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Investment Securities - Mortgage Backed Securities Policy (Details) - USD ($)
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Schedule of Available-for-sale Securities [Line Items]    
Unrealized Holding Losses Total, Unrealized Losses $ 69,000 $ 21,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 52,000 9,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses 17,000 12,000
U.S. government sponsored enterprise MBS    
Schedule of Available-for-sale Securities [Line Items]    
Principal payments from investment securities available for sale 32,100,000 34,200,000
Payments to acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity 55,900,000 39,900,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses $ 0 $ 6,000