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Fair Value of Financial Instruments - Carrying amount and fair value of the Corporations other financial instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities - held to maturity $ 103,877 $ 109,399
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for investment, not recorded at fair value 1,040,766 1,044,727
Investment securities - held to maturity 103,877 109,399
FHLB - San Francisco stock 9,568 9,568
Deposits 874,839 888,772
Borrowings 213,066 213,073
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for investment, not recorded at fair value 997,929 996,332
Investment securities - held to maturity 94,654 99,126
FHLB - San Francisco stock 9,568 9,568
Deposits 875,338 889,115
Borrowings 213,596 213,505
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for investment, not recorded at fair value 0 0
Investment securities - held to maturity 0 0
FHLB - San Francisco stock 0 0
Deposits 0 0
Borrowings 0 0
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for investment, not recorded at fair value 0 0
Investment securities - held to maturity 94,654 99,126
FHLB - San Francisco stock 9,568 9,568
Deposits 875,338 889,115
Borrowings 213,596 213,505
Fair Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for investment, not recorded at fair value 997,929 996,332
Investment securities - held to maturity 0 0
FHLB - San Francisco stock 0 0
Deposits 0 0
Borrowings $ 0 $ 0