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Investment Securities (Tables) | 6 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Summary of Investment Securities Available for Sale and Held to Maturity | The following is a summary of investment securities at September 30, 2025 and March 31, 2025:
|  | September 30, 2025 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Securities available-for-sale |  | (Dollars in thousands) |
FHLMC bonds |  | $ | 23,604 |  |  | $ | 166 |  |  | $ | (1,389 | ) |  | $ | 22,381 |
GNMA bonds |  |  | 4,746 |  |  |  | 43 |  |  |  | — |  |  |  | 4,789 |
FNMA bonds |  |  | 26,230 |  |  |  | 315 |  |  |  | (1,543 | ) |  |  | 25,002 |
Municipal bonds |  |  | 8,621 |  |  |  | — |  |  |  | (1,123 | ) |  |  | 7,498 |
Total securities available-for-sale |  | $ | 63,201 |  |  | $ | 524 |  |  | $ | (4,055 | ) |  | $ | 59,670 |
Securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |
FHLMC bonds |  | $ | 58 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 59 |
GNMA bonds |  |  | 38 |  |  |  | 1 |  |  |  | — |  |  |  | 39 |
FNMA bonds |  |  | 96 |  |  |  | 2 |  |  |  | — |  |  |  | 98 |
Total securities held-to-maturity |  | $ | 192 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 196 |
(dollars in thousands) |  | March 31, 2025 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Securities available-for-sale |  | (Dollars in thousands) |
FHLMC bonds |  | $ | 23,085 |  |  | $ | 107 |  |  | $ | (1,726 | ) |  | $ | 21,466 |
GNMA bonds |  |  | 5,035 |  |  |  | 34 |  |  |  | (2 | ) |  |  | 5,067 |
FNMA bonds |  |  | 27,237 |  |  |  | 224 |  |  |  | (1,871 | ) |  |  | 25,590 |
Municipal bonds |  |  | 8,622 |  |  |  | — |  |  |  | (1,376 | ) |  |  | 7,246 |
Total securities available-for-sale |  | $ | 63,979 |  |  | $ | 365 |  |  | $ | (4,975 | ) |  | $ | 59,369 |
Securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |
FHLMC bonds |  | $ | 64 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 66 |
GNMA bonds |  |  | 46 |  |  |  | — |  |  |  | — |  |  |  | 46 |
FNMA bonds |  |  | 112 |  |  |  | 2 |  |  |  | — |  |  |  | 114 |
Total securities held-to-maturity |  | $ | 222 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 226 |
Summary of Debt Securities Available for Sale and Unrealized Loss Position | The fair value and gross unrealized losses on the Association’s available-for-sale investment securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2025 and March 31, 2025, are as follows:
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
September 30, 2025 |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
Securities available-for-sale |  | (Dollars in thousands) |
FHLMC bonds |  | $ | 1,792 |  |  | $ | (6 | ) |  | $ | 12,310 |  |  | $ | (1,383 | ) |  | $ | 14,102 |  |  | $ | (1,389 | )
FNMA bonds |  |  | 874 |  |  |  | (3 | ) |  |  | 11,746 |  |  |  | (1,540 | ) |  |  | 12,620 |  |  |  | (1,543 | )
Municipal bonds |  |  | — |  |  |  | — |  |  |  | 7,498 |  |  |  | (1,123 | ) |  |  | 7,498 |  |  |  | (1,123 | )
Total securities available-for-sale |  | $ | 2,666 |  |  | $ | (9 | ) |  | $ | 31,554 |  |  | $ | (4,046 | ) |  | $ | 34,220 |  |  | $ | (4,055 | )
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
March 31, 2025 |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
Securities available-for-sale |  | (Dollars in thousands) |
FHLMC bonds |  | $ | 2,919 |  |  | $ | (39 | ) |  | $ | 12,978 |  |  | $ | (1,687 | ) |  | $ | 15,897 |  |  | $ | (1,726 | )
GNMA bonds |  |  | 105 |  |  |  | (1 | ) |  |  | 1,154 |  |  |  | (1 | ) |  |  | 1,259 |  |  |  | (2 | )
FNMA bonds |  |  | 3,004 |  |  |  | (24 | ) |  |  | 12,315 |  |  |  | (1,847 | ) |  |  | 15,319 |  |  |  | (1,871 | )
Municipal bonds |  |  | — |  |  |  | — |  |  |  | 7,246 |  |  |  | (1,376 | ) |  |  | 7,246 |  |  |  | (1,376 | )
Total securities available-for-sale |  | $ | 6,028 |  |  | $ | (64 | ) |  | $ | 33,693 |  |  | $ | (4,911 | ) |  | $ | 39,721 |  |  | $ | (4,975 | )
Schedule of Amortized Cost and Fair Value of Available for sale Investment Securities by Contractual Maturity | The amortized cost and fair values of available for sale investment securities as of September 30, 2025 by contractual maturity, are shown below:
|  | Available for Sale |
|  | Amortized Cost |  |  | Fair Value |
Maturity |  | (Dollars in thousands) |
Due less than one year |  | $ | — |  |  | $ | — |
Due after one year through five years |  |  | 3,012 |  |  |  | 2,932 |
Due after five years through ten years |  |  | 2,602 |  |  |  | 2,195 |
Due after ten years |  |  | 3,007 |  |  |  | 2,371 |
Mortgage-backed securities and collateralized mortgage obligations |  |  | 54,580 |  |  |  | 52,172 |
Total |  | $ | 63,201 |  |  | $ | 59,670 |

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