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Investment Securities - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Debt Securities, Available-for-Sale [Line Items]      
Unrealized Holding Losses 12 Months or More, Unrealized Losses $ 11,424   $ 15,751
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 1    
Investment securities - held to maturity, allowance for credit losses 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 5,700 $ 6,700  
Proceeds from sale of investment securities available for sale 0 $ 0  
U.S. Government sponsored enterprise securities      
Debt Securities, Available-for-Sale [Line Items]      
Allowance for credit losses on investment securities $ 0