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Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Additional Information (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
loan
Jun. 30, 2024
USD ($)
loan
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Derivative [Line Items]            
Outstanding derivative financial instruments $ 0 $ 0        
Number of loans repurchased | loan 0 0        
Recourse liability $ 23,000 $ 26,000 $ 23,000 $ 31,000 $ 33,000 $ 33,000
Mortgage Partnership Finance (MPF) Program            
Derivative [Line Items]            
Basis point of loss absorbed by first loss account 0.04          
Loans serviced for FHLB-SF under MPF program $ 2,900,000 3,100,000        
Recourse liability 7,000 8,000        
Other Investors | Mortgage Partnership Finance (MPF) Program            
Derivative [Line Items]            
Recourse liability $ 16,000 $ 18,000