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Fair Value of Assets and Liabilities - Level 3 (Details)
 12 Months Ended
Jun. 30, 2024
USD ($)
security
Jun. 30, 2023
USD ($)
security
Fair Value of Assets and Liabilities    
Beginning balance $ 1,580,000 $ 1,900,000
Unrealized losses included in other comprehensive income (loss) $ (120,000) $ (320,000)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax
Ending balance $ 1,460,000 $ 1,580,000
Number of investment securities measured at fair value on a recurring basis using significant unobservable inputs | security 1 1
Significant unobservable input The Level 3 valuation is based on the 5/30 swap curve  
Significant unobservable input, float 1.00%