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Loans and Allowance for Credit Losses - Schedule of Loans on Nonaccrual Status (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans end of period | $ 344 | $ 1,329
Nonaccrual with no Allowance for Credit Loss | 340 | 1,213
Nonaccrual with allowance for Credit Loss | 4 | 116
Interest Income Recognized During the Period | 38 | 66
Commercial Real Estate Portfolio Segment | Real Estate - Commercial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans end of period | 329 | 359
Nonaccrual with no Allowance for Credit Loss | 329 | 359
Interest Income Recognized During the Period | 4 | 29
Commercial Real Estate Portfolio Segment | Real Estate - Residential |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans end of period | 11 | 150
Nonaccrual with no Allowance for Credit Loss | 11 | 81
Nonaccrual with allowance for Credit Loss |  | 69
Interest Income Recognized During the Period |  | 10
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans end of period |  | 13
Nonaccrual with no Allowance for Credit Loss |  | 5
Nonaccrual with allowance for Credit Loss |  | 8
Consumer Portfolio Segment | Other Consumer |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans end of period |  | 807
Nonaccrual with no Allowance for Credit Loss |  | 768
Nonaccrual with allowance for Credit Loss |  | 39
Interest Income Recognized During the Period |  | $ 27
Land Development And SIDs Portfolio Segment | Land Development and SIDs |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans end of period | 4 |
Nonaccrual with allowance for Credit Loss | 4 |
Interest Income Recognized During the Period | $ 34 |

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