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Borrowings (Details) - USD ($)
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco    
Collateral pledged on Federal Home Loan Bank advances $ 570,400,000 $ 607,000,000.0
Federal Home Loan Bank stock, cash dividends distributed 489,000 418,000
Advances, Federal Funds Facility with Correspondent Bank 50,000,000.0 17,000,000.0
Federal Home Loan Bank stock, redeemed amount 0 0
Purchase of FHLB - San Francisco stock 84,000 185,000
Discount Window Facility [Member]    
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco    
Federal Reserve Bank of San Francisco 0 0
San Francisco [Member]    
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco    
Federal Home Loan Bank advances, limit on borrowing capacity, amount 415,700,000 416,200,000
Federal Home Loan Bank advances, unused borrowing facility 310,300,000 296,800,000
Federal Home Loan Bank advances, available collateral 310,500,000 343,100,000
Federal Reserve Bank of San Francisco 85,000,000 100,983,000
Outstanding letters of credit 18,000,000.0 16,000,000.0
Federal Home Loan Bank stock, required investment 8,200,000 8,200,000
Federal Home Loan Bank stock, excess investment 0 0
Federal Reserve Bank of San Francisco    
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco    
Purchase of FHLB - San Francisco stock 84,000 185,000
Federal Reserve Bank of San Francisco | Discount Window Facility [Member]    
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco    
Federal Reserve Bank of San Francisco 153,900,000 206,100,000
FHLB - San Francisco | MPF Credit Enhancement [Member]    
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco    
MPF credit enhancement $ 2,500,000 $ 2,500,000
FHLB - San Francisco | Maximum    
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco    
Federal Home Loan Bank advances, limit on borrowing capacity (percent of total assets) 35.00% 35.00%
FHLB - San Francisco | Mortgage Loans on Real Estate.    
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco    
Collateral pledged on Federal Home Loan Bank advances $ 570,400,000 $ 607,000,000.0
FHLB - San Francisco | Investment Securities [Member]    
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco    
Collateral pledged on Federal Home Loan Bank advances 4,700,000 1,600,000
FHLB - San Francisco | Investment Securities [Member] | Discount Window Facility [Member]    
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco    
Collateral pledged on Federal Home Loan Bank advances $ 163,700,000 $ 219,200,000