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Investment Securities - Mortgage Backed Securities Policy (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items]          
Unrealized Holding Losses Total, Unrealized Losses $ 1,778,000   $ 1,778,000   $ 810,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 1,411,000   1,411,000   810,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses 367,000   367,000   0
U.S. government sponsored enterprise MBS          
Schedule of Available-for-sale Securities [Line Items]          
Principal payments from investment securities available for sale 15,500,000 $ 12,400,000 32,500,000 $ 21,800,000  
Proceeds from sale of investment securities available for sale 0 0 0 0  
Payments to acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity 15,000,000.0 $ 21,500,000 15,000,000.0 $ 106,400,000  
Unrealized Holding Losses 12 Months or More, Unrealized Losses $ 367,000   $ 367,000    
U.S. SBA securities          
Schedule of Available-for-sale Securities [Line Items]          
Unrealized Holding Losses 12 Months or More, Unrealized Losses         $ 0