Fair Value of Assets and Liabilities - Level 3 (Details) |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Dec. 31, 2025
USD ($)
security
|
Sep. 30, 2025
USD ($)
|
Dec. 31, 2024
USD ($)
|
Sep. 30, 2024
USD ($)
|
Dec. 31, 2025
USD ($)
security
|
Jun. 30, 2025
security
|
|
| Fair Value of Assets and Liabilities | ||||||
| Beginning balance | $ 1,660,000 | $ 1,610,000 | $ 1,500,000 | $ 1,460,000 | $ 1,610,000 | |
| Unrealized gains included in other comprehensive income | $ 25,000 | $ 50,000 | 0 | $ 40,000 | ||
| 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 | OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | |||
| Ending balance | $ 1,685,000 | $ 1,660,000 | $ 1,500,000 | $ 1,500,000 | $ 1,685,000 | |
| Number of investment securities measured at fair value on a recurring basis using significant unobservable inputs | security | 1 | 1 | 1 | |||
| Significant unobservable input | The Level 3 valuation is based on the 5/30 swap curve | |||||
| Significant unobservable input, float | 1.00% | 1.00% | ||||