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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
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INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | $ 649 | $ 418
Less than 12 months, Unrealized Losses | (6) | (3)
12 months or longer, Estimated Fair Value | 115,944 | 116,898
12 months or longer, Unrealized Losses | (14,187) | (17,519)
Total, Estimated Fair Value | 116,593 | 117,316
Total, Unrealized Losses | (14,193) | (17,522)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 169,312 | 175,392
12 months or longer, Unrealized Losses | (23,447) | (27,687)
Total, Estimated Fair Value | 169,312 | 175,392
Total, Unrealized Losses | (23,447) | (27,687)
Municipal securities |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 30,667 | 29,849
12 months or longer, Unrealized Losses | (5,081) | (6,262)
Total, Estimated Fair Value | 30,667 | 29,849
Total, Unrealized Losses | (5,081) | (6,262)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 7,791 | 7,629
12 months or longer, Unrealized Losses | (2,492) | (2,667)
Total, Estimated Fair Value | 7,791 | 7,629
Total, Unrealized Losses | (2,492) | (2,667)
Agency securities |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 30,934 | 30,203
12 months or longer, Unrealized Losses | (2,019) | (2,741)
Total, Estimated Fair Value | 30,934 | 30,203
Total, Unrealized Losses | (2,019) | (2,741)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 40,381 | 39,556
12 months or longer, Unrealized Losses | (1,948) | (2,723)
Total, Estimated Fair Value | 40,381 | 39,556
Total, Unrealized Losses | (1,948) | (2,723)
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 22,890 | 23,490
12 months or longer, Unrealized Losses | (4,396) | (5,107)
Total, Estimated Fair Value | 22,890 | 23,490
Total, Unrealized Losses | (4,396) | (5,107)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 23,276 | 24,268
12 months or longer, Unrealized Losses | (3,552) | (4,231)
Total, Estimated Fair Value | 23,276 | 24,268
Total, Unrealized Losses | (3,552) | (4,231)
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 8,580 | 9,540
12 months or longer, Unrealized Losses | (436) | (589)
Total, Estimated Fair Value | 8,580 | 9,540
Total, Unrealized Losses | (436) | (589)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 83,070 | 86,485
12 months or longer, Unrealized Losses | (13,252) | (15,448)
Total, Estimated Fair Value | 83,070 | 86,485
Total, Unrealized Losses | (13,252) | (15,448)
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 649 | 418
Less than 12 months, Unrealized Losses | (6) | (3)
12 months or longer, Estimated Fair Value | 22,873 | 23,816
12 months or longer, Unrealized Losses | (2,255) | (2,820)
Total, Estimated Fair Value | 23,522 | 24,234
Total, Unrealized Losses | (2,261) | (2,823)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 14,794 | 17,454
12 months or longer, Unrealized Losses | (2,203) | (2,618)
Total, Estimated Fair Value | 14,794 | 17,454
Total, Unrealized Losses | $ (2,203) | $ (2,618)

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