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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, 2019
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Derivative [Line Items]              
Commitments to extend credit $ 8,300,000 $ 8,300,000     $ 9,700,000    
Outstanding derivative financial instruments $ 0 $ 0     0    
Number Of Loans Repurchased | loan 2 3 3        
Debt Instrument Repurchased During Period $ 520,000   $ 253,000        
Recourse Liability 250,000 $ 250,000 250,000 $ 250,000 250,000 $ 250,000 $ 283,000
Amount Of Fully Charged Off Loans Repurchased     $ 25,000        
Debt Instrument, Repurchase Amount 1,100,000 1,100,000          
Number Of Fully Charged Off Loans Repurchased | loan     2        
Other Investors              
Derivative [Line Items]              
Recourse Liability 200,000 200,000     200,000    
FHLB - San Francisco [Member]              
Derivative [Line Items]              
Recourse Liability $ 50,000 $ 50,000     $ 50,000