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Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Additional Information (Details)
3 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
loan
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Derivative [Line Items]                
Commitments to extend credit $ 5,600,000   $ 5,600,000     $ 7,400,000    
Outstanding derivative financial instruments $ 0   $ 0     0    
Number Of Loans Repurchased | loan 0 0 0 3        
Loan Repurchased, Bank       $ 1,100,000        
Amount Of Fully Charged Off Loans Repurchased $ 175,000 $ 0 $ 175,000 0        
Recourse Liability 215,000 $ 250,000 215,000 $ 250,000 $ 390,000 270,000 $ 250,000 $ 250,000
Other Investors                
Derivative [Line Items]                
Recourse Liability 175,000   175,000     200,000    
FHLB - San Francisco [Member]                
Derivative [Line Items]                
Recourse Liability $ 40,000   $ 40,000     $ 70,000