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Investment Securities - Investments with Unrealized Loss Positions for total investment securities (Details) - USD ($)
Mar. 31, 2021
Jun. 30, 2020
Investment Securities    
Unrealized Holding Losses Less Than 12 Months, Fair Value $ 158,588,000 $ 12,928,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 1,972,000 52,000
Unrealized Holding Losses 12 Months or More, Fair Value 1,860,000 2,040,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses 17,000 17,000
Unrealized Holding Losses Total, Fair Value 160,448,000 14,968,000
Unrealized Holding Losses Total, Unrealized Losses $ 1,989,000 $ 69,000