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Fair Value, Assets Measured on Recurring Basis, Valuation Techniques (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($)
--- | --- | --- | --- | ---
Valuation Technique, Discounted Cash Flow |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Mortgage servicing rights | $ 0 | $ 130 |  |
Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Mortgage servicing rights | 0 | 130 |  |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Mortgage servicing rights | 0 | 130 |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Mortgage servicing rights | 0 | 130 |  |
Fair Value, Measurements, Recurring | Other Assets | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 0 | $ 130 | $ 131 | $ 140
Measurement Input, Constant Prepayment Rate | Fair Value, Measurements, Recurring | Other Assets | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Servicing Asset, Measurement Input |  | 0.064 |  |

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