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Investment Securities - Investments with Unrealized Loss Positions for total investment securities (Details) - USD ($)
Mar. 31, 2025
Jun. 30, 2024
Investment Securities    
Unrealized Holding Losses Less Than 12 Months, Fair Value $ 363,000 $ 546,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 2,000  
Unrealized Holding Losses 12 Months or More, Fair Value 97,490,000 110,203,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses 11,687,000 15,751,000
Unrealized Holding Losses Total, Fair Value 97,853,000 110,749,000
Unrealized Holding Losses Total, Unrealized Losses $ 11,689,000 $ 15,751,000