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Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Additional Information (Details)
6 Months Ended
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Derivative [Line Items]            
Commitments to extend credit $ 4,500,000     $ 5,300,000    
Outstanding derivative financial instruments $ 0     0    
Number Of Loans Repurchased | loan 0 0        
Recourse Liability $ 160,000 $ 390,000 $ 200,000 200,000 $ 370,000 $ 270,000
Mortgage Partnership Finance (MPF) Program            
Derivative [Line Items]            
Basis point of loss absorbed by first loss account 4          
Other Investors | Mortgage Partnership Finance (MPF) Program            
Derivative [Line Items]            
Recourse Liability $ 150,000     175,000    
FHLB - San Francisco [Member]            
Derivative [Line Items]            
Recourse Liability $ 10,500     $ 25,000