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Investment Securities - Investments with Unrealized Loss Positions for Held to maturity (Details) - USD ($)
Mar. 31, 2022
Jun. 30, 2021
Schedule of Held-to-maturity Securities [Line Items]    
Unrealized Holding Losses Less Than 12 Months, Fair Value $ 128,910,000 $ 84,600,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 6,608,000 810,000
Unrealized Holding Losses 12 Months or More, Fair Value 38,467,000  
Unrealized Holding Losses 12 Months or More, Unrealized Losses 3,356,000 0
Unrealized Holding Losses Total, Fair Value 167,377,000 84,600,000
Unrealized Holding Losses Total, Unrealized Losses 9,964,000 810,000
U.S. government sponsored enterprise MBS    
Schedule of Held-to-maturity Securities [Line Items]    
Unrealized Holding Losses Less Than 12 Months, Fair Value 126,029,000 84,600,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 6,534,000 810,000
Unrealized Holding Losses 12 Months or More, Fair Value 38,467,000  
Unrealized Holding Losses 12 Months or More, Unrealized Losses 3,356,000  
Unrealized Holding Losses Total, Fair Value 164,496,000 84,600,000
Unrealized Holding Losses Total, Unrealized Losses 9,890,000 $ 810,000
U.S. government sponsored enterprise CMO    
Schedule of Held-to-maturity Securities [Line Items]    
Unrealized Holding Losses Less Than 12 Months, Fair Value 2,881,000  
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 74,000  
Unrealized Holding Losses Total, Fair Value 2,881,000  
Unrealized Holding Losses Total, Unrealized Losses $ 74,000