Borrowings (Details) - USD ($)	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Collateral pledged on Federal Home Loan Bank advances	$ 734,400,000	$ 861,100,000
Borrowings - Finance lease liabilities	73,000
Total borrowings	213,073,000	238,500,000
Loans held for investment	1,045,745,000	1,052,979,000
Investment securities - held to maturity, at cost with no allowance for credit losses	109,399,000	130,051,000
Purchase of FHLB - San Francisco stock		63,000
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	734,400,000	774,100,000
Federal Home Loan Bank Advances
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Federal Home Loan Bank advances, unused borrowing facility	282,300,000	261,300,000
FHLB - San Francisco advances	213,000,000	238,500,000
Borrowings - Finance lease liabilities	73,000
Federal funds facility
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Federal Home Loan Bank advances, Maximum borrowing capacity	50,000,000	50,000,000
Federal Reserve Bank of San Francisco \| Discount window facility
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Federal Home Loan Bank advances, Maximum borrowing capacity	142,500,000	208,600,000
Advances outstanding	0	0
Federal Reserve Bank of San Francisco \| Federal funds facility
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Federal Home Loan Bank advances, Maximum borrowing capacity	50,000,000	50,000,000
Advances outstanding	0	0
Federal home loan - Bank of San Francisco
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Federal Home Loan Bank advances, unused borrowing facility	282,300,000	261,300,000
FHLB - San Francisco advances	213,000,000	238,500,000
Federal Home Loan Bank advances, Maximum borrowing capacity	504,100,000	516,000,000
Federal Home Loan Bank stock, required investment	9,600,000
Federal Home Loan Bank stock, excess investment	0	0
Federal Home Loan Bank stock, cash dividends distributed	835,000	793,000
Purchase of FHLB - San Francisco stock	0	63,000
Federal home loan - Bank of San Francisco \| Letters of credit
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Outstanding letters of credit	8,500,000	16,000,000
Federal home loan - Bank of San Francisco \| MPF credit enhancement
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Advances outstanding	$ 216,000	$ 216,000
Federal home loan - Bank of 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)	40.00%	40.00%
Federal Home Loan Bank Advances \| Pledged as Collateral
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Investment securities - held to maturity, at cost with no allowance for credit losses	$ 4,700,000	$ 3,900,000
Pledged to FRB \| Pledged as Collateral
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Loans held for investment	227,000,000	178,600,000
Investment securities - held to maturity, at cost with no allowance for credit losses	24,800,000	126,600,000
Loans held for investment, current	$ 227,000,000	$ 178,600,000

Federal Home Loan Bank, Advances, Limitation on Borrowing Capacity, Percent

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Federal Home Loan Bank Stock, Cash Dividends

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Federal Home Loan Bank Stock, Excess Investment

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Federal Home Loan Bank Stock, Required Investment

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount of short-term and long-term debt and lease obligation.

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Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable classified as current. Excludes net investment in lease.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of cash outflow to acquire Federal Home Loan Bank (FHLB) stock.

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