Commitments and Credit Risk - Off-balance-sheet and Credit Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Unused Commitments to Extend Credit	$ 416.2	$ 317.4
Loans and Leases Receivable, Commitments, Fixed Rates	$ 94.3
weighted-average rate	4.62%
Single and Multi Family Residential Real Estate [Member]
Diversified portfolio, loans	$ 663.0
Minimum
Commitments to Originate Fixed Rate Loans Rates	2.38%
Maximum
Commitments to Originate Fixed Rate Loans Rates	5.75%