LOANS, LEASES & ALLOWANCE FOR LOANS AND LEASE LOSSES - NONPERFORMING LOANS (Details) - Nonperforming - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-performing loans and leases secured by real estate	$ 33,902	$ 30,905
Total non-performing loans and leases	$ 34,563	$ 31,859
Nonperforming loans to total loans, percent	0.50%	0.50%
Mortgage | In-house originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-performing loans and leases	$ 22,814	$ 22,958
Mortgage | Purchased
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-performing loans and leases	5,331	5,442
Home equity | In-house originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-performing loans and leases	47	33
Multifamily real estate secured | In-house originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-performing loans and leases	4,164	791
Multifamily real estate secured | Purchased
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-performing loans and leases	1,314	1,427
Commercial real estate secured | Purchased
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-performing loans and leases	232	254
Auto and RV secured
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-performing loans and leases	216	278
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total non-performing loans and leases	$ 445	$ 676