Leases - Supplemental information (Details) - USD ($)	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Lessee, Lease, Description [Line Items]
Lease expense	$ 211,000	$ 190,000
Condensed Consolidated Statements of Condition:
Premises and equipment - Operating lease right of use assets	2,474,000		$ 2,525,000
Condensed Consolidated Statements of Operations:
Premises and occupancy expenses from operating leases	199,000	179,000
Equipment expenses from operating leases	12,000	11,000
Condensed Consolidated Statements of Cash Flows:
Operating cash flows from operating leases, net	226,000	$ 284,000
Accounts Payable and Accrued Liabilities [Member]
Condensed Consolidated Statements of Condition:
Operating lease liabilities	$ 2,573,000		$ 2,640,000