Loans and Allowance for Credit Losses for Loans - Past Due, Non-Accrual and Current Loans by Loan Portfolio Class. (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 278,878	$ 327,130
Current Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	272,518	327,035
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	906	0
90 Days or More Past Due Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,454	95
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	135,968	75,699
Commercial and industrial \| Current Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	135,968	75,699
Commercial and industrial \| 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Commercial and industrial \| 90 Days or More Past Due Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Commercial Real Estate \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	139,450	250,109
Commercial Real Estate \| Current Loans \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	133,996	250,109
Commercial Real Estate \| 30-89 Days Past Due \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Commercial Real Estate \| 90 Days or More Past Due Loans \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,454	0
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,434	1,282
Residential mortgage \| Current Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,528	1,187
Residential mortgage \| 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	906	0
Residential mortgage \| 90 Days or More Past Due Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	95
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	26	40
Home equity \| Current Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	26	40
Home equity \| 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Home equity \| 90 Days or More Past Due Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0	$ 0