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Investment Securities - Summary of Debt Securities Available for Sale and Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Estimated Fair Value |  |
Less than 12 Months | $ 2,666 | $ 6,028
12 Months or Greater | 31,554 | 33,693
Total | 34,220 | 39,721
Unrealized Losses |  |
Less than 12 Months | (9) | (64)
12 Months or Greater | (4,046) | (4,911)
Total | (4,055) | (4,975)
FHLMC Bonds |  |
Estimated Fair Value |  |
Less than 12 Months | 1,792 | 2,919
12 Months or Greater | 12,310 | 12,978
Total | 14,102 | 15,897
Unrealized Losses |  |
Less than 12 Months | (6) | (39)
12 Months or Greater | (1,383) | (1,687)
Total | (1,389) | (1,726)
GNMA Bonds |  |
Estimated Fair Value |  |
Less than 12 Months |  | 105
12 Months or Greater |  | 1,154
Total |  | 1,259
Unrealized Losses |  |
Less than 12 Months |  | (1)
12 Months or Greater |  | (1)
Total |  | (2)
FNMA Bonds |  |
Estimated Fair Value |  |
Less than 12 Months | 874 | 3,004
12 Months or Greater | 11,746 | 12,315
Total | 12,620 | 15,319
Unrealized Losses |  |
Less than 12 Months | (3) | (24)
12 Months or Greater | (1,540) | (1,847)
Total | (1,543) | (1,871)
Municipal Bonds |  |
Estimated Fair Value |  |
12 Months or Greater | 7,498 | 7,246
Total | 7,498 | 7,246
Unrealized Losses |  |
12 Months or Greater | (1,123) | (1,376)
Total | $ (1,123) | $ (1,376)

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