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Fair Value of Financial Instruments - Summary Of Carrying Amounts And Estimated Fair Values By Fair Value Hierarchy Of Certain Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Carrying Amount |  |
Financial assets: |  |
Loans, net | $ 416,797 | $ 396,756
Financial liabilities: |  |
Interest-bearing deposits | 344,210 | 351,704
Estimated Fair Value |  |
Financial assets: |  |
Loans, net | 404,325 | 380,967
Financial liabilities: |  |
Interest-bearing deposits | 306,371 | 308,114
Level 2 |  |
Financial liabilities: |  |
Interest-bearing deposits | 306,371 | 308,114
Level 3 |  |
Financial assets: |  |
Loans, net | $ 404,325 | $ 380,967

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