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Defined Pension Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost (benefit) | $ 0 | $ 191 | $ 0 | $ 386 |
Proceeds from sales of investment securities available-for-sale | 30,100 | 25,000 | 53,134 | 24,985 |
Available-for-sale securities, gross realized gains | 0 | 0 | 0 | 0 |
Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost (benefit) | 0 | 191 | 0 | 386 |
Supplemental Employee Retirement Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost (benefit) | $ 112 | $ 112 | $ 225 | $ 225 | $ 450

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