Investment Securities - Borrowings (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024
Short-Term Debt [Line Items]
Total available borrowing capacity across all sources	$ 510.7	$ 519.9
Pledged as Collateral \| Pledged to FRB
Short-Term Debt [Line Items]
Loans held for investment	174.4	178.6
Federal Home Loan Bank Advances
Short-Term Debt [Line Items]
Federal Home Loan Bank advances, unused borrowing facility	249.2	261.3
Pledged to FRB \| Discount window facility
Short-Term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	211.5	208.6
Securities held as collateral	120.8	126.6
Advances outstanding	0.0	0.0
Federal funds facility
Short-Term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50.0	$ 50.0

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

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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 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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The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities.

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