LOANS & ALLOWANCE FOR CREDIT LOSSES - PAST DUE LOANS (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020
Financing Receivable, Past Due [Line Items]
Total	$ 188,282	$ 122,355
As a % of total gross loans and leases	1.59%	1.13%
Single Family - Mortgage & Warehouse
Financing Receivable, Past Due [Line Items]
Total	$ 115,336	$ 107,859
Multifamily and Commercial Mortgage
Financing Receivable, Past Due [Line Items]
Total	33,217	13,031
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	35,164	0
Commercial & Industrial - Non-RE
Financing Receivable, Past Due [Line Items]
Total	2,960	0
Auto & Consumer
Financing Receivable, Past Due [Line Items]
Total	1,605	1,465
Other
Financing Receivable, Past Due [Line Items]
Total	0	0
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	$ 27,398	$ 26,648
As a % of total gross loans and leases	0.23%	0.25%
30-59 Days Past Due | Single Family - Mortgage & Warehouse
Financing Receivable, Past Due [Line Items]
Total	$ 19,348	$ 17,931
30-59 Days Past Due | Multifamily and Commercial Mortgage
Financing Receivable, Past Due [Line Items]
Total	6,952	7,744
30-59 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	0	0
30-59 Days Past Due | Commercial & Industrial - Non-RE
Financing Receivable, Past Due [Line Items]
Total	0	0
30-59 Days Past Due | Auto & Consumer
Financing Receivable, Past Due [Line Items]
Total	1,098	973
30-59 Days Past Due | Other
Financing Receivable, Past Due [Line Items]
Total	0	0
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	$ 13,402	$ 28,568
As a % of total gross loans and leases	0.11%	0.27%
60-89 Days Past Due | Single Family - Mortgage & Warehouse
Financing Receivable, Past Due [Line Items]
Total	$ 12,367	$ 23,115
60-89 Days Past Due | Multifamily and Commercial Mortgage
Financing Receivable, Past Due [Line Items]
Total	859	5,287
60-89 Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	0	0
60-89 Days Past Due | Commercial & Industrial - Non-RE
Financing Receivable, Past Due [Line Items]
Total	0	0
60-89 Days Past Due | Auto & Consumer
Financing Receivable, Past Due [Line Items]
Total	176	166
60-89 Days Past Due | Other
Financing Receivable, Past Due [Line Items]
Total	0	0
90 Plus Days Past Due
Financing Receivable, Past Due [Line Items]
Total	$ 147,482	$ 67,139
As a % of total gross loans and leases	1.24%	0.63%
90 Plus Days Past Due | Single Family - Mortgage & Warehouse
Financing Receivable, Past Due [Line Items]
Total	$ 83,621	$ 66,813
90 Plus Days Past Due | Multifamily and Commercial Mortgage
Financing Receivable, Past Due [Line Items]
Total	25,406	0
90 Plus Days Past Due | Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	35,164	0
90 Plus Days Past Due | Commercial & Industrial - Non-RE
Financing Receivable, Past Due [Line Items]
Total	2,960	0
90 Plus Days Past Due | Auto & Consumer
Financing Receivable, Past Due [Line Items]
Total	331	326
90 Plus Days Past Due | Other
Financing Receivable, Past Due [Line Items]
Total	$ 0	$ 0