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Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Additional Information (Details)
3 Months Ended
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Derivative [Line Items]        
Commitments to extend credit $ 4,800,000   $ 5,300,000  
Outstanding derivative financial instruments $ 0   0  
Number Of Loans Repurchased | loan 0 0    
Recourse Liability $ 200,000 $ 370,000 200,000 $ 270,000
Mortgage Partnership Finance (MPF) Program        
Derivative [Line Items]        
Basis point of loss absorbed by first loss account 4      
Other Investors        
Derivative [Line Items]        
Recourse Liability $ 175,000   175,000  
FHLB - San Francisco [Member]        
Derivative [Line Items]        
Recourse Liability $ 25,000   $ 25,000