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Investment Securities - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2024
Debt Securities, Available-for-Sale [Line Items]          
Unrealized Holding Losses 12 Months or More, Unrealized Losses $ 11,687,000   $ 11,687,000   $ 15,751,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 2,000   2,000    
Investment securities - held to maturity, allowance for credit losses 0   0   0
Impairment loss on held to maturity securities     0   0
Impairment loss on available for sale securities     0   $ 0
U.S. government sponsored enterprise MBS          
Debt Securities, Available-for-Sale [Line Items]          
Principal payments from investment securities held to maturity 5,300,000 $ 5,700,000 16,300,000 $ 18,200,000  
Proceeds from sale of investment securities available for sale 0 $ 0 0 $ 0  
U.S. Government sponsored enterprise securities          
Debt Securities, Available-for-Sale [Line Items]          
Allowance for credit losses on investment securities $ 0   $ 0