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Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Additional Information (Details)
3 Months Ended
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Derivative [Line Items]        
Commitments to extend credit $ 8,800,000   $ 9,700,000  
Outstanding derivative financial instruments $ 0   0  
Number Of Loans Repurchased | loan 1 3    
Debt Instrument Repurchased During Period $ 566,000 $ 253,000    
Recourse Liability 250,000 $ 250,000 250,000 $ 283,000
Other Investors        
Derivative [Line Items]        
Recourse Liability 200,000,000   200,000,000  
FHLB - San Francisco [Member]        
Derivative [Line Items]        
Recourse Liability $ 50,000,000   $ 50,000,000