Borrowings (Details) - USD ($)	12 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Collateral pledged on Federal Home Loan Bank advances	$ 967,600,000	$ 570,400,000
Purchase of FHLB - San Francisco stock	1,266,000	84,000
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	287,900,000	310,300,000
Advances from Federal Home Loan Banks	235,009,000	85,000,000
Federal Reserve Bank Advances \| Discount Window Facility
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Line of Credit Facility, Maximum Borrowing Capacity	139,000,000.0	153,900,000
Advances outstanding	0	0
Federal Funds Purchased
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Line of Credit Facility, Maximum Borrowing Capacity	50,000,000.0	50,000,000.0
Advances outstanding	0	0
Federal Reserve Bank of San Francisco \| Discount Window Facility
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Line of Credit Facility, Maximum Borrowing Capacity	139,000,000.0	153,900,000
Advances outstanding	0	0
Federal Reserve Bank of San Francisco \| Federal Funds Purchased
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Line of Credit Facility, Maximum Borrowing Capacity	50,000,000.0	50,000,000.0
Advances outstanding	0
FHLB - San Francisco
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Federal Home Loan Bank advances, unused borrowing facility	287,900,000	310,300,000
Advances from Federal Home Loan Banks	235,000,000.0	85,000,000.0
Line of Credit Facility, Maximum Borrowing Capacity	534,100,000	415,700,000
Federal Home Loan Bank stock, required investment	9,500,000	8,200,000
Federal Home Loan Bank stock, excess investment	0	0
Federal Home Loan Bank stock, cash dividends distributed	556,000	489,000
Federal Home Loan Bank stock, redeemed amount	0	0
Purchase of FHLB - San Francisco stock	1,300,000	84,000
FHLB - San Francisco \| Letter of Credit
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Outstanding letters of credit	11,000,000.0	18,000,000.0
FHLB - San Francisco \| MPF Credit Enhancement
Discount window facility is with FHLB and Federal Reserve Bank of San Francisco
Advances outstanding	$ 216,000	$ 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)	40.00%	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	$ 967,600,000	$ 570,400,000
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	$ 4,200,000	$ 4,700,000

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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Redeemed amount of federal home loan bank stock.

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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 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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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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