LOANS, LEASES & ALLOWANCE FOR LOANS AND LEASE LOSSES - UNPAID PRINCIPAL BALANCE FOR PERFORMING AND NONPERFORMING (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 6,102,666	$ 5,001,271
Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	6,078,694	4,970,440
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	23,972	30,831
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,541,663	2,980,795
Mortgage | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,523,089	2,957,953
Mortgage | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	18,574	22,842
Home equity
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,156	3,604
Home equity | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,122	3,595
Home equity | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	34	9
Warehouse & other
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	506,031	385,413
Warehouse & other | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	506,031	385,413
Warehouse & other | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Multifamily real estate secured
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	1,276,934	1,185,531
Multifamily real estate secured | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	1,272,206	1,180,132
Multifamily real estate secured | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	4,728	5,399
Commercial real estate secured
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	98,791	61,403
Commercial real estate secured | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	98,419	59,275
Commercial real estate secured | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	372	2,128
Auto and RV secured
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	45,293	13,140
Auto and RV secured | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	45,029	12,687
Auto and RV secured | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	264	453
Factoring
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	145,485	122,200
Factoring | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	145,485	122,200
Factoring | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	480,939	248,584
Commercial & Industrial | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	480,939	248,584
Commercial & Industrial | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Other
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	4,374	601
Other | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	4,374	601
Other | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 0	$ 0