LOANS, LEASES & ALLOWANCE FOR LOANS AND LEASE LOSSES - UNPAID PRINCIPAL BALANCE FOR PERFORMING AND NONPERFORMING (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 6,877,518	$ 6,402,459
Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	6,842,955	6,370,600
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	34,563	31,859
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,719,038	3,678,520
Mortgage | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,690,893	3,650,120
Mortgage | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	28,145	28,400
Home equity
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	2,412	2,470
Home equity | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	2,365	2,437
Home equity | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	47	33
Warehouse and other
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	480,378	537,714
Warehouse and other | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	480,378	537,714
Warehouse and 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	1,451,535	1,373,216
Multifamily real estate secured | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	1,446,057	1,370,998
Multifamily real estate secured | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	5,478	2,218
Commercial real estate secured
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	155,124	121,746
Commercial real estate secured | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	154,892	121,492
Commercial real estate secured | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	232	254
Auto and RV secured
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	107,430	73,676
Auto and RV secured | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	107,214	73,398
Auto and RV secured | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	216	278
Factoring
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	134,349	98,275
Factoring | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	134,349	98,275
Factoring | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	763,811	514,300
Commercial and Industrial | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	763,811	514,300
Commercial and 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	63,441	2,542
Other | Performing
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	62,996	1,866
Other | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 445	$ 676