Leases - Supplemental information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Lessee, Lease, Description [Line Items]
Lease expense	$ 866,000	$ 825,000
Consolidated Statements of Condition:
Premises and equipment - Operating lease right of use assets	2,117	2,525
Consolidated Statements of Operations:
Premises and occupancy expenses from operating leases	797	768
Equipment expenses from operating leases	69	57
Consolidated Statements of Cash Flows:
Operating cash flows for operating leases, net	905	1,035
Accounts Payable and Accrued Liabilities [Member]
Consolidated Statements of Condition:
Accounts payable, accrued interest and other liabilities - Operating lease liabilities	$ 2,192	$ 2,640