Unaccreted discounts and loan and lease fees		1,745	975
Accrued interest receivable		246	169
Total recorded investment in loans and leases		133,054	74,820
Factoring
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, general allowance		0	0
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, specific allowance		0	0
Ending allowance balance attributable to loans and leases, collectively evaluated for impairment		379	245
Total ending allowance balance		379	245
Loans and leases individually evaluated for impairment	[1]	0	0
Loans and leases collectively evaluated for impairment		151,319	98,275
Principal loan and lease balance		151,319	98,275
Unaccreted discounts and loan and lease fees		(46,221)	(30,533)
Accrued interest receivable		198	327
Total recorded investment in loans and leases		105,296	68,069
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, general allowance		0	0
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, specific allowance		0	0
Ending allowance balance attributable to loans and leases, collectively evaluated for impairment		9,493	7,630
Total ending allowance balance		9,493	7,630
Loans and leases individually evaluated for impairment	[1]	0	0
Loans and leases collectively evaluated for impairment		868,279	514,300
Principal loan and lease balance		868,279	514,300
Unaccreted discounts and loan and lease fees		758	2,172
Accrued interest receivable		3,679	2,202
Total recorded investment in loans and leases		872,716	518,674
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, general allowance		44	67
Ending allowance balance attributable to loans and leases, individually evaluated for impairment, specific allowance		0	0
Ending allowance balance attributable to loans and leases, collectively evaluated for impairment		6,834	75
Total ending allowance balance		6,878	142
Loans and leases individually evaluated for impairment	[1]	278	676
Loans and leases collectively evaluated for impairment		12,861	1,866
Principal loan and lease balance		13,139	2,542
Unaccreted discounts and loan and lease fees		(76)	(33)
Accrued interest receivable		3	3
Total recorded investment in loans and leases		$ 13,066	$ 2,512

[1] Loans and leases evaluated for impairment include Troubled Debt Restructurings (“TDRs”) that have been performing for more than six months