Investment Securities - Mortgage Backed Securities Policy (Details)	12 Months Ended
	Jun. 30, 2021 USD ($) security	Jun. 30, 2020 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Unrealized Holding Losses Total, Unrealized Losses	$ 810,000	$ 69,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses	810,000	52,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses	0	17,000
U.S. government sponsored enterprise MBS
Schedule of Available-for-sale Securities [Line Items]
Principal payments from investment securities available for sale	52,600,000	32,100,000
Payments to acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity	158,000,000.0	55,900,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses	$ 0	$ 0
Number of Securities | security	16	2
U.S. SBA securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized Holding Losses 12 Months or More, Unrealized Losses		$ 17,000
Number of Securities | security		1
Private issue CMO
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | security		3