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Investment Securities - Mortgage Backed Securities Policy (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items]          
Unrealized Holding Losses Total, Unrealized Losses $ 9,964,000   $ 9,964,000   $ 810,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 6,608,000   6,608,000   810,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses 3,356,000   3,356,000   $ 0
U.S. government sponsored enterprise MBS          
Schedule of Available-for-sale Securities [Line Items]          
Principal payments from investment securities available for sale 12,300,000 $ 15,000,000.0 44,800,000 $ 36,800,000  
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   $ 51,600,000 15,200,000 $ 158,000,000.0  
Unrealized Holding Losses 12 Months or More, Unrealized Losses $ 3,356,000   $ 3,356,000