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Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Additional Information (Details)
3 Months Ended 6 Months Ended
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Derivative [Line Items]              
Outstanding derivative financial instruments $ 0   $ 0     $ 0  
Number Of Loans Repurchased | loan 0 0 0 0      
Recourse Liability $ 31,000 $ 160,000 $ 31,000 $ 160,000 $ 33,000 33,000 $ 160,000
Mortgage Partnership Finance (MPF) Program              
Derivative [Line Items]              
Basis point of loss absorbed by first loss account     0.04        
Recourse Liability 8,000   $ 8,000     8,000  
Loans Serviced for FHLB-SF under MPF Program 3,300,000   3,300,000     3,500,000  
Other Investors | Mortgage Partnership Finance (MPF) Program              
Derivative [Line Items]              
Recourse Liability $ 22,500   $ 22,500     $ 25,000