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Investment Securities - Mortgage Backed Securities Policy (Details) - USD ($)
3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items]      
Unrealized Holding Losses Total, Unrealized Losses $ 1,101,000   $ 810,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 746,000   810,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses 355,000   0
U.S. government sponsored enterprise MBS      
Schedule of Available-for-sale Securities [Line Items]      
Principal payments from investment securities available for sale 17,000,000.0 $ 9,400,000  
Proceeds from sale of investment securities available for sale 0 0  
Payments to acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity 0 $ 84,900,000  
Unrealized Holding Losses 12 Months or More, Unrealized Losses $ 355,000    
U.S. SBA securities      
Schedule of Available-for-sale Securities [Line Items]      
Unrealized Holding Losses 12 Months or More, Unrealized Losses     $ 0